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Science > Unit 3 > Flashcards

Unit 3 Flashcards

(52 cards)

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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

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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

Study These Flashcards
A

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

23
Q

Heat

Study These Flashcards
A

Measures of total thermal kinetic energy of vibrating particles

Thermal energy is transferred betweeen objects

24
Q

Which unit measures heat

25
Which unit measures temperature
Celsius
26
Is energy transferred between objects
True
27
Can thermal energy be stored in an object
True
28
What will happen to heat in evaporation
It will dissipate into its surro
29
When the temperature of a cup of water is higher what happens to the particles compared to a cup with cold temperature
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
When most the temperature be measured
When thermal equilibrium is reached
31
How can you avoid changing the temperature of the the substance being measured while used a theeemoter
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
Water is 15 degrees and heat is 60 degrees what happens
Thermal energy is transferred because of the difference in temperatures
33
Laws of energy
Energy is measured in joules Energy is stored (conserved) Emery can be transferred Energy is not created or destroyed
34
What is the thermal energy when 1000j is the electrical energy and 500j is the kinetic energy
Thermal energy is 500J
35
How does thermal energy move
It moves from hot place to cold place
36
What happens to the thermal energy
Thermal energy moves from the drink through the container and into your hands
37
Food in a fridge thermal energy
When you put food into a refrigerator thermal energy transfers out of the food, and the food becomes colder
38
Water inside a car
There is water inside a car engine to remove thermal energy from the metal engine parts. This stops the engine overheating
39
Elephant in water
Animals sometimes go in water to cool down. Thermal energy moves from the animals body into the colder water
40
When thermal energy is removed from a hot object , we say that the thermal energy has
Dissipated
41
What is dissipation
Described the movement of energy from hot to cold place Energy has dissipate from the hotter place
42
What is cold
Cold is not an energy store and cold cannot move. Cold means there is less thermal energy
43
What happens when you hold ice
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
What happens when you open a window and it’s colder outside
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
Heat is the type of energy called
Thermal energy
46
What are the 3 processes which move heat
1) conduction 2) convection 3) radiation
47
Thermal energy moves from
Hot to cold
48
Conduction only occurs in
Solids Like copper silver aluminum gol
49
Which solids don’t conduct heat
Paper glass rubber porcelain ceramic plastic
50
What is fluids
Liquid and gases can both flow and behave in similar ways
51
How does heat travel through space
The earth is warmed by heat energy from the sun
52
How does this heat energy travel from the sun to the earth
There are no particles between the sun and the earth do the heat cannot travel by conduction or by convection

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