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physics ocr triple > topic 1 key words > Flashcards

topic 1 key words Flashcards

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1
Q

What is the definition for atmosphere?

A

The thin layer of air surrounding the Earth.

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2
Q

What is the Bohr Model?

A

A model of the atom that suggested that negative electrons orbit a positive nucleus at set distances. it is the currently accepted model.

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3
Q

What is the definition for change in thermal energy?

A

The product of mass, specific heat capacity and temperature change of a substance.

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4
Q

What are chemical changes?

A

Changes to the chemical structure of a substance. Not reversable.

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5
Q

What is condensation?

A

The changing from vapour state to a liquid state, when a substance is cooled.

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6
Q

What is density?

A

The mass per unit volume of an object.

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7
Q

What are electrons?

A

A negatively charged constituent of the atom, they are found in different energy levels, around the nucleus.

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8
Q

What is a liquid?

A

A liquid or gas.

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9
Q

What is evaporation?

A

the changing from a liquid state to a vapour state, when a substance is heated.

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10
Q

What is freezing?

A

The changing from a liquid state to a solid state, when a substrate is cooled.

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11
Q

What is a gas?

A

A state of matter in which the particles are spread far apart and have high kinetic energies.

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12
Q

What is latent heat?

A

The energy required for a substance to change state.

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13
Q

What is a liquid?

A

A state of matter in which the particles are in contact, but can flow over each other.

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14
Q

What is melting?

A

The changing from a solid state to liquid state, when a substance is heated.

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15
Q

What is the nucleus?

A

The positively charged centre of an atom, containing protons and neutrons

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15
Q

What are neutrons?

A

A neutrally charged constituent of the nucleus.

16
Q

What are pascals?

A

The unit of pressure, equal to a force of one Newton acting perpendicular to an area of one metre squared.

17
Q

What are physical changes?

A

Changes to the physical properties of a substance which can be reversed.

18
Q

What is pressure in a liquid column?

A

Equal to the product of the height of the column, the density of the liquid and the gravitational field strength.

19
Q

What is pressure?

A

The force acting perpendicular to a surface, per unit area.

20
Q

What is the pressure of a gas?

A

The perpendicular force per unit area acting on the surfaces of a container as a result of the gas particles colliding with it.

21
Q

What are protons?

A

A positively charged constituent of the nucleus.

22
Q

What is the Rutherford model?

A

A model of the atom that represented that atom as being mostly empty space, with a dense positive centre and negative charges scattered around it.

23
Q

What is a solid?

A

A state of matter in which the particles are tightly packed together and can only vibrate about their fixed positions.

24
Q

What is specific heat capacity?

A

The amount of energy needed to increase the temperature of one kg of a substance by 1C.

25
Q

What is specific latent heat pf fusion?

A

the amount of energy needed to change the state of 1kg of a substance of a substance from solid state to liquid state, whilst held at constant temperature.

26
Q

What is specific latent heat of vaporisation?

A

The amount of energy needed to change the state of 1 kg of a substance from liquid state to vapour state, whilst held at constant temperature.

27
Q

What is sublimation?

A

The direct changing of a substance from a solid state to a vapour state, without passing through the liquid phase.

27
Q

What is specific latent heat?

A

The amount of energy needed to change the state of 1kg of a substance, whilst held at constant temperature.

28
Q

What is temperature?

A

A measure of the average kinetic energy of particle in a substance.

29
Q

What is the Thomson model?

A

A rejected model of the atom that represented the atom as a ball of positive charge, c=with negative charges distributed throughout it. plum pudding model.

30
Q

What is upthrust?

A

The upward force acting on an object in a fluid, due to it experiencing a greater pressure below it than above it. It is equal to the weight of the fluid displaced by the object.

31
Q

What is weight?

A

The force acting on an object due to gravity.

physics ocr triple (1 decks)

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