Answers
Producers are the organisms that can produce their own food through photosynthesis or chemosynthesis, and they form the base of the food chain/web. All other organisms in the food chain/web rely directly or indirectly on producers for their energy needs.
Therefore, in this food web, there is only one organism that relies completely on producers for energy, and that is the herbivore (option A).
Related Questions
Argon gas has a boiling point of -197 °C. Which of the following diagrams best represents the
distribution of argon atoms in a steel sphere at -190 °C?
Answers
Answer:
(a)
Explanation:
Hello,
In this case, the temperature required to boil argon, it means, transform it from liquid to gas is -197 °C. In such a way, since the temperature inside the steel sphere is -190 °C, which is greater than the boiling point, we realize argon is gaseous, therefore, the molecules will be spread inside the sphere as they will be moving based on the kinetic theory of gases.
For that reason, answer is scheme (a).
Best regards.
which of the following statements are consistent with dalton's atomic theory as it was originally stated?
a. Sulfur and oxygen atoms have the same mass.
b. All cobalt atoms are identical.
c. Potassium and chlorine atoms combine in a 1:1 ratio to form potass...
Answers
Option B. All cobalt atoms are identical and are consistent with dalton's atomic theory as it was originally stated.
The primary part of dalton's atomic theory states that everyone relies on is manufactured from atoms, which can be indivisible. the second part of the theory says all atoms of a given element are the same in mass and house. The 0.33 part says compounds are combos of two or more exceptional kinds of atoms.
Dalton's atomic theory, atoms of one element are all the equal or same. for this reason, the assertion that every cobalt atoms are identical is consistent with Dalton's concept of the shape of atoms.
Dalton's atomic concept additionally proposed that each atom of an element is identical in nature and exceptional elements vary in length, mass, and chemical properties. So, the accurate answer is choice 1 which says that the first and 2d statements are correct.
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If you are not sure about what to do during a lab activity, what should you do?
Ask someone else at your table.
Use your best judgement.
Watch to see what everyone else isdoing.
Ask the teacher.
Answers
Answer:
ask a teacher is the correct answer.
Explanation:
You must ALWAYS ask a teacher if you are not sure about what to do during a lab activity.
Answer:
It's important to ask the teacher, lab safety policies all state that if you're confused about instructions it's always good to ask the teacher to clarify them.
is BIG LION radioactive.
Answers
Answer:
So cute and my favorite is Lion and ot is my inner pet with my zodiac sign so cute hehe
Which of the following required bohr's model of atom to need modification?
Answers
Answer:
Theres no answer choices so how are we
supposed to answer?
What is the ionic and net ionic equation for HCl + Mg(C2H3O2)2 = MgCl2 + HC2H3O2
Answers
The ionic and net ionic equation for HCl + Mg(C2H3O2)2 ⇒ MgCl2 + HC2H3O2 is H⁺ + Cl⁻ + Mg⁺ + C₂H₃O₂⁻ → Mg⁺ + Cl₂⁻ + H⁺ + C₂H₃O₂⁻.
What is ionic equation ?Ionic equations are chemical equations that only show the ions involved in a chemical reaction. In other words, ions that combine in solution to form new substances. The ions that do not participate are referred to as spectator ions.
A net ionic equation depicts only the chemical species involved in a reaction, whereas a complete ionic equation depicts the spectator ions as well.
Thus, H⁺ + Cl⁻ + Mg⁺ + C₂H₃O₂⁻ → Mg⁺ + Cl₂⁻ + H⁺ + C₂H₃O₂⁻ this is the net ionic equation.
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Explain why Na could bond with F and Be could bond with Br?
Show all formulas and names of all possible molecules formed with the elements in the question above?
Answers
Na (sodium) and F (fluorine) can bond because they have different electronegativities. Electronegativity is a measure of an atom's ability to attract electrons to itself. Fluorine is one of the most electronegative elements on the periodic table, while sodium is one of the least electronegative. This creates an electrostatic attraction between the two atoms, allowing them to form a chemical bond. The bond between Na and F is called an ionic bond.
The ionic bond between Na and F is formed when the sodium atom loses one electron to form a Na+ cation, and the fluorine atom gains one electron to form a F- anion. The resulting molecule is NaF.
Be (beryllium) and Br (bromine) can bond because they also have different electronegativities. Be is less electronegative than Br, and this creates an electrostatic attraction between the two atoms, allowing them to form a chemical bond. The bond between Be and Br is called a covalent bond.
The covalent bond between Be and Br is formed when both atoms share electrons. The resulting molecule is BeBr2 (Beryllium dibromide).
In general, it's important to note that the type of bond formed between two atoms depends on their electronegativities, if they are similar they tend to form covalent bond and if they are different they tend to form ionic bonds.
What is the percent of C in Ca(C2H3O2)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol, H= 1.01 g/mol, O= 16.00 g/mol)
[?]% C
Answers
The percent by mass of the carbon is 30.4%.
What is the percentage of calcium?The term percentage has to do with the ratio of the mass of a particular atom to the total mass of the compound multiplied by one hundred. Thus the first step is to find the total mass or the molar mass of the compound.
Molar mass = 40 + 2(2(12) + 3(1) + 2(16))
= 40 + 2(24 + 3 + 32)
= 40 + 2(59)
= 40 +118
= 158
Thus the mass of carbon is;
4(12)/158 * 100/1
= 30.4%
Thus carbon is only about 30.4% by mass of the compound.
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you react 62 g of aluminum with 36 g sulfur, what will be the theoretical yield of Al2S3?
Need this for my finals studying and can’t remember how to do it, all help is appreciated <3 im not the brightest at chemistry
Answers
Answer:
Explanation:
Based on the information provided, we can assume that the balanced chemical equation for the reaction is:
2 Al + 3 S -> Al2S3
To determine the theoretical yield of Al2S3 in this reaction, we need to determine which reactant is the limiting reactant. The limiting reactant is the reactant that is completely consumed in the reaction, and it determines the maximum amount of product that can be produced.
To do this, we can calculate the number of moles of each reactant using the molar masses of aluminum and sulfur:
62 g Al / 26.98 g/mol = 2.29 moles Al
36 g S / 32.06 g/mol = 1.12 moles S
Since the ratio of aluminum to sulfur in the balanced chemical equation is 2:3, we can compare the number of moles of each reactant to this ratio to determine the limiting reactant. Since there are fewer moles of sulfur than the ratio of 2:3, sulfur is the limiting reactant.
To calculate the theoretical yield of Al2S3, we can use the number of moles of the limiting reactant (sulfur) and the stoichiometric coefficients of the reactants and products in the balanced chemical equation:
1.12 moles S / 3 mol S/mol Al2S3 = 0.37 moles Al2S3
Then, we can convert the number of moles of Al2S3 to grams using the molar mass of Al2S3:
0.37 moles Al2S3 * 267.86 g/mol = 99.77 g Al2S3
So the theoretical yield of Al2S3 in this
If actual yield and theoretical yield are same then the percent yield will be 100%. Generally, the actual yield is lower than the theoretical yield. Therefore, the theoretical yield of Al\(_2\)S\(_3\) is 99.77 g.
What is percent yield?Percent yield is the percent ratio of actual yield to the theoretical yield.
Mathematically,
Percent yield= actual yield of a product÷ theoretical yield of the product
The balanced reaction for the given reaction between aluminium and sulfur can be given as
2 Al + 3 S \(\rightarrow\) Al\(_2\)S\(_3\)
62 g Al / 26.98 g/mol = 2.29 moles Al
36 g S / 32.06 g/mol = 1.12 moles S
The mole ratio is 2:3, sulfur is the limiting reactant.
