1 laboratory techniques

Question 1

T or F
Graduated cylinders are used to deliver liquids while burettes are used to contain liquids

Answer 1

False (graduated cylinders are for containing while burettes are for delivering liquids)

Question 2

In measuring liquids and theres a convex meniscus, do you look below or above?

Answer 2

above

Question 3

For a concave meniscus, do you look? (above or below)

Answer 3

below

Question 4

most accurate volumetric glassware for measuring liquids

Answer 4

burette

Question 5

least accurate glassware for measuring liquids

Answer 5

beaker

Question 6

enumerate the volumetric glass wares used in order of least to most accurate

Answer 6

4 beaker
3 Erlenmeyer flask
2 graduated cylinder
1 burette

Question 7

the flask used to prepare stock and diluted solutions

Answer 7

volumetric flask

Question 8

For a concave meniscus, do you look? (above or below)

Answer 8

below

Question 9

What step in this lab exercise is done to ensure the precision of measurements in mass

Answer 9

doing the steps repeatedly through trials

Question 10

A 100 mL ice with 25 mL tap water has a temperature of 2 degrees Celsius. What is expected to happen after 10 minutes at room temperature

Answer 10

it will have a temperature greater than 2 degrees celsius

Question 11

T or F

top loading scale is more accurate than the analytical scale

Answer 11

false (analytical scale is more acc)

Question 12

Why is the analytical scale more accurate?

Answer 12

It can measure up to four decimal points

Question 13

enumerate the factors than can affect the results of the analytical scale

Answer 13

• is the balance leveled?
• air
• vibrations
• small particles in the scale
• moisture

Question 14

Density formula

Answer 14

density = mass / volume

Question 15

What happens to the temperature of boiling water when left in room temperature for 10 minutes?

Answer 15

the temperature will decrease as it cools down

Question 16

thickness formula

Answer 16

thickness = volume / l x w