A chemist has two compounds that do not chemically react. He thinks that by finding the right catalyst, he can get them to react
. Why is the chemist incorrect? A. Catalysts can only increase the rate of reaction for compounds that do react. B. Only an inhibitor can cause two compounds to react.
C. The activation energy of the reaction is already zero.
D. A catalyst cannot increase the concentration of reactants.
Answer: oprion <span>A. Catalysts can only increase the rate of reaction for compounds that do react. </span>
Explanation:
Such as the right choice states a catalyst cannot make react two materials that cannot chemically react.
The catalysts modify the rate (speed) of a reaction between chemicals.
The definition of catalyst is a substance that increases the speed of a chemical reaction by modifying the activation energy but that is not consumed in the reaction.
Then three facts must be highlithed about catalyst:
1) Catalysts are not included in the chemical equation since they do not increase the amount of product that can be obtained (they do not change the theoretical yield of the reaction).
2) Catalysts change the path that the reactants take to yield the products, which is how the energy activation is changed.
3) As consequence, catalysts are not consumed during the reaction.
The computation for this problem is: (1.55x10^4 / 1.0x10^3) x 19.8 mm Hg = 15.5 x 19.88 mm Hg = 308.14 mm Hg decrease = 308.14 x 0.05 C = 15.407 deg C deduct this amount to 100 100 – 15.407 = 84.593 C ANSWER: 85 deg C (rounded to 2 significant figures)
When liquid water reaches the freezing point, it expands. After placing a sealed glass container full of water into the freezer, we might expect it to freeze, expand, and either crack or shatter the glass.
