Amount of substance and the mole - 3.1 (1)

Question 1

How are chemicals usually measured?

Answer 1

by mass or volume

Question 2

As reactions take place on an atomic scale, what do chemists need?

Answer 2

a method for converting a measured mass or volume into the actual number of particles involved in the reactions

Question 3

What is the name of the quantity that chemists use?

Answer 3

amount of substance n -> to count the number of particles in a substance

Question 4

What is the name of the quantity that chemists use?

Answer 4

amount of substance n -> to count the number of particles in a substances

Question 5

What is the name of the unit used for the amount of substance?

Answer 5

mole (mol)

Question 6

What is one mole the amount of?

Answer 6

a substance that contains 6.02 x 10^23 particles

Question 7

What is Avogadro’s constant NvA?

Answer 7

6.02 X 10^23mol^-1 -> the number of particles in each mole of carbon-12

Question 8

What is 6.03 x 10^23 particles per mole directly linked to?

Answer 8

the mass of carbon-12, the standard for the measurement of relative atomic masses

Question 9

What does 12g of carbon-12 contain?

Answer 9

6.02 x 10^23 atoms

Question 10

What can you find the mass of one mole (1 mol) of?

Answer 10

atoms of any element - it is the relative atomic mass in grams

Question 11

One mole of carbon, C, atoms has a mass of?

Answer 11

12.0g

Question 12

One mole of hydrogen, H, atoms has a mass of?

Answer 12

1.0g

Question 13

One mole of magnesium, Mg, atoms has a mass of?

Answer 13

24.3g

Question 14

One mole of iron, Fe, atoms has a mass of?

Answer 14

55.8g

Question 15

What do you need to find the number of atoms?

Answer 15

the sample of an element and its mass

Question 16

What is difficult for us to understand the size of?

Answer 16

very large numbers

Question 17

If 6.02 x 10^23 (1 mol) pennies were shared evenly between all humans on earth, every person could spend how much per hour for their whole life?

Answer 17

£1m every hour

Question 18

What can the amount of substance and moles refer to?

Answer 18

they can refer to anything, not just atoms

Question 19

When you work in moles, what is it important to use?

Answer 19

the formula or unambiguous name of a substance for clarity

Question 20

1 mol of H: 1 mol of what kind element?

Answer 20

hydrogen atoms

Question 21

1 mol of Hv2: 1 mol of what kind of element’s molecules?

Answer 21

hydrogen molecules

Question 22

What is the mass of 1 mol of atoms of an element equal to?

Answer 22

the relative atomic mass in grams