Fall Semester Review

Front

What is the number before a chemical formula called?

Back

Coefficient

Front

What is 7.535 rounded to two significant figures?

Back

7.5

Front

240 cm = ___________ m

Back

2.4

Front

Name the compound: N2O5.

Back

dinitrogen pentaoxide

Front

Physical properties are:

Back

properties that can be observed without changing the identity of the substance.

Front

What is a subscript in a chemical formula?

Back

A subscript indicates the number of atoms of an element in a molecule.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the substance's identity, while a chemical change results in a new substance.

Front

What is the formula for calculating density?

Back

Density = Mass/Volume

Front

What is the significance of significant figures in measurements?

Back

Significant figures indicate the precision of a measurement.

Front

What is the term for a substance made of two or more elements chemically bonded together?

Back

Compound