Midterm Review

Front

What is the purpose of a control group in an experiment?

Back

Controls are used as a basis for COMPARISON.

Front

How many valence electrons does a Fluorine atom have?

Back

7

Front

What effect does increasing or decreasing thermal energy have on a substance?

Back

It can change its state of matter.

Front

What is the central region of an atom where its neutrons and protons are located?

Back

Nucleus.

Front

Which line segment represents only the solid state?

Back

A-B.

Front

Define 'valence electrons'.

Back

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

Front

What is thermal energy?

Back

The total kinetic energy of particles in a substance.

Front

Explain the term 'state of matter'.

Back

The distinct forms that different phases of matter take on, primarily solid, liquid, gas, and plasma.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of 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.