Chemistry S1 Review (without electron configurations)

Front

How many neutrons does sodium-23 have?

Back

12

Front

In order for an atom to be neutral, what must be true?

Back

The atom has the same number of protons and electrons.

Front

A neutral atom would become an ion that has a charge of 2+ by:

Back

Losing two electrons.

Front

Round 1289 to three significant figures.

Back

1.29x10^3

Front

Which of the following statements is true regarding the particle structure of liquids? Particles of a liquid are:

Back

Relatively close together, so they cannot be easily compressed.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

Define mass number.

Back

The total number of protons and neutrons in an atom's nucleus.

Front

What is an ion?

Back

An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What happens to the volume of a gas when it is compressed?

Back

The volume decreases.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.