Reaction Types-Yellow Sheet

Question 1

CaCO₃ (s) —> CaO (s) + CO₂ (g)

Answer 1

Decomposition

Some metallic carbonates when heated will decompose to metallic oxide and carbon dioxide.

Question 2

2KOH (aq) + H₂SO₄ (aq) —> K₂SO₄ (aq) + 2H₂O (l)

Answer 2

Double Displacement

A + B = S + H₂O

Question 3

Fe (s) + S (l) —> FeS (s)

Answer 3

Synthesis

Combo of elements.

Question 4

AgNO₃ (aq) + NaCl (aq) —> AgCl (s) + NaNO₃ (aq)

Answer 4

Double Displacement

S + S = insoluble S + soluble S

Question 5

Ca (s) + 2H₂O (l) —> Ca(OH)₂ (aq) + H₂ (g)

Answer 5

Single Displacement

Active metals (Na, Ca, K) reacts with water will give a metallic hydroxide and hydrogen gas.

Question 6

2Na (s) + 2H₂O (l) —> 2NaOH (aq) + H₂ (g)

Answer 6

Single Displacement

Active metals (Na, Ca, K) reacts with water will give a metallic hydroxide and hydrogen gas.

Question 7

2Fe(OH)₃ (s) —> Fe₂O₃ (s) + 3H₂O (g)

Answer 7

Decomposition

Bases when heated will decompose to water and basic anhydride.

Question 8

2KClO₃ (s) —> 2KCl (s) + 3O₂ (g)

Answer 8

Decomposition

Metallic chlorates when heated will decompose to metallic chlorides and oxygen.

Question 9

P₂O₅ (s) + 3BaO (s) —> Ba₃(PO₄)₂ (s)

Answer 9

Synthesis

Acid anhydride with basic anhydride will form a salt.

Question 10

H₂SO₃ (aq) —> SO₂ (g) + H₂O (l)

Answer 10

Decomposition

Acids when heated will decompose to water and acid anhydride.

Question 11

Na₂O (s) + H₂O (l) —> 2NaOH (aq)

Answer 11

Synthesis

Basic anhydride with water will form a base.

Question 12

Na₂SO₄ (aq) + Ba(NO₃)₂ (aq) —> BaSO₄ (s) + 2NaNO₃ (aq)

Answer 12

Double Displacement

S + S = insoluble S + soluble S

Question 13

2Ag₂O (s) —> 4Ag (s) + O₂ (g)

Answer 13

Decomposition

Some metallic oxides decompose when heated.

Question 14

Ca(OH)₂ (s) —> CaO (s) + H₂O (g)

Answer 14

Decomposition

Bases when heated will decompose to water and basic anhydride.

Question 15

BaO (s) + H₂O (l) —> Ba(OH)₂ (aq)

Answer 15

Synthesis

Basic anhydride with water will form a base.

Question 16

NH₄Cl (aq) + NaOH (aq) —> NaCl (aq) + NH₄OH

Answer 16

Double Displacement

S + B = 2^nd S + 2^nd B

Question 17

2Na (s) + Cl₂ (g) —> 2NaCl (s)

Answer 17

Synthesis

Combo of elements.

Question 18

Ca(OH)₂ (aq) + 2HNO₃ (aq) —> Ca(NO₃)₂ (aq) + 2H₂O (l)

Answer 18

Double Displacement

A + B = S + H₂O

Question 19

MgCl₂ (l) —> Mg (l) + Cl₂ (g)

Answer 19

Decomposition

Compounds that are decomposed into elements by electricity.

Question 20

SO₂ (g) + H₂O (l)—> H₂SO₃ (aq)

Answer 20

Synthesis

Acid anhydride with water will give an acid.

Question 21

2KNO₃ (aq) + H₂SO₄ (aq) —> K₂SO₄ (aq) + 2HNO₃

Answer 21

Double Displacement

S + A = 2^nd S + 2^nd A

Question 22

Ni(ClO₃)₂ (s) —> NiCl₂ + 3O₂ (g)

Answer 22

Decomposition

Metallic chlorates when heated will decompose to metallic chlorides and oxygen.

Question 23

2NaCl (aq) + H₂SO₄ (aq) —> Na₂SO₄ (aq) + 2HCl (g)

Answer 23

Double Displacement

S + A = 2^nd S + 2^nd A

Question 24

CuSO₄ (aq) + Na₂S (aq) —> CuS (s) + Na₂SO₄ (aq)

Answer 24

Double Displacement

S + S = insoluble S + soluble S

Question 25

Br₂ (g) + 2KI (aq) —> 2KBr (aq) + I₂ (g)

Answer 25

Single Displacement

More active halogens will displace less active halogens.

Question 26

Fe (s) + H₂SO₄ (aq) —> FeSO₄ (aq) + H₂ (g)

Answer 26

Single Displacement

Active metal (Zn, Fe, Al) displaces hydrogen in acids to give a salt and hydrogen gas.

Question 27

2HgO (s) —> 2Hg (l) + O₂ (g)

Answer 27

Decomposition

Some metallic oxides decompose when heated.

Question 28

Li₂CO₃ (s) —> Li₂O (s) + CO₂ (g)

Answer 28

Decomposition

Some metallic carbonates when heated will decompose to metallic oxide and carbon dioxide.

Question 29

Pb (s) + 2AgC₂H₃O₂ (aq) —> Pb(C₂H₃O₂)₂ (aq) + 2Ag (s)

Answer 29

Single Displacement

A more active metal will replace a less active metal.

Question 30

CH₄ + 2O₂ —> CO₂ +H₂O

Answer 30

Combustion

Question 31

2NaCl (l) —> 2Na (l) + Cl₂ (g)

Answer 31

Decomposition

Compounds that are decomposed into elements by electricity.

Question 32

H₂CO₃ (aq) —> CO₂ (g) + H₂O (l)

Answer 32

Decomposition

Acids when heated will decompose to water and acid anhydride.

Question 33

2H₂O (l) —> 2H₂ (g) + O₂ (g)

Answer 33

Decomposition

Compounds that are decomposed into elements by electricity.

Question 34

2C₄H₁₀ + 13O₂ —> 8CO₂ + 10H₂O

Answer 34

Combustion

Question 35

Zn (s) + 2HCl (aq) —> ZnCl₂ (aq) + H₂ (g)

Answer 35

Single Displacement

Active metal (Zn, Fe, Al) displaces hydrogen in acids to give a salt and hydrogen gas.

Question 36

CO₂ (g) + H₂O (l) —> H₂CO₃ (aq)

Answer 36

Synthesis

Acid anhydride with water will give an acid.

Question 37

FeS (s) + 2HCl (aq) —> FeCl₂ (aq) + H₂S (g)

Answer 37

Double Displacement

S + A = 2^nd S + 2^nd A

Question 38

CO₂ (g) + Na₂O (s) —> Na₂CO₃ (s)

Answer 38

Synthesis

Acid anhydride with basic anhydride will form a salt.

Question 39

Cl₂ (g) + 2NaBr (aq) —> 2NaCl (aq) + Br₂ (aq)

Answer 39

Single Displacement

More active halogens will displace less active halogens.

Question 40

Ca(C₂H₃O₂)₂ (aq) + (NH₄)₂CO₃ —> CaCO₃ (s) + 2NH₄C₂H₃O₂ (aq)

Answer 40

Double Displacement

S + S = insoluble S + soluble S

Question 41

Fe (s) + Cu(NO₃)₂ (aq) —> Fe(NO₃)₂ (aq) + Cu (s)

Answer 41

Single Displacement

A more active metal will replace a less active metal.