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GCSE’s > Chemistry > Flashcards

Chemistry Flashcards

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1
Q

What is the equation for concentration (g/dm^3)

A

Conc = Mass(g)/volume(dm^3)

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2
Q

What is the equation for an Rf value in chromatography?

A

Rf = distance moved by substance/ distance moved by solvent

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3
Q

What is the equation for moles?

A

Moles = mass/Mr

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4
Q

What is the equation for the number of particles in a substance?

A

= moles x avagadros constant

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5
Q

What is the avagadros constant?

A

6.02x10^23

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6
Q

What is the equation for percentage yield?

A

% yeild = mass of product actually made/ maximum theoretical product possible made *100

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7
Q

What is the equation for atom economy?

A

= Mr of desired product/ Mr of all reactants *100

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8
Q

What is the equation for concentration using moles (mol/dm^3)?

A

Conc = moles / volume(dm^3)

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9
Q

What is the equation for the volume of gas at room temp?

A

Volume (dm^3) = moles*24

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10
Q

What are ions?

A

They are charged atoms

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11
Q

How are ions formed?

A

Ions are formed when atoms lose or gain electrons

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12
Q

What type of elements form ionic bonds?

A

A metal and a non metal

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13
Q

How are ionic bonds formed?

A

The metal atom transfers its outer shell electrons to the non metal

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14
Q

What are the properties of an ionic compound?

A
  • High boiling + melting points
  • Can conduct electricity when molten or dissolved
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15
Q

Why can’t ionic compounds conduct electricity when solid?

A

Because their ions are held in fixed positions and cannot move.

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16
Q

What type of elements form covalent bonds?

A

Two non-metals

17
Q

What bonds are formed between a metal and a non-metal?

A

Ionic bonds

18
Q

What bonds are formed between a non-metal and a non-metal?

A

Covalent bonds

19
Q

How is a covalent bond formed?

A

The non-metals share their electrons.

20
Q

What are the properties of simple covalent structures?

A
  • They don’t conduct electricity
  • They have low boiling + melting points
21
Q

Why do simple covalent structures have low melting + boiling points?

A

Because they have weak intermolecular forces between the molecules which means they need little amount of energy to break the bonds

22
Q

What are some examples of giant covalent structures?

A

Diamond, graphite, silicon dioxide and buckminsterfullerine

23
Q

What element does diamond consist of?

A

Carbon

GCSE’s (8 decks)

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