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Chemistry Module 2 (Barbara) > Moles > Flashcards

Flashcards in Moles Deck (29)
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1

1dm3 - cm3

X1000

2

1m3 - dm3

X1000

3

1cm3 - mm3

X1,000,000

4

1g - mg

X1000

5

1kg - g

X1000

6

1 tonne - kg

X1000

7

What is the definition of a mole?

The amount of substance that has the same number of particles as there are carbon atoms in exactly 12g of carbon 12.

8

What is the mass of one mole of a substance called?

Molar mass
(Same as atomic number)

9

What are the units of molar mass?

grams per mol

10

What are the 3 ways to find the moles?

mass/molar mass
volume/molar volume
concentration X volume

11

What is the molar volume?

24dm3 OR
24000cm3

12

What are the units of volume?

dm3

13

What are the units of concentration?

moldm-3

14

How do you work out the number of particles?

Moles X Avogadro's constant

15

What is Avogadro's constant?

6.02 X 10^23

16

How do you prepare a standard solution?

Place beaker on scales. Zero it.
Add 0.59g of salt into the beaker using spatular.
Add distilled water, stir with glass rod until salt has dissolved.
Add solution to volumetric flask using funnel.
Slowly add distilled water until bottom of meniscus is at 100cm3.
Put bung in and invert 15 times to mix.

17

What is the empirical formula?

Simplest ratio of atoms of each element present in a compound

18

How do you work out the empirical formula?

Work out number of moles of each element
Divide each by smallest one

19

What is the molecular formula?

Number and type of atoms of each element in a molecule.

20

How do you work out the number of water molecules in water of crystallisation calculations?

Moles of water/
Moles of anhydrous salt

21

What is the ideal gas equation

pV=nRT

22

What is pressure measured in the ideal gas equation?

Pascals
Pa

23

What is volume measured in the ideal gas equation?

m3

24

What is temperature measured in the ideal gas equation?

Kelvin
K

25

What does R stand for in the ideal gas equation?

Ideal gas equation

26

cm3-m3

X10^-6

27

dm3-m3

X10^-3

28

Degrees celsius - kelvin

+273

29

KPa-Pa

X1000