Grade 9: Atoms, molecules and compounds

Carbon dioxide is abbreviated as CO₂ because it is made up of 1 carbon atom and 2 oxygen atoms. Carbon dioxide is a/an...

• Colloid because it has carbon in it
• Compound because it is a molecule with more than one type of atom
• Atom because it is the smallest unit of carbon dioxide that exists
• Element because carbon and oxygen are both in the periodic table of elements

Tags

NGSS.MS-PS1-1

Iron is a metal that is mined from the earth. Iron metal is used to make many different things, including buildings and soup cans. Iron is made of only 1 type of atom. Iron is a/an...

• Atomic number
• Compound
• Element
• Atomic weight

Tags

NGSS.MS-PS1-1

Atoms are made up of : 

• water
• protons neutrons and electons
• electrons and protons
• energy

Matter has :

• air and water
• mass and takes up space
• mass and energy that leak out
• compounds only

Protons have a ________ change.

• negative
• neutral
• positive
• magnetic

What is an element?

• Two or more atoms joined together.

• One of over 100 types of atoms

• Two or more different elements joined together.

• A particle with no charge found in the nucleus of an atom.

Tags

NGSS.MS-PS1-1

What is a molecule?

• two non-metal elements bonded together (sharing electrons)

• a mixture of different substances

• smallest individual particles

• salt mixed in water

What is a compound?

• Two different elements bonded together.

• Two of the same elements bonded together.

• A mixture of different substances.

• Two substances stuck together with glue.

Tags

NGSS.MS-PS1-1

How many neutrons are in Nitrogen-14?

• 5
• 6
• 7
• 14

What is the charge of an atom with 10 electrons, 10 neutrons, and 10 protons?

• +10
• +5
• 0
• +1