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Science > Unit 3 > Flashcards

Unit 3 Flashcards

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1
Q

Which of these has a larger volume
1kg of rocks or 1kg feathers

A

Feathers

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2
Q

1cm of ploystyrene
1 cm of iron
Which of these has larger mass

A

Iron

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3
Q

What does hollow mean

A

They have space filled with air inside them

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4
Q

What does solid mean

A

No space with air

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5
Q

Example of hollow

A

Pencil case
Jar
Box
Water bottle

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6
Q

Example of solid

A

Table
Chair
iPad
Bed

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7
Q

What is density use to describe

A

The difference

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8
Q

Meaning of regular

A

Shape having a volume that can be calculated using an equation

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9
Q

Meaning of density

A

Property( space , volume) of an object

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10
Q

Meaning of mass

A

Measurements of the object

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11
Q

Meaning of irregular

A

Shape having a volume that cannot be calculated using an equation

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12
Q

Calculate volumes

A

Multiply each length of the sides

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13
Q

How do you measure the volume of a rock

A

You place it with a cylinder with water but befor hand you have to measure the water then you add the rock and see how much the water rises then you calculotje before and after by subtracting it

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14
Q

How do you calculate the mass

A

Density x volume

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15
Q

How do you calculate the density

A

Mass/ volume

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16
Q

How do you calculate the volume

A

Mass/ density

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17
Q

Gases are than liquids

A

Less dense because the particles in a gas are much farther than a liquid

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18
Q

Gases have lower …. Than solids or liquids

A

Density

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19
Q

When will an object sink

A

When it’s more dense then water

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20
Q

Temperature

A

The direction the thermal energy will be transferred
And the average energy of the particles in an object

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21
Q

Heat

A

Heat is a measure of the energy in the particles
Heat is the total thermal energy of the vibrating particles in an object

22
Q

Temperature

A

Measure the average thermal kinetic energy of the particles
- direction of Thermal energy transferred

23
Q

Heat

A

Measures of total thermal kinetic energy of vibrating particles

Thermal energy is transferred betweeen objects

24
Q

Which unit measures heat

A

Joules

25
Q

Which unit measures temperature

A

Celsius

26
Q

Is energy transferred between objects

A

True

27
Q

Can thermal energy be stored in an object

A

True

28
Q

What will happen to heat in evaporation

A

It will dissipate into its surro

29
Q

When the temperature of a cup of water is higher what happens to the particles compared to a cup with cold temperature

A

They move at higher speed the number of particles are the same but the total thermal energy (heat) of the particles of the water with the highest temperature is higher

30
Q

When most the temperature be measured

A

When thermal equilibrium is reached

31
Q

How can you avoid changing the temperature of the the substance being measured while used a theeemoter

A

Always read a thermometer after it has stopped rising or falling
At this point equilibrium has been reached between the thermometer and the substance

32
Q

Water is 15 degrees and heat is 60 degrees what happens

A

Thermal energy is transferred because of the difference in temperatures

33
Q

Laws of energy

A

Energy is measured in joules
Energy is stored (conserved)
Emery can be transferred
Energy is not created or destroyed

34
Q

What is the thermal energy when 1000j is the electrical energy and 500j is the kinetic energy

A

Thermal energy is 500J

35
Q

How does thermal energy move

A

It moves from hot place to cold place

36
Q

What happens to the thermal energy

A

Thermal energy moves from the drink through the container and into your hands

37
Q

Food in a fridge thermal energy

A

When you put food into a refrigerator thermal energy transfers out of the food, and the food becomes colder

38
Q

Water inside a car

A

There is water inside a car engine to remove thermal energy from the metal engine parts. This stops the engine overheating

39
Q

Elephant in water

A

Animals sometimes go in water to cool down. Thermal energy moves from the animals body into the colder water

40
Q

When thermal energy is removed from a hot object , we say that the thermal energy has

A

Dissipated

41
Q

What is dissipation

A

Described the movement of energy from hot to cold place
Energy has dissipate from the hotter place

42
Q

What is cold

A

Cold is not an energy store and cold cannot move. Cold means there is less thermal energy

43
Q

What happens when you hold ice

A

When you hold ice thermal energy transfers away from your hand and into the ice. You feel cold because thermal energy has been transferred away from your hands.

44
Q

What happens when you open a window and it’s colder outside

A

The inside cools down this is because thermal energy from the hotter inside moves to the colder outside. Cold air may enter the room , but thermal energy from the warmer air is still transferred to the colder air.

45
Q

Heat is the type of energy called

A

Thermal energy

46
Q

What are the 3 processes which move heat

A

1) conduction
2) convection
3) radiation

47
Q

Thermal energy moves from

A

Hot to cold

48
Q

Conduction only occurs in

A

Solids
Like copper silver aluminum gol

49
Q

Which solids don’t conduct heat

A

Paper glass rubber porcelain ceramic plastic

50
Q

What is fluids

A

Liquid and gases can both flow and behave in similar ways

51
Q

How does heat travel through space

A

The earth is warmed by heat energy from the sun

52
Q

How does this heat energy travel from the sun to the earth

A

There are no particles between the sun and the earth do the heat cannot travel by conduction or by convection

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