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chemistry Flashcards

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1
Q

What is the Atomic number

A

Number of protons in nucleus

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2
Q

What is the Mass number?

A

The sum of a number of protons and neutrons present in the nucleus of an atom

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3
Q

How to find the electron?

A

Same as Protons

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4
Q

HOW TO FIND THE NEUTRON?

A

Subtract the atomic number from the mass number

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5
Q

HOW TO FIND THE MASS NUMBER

A

mass number = protons + neutrons.

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6
Q

How do Solid particles move?

A

They move tightly together and slow movement.

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7
Q

How do Liquid particles move?

A

close together and random movement.

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8
Q

How do Gas particles move

A

Very fast in all direction

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9
Q

Condensation

A

Gas to liquid

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10
Q

Sublimation

A

Solid to gas

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11
Q

Deposition

A

Gas to solid

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12
Q

Vaporization

A

Liquid to gas

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13
Q

Melting

A

Solid to liquid

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14
Q

Freezing

A

liquid to solid

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15
Q

Example: sugar dissolves into water, what is the solute?

A

sugar

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16
Q

Example: sugar dissolves into water, what is the Solvent?

A

water

17
Q

What does ‘concentration of a solution’ mean?

A

The concentration of a solution tells us how much solute is mixed with the solvent.

18
Q

How does a solution become saturated?

A

when no more solute will dissolve in the solvent

19
Q

What is an element?

A

A pure substance made of one type of atom

20
Q

What is a mixture?

A

A mixture is formed when two or more elements or compounds are present without being chemically bonded together

21
Q

What is a compound?

A

Made of two or more atoms of different elements, such as water (H2O) and methane (CH4).

22
Q

HOw does an atom stay stable?

A

the outer shell of valence electrons needs to be full

23
Q

How is an atom unstable

A

incomplete outer shell

24
Q

How do atoms fill their outer shells to become stable?

A

Reacting with other atoms!

25
Q

What is a ‘physical’ change?

A

‘Type’ of substance does not change

26
Q

What is a ‘chemical’ change?

A

A new substance is formed
E.g. magnesium + oxygen → magnesium oxide

chemistry (3 decks)

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