Strawberries contain about 15 wt% solids and 85 wt% water. To make strawberry jam, crushed strawberries and sugar are mixed in a 45:55 mass ratio, and the mixture is heated to evaporate water until the residue contains one-third water by mass.
a) Draw and label a flowchart of this process.
b) Do the degree-of-freedom analysis and show that the system has zero degrees of freedom (i.e., the number of unknown process variables equals the number of equations relating them). If you have too many unknowns, think about what you might have forgotten to do.
c) Calculate how many pounds of strawberries are needed to make a pound of jam.
d) Making a pound of jam is something you could accomplish in your own kitchen (or maybe even a dorm room). However, a typical manufacturing line for jam might produce 1500 \mathrm{lb}_{\mathrm{m}} / \mathrm{h}. List technical and economic factors you would have to take into account as you scaled up this process from your kitchen to a commercial operation.
Answers
Answer:
A. The flow diagram is in the attachment
B. Degree of freedom = 0
C. 0.486
D. Energy, power, cost of production
Explanation:
1/3 of water = 0.3333
Sugar = 1-1/3 = 2/3
B.) 45/55 = 9/11 when divided by 5
m1/m2 = 9/11
Cross multiply and make m1 subject of the formula
m1/m2 = 0.818
m1 = 0.818m2 ----1
0.15m1 + m2 = 1 x 0.667
0.15m1 + m2 = 0.667
0.15(0.818m2) = 0.667
1.1227m2 = 0.667
M2 = 0.5941
We put value of m2 in equation 1
M1 = 0.818 x 0.5941
M1 = 0.486
So 0.486 pound of strawberry is what we need in order to make 1 pound of jam.
D. We need great heat for water evaporation
The technical and economic factors would be
1. Energy which is power consumption
2. Cost of production for equipments and materials
3. Power
4. And hazards
Related Questions
A gas has a temperature of 400. K, a pressure of 50.0 kPa, and a volume of 3.00 L. The volume is doubled while the temperature is held con- stant, and then the temperature is halved while the pressure is held constant. Use the gas laws to deter- mine the final temperature, pres- sure, and volume of the gas.
Answers
The, new volume is 1200 L and new pressure is 25 kPa.
Given, temperature = 400 K
Pressure = 50 kPa
Volume = 3 L
V1/T1 = V2/T2
V2 = V1×T2 / T1
V2 = 400× 6/ 2
V2 = 1200 L
Hence, new volume is 1200 L.
P1/T1 = P2/T2
P2 = P1 × T2/ T1
P2 = 50 × 1000 × 200/ 400
P2 = 25000 Pa
Hence, new pressure is 25 kPa.
A gas is a set of molecules that do not cohere strongly sufficient to form a liquid or a strong. The quantity of a gas is, so long as the molecules fit into it, the extent of the container preserving the gas. In different phrases, the extent of a gas isn't always a belongings of the gas immediately, however a belongings of the box.
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hen the following molecular equation is balanced using the smallest possible integer coefficients, the values of these coefficients are: hydrochloric acid (aq) iron(iii) oxide (s) water (l) iron(iii) chloride (aq
Answers
The coefficients for the above given reaction,
hydrochloric acid (aq) + iron(iii) oxide → (s) water (l) + iron(iii) chloride are 6) 1) 3) 2).
Balanced chemical equations are described as the chemical equations that have the same number and type of each atom on both sides of the equation. The coefficients of a balanced chemical equation must be the simplest whole number ratio. Mass of the chemicals is always conserved in chemical reactions.
Word reaction for the above chemical reaction is given as,
hydrochloric acid (aq) + iron(iii) oxide → (s) water (l) + iron(iii) chloride
Balanced chemical for the reaction is given as,
6 HCl + Fe₂O₃ → 3H₂O + 2FeCl₃
Hence, the coefficients are 6) 1) 3) 2).
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We must __________ forces to calculate net force if the forces are going in OPPOSITE directions.
options:
add
or
subtract
Answers
Answer:
subtract
Explanation:
To find the net force of two bodies going in opposite directions, we must subtract the forces this is because they are not additive forces.
The net force is the resultant force acting on a body. This resultant force is the single force that will produce the same effects as all given forces. When forces are directed oppositely on a body, they are subtracted from each other to find the net force.PLEASE HELP!!!
