Mixtures — Unit test Answers

The descriptions below explain two ways that water is used by plants on a sunny day.I. In a process called transpiration, some liquid water in leaves changes to water vapor. The water vapor is released into the air through tiny pores in the leaves. This allows more liquid water from the soil to be pulled up the roots and stem to replace water lost from the leaves.II. Plants use some of this water in leaves in a process called photosynthesis. During photosynthesis, water and carbon dioxide break apart and recombine to form two new substances, oxygen and glucose.

Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred.

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.

Which best describes solubility?

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?

Which describes a homogeneous mixture?

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

Carla is making two drinks. She is making one hot chocolate and one chocolate milk. Which best describes the agitation needed to make sure the cocoa powder is mixed in well?

Which best describes a mixture?

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?

The density of solid aluminum is 2.70 g/cm3. If a 1g piece of aluminum is dropped in a cup of water, what will happen to the aluminum? (The density of water is 1.00 g/cm3.)

Which is most likely a physical change?

Which would show an example of how physical changes are reversible?

Which property describes a mixture?

Which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (HCl) solution?

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?

Which describes a feature of the physical changes of all substances?

During which change of state do atoms lose energy?

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.

Which lists mixtures, in order, from the smallest particles to the largest particles?