U2: Atoms, Molecules, and Air

Front

Which of the following statements is true about atoms? Atoms can be created and destroyed, Atoms do not have mass, Atoms take up space, Atoms cannot be bonded together to build molecules.

Back

Atoms take up space

Front

What percentage of air is typically nitrogen?

Back

78%

Front

A molecule is ______.

Back

two or more atoms bonded together

Front

What is the approximate percentage of oxygen molecules in the air?

Back

21%

Front

Atoms of one element do not typically change into atoms of another element. True or False?

Back

True

Front

Which of the following is a property of molecules?
Options:
They cannot be broken apart and made into new types of molecules,
They act differently than the atoms that make them up,
They are the same as atoms - they cannot be changed,
They do not take up space or have mass

Back

They act differently than the atoms that make them up

Front

Air has mass and takes up space because it is made up of ______.

Back

tiny particles

Front

Atoms can be bonded together to build ______.

Back

molecules

Front

Here is a chemical reaction. How many oxygen atoms are involved in the reaction?

Back

4