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GRADE 9 FLASHCARDS > Chemistry Test Prep > Flashcards

Chemistry Test Prep Flashcards

1
Q

Plum Pudding

A

D: An atom is a positive sphere embedded with negative electrons
Scientist: JJ Thomson

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2
Q

Billiard Ball

A

An atom is solid sphere similar to a billiard ball
Scientist: John Dalton

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3
Q

An atom consists of a tiny positively charged nucleus, surrounded mostly by empty space containing negative electrons

A

Scientist: Ernest Rutherford

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4
Q

Gold foil experiment

A

Ernest Rutherford

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5
Q

Electric current in gas discharge tubes

A

JJ Thomson

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6
Q

Make hydrogen gas glow by passing an electric current through it

A

Niels Bohr

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7
Q

Planetary Model

A

Niels Bohr

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8
Q

Ice disappears in a drink

A

Melting, Absorbed (endothermic)

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9
Q

Frost forms on your lawn

A

Deposition, Released (Exothermic)

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10
Q

Snow melts without a trace

A

Sublimation, Absorbed (ENDO)

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11
Q

Raining

A

Condensation, released (Exothermic)

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12
Q

Snowing

A

Deposition, released (exothermic)

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13
Q

Car windows fog up

A

Condensation, released (Exothermic)

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14
Q

What happens to the temp during a change of state?

A

It remains constant

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15
Q

Describe what happens to the particles as heat is added?

A

Particles move faster and farther apart

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16
Q

What are the 4 points of kinetic molecular theory (kmt)?

A

-All matter is made up of very small particles
-There is empty space between the particles
-The particles are constantly moving
-Energy makes the particles move

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17
Q

Fill in the blanks:
Solid:
Shape:
Volume:
Space between particles:
Movement of particles:

A

Volume: Fixed
Shape: Fixed
Space between particles: Tightly packed together
Movement of particles: Vibrate

18
Q

Fill in the blanks:
Liquid:
Shape:
Volume:
Space between particles:
Movement of particles:

A

Shape: Not fixed
Volume: Fixed
Space between particles: Farther apart and a little bit more room than solid
Movement of particles: Slip and slide past each other

19
Q

Fill in the blanks:
Gas:
Shape:
Volume:
Space between particles:
Movement of particles:

A

Shape: Not fixed
Volume: Not fixed
Space between particles: Very far apart, there are large spaces between particles
Movement of particles: Move quickly and freely

20
Q

Salt dissolves in water

A

Chemical

21
Q

Cooking a hotdog

A

Chemical, Absorbed (Endo)

22
Q

Precipitate forms

A

Chemical

22
Q

Dew evaporates off of grass

A

Physical, Absorbed (ENDO)

22
Q

Candle burning (anytime anything burns its chemical change)

A

Chemical, Released (EXO)

22
Q

Condensation forms on a mirror

A

Chemical, Released (EXO)

23
Q

Pure substance

A

Made up of only one type of matter

23
Q

Element

A

Pure substance which cannot be broken down any further and is made up of only one type of atom

23
Q

Compound

A

Pure substance which is made up of two or more different types of elements

23
Q

Precipitate

A

Solid forms in a liquid

24
Q

Exothermic

A

A chemical or physical change which releases energy/heat

25
Q

Endothermic

A

A chemical or physical change which absorbs energy/heat

26
Q

What subatomic particle has a positive charge

A

Protons

27
Q

What subatomic particle determines the size of the atom

A

electrons

28
Q

Two particles that are almost equal in mass

A

Protons and Neutrons

29
Q

Has a negative charge

A

Electrons

30
Q

Found in the nucleus

A

Protons and Neutrons

31
Q

Contributes to the mass of the atom

A

Protons and Neutrons

32
Q

Has negligible mass

A

Electrons

33
Q

ALWAYS equal to the atomic number

A

Protons

34
Q

Two particles that exist in equal numbers in a neutral atom

A

Protons & Electrons

GRADE 9 FLASHCARDS (4 decks)

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