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Chemistry > Topic 3 > Flashcards

Topic 3 Flashcards

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1
Q

How to calculate relative formula mass (Mr)?

A

Add all the relative atomic masses (Ar) together.

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2
Q

How to calculate the percentage mass of an element in a compound?

A

Ar * number of atoms of that element / Mr of the compound * 100

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3
Q

What is a mole and how much is one mole?

A

An amount of a substance. One mole = Ar of the element)

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4
Q

What is the Avogadro constant?

A

6.02 * 10^23

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5
Q

How to calculate the number of moles?

A

Mass (g) / Mr

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6
Q

What’s a limiting reactant?

A

The reactant that’s used up in a reaction.

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7
Q

How to calculate volume of gas?

A

Mass of gas / Mr of gas * 24

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8
Q

Definition of concentration?

A

The amount of a substance in a certain volume of a solution.

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9
Q

What are the 2 equations for concentration?

A

Mass of solute / volume of solvent
OR
Number of moles of solute / volume of solvent

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10
Q

What are titrations?

A

Experiments that let you find the volume of 2 solutions that are needed to react together completely.

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11
Q

Equation to transfer mol/dm^3 to g/dm^3?

A

Mass = moles * Mr

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12
Q

What is atom economy?

A

Percentage of reactants forming useful products.

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13
Q

How to calculate atom economy?

A

Relative formula mass (Mr) of desired product / relative formula mass (Mr) of all reactants * 100

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14
Q

What does 100% atom economy mean?

A

All atoms in the reactants are desired products.

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15
Q

Positives of 100% atom economy?

A

Less waste
More profitable

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16
Q

Equation for percentage yield?

A

Mass of product actually made / maximum theoretical mass of product * 100

17
Q

What percentage atom economy do all reactants with one product only have?

A

100%

18
Q

What are 3 reasons why it’s impossible to have 100% percentage yield?

A
  1. Not all reactants react to make products.
  2. There might be side reactions (mix with gas in the air).
  3. You lose some product when you separate it from the reaction mixture.

Chemistry (3 decks)

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