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Science > Reactivity > Flashcards

Reactivity Flashcards

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1
Q

melting salt: chemical or physical change?

A

Physical

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2
Q

Burning petrol: Chemical or physical change?

A

Chemical

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3
Q

Separating sugar from water in a sugar-water solution: Chemical or physical change

A

Physical

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4
Q

Boiling water : Chemical or physical change

A

Physical

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5
Q

Freezing food: Chemical or physical change

A

Physical

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6
Q

Separating sand from a mixture sand and water by filtration: Chemical or physical change

A

Physical

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7
Q

Puddles evaporating: Chemical or physical change

A

Physical

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8
Q

Heating silver oxide to form silver and oxygen: Chemical or physical change

A

Chemical

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9
Q

Lighting a match

A

Chemical

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10
Q

Respiration in cells : Chemical or physical change

A

Chemical

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11
Q

Nail varnish drying: Chemical or physical change

A

Physicalllllllllllll

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12
Q

Leaf rotting : Chemical or physical change

A

Chemical

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13
Q

Wax burning: Chemical or physical change

A

Chemical

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14
Q

Photosynthesis in leaves:: Chemical or physical change

A

Chemical

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15
Q

Condensing stream

A

Physical

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16
Q

Define implosion

A

An object destroyed by collapsing in on itself

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17
Q

What is a physical change

A

A change in which no new substances are formed

18
Q

Give 3 qualities of a physical change

A
  • do not make new substances
  • are often easy to reverse
  • the substances may change state or just be mixed together
19
Q

Give 4 examples of a physical change

A

Melting
Boiling
Condensing
Freezing

20
Q

Give 3 qualities of a chemical reaction

A

-always make at least one new substance
-are usually difficult to reverse
-the new substances have different properties from the original substance
-

21
Q

Give 3 examples of a physical change

A

Combustion
Neutralisation
Thermal decomposition

22
Q

How is gas pressure caused

A

By the force of the particles hitting the walls of the container

23
Q

Why does increasing the temp. increase pressure

A

The particles move faster and they hit the walls of the container more often with more force

24
Q

Why does increasing the number of particles in the container increase pressure

A

The particles are closer together and hit the walls of the container more often

25
Q

Why does decreasing the volume of the container increase pressure

A

The particles are closer together and hit the walls of the container more often

26
Q

Most metals react with oxygen from the air to create what? What is the name of the reaction?

A

They create metal oxides, this is called an oxidation reaction

27
Q

How does potassium react with oxygen, water and dilute acid?

A

Fire,fire, EXPLOSION

28
Q

How does sodium react with oxygen, water and dilute acid?

A

Fire, reacts very quickly and explosion

29
Q

How does lithium react with oxygen, water and dilute acid?

A

Fire, reacts quickly, reacts very quickly

30
Q

How does calcium react with oxygen, water and dilute acid?

A

Fire, reacts quickly, reacts very quickly

31
Q

How does magnesium react with oxygen, water and dilute acid?

A

Fire, reacts, reacts quickly

32
Q

How does aluminium react with oxygen, water and dilute acid?

A

Reacts very quickly, slow or partial reaction

33
Q

How does gold react with oxygen, water and dilute acid?

A

No reaction, no reaction, no reaction

34
Q

Iron and steel need what to rust?

A

Air and water

35
Q

What makes iron and steel rust quicker

A

Salt

36
Q

How can rusting be prevented

A
  • The physical barrier to stop the air and water being in contact with iron
  • sacrificial protection in which blocks of a more reactive metal such as zinc or magnesium are attach to the iron and they then corrode instead of the iron
37
Q

What is a hydrocarbon?

A

These substances contain only hydrogen and carbon

38
Q

What do hydrocarbons supply if burnt?

A

Carbon dioxide and water

39
Q

How do you test for oxygen?

A

It relightes a glowing splint

40
Q

What is a displacement reaction

A

In a displacement reaction a more reactive metal takes the place of a less reactive metal in a compound.

41
Q

Here is an example of a displacement reaction:
Aluminium +iron oxide—-> iron+aluminium oxide
Why does this happen?

A

Aluminium takes the place of iron as it is a more reactive metal and forms stronger bonds with oxygen

42
Q

What is the opposite of oxidation?

A

Reduction- the loss of oxygen

Science (14 decks)

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