c3 - quantitative chemistry

Question 1

what is conservation of mass

Answer 1

no atoms are lost or made during a chemical reaction

so the mass of the reactants = The mass of the
products

Question 2

what is in 1 mole?

Answer 2

6.022 × 10^23

Question 3

equation that links moles mass and Mr

Answer 3

mass = moles x Mr

Question 4

what is limiting reactant?

Answer 4

In an experiment we usually add excess of a reactant so that
everything fully reacts.

The reactant that will fully get used up is called the limiting reactant!

Question 5

what is meant by concentration?

Answer 5

Concentration tells us the mass of a solute in a given volume
of solution.

Solute: A chemical that is dissolved in a solvent

In chemistry, water is often used as a solvent

Question 6

What are the units of concentration?

Answer 6

One unit of concentration is g/dm^3

Question 7

what is the equation that links mass concentration and volume

Answer 7

mass = concentration x volume

Question 8

What will happen to the concentration if
INCREASE the mass of
solute

Keep the volume the
SAME

Answer 8

concentration increases

Question 9

What will happen to the concentration if
Keep the mass of solute
the SAME

INCREASE the volume
the same

Answer 9

concentration decreases