Chemical Reactions Review

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number to the left of a formula.

Balance this equation.
_Mg + _Cl₂ --> _MgCl₂

• 1, 2,1
• already balanced
• 2,1,1
• 1,1,2

Tags

NGSS.HS-PS1-7

The blue numbers in the image below represent ________

• Charges
• coefficients
• subscripts
• none of the answers are correct

What is the balanced equation for solid sodium reacting violently with water to produce hydrogen gas and aqueous sodium hydroxide.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What is a precipitate?

• water

• solid

• a solid formed from at least 1 aq solution

• a solid that reacts to form an aq solution

Which of the following has the correct mass for the particle?

• alpha = 2

• electron = 1

• neutron = 1

• gamma = 4

What is a fusion reaction?

• When 1 nucleus splits into 2 or more parts

• When two nuclei combine to make 1 larger nuclei

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8

What is a fission reaction?

• When 1 nucleus splits into 2 or more parts

• When two nuclei combine to make 1 larger nuclei

Tags

NGSS.HS-PS1-8

Matter cannot be created or destroyed.

• True

• False

Tags

NGSS.HS-PS1-7

• sodium

• iron

• silver

• nickel