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Yr8-Science > Science Revision Test 3 > Flashcards

Science Revision Test 3 Flashcards

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1
Q

What is the definition for elastic deformation?

A

Object returns to original shape after stretching or compressing

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2
Q

What is the definition for inelastic deformation?

A

Object is unable to change shape

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3
Q

State Hooke’s Law

A

The extension of the spring is directly proportional to the force applied. This means that if you double the force, the extension also doubles.

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4
Q

State Hooke’s Law equation

A

Force = spring constant x extension (F= ke)

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5
Q

Describe what happens to a spring when it is stretched beyond the limit of proportionality

A

The shape has changed irreversible

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6
Q

List the equipment used for the Hooke’s law experiment

A

Sprint, retort stand/ clamp stand, clamp and boss, masses, ruler

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7
Q

State the pressure equation

A

Pressure = force / area (P=F/A)

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8
Q

Explain everyday uses of pressure

A

Snow shoes walking in snow (bigger surface area)

Camels walking on the sand

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9
Q

Explain how a bed of nails work

A

The weight of the person is spread across a bed of nails, meaning the pressure is spread across these small points.

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10
Q

What is an independent variable?

A

What you change

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11
Q

What is a dependant variable?

A

What you measure

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12
Q

What is a control variable?

A

What you keep the same

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13
Q

Write 2 facts about pressure in liquids

A

The pressure acts all around and increases with depth

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14
Q

What is air pressure affected by?

A

Quantity of particles & temperature

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15
Q

Why is the pressure at the top of a mountain less than at the bottom?

A

There a fewer particles

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16
Q

What is the law of conversation of mass

A

Total mass of reactants = total mass of products

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17
Q

Write the formula for water, carbon dioxide, oxygen and hydrogen

A

H2O, CO2, O2, H2

18
Q

Write the general equation for metals reacting with water

A

Metal + water —> Metal hydroxide + Hydrogen

19
Q

Write the general equation for metals reacting with acid

A

Metal + acid —> Salt + hydrogen

20
Q

How does this acid name change when added to a metal

A

Hydrochloride makes chlorides
Sulphuric makes sulphates
Nitric makes nitrates

21
Q

Define combustion

A

Burning in oxygen producing heat and light

22
Q

Write the general equation for metals reacting with oxygen (air)?

A

Metal + oxygen —> Metal Oxide

23
Q

State the order of the reactivity series

A

Potassium, Sodium, Calcium, Magnesium, Aluminium, Carbon, Zinc, Iron, Lead, Copper, Silver, Gold

24
Q

Why is carbon placed in the reactivity series when it’s not a metal?

A

Carbon can be used to displace the metals below from their compounds

25
Q

What is the rule for naming 2 elements together in a compound?

A

Name ends in -ide

26
Q

What is the rule for naming 3 elements together in a compound, with one containing oxygen?

A

Name ends in -ate

27
Q

Which side of the arrow in an equation shows the reactants?

A

The left side

28
Q

Which side of the arrow in an equation shows the products?

A

Right side

29
Q

Write a word equation to make sodium chloride from sodium and chlorine

A

sodium + chlorine —> sodium chloride

30
Q

How do you test for the presence of hydrogen?

A

Lit splint will go pop (squeaky pop test)

31
Q

What shows a chemical reaction has happened?

A

Light produced, colour or temperature change, has given off (bubbles)

32
Q

What is a displacement reaction?

A

Where a more reactive metal (or carbon) displaces a less reactive metal from the compound

33
Q

Can magnesium displace iron from iron oxide

A

Yes because magnesium is more reactive than iron

34
Q

Can calcium displace sodium from sodium oxide?

A

No because sodium is more reactive than calcium

35
Q

Why is carbon used to extract iron from iron oxide?

A

Carbon is more reactive than iron so it can displace the iron

36
Q

Define electrolysis

A

Splitting compounds into individual elements using electricity

37
Q

What state does the compound need to be in for electrolysis?

A

Molten (liquid) or in solution

38
Q

What are the changes in the electrodes in electrolysis?

A

Positive & negative

39
Q

What happens in electrolysis?

A

Opposite charged ions are attracted to an electrode

40
Q

What can electrolysis be used for?

A

Electroplating jewellery, purifying copper, extracting aluminium

41
Q

Write the general word equation for the reaction of metal oxides with acid

A

Metal oxide + acid —> salt + water

42
Q

How would you separate an insoluble solid from a solution & then obtain crystals?

A

Filter the insoluble solid the leave the solution to evaporate leaving crystals behind

Yr8-Science (8 decks)

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