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Abi Science 2017 > Quantitative Aspects Of Chemical Change > Flashcards

Quantitative Aspects Of Chemical Change Flashcards

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Biology 101 flashcards
1
Q

What is the mole?

A

A quantity of matter containing exactly the same number of elementary particles as there are carbon atoms in 12g of carbon- 12

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2
Q

What is Avogadro’s number?

A

The fixed number of particles within one mole of a substance

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3
Q

What is the value of Avogadro’s number?

A

6,02 x 10^23

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4
Q

What is molar mass?

A

The mass per mole of substance

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5
Q

What is relative formula mass?

A

The mass of one mole of a substance expressed in grams

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6
Q

What is the unit used to measure molar mass?

A

g.mol^-1

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7
Q

What is the formula used to determine the number of moles of a substance? (Using number of particles)

A

N
n= —
NA

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8
Q

What does n stand for?

A

Number of moles

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9
Q

What does N stand for?

A

Number of particles

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10
Q

What does NA stand for?

A

Avogadro’s number

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11
Q

What is the formula to determine the number of moles of a substance? (Using mass)

A

m
n= —
M

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12
Q

How can we determine M?

A

By using the values provided on the Periodic Table

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13
Q

What are stoichiometric calculations?

A

Calculations that are used to determine the masses and volume of reactants and products

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14
Q

What do balanced chemical equations give us?

A

The mole ratio in which substances react

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15
Q

What are the three steps that need to be followed when doing stoichiometric calculations?

A

Convert the given information into moles
Use the mole ratios of the equations to find the moles of the required substance
Convert the moles into the required information

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16
Q

What does the percentage composition of compounds tell us?

A

The percentage of the compound that a certain substance makes up

17
Q

What do you use to work out the percentage composition of a compound?

A

The chemical formula of the substance

The relative atomic mass of the various elements making up the substance

18
Q

How do you work out the percentage composition of a compound?

A

Molar mass of the compound
Divided by the total molar mass of the compound
Multiplied by 100

19
Q

What determines the concentration of a solution?

A

The amount of solute dissolved in the solution

20
Q

What symbols are used for concentration?

A

c

[substance]

21
Q

What unit of measurement is used for concentration?

A

mol.dm^-3

22
Q

What is the formula for the concentration of a substance?

A

n
c= —
V

23
Q

If we are not given the number of moles, what formula do we use for concentration?

A

n
c= —
VM

24
Q

How do you convert cm^3 to dm^3?

A

Divide by 1000

25
Q

How many cm^3 is 1ml equal to?

A

1

26
Q

How many dm ^3 is 1L equal to?

A

1

Abi Science 2017 (18 decks)

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