Unit 2

Question 1

Define the law or conservation of mass

Answer 1

The total mass of the reactants is equal to the total mass of the products

Question 2

When using a skeleton equation, add __ in front of the formulas following the ?

Answer 2

Coefficients, Law of conservation of mass

Question 3

What are the super seven

Answer 3

Seven elements that are diatomic

Question 4

List the super seven

Answer 4

H O F Br I N Cl

Question 5

Define diatomic

Answer 5

Elements that exist as 2 identical atoms bonded covalently to each other

Question 6

Define MINOH

Answer 6

Metals
Ions (polyatomic)
Non metals
Oxygen
Hydrogen

Question 7

Lost 5 ways a chemical reaction has occurred

Answer 7

Colour change
Odour
Change in state
Release of energy
Irreversible

Question 8

Combustion:

C(x)H(y) + ____ ==> ?

Answer 8

O2 ==> CO2 + H2O

Question 9

Decomposition reaction

Answer 9

A single compound breaks down into elements or simpler compounds

Question 10

If heat is required for decomposition, what is it called?

Answer 10

Thermal decomposition

Question 11

Combustion reaction

The oxide burning carbon produces what?

The oxide burning hydrogen produces what?

Answer 11

Reaction of a substance with oxygen to produce oxides + heat + light

CO2 (g)

H2O (g)

Question 12

Single displacement

Answer 12

Element reacts with a compound to form a new element and new compound

Question 13

Define spectator

Answer 13

A passive onlooker that does not participate in the reaction

Question 14

Metals react by losing what

Answer 14

Losing valence electrons

Question 15

The more active metal displaces the less active what

Answer 15

Metal ion

Question 16

Incomplete Combustion:

C(x)H(y) + O2 ==> ?

Answer 16

C + CO + CO2 + H2O

Question 17

If the fuel is a hydrocarbon (_ & _ only) the oxides are what?

Answer 17

F and H

CO2 H2O

Question 18

Why does incomplete combustion occur

Answer 18

Due to fuel impurities and or oxygen mixtures

Question 19

Hydrocarbons only burn completely with enough what?

Answer 19

O2

Question 20

List 2 covleats for complete combustion

Answer 20

Fuel is pure

Oxygen is pure

Question 21

Define catalyst

Answer 21

Speeds up a reaction but isn’t consumed in reaction

Question 22

Bases break apart to form what?

Answer 22

A negatively charged hydroxide

Question 23

An acid dissolves in water because?

Answer 23

It donates hydrogen ions

Question 24

Base = ?

Answer 24

Metal + O2 + H2O

Question 25

Acid = ?

Answer 25

Non metal + O2 + H2O

Question 26

``` A base turns Blue litmus Red litmus PH Bromothymol ```

Answer 26

Blue Blue Pink Yellow

Question 27

``` An acid turns Red litmus Blue litmus PH Bromothymol ```

Answer 27

Red Red Colourless Yellow

Question 28

The more reactive the element the smaller or larger the electronegativity value

Answer 28

Smaller