What does a catalyst do when added to a chemical reaction? Select all that apply.

Chemistry

2 answers:

Darina [25.2K]2 years ago

8 0

Answer:

$\boxed {\boxed {\sf It \ lowers \ the \ activation \ energy \ and \ it \ speeds \ up \ chemical \ reactions }}$

Explanation:

A catalyst is a substance that increases the rate of a chemical reaction. Some examples are enzymes and acid-base catalysts.

They can do this by lowering activation energy (the energy needed to undergo a reaction) or modifying a certain mechanism in the reaction.

Catalysts are unique because they aren't consumed or used up in a reaction. They can be reused many times.

So, based on the information above, catalysts do not increase the activation energy or get consumed in the reaction. That leaves two correct answers: they lower the activation energy and speed up chemical reactions.

Stels [109]2 years ago

7 0

Answer:

It increases the activation energy.

It speeds up chemical reactions.

Explanation:

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Equal volumes of two solutions, one containing a strong acid at pH 2 and the other containing a strong base at pH 12, are mixed.

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Answer:

Explanation:

Assume we have 1 L of each solution.

Solution 1

$\text{[H$^{+}$]}= 10^\text{-pH} \text{ mol/L} = 10^{\text{-2}} \text{ mol/L}\\ \text{ moles of H}^{+} = \text{ 1 L solution} \times \dfrac{10^{-2}\text{ mol H}^{+}}{\text{1 L solution}} = 10^{-2}\text{ mol H}^{+}$

Solution 2

pH = 12

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$\text{[OH$^{-}$]}= 10^\text{-pOH} \text{ mol/L} = 10^{\text{-2}} \text{ mol/L}\\ \text{ moles of OH}^{-} = \text{ 1 L solution} \times \dfrac{10^{-2}\text{ mol OH}^{-}}{\text{1 L solution}} = 10^{-2}\text{ mol OH}^{-}$