Chemistry Midterm Review

Front

What is the sum of 67 seconds and 10.1 seconds?

Back

77 seconds

Front

Which of the following is the correct way to write a chemical formula?

Back

D

Front

What characteristic do gases have?

Back

Gases have fast-moving particles.

Front

What happens to an atom when it loses a valence electron?

Back

It becomes a positive ion.

Front

How do you calculate the density of an object?

Back

Density = Mass/Volume.

Front

What is the density of a box measuring 20 cm x 8 cm x 14 cm with a mass of 226.8 g?

Back

0.101 g/cm³

Front

Define 'valence electron'.

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is the difference between an ionic bond and a covalent bond?

Back

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Front

What is the law of conservation of mass?

Back

The law states that mass is neither created nor destroyed in a chemical reaction.

Front

What is the pH scale used for?

Back

The pH scale measures the acidity or basicity of a solution.