Midterm Topic Review

Front

What is the term for the time needed for half of a radioactive sample to decay?

Back

Half-life

Front

What happens to the energy when changing a substance from gas to liquid?

Back

The energy has to DECREASE.

Front

TRUE or FALSE: Gases have the least kinetic energy out of all 3 states of matter.

Back

FALSE

Front

If a substance has 7 protons, 6 neutrons, and a mass of 13, how many electrons does it have if the charge is -2?

Back

9

Front

Which compound has both ionic and covalent bonds?

Back

MgSO4

Front

What is the definition of half-life in radioactive decay?

Back

The time required for half of the radioactive atoms in a sample to decay.

Front

What is the process called when a gas turns into a liquid?

Back

Condensation

Front

What is the kinetic energy of solids compared to liquids and gases?

Back

Solids have the least kinetic energy.

Front

What is the charge of an atom with 7 protons and 9 electrons?

Back

-2

Front

What type of bond is formed when electrons are shared between atoms?

Back

Covalent bond