Chemistry Semester 1 Review

Front

When atoms absorb energy, what happens to their electrons?

Back

Electrons go up energy levels.

Front

What is the SI unit of mass?

Back

kg

Front

Add and round to the correct number of sig figs: 200.6 + 33.333

Back

233.9

Front

What state is an atom in when all electrons are in the lowest possible energy levels?

Back

Ground state.

Front

Light is a type of ___ radiation.

Back

Electromagnetic.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

Define an ion.

Back

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

Front

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

Back

An ionic bond is formed through the transfer of electrons, while a covalent bond is formed through the sharing of electrons.

Front

What is the pH scale used for?

Back

To measure the acidity or basicity of a solution.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.