1. Lab Safety, Lab Equipment, & Measurement Quiz Review

2. Get out the safety scenarios from yesterday
Get out the safety scenarios from yesterday. Finish them if you have not yet. Also, grab the sheet from the front for today’s notes.

3. Test tube
Cylindrical-shaped glass tube used primarily in laboratories

4. Test tube brush
Used to clean test tubes

5. Pipet
Device used for measuring and transferring small volumes of liquid

6. Erlenmeyer flask
A cone shaped container used for holding liquids

7. Beaker
A wide mouth container used to hold liquids

8. Graduated cylinder
Used for measuring volume

9. Funnel
Hollow cone-shaped tool used for transferring liquids

10. Goggles
Used to protect eyes during experiments

11. Name the lab equipment

12. The basic unit of length in the SI system is the …
The basic unit of length in the SI system is the meter

13. The two units that measure the length of smaller objects are, …
millimeter
centimeter

14. The shorter lines on the metric ruler are called…
millimeters

15. The longer lines on the metric ruler are called…
centimeters

16. Measuring Length How many millimeters are in 1 centimeter?
1 centimeter = 10 millimeters
How many millimeters are in 1 centimeter?
What is the length of the line in centimeters? _______cm
What is the length of the line in millimeters? _______mm
What is the length of the line to the nearest centimeter? ________cm
HINT: Round to the nearest centimeter – no decimals.
Ruler:

17. How many millimeters?
39 mm

18. How many millimeters?
60 mm

19. How many centimeters?
8.5 cm

20. How many millimeters?
103 mm

21. How many millimeters?
19 mm

22. How many centimeters?
5.2 or 5.3 cm

23. How many centimeters?
9.7 cm

24. Mass refers to the amount of matter in an object.
Triple Beam Balance

25. The basic unit of mass in the SI system is the…
The basic unit of mass in the SI system is the gram.

26. A smaller object’s mass such as a paper clip would be measured in
Smaller objects such as a paper clip would be measure in milligrams.

27. _______ + ______ + _______ = ________ g
Measuring Mass
We will be using triple-beam balances to find the mass of various objects.
The objects are placed on the scale and then you move the weights on the beams until you get the lines on the right-side of the scale to match up.
Once you have balanced the scale, you add up the amounts on each beam to find the total mass.
What would be the mass of the object measured in the picture?
_______ + ______ + _______ = ________ g
Top Image: Bottom Image:

28. Measuring Mass – Triple-Beam Balance
1st – Place the film canister on the scale.
2nd – Slide the large weight to the right until the arm drops below the line. Move the rider back one groove. Make sure it “locks” into place.
3rd – Repeat this process with the top weight. When the arm moves below the line, back it up one groove.
4th – Slide the small weight on the front beam until the lines match up.
5th – Add the amounts on each beam to find the total mass to the nearest tenth of a gram.

29. https://www. wisc-online

30. https://www. wisc-online

31. Measuring Volume
We will be using graduated cylinders to find the volume of liquids and other objects.
Read the measurement based on the bottom of the meniscus or curve. When using a real cylinder, make sure you are eye-level with the level of the water.
What is the volume of water in the cylinder? _____mL
What causes the meniscus?
A concave meniscus occurs when the molecules of the liquid attract those of the container. The glass attracts the water on the sides.
Top Image: Bottom Image:

32. Meniscus
The curved surface of a liquid

33. Measuring Liquid Volume
What is the volume of water in each cylinder?
Images created at A B C
Pay attention to the scales for each cylinder.

34. Measuring Solid Volume
10 cm
9 cm
8 cm
We can measure the volume of regular object using the formula length x width x height.
_____ X _____ X _____ = _____
We can measure the volume of irregular object using water displacement.
Amount of H2O with object = ______ About of H2O without object = ______ Difference = Volume = ______
Click here for an online activity about volume. Choose Lessons  Volume & Displacement

37. Measuring Temperature

38. Thermometers are very fragile and must be handled with care
Thermometers are very fragile and must be handled with care. Read the following rules for the proper use of a thermometer.
1. Never "shake down" a thermometer to reset it.
2. Never use a thermometer to stir a liquid.
3. Never allow a thermometer to touch the bottom of a container that is being heated.

39. Safety Video

40. False
You only need to use safety goggles when working with acids.

41. False
If you are unsure about the identity of a chemical, it is okay to taste and smell it.

42. False
Only major accidents should be reported to the teacher.

43. True
All test tubes need to be thoroughly cleaned with soap and water before re-using them.

44. True
The proper way to smell a chemical is to carefully waft the vapors towards your nose.