Chemestry Flashcards

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1
Q

What does combustion (burning) make? And what is the word equation?

A

Carbon dioxide + water

E.g. Methane + oxygen = carbon dioxide + water

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2
Q

What is thermal decomposition? And what is the word equation?

A

Is the breaking down of a compound using heat

Copper carbonate = copper oxide + carbon dioxide

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3
Q

What does thermal decomposition of metal carbonates always produce?

A

Carbon dioxide gas

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4
Q

What is the test for carbon dioxide gas?

A

Is that it turn limewater cloudy

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5
Q

Why do chemical reactions combine reactants?

A

To make new products

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6
Q

On the periodic table what does the staircase divide?

A

Metals from non-metals

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7
Q

Why groups go down down the line?

A

Because the elements have similar properties

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8
Q

Where are groups?

A

Vertical

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9
Q

Where are periods on the periodic table?

A

Horizontal

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10
Q

What do elements in the same group have?

A

Similar properties e.g appearance, melting point, and reactions with other elements

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11
Q

What is an alkali?

A

A base that is soluble in water e.g calcium oxide is a vase and sodium hydroxide is an alkali

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12
Q

What’s the process of neutralisation

A

Acid + alkali = salt + water

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13
Q

What is a use for neutralisation?

A

In digestion pills are alkaline so they neutralise excess acid in the stomach

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14
Q

PH 0

A

Red - battery acid

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15
Q

PH1

A

Light red - hydrochloric acid secreted from the stomach lining

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16
Q

PH2

A

Orange - lemon juice 2.3 vinegar 2.9

17
Q

PH3

A

Yellow - grape and orange juice , soft drink

18
Q

PH4

A

Light green - tomato juice 4.1

19
Q

PH5

A

Green - acid rain 5.6 black coffee 5

20
Q

PH6

A

Green - urine 6 milk 6.6

21
Q

PH7

A

Green - pure water 7

22
Q

PH8

A

Aqua green - baking soda 8.4, seawater, eggs

23
Q

PH9

A

Turquoise - toothpaste 9.9

24
Q

PH10

A

Blue - milk of magnesium 10.5

25
Q

PH11

A

Navy blue - household ammonia 11.9

26
Q

PH12

A

Purple - soapy water

27
Q

PH13

A

Purple - bleaches, oven cleaner

28
Q

PH14

A

Purple - liquid drainer, caustic soda