How many calories are in 4,180 joules?
Answers
Answer:
To convert joules to calories, you can use the conversion factor:
1 calorie = 4.184 joules
To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:
4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)
Therefore, there are approximately 0.9 calories in 4,180 joules.
The blood pH is regulated by the following equations: CO2(g) + H2O(l) ↔ H2CO3(aq) ↔ H2CO3(aq) + H2O(l) ↔ HCO3- (aq) + H3O+(aq) [Equation A]
Using Le Chatelier’s principle, which direction will the reaction shifts if there is an increase in H3O+ when the blood becomes more acidic with increasing cellular metabolism.
How will the pH of the blood be affected if a person is hyperventilating?
An emergency medical team evaluates an Olympic athlete and determines that she has alkalosis (high blood pH). What does this mean in terms of the ratio of bicarbonate to carbonic acid? Which way would the reactions have to shift to lower her blood pH?
Answers
The blood pH would turn more alkaline
There is more bicarbonate ions in the blood
The equilibrium would have to shift to the left
How will the pH of the blood be affected if a person is hyperventilating?Hyperventilation is a condition in which a person breathes rapidly and deeply, leading to a decrease in the concentration of carbon dioxide (CO2) in the blood. This causes a shift in the balance of the carbonic acid-bicarbonate buffer system in the blood, which can affect the pH of the blood.
The carbonic acid-bicarbonate buffer system is an important mechanism that helps regulate the pH of the blood. It involves the equilibrium between carbonic acid (H2CO3) and bicarbonate ions (HCO3-) in the blood:
H2CO3 ⇌ H+ + HCO3-
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What happens at the cathode?
O A. Metal ions are oxidized.
O B. Metal ions are released into solution.
O C. Metal ions donate electrons.
O D. Metal ions form solid metal.
Answers
Metal ions form solid metal is the correct statement about what happens at the cathode.
Option D is correct.
What is the cathode?The electrode from which a regular current exit a polarized electrical device is referred to as the cathode.
Reduction occurs at the cathode, and oxidation occurs at the anode. These processes are taking place on metal surfaces, or electrodes, thanks to electrochemistry.
Anode and cathode, respectively, have the symbols A and K.
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Where are most of the state’s wind farms located? Why do you think this is?
Answers
A wind farm can also be located offshore in most of the state.
Why in most of the state wind frames are located in offshore?
Offshore, faster wind speeds allow for substantially greater energy production. The term "offshore wind energy" describes the installation of wind farms inside of bodies of water. To produce electricity, they use the sea winds. These wind farms may employ floating wind turbines or turbines with solid foundations. Also, compared to other renewable technologies, offshore wind is more similar to onshore wind in terms of resource accessibility and technological maturity. Offshore wind farms are starting to blend into the water and coastal environment as a result.
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Your little sister asks you a scientific question: "Does chocolate milk come from brown cows?" In order to answer the question, you decide to form a hypothesis.
Explain whether or not the following statements are effective hypotheses.
i. Brown cows produce chocolate milk.
ii. Brown cows never produce chocolate milk.
iii. Brown cows produce white milk.
Answers
A hypothesis is a proposed explanation or prediction based on limited evidence or observations, which can be tested through further investigation or experimentation. It should be specific, testable, and based on existing knowledge.
Now, let's evaluate each statement as a hypothesis:Brown cows produce chocolate milk.This statement can be considered an effective hypothesis as it proposes a relationship between the color of cows and the color of milk they produce. It is specific and testable, as one could observe and analyze the milk produced by brown cows to see if it is indeed chocolate milk. However, based on existing knowledge, we can confidently say that this hypothesis is not accurate, as the color of a cow does not determine the color of the milk it produces.Brown cows never produce chocolate milk.This statement can also be considered an effective hypothesis because it makes a specific claim that can be tested. However, based on existing knowledge, we can say that this hypothesis is not accurate. While the color of a cow does not determine the color of the milk, it is possible for chocolate milk to be produced by adding chocolate syrup or cocoa powder to regular white milk.Brown cows produce white milk.This statement is not an effective hypothesis as it is a general statement that aligns with existing knowledge. It does not propose any specific relationship or prediction to be tested. In the context of this question, the statement is not accurate as milk produced by cows is typically white, regardless of their coat color.For such more question on hypothesis
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Why is there no isotactic or syndiotactic form ofpolyethylene?
