Quantitative Chemistry

Question 1

What is Mass?

Answer 1

Mass is how heavy something is (measured in grams).

Question 2

What is Volume?

Answer 2

Volume is how much space something takes up (usually in cm³ or dm³).

Question 3

Conservation of mass

Answer 3

The law of conservation of mass states that no atoms are lost or made during a chemical reaction so the mass of the products equals the mass of the reactants.

This means that chemical reactions can be represented by symbol equations which are balanced in terms of the numbers of atoms of each element involved on both sides of the equation.

Question 4

What is Mr?

Answer 4

⚖️ Mr stands for Relative Formula Mass.

It’s the total mass of all the atoms in a compound’s formula.

You find it by adding up the Ar (Relative Atomic Mass) of each element in the compound.

Question 5

when does mass increase?

Answer 5

Mass increases when a metal reacts with oxygen from the air, forming a metal oxide.

Question 6

when does mass decrease?

Answer 6

mass decreases In thermal decomposition, gases like carbon dioxide escape into the air.