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GCSE Chemistry > Quantitative Chemistry > Flashcards

Quantitative Chemistry Flashcards

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1
Q

State what RAM stands for and give its definition.

A

Relative Atomic Mass

The relative atomic mass of an atom is the mass of the atom compared with the carbon 12 isotope, which has a mass of exactly 12, and it is the weighted mean mass of the mass numbers.

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2
Q

How can you quickly find the RAM?

A

-> 23
Na
11

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3
Q

State what RFM stands for and give its definition.

A

Relative Formula Mass

The sum of the relative atomic mass of all the atoms in a formula of a substance

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4
Q

How can you quickly find the RFM?

A

E.g

H2O = 1 + (16x2) = 33

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5
Q

What is the equation for % of an element in a compound:

A

Mass of element in compound
________________________________ x100
Total mass of compound

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6
Q

What is a mole?

A

The mole is an amount of a chemical

The relative formula of a substance in grams is known as one mole of that substance

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7
Q

How do you find one mole of a substance?

A

Step 1: MgO
Step 2: Mg O
Step 3: 24 + 16
Step 4: = 40g

Basically 1 mole is the RFM

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8
Q

What is the unit of moles

A

n

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9
Q

How do you find the moles of a substance from its mass?

A

Moles = mass/RAM

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10
Q

How do you find the mass of a substance from its moles?

A

Mass = moles x RAM

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11
Q

How many kilograms in a ton?

A

1000

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12
Q

How many grams in a ton?

A

1,000,000

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13
Q

How many grams in a kilogram

A

1000

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14
Q

How many milligrams in a gram?

A

1000

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15
Q

How many milligrams in a tonne?

A

1,000,000,000

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16
Q

Go practice calculating reacting masses

A

Ok

17
Q

Why is % yield not always 100%?

A

Loss by mechanical transfer
Loss when fizzing
Loss by filtration
Incorrect measurements
Side reactions
Reaction not complete

18
Q

Why is the crucible weighed multiple times when heating a crystal to calculate water of crystallisation?

A

Heat to constant mass to ensure all the water had been removed

GCSE Chemistry (21 decks)

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