Chemical Reactions Review

2H₂ + O₂ ----> 2H₂O What is the product?

• ------>
• 2H₂O
• 2H₂+ O₂

The law of conservation of matter states that

• chemical reactions change matter.
• in chemical reactions, the identity of reactants and products is conserved.
• atoms are neither created nor destroyed in chemical reactions.
• a chemical equation must be balanced.

Tags

NGSS.HS-PS1-7

Balance this equation:
 2Li + Cl₂ -> LiCl

• 2Li + Cl₂ -> 4LiCl2
• 2Li + Cl₂ -> LiCl₂
• 2Li + Cl₂ -> 2LiCl

Tags

NGSS.HS-PS1-7

If a chemical substance has been dissolved in water, what symbol would be used to represent the solution?

• (s)

• (g)

• (l)

• (aq)

Choose the correct coefficients that balance the following equation.

Ca + N₂ --->Ca₃N₂

• 1,3,3

• 2,3,1

• 3,1,1

• 4,1,3

Tags

NGSS.HS-PS1-7

What are the original substances in a chemical reaction called?

• solutions

• reactants

• products

• polyatomic ions

Tags

NGSS.MS-PS1-5

What are the NEW substances produced in a chemical reaction called?

• reactants

• products

• polyatomic ions

• solutions

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of reaction

is occurring?

Al + 3 Ag(NO₃)--> 3 Ag + Al(NO₃)₃

• synthesis

• decomposition

• single replacement

• double replacement

Select the coefficients to balance the following equation.

___Al + ___Ag(NO₃) --> __Ag + __Al(NO₃)₃

• 3,1,1,3

• 1,3,3,1

• 1,2,2,1

• 2,1,1,2

Tags

NGSS.HS-PS1-7

What type(s) of reaction is occurring?

4 Fe + 3 O₂ --> 2 Fe₂O₃

• synthesis

• decomposition

• single replacement

• double replacement