Answers
Answer: There is no isotactic or syndiotactic form of polyethylene.
Explanation: Polyethylene is a type of polymer that is made up of repeating units of ethylene monomers. The polymer chains in polyethylene are arranged randomly, without any specific stereochemistry, which means that there is no isotactic or syndiotactic arrangement of the polymer chains. The lack of stereochemistry in polyethylene results in a material that is amorphous and has low crystallinity, which gives it unique mechanical and physical properties that make it useful for a wide range of applications.
A chemical property can be identified _____ changing the composition of a substance. with and without. without. with or without. only by
Answers
D) only by changing the composition of a substance, a chemical property can be identified.
What constitutes as a chemical property?An characteristic of a specific material that can be observed during a chemical reaction is called a chemical property. Main chemical properties include chemical stability, flammability, toxicity, heat of combustion, pH value, and rates of radioactive decay.
How can you determine what a substance is made of?The arrangement, ratio, and kind of atoms in chemical substance molecules are referred to as chemical composition. The molar mass of a mixture can be utilized to identify some of its chemical components. You can always just write down the chemical formulae and then multiply the atomic weight of each element by the amount of atoms that comprise each molecule. You can then verify the molar mass you get as a result with the sample's actual mass.
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A chemical property can be identified _____ changing the composition of a substance.
A)with and without.
B)without.
C)with or without.
D)only by
Question 1
This diagram shows Earth in four different positions during its yearly orbit around the sun. Which of the following accurately describes the position of the United States during the summer months?
Question 2
The diagram models 4 lunar phases. During which one is the tide the highest?
Question 3
An HR Diagram is shown below. A star that has a luminosity of 10^-2 is likely a…
Question 4
Earth's atmosphere blocks short wavelengths of the electromagnetic spectrum. Which telescopes DO NOT need to be placed in orbit around Earth to observe short-length radiation?
Question 5
A student models the relationship between the Earth and the Sun using string and a ball. Which of the following explains the relationship demonstrated?
Answers
Answer 1:
During the summer months in the northern hemisphere (where the United States is located), Earth is in position C, which is when the northern hemisphere is tilted towards the sun.
Answer 2:
The highest tide occurs during the full moon phase, which is represented by position C in the diagram.
Answer 3:
A star that has a luminosity of 10^-2 is likely a red dwarf.
Answer 4:
Telescopes that observe short-wavelength radiation, such as X-rays and gamma rays, do not need to be placed in orbit around Earth because these wavelengths are absorbed by the atmosphere. Therefore, telescopes that observe these wavelengths are typically placed in space, outside of Earth's atmosphere.
Answer 5:
The student is likely demonstrating the relationship between the Earth and the Sun's gravitational pull. The ball represents the Sun, and the string represents the gravitational force pulling the Earth towards the Sun. The demonstration shows how the Earth orbits the Sun due to this gravitational force.
What is gravitational force?Gravitational force is described as a force that exists between any two objects in the universe that have mass.
It is the force that causes objects with mass to be attracted to each other. The magnitude of the gravitational force between two objects depends on their masses and the distance between them.
Along with the electromagnetic force, the strong nuclear force, and the weak nuclear force, gravity is one of the four fundamental forces of the universe.
Sir Isaac Newton initially introduced it in his law of universal gravitation, and Albert Einstein later elaborated on it in his theory of general relativity.
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What percent of the compound is made of Silver? *
Silver Nitrate, AgNO3?
Answers
Approximately 63.5% of the compound AgNO3 is made of silver.
The atomic mass of silver (Ag) is 107.87 g/mol, and the atomic mass of nitrogen (N) is 14.01 g/mol, and the atomic mass of oxygen (O) is 16.00 g/mol.
The molecular weight of AgNO3 is:
AgNO3 = (Ag atomic mass) + (N atomic mass) + (3 x O atomic mass)
AgNO3 = (107.87 g/mol) + (14.01 g/mol) + (3 x 16.00 g/mol)
AgNO3 = 169.87 g/mol
The percent by mass of silver in AgNO3 can be calculated as:
Percent by mass of silver = (Mass of silver / Total mass of AgNO3) x 100
Since there is only one silver atom in one AgNO3 molecule, the mass of silver in one mole of AgNO3 is equal to the atomic mass of silver, which is 107.87 g/mol.
