Unit 2, types of chemical reactions

Question 1

Order of balancing

Answer 1

1. metals
2. nonmetals (including polyatomics)
3. hydrogen and oxygen

Question 2

Reaction conditions

Answer 2

-write above or below equation arrow
-triangle: the reactants are heated
-light: light is released during the reaction
-specific temperature: reactants were heated by a specific temp.

Question 3

Steps to predicting products

Answer 3

1. write ions
2. write chemical formula
3. write states of matter (if known)
4. Balance using coefficients

Question 4

Synthesis/combination

Answer 4

A + B = AB

Question 5

Non-metals will react with oxygen to form

Answer 5

non-metal oxides

Question 6

C(s) + 02(g) –>

Answer 6

CO2(g)

Question 7

Non-metal oxide + water

Answer 7

oxyacid

Question 8

SO2(g) + H2O(l) –>

Answer 8

H2SO3(aq)

Question 9

Metal + oxygen

Answer 9

metal oxide

Question 10

Na(s) + O2(g) –>

Answer 10

Na2O(s)

Question 11

Metal oxides react with water to form

Answer 11

bases (basic oxides) (metal hydroxide)

Question 12

Na2O(s) + H2O(l) –>

Answer 12

NaOH(aq)

Question 13

Metal oxides + non-metal oxides –>

Answer 13

salt containing oxyanion

Question 14

CaO(s) + CO2(g) –>

Answer 14

CaCO3(s)

Question 15

Glowing splint test

Answer 15

used to identify the presence of oxygen gas (O2); a glowing splint will reignite and burst into flame when introduced to a sample of oxygen

Question 16

Burning splint test

Answer 16

The test for hydrogen uses a burning splint held at the open end of a test tube of the gas. Hydrogen burns rapidly with a pop sound.

Question 17

Lime water test

Answer 17

The lime water test is a chemical method used to detect the presence of carbon dioxide (CO₂) gas, where bubbling CO₂ through a solution of calcium hydroxide (lime water) causes it to turn cloudy or milky due to the formation of a white precipitate of calcium carbonate.

Question 18

Decomposition

Answer 18

AB –> A + B

Question 19

Metal carbonates (+heat) –>

Answer 19

metal oxide + CO2(g)

Question 20

CaCO3 –>(triangle on top)

Answer 20

CaO(s) + CO2(g)

Question 21

Some acids decompose when

Answer 21

heated

Question 22

H2CO3(aq) –> (triangle on top)

Answer 22

H2O(l) + CO2(g)

Question 23

Metal hydroxides (+ heat) –>

Answer 23

Metal oxides + h2O(l)
*does not happen for group 1 hydroxides

Question 24

Ca(OH)2 –>(triangle on top)

Answer 24

CaO(s) + H2O(l)
*does not happen for group 1 hydroxides

Question 25

Metal Nitrates (+heat) -->

Answer 25

Metal nitrite + O2(g)

Question 26

NaNO3 --> (triangle on top)

Answer 26

NaNO2 + O2(g)

Question 27

Nonmetal nitrates NH4NO3(s) --> (triangle on top)

Answer 27

H2O(l) + N2O(g)

Question 28

Hydrogen peroxide (+catalyst MNO2) -->

Answer 28

water +. oxygen gas

Question 29

H2O2-->

Answer 29

H2O(l) + O2(g) (bubles)

Question 30

Single displacement reaction

Answer 30

A + BC = AC + B -substitution of B with A depends on A's activity (see in activity series of metals) -If A is MORE reactive than B, A will substitute B -write "no reaction" if A does not replace B

Question 31

For multivalent non specified

Answer 31

use most common charge (bolded one)

Question 32

Activity series for halogens

Answer 32

Most reactive F Cl Br I least reactive

Question 33

Double displacement reactions

Answer 33

AB + CD = CB + AD -reactants are always (aq) -use chart to find states of products

Question 34

Writing word equations

Answer 34

State of matter: SM SM reactant "reacts with" SM reactant "to produce" SM product "and" SM product

Question 35

Signs of a chemical change

Answer 35

-production of a gas -colour change -formation of a precipitate

Question 36

Signs of a Double Displacement reaction

Answer 36

1. formation of a precipitate (s) 2. formation of a gas (g) 3. formation of water (l) *if ALL products remain aqueous NO REACTION has occured