1.12 moles S / 3 mol S/mol Al2S3 = 0.37 moles Al\(_2\)S\(_3\)
0.37 moles Al2S3 * 267.86 g/mol = 99.77 g Al\(_2\)S\(_3\)
Therefore, the theoretical yield of Al\(_2\)S\(_3\) is 99.77 g.
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How many moles are in 123.0 grams of KClO4? (3 points)
0.2354 mol KClO4
0.6445 mol KClO4
0.7124 mol KClO4
0.8878 mol KClO4
Answers
Answer:
0.8878 mol KClO4
Explanation:
Molar mass of KClO4 = 39.0983 + 35.453 + ( 15.9994 x 4 ) = 39.0983 + 35.453 + 63.9976 = 138.5489g/mol
but,
number of moles = mass in grams / molar mass where mass in grams = 123g, molar mass = 138.5489g/mol
number of moles = 123g / 138.5489g/mol = 0.8878mol
Therefore the number of moles present in 123 g of \( KClO_4\) is 0.888 moles.
Given,
The weight of the \( KClO_4\) is 123. grams
molecular weight of \( KClO_4\) is \(39+35.5+16\times4=138.5 g\)
138.5 g of \(KclO_4\) is equal to one mole
Gram molecular wt. of a substance is equal to one mole
No. of moles = \(\frac{Wt}{GMW} \)
123 g of \(KClO_4\) is equal to \(\frac{123}{138.5}=0.888 moles \)
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all the questions 1. What contribution did de Broglie make to the development of the modern model of the atom? (A)Observed the effect of bombarding thin gold foil (and other metal foils) with alpha radiation from radioactive substances. 60 m B. Discovery of the nucleus C. Discovered that atoms and molecules emit energy only in certain discrete quantities, or quanta. D. Discovered negatively charged particles by cathode ray tube experiment E. Described the wave properties of particles
Answers
De Broglie contributed to the development of the modern model of atoms by describing the wave properties of particles. Option E.
De Broglie's contribution to atomic theoryLouis de Broglie was a French physicist who made significant contributions to the development of quantum mechanics.
In his doctoral thesis, he proposed that particles, such as electrons, have both particle-like and wave-like properties. This idea became known as wave-particle duality and laid the foundation for the development of the modern model of the atom.
According to de Broglie's theory, particles can exhibit wave-like behavior and have a wavelength that is inversely proportional to their momentum.
This theory was later experimentally confirmed in a series of experiments that demonstrated the diffraction of electrons and other particles.
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What does Bolsa suggest as the next step in their investigation?
Answers
Answer:
A) call Billy Jo Jim Bob
Explanation:
What is atom . explain
Answers
Answer:
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.
Answer:
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.
a 125 torr mixture of c2h4(g) and c3hg(g) at a given temperature was burned in excess oxygen in a rigid, sealed container. the product c02( g) was collected under the same initial reaction conditions and determined to be 280 torr. what was the mole fraction of c2h4(g) in the original mixture
Answers
Answer:
0.24
Explanation:
C2H4(g) + 3O2(g) ------> 2CO2(g) + 2H2O(g)
C3 H8 (g) + 5O2 (g) → 3CO2(g) +4H2 O(g)
Initially,
PV=nRT
125×V=(a+b)RT .....(i)
After combustion, pressure is due to the total moles of CO2
280×V=(3a+2b)RT .....(ii)
Dividing equation ii by i
280/125 = 3a+2b/a+b
2.24 = 3a+2b/a+b
2.24a + 2.24b =3a+2b
2.24b - 2b = 3a - 2.24a
0.24b = 0.76a
b= 3.2a
mole fraction of C3H8 = a/a + b = a/a + 3.2a = 1/4.2 = 0.24
Key Concepts
4 Identify What are three advantages of using
conceptual models?
Help plz
Answers
Answer:
A Broad View of Concept Modeling
Establishing Key Relationships
Levels of Concept Modeling
Explanation:
The meaning of the word symptom:
Answers
The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.
Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.
Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.
It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.
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The element lithium (Li) has 3 protons and 3 electrons. The element fluorine (F) has 9 protons and 9 electrons. An atom of the element lithium (Li) transfers an electron to an atom of the element fluorine (F). Which type of bond results between the atoms, and what happens to the charges in each of the atoms?
Answers
Answer:ionic bond
Lithium becomes +ve while FL becomes-ve
Explanation:bond btwn a metal and a none metal is called an ionic bond
Li loses one therefore it's+ve FL gains becoming -ve
Select all true statements about hybridization, of a second-row element, changing from sp2 to sp3. (max of 3 choices) a. The atom will go from a two-dimensional configuration to a three-dimensional configuration. b. The atom will go from a three-dimensional configuration to a two-dimensional configuration. c. The number of unhybridized p orbitals will increase. d. The bond angle will increase e. The bond angle will decrease f. The number of unhybridized p orbitals will decrease.
Answers
Answer:
a. The atom will go from a two-dimensional configuration to a three dimensional configuration.
d. The bond angle will increase.
f. The number of unhybridized p orbitals will decrease.
Explanation:
Sp2 is the atomic bond in which orbitals mixes with only two orbitals. These orbitals form three sp2. When two carbon atoms are overlapped they form sigma bond by overlapping of sp2 bonds. Sp3 bond is created when there is one lone molecule available for combination. When the bonding is updated from sp2 to sp3 then unhybridized orbitals will decrease causing the bond angle to increase.
2
3 of 6 - SCH4U
Date: Name(s):
4. HCl is a corrosive colourless gas that dissolves readily in water.
Aqueous HCl reacts with NaOH to form water and NaCl. In a simple
calorimeter, a 100.00 mL sample of 0.415 mol/L HCl(aq) is mixed
with 50.00 mL of excess NaOH(aq). During the reaction, there is a
rise in temperature by 4.83 °C. Calculate the molar enthalpy change
(in kJ/mol) for the above reaction. SHOW ALL YOUR WORK.
Answers
Answer: The molar enthalpy change is 73.04 kJ/mol
Explanation:
\(HCl+NaOH\rightarrow NaCl+H_2O\)
moles of HCl= \(molarity\times {\text {vol in L}}=0.415mol/L\times 0.1=0.0415mol\)
As NaOH is in excess 0.0415 moles of HCl reacts with 0.0415 moles of NaOH.
volume of water = 100.0 ml + 50.0 ml = 150.0 ml
density of water = 1.0 g/ml
mass of water = \(volume \times density=150.0ml\times 1.0g/ml=150.0g\)
\(q=m\times c\times \Delta T\)
q = heat released
m = mass = 150.0 g
c = specific heat = \(4.184J/g^0C\)
\(\Delta T\) = change in temperature = \(4.83^0C\)
\(q=150.0\times 4.184\times 4.83\)
\(q=3031.3J\)
Thus 0.0415 mol of HCl produces heat = 3031.3 J
1 mol of HCL produces heat = \(\frac{3031.3}{0.0415}\times 1=73043.3J=73.04kJ\)
Thus molar enthalpy change is 73.04 kJ/mol
i just told the guy i like that I like him and he said he wants to get to know me better before making a decision. but now everything feels different. he's been really distant. what does that mean and how do I stop getting so attached?
Answers
Answer: you have to talk to someone who wont mind wanting to wanting to like you a lot like that.
Explanation: I wish I could be able to talk to someone who would want to get to like me like that, so its a very relatable situation.
Use the following key to classify each of the elements below in its elemental form:
a. Discrete atoms
b. Molecules
c. Metallic lattice
d. Covalent Network.
1. Phosporus
2. Bromine
3. Hydrogen
4. Krypton
Answers
Explanation:
Given set of elements in one column and their classification in another column.
