Big Idea 8 & 9 Mixtures and Dissolving Quiz

What is a mixture?

• A combination of substances that are only liquids

• A combination of substances that cannot be separated

• A combination of substances that form a new substance

• A combination of substances that maintain their original properties

How can a mixture of sand and rocks be separated?

• By heating the mixture

• By dissolving in water

• By using a magnet

• By picking the rocks out or using a sieve

What is a sieve used for?

• To dissolve solids in liquids

• To separate magnetic materials

• To separate larger particles from smaller ones

• To mix substances together

Which method can be used to separate a mixture of iron paper clips and rubber erasers?

• Using a magnet

• Heating the mixture

• Using a sieve

• Dissolving in water

What happens when a solid substance dissolves in water?

• It forms a gas

• It forms a new substance

• It changes color

• It becomes invisible because the particles are too small to see

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Which of the following is NOT a way to speed up the dissolving rate of a solid in water?

• Increasing the surface area of the solid

• Stirring the solution

• Adding heat

• Cooling the water

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How can you increase the surface area of a solid substance to speed up its dissolving rate?

• By stirring it

• By crushing it into smaller pieces

• By cooling it

• By heating it

What is the result of leaving a sugar and water solution out in the Sun?

• The sugar will dissolve further

• The sugar will evaporate

• The water will evaporate, leaving the sugar behind

• Both the sugar and water will evaporate

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Which of the following mixtures can be separated by color?

• A mixture of salt and water

• A mixture of iron filings and sand

• A mixture of M&Ms

• A mixture of sand and rocks

What type of change occurs when substances are combined to form a mixture?

• Chemical change

• Physical change

• Biological change

• Nuclear change