Lab: Physical and Chemical Changes — Unit test Answers

During which change of state do atoms lose energy?

Three grams of the same substance in different phases are stored in three different containers. Each container is barely large enough to hold the substance.Which statement can be known about the behavior of the atoms in each container?

Rahul sees a flock of birds. He watches as the flying birds land in neat little rows on several power lines. Which change of state does the motion of the birds most closely model?

Sari is studying four different samples of materials. This table shows the mass and volume of the samples.

Which statement describes an intensive property of matter?

A student is using a copper strip and a strong chlorine solution in her experiment. Which of these is a chemical property of one of her materials?

Which process is a chemical change?

Venn diagrams are used for comparing and contrasting different topics. The overlapping sections show characteristics that the topics have in common, and the sections that are unique to each topic show the characteristics apply to only that topic.

The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.

A substance occupies one half of an open container. The atoms of the substance are closely packed but are still able to slide past each other.What is most likely the phase of the substance?

Which is the process by which a gas changes to a solid?

Carmen has a sample of matter. It is clear and smells sour. The sample is also thick but it flows when poured.Which is the best conclusion about Carmen’s sample?

Which liquid is the most viscous?

Mercury’s natural state is where the atoms are close to each other but are still free to pass by each other. In which state(s) could mercury naturally exist?

A student investigated some properties of lead and recorded the findings in the table below.PropertyObservationcolordull graydensity11.3 g/cm3volume of sample3.00 cm3melting point327°Creaction with airlead oxide forms on the surfaceelectrical conductivityconducts some electricityWhich statement is true with respect to the investigation?

To observe a [BLANK] property of a substance, the substance must interact with another substance, such as when gasoline burns or when sodium metal reacts with water.

Which of these is an example of a physical change?

A cylinder at left with balls evenly spaced throughout the cylinder with an arrow leading to a cylinder at right with balls stacked near the bottom of the cylinder.

A geochemist examines a piece of metal that he found in the soil. He performs tests to identify the metal from its density, electrical conductivity, and melting point. Which statement best describes his investigation?

A cylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls stacked near its bottom.