CA1 Term 1 2021 Chemistry MCQ

The changes that occur when a substance changes state are shown above.

Which process, W, X,Y or Z, is occurring in the following four situations?

W. Butter melts on a warm day.

X. Water condenses on a cold surface.

Y. The volume of liquid ethanol in an open beaker reduces.

Z. Ice forms inside a freezer.

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The particles of a substance gain energy and change from a regular ordered structure to a disordered structure with large distances between the particles.

Which change of state is described?

• boiling

• evaporation

• melting

• sublimation

Which statement is an example of diffusion?

• A kitchen towel soaks up some spilt milk.

• Ice cream melts in a warm room.

• Pollen from flowers is blown by the wind.

• The smell of cooking spreads through a house.

Diagrams X, Y and Z represent the three states of matter.

• X to Y

• Y to Z

• Z to X

• Z to Y

The four pieces of apparatus shown below are used in chemical experiments.

Which statement about the apparatus is correct?

• The burette measures the volume of liquid added in a titration.

• The measuring cylinder measures the mass of a substance used in an experiment.

• The pipette measures the volume of gas given off in a reaction.

• The thermometer measures the density of a solution.

Alcohol and water are completely miscible (mixed completely). This means when mixed together they form only one liquid layer.

Which method is used to separate alcohol from water?

• crystallisation

• filtration

• fractional distillation

• precipitation

A student uses the apparatus shown in the diagram below to measure the volume of carbon dioxide gas made when different masses of marble chips are added to 25 cm³ of dilute hydrochloric acid.

Which other items of apparatus are needed?

• funnel and balance

• funnel and stopwatch

• measuring cylinder and balance

• measuring cylinder and stopwatch

Chromatography is a technique used to separate coloured dyes.

Which dye has an Rf value of 0.7?

(a)  

Gases are separated from liquid air by fractional distillation.

The boiling points of four gases are shown.

Which gas is both monatomic and a liquid at –200^oC?

(a)  

A mixture is separated using the apparatus shown.

What is the mixture?

• aqueous copper chloride and copper

• aqueous copper chloride and sodium chloride

• ethane and methane

• ethanol and water