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3 years ago

Why are enzymes considered catalyst?

1 answer:

8 0

A catalyst is a chemical that increases the rate of a chemical reaction without itself being changed by the reaction. The fact that they aren't changed by participating in a reaction distinguishes catalysts from substrates, which are the reactants on which catalysts work. Enzymes catalyze biochemical reactions.

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Identify each of the following reactions as balanced or unbalanced. CH4+ 2O2 → CO2 + 2H2O: CaCl2+ 2AgNO3 → Ca(NO3)2 + 2AgCl: 3Fe

kap26 [50]

1) The answer is: chemical reaction is balanced.

Chemical reaction: CH₄ + O₂ → CO₂ + H₂O.

Oxidation reaction: C⁻⁴ → C⁺⁴ + 8e⁻.

Reduction reaction: O₂ + 4e⁻ → 2O⁻² /×2; 2O₂ + 8e⁻ → 4O⁻².

Balanced chemical reaction: CH₄ + 2O₂ → CO₂ + 2H₂O.

Carbon change oxidation number from -4 to +4 (oxidation) and oxygen change oxidation number from 0 to -2 (reduction).

2) The answer is: chemical reaction is balanced.

Balanced chemical reaction: CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl.

Number of atoms must be the same on left and right side of balanced chemical reaction according to the law of conservation of mass or principle of mass conservation.

There are two chlorine atoms (Cl), one calcium atom (Ca), six oxygen atoms (O), one nitrogen atoms (N) and two silver atoms (Ag) in this balanced chemical reaction.

3) The answer is: chemical reaction is unbalanced.

Chemical reaction: 3Fe₃O₄ + 4Al → 9Fe + 4Al₂O₃.

Number of aluminium atoms (Al) is unbalanced. There are four aluminium atoms on the left and eight aluminium atoms on right side of chemical reaction.

Balanced chemical reaction: 3Fe₃O₄ + 8Al → 9Fe + 4Al₂O₃.

According to principle of mass conservation, number of atoms must be equal on both side of chemical reaction.

8 0

3 years ago

Read 2 more answers

What is the percentage of water in the hydrate cocl2 • 6h2o

lord [1]

Answer:

52.17%

Explanation:

COCl2.6H20

C=12,O=16,Cl=35.5,H=1

Relative molecular mass of COCl2.6H2O= 12+16+71+6(2+16) = 99 + 108= 207g

Relative molecular mass of 6H2O = 108g

Percentage of water = (108/207 )*100

= 52.17%

8 0

2 years ago

The basic principle of energy is:

nevsk [136]

Answer:

3) Neither created nor destroyed. Only converted.

Explanation:

8 0

2 years ago

What forces are important in the creation of magma?

kherson [118]

"the factors that mainly affect in the formation of magma can be summarized into three: temperature, pressure, and composition"

I hope this helps =^._.^=

4 0

3 years ago

A student ran the following reaction in the laboratory at 671 K: 2NH3(g) N2(g) + 3H2(g) When she introduced 7.33×10-2 moles of N

vaieri [72.5K]

Answer:

Kc = 8.05x10⁻³

Explanation:

This is the equilibrium:

2NH₃(g) ⇄ N₂(g) + 3H₂(g)

Initially 0.0733

React 0.0733α α/2 3/2α

Eq 0.0733 - 0.0733α α/2 0.103

We introduced 0.0733 moles of ammonia, initially. So in the reaction "α" amount react, as the ratio is 2:1, and 2:3, we can know the moles that formed products.

Now we were told that in equilibrum we have a [H₂] of 0.103, so this data can help us to calculate α.

3/2α = 0.103

α = 0.103 . 2/3 ⇒ 0.0686

So, concentration in equilibrium are

NH₃ = 0.0733 - 0.0733 . 0.0686 = 0.0682

N₂ = 0.0686/2 = 0.0343

So this moles, are in a volume of 1L, so they are molar concentrations.

Let's make Kc expression:

Kc= [N₂] . [H₂]³ / [NH₃]²

Kc = 0.0343 . 0.103³ / 0.0682² = 8.05x10⁻³

3 0

3 years ago