Calculations

Question 1

Define relative mass

Answer 1

mass of a substance compared to carbon

Question 2

Define mole

Answer 2

mass of a substance required to have 6 * 10²³ particles

Question 3

Grab a notebook. Calculate the moles present in 50g of coppersulfate.

Answer 3

1 mol CuSO₄ ——– 160
0.313 mol ——- 50

Question 4

Grab a notebook. Calculate the moles present in 23.9g of ammoniumsulfide.

Answer 4

1 mol NH₃SO₃ ——– 68
0.351 mol ——– 23.9

Question 5

Grab a notebook. Calculate the mass of 2.8 moles of lithiumchloride.

Answer 5

1 mol LiCl ———- 42.5
2.8 mol ———- 119

Question 6

Grab a notebook. Calculate the mass of 1.5 * 10⁻⁴ moles of titanium(IV)nitrate.

Answer 6

1 mol Ti(NO₃)₄ —— 296
1.5 * 10⁻⁴ —– 0.0444

Question 7

Discrete covalents are molecules made of…

Answer 7

atoms

Question 8

Grab a notebook. Calculate the number of fundemental particles in 12.2g of Argon.

Answer 8

1 mol Ar = 40g = 6 * 10²³
0.305 mol = 12.2g = 1.83 * 10²³

Question 9

Grab a notebook. Calculate the number of fundemental particles in 6.75 g of potassiumoxide.

Answer 9

1 mol K₂O = 94g = 6 * 10²³
0.07 mol = 6.75g = 1.29 * 10²³

Question 10

Grab a notebook. Calculate the number of fundemental particles in 9.9g of chlorinepentaiodide.

Answer 10

1 mol ClI = 162.5g = 6 * 10²³
0.06 mol = 9.9g = 1.02 * 10²¹

Question 11

Grab a notebook. Calculate the number of fundemental particles in 21.5g of irridium(III)sulfide.

Answer 11

1 mol Ir₂S₃ = 480g = 6 * 10²³
0.045 mol = 21.5g =

Question 12

Define empirical formula

Answer 12

chemical formula calculated from an experiment, expressed as the lowest ratio of elements

Question 13

Grab a notebook. Figure out the empirical formula of Calcium Chloride

Answer 13

Question 14

Calculate the empirical of Aluminium and Oxygen

Answer 14

Question 15

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Question 16

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Question 17

Answer 17

Question 18

What do we need to know to be able convert from empirical formula to molecular formula?

Answer 18

Mr (mass of 1 mole of the substance)

Question 19

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Question 20

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Question 21

Answer 21

Question 22

Define ionic structure

Answer 22

lattice of anions and cations in an alternating pattern, held together by electrostatic forces

Question 23

What do the large spaces between particles have?

Answer 23

small molecules like water

Question 24

What do the sizes of spaces between particles depend on?

Answer 24

the ratio of the ionic radius

Question 25

When copper sulphate becomes anhydrous, what color does it turn? From what color?

Answer 25

from blue to white

Question 26

Which changes and which stays the same for hydrated and anhydrous salts? Mr and chemical properties

Answer 26

Chemical properties stays the same. Mr changes

Question 27

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Question 28

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Question 29

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Question 30

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Question 31

What does the volume of a gas depend on?

Answer 31

1. number of moles
2. temperature (proportional)
3. pressure (inversly proportional)

Question 32

Define volume

Answer 32

average space between particles

Question 33

Any gas with the same number of particles occupies the same/different space/s

Answer 33

the same

Question 34

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Question 35

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Question 36

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Question 37

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Question 38

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Question 39

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Question 40

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Question 41

How is the limiting reagent calculated?

Answer 41

1. Calculate the moles of both reagents
2. Identify the limiting reagent
3. Use the limiting reagent to calculate the moles of the required chemical
4. Calculate the mass of the required chemical

Question 42

Answer 42

Question 43

Answer 43

Question 44

Answer 44

I don’t have an answer yet 😁😁

Question 45

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Question 46

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Question 47

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Question 48

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Question 49

Answer 49