Comprehensive Lab Final

Question 1

Describe FXN and know what it looks like:
Beaker

Answer 1

SMH liquids, cylindrical

SMH = store, mix, heat

Question 2

Describe FXN and know what it looks like:
Erlenmeyer Flask

Answer 2

SMH liquids, conical

SMH = store, mix, heat

Question 3

Describe FXN and know what it looks like:
Clay Triangle

Answer 3

Support crucible when heating substances via BB

Question 4

Describe FXN and know what it looks like:
Crucible w/ Lid

Answer 4

Heat solids @ high temp

Question 5

Describe FXN and know what it looks like:
Evaporating Dish

Answer 5

Evaporation of liquids

Question 6

Describe FXN and know what it looks like:
Forceps

Answer 6

Grasp/hold objects

Question 7

Describe FXN and know what it looks like:
Funnel

Answer 7

Channel liquids/fine-grain substances into containers w small opening

Question 8

Describe FXN and know what it looks like:
Glass Rod

Answer 8

Mix chemicals/liquids

Question 9

Describe FXN and know what it looks like:
Graduated Cylinder

Answer 9

• Measure vol of liquids
  (More accurate/precise than flasks/beakers)

Question 10

Describe FXN and know what it looks like:
Litmus Paper

Answer 10

• Acid-base indicator
  (In an acid, blue litmus paper turns red. In a base, red litmus paper turns blue)

Question 11

Describe FXN and know what it looks like:
Pinch Clamp

Answer 11

Hold/secure objects tightly

Question 12

Describe FXN and know what it looks like:
Pipet

Answer 12

Transfer small quantities of liquids

Question 13

Describe FXN and know what it looks like:
Spatula

Answer 13

Tool with flat edge used to mix/transfer materials

Question 14

Describe FXN and know what it looks like:
Test Tube

Answer 14

uh tbh idk the exact fxn but it probably will be obvious

Question 15

Describe FXN and know what it looks like:
Test Tube Brush

Answer 15

Clean glassware; long/narrow

Question 16

Describe FXN and know what it looks like:
Test Tube Clamp

Answer 16

Holds test tube while heating (to pvt burned)

Question 17

Describe FXN and know what it looks like:
Test Tube Rack

Answer 17

Holds many test tubes

Question 18

Describe FXN and know what it looks like:
Thermometer

Answer 18

Measure temperature

Question 19

Describe FXN and know what it looks like:
Tongs

Answer 19

Grip/lift (hot) objects

Question 20

Describe FXN and know what it looks like:
Watch Glass

Answer 20

• Evaporate liquid
• Hold solids (weighing)
• Cover for beaker

Question 21

Describe FXN and know what it looks like:
Wire Guaze

Answer 21

Square interwoven wire used to support container during heating

Question 22

Be able to describe/name the hazard associated with the symbol. Refer to notes

Question 23

T/F: Open toed shoes are permissible in the lab. Wearing goggles is optional

Answer 23

False, everyone needs to be wearing closed toed shoes and should always wear eye goggles

Question 24

How do you correctly read the volume of water when using a graduated cylinder?

Answer 24

You measure at eye level and measure at the miniscus (curved surface). You do this because water is adhesive/cohesive and will stick to the side of the glass.

Question 25

How do you convert between temperatures?

What is the formula to find Farenheight?
What is the formula to find Kelvin?

Answer 25

F -> C -> K

F = 1.8(C) + 32
K = C + 273

Question 26

Convert 212°F to Celcius and Kelvin

Answer 26

= 100°C
= 373K

Question 27

Convert 298K to Celcius and Farenheight

Answer 27

= 25°C
= 77°F

Question 28

Why did we burn the almond and use the water to take the temperature?

Answer 28

Heat lost by almond = heat gained by water

mCΔT = mCΔT

Question 29

What is the formula to find the heat gained by the water when we burned the almond? Know what the units are

Answer 29

Q (heat/energy) = mc (Tf-Ti)

• m = mass(g), assume density of water 1g/mL
• s or c = 1cal/g°C
• t = temperature (C)

Question 30

A copper penny was weighed in at an initial mass of 2.5g. After chemicals were added to remove the internal zinc, the penny (pure copper) weighed in at 0.5g. What percentage of the penny was made of pure copper?

Answer 30

20%

Question 31

Using chromatography paper (TLC), 3 colors were dotted on the paper and placed into a soluted. After some time the TLC paper was able to be read. Dot A had one dot in its lane, Dot B had one dot in its lane, and Dot C had two dots in its lane. Which color dot was made from a mixture of colors? Explain

Answer 31

Dot C because two dots were in its lane, meaning at least two colors were present. This makes doc C a mixture. Dot A and B are pure substances since only one dot appeared.

Question 32

Name all important polyatomic ions and know how to name covalent compounds

Question 33

Using this equation, known which way the RXN will shift under these conditions:
Fe⁺³ + SCN⁻ = FESCN⁺² + heat

• Add KSCN
• Add FeNO₃
• Increase temp
• Decrease temp
• Add Na₂PO₄

Answer 33

• Add KSCN = ↑[SCN] = shift RIGHt = turns dark red/orange
• Add FeNO₃ = ↑[Fe] = shift RIGHT = turns dark red/orange
• Increase temp = shift LEFT = yellow
• Decrease temp = shift RIGHT = dark red/organge
• Add Na₂PO₄ = ↓[Fe] = shift LEFT = yellow

Question 34

Know the different types of phase changes

• Solid -> Liquid
• Liquid -> Solid
• Solid -> Gas
• Gas -> Solid
• Liquid -> Gas
• Gas -> Liquid

Answer 34

• Solid -> Liquid = melting
• Liquid -> Solid = freezing
• Solid -> Gas = sublimation
• Gas -> Solid = deposition
• Liquid -> Gas = evaporation/vaporization
• Gas -> Liquid = condensation

Question 35

Be able to identify/draw the graph that relates to Boyles Law

Answer 35

Boyles law = inversly related

Question 36

What is the formula for Boyles Law?

Answer 36

P1V1 = P2V2

Question 37

Know the chart on the notes that helps you identify the structure when drawing a lewis diagram