Chemistry

Question 1

1A common unit for the rate of a reaction is

Easy

A. mol dm⁻³ s⁻¹ B. g cm⁻³ C. kJ mol⁻¹ D. K

Question 2

2The rate of a reaction can be measured by recording the

Easy

A. room size B. colour of the beaker C. shape of the flask D. volume of gas produced over time

Question 3

3Powdered chalk reacts faster with acid than lumps of chalk because the powder has

Easy

A. a higher temperature B. a catalyst C. less mass D. a larger surface area

Question 4

4If doubling [A] quadruples the rate, the reaction is

Hard

A. second order in A B. third order C. first order D. zero order

Question 5

5A catalyst speeds up a reaction by

Easy

A. increasing the temperature B. changing the products C. providing a route with lower activation energy D. being used up

Question 6

6Raising the temperature increases the rate of reaction mainly because

Easy

A. more particles collide with energy above the activation energy B. fewer collisions occur C. particles become heavier D. the volume decreases

Question 7

7For a zero-order reaction, the rate

Hard

A. does not depend on reactant concentration B. is zero always C. quadruples D. doubles when concentration doubles

Question 8

8The half-life of a first-order reaction

Hard

A. doubles each time B. is zero C. is independent of the initial concentration D. depends on volume

Question 9

9Powdered calcium carbonate reacts faster with acid than lumps because it has

Easy

A. more mass B. a higher temperature C. a larger surface area D. less acid

Question 10

10Food lasts longer in a refrigerator because low temperature

Easy

A. speeds up reactions B. adds oxygen C. kills all bacteria D. slows down reactions