Exam year 7 semester

Which part of the Bunsen flame is the hottest?

• A
• B
• C
• D

The gas should be turned on ____________ lighting the match.

• Before

• After

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.

When is it OK to eat or drink in the lab?

• Always
• Never

If you break glassware in the lab, you should...

• Tell the teacher
• Clean it up quickly before the teacher notices
• Scream at the top of your lungs

What do you call the part of the burner that "twists" ?

• Base

• Collar

• Cylinder

Name this part of the Bunsen Burner: A

• Barrel

• Collar

• Air Hole

• Base

In a scientific experiment, the one variable that is purposely changed to test a hypothesis is called the ____________ variable.

• independent
• dependent
• controlled
• responding

A possible explanation for a set of observations or answer to a scientific question is called a(n)

• prediction
• hypothesis
• theory
• law

How long is the black line?

• 7 cm

• 10 cm

• 1 cm

• 2 cm