Spot the false claim

Exercise and reference answers

Questions

1. False statement

   A reaction runs at exactly the same rate from start to finish.

   Statements

   1. A reaction runs at exactly the same rate from start to finish.
   2. A reaction rate measures how much reactant is used up in a given time.
   3. Reaction rates are written as positive quantities by convention.

2. False statement

   A rate law can be read straight off the coefficients of a balanced equation.

   Statements

   1. Rate laws are settled by experiment, never by stoichiometry alone.
   2. A rate law can be read straight off the coefficients of a balanced equation.
   3. The rate constant k changes when the temperature changes.

3. False statement

   A catalyst shifts the position of equilibrium in its own favour.

   Statements

   1. The slowest elementary step sets the rate of the whole reaction.
   2. A catalyst speeds the forward and the reverse reaction alike.
   3. A catalyst shifts the position of equilibrium in its own favour.

4. False statement

   The half-life of a zero order reaction ignores the starting concentration.

   Statements

   1. The half-life of a zero order reaction ignores the starting concentration.
   2. The half-life of a first order reaction ignores the starting concentration.
   3. The half-life of a second order reaction grows as the reaction runs on.

Instructions

Tap the one statement in each set that is not true.

Explanation