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IGCSE Chemistry2.37 Acids in waterTopic Practice

2.37 Acids in water

Describe the reactions of hydrochloric acid, sulfuric acid and nitric acid with metals, bases and metal carbonates (excluding the reactions between nitric acid and metals) to form salts

Question 6(b)

[Maximum number: 1]

A student uses the reaction between magnesium and dilute hydrochloric acid to prepare crystals of hydrated magnesium chloride.

The student adds excess magnesium powder to hydrochloric acid.
This is the equation for the reaction.

Mg( s)+2HCl(aq)MgCl2(aq)+H2( g)\mathrm{Mg}(\mathrm{~s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{MgCl}_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})

State one observation made during this reaction.

Question 6(a)

[Maximum number: 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.

Question 7(a)

[Maximum number: 1]

A student investigates the reaction between magnesium and hydrochloric acid.
He uses this method.
Step 1 add 25 cm325 \mathrm{~cm}^{3} of dilute hydrochloric acid to a polystyrene cup
Step 2 record the temperature of the acid
Step 3 find the mass of a 10 cm strip of magnesium ribbon
Step 4 add the magnesium ribbon to the hydrochloric acid
Step 5 when all the magnesium has reacted, record the highest temperature reached

Complete the word equation for the reaction.
magnesium + hydrochloric acid → +

Question 9(a)(ii)

[Maximum number: 1]

A student uses the reaction between zinc powder and dilute nitric acid to prepare some zinc nitrate crystals.

State what the student would observe during this reaction.

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