Stoichiometry and gas laws

Question 1

Standard solution

Answer 1

A solution of accurately known concentration

Question 2

End point

Answer 2

The point during a titration when the indicator changes colour

Question 3

Equivalence point

Answer 3

Occurs when the reactants have been mixed in the mole ratio shown by the reaction equation

Question 4

Concordant Titre

Answer 4

Titres that are within a range of 0.1 ml from highest to lowest

Question 5

Two types of titrations

Answer 5

Strong acid/weak base
Strong base/weak acid

Question 6

Natural greenhouse effect vs enhanced greenhouse effect

Answer 6

Natural greenhouse effect is a process that keeps the Earth’s surface warm and is crucial to life, whereas enhanced greenhouse effect increases surface warming beyond that which occurs naturally

Question 7

Pressure

Answer 7

Force per unit Area

Question 8

Standard laboratory conditions

Answer 8

Refers to a temperature of 25*C (298K) and a pressure of 100 kPa. tHE VALUE OF Vm at SLC is 24.8 L/mol

Question 9

Key features of an ideal gas

Answer 9

Particles of a gas are in a continuous chaotic motion, colliding with each other, exerting pressure
2)The collisions are perfectly elastic. They do not result in energy loss

3)There are no forces of attractions between molecules

4)The actual volume occupied by gas particles is negligible compared to volume of the container

5)Mean kinetic energy of particles is proportional to the absolute temperature of the gas

Question 10

Equation for Ideal gas

Answer 10

PV = nRT

Question 11

What is 0 degrees celsius in kelvin

Answer 11

273

Question 12

Ideal gast constant (R)

Answer 12

8.31

Question 13

Limiting reagent

Answer 13

the reactant that gets used completely in a chemical reaction and limits how much product can be formed.

Question 14

Main 3 Greenhouse gases

Answer 14

H20 (Water)
C02 (Carbon dioxide)
CH4 (Methane)

Question 15

Define Molarity

Answer 15

Moles of solute per litre of solution

Question 16

Hygroscopic

Answer 16

A substance that tends to absorb moisture from the air

Question 17

Deliquescent

Answer 17

Substances that become liquid by absorbing moisture from the air

Question 18

Percentage yield

Answer 18

Question 19

What chemical is both hygroscopic and deliquescent

Answer 19

Sodium Hydroxide

Question 20

Titration error

Answer 20

The difference between the end point and equivalence point

Question 21

100 kPa = ?mm Hg

Answer 21

100 kPa = 750 mm Hg

Question 22

5 features of a primary standard

Answer 22

1) It must be solid and have a high purity and soluble in the solvent used

2)It must have an accurately known formula

3)It must be stable, its composition or formula must not change over time

4)It must be cheap and readily available

5)It should have a relatively high molar mass so weighing errors are minimized.