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Chemistry > Year 9 > Flashcards

Year 9 Flashcards

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1
Q

Protons, neutrons and electrons relative mass

A

P: 1, n:1, e: 0

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2
Q

Relative charge of protons neutrons and electrons

A

P: positive 1, n: 0, e: negative 1

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3
Q

What did dalton do (history of periodic table)

A

Ordered elements by mass

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4
Q

What did newlands do?

A

Put the elements in periods of 8

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5
Q

What did Mendeleev do?

A

He left gaps for undiscovered elements

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6
Q

What did Moseley do?

A

He ordered them by atomic number

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7
Q

Jj Thomson

A

Plum funding model

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8
Q

Rutherford model

A

Nuclear model

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9
Q

Niels Bohr

A

Energy level model

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10
Q

James Chadwick’s model

A

Neutrons

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11
Q

Alkali metals

A

Elements in group 1

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12
Q

Group 7 is also known as…

A

Halogens

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13
Q

Noble gases

A

Is group 0

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14
Q

Displacement reaction

A

More reactive element takes the place of a less reactive compound

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15
Q

Transition metals

A

Elements from the central block of the periodic table

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16
Q

Compound

A

2 or more elements chemically bonded together

17
Q

Atom

A

The smallest particle of an element

18
Q

Molecule

A

2 or more atoms chemically bonded together

19
Q

Element

A

A substance made up of only 1 type of atom

20
Q

Mixture

A

2 or more substances mixed together but not bonded and don’t react

21
Q

Isotope

A

Atoms of the same element but with different numbers of neutrons

22
Q

The 5 separation techniques

A
  1. Filtration: Using a filter to separate an insoluble solid from a liquid.
  2. Crystallisation: The liquid (solvent) evaporates away leaving the soluble solid crystals (solute) behind.
  3. Simple distillation: Separates a liquid from a solution. The solution is heated, it evaporates and then condenses for collection.
  4. Fractional distillation: Separates multiple liquids from a solution, based on boiling points.
  5. Chromatography: separating soluble substances from one another.
23
Q

Where r protons and nuetrons found

A

In the nucleus

24
Q

What did Niels Bohr discover

A

Energy shells and the electrons orbit in fixed distances from the nucleus

25
Q

What did James Chadwick discover

A

Neutrons

26
Q

How can you find out the number of protons in an atom

A

Atomic number

27
Q

What is the relative charge of each subatomic particle

A

P: +1 n:0 e:-1

28
Q

Why do atoms have no overall charge

A

Because they cancel eachother out

Chemistry (3 decks)

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