CHEMICAL REACTIONS & BALANCING OF CHEMICAL EQUATIONS

Question 1

A ________ can be an element or a compound.

Answer 1

SUBSTANCE

Question 2

Process wherein reactants are converted into 1 or more products

Answer 2

CHEMICAL REACTION

Question 2

• It is used to represent the chemical reaction
• It shows the change from reactants to products

Answer 2

CHEMICAL EQUATION

Question 3

“2” in 2H2

Answer 3

Coefficient

Question 4

These can be (g) for gas, (l) for liquid, (s) for solid, (aq) for aqueous

Answer 4

Subscript Letters

Question 5

These indicate how many atoms are present for that element.

Answer 5

Subscript Numbers

Question 6

Two or more reactants combine to form one new product

Answer 6

SYNTHESIS OR COMBINATION REACTION

Question 7

• General Pattern: A + B → AB
• Example: Fe + S → FeS

Answer 7

SYNTHESIS OR COMBINATION REACTION

Question 8

• Opposite of combination reaction
• 1 compound breaks down into two or more simpler substances

Answer 8

DECOMPOSITION REACTION

Question 9

• General Pattern: AB → A + B
• Example: CaCO3 → CaO + CO2

Answer 9

DECOMPOSITION REACTION

Question 10

• A more reactive element will displace (kick out) another less reactive element from a compound
• This depends on the reactivity series

Answer 10

SINGLE DISPLACEMENT REACTION

Question 11

• General Pattern: A + BC → AC + B
• Example: Zn (s) + CuSO4(aq) → ZnSO4 (aq) + Cu(s)

Answer 11

SINGLE DISPLACEMENT REACTION

Question 12

__________ is a chart listing metals in order of decreasing reactivity. In general, the more reactive a metal is, the more vigorously it reacts with other substances.

Answer 12

Reactivity series

Question 13

• Involves “Exchange of Partners”
• Exchange of anions
• Two substances are displaced

Answer 13

DOUBLE DISPLACEMENT REACTION OR METATHESIS

Question 14

• General Pattern: AB + CD → AD + CB
• Example: BaCl2 + NaSO4 → BaSO4 + 2NaCl

Answer 14

DOUBLE DISPLACEMENT REACTION OR METATHESIS

Question 15

When an acid and base are mixed together

Answer 15

Neutralization

Question 16

When an acid and base are mixed together, they usually yield Salt (NaCl) and Water (H2O)

Answer 16

ACID BASE NEUTRALIZATION REACTION

Question 17

Yields H+ when mixed with water

Answer 17

acid

Question 18

Yields OH- when mixed with water

Answer 18

base

Question 19

Occurs when aqueous solutions of anions and cation combine to form an insoluble compound called aprecipitate.

Answer 19

PRECIPITATION REACTIONS

Question 20

Fluid above the precipitate

Answer 20

Supernate/Supernatant

Question 21

Insoluble solid at the bottom of the tube

Answer 21

Precipitate

Question 22

A compound and an oxidant react with each other to produce heat and a new product.

Answer 22

COMBUSTION REACTION

Question 23

General Pattern: CH + O → CO2 + H2O

Answer 23

COMBUSTION REACTION

Question 24

• Oxidation and Reduction (Redox)
• Occurs when the oxidation number of atoms involved in the reaction are changed.

Answer 24

REDOX REACTION

Question 25

• Represents the number of electrons lost or gained by an atom.

Answer 25

OXIDATION NUMBER

Question 26

• An atom’s oxidation number is increased.
• Involves loss of electron
• Charge of an element becomes more positive.

Answer 26

OXIDATION

Question 27

• An atom’s oxidation number is decreased.
• Involves gain of electron
• Charge of an element becomes more negative.

Answer 27

REDUCTION

Question 28

• An atom that undergoes oxidation.
• Whatever that is being oxidized.

Answer 28

REDUCING AGENT

Question 29

• An atom that undergoes reduction.
• Whatever that is being reduced.
  Process of Oxidation and Reduction

Answer 29

OXIDIZING AGENT

Question 30

Chemical equations are balanced to satisfy the ____________________________.

Answer 30

Law of Conservation of Mass

Question 31

This law states that matter cannot be __________________.

Answer 31

created nor destroyed but changed only in form