Moles And Titrations

Question 1

The more solute you dissolve in a given volume…?

Answer 1

The more crowed the solute molecules are and the more concentrated the solution

Question 2

1000cm3=?

Answer 2

1dm3

Question 3

What can Titrations allow you to do?

Answer 3

To find out how much acid is needed to neutralise a quantity of alkali or vice versa

Question 4

How do you do this titration?

Answer 4

1) put alkali in flask with some indicator - not universal as it only changes colour gradually use methyl orange
2) add acid bit at a time and the indicator will change colour when all all alkali has been neutralised, yellow in alkalis but red in acids
3) record how much acid need to neutralise and repeat

Question 5

Concentration = moles / volume

Answer 5

moles / volume

Question 6

Energy must always be supplied to…?

Energy is always released when…?

Answer 6

Break bonds - endothermic

When bonds form - exothermic

Question 7

How is fuel energy calculated?

Answer 7

Using a calorimetry

Question 8

What are the consequences of fuels providing energy?

Answer 8

Global warming and climate change

Non renewable - becoming more expensive

Question 9

What is shown in a exothermic graph?

Answer 9

The products are at lower energy then the reactants

Question 10

What does the endothermic graph show?

Answer 10

Products are at a higher energy than the reactants

Question 11

What is activation energy?

How can it be lowered?

Answer 11

Represents the minimum energy needed by reacting particles to break their bonds
By adding a catalyst

Question 12

Hydrogen + oxygen –> ?

Answer 12

Water

Exothermic reaction

Question 13

What are the pros for burning hydrogen gas in oxygen to make a fuel?

Answer 13

Very clean as it only forms water

Question 14

What are the cons?

Answer 14

Need special expensive equipment

Question 15

What’s a fuel cell?

Answer 15

Electrical cell that’s supplied with a fuel and oxygen and uses energy from the reaction between them to generate electricity

Question 16

Why isn’t hydrogen very reliable new source of fuel?

Answer 16

• takes up space to store

- explosive

Question 17

How could you test for metal ions/positive ions?

Answer 17

Putting your substance into a flame and see what colour it goes

Question 18

What colour does lithium go?

Answer 18

Crimson

Question 19

What colour does sodium go?

Answer 19

Yellow

Sun is yellow

Question 20

What colour does potassium go?

Answer 20

Lilac

Lisa pregnant

Question 21

What colour does calcium go?

Answer 21

Red

Christmas is red

Question 22

What colour does barium go?

Answer 22

Green

Bear Grils

Question 23

How else could you test for positive ions?

Answer 23

Add a few drops of sodium hydroxide solution to your compound

Question 24

What colour of precipitate does calcium 2+ form?

Answer 24

White

Cats are white

Question 25

What colour of precipitate does copper 2+ form?

Answer 25

Blue Cops have blue lights on their police cars

Question 26

What colour of precipitate does iron 2+ form?

Answer 26

Green

Question 27

What colour of precipitate does iron 3+ form?

Answer 27

Brown

Question 28

What colour of precipitate does aluminium 3+ form?

Answer 28

White --> the. A colourless solution

Question 29

What colour of precipitate does magnesium 2+ form?

Answer 29

White Medicine is usually white

Question 30

How to test for carbonates - negative ions?w

Answer 30

Test to see if carbon dioxide is present - bubble through limewater and if it goes cloudy ITS ORESENT

Question 31

How can you test for halide ions?

Answer 31

Add dilute nitric acid followed by silver nitrate solution

Question 32

Chloride gives a...?

Answer 32

White precipitate of silver chloride

Question 33

Bromide gives a...?

Answer 33

Cream precipitate of silver bromide

Question 34

An iodide gives a...?

Answer 34

Yellow precipitate of silver iodide

Question 35

How can you test for sulphate ions?

Answer 35

Add dilute hydrochloric acid followed by barium chloride solution A white precipitate means the original compound was a sulphate