# Amount of substance and the mole - 3.1 (1) Flashcards Preview

## OCR (A) A Level Chemistry - Module 2 - Chapter 3 > Amount of substance and the mole - 3.1 (1) > Flashcards

Flashcards in Amount of substance and the mole - 3.1 (1) Deck (22)
1
Q

How are chemicals usually measured?

A

by mass or volume

2
Q

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

A

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

3
Q

What is the name of the quantity that chemists use?

A

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

4
Q

What is the name of the quantity that chemists use?

A

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

5
Q

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

A

mole (mol)

6
Q

What is one mole the amount of?

A

a substance that contains 6.02 x 10^23 particles

7
Q

A

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

8
Q

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

A

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

9
Q

What does 12g of carbon-12 contain?

A

6.02 x 10^23 atoms

10
Q

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

A

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

11
Q

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

A

12.0g

12
Q

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

A

1.0g

13
Q

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

A

24.3g

14
Q

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

A

55.8g

15
Q

What do you need to find the number of atoms?

A

the sample of an element and its mass

16
Q

What is difficult for us to understand the size of?

A

very large numbers

17
Q

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?

A

£1m every hour

18
Q

What can the amount of substance and moles refer to?

A

they can refer to anything, not just atoms

19
Q

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

A

the formula or unambiguous name of a substance for clarity

20
Q

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

A

hydrogen atoms

21
Q

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

A

hydrogen molecules

22
Q

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

A

the relative atomic mass in grams