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Chemistry > Chem chapter 5 (Chemical Calculations) > Flashcards

Chem chapter 5 (Chemical Calculations) Flashcards

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1
Q

What is mole?

A

The term is used to talk about the mass. The mass of a mole of a substance is the mass of its relative atomic mass in grams.

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2
Q

What is the number for Avogadro’s constant

A

6.022 x 10^23

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3
Q

Symbol for Avogadros constant

A

NA

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4
Q

Formula for number of particles

A

Moles x Avogadro’s number

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5
Q

Formulas for mole

A

Mass/ Molar mass

Number of particles/ Avogadro’s number

Volume/Volume at RTP

Concentration * Volume

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6
Q

How many moles are there in 60g of sodium hydroxide

A

60/40= 1.5

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7
Q

What is the mass of 0.5 mol of hydrated copper sulfate crystals?

A

249.685x0.5= 124.75

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8
Q

What is the formula for percentage of atom in molecule

A

Relative atomic mass/ Relative formula mass X 100

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9
Q

Define Avogadro’s law

A

Equal volumes of gas are found to contain the same number of particles

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10
Q

How much space does one mole of any gas occupy

A

24dm³

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11
Q

How much is 24dm³

A

24 litres

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12
Q

What does S.T.P stand for

A

Standard temperature pressure

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13
Q

How much is the standard temperature pressure

A

0⁰C

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14
Q

What does R.T.P stand for

A

Room temperature pressure

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15
Q

Define the Law of conservation of mass?

A

The mass of products is equal to the total mass of the reactants.

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16
Q

Why are balanced equations useful?

A

The balanced equation for a chemical reaction shows the ratio of reactants and products involved

17
Q

Define percentage yield?

A

It shows how much product was actually made compared with the amount of product that was expected

18
Q

Define theoretical yield?

A

It is the maximum mass of product expected from the reaction, using reacting masses

19
Q

Define actual yield?

A

It is the mass of the product that is actually obtained from the real chemical reaction/experiment.

20
Q

What is the equation for the percentage yield?

A

Actual yield / Theoretical yield * 100

21
Q

Equation for percentage purity?

A

Mass of pure product / Mass of impure product * 100

22
Q

What does R.F.M stand for?

A

Relative formula mass

23
Q

What is R.A.M?

A

Relative Atomic mass

24
Q

What is the formula for percentage composition/percentage by mass of an element?

A

R.A.M * Number of atoms / R.F.M of compound * 100

25
Q

Define solution?

A

When a chemical substance (solute) is dissolved into a volume of solvent.

26
Q

What are the 2 ways of measuring the quantity of solute?

A

. By its mass (g) = Mass concentration
. By its amount (moles) = Molar concentration

27
Q

Define a standard solution?

A

A solution that has been carefully made up so that its concentration is known precisely

Chemistry (10 decks)

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