Types of Chemical Changes

Question 1

Synthesis/Addition/Combination/Composition

Answer 1

A + B –> AB
- 2 smaller and 1 bigger

Question 2

Decomposition

Answer 2

AB –> A + B
-1 big 2 smaller
(H2O2 –> O2 + H2O)

Question 3

Single Displacement

Answer 3

ele1 +cpd1 –> cpd2 + ele2
( C + Cu2O –> CO2 + Cu)

Question 4

Double Displacement

Answer 4

AB + CD –> AD +CB

Question 5

Precipitation (DD)

Answer 5

AB(aq) + CD(aq) –> AD(aq) + CB(s)

Question 6

Acid

Answer 6

H to NM
-HCl
-HNO3
H2SO4

Question 7

Base

Answer 7

M to OH
-NaOH
-Ca(OH)2

Question 8

Solid

Answer 8

M to Nm
-NaCl

Question 9

Water

Answer 9

H to OH / H2O

Question 10

Acid base neutralization (DD)

Answer 10

A + B –> S + W
- HF + KOH –> KF + H2O
-2HBr +Ca(OH)2 –> CaBr +2H2O

Question 11

Oxidation (reduction reactions)

Answer 11

a chemical change involving O2 or a substance with similar properties to O2
- cellular respiration
-Propane Combustion

Question 12

Variable of oxidation

Answer 12

-presence of humidity (increase rate)
-Light E (increase rate)
- Galvanization (decrease rate)
-antioxidants in fruits/veggiesslow down aging maybe (decrease rate)
-

Question 13

Galvanization

Answer 13

coating mom iron with zinc= the zinc oxidizes first protection the iron

Question 14

Combustion (fast oxidation)

Answer 14

releases a lot go HE
- ex: burning wood, cellular respiration(burning sugar), burning FF
- FF: oil, coal, natural gases,
- FF + O2 –> CO2 + H2O

Question 15

Not enough O2 in combustion reaction=

Answer 15

CH4 + O2 –> CO + H2O
carbon monoxide

Question 16

FF contain sulfur so when they burn they produce SO2 which leads to

Answer 16

ACID RAIN=BAD
SO2 + H2O –> H2SO4 (H-Nms = acid)

Question 17

types of combustion

Answer 17

1) rapid combustion
2) slow combustion
3) spontaneous combustion

Question 18

Rapid combustion

Answer 18

• Short period of time
  -Large amounts of HE + LE
• ex: campfire, MgO2 –> MgO + bright withe light

Question 19

Slow combustion

Answer 19

-plus O2 = rusting
- 4Fe + 302 –> 2Fe2O3

Question 20

Spontaneous Combustion

Answer 20

• process overtime
• oily rags, put in a closet and they react with O2 SUPPER slowly –> HE
• overtime the HE increases and the T until reach the ignition temp