How much space would one mole of grass take up?
Answers
Answer:
If there's a grass area in the shape of a square and one side is 8 metres how much would it cost to fill the grass with fresh gravel at $5/metre
Related Questions
what is a mixture of elements and compounds
Answers
The substance in the image above would be classified as a mixture of elements (option E).
What is a compound and mixture?A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.
On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.
According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.
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what is the osmolarity of a 0.7 m kno3 solution?
Answers
We cannot compute the osmolarity of the solution since the volume of the solution is not supplied.
What is osmolarity?Osmotic concentration, formerly known as osmolarity, is a solute concentration measurement defined as the number of osmoles of solute per litre of solution. The osmolarity of a solution is commonly stated as Osm/L, in the same way that the molarity of a solution is expressed as "M". The amount of particles dissolved in a fluid. Serum osmolality can aid in the diagnosis of a variety of medical problems, including dehydration, diabetes, and shock.
Here,
The concentration of solute particles in a solution may be used to calculate the osmolarity of a solution. The osmolarity of a 0.7 M KNO3 solution may be determined as follows:
Osmolarity = (number of moles of solute) / (volume of solution in liters)
Since 1 mole of KNO3 contains 1 mole of potassium ions (K+) and 3 moles of nitrate ions (NO3-), the number of moles of solute in the 0.7 M KNO3 solution can be calculated as:
Number of moles = 0.7 x (1 + 3) = 2.1 moles
Since the volume of the solution is not specified, we cannot calculate the osmolarity of the solution.
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decide which element probably has a melting point most and least similar to the melting point of rubidium.
Answers
Florine is our least similar and cesium is our most similar in melting point.
Melting point is the temperature at which the solid and liquid forms of a pure substance will exist in equilibrium. As heat is applied to a solid, its temperature will increase till the melting point is reached.
If we apply more heat then it will convert the solid into a liquid with no temperature change. Now when all the solid has melted, additional heat will raise the temperature of the liquid. The melting temperature of crystalline solids is a very characteristic figure and it is used to identify pure compounds and elements.
From the melting point data we can say that florine will be least similar to rubidium and cesium will be most similar to rubidium.
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24. what is the most likely method of decay of the radioactive isotope technicium-99 (99tc)? a. alpha decay b. beta decay c. electron capture d. positron emission e. both electron capture and positron emission
Answers
The radioactive isotope Technium-99 decays most likely through alpha decay (99tc). An atomic nucleus emits an alpha particle during the radioactive decay process known as "alpha decay".
and then changes or "decays" into a separate atomic nucleus with a mass number that is decreased by four and an atomic number that is decreased by two. The nucleus of an atom of helium-4 is the same as an alpha particle. Radioisotopes are an element's radioactive isotopes. They are the atoms with unstable neutron-proton combinations or excess energy in their nuclei. During those processes, the radionuclide is said to experience radioactive decay, albeit the surplus energy may be put to use in any number of ways.
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Round to 4 significant figures
4,567,985
Answers
Example:
1,100 has two significant figures
OR
4.568 x 10^6 with scientific notation. The decimal indicates reading left to right, excluding zeroes before the first digit from the left.
when an acid mixes with a bases it is called a combination reaction?
true
false
Answers
Problem #1 : Radioisotopes are used for a variety of medical purposes including as cancer treatments. Attaching an alpha emitter to an antibody allows for a targeted therapy which can be less damaging to healthy tissue than some other cancer treatments. One such alpha emitter is Astatine 211 (211At) which undergoes LaTeX: \alpha α decay (hence the name, alpha emitter).
1.) What isotope is created by the LaTeX: \alpha α decay of 211At? 2.) How many p+, n0, and e- does it have?
Problem #2 : The grand dream of the protoscience called Alchemy was the transmutation of Lead (Pb) into Gold (Au). Thousands of years later, surely we can do better... after all, Platinum (Pt) is what everyone wants these days. We'll start with an isotope of lead, 209Pb which undergoes LaTeX: \beta β - decay. In reality, that is the end of our tale. However, this is a thought exercise and we can do what we want. Using the different types of radioactive decay described above, but still starting with LaTeX: \beta β - decay, how could we get 209Pb to Pt?
1.) What isotope is created by the LaTeX: \beta β - decay of 209Pb?
2.) Come up with a sequence of radioactive decay steps that would then lead to an isotope of Pt.
3.) What isotope of Pt did you create? How many p+, n0, and e- does it have?
Answers
Answer and Explanation: Many nuclei are radioactive, which means they emit particles to become stable. In the process, they also become a different element. There are 3 types of decay:
Alpha decay: it emits a particle of Helium, i.e., emits a particle with 2 as atomic number (Z) and 4 as atomic mass (A);Beta decay: emits an electron: a particle with 0 mass and -1 as atomic number;Gamma decay: emits a high energy form of electromagnetic radiation and it is extremely dangerous and penetrating;Problem #1:
1.) Astatine: Z = 85 and A = 211
Alpha decay: \({{A=211} \atop {Z=85}} \right. At\) ⇒ \({{207} \atop {83}} \right. Bi + {{4} \atop {2}} \right. \alpha\)
The isotope created is Bismuth
Characteristics: Z = 83; e⁻ = 83; n = A - Z = 207 - 83 = 124
The isotope is Bismuth with 83 protons, 83 electrons and 124 neutrons.
Problem #2
1.) Lead: Z = 82 and A = 82
Beta decay: \({{209} \atop {82}} \right. Pb\) ⇒ \({{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta\)
The isotope created is talium.
2.) \({{209} \atop {82}} \right. Pb\) ⇒ \({{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta\)
\({{209} \atop {81}} \right. Tl\) ⇒ \({{205} \atop {79}} \right. Au+{{4} \atop {2}} \right. \alpha\)
\({{205} \atop {79}} \right. Au\) ⇒ \({{205} \atop {78}} \right. Pt+{{0} \atop {-1}} \right. \beta\)
3.) The isotope created is \({{205} \atop {78}} \right. Pt\).
p⁺ = 78; e⁻ = 78; n = 127
The isotope created ahs 78 protons, 78 electrons and 127 neutrons.
Does the entropy of the system increase, decrease, or stay the same for each of the following conditions.
Drag the appropriate items to their respective bins.
Increases
The volume of a gas increases. Equal volumes of ethanol and water
are mixed to form a solution. The temperature of the system
increases.
increases Decreases Stays the same
Answers
The entropy of the system increases if equal volumes of ethanol and water are mixed to form a solution and the volume of a gas increases.
The entropy of the system stays the same if the temperature of the system increases
What is entropy?Entropy can be thought of as a measure of the system's "disorder" or "randomness."
A system with high entropy has many possible arrangements, and its constituents are more randomly distributed, while a system with low entropy has fewer possible arrangements and is more ordered.
A. Equal volumes of ethanol and water are mixed to form a solution: When two substances with different molecular arrangements (ethanol and water) are mixed, the number of microstates available to the system increases, leading to an increase in entropy.
B. The volume of a gas increases: When the volume of gas expands, the gas molecules have more space to move around, resulting in an increase in the number of possible arrangements and, therefore, an increase in entropy.
The entropy of the system stays the same for the following condition:
C. The temperature of the system increases: The entropy change due to a temperature increase depends on the specific system. For ideal gases, the entropy increases as the temperature rises.
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Your question is incomplete, but most probably your full question was,
Does the entropy of the system increase, decrease, or stay the same for each of the following conditions: Increases, Decreases, Stays the same
1. Equal volumes of ethanol and water are mixed to form a solution
2. The temperature of the system increases.
3. The volume of a gas increases.
Why is it impossible for an electron to have the quantum numbers n = 1, l = 1, ml = 0, ms = –? (2 points)
Answers
The spin of the electron is represented by the spin quantum number, ms; ms = +1/2 or -1/2.
Electron in orbital type 2pz.
The primary quantum number, n=1, 2, 3, and n=2 (the second energy level), is one of the four quantum numbers that are assigned to each electron in an atom to define that electron's state.
An atomic orbital's azimuthal quantum number characterizes the form of the orbital and is used to calculate the orbital's angular momentum. When l = 1, the p subshell is defined as l = 0,1...n-1.
The orbital in which the electron is placed is indicated by the magnetic quantum number, ml. ml = -l...+l, and ml = 0 indicates the Pz orbital.
The spin of the electron is represented by the spin quantum number, ms; ms = +1/2 or -1/2.
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Mr. Hackworth toasts a marshmallow over a fire. The outside of the marshmallow turns black, a new substance with new properties is created on the outside of the marshmallow, and the marshmallow gives off an odor. What type of change occured?
A
Physical, because color is a physical property.
B
Physical, because a new substance was created, smell, and color change.
C
Chemical, because a new substance was created, smell, and color change.
