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OCR Chemistry A level > Chapter 3- Amount of substances > Flashcards

Chapter 3- Amount of substances Flashcards

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1
Q

Define ‘Mole’

A

6.02x10^23 particles

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2
Q

Why is a mole 6.02x10^23 particles?

A

12g of carbon 12 contains 6.02x10^23 atoms.

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3
Q

What does one mole of Uranium atoms weigh?

A

238.1g

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4
Q

What is the equation for working out number of moles?

A

number of moles= mass (g)/ Mr

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5
Q

Calculate the number of moles present in 4.6g of Germanium.

A

0.0633608815g

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6
Q

Calculate the mass of 8.4moles of

copper arsenide, Cu3As in kilograms.

A

3.935232Kg

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7
Q

What is the empirical formulae?

A

The simplest whole number ratio of atoms of each element in a compound

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8
Q

Calculate the empirical formulae of C4H10

A

C2H5

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9
Q

In an experiment , 1.303g of Calcium Combines with 2.23g of chlorine to form a compound. Calculate the empirical formula.

A

CaCl2

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10
Q

What does it mean when a salt is hydrated?

A

Water is part of their crystalline structure

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11
Q

What 2 assumptions must you make when using experimental data to calculate the amount of water in a hydrated salt?

A

All the water has been lost

There is no further decomposition

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12
Q

What is the formula to calculate concentration from the number of moles?

A

Volume (dm3)/ number of moles

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13
Q

What value is the molar gas volume at RTP?

A

24sm3mol-1

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14
Q

How do you calculate number of moles of a gas?

A

Volume (dm3)/ 24

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15
Q

State the ideal gas equation.

A

p(Pa)V(m3)=nR(8.314Jmol-1)T(K)

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16
Q

Calculate the pressure of 105cm3 of 0.2moles of gas at 260K.

A

4117409.52KPa

17
Q

Convert 50C into K.

A

313K

18
Q

What is the stoichiometry of an equation?

A

The ratio of the amount, in moles, of each substance

19
Q

What is the formula to calculate % yield?

A

(actual yield/theoretical yield)*100

20
Q

1.15g of Sodium reacts with excess chlorine, forming 1.872g of Sodium Chloride. What is the % yield for this reaction?

A

64%

21
Q

What is the formula for atom economy?

A

(Mr of desired products/Mr of all products*100

22
Q

How could you increase the atom economy for a reaction

A

find a use for the unwanted products

OCR Chemistry A level (28 decks)

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