C1 Flashcards

1
Q

Soild

A

Can not be compressed
Regular arrangement
Strong intermolecular forces between particles
Vibrate
Close together

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2
Q

Liquids

A

Weak forces between particles
Close together
Move freely
Random arrangement
Cannot be compressed

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3
Q

Gas

A

Random arrangement
Far apart
No forces between particles
Move freely and quickly

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4
Q

Why do you scientists use models PPD

A

Problem solving
Prediction
Develop understanding

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5
Q

Limitations of the particle model

A

Two-dimensional
Don’t take account size of particles
Don’t include forces between particles

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6
Q

Proton

A

Relative mass 1
Relative charge +1
Nucleus

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7
Q

Neutron

A

Relative mass 1
Charge 0
Nucleus

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8
Q

Electron

A

Relative mass 0.0005
Relative charge -1
Electron shells

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9
Q

Atom size

A

Radius 1x10-10m
6.022x10 23 g Avogadro number

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10
Q

What did Dalton discover

A

The elements are made up of atoms

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11
Q

What did JJ Thompson discover

A

He discovered the electron. He also made the plum pudding model That showed that atoms of positives spheres with electrons scattered inside of it

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12
Q

What did Rutherford discover

A

By firing positive alpha particles at gold foil some were deflected and some bounced back. This showed that there was a positively charged nucleus with electrons orbiting it

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13
Q

What did Neil Bhor for discover

A

discovered that electrons are found in fixed energy levels or electron shells

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14
Q

What is the mass number

A

Protons+neutrons

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15
Q

What is the atomic number

A

Protons or electrons

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16
Q

What are isotopes

A

Isotopes of an element have the same number of protons and electrons but different number of neutrons

17
Q

What is oxidation

A

When a substance gains oxygen

18
Q

What is reduction

A

When is when oxygen is removed from a substance

19
Q

What is a physical change

A

A change in state for example one no new substances formed

20
Q

What is a chemical change?

A

when atoms form a new substance an element or a compound

21
Q

What is an ion

A

A charged particle

22
Q

What is the overal charge of the nucleus

A

Positive

23
Q

What is the overall charge of an atom

A

Neutral