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3 years ago

How will the addition of a catalyst affect the reaction rate of the chemical reaction?

Chemistry

2 answers:

slega [8]3 years ago

8 0

Answer:

The correct answer is "It will cause the reaction rate to increase".

Explanation:

A catalyst is defined as a molecule that increases the rate of a reaction without suffering any structural or functional alteration resulted from the reaction. The most common catalysts are called enzymes, which perform hundreds of different chemical and biological reactions. Depending on the reaction, an enzyme can increase the reaction rate up to 100 million times.

Rina8888 [55]3 years ago

3 0

Answer:

It will cause the reaction rate to increase.

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2 years ago

Using the following thermochemical data, what is the change in enthalpy for the following reaction? Ca(OH)2(aq) + HCl(aq) CaCl2(

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Ca(OH)2(aq) + 2HCl(aq)------> CaCl2(aq) + 2H2O(l) ΔH-?

CaO(s) + 2HCl(aq)-----> CaCl2(aq) + H2O(l), ΔH = -186 kJ

CaO(s) + H2O(l) -----> Ca(OH)2(s), ΔH = -65.1 kJ

1) Ca(OH)2 should be reactant, so
CaO(s) + H2O(l) -----> Ca(OH)2(s)
we are going to take as
Ca(OH)2(s)---->CaO(s) + H2O(l), and ΔH = 65.1 kJ

2) Add 2 following equations
Ca(OH)2(s)---->CaO(s) + H2O(l), and ΔH = 65.1 kJ
CaO(s) + 2HCl(aq)-----> CaCl2(aq) + H2O(l), and ΔH = -186 kJ

Ca(OH)2(s)+CaO(s) + 2HCl(aq)--->CaO(s) + H2O(l)+CaCl2(aq) + H2O(l)

Ca(OH)2(s)+ 2HCl(aq)---> H2O(l)+CaCl2(aq) + H2O(l)
By addig these 2 equation, we got the equation that we are needed,
so to find enthalpy of the reaction, we need to add enthalpies of reactions we added.
ΔH=65.1 - 186 ≈ -121 kJ

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