1.1. A student uses this method to investigate the reaction of dilute hydrochloric acid with zinc.

• pour some dilute hydrochloric acid into a glass beaker

• record the initial temperature of the acid

• add a piece of zinc and stir the mixture

• record the temperature of the mixture after one minute

Write a word equation for the reaction of dilute hydrochloric acid with zinc.

1.2. The diagram shows the thermometer readings for this reaction.

Complete the table, giving all values to the nearest 0.1 °C.

1.3. Another student repeats the method using five different metals to compare their reactivity.

i) This student uses a polystyrene cup instead of a glass beaker. Explain why a polystyrene cup is better than a glass beaker in this investigation.

(2)

ii) Give three factors that the student should keep constant in this investigation.

(3)

1........................................................................................................2........................................................................................................3........................................................................................................

1.4. The table shows some of the student’s results.

i) State why there is no temperature change for copper.

(1)

ii) Predict the temperature change for iron.

(1)

temperature change = ...................................................................... °C

iii) Deduce the order of reactivity of the five metals.

(1)