Answer:
D. Catalysts speed up the rate of reactions by lowering the amount of energy required for the reaction to proceed.
Explanation:
A catalyst is a substance that:
- speeds up the rate of a reaction .
- does not alter the products of the reaction .
- is unchanged chemically and in mass at the end of the reaction.
<em>A catalyst provides an alternative reaction pathway that has a lower activation energy than the uncatalyzed reaction. </em>
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The figure shows how the energy of the reactants and products change during a reaction.
To find the number of electrons in a neutral gold atom look at it's atomic number. The atomic number is the number of protons in the element. For an atom to be neutral it needs the same number of electrons as protons, therefore the positive and negative charges will be balanced out. Gold's atomic number is 79 therefore it has 79 electrons.
