Chemical Reactions

In an equilibrium reaction, both ______ and ______ reaction rates must be EQUAL.

• synthesis; reverse

• forward; synthesis

• forward; reverse

In oxidation-reduction reactions, 1 substance ______ electrons & another substance ______ electrons.

• creates; destroys

• gains; loses

• creates; loses

Identify this type of reaction: 2 NH₃ → N₂ + 3 H₂

• synthesis

• decomposition

• single-displacement

Answer explanation

Note that there is only 1 reactant in this reaction.

Identify this type of reaction: 2 Li + 2 H₂O → 2 LiOH + H₂

• synthesis

• single-displacement

• double-displacement

Answer explanation

Note that there's 1 element + compound in this reaction.

Why do we (scientifically) store food in a refrigerator?

• because food tastes better when cold

• to slow down reaction rates

• to speed up reaction rates

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Zn + 2 HCl → ZnCl₂ + H_{2.. If starting with 4 mol Zn, you produce this many mol of ZnCl2}

• 4

• 8

• 16

Tags

NGSS.MS-PS1-5

Zn + 2 HCl → ZnCl₂ + H_2.. If starting with 4 mol Zn, you need this many mol of HCl.

• 2

• 4

• 8

Tags

NGSS.HS-PS1-7

The covalent compound of 1 sulfur and 2 oxygen atoms would be termed...

• sulfur oxygen

• sulfur dioxide

• sulfur oxide

Tags

NGSS.MS-PS1-1

Which is NOT a clue that a chemical reaction has occurred?

• material dissolves

• gas is released

• heat is released

• color change occurs

Tags

NGSS.MS-PS1-2

Foods cook faster at higher temperatures because...

• particles collide more often

• particles increase in number

• particles come into contact with water

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5