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year 8 study > chemistry test ﴾ⵙᗝⵙ﴿ > Flashcards

chemistry test ﴾ⵙᗝⵙ﴿ Flashcards

1
Q

any substance that mass and takes up space is called what?

A

matter

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2
Q

what is a particle?

A

the building block of batter

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3
Q

what is a reactant?

A

a substance that is the starting material for a chemical change

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4
Q

what is a Molecule?

A

Smallest part of a substance. They are made up of one or more atoms.

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5
Q

what are Atoms?

A

the smallest particle of a chemical element that can exist.

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6
Q

what is Precipitate?

A
  • A solid formed in some chemical reactions.
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7
Q

what is a Subatomic particle

A

Neutrons, electrons, and protons. a particle smaller than an atom

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8
Q

what is a Neutron?

A

One of the three subatomic particles that make up an atom. Neutrons are neutrally charged.

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9
Q

solid partials have …

A

A fixed volume and shape

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10
Q

liquid particles have…

A

No fixed shape and fixed volume

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11
Q

gas particles have…

A

No fixed volume or shape

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12
Q

what is an element?

A

basic unit of matter/ combination of protons neutrons and electrons

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13
Q

what is a proton

A

It is one of the subatomic particles that make up an atom. protons are positively charged and help with the movement of electrons.

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14
Q

what is a electron

A

it is one of the subatomic particles that make a an atom and carry a negative charge

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15
Q

how many atoms are there in an element

A

one ( an atom is and element )

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16
Q

what does the atomic number tell as

A

number of protons

17
Q

what does the atomic mass/ weight ( mass number ) tell as about an atom

A

number of protons + neutrons

18
Q

what does COBALT stand for ?

A

C- color change O-odor B-bubbles A- appearance or dissidence of substance L- light and sound T- temp change

19
Q

what is COBALT used for

A

it is signs of chemical change

20
Q

what is sublimation

A

solid into gas e.g dry ice

21
Q

what is condensation

A

gas into liquid e.g a can of cold soda

22
Q

protons and electrons are the same T or F

A

T

23
Q

the period number says what?

A

the number of shells

24
Q

the group number says what?

A

the number of electrons on the outer shell

25
Q

how can you identify a physical change

A

reversible change, no new substance, chemical property remain the same, change in shape, state of mater

26
Q

do solid particles move

A

yes they vibrate

27
Q

what particles out of solid liquid and gas moves the fastest

A

gas

28
Q

is gas compressible

A

yes

29
Q

are liquid compressible

A

no

30
Q

are solids compressible

A

no

31
Q

what are the groups on the periodic table

A

1.alkali metals 2. alkaline earth metals 7. halogens 8. noble gases

year 8 study (4 decks)

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