Lab Safety
Name one item of personal protective equipment (PPE) you must wear during experiments.
Goggles
What is the first step of the scientific method?
Asking a question about something we observe.
What role does a control variable play in an experiment?
It is kept constant to ensure a fair test.
What type of measurement tool do we use to measure temperature?
Thermometer
If a cube has a side length of 3 cm, what is its volume?
27 cm3
When is it safe to eat in the science lab?
Never.
What word describes an educated guess about the answer to your research question?
Hypothesis
In an experiment to determine how different liquids affect plant growth, what would be the dependent variable?
Height/Length of the plant
True or False: You should use a beaker to measure the volume of water?
False. You should use a graduated cylinder.
An object has a mass of 50 g and a volume of 10cm3. What is its density?
5 g/cm3
How do you smell chemicals in the lab?
You hold the chemical away from your face and waft the odour toward your nose.
True or False. A hypothesis should be based on someone's opinion.
False. It should be testable and NOT based on opinion.
Which of the following is an independent variable in an experiment measuring the effect of study time on test scores?
a. Test scores
b. Study time
c. Student's age
d. Number of students
B) Study Time
If the balance reads 0.02 before your place your object on it, what should you do?
Before you place your object on it, you should TARE/ZERO the scale so that you get an accurate measurement.
A block of metal has a density of 10 g/cm3 and a volume of 2 cm3. What is its mass?
20 g
Why is it important to know the location of the safety shower?
So that you can quickly remove a spilled chemical or put out a fire.
Once you have your data from an experiment, what should you do with it.
Analyse it by creating a graph or chart.
When testing the effect of pH on enzyme activity, what would be a control variable?
a. Enzyme activity
b. Temperature
c. pH level
d. Type of enzyme
B) Temperature & D) Type of Enzyme
Where do you take your measurement when reading the volume of a liquid in a graduated cylinder?
Take the reading at EYE LEVEL and read from the bottom of the meniscus.
If the mass of a liquid is 30 g and its volume is 10 mL, what is its density?
3 g/mL
What should you do if you spill a chemical?
Check the Safety Data Sheet (SDS) for safety & spill instructions and let the teacher know.
True or False: You can only make a conclusion if your hypothesis is correct.
False. You can make conclusions any time. A hypothesis isn't always correct. We can still learn from and ask more questions from an incorrect hypothesis.
Which of the following is an example of a dependent variable in an experiment examining the effect of air pressure on balloon inflation?
a. Type of balloon
b. Amount of air pressure
c. Size of balloon inflation
d. Temperature of the room
C) Size of Balloon inflation
How do you measure the volume of an irregularly shaped object?
By putting it into a graduated cylinder and measuring the difference in volume.
The volume of a rock is measured using a graduated cylinder with 43 mL of water. After the rock is put in, the volume is 59mL of water. What is the volume of density of the rock if it has a mass of 5g.
0.3125 g/mL