Front

Chemical equations must be balanced to satisfy ____.

Back

The law of conservation of mass.

Front

Why does a collision with an airbag (a gas-filled bag) hurt less than a collision with a steering wheel (a solid)?

Back

Particles of a gas are spread apart and compressible, while particles of a solid are held firmly in one position.

Front

Charles's law shows the relationship between which two factors of a gas?

Back

Volume and temperature.

Front

What is a positively charged subatomic particle?

Back

Proton.

Front

What do metals likely do in chemical reactions?

Back

Form cations.

Front

What is the law of definite proportions?

Back

A chemical compound contains its component elements in fixed ratio by mass.

Front

What is the definition of a gas?

Back

A state of matter with no fixed shape or volume, where particles are far apart and move freely.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the significance of Avogadro's principle?

Back

It states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules.