Chemistry

A combination of different elements joined together is called a __________________.

• compound

• molecule

• element

• atom

One small particle of an element is called an...

Scientists know that everything in the universe that we can observe is made from __________________.

• nutrients

• chemicals

• vitamins

• elements

When 2 or more atoms are joined together (even if they are the same element), they make a(n) _______________.

• compound

• combination

• molecule

• atom

The chemical formula for water is

___ ___ ___.

What do you call a scientist who studies what all things in the universe that we can see are made from?

• an astronomer

• a geologist

• a chemist

• a biologist

What do scientists call symbols used to show compounds?

• chemical formulas

• chemical equations

• chemical reactors

• chemical names

Which chemical compound does NOT contain oxygen?

• C₆H₈O₆

• NaOCl

• CO2

• NH₃

Which element is a gas at room temperature?

• hydrogen

• mercury

• carbon

• lead

Which element is a liquid at room temperature?

• oxygen

• mercury

• nitrogen

• helium