Chemistry Midterm Review 2

Front

How many atoms of Oxygen are in Fe(NO₃)₃?

Back

9

Front

What do two atoms with different numbers of protons represent?

Back

Different elements

Front

Find the percent composition of Mg in Mg₃(PO₄)₂.

Back

27.75% Mg

Front

How many elements are in the substance CaCO₃?

Back

3

Front

If an atom has 3 valence electrons, what charge will it have as an ion?

Back

+3

Front

What is the definition of an ion?

Back

An ion is an atom or molecule that has a net electric charge due to the loss or gain of one or more electrons.

Front

What is the formula for calculating percent composition?

Back

(mass of element in 1 mole of compound / molar mass of compound) x 100%

Front

What is the difference between isotopes and elements?

Back

Isotopes are atoms of the same element with different numbers of neutrons, while elements are defined by their number of protons.

Front

What is the molar mass of CaCO₃?

Back

100.09 g/mol

Front

What is the charge of a sodium ion (Na⁺)?

Back

+1