Relative formula mass and conversation of mass

Question 1

A(small r on A s foot)

Answer 1

Atomic mass

Question 2

M( small r on M s foot)

Answer 2

Molecular mass/ relative formula mass

Question 3

Isotope

Answer 3

has a different number of neutrons but the same number of protons and electrons.

Question 4

A(small r on A s foot) what it tells us

Answer 4

It tells us the mass of an atom compared to 1 atom of carbon

Question 5

relative formula mass is mass…

Answer 5

of elements in a compound

Question 6

Chemical reaction

Answer 6

A chemical reaction is a change that takes place when one of or more substances( called reactants) form one or more new substances( called products)

Question 7

What might happen observing a chemical reaction

Answer 7

a colour change
change of states
Energy being transferred
An odour being produced

Question 8

What happens in a chemical reaction?

Answer 8

Bonds break
Bonds are created
Substances are formed

Question 9

Experimenting proving of existence of conversation of mass

Answer 9

1) mass of measuring cylinder and 10 cm cubed of reactant 1
2) Mass of of measuring cylinder and 10cm cubed of reactant 2
3) Reactant mass= mass of both measuring cylinders and reactants
4) Product mass= mass of measuring cylinders + products and the emptied measuring cylinders

Question 10

What to write in the conclusion of the experiment of the existence of conversation of mass

Answer 10

1) Write down your observation- what colour are your reactants and products?
2) Compare the reactant mass with product mass… what do you notice?

Question 11

Law of conversation of mass

Answer 11

Matter cannot be created neither destroyed, it can only be transferred