1. Phosporus c.Metallic lattice
2. Bromine d.Covalent network.
3. Hydrogen b. Molecules
4. Krypton a. Discrete atoms
Since Krypton is an inert gas and it exists in discrete atoms.
Hydrogen exists as a diatomic gas.
Bromine exists as Br_2 liquid and is held by covalent bonds.
Phosphorus exists as P_4 molecules and it exits as a metallic lattice.
Which two seasons are best for growing plants due to the amount of sun received at those times? (Select two.)
winter
summer
autumn
spring
Answers
Answer:
spring and summer
Explanation:
Answer:
summer and spring
Explanation:
Using stoichiometry, you predict that you should be able to use 314.0 g of Al to produce 1551 g of AlCi3. In your lab
exercise you actually produced 1400.0 g of aluminum chloride. What is your % yield for this reaction?
CORRECT ANSWER IS: 90.26% but what are the steps on how to get this answer ?
Answers
Answer:
90.26%
Explanation:
From the question given above, the following data were obtained:
Theoretical yield of AlCl₃ = 1551 g
Actual yield of AlCl₃ = 1400 g
Percentage yield =?
The percentage yield of the reaction can be obtained as follow:
Percentage yield = Actual yield / Theoretical yield × 100
Percentage yield = 1400 / 1551 × 100
Percentage yield = 140000 / 1551
Percentage yield = 90.26%
Thus, the percentage yield of the reaction is 90.26%
experimental evidence indicates that the nucleus of an atom
Answers
The nucleus of an atom is positively charged and contains most of the mass if the atom.
What is an atom?An atom is the smallest particle of a an element that can take part in a chemical reaction.
Atoms are made up of other smaller sub-particles which are:
neutrons which are neutral protons which are positively charged electrons which are negatively chargedThe protons and neutrons are found in the nucleus of an atom
The electrons are found regions around the nucleus.
Due to the positive charge of the protons, the nucleus of an atom are positively charged and is massive.
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any 3 questions of any subject
I will answer it with good explanation and reason in just 10mins for just $2
who ever need text me
Answers
Which of the following has the largest radius
A. Na
B. Na+
C. K+
D. K
Answers
If 62.1 grams of magnesium react with 100.0 grams of magnesium, how many grams of product are produced?
Which is the Limiting reactant?
Which is the Excess reactant?
How many grams of excess reactant remain?
pls help me with homework
Answers
The limiting and excess reactant can be obtained as follow:
2Mg + O₂ -> 2MgO
Molar mass of Mg = 24 g/molMass of Mg from the balanced equation = 2 × 24 = 48 g Molar mass of O₂ = 32 g/molMass of O₂ from the balanced equation = 1 × 32 = 32 gFrom the balanced equation above,
48 g of Mg reacted with 32 g of O₂
Therefore,
62.1 g of Mg will react with = (62.1 × 32) / 48 = 41.4 g of O₂
We can see from the above that only 41.4 g of O₂ is required to react completely with 62.1 g of Mg.
Thus, the limiting reactant is magnesium, Mg and the excess reactant is oxygen, O₂
How do i determine the mass of the excess reactant remaining?The mass of the excess reactant remaining can be obtained as shown below:
Mass of excess reactant, O₂ given = 100 gMass of excess reactant, O₂ that reacted = 41.4 gMass of excess reactant, O₂ remaining =?Mass of excess reactant remaining = Mass given - mass reacted
Mass of excess reactant remaining = 100 - 41.4
Mass of excess reactant remaining = 58.6 g
How do i determine the mass of product produced?The mass of H₂SO₄ produced can be obtained as illustrated below:
Mg + O₂ -> 2MgO
Molar mass of Mg = 24 g/molMass of Mg from the balanced equation = 2 × 24 = 48 g Molar mass of MgO = 40 g/molMass of MgO from the balanced equation = 2 × 40 = 80 gFrom the balanced equation above,
48 g of Mg reacted to produce 80 g of MgO
Therefore,
62.1 g of Mg will react to produce = (62.1 × 80) / 48 = 103.5 g of MgO
Thus, the mass of product, MgO produced is 103.5 g
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Complete question:
If 62.1 grams of magnesium react with 100.0 grams of oxygen, how many grams of product are produced?
