GCSE Chemistry - Chemical Changes - 1 - Exam Style Questions with Answers

Created on January 23, 2023 By

paruppts12

GCSE_EDE_CHE_3_CHE CHANGE_1

1 / 10

Hydrochloric acid reacts with solid B. Solid B is an alkali.
A student carries out an experiment to see how the pH changes when different masses of solid B are added to dilute hydrochloric acid. The student uses the following method.
step 1 use a measuring cylinder to measure out 100 cm3 of dilute hydrochloric acid
step 2 pour the acid into a beaker
step 3 measure the pH with a pH probe
step 4 add half a spatula of solid B and stir
step 5 repeat steps 3 and 4 until the pH stops changing.

What is the most likely change in pH during the experiment?

from 12 to 1

from 7 to 12

from 1 to 12

from 1 to 7

2 / 10

C

D

A

B

3 / 10

Hydrogen is given off when magnesium reacts with acid.
The hydrogen is tested by collecting the gas in a test tube and igniting it.
What is the safest way to ignite the gas?

put a lighted splint at the open end of the test tube

add fuel to the test tube

heat the test tube with a Bunsen burner

put the test tube in an oven

4 / 10

During the experiment the pH changes from 2 to 10. If phenolphthalein indicator is added at the beginning of the experiment, a colour change occurs as the base is added.
State the colour change that occurs.
colour at start ........................
colour at end ..................................

Start :pink ; end at colourless

Start :clear solution ; end at pink

Start : colourless; end at pink

5 / 10

C

A

B

6 / 10

An acid reacts with an alkali.
Give the name of this type of reaction. ………………………….

both A and B

exothermic

endothermic

neutralisation

7 / 10

C

B

A

8 / 10

higher by a factor of 4.40/3.30

ten times higher

ten times lower

lower by a factor of 3.30/4.40

9 / 10

The reactivity of copper, magnesium and zinc was investigated. Each metal was placed separately in dilute hydrochloric acid. The amount of effervescence was observed.

The same mass of metal was used in each experiment.
Which piece of apparatus should be used to find the mass of metal used?

a thermometer

a pipette

a balance

a stopwatch

10 / 10

oxidising

toxic

flammable

health hazard

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