Quiz #1 Chemical Rxns and Safety

Quiz #1 Chemical Rxns and Safety

1. Do you light gas jets or Bunsen Burners? Explain.

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

3. In the formula NH4C2H3O2 What elements are present?

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

5. Balance the following: __Ca + __N2 __Ca3N2

6. What does H2O (l) symbolize?7. Predict the following reaction:

Ca + F2 ______

1. You light Bunsen burners so the flame goes up, not toward you, and so the flames don’t travel into the pipes and explode the room.

2. F2

3. N, C, H, and O

4. 1 N, 2 C, (3 + 4 =) 7 H, 2 O

5. 3 Ca + N2 Ca3N2

6. H2O (l) = liquid water 7. Ca + F2 CaF2

Practice• Active metal oxides react with water to form

hydroxides. ex:• Na2O + H2O ________• Many oxides of nonmetals react with water to

form oxyacids. ex:• SO2 + H2O _________

• Some metal oxides react with nonmetal oxides to form salts.

• Na2 O + SO2 ________• Active metals react with halogens to form salts.• __Na + Cl2-

2NaOH

H2SO3

Na2SO3

2 NaCl2

DecompositionAX A + X

• 2H2O 2H2 + O2

O

H

H

O

H

HElectrolysis: decomposition of a substanceby an electric current.

DecompositionAX A + X

• 2HgO 2Hg + O2

OHg

OHg

This reactionoccurs when youheat orange coloredmercury (II) oxide.

Silver mercury and oxygen gas form.

Decompositionof metal carbonatesACO3 AO + CO2 (g)• CaCO3 (s) CaO (s) + CO2 (g)

OCa

O

This reactionoccurs when youheat calcium carbonate.

calcium oxide and carbondioxide form.

O

C

Decompositionof metal hydroxidesAOH AO + CO2 (g)• Ca(OH)2 (s) CaO (s) + H2O (g)

H

Ca

O

This reactionoccurs when youheat calcium hydroxide

calcium oxide and waterform.

OH

Decomposition of metal chloratesAClO3 ACl + O2 (g)

• 2KClO3 (s) 2KCl (s) + 3O2 (g)

K

O

This reactionoccurs when youheat potassium chlorate.

potassium chloride and oxygen form.

Cl

OK

O

O

ClO

O

Decomposition of acidsH2CO3 (aq) H2O (g) + CO2 (g)

Carbonic aciddecomposes whenwarmed.

water and carbon dioxide form.

O

OO

C

HH

Practice• Na2CO3

• FeO

• CaCO3

• NaCl

• ZnCl2

• MgCO3

• Na2CO3 Na2O + CO2

• 2 FeO 2 Fe + O 2

• CaCO3 CaO + CO2

• 2 NaCl -> 2Na + Cl2

• ZnCl2 Zn + Cl2

• MgCO3 MgO + CO3

More Practice• __NaOH

• __Fe(OH)3

• __CaCO3

• __NaClO3

• __Zn(ClO3)2

• __Mg(OH)2

• 2 NaOH Na2O + H2O

• 3 Fe(OH)3 3 Fe2O + 6H2O

• Ca(ClO3)2 CaCl2 + 3 O2

• 2 NaClO3 -> 2NaCl + 3 O2

• Zn(ClO3)2 ZnCl2 + 3 O2

• Mg(OH)2 MgO + H2O

Single DisplacementA+ BX AX + Bor:Y + BX BY + X• Replacement of a metal in a compound by another

metal.

2 Al (s) + 3Pb(NO3)2 3Pb +2 Al(NO3)3

Al

Al

Pb2+

N

O

OO

N

O

O

O

NO

O

O

NO

O

O

N

O

O

O

NO

O O

Pb2+

Pb2+

Single DisplacementA+ BX AX + Bor:Y + BX BY + X• Replacement of a metal in a

compound by another metal.2 Al (s) + 3Pb(NO3)2 3Pb +2 Al(NO3)3

Al3+Al3+

Pb

N O

O

OPb

N O

O

O

Pb

NO

O O

NO

O

O

NO

OO

NO

O O

Single DisplacementA+ BX AX + Bor:Y + BX BY + X• Replacement of a hydrogen in a

compound by a metal.2 Na (s) + 2 H2O (l) 2 NaOH (aq) + H2 (g)

Na

NaO

H

H

O

H

H

Single DisplacementA+ BX AX + Bor:Y + BX BY + X• Replacement of a hydrogen in a

compound by a metal.Mg (s) + 2 HCl (aq) MgCl2 (aq) + H2 (g)

Mg

Cl

H

Cl

H

Single DisplacementA+ BX AX + Bor:Y + BX BY + X• Replacement of halogens

Cl2 (g) + 2 KBr (aq) 2 KCl (aq) + Br2 (g)

ClK

Br

Br

K

Cl

Double Replacement Reactions (double displacement)• Formation of a precipitate.• 2 KI (aq) + Pb(NO3)2 (aq) PbI2 (s) + 2 KNO3 (aq)

K

K

I

Pb2+

N

O

OO

NO

OO

I

Double Replacement Reactions (double displacement)• Formation of a gas.• FeS (s) + 2 HCl(aq) H2S (g) + FeCl2 (aq)

Fe2+S

Cl

H

Cl

H

Double Replacement Reactions (double displacement)• Formation of a water.• NaOH (s) + HCl(aq) H2O (l) + NaCl2 (aq)

Na+

Cl

H

OH

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