Chemistry

Question 1

What is a chemical reaction?

Answer 1

A process in which substances interact, causing different substances with different properties to form.

Question 2

What are some factors that affect the rate of chemical reaction?

Answer 2

• Temperature - up temp, up rate of reaction
• Concentration - up concentration, up rate of reaction
• Surface area - up surface area, up rate of reaction
• Addition of a catalyst - add a catalyst, up rate of reaction
• Type of particle - the simpler the type of reactant, the faster the rate of reaction

Question 3

Identify the coefficients in the following chemical reaction:
2H2 + O2 → 2H2O

Answer 3

2H2 + O2 → 2H2O

Question 4

What is a coefficient?

Answer 4

In a balanced chemical equation, a positive number that is placed in front of a formula to show the relative number of particles of the substance that are involved in the reaction

Question 5

What is the formula for a synthesis reaction?

Answer 5

A + B = AB

Question 6

Complete the synthesis reaction:
Metal + non-metal → ?

Answer 6

Metal + non-metal → ionic compound

Example: Mg + Br2 → MgBr2

Question 7

Complete the synthesis reaction:
? + ?→ ionic compound

Answer 7

Metal + non-metal → ionic compound

Example: Mg + Br2 → MgBr2

Question 8

Complete the synthesis reaction:
metal chlorides + oxygen → ?

Answer 8

metal chlorides + oxygen → metal chlorate

Example: LiCl + O2 → LiCLO2

Question 9

Complete the synthesis reaction:
? + ? → metal chlorate

Answer 9

metal chlorides + oxygen → metal chlorate

Example: LiCl + O2 → LiCLO2

Question 10

Complete the synthesis reaction:
metal carbonate + water + carbon dioxide → ?

Answer 10

metal carbonate + water + carbon dioxide → metal bicarbonate

Example: LiCO3 + H2O + CO2 → LiHCO3

Question 11

Complete the synthesis reaction: ?+?+? → metal bicarbonate

Answer 11

metal carbonate + water + carbon dioxide → metal bicarbonate

Bicarbonate is also written as HCO3^-

Example: LiCO3 + H2O + CO2 → LiHCO3

Question 12

Complete the synthesis reaction: metal oxide + carbon dioxide → ?

Answer 12

metal oxide + carbon dioxide → metal carbonate

Li2 + CO2 → Li2CO3

Question 13

Complete the synthesis reaction: ? + ? → metal carbonate

Answer 13

metal oxide + carbon dioxide → metal carbonate

Example: Li2 + CO2 → Li2CO3

Question 14

Complete the synthesis reaction: metal oxide + water →

Answer 14

metal oxide + water → metal hydroxide

Example: BeO + H2O → Be(OH)2

Question 15

Complete the synthesis reaction: ? + ? → metal hydroxide

Answer 15

metal oxide + water → metal hydroxide

Example: BeO + H2O → Be(OH)2

Question 16

Complete the synthesis reaction: non-metal oxide + water → ?

Answer 16

non-metal oxide + water → acid

Example: SO3 + H2O → H2SO4

Question 17

Complete the synthesis reaction: ? + ? → acid

Answer 17

non-metal oxide + water → acid

Example: SO3 + H2O → H2SO4

Question 18

What are the 3 types of synthesis reactions?

Answer 18

1 two elements forming a binary compound
H2 + O2 → H2O
2 an element and a compound forming a new compound
3 two compounds forming a new compound

Question 19

What is a decomposition reaction?

Answer 19

A chemical reaction in which a compound breaks down into elements or simpler compounds

Question 20

What is the formula for a decompositiom reaction?

Answer 20

AB = A + B

Question 21

What is the one type of decomposition reaction that is not a reverse of a synthesis reaction?

Answer 21

Metal bicarbonate → carbon dioxide + water + metal carbonate

Example: Mg(HCO3) → CO2 + H2O + MgCO3

Question 22

What is electrolysis?

Answer 22

A process that uses electrical energy to cause a chemical reaction

Question 23

What is a combustion reaction?

Answer 23

The reaction of a compound or element with oxygen.

Question 24

What does a blue flame indicate in a combustion reaction?

Answer 24

A blue flame indicates that complete combustion is occurring

Question 25

What does a yellow flame indicate in a combustion reaction?

Answer 25

A yellow flame indicates that an incomplete combustion reaction is taking place.

Question 26

Complete the following **combustion reaction**: Metal + oxygen gas → ?

Answer 26

Metal + oxygen gas → **metal oxide** ## Footnote Fe + O2 → Fe2O2

Question 27

Complete the following **combustion** reaction: ? + ? → metal oxide

Answer 27

**Metal + oxygen gas** → metal oxide

Question 28

In what case is a combustion reaction considered a "**complete combustion reaction**"?

Answer 28

If it occurs in the presense of sufficient oxygen

Question 29

What is the formula for a complete combustion reaction?

Answer 29

Hydrocarbon (g or 𝓁) + oxygen gas → carbon dioxide gas + water vapour ## Footnote Example: C2H6 + O2 → CO2 + H2O

Question 30

In what case is a combustion reaction considered an "**incomplete combustion reaction**"?

Answer 30

If it occurs in the absense of sufficient oxygen

Question 31

What is the formula for a incomplete combustion reaction?

Answer 31

Hydrocarbon + oxygen(g) → carbon dioxide(g) + water(g) + carbon(s) + carbon monoxide(g) ## Footnote C4H10 + O2 → CO2 + H2O + C + CO

Question 32

Is the following formula for a complete or incomplete combustion reaction? Hydrocarbon (g or 𝓁) + oxygen gas → carbon dioxide gas + water vapour

Answer 32

Complete

Question 33

Is the following formula for a complete or incomplete combustion reaction?

Answer 33

Hydrocarbon + oxygen(g) → carbon dioxide(g) + water(g) + carbon(s) + carbon monoxide(g)

Question 34

What is a hydrocarbon?

Answer 34

A compound that is composed only of the elements carbon and hydrogen (CxHy)

Question 35

What is soot?

Answer 35

Fine particles consisting mostly of carbon, formed during the incomplete combustion of a hydrocarbon

Question 36

What are single displacement reactions?

Answer 36

a chemical reaction in which one element in a compound is replaced (displaced) by another element

Question 37

What are the two formulas for single displacement reactions?

Answer 37

metal displaces another metal A + BX → AX + B Non-metal displaces another non-metal AX + Y → AY + X

Question 38

What is the formula for when a metal displaces a metal in a single displacement reaction?

Answer 38

A + BX → AX + B

Question 39

What is the formula for when a nonmetal displaces a nonmetal in a single displacement reaction?

Answer 39

AX + Y → AY + X