D
Chemical, because color is a chemical property.
Answers
Answer:
C
Explanation:
This is a chemical property because a catalyst is added(fire). Without a catalyst a marshmallow would stay a marshmallow. The sugar caramelizes(this is not physical because sugar is burning)
A fixed quantity of gas occupies a volume of 1.500 l at 1.25 atm. assuming the gas is compressed at constant temperate, use boyle's law to compute the volume of the gas when the pressure reaches 3.75 atm
Answers
Boyle's law states that as pressure increases, volume of a gas decreases. The gas occupies a volume of 0.5 l when the pressure increases from 1.25 atm to 3.75 atm.
What is Boyle's law?According to Boyle's law, at constant temperature, the volume of a gas is inversely proportional to the pressure. Hence,
PV = a constant.
Let P1 and V1 be the initial pressure and volume and P2, V2 be the final quantities, then,
P1 V1 = P2 V2.
Given that, P1 = 1.25 atm
V1 = 1.5 L
P2 = 3.75 atm
Then, V2 = P1 V1/ P2
V2 = (1.5 × 1.25) /3.75 = 0.5 L
Therefore, the volume of the gas at a pressure of 3.75 atm is 0.5 L.
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what is the mole fraction of potassium permanganate, kmno4, in an aqueous solution that is 7.854 wt % in potassium permanganate? mw(kmno4)
Answers
Mole fraction of KMnO4 = (0.07854 / 158.04) / [(0.07854 / 158.04) + (0.92146 / 18.015)] = 0.0051, Therefore, the mole fraction of KMnO4 in the aqueous solution is 0.0051.
The mole fraction of potassium permanganate, KMnO4, in an aqueous solution can be calculated using the formula:
Mole fraction of KMnO4 = (Mass fraction of KMnO4 / MW of KMnO4) / [(Mass fraction of KMnO4 / MW of KMnO4) + (Mass fraction of water / MW of water)]
Given that the aqueous solution is 7.854 wt % in KMnO4 and the MW of KMnO4 is 158.04 g/mol, we can calculate the mass fraction of KMnO4 as:
Mass fraction of KMnO4 = (7.854 g KMnO4 / 100 g solution) = 0.07854
The MW of water is 18.015 g/mol. Assuming the solution is dilute, we can approximate the density of the solution to be 1 g/mL. Using these values, we can calculate the mass fraction of water as:
Mass fraction of water = (100 g solution - 7.854 g KMnO4) / 100 g solution = 0.92146
Substituting these values in the formula for mole fraction, we get:
Mole fraction of KMnO4 = (0.07854 / 158.04) / [(0.07854 / 158.04) + (0.92146 / 18.015)] = 0.0051
Therefore, the mole fraction of KMnO4 in the aqueous solution is 0.0051.
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what is the name of the addictive chemical naturally found in tobacco plants and later in tobacco products?
Answers
Answer:
Nicotine
Explanation:
which part of the tpp coenzyme acts as a long range electron sink? the positive nitrogen in the thiazolium ring. the sulfur atom in the thiazolium ring. the negatively charged carbanion. the acidic proton.
Answers
The positively charged nitrogen in the thiazolium ring of TPP (thiamine pyrophosphate) acts as a long-range electron sink.
Thiamine pyrophosphate (TPP) is an important coenzyme involved in several metabolic pathways, including the citric acid cycle and the pentose phosphate pathway. The positively charged nitrogen in the thiazolium ring of TPP acts as a long-range electron sink. It stabilizes the negative charges that develop on adjacent carbonyl groups during reactions, allowing the transfer of electrons over long distances. This is essential for catalytic activity in enzymes that use TPP as a coenzyme. The nitrogen in the thiazolium ring can also form hydrogen bonds with other groups in the enzyme, further stabilizing its position and enhancing its ability to act as an electron sink.
TPP is involved in the decarboxylation of pyruvate to acetyl-CoA, an important step in energy metabolism. During this reaction, the negative charge that develops on the carbonyl group of pyruvate is stabilized by the positively charged nitrogen in TPP, allowing the release of carbon dioxide and the formation of acetyl-CoA. Without TPP, this reaction would not occur efficiently, leading to a buildup of pyruvate and a decrease in ATP production. Overall, the ability of the positively charged nitrogen in TPP to act as a long-range electron sink is critical for the proper functioning of many metabolic pathways in the cell.
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-Identify the following whether it is Physical or Chemical change.
