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End of yr exams - yr 9 > Science > Flashcards

Science Flashcards

1
Q

What are protons?

A

Positive charge

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1
Q

What are atoms?

A

Smallest part of matter and consist of protons, neutrons, and electrons

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2
Q

What are neutrons?

A

Neutral

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3
Q

What are electrons?

A

Negative charge

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4
Q

What is an independent variable?

A

Variable thats changed

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5
Q

What is the dependant variable?

A

Variable thats measured

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6
Q

What is a control variable?

A

Variable kept the same

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7
Q

What is fertilisation?

A

The fusion of male garmetes

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8
Q

What is some evidence for chemical change?

A

Colour, New gas or substance, Absorption of heat

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9
Q

What is a compound?

A

Any substance with 2 or more elements

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10
Q

What is a mixture?

A

A material with 2 or more substances

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11
Q

What is a molecule?

A

2 or more atoms held together by a chemical bond

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12
Q

What is solute?

A

A substance you dissolve

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13
Q

What is solvent?

A

A liquid you dissolve

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14
Q

What is a solution?

A

The mixture formed from the solute and solvent

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15
Q

What is soluable?

A

Able to be dissolved

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16
Q

What is insoluble?

A

Unable to be dissolved

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17
Q

What is dilution?

A

Solvent is added to the solution to make it more dilute

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18
Q

What is filtration?

A

Used to seperate insoluble particles

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19
Q

What is distillation?

A

Used to seperate 2 liquids

20
Q

What is the only energy visible to human eye?

A

Light

21
Q

What form of energy is light?

A

Electromagnetic radiation

22
Q

What are the properties of light?

A

wave length, frequency,energy,speed

23
Q

What is the law of reflection?

A

The light ray going in is the incident ray, the light ray going out is the reflected ray and the imaginary line in the middle is called the normal

24
Q

What is convex?

A

Bounces off and spreads out the rays

25
Q

What is concave?

A

Tarvels inwards

26
Q

What colours make cyan?

A

Green,blue

27
Q

What colours make magenta?

A

blue,red

28
Q

What colours make yellow?

A

red,green

29
Q

What is a medium?

A

A medium is something sound waves need to travel through

30
Q

Explain white light:

A

This is a combination of all colours and when it hits a surface it absorbs all the colours and on reflects the colour you see.

31
Q

How fast does sound travel?

A

340m/s

32
Q

How fast does light travel?

A

300 000 000m/s

33
Q

Why does light travel at different speads?

A

Because of the different densities, e.g solid,liquid,gas

34
Q

What is deficiency?

A

This happens when the body dosen’t get the right amount of nutrients

35
Q

What is villi?

A

Tiny projections made up of cells

36
Q

What is a pancreas?

A

Controls blood sugar levels

37
Q

What is the liver?

A

Produces bile and stores products of digestion

38
Q

What is reflection?

A

When light or sound bounces off a surface back to us

39
Q

What is refraction?

A

The bending of light or sound waves

40
Q

What is kinetic energy?

A

Something moving

41
Q

Do energy particles expand?

A

No, they mover side to side

42
Q

What is the law of conservation energy?

A

Energy can be changed from one to another but can’t be created or destroyed

43
Q

What is conduction?

A

Heat transferred through direct contact

44
Q

What is radiation?

A

Heat travelling in waves

45
Q

What is covection?

A

Heat moving through liquids or gases

46
Q

What are 2 active forms of energy?

A

kinetic, thermal

47
Q

What are 2 potential forms of energy?

A

gravitational, elastic

48
Q

What is a convection current?

A

A circular motion of heat

End of yr exams - yr 9 (5 decks)

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