Substances: Elements & Compounds, Counting Atoms

In the diagram, each circle represents

• an atom

• a molecule

• a chemical bond

• an electron

Tags

NGSS.MS-PS1-1

In the diagram, each line (stick) represents

• an atom

• a molecule

• a chemical bond

• an electron

Tags

NGSS.MS-PS1-1

Which three are true for a substance?

• Can be expressed by a chemical formula

• Can be a molecule or extended structure

• Can be an element or a compound

• Always has more than one type of atom

Tags

NGSS.MS-PS1-1

Which one of the options below is an element?

• No

• NO

• CO

• HCl

Cl₂ is an example of (select 3 that apply)

• a substance

• an element

• a compound

• a molecule

Tags

NGSS.MS-PS1-1

CH₄ is an example of (select 3 that apply)

• a substance

• an element

• a compound

• a molecule

Tags

NGSS.MS-PS1-1

In the expression 4NH₃, the "4" is called a

• chemical formula

• subscript

• coefficient

• substance

In the expression 4NH₃, the "3" is called a

• chemical formula

• subscript

• coefficient

• substance

Tags

NGSS.MS-PS1-1

In the expression 6 CO₂, the 6 tells you

• How many oxygen atoms are in one molecule

• How many molecules

• How many carbon atoms are in one molecule

• That there are 6 atoms total in the molecule

Tags

NGSS.MS-PS1-1

In the expression 6 CO₂, the 2 tells you

• How many oxygen atoms are in one molecule

• How many molecules

• How many carbon atoms are in one molecule

• That there are 2 atoms total in the molecule

Tags

NGSS.MS-PS1-1