Summative practice G+H

The element oxygen, represented by the symbol O, is classified as

• a pure substance
• a compound
• a mixture
• a solution

Tags

NGSS.MS-PS1-1

The chemical combination of two or more different kinds of atoms in fixed amounts is called a(n)

• orbit
• compound
• mixture
• element

Tags

NGSS.MS-PS1-1

The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?

• compound
• liquid
• element
• mixture

This is the smallest unit of an element.

• atom

• molecule

• compound

• nucleus

Tags

NGSS.MS-PS1-1

This is any combination of two or more atoms from different elements that are chemically combined.

• compound

• molecule

• element

• pure substance

Tags

NGSS.MS-PS1-1

This is a one or two letter representation of each element that is generally close to the element's name. The first letter of this will ALWAYS be capitalized.

• chemical symbol

• chemical number

• atomic number

• atomic mass

Elements are made of 

• many types of atoms 
• the periodic table
• one type of atom 
• molecules 

Tags

NGSS.MS-PS1-1

How many hydrogen atoms are there in a water molecule? 

• 0
• 1
• 2
• 3

Tags

NGSS.MS-PS1-1

What is the total number of atoms in an ammonia (NH₃) molecule?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

Carbon dioxide (CO₂) contains how many atoms of oxygen?

• 0
• 1
• 2
• 3

Tags

NGSS.MS-PS1-1