Lab Practical 1

Question 1

Conversions:

• Kilo
• Centi
• Milli
• Micro

Answer 1

• Kilo = 1000m (thousands)
• Centi = 0.01m (hundredths)
• Milli = 0.001m (thousandths)
  Micro = 0.000001m (millionths)

Question 2

Fahrenheit to Celsius

Answer 2

C = (F-32)/1.8

Question 3

Celsius to Fahrenheit

Answer 3

F = 1.8(C) + 32

Question 4

No heat (absolute zero)

Answer 4

Kelvin = 0
Celsius = -273
Fahrenheit = -459

Question 5

Water freezes

Answer 5

Kelvin = 273
Celsius = 0
Fahrenheit = 32

Question 6

Standard room temp

Answer 6

Kelvin = 293
Celsius = 20
Fahrenheit = 68

Question 7

Average body temp

Answer 7

Kelvin = 310
Celsius = 37
Fahrenheit = 98.6

Question 8

Water boils at

Answer 8

Kelvin = 373
Celsius = 100
Fahrenheit = 212

Question 9

Density formula

Answer 9

density (p) = mass (m) / volume (v)

Question 10

Compound Microscopes

Answer 10

• max magnification 1000x
• translucent/transparent objects
• lowest lens to highest
• 2D image

Question 11

Stereomicroscope

Answer 11

• opaque objects

- 3D image

Question 12

Total Magnification

Answer 12

• eyepiece = 10x
• objective lens (10, 40, 100)
• Total = 100x, 400x, 1000x

Question 13

Stereomicroscope four light positions

Answer 13

• Off
• Incident light only
• Transmitted light only
• Both transmitted and incident light

Question 14

Stereomicroscope magnification

Answer 14

• eyepieces (10x)
• lens (2x, 4x)
  = 20x or 40x

Question 15

Benedict’s Test

Answer 15

• Benedict’s reagent -
  normally bright blue
• w/ sugars (glucose) and heated, turns green - yellow - orange - red

Question 16

Iodine Test

Answer 16

• normally amber/orange

- starch interacts - black or dark blue/black

Question 17

Biuret Test

Answer 17

• Biuret reagent - normally pale blue
• whole protein - purple
• protein fragments (peptides/polypeptides) - pink

Question 18

Silver Nitrate Test

Answer 18

• Silver Nitrate reagent - clear

- chloride ions react w/ silver ions to form white, cloudy precipitate of silver chloride

Question 19

Oils

Answer 19

• lipids are slippery feeling

- don’t dissolve in water (don’t evaporate either according to test)

Question 20

Amylase

Answer 20

Digestive enzyme produced by salivary glands in mouth and pancreas

• catalyst for hydrolysis of starch molecules into maltose
• breaks down starch very rapidly (fizzes/foams)