1. freezing
6. burning of paper
2. burning wood
7. digestion of food
3. melted ice cream
8. evaporation
4. boiling water
9. sublimation
5. condensation
10. Exploding firecrackers
Answers
P c c c p p p p p c
My answers are by the way they are written p-phy c-che
pcccpppppcplease help me, please
Answers
Answer: NaCl and H2O
Explanation: Products are on the right side of the arrow :)
Answer:
B. NaCI
D. H2O
Explanation:
The product is the result, which in this case is sodium chloride and water.
Please mark as Brainliest!!!What is the molecular formula for a compound that is 40% Carbon, 6.7%
Hydrogen, and 53.3% Oxygen with a molar mass of 90 amu?
Your answer
Answers
Answer:
C1H201 or COH2
Explanation:
The molecular formula of the compound can be determined by finding the number of atoms of each element in a molecule and combining them to form the molecular formula.From the percent composition, we can find the number of moles of each element in 100 g of the compound.
40 g of Carbon, which is equal to 40/12 = 3.33 moles of Carbon
6.7 g of Hydrogen, which is equal to 6.7/1 = 6.7 moles of Hydrogen
53.3 g of Oxygen, which is equal to 53.3/16 = 3.33 moles of Oxygen
The molar mass of the compound is 90 amu, so there are 90 g/mol of the compound.The molecular formula can be determined by dividing the number of moles of each element by the smallest number of moles of the elements, then rounding to the nearest whole number.
Carbon: 3.33 moles / 3.33 moles = 1
Hydrogen: 6.7 moles / 3.33 moles = 2
Oxygen: 3.33 moles / 3.33 moles = 1
Therefore, the molecular formula for the compound is C1H2O1 or COH2.
Hope this helps! Correct me if I’m wrong.
Directions:
Read the question carefully.
Write your response in at least three (3) sentences.
Use the HINT and SENTENCE STARTERS to help you with the response.
Question:
Imagine you're cooking dinner for a few of your friends. You decide to make a salad with homemade dressing. Why do you need to think about the polarity of the different ingredients in your salad dressing in order for it to turn out well? [HINT: "Like dissolves like"]
Sentence Starters:
- For the ingredients of a salad dressing to mix well, they should either...
- If both polar and nonpolar ingredients should be used, then they ...
Answers
The reason I have to think about the polarity of the different ingredients in my salad dressing in order for it to turn out well is simply because so that the soluble ingredients can dissolve completely and have a nice taste.
What is polarity?Polarity can simply be defined as a state of an atom or a molecule inherent in a body that exhibits opposite properties or powers in opposite parts or directions.
So therefore, the reason I have to think about the polarity of the different ingredients in my salad dressing in order for it to turn out well is simply because so that the soluble ingredients can dissolve completely and have a nice taste.
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- If Earth's rate of rotation decreased, there
would be an increase in the
(1) length of the seasons
(2) sun's angle of insolation at noon
(3) number of observable stars seen at night
during the year
(4) length of an Earth day
Answers
Answer: length of an earth day
Explanation:
Which quantum number represents the main energy level of an electron?
A. n
B. m
c. e
D. /
Answers
Answer:
A
Explanation:
a particular brand of gasoline has a density of 0.737 g/ml at 25 ∘c . how many grams of this gasoline would fill a 13.5 gal tank ( 1us gal
Answers
Mass of gasoline = 37662.93 grams.
Density = mass/volume
mass = Density × volume
mass = 0.737 × 13.5 ×3785.41
mass = 37662.93 g
What is gasoline ?The word "gasoline" is an American term for motor vehicle fuel. The trademark "Cazeline" or "Gazeline," which bears the last name of British publisher, coffee trader, and social activist John Cassell, is claimed to have had some impact on the phrase.
Gasoline, usually spelled gasolene, is a blend of flammable, volatile liquid hydrocarbons made from petroleum that is used as internal combustion engine fuel.
Numerous distinct compounds containing hydrogen and carbon make up gasoline (hydrocarbons). About 150 distinct hydrocarbons, including butane, pentane, isopentane, and the BTEX chemicals, are often included in a normal gasoline combination (benzene, ethylbenzene, toluene, and xylenes).
Crude oil, which comprises hydrocarbons, organic compounds formed completely of hydrogen and carbon atoms, is the raw material used to make gasoline.
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chemical reactions amplify 1.1 pre assessment
Answers
Chemical reactions are the various types of permanent changes which occur in substances and which produce new substances .
