Chapter 6 Flashcards Preview

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Flashcards in Chapter 6 Deck (39):
1

Exothermic? Example

Gives out heat
Candle burning

2

Endothermic? Example

Absorbs heats
Melting ice

3

Bases- pH level

High pH (8-14)

4

Base- taste

Bitter

5

Base- universal indicator colour

Blue

6

Strong base

Sodium hydroxide

7

Weak base

Ammonia

8

Acids- pH level

Low pH (1-6)

9

Acids- taste

Sour

10

Acids- universal indicator colour

Red

11

Strong acid

Sulfuric acid

12

Weak acid

Carbonic acid

13

Alkalis?

Bases that dissolve in water

14

What do we use to determine the pH levels of acids and bases

Litmus paper and universal indicator

15

Pure water pH level

7

16

What else can be used as indicators

Veggies, example is red cabbage

17

Neutral pH?

7

18

Chemical equation for acid and base

Acid + base --> a salt + water

19

Example of a acid + base reaction

Sodium hydroxide + hydrochloride acid --> water + sodium chloride

20

Metal carbonate and acid reaction?

Metal carbonate + acid --> salt + water + carbon dioxide

21

Neutralisation reaction:

When an acid and a base react with each other, producing a salt and water

22

What have caused the oceans to become acidic?

Rising levels of carbon dioxide in the atmosphere

23

What do oceans absorb?

Carbon dioxide

24

When carbon dioxide dissolves in water, what if formed?

Carbonic acid

25

Why are carbon dioxide levels higher

Because of the increase of burning fossil fuels

26

What happens to the coral in the carbon filled oceans?

Coral is built from calcium carbonate, a weak base. When this reacts with the acid water, it slowly naturalises and crumbles away

27

Chemical equation for a metal and acid react?

Metal + acid --> hydrogen + salt

28

What causes acid rain?

Carbo dioxide in the atsmophere

29

PH level of acid rain

3

30

What is acid rain corrosive too?

Building materials, marble and limestone

31

Define corrosion:

The slow destruction of material as it reacts with its environment

32

How can we protect metals from rust and corrosion?

By painting or galvanising them

33

Metal and oxygen react to create...

Metal oxide

34

Define a combustion reaction:

An exothermic reaction between fuel and oxygen that produces heat, carbon dioxide and water

35

Iron oxide?

Rust, a red-brown flaky substance

36

What do hydrocarbons contain?

Hydrogen and carbon

37

What can you purchase in Australia?

Petrol that contains alcohol

38

What is a biofuel?

Fuel made up of recently grown plants

39

How do alcohols burn?

More cleanly