Chemistry A Unit 4 Practice Test

Front

Elements in the same column of the periodic table have the same number of ______.

Back

Valence Electrons

Front

If an atom gains two electrons, what charge will it have?

Back

-2

Front

When ice melts to water, energy is ___ and the process is ___.

Back

absorbed; endothermic

Front

Granite is an igneous rock that contains minerals like quartz and feldspar. Granite is a(n) _______.

Back

heterogeneous mixture

Front

Dry ice is solid carbon dioxide (CO2). Dry ice is a ___________________.

Back

compound

Front

What is the definition of a compound?

Back

A substance formed when two or more elements are chemically bonded together.

Front

What is the definition of a heterogeneous mixture?

Back

A mixture in which the composition is not uniform throughout.

Front

What is the definition of valence electrons?

Back

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

Front

What happens to energy during an endothermic reaction?

Back

Energy is absorbed from the surroundings.

Front

What is the charge of an atom that loses one electron?

Back

+1