Reactivity Series Reactions (water/acid/metal oxide/ aqeous metal salts)

Question 1

What is the general word equation of the reaction between a metal and water

Answer 1

Metal + water ——) metal hydroxide + hydrogen

Question 2

Which elements of the reacitivity series react with water

Answer 2

The elements above hydrogen

Question 3

When a metal reacts with steam, what is produced

Answer 3

Metal oxide and hydrogen

Question 4

Do metals that are directly above hydrogen like (zinc or iron) react with water? And if not, how could the reaction be made faster

Answer 4

Do not react

Unless water is heated into steam

Question 5

What is the general word equation for the reaction between a metal and an acid

Answer 5

Metal + acid ——-) metal salt + hyrdogen

Question 6

What is the word equation for the reaction between magnesium and hydrochloric acid

Answer 6

Magnesium + hydrochloric acid ———) Magnesium chloride + hydrogen

Question 7

What is the word equation for the reaction between zinc and sulfuric acid

Answer 7

Zinc + sulfuric acid ——-) zinc sulphate + hydrogen

Question 8

Write the balanced symbol equation for the reaction between iron and sulfuric acid

Answer 8

Fe + H2SO4 ———) FeSO4 + H2

Question 9

How slow or fast is the reaction of calcium, magnesium and aluminium is with water

Answer 9

Very slow

Question 10

Give an example of two metals that dont react with cold water but will react with steam

Answer 10

Zinc and iron

Question 11

Describe an experiment how you could test how magnesium reacts with water

Answer 11

Place magnesium in a test tube with soaked cotton wool with water
Heat it, and mineral wool turns to steam

Question 12

Name a metal that reacts mildly with cold water but vigorously with steam

Answer 12

Magnesium

Question 13

Why is the reaction of aluminum and water very slow

Answer 13

Because aluminum is covered in a layer of aluminum hydroxide

Question 14

When putting metals in acid, what kind of reaction is this

Answer 14

Exothermic reaction

Question 15

What three metals can you use in the experiment to test the reaction between metals and acid

Answer 15

Magnesium, Zinc, iron

Question 16

Give three observations when magnesium reacts with hydrochloric acid

Answer 16

• Vigorous fizzing
• colourless solution
• very hot test tubw

Question 17

Give three observations when zinc reacts with hydrochloric acid

Answer 17

• Fizzing
• colourless solution
• warm test tube

Question 18

Which metal out of the three metals used in the experiment to test the reactivty of metals in hydrochloric acid gives a solution that is not colourless

Answer 18

Iron

Question 19

Give three observations when iron reacts with hydrochloric acid

Answer 19

• slow fizzing
• pale green solution
• slightly warm test tube

Question 20

How does surface area of a metal in the hydrochloric acid metal reaction affect the speed

Answer 20

The smaller the surface area the faster the rate of reaction

Question 21

How does the speed of the reaction affect the temperature change

Answer 21

slower the reaction,
More heat will be given to surroundings because it is longer period of time
So water will be less heated
So less temperatyee change

Question 22

How can you test for any gases given off

Answer 22

Use a lighted splint

Question 23

What is the general word equation for the reaction between a metal and an acid

Answer 23

Metal+ acid——-) metal salt + hydrogen

Question 24

When magnesium reacts with copper sulphate solution, what is the solution and why

Answer 24

Magnesium sulphate + copper

Because the magnesium is more reactive so it displaces the copper

Question 25

State the product of magnesium + copper sulphate | And descibre the colour change

Answer 25

Magnesium sulphate + copper Blue solution to colourless (Copper sulphate colour and then magnesium sulphate) (Reaction between more reactive metal and less reactive rather than between metal and acid)

Question 26

In the displacement reaction between magnesium + copper sulphate, what happens to the copper at the end of the reaction

Answer 26

It is displaced by the magnesium and so coats the magnesium and sinks to the bottom

Question 27

Use the reactivity series to Predict whether manganese( a metal between akuminum and zinc with a pale purple colour) will react with copper sulphate solution and if it will, write the equation and describe what you would see

Answer 27

Will react Manganese + Copper sulphate solution ——-) manganese sulphate + copper blue solution to very pale purple (almost colourless)

Question 28

What colour is copper sulphate solution

Answer 28

Blue

Question 29

Is there any type of magnesium that has atleast a slight reaction with cold water?