Which is the Limiting reactant?
Which is the Excess reactant?
How many grams of excess reactant remain?
How many grams of NaCl
Answers
You would recover 36.525g of NaCl after evaporating all of the water.
How to find the how many grams of NaCl that would be recover when all water is evaporated off of this solution?To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:
mass = moles * molar mass
Where:
Moles = Molarity * Volume
Molarity = 0.250 M
Volume = 2500.0 mL = 2.5 L
Molar mass of NaCl = 58.44 g/mol
mass = 0.250 M * 2.5 L * 58.44 g/mol
mass = 36.525 g
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Can you look at the picture Look at the picture ASAP and help please?
Answers
Answer:
Volume of the reaction vessel is increased - shift to the left
The reaction is cooled down - shift to the right
H2 is added to the system - shift to the right
The pressure of the system is decreased - shift to the left
A catalyst is added to the system - no change
Water is removed from the system - shift to the right
Explanation:
When a constraint such as a change in temperature, pressure or volume is imposed on a reaction system in equilibrium, the equilibrium position will shift in such a way as to annul the constraint.
When the volume of a reaction system is increased, the equilibrium position shifts in the direction in which there is the highest total volume. This is the left hand side.
Since the reaction is exothermic (heat is given out) when the reaction is cooled down, the forward reaction is favoured.
Adding of reactants shifts the equilibrium position to the right hand side hence when H2 is added, the equilibrium position shifts to the right.
Decreasing the pressure shifts the equilibrium position to the direction of higher total volume hence the equilibrium shifts to the left when pressure is decreased.
A catalyst has no effect on the equilibrium position. It increases the rate of forward and reverse reaction to the same extent hence the equilibrium position is unaffected.
Removal of water from the system increases the rate of forward reaction since a product is being removed from the reaction system.
3. How many grams of oxygen are required to completely react with 240g of C₂H6?
Answers
Approximately 766.08 grams of oxygen are required to completely react with 240g of C₂H₆.
To determine the amount of oxygen required to completely react with 240g of C₂H₆ (ethane), we need to set up a balanced chemical equation for the combustion of ethane.
The balanced equation for the combustion of ethane is as follows:
C₂H₆ + O₂ → CO₂ + H₂O
From the balanced equation, we can see that the stoichiometric ratio between C₂H₆ and O₂ is 1:3. This means that for every one mole of C₂H₆, three moles of O₂ are required for complete combustion.
To calculate the amount of oxygen required, we need to convert the given mass of C₂H₆ to moles using its molar mass, and then use the stoichiometric ratio to determine the moles of O₂ required. Finally, we can convert the moles of O₂ back to grams using the molar mass of oxygen.
The molar mass of C₂H₆ is calculated as follows:
(2 x atomic mass of carbon) + (6 x atomic mass of hydrogen)
(2 x 12.01 g/mol) + (6 x 1.01 g/mol) = 30.07 g/mol
Now, we can proceed with the calculation:
Calculate the moles of C₂H₆:
moles of C₂H₆ = mass of C₂H₆ / molar mass of C₂H₆
moles of C₂H₆ = 240 g / 30.07 g/mol ≈ 7.98 mol
Determine the moles of O₂ using the stoichiometric ratio:
moles of O₂ = moles of C₂H₆ x (3 moles of O₂ / 1 mole of C₂H₆)
moles of O₂ = 7.98 mol x 3 ≈ 23.94 mol
Convert moles of O₂ to grams:
mass of O₂ = moles of O₂ x molar mass of O₂
mass of O₂ = 23.94 mol x 32.00 g/mol = 766.08 g
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