Chemistry Final

Front

Atoms of the same element must always have the same number of _________

Back

protons

Front

What is the charge of a proton?

Back

Positive

Front

What safety equipment must you wear when working with an open flame in the lab?

Back

goggles, gloves, apron

Front

All chemicals in the lab are to be considered dangerous. True or False?

Back

True

Front

Sodium has 11 protons, 11 electrons, and 12 neutrons. What is its mass number?

Back

23

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

Define isotopes.

Back

Atoms of the same element that have different numbers of neutrons.

Front

What is the charge of an electron?

Back

Negative

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.

Front

What is a chemical reaction?

Back

A process that involves the rearrangement of the molecular or ionic structure of a substance.