Science Revision

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31 Terms

1

Total Internal Reflection occurs when light meets a less dense medium at an angle of incidence larger than the __________.

critical angle

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2

The angle of incidence which causes the angle of reflection to be __________ degrees is known as the critical angle.

90

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3

In the Benedict Test for reducing sugars, the original colour is __________ and a positive test shows __________.

blue; orange/brick red

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4

In the Iodine Test for starch, the original colour is __________ and a positive test shows __________.

orange/brown; blue/black

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5

The original colour of the Biuret Test for protein is __________ and a positive test turns __________.

blue; violet/purple

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6

For lipids, the Ethanol Test shows cloudy __________ forming upon a positive result.

emulsification

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7

An acid has a pH of less than __________.

7

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8

A salt is formed when the metal ions replace the __________ ions in an acid.

hydrogen

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9

Only metals that are above __________ in the reactivity series will react with dilute acids.

hydrogen

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10

When a dilute acid reacts with a metal, a __________ and __________ are formed.

salt; hydrogen

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11

Neutralisation occurs when an acid and __________ react together.

base

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12

When an acid reacts with a metal oxide, __________ and __________ are formed.

salt; water

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13

When an acid reacts with a metal hydroxide, __________ and __________ are formed.

salt; water

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14

When an acid reacts with a metal carbonate, a __________, water, and __________ are formed.

salt; carbon dioxide

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15

Acid turns blue litmus __________.

red

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16

When an acid is added, methyl orange turns __________.

red

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17

Aqueous solutions of acids contain __________ ions.

H+

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18

Aqueous solutions of alkalis contain __________ ions.

OH-

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19

On the pH scale, 0 is very __________ and 14 is very __________.

acidic; alkaline

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20

Acids have a high concentration of __________ ions.

hydrogen

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21

Alkalis have a __________ concentration of hydrogen ions.

low

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22

Neutral solutions have a pH of __________.

7

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23

Yellow, orange, or red colours from a universal indicator indicate ______________.

acidity

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24

Blue or violet colours from a universal indicator indicate ______________.

alkalinity

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25

Neutral solutions will show as __________ using a universal indicator.

green

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26

Acids are known as __________ since they release hydrogen ions.

proton donors

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27

Bases are known as __________ since they accept hydrogen ions.

proton acceptors

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28

A strong acid completely __________ in aqueous solution.

dissociates

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29

A weak acid is an acid that only __________ dissociates in aqueous solution.

partially

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30

HCl is known as a __________ acid.

strong

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31

Ethanoic acid is known as a __________ acid.

weak

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