5.2

Question 1

Law of Conservation of Mass

Answer 1

During chemical, atoms cannot destroyed or created

Question 2

Decomposition Reactions

Answer 2

When a reactant breaks apart to form several products.

XY——>X+Y

Question 3

Thermal Decomposition Reaction

Answer 3

Only occurs when heated to high temperatures.

Question 4

Combination Reaction

Answer 4

Two reactants combine to form a single product.

X+Y——>XY

Question 5

Precipitation Reaction

Answer 5

When two soluble products combine to form a single insoluble product known as precipitate.

• floating specks
• milky
• cloudy
• solid mass at bottom

Question 6

Ionic Compounds

Answer 6

Crystalline substances make up of crystal lattices of positive cations and negative anions-have neutral charge

Question 7

Oxidation Reaction

Answer 7

When a substance combines with oxygen during chemical reaction.
Two types:
-combustion:substances burn in oxygen producing heat and light
-corrosion: metals react with oxygen to form metal oxides. (Rust)

Question 8

Reduction Reaction

Answer 8

Loses oxygen atoms.

Question 9

Redox Reactions

Answer 9

When electrons are transferred from one substance to another.
O-xidation
I-s
L-oss
R-eduction
I-s
G-ain
Oxidation is gain of oxygen and loss of electrons
Reduction is loss of oxygen gain of electrons