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Chemistry Grade 11 > Exam Review > Flashcards

Flashcards in Exam Review Deck (30):
1

How many sigfigs are in 2.5002 g?

5

2

How many sigfigs are in 0.00650?

3

3

How many sigfigs are in 5001g?

4

4

How many sigfigs are in 0.00200300 mol?

6

5

How do you round sig figs when multiplying?

Round to the value with the lowest number of sig figs

6

How do you round sigfigs when adding or subtracting?

Lowest number of decimal sig figs

7

Define sublime

change directly into vapor when heated, typically forming a solid deposit again on cooling.

8

Define triple point

the temperature and pressure at which the solid, liquid, and vapor phases of a pure substance can coexist in equilibrium.

9

Define sublimate

a solid deposit of a substance that has sublimed.

Another term for sublime

10

Increasing the volume of a given amount of gas at a constant temperature causes the pressure to ? Because ?

Decrease, the molecules are striking a larger area with the same force

11

As the temperature of a fixed volume of gas increases, the pressure of the gas will ? In a ? Relationship.

Increase, directly proportional

12

The volume of a gas is reduced from 4 litres to 0.5 litres while the temperature is held constant. The new pressure of the gas

A. Decreases to 1/4 its original value
B. Is reduced by 1/2
C. Is increased 8x
D. Remains unchanged

C. Is increased 8x

13

Which of the following changes would NOT cause an increase in the pressure of a gaseous system?

A. The container is made larger
B. Additional amounts of the same gas are added to the container
C. The temperature is increased
D. All of the above

A. The container is made larger

14

Explain how a water molecules structure is allowed to dissolve in ionic compounds

-shared a pair of electrons between hydrogen and oxygen atoms pulled closer to the oxygen atom due to higher electronegativity, causing the O atom to be slightly more negatively charged than the H atoms. This allows the molecule to attract to the + and - ions of a Crystal and solvated it

15

When a solid solute is able to dissolve into a liquid solvent, its considered ?

Soluble

16

When a solid solute is unable to dissolve into a liquid solvent, it is considered ?

Insoluble

17

Explain how temperature and pressure affect the solubility of:solids in solution

increased temp. = increased KE = Increased solubility

Increased pressure = no charge

18

Explain how temperature and pressure affect the solubility of: gases in solution

Increased temp = decreased solubility

Increased pressure = increased solubility

19

Define saturated

No more solute can dissolve. Rate of dissolving= rate of recrystalizing

20

Define unsaturated

More solute can dissolve in solvent. Rate of dissolving > rate of recrystalizing

21

Define supersaturated

More solute than can normally be found specific volume of solvent at set temperature

22

Define the boiling point of water and explain how it changes as a result of adding a solute.

B.P: when vapour pressure equals atm. Pressure

Adding a solute decreases vapour pressure (solute particles take us space @ surface) B.P. Increases b/c you need to add more heat to bring the vapour pressure up to meet atm pressure

23

Define the freezing point of water and explain why and how it changes as a result of adding a solute

F.P: when liquid changes to solid

Adding a solute gets in the way of crystal formation causing the F.P. To decrease

24

Name the first 10 alkanes

Methane, ethane, propane, butane, pentane, hexane, heptane, octane, nonane, decane

25

What is the formula for percent composition?

% by mass of element = mass of element/mass of compound x 100%

26

If you know the chemical formula of a compound how can percent composition be calculated(formula)?

%by mass of element= mass of element in 1 mol compound/ molar mass of compound x 100%

27

Define kinetic energy

The energy an object has because of its ratio

28

Define vacuum

A space where no particles of matter exist

29

Define specific heat capacity

The quantity of a substance required to raise the temperature of 1 gram of substance by 1 degree Celsius

30

What’s the formula for molarity(concentration)

Molarity= moles of solute/ litres of solution