Physical Science

It rained early in the morning. A student sees a puddle of water on the sidewalk when she travels to school. The water in the puddle is gone when she travels home. What happened to the water in the puddle?

• it melted

• it condensed

• it evaporated

• it froze

A block of concrete can be broken into smaller pieces, then into material from which concrete is made, as shown in the diagram below. Concrete is a mixture because it can be ___________.

• separated into different substances.

• crushed into smaller pieces.

• sorted into different colors.

• formed into a large block.

A container of liquid water was placed outside during the day when the temperature was 10 degrees Celsius. At night the outside temperature dropped to -5 degrees Celsius.  This temperature change most likely caused the water to

• condense

• evaporate

• remain a liquid

• become a solid

A student pumps air into a soccer ball. Which statement best explains why the soccer ball changes size?

• The pump increased the amount of space inside the ball.

• The mass of the ball is decreasing as it is pumped up

• The air pumped into the ball is cold.

• Air is matter and takes up space.

Which is an example of a different substance being formed?  A. glass breaking;  B. metal melting;  C. water freezing;  D. wood burning

• glass breaking

• metal melting

• water freezing

• wood burning

A student drops a block of ice onto the floor and the block breaks into many small pieces.  Which statement describes the relationship between the mass of the block of ice and the mass of the small pieces of ice?

• The mass of the block of ice was slightly greater because some of the small pieces melted.

• The mass of the block of ice was less than total mass of the smaller pieces of ice.

• The mass of the block of ice was equal to the total mass of the smaller pieces of ice.

• The mass of the block of ice was greater than the total mass of the smaller pieces of ice.

A scientist uses and instrument to observe the pattern of tightly packed molecules in a substance.  The picture below shows what the scientist sees. What state of matter is the scientist most likely observing?

• gas

• liquid

• vapor

• solid

When making homemade ice cream, salt is added to the ice that surrounds the ice cream chamber. Which property of salt is important when making ice cream?

• Salt conducts electricity in water.

• Salt dissolves in water.

• Salt lowers the freezing point of water.

• Salt adds flavor to the ice cream mixture.

"Flexibility is a physical property of some matter. Which of these materials best demonstrates the property of flexibility?

• a mirror

• a pencil

• a metal wire

• a telephone pole

Which of the following pieces of equipment can be used to separate a mixture of salt water?

• a magnet

• balance

• funnel

• hot plate