Answer 29

Pure ribbon of magnesium

Question 30

What is the difference between when iron reacts with acid and when it reacts with cold water

Answer 30

Reacts with acid, slow fizzing, green colour, and slightly warm But does not react with cold water unless in the form of steam

Question 31

Write the balanced chemical equation with state symbols for the reaction between lead and silver nitrate

Answer 31

Pb+ 2AgNO3——) Pb(NO3)2 +Ag

Question 32

Oxidizing agent definition:

Answer 32

A substance that oxidizes anither substance by taking electrons away from it

Question 33

What is the most common alloy of iron

Answer 33

Steel

Question 34

Which two elements does the term rusting only apply to

Answer 34

Iron and steel

Question 35

What is the role of salty water in a test tube containing iron that is unsealed

Answer 35

Acts as a catalyst to speed the reaction

Question 36

If i boil the water in a test tube containing iron that is sealed with a bung, will rusting take place and why or why not

Answer 36

Rusting will not take place | Because there is no oxygen present as the boiled water removes dissolved oxygen

Question 37

Do only iron and steel corrode?

Answer 37

No | Other metals corrdoe too

Question 38

Explain why galvanizing is better than a barrier method

Answer 38

With galvanizing, the iron does not rust even if the layer of zinc is scrathed away, because zinc is more reactive than iron so it will react instead of iron But if the barrier layer is scratched, the iron can still rust

Question 39

What is a barrier method

Answer 39

A method that prevents oxygen or water reacting with iron by coating the iron in a different layer

Question 40

Give four examples of substances that can be used for the barrier method

Answer 40

Plastic, grease, paint or oil

Question 41

What is galvanization?

Answer 41

The process of coating iron or steal with a protective layer of zinc to prevent rusting

Question 42

What is sacrficial protection

Answer 42

Process of attaching a more reactive metal to a less reactuve metal to prevent the less reactuve metal from corroding

Question 43

Write the balnced symbol equation with state symbols for the proccess of rusting

Answer 43

4Fe(s) + 3O2(g) + XH20(l) ——) 2Fe2O3.XH2O(s)

Question 44

Write the oxidation, reduction and redox reaction for rust

Question 45

What is the chemical name for rust

Answer 45

Hydrated iron(iii) oxide

Question 46

How can rusting destriy a metal

Answer 46

Bceause it can flake off a surface Which once peeled removes a new fresh layer Which continuously flakes off

Question 47

In the reaction of the production for hydrated (iii) iron oxide, which element is being oxidized and which element is being reduced and what is the spectator ions

Answer 47

Iron is being oxidized Oxygen is being reduced H2O is the spectator ion

Question 48

When water reacts with copper sulphate, what is the colour change

Answer 48

White —-) blue

Question 49

Copper is added to hydrochloric acid but there is no temperature change. Explain why this is

Answer 49

Because copper does not react with hydrochloric acid

Question 50

melting point of calcium=850 MP of calcium fluoride = 1418 Mp of neodymium= 1024 Neodymium fluoride= 1410 If the temperature in a container is 1100 Which two substances are solids at this point?

Answer 50

Calcium fluoride | Neodymium fluoride

Question 51

Mixture of aluminium powder and iron (iii) oxide is an exothermic reaction. This reaction can be used where the iron is turned molten and put into moulds for joints. Why is the iron molten?

Answer 51

Because it has reached its melting point

Question 52

When measuring a temperature change, why is it better to keep the number of moles the same rather than the number of grams?

Answer 52

Because number of moles =how many particles are present, so if more particles are present in one substance, more heat would be given off Making it an unreliable test

Question 53

What type of reaction is the reaction between copper and silver nitrate

Answer 53

Displacement reaction

Question 54

In an experiment with zinc and hydrochloric acid, explain how increases the mass will affect the experiment and how increasing the temperature will increase the experiment

Answer 54

Increasing mass means more volume of hydrogen given off | Increasing temperature means a faster rate of reaction

Question 55

Copper is placed into a test tube with hydrochloric acid but there is not temperature change. Explain why

Answer 55

Because copper does not react with hydrochloric acid. | DO NOT SAY BC COPPER IS UNREACTIVE

Question 56

If I use the same mass of magnesium but react with it a larger volume of acid, explain what happens in terms of temperature change

Answer 56

Less of a temperature change because larger volume of water for heat to travel through