What are chemical reactions?Chemical reactions are changes which occur in the arrangement of atoms in a substance resulting in the formation of new substances.
There are many types of chemical reactions such as:
combination reactionsdisplacement reactionsdecomposition reactionsoxidation reactionsdouble displacement reactionsThe various types of chemical reactions that occur contribute to the numerous compounds and substance in existence today.
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what is 37degrees Celsius in Si units
Answers
Answer:
310.15 Degrees Kelvin
Explanation:
37 Degrees Celsius = 310.15 Degrees Kelvin = 98.6 Degrees Fahrenheit
Conversion Factor from Celsius to kelvin
or 37 + 273 = 310 Degrees Kelvin
What volume in milliliters of 6.0 M NaOH is needed to prepare 175mL of 0.20 M NaOH by dilution?
Answers
Answer:
V¹N²= V²N²
here V¹= ?
N¹= 6.00
V²= 175ml
M²= 0.2M
So V¹= (V²N²)/N² = (175 x 0.2)/6
V¹ = 5.83 ml
Explanation:
Therefore diluting 5.83 ml of 6.00M NaOH to 175 m l ,we get 0.2M Solution.
5.83 ml of 6.0 M NaOH is required to prepare 175 ml of 0.20 M NaOH by dilution according to the concept of molar concentration.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.For the mentioned example volume of 6 M NaOH is found out as,
M₁V₁=M₂V₂
∴V₁=0.20×175/6=5.83 ml
Thus, 5.83 ml of 6 M NaOH is required to prepare 175 ml of 0.20 M NaOH by dilution.
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Which of the following should have the highest boiling point? A. CF4 B. CCl4. C. CBr4. D. CI4 E. CH4.
Answers
The compound with the highest boiling point is CI₄. The correct answer is option D.
We know that boiling point is directly proportional to the strength of intermolecular forces. The greater the strength of these forces, the greater is the boiling point. All the given compounds are halogen derivatives of methane, hence they are non-polar in nature. Therefore, the intermolecular forces are van der Waal's forces, also known as London forces. The molecular weight of all the given compounds is the same, which means the electron density is the same. So, the strength of intermolecular forces will depend on the size of halogens.
Among the given compounds, the size of halogen increases from fluorine to iodine. Iodine is the largest halogen, so its molecule will be the most polarizable, which means the temporary dipoles will be more significant, leading to stronger intermolecular forces.
Hence, CI₄ will have the highest boiling point. The correct answer is option D.
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Which of the following best represents and explains the formula for a compound made from nitrogen and hydrogen?
Answers
Answer:NH4, because nitrogen needs four electrons, and each hydrogen needs one electron.
Explanation:
What is ionic bond and explain it
Answers
Answer:
An ionic bond is a chemical bonding involving the attraction between oppositely charged ions
Explanation:
On the periodic table, elements from group 1 and 7 are attracted to each other and when they bond, it's called ionic bonding. This is because of their valence electrons and ions.
Answer:
Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds. It is one of the main types of bonding along with covalent bonding.
Someone please help me with this !
Answers
Answer:
1) 7.256 mol Br2 (Cl2)/(Br2)
The Br2 cancels out, so we have 7.256(2)
This is 14.512.
2) Number of moles = mass / molar mass
Number of moles = 239.7 g/ 35.5 g/mol
Number of moles = 6.8 mol
BrCl=13.6 mol
13.6(11.5.357)
1568.9 g
3) Repeat the same process with problem 2, given that there are 6.022x10^23 atoms in a mole.
Explanation:
Br2 + Cl2 → 2BrCl
i need help writing a LAB REPORT about NATURAL SELECTION
(plus i don’t know what exact subject it is so i’m sorry if it’s the wrong subject)
Answers
Answer:
Translate from Ukrainian.
У цей приклад я візьму селекції пшениці. Коли ми будемо говорити про селекцію цього злака, то ми можемо отримати меньшу собівартість, та вартість вирощування. Збільшена урожайність, та менша потреба в гербіцидах, пестицидах, та інсектицидах це теж наслідок. Тому селекція це майбутнє!
How do we think that Mars lost atmospheric gas?
What basic planetary property would have had to be different for Mars to retain a thicker atmosphere?
Answers
the rocky planet was exposed to harsh and forceful solar winds, which blew the Martian atmosphere away.
Another option for thickening the atmosphere of Mars, and, in turn, raising the temperature of the planet, would be to set up solar-powered, greenhouse-gas producing factories.