Unit Test — Unit test

Question 1

Which is the only element in group 1 on the periodic table that forms covalent bonds?

Revolt · Accepted Answer

hydrogen

Question 2

An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change?

Revolt · Accepted Answer

The density changed.

Question 3

How do the nuclei of covalently bonded atoms help keep the bond together?

Revolt · Accepted Answer

Positive particles in the nucleus are attracted to shared electrons, so the atoms stay close together.

Question 4

Which best describes the behavior of atoms in a solid substance that is melting into a liquid?

Revolt · Accepted Answer

Atoms that were once in fixed positions now slide past one another.

Question 5

Which example illustrates a chemical change?

Revolt · Accepted Answer

burning wood

Question 6

During which changes of state do atoms that cannot move past one another become free to move?

Revolt · Accepted Answer

sublimation and melting

Question 7

A gas has an initial volume of 2.5 L at a temperature of 275 K and a pressure of 2.1 atm. The pressure of the gas increases to 2.7 atm, and the temperature of the gas increases to 298 K.

Revolt · Accepted Answer

2.1 L

Question 8

Ella makes this table to organize her notes on whether atoms gain or lose energy during the changes of state.

Revolt · Accepted Answer

freezing, deposition, and condensation

Question 9

What is a limitation of using a chemical formula, such as C6H12O6, to represent a compound?

Revolt · Accepted Answer

The chemical formula does not show how the atoms are connected to one another.

Question 10

Which formula represents Charles’s law?

Revolt · Accepted Answer

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Unit Test — Unit test Answers

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