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science Flashcards

1
Q

What are the types of energy?

A

LE KE CPE GPE EPE EE HE SE

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2
Q

How do we feel hot and cold?

A

produced by thermoreceptors, which are nerve cells found in the skin that can detect differences in temperature.

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3
Q

How does insulation work?

A

by slowing conductive heat flow and convective heat flow

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4
Q

How does heat travel by conduction, convection and radiation?

A

In CONVECTION, heat energy is carried by the movement of particles of matter. In CONDUCTION, heat is transferred by particles vibrating. In RADIATION, heat is carried directly by electromagnetic waves.

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5
Q

How do our lenses allow us to see?

A

The lens works together with the cornea to focus light correctly on the retina.

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6
Q

how is light received in the eye and sent to the brain?

A

The light is turned into electrical signals and sent to the brain.

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7
Q

what is energy?

A

it is the ability to do work

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8
Q

what is the job of the iris?

A

coloured tissue that changes size to open and close the pupil

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9
Q

What is the job of the conjunctiva?

A

Thin protective layer over the surface of the eye

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10
Q

What is the job of the pupil?

A

Hole or opening, through where the light enters the eye

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11
Q

What is the job of the lens?

A

Focuses light from different distances - can change its size

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12
Q

what is the job of the retina?

A

Nerve cells that collect light and send to the optic nerve

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13
Q

what is the job of the eyelid?

A

Cover of eye to block out light and help keep moist

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14
Q

what is the job of the cornea?

A

Main lens, used to focus light entering the eye onto the retina

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15
Q

what is the job of the optic nerve?

A

large nerves that send all images to the brain to be processed

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16
Q

what is the job of the eyelash?

A

protects the eye from dust, dirt or sand

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17
Q

what is the job of the sclera?

A

helps to protect the eye and maintain the shape of the eyeball

18
Q

What is it about an object that allows us to see it as a colour?

A

Some objects reflect more of a certain wavelength of light than others

19
Q

What are the rules of reflection?

A

1) The incident ray, reflected ray and normal lie on the same plane. 2) Angle of incidence is equal to angle of reflection

20
Q

Why do objects under coloured lights appear different colours than normal?

A

Because the object reflects more than one colour of light

21
Q

How do images appear in mirrors?

A

When the mirror reflects light, it forms an image.

22
Q

Where do images appear in mirrors?

A

The same distance the object is from the mirror it is looking into the mirror

23
Q

How can light be refracted?

A

Light refracts whenever it travels at an angle into a substance with a different refractive index.

24
Q

How does refraction change things in our lives?

A

with out refraction our vision would be a blur

25
Q

what problems can UV cause?

A

UV can cause bad eyesight, premature aging and wrinkly skin. Sunburn which can lead to skin cancer.

26
Q

what is UV?

A

A form of electromagnetic radiation that has shorter wavelengths then visible light

27
Q

How can we stop UV causing problems?

A

Limit time in sun, Slip slop slap and wrap, stay in shade, always use sunscreen.

28
Q

What is the difference between elements and compounds?

A

Elements are made from one atom. Compounds are formed by two or more types of elements.

29
Q

An atom’s basic structure?

A

An arrangement of protons, neutrons and electrons

30
Q

What is the Chemical symbol for Fluorine?

A

F

31
Q

what is the symbol for magnesium?

A

Mg

32
Q

what is the symbol for sodium

A

Na

33
Q

What is the symbol for hydrogen

A

H

34
Q

what is the symbol for helium

A

He

35
Q

what is the symbol for lead

A

Pb

36
Q

what is the symbol for copper

A

Cu

36
Q

what is the symbol for silver

A

Ag

37
Q

What is the symbol for gold

A

Au

38
Q

what is the symbol for iron

A

Fe

39
Q

what is the number for sulphate

A

4

40
Q

what is the number for carbonate

A

3

41
Q

what is the number oxide

A

2

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