7th Grade- Unit 3 Exam Review

How many protons does Oxygen have?

• 4
• 6
• 8
• 10

Tags

NGSS.MS-PS1-1

How many protons does Carbon have?

• 4

• 6

• 8

• 10

Tags

NGSS.MS-PS1-1

What is the atomic number of Helium?

• 1

• 2

• 3

• 4

A chemical change is different than a physical change because in a chemical change 

• the temperature remains constant
• the state of matter changes
• the mass of the substances remains the same
• new substances are formed with different properties

Tags

NGSS.MS-PS1-2

In a chemical change, what happens to the original substances?

• They are destroyed

• They are transformed into new substances

• They remain the same

• They are reduced in mass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens to the atoms in a reactant during a chemical reaction?

• Unbound, rearrange, and re-bond to form new substances

• Completely disappear
• New atoms are formed

• Stay the same

Tags

NGSS.MS-PS1-5

In a chemical reaction, if the reactants are heated, the reaction usually happens 

• at the same rate
• faster
• slower
• without any change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Is condensation on a water bottle a chemical reaction?

• Only if it's a hot day
• No
• Maybe
• Yes

Tags

NGSS.MS-PS1-4

How many elements are on the periodic table?

• 118
• 64
• 92
• 50

The atomic number is the amount _________ in an atom.

• of electrons
• of molecules
• of neutrons
• of protons