Therefore, the percent by mass of silver in AgNO3 is:
Percent by mass of silver = (107.87 g/mol / 169.87 g/mol) x 100
Percent by mass of silver = 63.5%
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If 2.68 g of benzaldehyde are involved with the mixed aldol condensation reaction, how many moles of benzaldehyde are present? Round your answer to the correct number of significant figures. (reaction has 2:1 mole ratio) 1 acetone is reacted with 2 benzaldehyde
Answers
Answer:
The number of moles of benzaldehyde = 0.0253 moles
Explanation:
The molecular formula of benzaldehyde is C₇H₆O
Its molecular mass is calculated from the atomic masses of the constituent atoms.
C = 12.0 g: H = 1.0 g; O = 16.0 g
Molecular mass = ( 12 * 7) + (1 * 6) + (16 * 1) = 106.0 g/mol
Number of moles of substance = mass of substance/ molar mass of the substance
mass of benzaldehyde = 2.68; molar mass = 106.0 g/mol
Number of moles of benzaldehyde = 2.68 g/ 106 g/mol = 0.0253 moles
Therefore, the number of moles of benzaldehyde = 0.0253 moles
The Sun has been shining on this swimming pool all day. The water is much warmer than it was in the morning. Describe what is happening to the water in terms of temperature, particle speed, and kinetic energy.
Answers
Answer:
The waters' temp increased
Explanation:
The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.
True or False: All temperatures used in the comparisons or calculations of gases must use the Kelvin temperature scale.
Answers
Answer:
True
Explanation:
I used my notes from class today. I could be wrong.
Researchers investigated the influence of environmental pH on the activity of peroxidase, an enzyme that catalyzes the conversion of hydrogen peroxide to water and oxygen gas. In an experiment, the researchers added a hydrogen peroxide solution containing guaiacol to several identical test tubes and adjusted the solution in each test tube to a different pH . The researchers included the guaiacol because it caused the solutions to change color as the reactions proceeded, which the researchers relied on for measuring reaction rates. Finally, the researchers added the same amount of peroxidase to each test tube and measured the rate of each reaction at 23°C . The results of the experiment are represented in Figure 1.
Based on Figure 1, which of the following statements best predicts the effect that a change from a moderately acidic environment ( pH near 6) to a basic environment will have on peroxidase activity?
answer choices
Peroxidase activity will decrease.
Peroxidase activity will increase.
Peroxidase activity will stay the same.
Peroxidase activity will increase at first and then decrease.
Answers
From the given graph, if we change from a moderately acidic environment ( pH near 6) to a basic environment, the peroxidase activity will decrease. Therefore, option (A) is correct.
What is pH?pH can be described as the negative logarithm of hydrogen ion (H⁺) concentration. Mathematically, pH is generally inversely proportional to the concentration of hydrogen ions (H⁺).
pH = -log ([H⁺])
In chemistry, pH is a scale used to determine the acidity or basicity of an aqueous solution. Acidic solutions are calculated to have lower pH values than basic or alkaline solutions.
The pH scale possesses ranges from 0 to 14 while pH 7.0 is neutral. A low pH (about 1 or 2) is acidic and a high pH (12 or 14) is basic.
When we change the moderately acidic environment to a basic environment. We actually increase the pH value in the graph showing the peroxidase activity decreases when pH increases more than 6.
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HELP ME PLEASE !!!
One time I went to the mountains. I was scared of altitude sickness, so I got cannisters of oxgen (O₂). These cannisters contain 2L of compressed oxygen (O₂). When the oxygen is pressurized, it condenses into its liquid form inside the cannister. How much would this oxygen (0₂) weigh in its liquid form?
2.9 grams
1.6 grams
3.6 grams
4.3 grams
Answers
According to the question,4.3 grams would this oxygen (0₂) weigh in its liquid form.
What is the oxygen ?
Oxygen is an essential element for life. It is a colorless, odorless gas that makes up about 21% of the Earth's atmosphere. Oxygen is a vital component for the production of energy in all living things, as it is necessary for the process of respiration. Without oxygen, all living organisms would suffer, as their cells would not be able to produce the energy they need to survive. Oxygen is also necessary for the combustion of fuels, as it helps to create the conditions required for burning to occur. In addition, oxygen is used in many different industrial and scientific processes, ranging from welding to creating rocket fuel. Oxygen is incredibly important to life on Earth and is essential for the survival of all organisms.
