NCHS - Chemistry Fall Final Review

14.  What is the correct formula for copper(I) cyanide?

•       CuCy
•       CuCy₂
•     CuCN
•   Cu₂CN

Tags

NGSS.HS-PS1-2

15.  What is the correct formula for the compound made of magnesium and nitrogen?

•    Mg₂N₃
•       Mg₃N₂
•     MgN₂
•       MgN

Tags

NGSS.HS-PS1-2

Which of the following is not evidence of a new substance?

• temperature change

• liquid disappears when poured into another

• gas production

• solid formation

Tags

NGSS.MS-PS1-2

Which of the following substances are elements?

• water

• salt

• carbon dioxide

• hydrogen

How many elements are in this Carbon dioxide molecule?

• 3

• 2

• 1

• 0

Tags

NGSS.MS-PS1-1

Evaporating, dissolving, & melting are all examples of

• elements

• compounds

• physical changes

• chemical reactions

This symbol indicates a _______.

• neutron

• proton

• electron

Tags

NGSS.HS-PS1-8

How many molecules are in this formula?

• 1

• 2

• 3

• 6

Tags

NGSS.MS-PS1-1

What information does a subscript number tell us?

• the number of atoms per element

• the number of molecules per formula

Tags

NGSS.MS-PS1-1

An electron is located ...

• in the nucleus.

• outside the nucleus.