Examen Prelab # 1

Question 1

Measuring Temperature 1

Answer 1

• Bkr “A” + 150 mL HW
• Bkr “B” + 150 mL CW
• Bkr “C” + 150 mL TW

Question 2

Measuring Temperature 2

Answer 2

Thermometer’s bulb center eacher Bkr

Question 3

Measuring Temperature 3

Answer 3

• Thermometer’s bulb can’t touch bottom or sides of Bkr
• Don’t stir anything thermometer

Question 4

Measuring Temperature 4

Answer 4

Read thermometer while still in water

Question 5

Measuring Volume 1

Answer 5

Use burette, graduated cylinder, or pipetter

Question 6

Measuring Volume 2

Answer 6

Red coloured water + graduated cylinder. Don’t fill top

Question 7

Measuring Volume 3

Answer 7

Measure volume bottom meniscus, eye at same level as liquid surface

Question 8

Measuring Volume 4

Answer 8

Read meniscus from bottom

Question 9

Testing Odors Safely 1

Answer 9

• Waft hand over test tube
• Carefully sniff fumes

Question 10

Testing Odors Safely 2

Answer 10

Don’t inhale fumes directly

Question 11

Testing Odors Safely 3

Answer 11

• Use fume hood in case poisonous or irritating fumes are evolved
• Don’t waft

Question 12

Trasnferring Liquids 1

Answer 12

• Use finger’s back remove Erlenmeyer’s stopper
• Don’t place it workbench

Question 13

Trasnferring Liquids 2

Answer 13

Hold stopper w/ fingers

Question 14

Trasnferring Liquids 3

Answer 14

• Bkr “A” + stirring rod
• Pour green liquid

Question 15

Trasnferring Liquids 4

Answer 15

Hold stirring rod against Erlenmeyer’s lip

Question 16

Trasnferring Liquids 5

Answer 16

Pour Erlenmeyer’s green liquid into Bkr “A” slowly down stirring rod

Question 17

Trasnferring Liquids 6

Answer 17

Replace Erlenmeyer’s stopper

Question 18

Trasnferring Liquids 7

Answer 18

Red coloured water from graduated cylinder into test tube

Question 19

Decanting and Filtration 1

Answer 19

Test tube w/ red liquid + tbsp pepper

Question 20

Decanting and Filtration 2

Answer 20

Place stopper Ttb’s top, shake

Question 21

Decanting and Filtration 3

Answer 21

Wait pepper sink bottom

Question 22

Decanting and Filtration 4

Answer 22

Decant supernatant liquid w/ other Ttb

Question 23

Decanting and Filtration 5

Answer 23

Bkr “B” + 100 mL water + tbsp pepper

Question 24

Decanting and Filtration 6

Answer 24

Move Bkr “B” w/ stirring rod, leave pepper separated clear fluid

Question 25

Decanting and Filtration 7

Answer 25

- Bkr "C" + stirring rod - Should touch Bkr's wall

Question 26

Decanting and Filtration 8

Answer 26

Hold stirring rod against Bkr "B"'s lip containing supernatant liquid

Question 27

Decanting and Filtration 9

Answer 27

- Pour liquid - Run down rod into Bkr "C"

Question 28

Decanting and Filtration 10

Answer 28

- Iron ring + ring stand - Irong ring + SprFnn (Prepare system)

Question 29

Decanting and Filtration 11

Answer 29

SprFnn + 50 mL water + 50 mL alcohol

Question 30

Decanting and Filtration 12

Answer 30

Place Bkr under SprFnn

Question 31

Decanting and Filtration 13

Answer 31

- Open SprFnn - Transfer water to Bkr

Question 32

Decanting and Filtration 14

Answer 32

Close SprFnn until there's blue alcohol

Question 33

Decanting and Filtration 15

Answer 33

- Iron ring + ring stand + clay triangle + funnel (Prepare separatory system)

Question 34

Decanting and Filtration 16

Answer 34

- Funnel + filter paper - Pour Bkr "C"'s liquid through filter paper - Catch unsinked pepper

Question 35

Trasporting Balance 1

Answer 35

Check all riders @ zero

Question 36

Trasporting Balance 2

Answer 36

- Check if balance has lock mechanism - Check it's on

Question 37

Trasporting Balance 3

Answer 37

- One hand under balance - Other beam's support

Question 38

Trasporting Balance 4

Answer 38

Properly carry to work area, then back

Question 39

Measuring w/ Balance 1

Answer 39

- All riders @ zero - Check pointer move freely and equally along scale - Wait until stops zero - Use AdjCrw equalizing movement

Question 40

Measuring w/ Balance 2

Answer 40

- Object massed + wax paper + pan - Never hot objects directly - Never chemicals directly - Container's mass - total mass = object's mass

Question 41

Measuring w/ Balance 3

Answer 41

- Move riders, beginning largest - Beams notched, check if riders notched before measuring - Swing should move = distance U & D zero point

Question 42

Measuring w/ Balance 4

Answer 42

Σ Masses = object's mass

Question 43

Using Burette 1

Answer 43

Place clamps @ middle ring stand

Question 44

Using Burette 2

Answer 44

Place burette, carefully, into clamps

Question 45

Using Burette 3

Answer 45

Colored water + burette

Question 46

Using Burette 4

Answer 46

Place Bkr under burette

Question 47

Using Burette 5

Answer 47

Move stopcock avoid or allow water flow

Question 48

Using Pipette 1

Answer 48

Place bulb @ pipette's tap

Question 49

Using Pipette 2

Answer 49

Absorb coloured water from Bkr

Question 50

Using Pipette 3

Answer 50

Expel coloured water into Erlenmeyer Flask