Laboratory Safety and Procedures Quiz

When are goggles used in the laboratory?

• all of the time

• never

• only when you want to wear them

What should never be dispensed near an open flame?

• sugar

• flammable materials

• water

• none of these

What is this safety symbol?

• safe zone

• fire drill

• toxic

When you heat a substance, it should be pointed___________.

• Toward no other person
• always at a person

• only towards the ground

• only towards the sky

What is the following lab equipment?

• thermometer

• beaker

• balance beam

What is precision? Give an example of measurements.

• Measurements are close to each other

• Turning at the right time

• Dancing in the rain

What is accuracy?

• Measurements that are never true

• Measurements are closest to the true value

• Measurements that are only odd numbers

• Measurements that are only even numbers

Measure the liquid in the picture. Read from the bottom of the meniscus in the middle. Don’t forget the estimated digit of uncertainty!

• 150.0 ml

• 210.0 ml

• 250.0 ml

• 50.0 ml

Read the 4-beam balance in the picture. Add all numbers. Don’t forget the digit of uncertainty! The 4 beam balance should go 3 places past the decimal.

Which measurement contains 4 significant figures?

• 0.00800L

• 0.00804L

• 0.02044L

• 0.00140L