Review 1

The chemical symbol for nitrogen is —

• Ni

• S

• N

• Nt

Which of the following statements are characteristics of an element?

• Elements are made from a mixture.

• An element is a pure substance.

• Elements are represented by a symbol.

• Elements make up matter on Earth.

Which of the following is a compound?

• F

• CO

• He

• Ca

Which of the following substances is an element?

• CO2

• C

• H2O

• NaCl

Compounds are pure substances. What other substances are considered pure substances?

• Elements

• Mixtures

• Chemical reactions

• Quatitative data

Which of the following substances represents an element?

• CO

• Ag

• NaCl

• H2O

A element is represented by a -

• Chemical symbol (eg. Na)

• Number

• A formula

• Multiplication

How many elements are in the chemical formula for water (H2O)?

• 4

• 6

• 2

• 1