EXAM Flashcards

1
Q

electrons

A

negative

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2
Q

neutrons

A

neutral (no charge)

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3
Q

how do you calculate the number of neutrons

A

atomic mass (rounded) - atomic number

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4
Q

what is the central area of an atom called

A

the nucleus

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5
Q

what is the law on conservation of matter

A

matter can never be destroyed or created but it can be changed

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6
Q

physical change definition

A

a chnage where the matter looks different but is still made of the same substance or chemical

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7
Q

chemical change definition

A

a chnage where a new substance is formed

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8
Q

how can you know it’s a chemical chnage

A
  • a new solid has formed
  • a new gas has formed
  • a new colour is visible that doesn’t go away
  • a change im temperature
  • a pH change
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9
Q

what is a chemical reaction

A

when you mix two or more chemicals and get new chemicals

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10
Q

what are the chemicals you mix called

A

reactants

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11
Q

what are the new chemicals you make called

A

products

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12
Q

solid to liquid

A

melting

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13
Q

gas to liquid

A

condensation

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14
Q

solid to gas

A

sublimation

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15
Q

liquid to solid

A

solidification

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16
Q

gas to solid

A

deposition

17
Q

liquid to gas

A

boiling of evaporation

18
Q

another term for solidification

A

freezing

19
Q

another term for liquefaction

A

melting

20
Q

another term for boiling

A

evaporation

21
Q

another term for vaporization

A

evaporation or boiling

22
Q

molecules (solid is being heated)

A
  • particles are very close

* barely moving

23
Q

molecules (melting)

A
  • some particles are close some are moving apart

* moving slowly

24
Q

molecules (heating liquid)

A
  • particles are all separated

* moving at medium speed

25
Q

molecules (boiling evaporation)

A
  • particles widely separated

* moving quickly

26
Q

what phase chnage occurs when wet clothes dry outside

A

evaporation

27
Q

what is an example of sublimation

A

the solid stick deodorant in the bathroom giving off its odour

28
Q

what is characteristics

A

things that we can use to describe something

29
Q

characteristic properties

A

things that can be used to identify sonethig

30
Q

non characteristic properties

A

things that can be described something but not identify what is it