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GCSE CHEMISTRY > C1 ATOMIC STRUCTURE > Flashcards

C1 ATOMIC STRUCTURE Flashcards

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1
Q

What are ALL substances made from?

A

ALL substances are made from ATOMS

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2
Q

What represents atoms of each element? And give 3 examples

A

Chemical Symbols. Na - Sodium, O - Oxygen, Cl - chlorine

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3
Q

How are compounds formed?

A

Formed from elements by chemical reactions

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4
Q

Describe what happens in chemical reactions

A

One or more new substances are formed and often there is a detectable energy change.

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5
Q

Describe compounds

A

Compounds contain two or more elements chemically combined in fixed proportions.

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6
Q

How can compounds be seperated

A

They can only be separated into elements by chemical reactions.

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7
Q

How do you represent Chemical Reactions

A

They can be represented by word equations or using symbols and formulae.

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8
Q

Name a compound of sodium when combined with chlorine and give the symbol

A

Sodium chloride, NaCl

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9
Q

Define a half equation

A

Half equations show one half of a Redox reaction

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10
Q

Tips for writing half equations

A
  1. Pick out the products and reactants
  2. Balance the elements
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11
Q

Describe a mixture

A

A mixture consists of two or more elements or compounds NOT chemically combined together

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12
Q

What happens to the chemical properties in a mixture

A

They are unchanged

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13
Q

Name the physical processes that can separate mixtures.

A

They are: Filtration, Crystallisation, Simple Distillation, Fractional Distillation and Chromatography

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14
Q

What happens during the separation techniques for mixtures

A

No chemical reactions occur and no new substances are made.

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15
Q

Give names of scientists who helped with the development of the model if the atom

A

John Dalton - 1800s
J.J Thomson - 1890s
Ernest Rutherford - 1910s
Niels Bohr - 1910s
James Chadwick - 1940s

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16
Q

What happened before the discovery of the electron

A

Before the discovery of electrons atoms where thought to be tiny spheres that could not be divided

17
Q

What did the discovery of the electron lead to

A

The discovery of the electron led to the plum pudding model of the atom

18
Q

What did the plum pudding model suggest

A

The plum pudding model suggested the atom is a ball if positive charge with electrons embedded in it

GCSE CHEMISTRY (1 decks)

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