CHEM Midterm Study Guide

Front

What happens to the energy of a substance during a phase change from solid to gas?

Back

The amount of energy increases.

Front

What is the defining characteristic that differentiates two atoms of different elements?

Back

They have different numbers of protons.

Front

How many neutrons are present in a phosphorus atom?

Back

16 neutrons.

Front

What occurs during nuclear fission?

Back

A nucleus divides.

Front

How many electron shells does an atom with 3 shells have?

Back

3 electron shells.

Front

What is the process called when a solid turns directly into a gas?

Back

Sublimation.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the significance of the number of neutrons in an atom?

Back

It determines the isotope of the element.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

They are equal in number.

Front

What is the main product of nuclear fission?

Back

Energy and smaller nuclei.