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2) What is the pH when the concentration of [H*] is 4.22 x 108
3) What is the pH when the pOH is 7
4) What is the concentration of [OH¹¹] when the pH is 4.3
5) What does it mean to be diprotic?
6) What does amphoteric mean?
7) WHat can you use to measure pH?
8) WHat does a buffer solution do?
9) What does titration do?
10) What is the difference between a strong acid and a weak acid?
Answers
2. The pH is 4.22 × 10⁸. 3. pH is 7, 4. pOH is 9.7, 5. diprotic is explained below, 6. Amphoteric is explained below, 7. pH meter, 8. A buffer solution is explained below, 9. Titration is explained below, 10. Difference between strong and weak acids is explained below.
2. pH = -log[H⁺]
pH = -log(4.22 x 10⁻⁸)
pH ≈ 7.375
3. pH + pOH = 14
pH + 7 = 14
pH = 14 - 7
pH = 7
4. pH + pOH = 14
pOH = 14 - pH
pOH = 14 - 4.3
pOH ≈ 9.7
Now,
[H⁺] × [OH⁻] = 1.0 x 10⁻¹⁴
[OH⁻] = 1.0 x 10⁻¹⁴ / [H⁺]
[OH⁻] = 1.0 x 10¹⁴ / 10^(-pOH)
[OH⁻] = 1.0 x 10⁻¹⁴ / 10^(-9.7)
[OH⁻] ≈ 1.99 x 10⁻⁶ M
5. Being diprotic means that a molecule or ion can donate or release two protons (H⁺ ions) in an acid-base reaction.
6. Amphoteric refers to a substance that can act as both an acid and a base.
7. The pH can be measured using a pH meter or a pH indicator.
8. A buffer solution is a solution that can resist changes in pH when small amounts of acid or base are added to it.
9. Titration is a laboratory technique used to determine the concentration of a solution by reacting it with a solution of known concentration (titrant) of another substance.
10. A strong acid is an acid that completely ionizes in water, releasing all of its hydrogen ions. A weak acid is an acid that does not completely dissociate into ions when dissolved in water.
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g Ions B and C react to form the complex BC. If 35.0 mL of 1.00 M B is combined with 35.0 mL of 1.00 M C, 0.00500 mol of BC is formed. Determine the equilibrium constant for this reaction.
Answers
Answer:
Kf = 0.389.
Explanation:
Hello there!
In this case, it turns out possible for us to solve this problem by firstly writing the equilibrium chemical equation and equilibrium expression for the formation of this complex:
\(B+C\rightleftharpoons BC\\\\Kf=\frac{[BC]}{[B][C]}\)
Thus, we firstly calculate the concentrations at equilibrium, knowing that the reaction extent in this case is 0.00500mol (same as the formed moles of BC):
\([B]=[C]=\frac{0.0350L*1.00mol/L-0.00500mol}{0.0700L} =0.429M\)
\([BC]=\frac{0.00500mol}{0.0700L} =0.0714M\)
And finally, the equilibrium constant:
\(Kf=\frac{0.0714}{[0.429][0.429]}\\\\Kf=0.389\)
Regards!
A solution is made by dissolving 38.81 grams of nickel (II) sulfate, NiSO4, in enough water to make 0.467
liters of solution. Calculate the molarity of this solution.
Answers
The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M
How do i determine the molarity of the solution?First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:
Mass of NiSO₄ = 38.81 grams Molar mass of NiSO₄ = 154.75 g/molMole of NiSO₄ = ?Mole of NiSO₄ = mass / molar mass
= 38.81 / 154.75
= 0.25 mole
Now, we shall determine the molarity of the solution. Details below:
Mole of NiSO₄ = 0.25 moleVolume of solution = 10.467 LMolarity of solution = ?Molarity of solution = mole / volume
= 0.25 / 0.467
= 0.535 M
Thus, the molarity of the solution is 0.535 M
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Nitrogen-13 has a half-life of 20 minutes. how much of a 100 mg sample would remain after 60 minutes?
Answers
The amount of nitrogen-13 sample that remained after 60 minutes has been 25mg.
Half-life can be described as the time required by the substance to reduce half of its initial concentration.
The half-life of Nitrogen-13 has been 20 minutes. In 20 minutes, the sample will be reduced to half of its concentration,
The total time has been 60 minutes.
The number of half-life experienced by the sample has:
Number of half life= Total time/half life
Number of half life cycles= 60/20=3
The number of half-life cycles = 3
The sample has been reduced to 50% in the first half-life cycle and reduced to 25% by the end of 2nd half-life cycle.
The sample remained = 25% of the initial concentration.
The sample remained = 25/100.100 mg
The sample remained = 25 mg
Therefore, the amount of nitrogen-13 sample that remained after 60 minutes has been 25mg.
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If you hear on the news that the epicenter of an earthquake is at "Union City," this means:
the earthquake started directly below Union City
the earthquake's focus was at the surface in Union City
the earthquake destroyed Union City
Answers
Answer:
B
Explanation:
the lattice constant of gaas is 5.65 a, determine the number of ga atoms and as atoms per c m 3 . (b) determine the volume density of germanium atoms in a germanium semiconductor. the lattice constant of germanium is 5.65 a..
Answers
The Number of atoms per unit cell for Ga = 4 atoms per unit cell. Number of atoms per unit cell for As = 4 atoms per unit cell. Volume density of Germanium in its unit cell = 4.35 × 10²² /cm³
According to published data, GaAs has a number density of 4.42 x 10²²atoms/cm³.
Because it is well known that Ga and As are essentially equally distributed throughout GaAs.
Ga's number density is equal to As's number density (2.21 x 10²² atoms/cm³).
Volume of the unit cell = (lattice parameter)³ = (5.65 × 10⁻⁸)³ = 1.804 × 10⁻²² cm³
a) Number of atoms per unit cell for Ga and As = number density × volume of unit cell = 2.21 × 10²² × 1.804 × 10⁻²² = 4 atoms/unit cell
b) Volume density = Number of atoms per unit cell/volume of unit cell
A germanium unit cell contains 8 atoms (from literature)
Volume of unit cell = (lattice parameter)³ = (5.65 × 10⁻⁸)³ = 1.804 × 10⁻²² cm³
Volume density = 8/(1.804 × 10⁻²²) = 4.35 × 10²² /cm³
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A scientist sees that bubbles of gas are made when he pours hydrochloric acid on to pieces of marble.
The scientist thinks the gas produced is carbon dioxide.
Describe a test he would do to prove this and include the result of the test.
Answers
If the limewater turns milky after adding gas sample, it confirms that the gas produced during reaction between hydrochloric acid and marble is indeed carbon dioxide.
What happens when hydrochloric acid is poured on to pieces of marble?To confirm that the gas produced is carbon dioxide, scientist could perform the following test:
Collect a sample of gas produced during reaction between hydrochloric acid and marble. This can be done by placing container over the reaction mixture and allowing gas to bubble into it.
Add few drops of limewater (aqueous calcium hydroxide) to collected gas sample. If gas is carbon dioxide, it will react with limewater to form milky precipitate of calcium carbonate.
Observe the appearance of limewater after the addition of gas sample. If limewater turns milky, it indicates the presence of carbon dioxide gas. If limewater remains clear, then gas produced is not carbon dioxide.
Therefore, if limewater turns milky after adding the gas sample, it confirms that gas produced during reaction between hydrochloric acid and marble is carbon dioxide.
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An unknown homonuclear diatomic gas has a volume of 2.5L at standard conditions of temperature and pressure, and it has a mass of 3.571g. What is the molecular formula for the gas
Answers
Answer: 16g/mol; O2
Explanation:
The gas has a volume of 2.5L at STP, so the number of moles can be determined as follows.
n=2.5L×1mol/22.4L=0.1116mol
The mass is given to be 3.571g. The molar mass of the unknown gas can be determined by dividing grams by moles.
3.571g/0.1116mol=32.00g/mol
The gas is a homonuclear diatomic gas, so the gas must contain two atoms with a molar mass of 32g/mol/2=16g/mol. This is the molar mass of the element oxygen, so the gas is diatomic oxygen, O2.
