IGCSE Chemistry Extended 12.1 Experimental design Topic Practice

Substances can be classified as elements, compounds or mixtures.

A student suggested that the apparatus shown could be used to separate the mixture of alcohols.

Suggest why a Bunsen burner is not used to heat the flask.

This question is about states of matter.

A solution is a mixture of a solute and a solvent.

Name the process when a solid substance mixes with a solvent to form a solution.

A student mixes $25 \mathrm{~cm}^{3}$ samples of dilute hydrochloric acid with different volumes of aqueous sodium hydroxide.

In each case, the student measures the change in temperature to test if the reaction is exothermic.

Which piece of apparatus is not needed?
A
C
D

burette
B
B

clock

pipette

thermometer

During an experiment a measurement is recorded in $\mathrm{cm}^{3}$.
Which apparatus is used?

A student measures the time taken for 2.0 g of magnesium to dissolve in $50 \mathrm{~cm}^{3}$ of dilute sulfuric acid.

Which apparatus is essential to complete the experiment?
1 stop-clock
2 measuring cylinder
3 thermometer
4 balance

A student put exactly $25.00 \mathrm{~cm}^{3}$ of dilute hydrochloric acid into a conical flask.
The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture.

Which apparatus does the student need to use?

A student put exactly $25.00 \mathrm{~cm}^{3}$ of dilute hydrochloric acid into a conical flask.
The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture.

Which apparatus does the student need to use?

Which piece of apparatus is used to measure $13.7 \mathrm{~cm}^{3}$ of dilute hydrochloric acid?

$225 \mathrm{~cm}^{3}$ of an alkali are added to $20 \mathrm{~cm}^{3}$ of an acid. The temperature change is measured. Which apparatus is not needed in the experiment?

A student measures $25.00 \mathrm{~cm}^{3}$ of dilute hydrochloric acid accurately.
Which apparatus is most suitable?