Classifying Matter (Section 2.1)

What is a pure substance?

• Matter that always has exactly the same composition

• Matter that can be broken down into simpler substances

• Matter that contains more than one type of atom

• Matter that changes composition frequently

Tags

NGSS.MS-PS1-4

Which of the following are examples of pure substances?

• A) Table salt and table sugar

• B) Air and water

• C) Aluminum and carbon

• D) Oxygen and nitrogen

Substances can be classified into two categories: ______ and ______. (Fill in the blanks)

• elements, compounds

• atoms, molecules

• solids, liquids

• mixtures, solutions

An element is a substance that cannot be ______.

• broken down into simpler substances

• combined with other substances

• measured in grams

• found in mixtures

Each element contains only ______ type of atom.

• one

• two

• three

• many

Tags

NGSS.MS-PS1-1

Which of the following is NOT true about elements?

• A) Each element contains only one type of atom

• B) Elements can be broken down into simpler substances

• C) No two elements contain the same type of atom

• D) Elements have symbols that use one or two letters

At room temperature, which of the following are liquids?

• Bromine and mercury

• Oxygen and nitrogen

• Aluminum and carbon

• Gold and silver

Symbols for elements use ______ or ______ letters.

• one, two

• three, four

• two, three

• four, five

A compound is made from ______ and can be ______.

• two or more simpler substances, broken down

• one element, created

• three or more atoms, dissolved

• a single atom, combined

Tags

NGSS.MS-PS1-1

Water (H2O) is made of ______ and ______. (Fill in the blanks)

• hydrogen, oxygen

• carbon, oxygen

• hydrogen, nitrogen

• carbon, nitrogen

Tags

NGSS.MS-PS1-1