The molecular formula of the gas is O₂
We'll begin by calculating the number of mole of the gas that occupied 2.5 L at stp. This can be obtained as follow:
22.4 L = 1 mole of a gas
Therefore,
2.5 L = 2.5 / 22.4
2.5 L = 0.1116 mole of the gasNext, we shall determine the molar mass of the gas. This can be obtained as follow:
Mass of gas = 3.571 g
Mole of gas = 0.1116 mole
Molar mass of gas =?\(Mole = \frac{mass}{molar mass} \\\\0.1116 = \frac{3.571}{molar mass }\)
Cross multiply
0.1116 × molar mass = 3.571
Divide both side by 0.1116
Molar mass = \(\frac{3.571}{0.1116}\\\\\)
Molar mass of gas = 32 g/molSince the gas is a homonuclear diatomic gas (i.e a molecule of the same element), the molar mass of the element that makes up the gas = 32/2 = 16 g/mol
Comparing the molar mass of the element (i.e 16 g/mol) that makes up the gas with those in the periodic table, the element is oxygen.
Therefore the gas is oxygen gas and the molecular formula is O₂
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1. Matter can (change form/be created)
Answers
Answer: Yes
Explanation:
Duh it can change. Because matter is what we are made of, and if we change, then matter also changes along with us :)
In three to four sentences, explain the forces
on the child and the boat. How does this
Newton's Third Law of Motion?
demonstrate
Answers
According to Newton's Third Law of Motion, The force the child applies on the boat same force that is applied to the child.
The third regulation states that for every movement (force) in nature there is the same and contrary reaction. If item A exerts a force on object B, object B also exerts an identical and contrary force on item A. In different phrases, forces result from interactions.
The swimmer whilst swimming pushes in opposition to the pool wall along with his feet and in return hurries up (swims) inside the course contrary to that of his push. Newton's third law of motion states that for each movement, there may be the same and contrary reaction.
The third law states that for each motion (pressure) in nature there is a same and contrary reaction. If object A exerts pressure on item B, object B also exerts an identical and contrary pressure on object A.
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Calculate the pH for the following concentration: [H3O+] = 2.19 x 10-5 M
Answers
pH = -log([H3O+])
[H3O+] = 2.19 x 10^-5 M
pH = -log(2.19 x 10^-5)
pH = -log(2.19) - log(10^-5)
pH = -log(2.19) + 5
pH = 5 - log(2.19)
Approximating log(2.19) to 2 decimal places, we have:
pH = 5 - log(2.19) = 5 - 0.345 = 4.655
So the pH of the solution is approximately 4.655
What two processes can harm soil fertility
Answers
Over-tilling and Over farming are the two processes that can harm the fertility of the soil.
Over-tilling refers to the exceeding levels of tilling and levelling the soil which adversely affects the quality of the soil. This is because tillage fractures the soil, it disrupts soil structure, accelerating surface runoff and soil erosion. Tilling of soil also reduces crop residue, which help cushion the force of pounding raindrops.
Without crop residue, soil particles become more easily dislodged, being moved or 'splashed' away. The splashed particles clog soil pores, effectively sealing off the soil's surface, resulting in poor water infiltration and hence subsequently affects the soil fertility.
Similarly, the main effect of over-farming is soil depletion. When crops are grown in the same place year after year, the soil becomes depleted of the nutrients that the plants need to grow. This can lead to lower yields and poorer quality crops. In extreme cases, it can lead to desertification.
So, these two are the processes that can harm soil fertility.
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Which of the following units would you use to describe width of a small piece of metal? Ounce Mole Millimeter Milliliter
Answers
Answer:
Millimeter can be used to describe the width of a small piece of metal
Explanation:
The most appropriate unit to describe the width of a small piece of metal would be millimeters (mm). Millimeters are commonly used to measure small lengths or dimensions, such as the width of objects. This unit provides a precise and accurate measurement for small-scale items.
Ounces (oz) are typically used to measure weight or volume and may not be suitable for describing the width of an object.
Moles (mol) are used in chemistry to quantify the amount of a substance, so it is not relevant for measuring dimensions.
Milliliters (ml) are used to measure volume, specifically the capacity of liquids, and are not typically used to describe the width of a solid object.
Therefore, when discussing the width of a small piece of metal, millimeters (mm) would be the appropriate unit as it specifically measures small lengths or dimensions.
AI said C. Millimeter.
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