C5 Quantitative Chemistry

Question 1

Conservation of mass?

Answer 1

In a chemical reaction, atoms r not created 🔨 or destroyed just rearranged, total mass before =total mass after the reaction

Question 2

When a metal forms a metal oxide 🐂 y does the mass increase?

Answer 2

Because atoms from the gaseous oxygen has been added

Question 3

When an acid reacts with a metal 🤘 y does the mass decrease?

Answer 3

A gas is produced and escapes

Question 4

Relative formula mass?

Answer 4

The sum of the relative atomic masses of each atom in a substance

Question 5

What r the four state symbols and what do they stand for ?

Answer 5

(s) = solid 🧱🗿
(l) = liquid 🥤🧃
(g)= gas 😤 🔋
(aq) = aqueous or dissolved in water 🌊 🚿

Question 6

How can u tell when a symbol equation is balanced?

Answer 6

The number of atoms of each element is the same on both sides

Question 7

Mole?

Answer 7

Mass of a substance that contains 6.02x10^23 particles

Question 8

Give the value for the Avogadro constant

Answer 8

6.02x10^23

Question 9

Which formula is used to calculate the number of moles from mass and Mr?

Answer 9

Moles=mass divided by Mr

Question 10

Which formula is used to calculate 📏 the mass of a substance from number of moles and Mr?

Answer 10

Mass=molesxMr

Question 11

Limiting 🚫 reactant?

Answer 11

The reactant which is completely used up in a chemical reaction

Question 12

Unit for concentration?

Answer 12

g/dm(cubed)

Question 13

Which formula is used to calculate 📏 concentration from mass and volume 🔊?

Answer 13

Concentration(g/dm(cubed))= mass(g) divided by volume (dm(cubed))

Question 14

How can u convert a volume reading in cm(cubed) to dm(cubed)?

Answer 14

Divide by 1000

Question 15

If the amount of solute in a solution in a solution is increased, what happens to its concentration?

Answer 15

Increases

Question 16

If the volume of water in a solution is increased, what happens to its concentration?

Answer 16

Decreases