WorksheetsUNIT 9 EXAM
Total questions: 18
Worksheet time: 18mins
Which of the following is not an importance of knowing the location of safety equipment in the classroom?
You should know the location in case your teacher gives you a test.
You should know the location in case of a small fire.
You should know the location in case of a large chemical spill on your clothing or body.
You should know the location in case of a harmful substance getting into your eyes.
What would rulers, electronic scales, and beakeres be useful for?
Following all safety rules in the lab.
Observing the chemical properties of substances.
Measuring the mass, length, and volume of substances.
Performing experiments in the lab.
Which of the choices below could be the hypothesis in an experiment?
Tomato plants require 8 hours of direct sunlight to thrive.
Plant a tomato seedling 6 inches deep of a large pot.
If tomato plants receive 4 hours of direct sunlight, then they will thrive.
How much sunlight do tomato plants need to thrive?
In order to be able to conduct an investigation, the problem must be testable or measurable.
TRUE
FALSE
When should you tie back long hair or baggy clothing?
When working with chemicals
When working with a Bunsen burner
When doing dissections.
Any time you are working in the lab.
What is this tool used for?
to find the temperature of a substance
used to stir liquids
used to find the mass
used to add drops of liquid
Matching - Identify whether each statement represents a safe or unsafe situation.
A student took some of the extra lab supplies without permission because he wanted to do experiments at home.
UNSAFE
Several students left a spill on the floor because they did not have time to clean it up at the end of class.
UNSAFE
Ty yanked the microscope cord out of the socket in order to turn it off at the end of class.
UNSAFE
Olivia read all of the steps to the procedure, and followed them properly, while conducting her experiments.
SAFE
Alyssa loved chewing gum, but she always made sure to throw it away before participating in a lab.
SAFE
If a fire erupts, immediately
(a)Which of the following could be a scientific problem?
Place 25 ml of baking soda into a beaker with 50 ml of vinegar.
If you add baking soda to vinegar, then a chemical reaction will occur.
Baking soda and vinegar react chemically, as evidenced by the bubbles formed when they are combined.
What happens when you add baking soda to vinegar?
Which of the following is NOT a way that scientists ensure reliability in their experiments?
Scientists perform the experiment before making a hypothesis to ensure they are correct.
Scientists make sure to follow all of the necessary steps.
Scientists run multiple trials of the experiment to verify the results.
Scientists follow safe lab practices and proper equipment use.
How should you dispose of broken glass in the science lab?
It should always be placed into a trash can.
Carefully wrap it in a paper towel and throw it away.
Carefully place it into a sharps container.
Leave it on the table so that you do not get cut.
Hypothesis
Educated guess based on research
Observation
Information gathered through the senses
Inference
A guess or opinion made based on an observation
The variable that is observed by an scientist.
Controlled Variable
Dependent Variable
Independent Variable
The one factor that a scientist changes during an experiment.
Controlled Variable
Dependent Variable
Independent Variable
