Unit5 Reactivity

Question 1

What is the formula and charge of the ammonium ion?

Answer 1

NH₄ +

Question 2

Nitrate formula and charge

Answer 2

NO₃ -

Question 3

Sulfate formula and charge

Answer 3

SO₄ ² -

Question 4

Hydroxide formula and charge

Answer 4

OH -

Question 5

Carbonate formula and charge

Answer 5

CO₃ ² -

Question 6

What are the 4 ways of making salt?

Answer 6

1. metal + acid
2. metal oxide + acid
3. metal hydroxide + acid
4. metal carbonate + acid

Question 7

What is the product of Metal + Acid?

Answer 7

Salt + Hydrogen

Question 8

What is the product of Metal Oxide + Acid

Answer 8

Salt + Water

Question 9

What is the product of Metal hydroxide + Acid?

Answer 9

Salt + Water

Question 10

Product of Metal carbonate + acid

Answer 10

Salt + Water + Carbon dioxide

Question 11

What is the property of acid?

Answer 11

They all contain Hydrogen

Question 12

The formula and salts formed by Hydrochloric acid

Answer 12

HCl - Chlorides

Question 13

The formula and salts formed by Sulfuric acid

Answer 13

H₂SO₄ - Sulfates

Question 14

The formula and salts formed by Nitirc acid

Answer 14

HNO₃ - Nitrates

Question 15

What is a salt?

Answer 15

compound formed when metal reacts with acid.
e.g Sodium Chloride (NaCl) or Magnesium Chloride (MgCl₂)
1st name metal, 2nd name non-metal.

Question 16

Write a word and symbol equation between Zink + Hydrochloric acid

Answer 16

Zink + Hydrochloric acid → Zink Chloride + Hydrogen.
Zn + 2HCl → ZnCl₂ + H₂

Question 17

What are some everyday products with acid?

Answer 17

Vinegar, Citric acid (Orange/Lemon) and our stomach acid.

Question 18

What is a displacement reaction?

Answer 18

It is a reaction that happens when a more reactive metal displaces the less reactive from the compound.

Question 19

What happens when Magnesium reacts with Copper sulfate?

Answer 19

Magnesium + copper sulfate → Magnesium sulfate + copper
Mg + CuSO₄ → MgSO₄ + Cu

Question 20

Define the thermite reaction and write the word and symbol equation for it.

Answer 20

A reaction between Aluminium and Iron oxide that provides mass amount of heat that makes the iron molten and displaced with Aluminium.
Aluminium + Iron oxide → Aluminium oxide + iron
Al + Fe₂O₃ → Al₂O + 2Fe

Question 21

What is a haematite?

Answer 21

Iron oxide Fe₂O₃
or iron ore
It is not very useful so we do displacement reactions.

Question 22

What is a blast furnace reaction (symol equation)

Answer 22

It is a reaction done to make pure iron by replacing oxygen from the haematite.
C + O₂ –> CO₂
CO₂ + C –> 2CO
Fe₂O₃ + 2CO –> 2Fe + 3CO₂

Question 23

Where is thermite reaction used for?

Answer 23

Welding railway tracks (was useful as it gives out high energy to produce molten iron)

Question 24

Why is sodium + HCl not a good experiment to do?

Answer 24

Sodium is too reactive to work with HCL

Question 25

What is neutralisation?
What is the word equation for it?

Answer 25

The reaction between base and acid to produce salt and water.
Acid + base –> salt + water

Question 26

What is the difference between base and alkali?

Answer 26

a base is the opposite of acid
an alkali is a soluble base (can dissolve in water)

Question 27

What is the PH of acid, neutral, and alkali?

Answer 27

acid - 0 to 6
neutral - 7
alkaline - 8 to 14

Question 28

What is the law of the conservation of mass?

Answer 28

Matter cannot be created or destroyed.

Question 29

How do you know if there was a reaction?

Answer 29

Gas produced, bubbles, color change, cloudiness

Question 30

What is the difference between exothermic and endothermic reactions?

Answer 30

The exothermic reaction gives out energy and the temp (of the surroundings)
increases while the endothermic reaction takes in energy and the temp decreases.

Question 31

What is a diatomic atom?

Answer 31

Compound/molecule that is made up of only two atoms
Ex) H₂, O₂, N₂