Which piece of equipment would be BEST to measure 5 mL of a liquid?
a) A disposable dropper
b) A 50 mL Beaker filled halfway between the 0 and 10 mL markings
c) A 100 mL Graduated cylinder
d) A 50 mL Erlenmeyer flask filled halfway between the 0 and 10 mL markings
e) A 10 ml Graduated cylinder
2. What is the BEST numerical value for the quantity of liquid shown below?
a) 6.5 mL
b) 7.5 mL
c) 6 mL
d) 6.2 mL
e) 6.25 mL
3. Which of the following would NOT be considered a valid Sources of Error?
I: Calculation errors II: Contamination III: Using the wrong solution for a reaction
a) I only
b) II only c) III only
d) both I & II
e) both I & III
4) Which of the following is considered a safety precaution that should be followed?
I: Wearing goggles II: Reading the Lab procedure before class III: Having proper ventilation in the Lab
a) only I b) only II
c) Only III
d) I & III
e) ALL should be followed
5) If you take too much of a certain chemical, what should be done with the extra amount?
a) Carefully return the extra amount to the original container so that nothing is wasted.
b) Carefully dump the chemical down the sink with plenty of water.
c) Dispose of the chemical in a proper, clearly labelled waste container.
