Is a substance that speeds up the rate of a chemical reaction

catalyst

Explanation:

Catalyst -

It is the substance that may be added to a chemical reaction , which increases the rate of the reaction , without undergoing on its chemical structure , is referred to as a catalyst.

The catalyst does not participate in the reaction, it only plays it role regarding the rate of the reaction.

Hence , the correct term for the given statement of the question is catalyst.

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the study of the surface of a large voluptuous cock.

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percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally