Big Idea 8 & 9 (PMA review)

Kyle and Jan are comparing two samples of matter. They make a table of the properties of each sample.

Which property provides the best evidence that both samples are solids rather than liquids?

• mass

• Color

• Shape

• Volume

Which of the following must be true for scientific results to be valid?

• The results should be drawn in a graph.

• The results should be based on evidence.

• The results should support the ideas of other scientists.

• The results should match the predictions of the scientist.

Jerome put water in the freezer and made ice. Which of the following happened?

A.

B.

C.

D.

• Water physically changed from a solid to a liquid.

• Water physically changed from a liquid to a solid.

• Water chemically changed from a solid to a liquid.

• Water chemically changed from a liquid to a solid.

When Elsa placed a substance into a container it was round and had a volume of one liter. When she

placed the same substance in a much larger container it was now rectangular, but still had a volume of

one liter.

What state of matter is the substance in?

• gas

• solid

• liquid

• evaporated

Which of the following describes an example of a material undergoing a chemical change to become

another material with different characteristics?

• Iron turns to rust when it is exposed to oxygen.

• When water boils, it turns into vapor, which is a gas.

• Oxygen can become liquid at a very low temperature.

• Gold can be spread out very thin to cover a large area.

LaMont was preparing for a visit to his grandfather’s house, and was planning on eating a banana for a snack before leaving. It took him longer than expected to pack, and he didn’t get a chance to eat the banana before he had to leave his house. LaMont didn’t want the banana to rot, so he placed it in the freezer before leaving. Which of these statements best explains why LaMont placed the banana in the freezer?

• Chemical changes happen only if the temperature is very hot.

• Chemical changes are not affected by a change in temperature.

• Chemical changes generally happen faster at lower temperatures.

• Chemical changes generally happen slower at lower temperatures.

Maria stirred salt in water causing the salt to dissolve. She placed the cup of the salt water on a windowsill. She observed the cup for two days. Which of the following would correctly indicate the change that occurred?

• A chemical change because a new substance was formed.

• A physical change because the water condensed leaving the salt behind.

• A physical change because the water evaporated leaving the salt behind.

• A chemical change because the water evaporated leaving the salt behind.

Becky is doing an experiment to find out whether mold grows faster on specific types of yogurt. She has four different types of yogurt. She places them out on the same counter. Every day, Becky examines each yogurt for signs of mold growth. She then records her observations.

Which variable is Becky changing in the experiment?

• the type of mold

• the type of yogurt

• the amount of light each yogurt receives

• the amount of time each yogurt is left out

Mass and volume are two properties that can be used to describe matter. Which of the following statements describes what you observe about the mass and volume of the two objects on the balance below?

• Both objects have the same mass, but Object B has more volume.

• Both objects have the same volume, but Object B has more mass.

• Both objects have the same mass, but Object A has more volume.

• Both objects have the same volume, but Object A has more mass.

Which of the following will result in a substance with new chemical property?

• cutting wood

• shredding a newspaper

• roasting marshmallows

• boiling water evaporating