Quiz #8 Chemical Rxns and Safety1. Why is it important to wear

goggles during lab?

2. What is the correct way to write the formula for Chlorine?

3. In the formula Na3PO4 What elements are present?

4. How many of each element is present in the formula of sodium phosphate (in question 3)?

5. Balance the following:__N2 + __H2 __NH3

6. What does H2O (g) symbolize?Predict the following reactions:

__K + __Cl2 ______

__ MgCO3 ________ + _______

__ Ba + __CuSO4 ______ + ____

1. To protect your eyes.2. H2

3. sodium, phosphorous, oxygen

4. 3 Na, 1 P, 4 O

5. N2 + 3 H2 2 NH3

6. gaseous water (steam)7. 2 K+ Cl2 2 KCl

8. MgCO3 MgO + CO2

9. Ba + CuSO4 BaSO4 + Cu

Practice: Single Replacement

• Lithium Fluorine• Potassium Chlorine• Barium Bromine• Strontium Iodine• Calcium• Sodium• Magnesium• Aluminum• Manganese• Zinc• Iron• Cadmium• Cobalt• Nickel• Tin• Lead• Hydrogen• Copper• Silver• Mercury• Gold• Elements CANNOT replace

anything Above them. The reaction does NOT occur in this situation

Less a

ctive

• Mg + H2SO3

• Fe + 3 H2SO3

• Zn + CuSO3

• Cu + ZnSO3

• Ni + PbSO3

• Sn + PbSO3

• Fe + 3 Ag2SO3

H2 + MgSO3

3 H2 + Fe(SO3)3

Cu + ZnSO3

No reaction

Pb + NiSO3

SnSO3+ Pb

Fe2(SO3)3 + 6Ag

Formation of a precipitate

Na

Na

I

Pb2+

N

O

OO

NO

OO

I

+ +

Formation of a gas

Co2+S

Br

H

Br

H

+ +

Formation of Water

K+

Br

H

OH

+ +

Solubility rulesThese rules are useful for determining:

Will a precipitation reaction occur? How can a particular solid compound be created?

Will a compound dissolve in water?

Generally soluble (aq)Compounds containing alkali metals or NH4

+

Compounds containing NO3-

Compounds containing CH3COO- (acetates) Chlorides, bromides, iodides

(these ions combined with Pb2+, Ag+, Hg22+

form insoluble compounds) SO4

2- (these ions combined with Pb2+, Ba2+, Sr2+, Hg22+

form insoluble compounds)

Generally insoluble (s)Compounds containing OH- or S2-

(these ions combined with alkali metals, Ba2+ or the ammonium ion are soluble)

Compounds containing CO32- or PO4

3- (these ions combined with alkali metals are soluble)

Combustion Reactions

• A substance combines with oxygen, releasing a large amount of energy in the form of light and heat.

2 H2 (g) + O2 (g) 2 H2O

O

H

H

O

H

H

Combustion Reactions• A substance combines with oxygen, releasing a

large amount of energy in the form of light and heat.

C3H8 (g) +5 O2 (g) 4 H2O + 3 CO2

CC C

H

H

HH

H

HH

HO

OO

O

O

O

OO

O

O

Combustion Reactions• A substance combines with oxygen, releasing a

large amount of energy in the form of light and heat.

C3H8 (g) +5 O2 (g) 4 H2O + 3 CO2

C

C

C

HH

H

H

HH

H

H O

OO

O

O

O

OO

O

O