Quantitative

Question 1

Define Mol?

Answer 1

A unit of measure for atoms. What is its value?

Question 2

Molar Mass?

Answer 2

The mass in grams of one mole of that substance. Symbol: M. / S.I. Unit: g.mol-¹

Question 3

Relative Molecular Mass?

Answer 3

The number of times that the average mass of a molecule of a compound is greater than 1/12th of a carbon atom. Symbol: Mr. Calculated by adding relative atomic masses of atoms in molecules.

Question 4

Empirical Formula?

Answer 4

Shows the simplest ratio of the elements in the compound.

Question 5

Molecular Formula?

Answer 5

Shows the actual number of atoms of each element in one molecule of the compound.

Question 6

Solution?

Answer 6

A homogenous mixture of solute and solvent.

Question 7

Solute?

Answer 7

The substance that is dissolved in the solution.

Question 8

Solvent?

Answer 8

The substance in which another substance is dissolved, forming a solution.

Question 9

Concentration?

Answer 9

The amount of solute per unit volume of solution. Unit: mol.dm-³ and volume must be in dm³ when doing calculations.

Question 10

Standard Solution?

Answer 10

A solution of exactly known concentration.

Question 11

Dilution?

Answer 11

A less concentrated solution made from a more concentrated one.

Question 12

Molar Gas Volume?

Answer 12

The volume of 1 mol of gas. Unit : dm³.mol-¹ MGV depends on (1) temperature: direct proportionality and (2) pressure: inverse proportionality.

Question 13

What does STP stand for and what are the values?

Answer 13

Standard Temperature and Pressure. At STP Temperature is 273K (0⁰ C). Pressure is 1.013 x 10⁵ Pa. Volume is 22.4 dm³.

Question 14

Boyle’s Law?

Answer 14

The pressure of a fixed amount of gas is inversely proportional to its volume at constant temperature.

Question 15

Investigation Question?

Answer 15

Ask how one quantity changes when another quantity is changed. Must be a question and no numbers.

Question 16

Hypothesis?

Answer 16

A statement proposing a possible answer to the investigative question. Similarly, no numbers, not even the words double or half.

Question 17

Conclusion?

Answer 17

The focus of the conclusion is to address the investigation question by answering it and mentioning any deductions drawn from the graphs, calculations and other observations.

Question 18

Define the Independent variable and what axis is it plotted on?

Answer 18

The one you chose to set at specific values. It is always plotted on the horizontal axis.

Question 19

Dependent variable?

Answer 19

The one you measure as a result.

Question 20

Pressure?

Answer 20

The force per unit area exerted on a surface by gas particles colliding with the surface.

Question 21

Temperature?

Answer 21

The average kinetic energy of particles in a space. Energy distribution curves are important when analyzing how many particles have very low to very high kinetic energy. There is never a case where a particle has zero energy.

Question 22

Avogadro’s Principle?

Answer 22

Equal volumes of all gases at the same temperature and pressure contain the same number of molecules regardless of the size of the molecules. This means that a 1dm³ bottle will always contain the same number of any kind of gas molecules or even mixture of gas molecules. No matter how big each molecule is, as long as the temperature and pressure is constant.

Question 23

Yeild?

Answer 23

A measure of the extent of a reaction, generally measured by comparing the amount of product against the amount of product that is possible.

Question 24

Theoretical Yield?

Answer 24

The maximum amount which should’ve or could’ve been formed from the given reagents.

Question 25

Limiting Reagent?

Answer 25

The reagent that is completely used up in a chemical reaction.

Question 26

Excess?

Answer 26

A reagent which is in excess and has some moles left over when the reaction is finished.

Question 27

Titration?

Answer 27

A process for determining the volume of one solution required to exactly react with another solution. Titration is a very accurate experimental procedure, don’t lose accuracy by rounding off in intermediate calculations. Answers are in 3 decimal places.

Question 28

List the Titration Apparatus?

Answer 28

Pipette, Burette, Conical flask, Acid base indicator and a white slab or paper.