Concervation Of Mass

Question 1

What is Relative Atomic Mass

Answer 1

(Mass of one atom)
(Ar) : relative atomic mass

We find this on the periodic table (biggest number/mass number)

Question 2

What is Relative Formula Mass

Answer 2

The mass of two or more atoms added together
To calculate this we add the Ar of each atom present, together

(Mr) : formula mass

Question 3

Calculate the RFM of N^2

14
N
7

Answer 3

(14 + 14)

=28

Question 4

Calculate the relative formula mass of H^2O^2

1 16
H O
1 8

Answer 4

1. 1. 16. 16
          H. +. H. +. O. +. O
2. 1. 8. 8

(1+1+16+16)
=34

Question 5

What is the law of conservation of mass

Total mass
Reactants
Products

Answer 5

The total mass of the reactants is the same as the total mass of the products

Question 6

No atoms created nor __________1.

We can see this in a _________2. Symbol equation as there are ___________3. Number and type of atom on each side of the equation.

The total mass of the _________4. Is _________5. As the total mass of the products.

Answer 6

1. destroyed
2. balanced
3. the same
4. reactants
5. the same

Question 7

Describe what is a closed system

Explain what a closed system means

Answer 7

Reaction vessel is sealed

You can’t gain or loose mass

Question 8

Describe what is an open system

Explain what an open system is

Answer 8

Reaction vessel is open
Reaction is free to the atmosphere
You can gain or loose mass

Question 9

Reactants. Products
2Mg + O^2. ——>2MgO

2x24. 2x16. (2x24)+(2x16)
=48. =32. =80
|____________|. |_______________|
=80. =80

What does this diagram show

Answer 9

Reactants. Products
2Mg + O^2. ——>2MgO

2x24. 2x16. (2x24)+(2x16)
=48. =32. =80
|____________|. |_______________|
=80. =80

The law of conservation of mass - the total mass of the reactants is the same as the total mass of the products