Unit 2

Question 1

Define aqueous

Answer 1

Dissolved in water

Question 2

What are 4 solubility rules

Answer 2

Alkali metals are soluble
Hydrogen is soluble
Ammonium is soluble
Nitrate is soluble

Question 3

What must occur in the product for a reaction to take place

Answer 3

A solid, liquid or gas must be produced

Question 4

Out of 
Na2CO3
CaS
Fe(NO3)3
PbCl2
Which are soluble

Answer 4

Na2CO3
CaS
Fe(NO3)3

Question 5

When making ionic equations when do you not split a compound

Answer 5

When it is a solid liquid or gas

Question 6

What kind of equation produces a double displacement that has water on the product side

Answer 6

Acid + hydroxide = a double displacement with water

Question 7

What is the overall reaction for a dd that produces a gas

Answer 7

Acid + carbonate -> carbon dioxide + water + salt

Question 8

In dd what is the overall reaction for producing a ammonia gas

Answer 8

Ammonium compound + hydroxide compound -> ammonia + water + salt

Question 9

What should you consult before writing a sd reaction?

Answer 9

Activity series

Question 10

SD: what is the product of a metal and acid reaction

Answer 10

Metal goes with the other element (not H) in the back for example H gets divided from HCl + Zn and Cl is added behind Zn

Question 11

SD: what happens when a metal and water and metal react

Answer 11

Reactants must be metal and water which produces the metal and hydroxide compound and H
K + H2O -> KOH + H2

Question 12

SD: halogen + metal halide produces what and what do you have to remeber

Answer 12

Refer to halogen activity series
Switch the compound front to the lone element remeber diatomics
Cl2 + KI -> KCl + I

Question 13

Why are water pipes made of copper or plastic preferred to steel pipes? (2)

Answer 13

• water and plastic do not corrode
• steel pipes have Zn lining which corrodes and causes the steel and water to come in direct contact causing leaks and more corrosion

Question 14

What are some medical uses of titanium and why do they use titanium? (4)

Answer 14

• light weight and anti corrosive
• used for knee and hip replacements
• used for pins and rods for broken bones
• used in dentistry for tooth replacement

Question 15

What is a practical application for alkali metals?
Why are they dangerous?
How can they be used/stored more safely? (4)

Answer 15

• very reactive using hydrogen to make fuel
• react well with water and oxygen making them hazardous to handle
• often kept in liquid ammonium of silica powder to make for easier handling
• alkalis are used in many chemical reactions

Question 16

Which elements are diatomic

Answer 16

H
O
F
Br
I
N
Cl

Question 17

Should you store cobalt (III) nitrate in aluminum jar

Answer 17

No.

Cobalt (III) Nitrate eats through aluminium causing corrosion and brown crust

Question 18

SYN: metal oxide + water produces?

Looks dd w/ water reactant

Answer 18

Metal hydroxide

MgO + H2O -> Mg(OH)2

Question 19

SYN: non metal oxide + water produces?

Answer 19

A H acid

SO3 + H2O -> H2SO4

Question 20

Natural rain is not neutral what causes acid rain?

Answer 20

CO2 dissolves in water in the atmosphere and reacts with the water to produce acid rain
CO2(g) + H2O3(aq)

Question 21

If a base spills what should you do and vice versa

Answer 21

Put a acid on it

Put a base on it

Question 22

What grows best in basic to neutral soil

Answer 22

Celery and carrots

Question 23

What grows better in acidic soil

Answer 23

Strawberries and tomatoes

Question 24

What can you do to change soil levels

Answer 24

Want less base add more acid

want more acid add more base

Question 25

What else is a great use for acid and bases

Answer 25

Stomach acid tablets have bases in them

Question 26

What are reactants used to clean up cyanide spills and what are the benefits and limitations

Answer 26

``` Sodium hypochlorite (found in bleach) This more beneficial than iron (II) sulfate because it only requires 2 reactions to take place also it make a less toxic reaction first and then a completely non toxic with the product being baking soda, table salt, nitrogen gas ```

Question 27

Why is it helpful to make a precipitate

Answer 27

Because you can see the precipitate and filter or scoop it out

Question 28

What are neutralization reactions good for

Answer 28

Treating acid and base spills

Question 29

What are human causes of acid rain

Answer 29

Coal and oil burning power plants

Question 30

What are natural causes of acid rain

Answer 30

Lightning strikes and volcanic explosions

Question 31

What are the problems caused by acid rain

Answer 31

- causes bodies of water to become to acidic to support life | - damages buildings, plants and structures

Question 32

When doing decomp what happens when you have a carbonate

Answer 32

Take element and add and o and add CO2 | Na2CO3->NaO2 + CO2

Question 33

What is hydrazine

Answer 33

Fuel used for the thruster Rockets because of its quick decomposition of hot large volumes of gas from the small fuel this makes the rocket take off

Question 34

How do airbags work (5)

Answer 34

- Abrupt slowing of an vehicle triggers the sensor - the electrical impulse releases sodium azide pellet to be released - it quickly decomposes into nitrogen gas and sodium - the nitrogen gas quickly inflates the bag - sodium azide is toxic but by undergoing decomposition it turns into two harmless chemicals

Question 35

Complete combustion produces

Answer 35

CO2 and H2o

Question 36

An incomplete combustion produces

Answer 36

H20 C02 CO C

Question 37

What are the dangers of carbon monoxide

Answer 37

- it has no colour or Oder making it hard to detect - it binds to oxygen in the blood choking out the oxygen - symptoms come on fast including headache, dizziness, nausea - as you breathe more and more in it becomes more and toxic