What does catalase do? Use the terms substrate and product in your response.

Answers

Answer 1

Answer: Catalase is an enzyme found in almost all living organisms exposed to oxygen. This catalyzes the decomposition of hydrogen peroxide. The substrate would be the hydrogen peroxide and the products are water and oxygen.

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There are three stable atoms of Argon (Atomic Number 18): Argon-36, Argon-38 andArgon-40. What would the atoms of these isotopes have in common? What would be different about their atoms? (4 points) HELP ASAP
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Which of the following pairs share the same empirical formula? Select one: a. CH4 and C2H4 b. PbCl2 and PbCl4 c. N2O5 and NO2 d. C2H6 and C4H12

Which statement correctly describes diamond and graphite, which are different forms of solid carbon?(1) They differ in their molecular structure, only.
(2) They differ in their properties, only.
(3) They differ in their molecular structure and properties.
(4) They do not differ in their molecular structure or properties.

Answers

Answer: Option (3) is the correct answer.

Explanation:

When an element exists in two or more different physical forms then they are known as allotropes.

For example, diamond and graphite are both allotropes of carbon.

In graphite, carbon atoms are joined together in sheets of six sided lattice. Whereas in diamond, carbon atoms are joined together in four cornered lattice.

Therefore, as these allotropes are made up of same element so they have similar chemical properties but different physical properties like melting point, boiling point etc.

Also, both of them have different molecular structure.

Thus, we can conclude that the statement the differ in their molecular structure and properties correctly describes diamond and graphite.

They differ in their molecular structures and properties.

Propane (C3H8) reacts with oxygen gas to produce carbon dioxide & water. How many grams of oxygen are needed to oxidize 12.5g of propane (C3H8)? a) 1.8

b) 22.7

c) 55.6

d) 31.8

e) 45.5

Answers

The amount of oxygen needed to oxidize 12.5g of propane is 45.5g.

What is stoichiometry in chemistry?

Stoichiometry is the calculation of the quantitative relationships between the amounts of reactants and products in chemical reactions.

The balanced chemical equation for the combustion of propane is:

C3H8 + 5O2 → 3CO2 + 4H2O

To calculate the amount of oxygen needed to react with 12.5g of propane, we need to use stoichiometry and the molar mass of propane. The molar mass of propane is 44.1 g/mol.

First, we need to convert the mass of propane to moles:

12.5 g C3H8 × (1 mol C3H8 / 44.1 g C3H8) = 0.283 mol C3H8

According to the balanced equation, 5 moles of oxygen are required to react with 1 mole of propane. So, we can calculate the amount of oxygen needed as follows:

0.283 mol C3H8 × (5 mol O2 / 1 mol C3H8) = 1.415 mol O2

Finally, we can convert the moles of oxygen to grams using the molar mass of oxygen, which is 32.0 g/mol:

1.415 mol O2 × 32.0 g O2/mol = 45.1 g O2

Therefore, the answer is e) 45.5 g of oxygen is needed to oxidize 12.5g of propane (C3H8).

Learn more about Stoichiometry here:

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In a calcium atom in the ground state, the electrons that possess the least amount of energy are located in the(1) first electron shell
(2) second electron shell
(3) third electron shell
(4) fourth electron shell

Answers

According to the electronic configuration, a calcium atom in the ground state electrons which possess least amount of energy are located in first shell.

What is electronic configuration?

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elementshave valence shell complete in ground state and hence are said to be stable.

According to the electronic configuration,as the number of shells increases their energy also increases .Hence, electrons in first shell have least energy.

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Answer:

Explanation:

first electron shell.

First electron shell possesses the least amount of energy at the core.

Hope this helps.

What clues indicate a rusty bike has gone through a chemical change

Answers

That bike is certainly made of iron. And when iron comes in contact with oxygen, it rusts. Well, a chemical change occurs! It is rusty, the red marks clearly show that - so, this is the evidence that the bike has gone through a chemical change. There is plenty of oxygen in the air so the bike has to rust.

That the color isn't the same because it has rust, it will be now dark red or even green.

What is inferring means in science

Answers

It means to conclude information from evidence and reasoning rather than from statements.

Calculate the number of ATOMS in 1.0 mole of O2.

Answers

Answer: The number of atoms in given amount of oxygen gas is $6.022* 10^(23)$

Explanation:

According to the mole concept:

1 mole of a substance contains $6.022* 10^(23)$ number of atoms.

We are given:

Moles of oxygen gas = 1 mole

So, the number of atoms that will be present in 1 mole of oxygen gas will be $1* 6.022* 10^(23)=6.022* 10^(23)$ number of atoms.

Hence, the number of atoms in given amount of oxygen gas is $6.022* 10^(23)$

There is 6.02*10^23 molecule per mole. And there is 2 atoms per oxygen molecule. So the answer is 1.204*10^24 atoms in 1.0 mole of O2.

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