Unit 1 CBA Review

What statement below is true of the beaker illustrated in the diagram?

• The object has the lowest density.

• Water is more dense than oil.

• The object is more dense than oil.

• Oil has the highest density.

A tablespoon of a substance is added to warm water and stirred. The result was that the substance could no longer be seen. We can conclude from the results that the substance –

• is less dense than water

• heated the water

• dissolved in the water

• flavored the water

What tool would best help you sort iron bolts from aluminum bolts?

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The metal cube and the plastic cube shown are the same size. Compared with the plastic cube, the metal cube is -

• denser

• lighter in weight

• a poorer conductor

• more buoyant

Which of these would be the best choice if you wanted a good conductor of electricity?

• glass tubing

• copper tubing

• plastic tubing

• clay tubing

A root beer float has ice cream, root beer, and carbonation. A root beer is an example of -

• a stable mixture

• a good conductor

• a solid, a liquid, and a gas

• several different kinds of liquids

Maryssa put butter on each spoon. Then she filled the cup with hot water. Why did the butter on the metal spoon melt first?

• Water soaks into wood but not metal.

• The metal spoon is shorter than the wooden spoon.

• Heat moves through metal better than through wood.

• Butter sticks to wood but not to metal.

Which of these is true about a solution?

• A solution is always a liquid.

• The substances in a solution cannot be separated.

• A solution is always a mixture.

• Both substances in a solution are easy to see.

What physical property of salt changes when it is dissolved in water?

• color

• state of matter

• taste

• size

How could you most easily separate a mixture of salt and pepper?

• Put the mixture in water, stir, and strain the water through a coffee filter.

• Pour the salt and pepper through a sieve.

• Heat the salt and pepper.

• Pick out the grains of salt.