Naming Covalent Compounds — Unit test Answers

Which refers to the chemical name for NO2?

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

When looking at the chemical symbol, the charge of the ion is displayed as the

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

What prefix should be used for the oxygen atom when naming the chemical formula SO2?

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?

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

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

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?

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.

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 statement is a description of Charles’s law?

Sodium and phosphorus combine to form Na3P. What is the name of this compound?

While researching scuba diving, Pablo reads how hot a tank should get while being filled with air. Which law best explains why the scuba tank would heat up?

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.

A __________ at the bottom right side of a chemical symbol represents the number of each type of ion in the chemical formula of an ionic compound.Which best completes the statement?

Which is most likely a physical change?

Calcium has a charge of +2. The chart lists the charges of different ions.