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Science: chemical reactions > Test Revision > Flashcards

Test Revision Flashcards

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1
Q

List as many facts about bases as possible

A 
bitter
Slippery
May be corrosive
Neutralised by acids
Affect the colour of certain dyes
Ph is greater than 7
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2
Q

On which side of the equation is the reactants?

A

Left

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3
Q

Which number range on the ph scale would a weak acid have?

A

Ph 3-6

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4
Q

Explain how a cold pack works

A

Cold packs work to draw heat out of an injury and reduce swelling and bruising

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5
Q

List as many facts about acids as possible

A 
Sour
Corrosive
Dissolve in water to produce hydrogen
Neutralised by bases
Affect the colour of some dyes
Ph is less than 7
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6
Q

An example of a substance with a ph of 7

A

Uncontaminated water

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7
Q

On which side of the equation do the products appear?

A

Right

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8
Q

List as many examples of acids as possible

A 
Stomach acid
Nitric acid
Battery acid
Carbonic acid
Phosphoric acid
Vinegar
Citric acid
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9
Q

Do the products of an exoteric reaction have more or less energy than the reactants?

A

Exothermic reactions produce energy so there is more energy in the products

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10
Q

What number range, on the ph scale would a strong base have

A

Ph 10-14

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11
Q

What are the types of chemical reactions?

A 
Synthesis
Decomposition
Single replacement 
Double replacement 
Combustion
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12
Q

What is synthesis?

A

A+B->AB

2 becomes 1

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13
Q

What is decomposition?

A

AB->A+B

1 becomes 2

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14
Q

What is single replacement?

A

A+BC->B+AC
A+BC->C+BA
Loners got a friend

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15
Q

What is double replacement?

A

AB+CD->CB+AD

Wife swap

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16
Q

What is combustion?

A

CH4 + 2O2 -> 2H2O + CO2
C3H3 + 5O2 -> 4H2O + 3CO2
Organic compounds react with oxygen to form carbon dioxide and water

17
Q

What number range on the ph scale would a weak base have?

A

Ph 7-10

18
Q

What is an endothermic reaction?

A

A reaction that needs energy to start so it would have more energy in the reactants

19
Q

What are some examples of bases?

A 
Sodium hydroxide
Potassium hydroxide
Calcium hydroxide
Calcium carbonate
Sodium carbonate
Calcium bicarbonate 
Ammonia
Ammonium hydroxide
20
Q

Is a chemical reaction the same thing as a physical reaction?

A

A chemical reaction is a permanent change where as physical changes are reversible

21
Q

What is the law of conservation of mass?

A

When matter cannot be created or destroyed in a chemical reaction, just rearranged

22
Q

What is an example of a chemical reaction

A

Baking a cake because you cannot separate the components again

23
Q

What is an exothermic reaction?

A

When energy is released from a reaction, that is, there is more energy in the products than the reactants

24
Q

In what number range on the ph scale would pure water be?

A

If it it completely pure- ph7

25
Q

Does potassium nitrate cause an endothermic reaction or an exothermic reaction?

A

Endothermic reaction

26
Q

An example of a physical reaction

A

Water evaporating because it is only a change of state and is reversible

27
Q

What is cellular respiration?

A

The conversion of glucose into energy- the oxidisation of glucose- the opposite of photosynthesis

28
Q

What number range on the ph scale would a strong acid be?

A

Ph 0-3

29
Q

What is photosynthesis?

A

The opposite to cellular respiration, the process by which plants, some bacteria and some protistans use sunlight energy to produce glucose from carbon dioxide and water

30
Q

Do the products of an endothermic reaction have more or less energy than the reactants?

A

Reactants

31
Q

Does calcium chloride cause an endothermic or exothermic reaction?

A

Endothermic

32
Q

How does a hot pack work?

A

Hot packs help to relieve pain by stimulating your sensory receptors to block pain signals to the brain

33
Q

What is the best way to combat the swelling of a rolled ankle?

A

Use RICE: rest, ice, compression &a elevation. The ice, compression and elevation reduce the amount of blood rushing to the are to reduce the amount of swelling, bruising and long term pain

Science: chemical reactions (1 decks)

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