1. LAB EQUIPMENT
Scientists use “tools”, or pieces of lab equipment to perform certain tasks when conducting an experiment

2. ACCURACY VS PRECISION
It is very important that scientists record and report their measurements (data) as accurately and precisely as possible

3. ACCURACY VS PRECISION
Accuracy – how correct a measurement is; the more correct a measurement is, the more accurate it is.
Precision – the exactness of a measurement; determined by the number of increments included in the measurement (Ex: decimal places)

4. Example

6. Each of five students used the same ruler to measure the length of the same pencil. These data resulted: cm, cm, cm, cm, cm. The actual length of the pencil was cm. Describe whether accuracy and precision are each good or poor for these measurements.

7. Equipment and Function

9. THERMOMETER Measures temperature Read at EYE LEVEL!
Allow time for accurate reading to occur
Keep the bulb submerged and away from the sides of the container

11. COMPOUND MICROSCOPE Used to magnify objects
Light microscope – light rays pass through the specimen and magnify the image. Useful to view cells.

13. MICROSCOPE SLIDE/ SLIP COVER
Used to hold and cover specimens to be viewed under a microscope

14. ELECTRON MICROSCOPE
Used by scientists to view objects too small to be seen through a light microscope. Uses electron beams instead of light.
Much higher resolution (Clearer images at higher magnification)

15. LIGHT VS ELECTRON Light Electron Living Objects
Natural color and movement can be seen
Poor resolution
Easy to use
Inexpensive
Objects CANNOT be alive
Black and white images, no movement
Excellent resolution
Highly trained user
Very expensive

17. METRIC RULER Used to measure length
The more lines there are, the more precise it is!

19. TRIPLE BEAM BALANCE
Measures mass

20. LIQUIDS
In the laboratory, glassware is used for measuring and dispensing liquids.
Can anyone tell me why glass is the best choice?

21. LIQUIDS
Some tools are fine for dispensing liquid, but not for measuring.

23. ERLENMEYER FLASK
Holding, storing, and transferring large amounts of liquid
NOT ACCURATE!

25. BEAKER Holding, storing, and transferring large amounts of liquid
NOT ACCURATE!

27. BURETTE/ PIPETTE Dispenses measured amounts of liquid
Very accurate and precise!

29. PIPETTE/DROPPER
Dispenses small amounts of liquid in drops at a time

31. GRADUATED CYLINDER Accurately measures liquid in milliliters
Read volume at eye level at the meniscus – the curve in the surface of a liquid.

33. TEST TUBE/ ACCESSORIES
Holding, mixing, and storing small amounts of liquid
Place in a test tube rack for holding
Use tongs – not bare hands – for handling
Clean with a test tube brush

35. PETRI DISH
Grow cultures
Observe small animal behaviors

37. MORTAR AND PESTLE Used to crush and grind large substances
Often used in pharmacies

39. SPATULA
Used to transfer small amounts of powder or granular substance

41. HOT PLATE
Used to heat liquids in the lab

43. HAND LENS
Used to magnify objects or look at them more closely

44. DISSECTION KIT

46. FORCEPS
Used to hold a specimen or parts of a specimen while studying

48. PROBE
Used to gently manipulate a specimen

50. SCALPEL
Used to make fine cuts in a specimen

52. DISSECTION TRAY
Used to hold specimens for dissection and provide a way to pin them.

54. DISSECTING PINS
Used to hold a specimen in the dissecting tray

56. DISSECTING SCISSORS Used to cut specimens for dissecting
Why is it so important that they be especially sharp?

58. BUNSEN BURNER Used as a source of heat/ flame in the lab
Uses gas to produce a flame
Reaches temperatures up to 1500 degrees Celsius!

60. STRIKER
Used to light a bunsen burner

62. FUNNEL
Used to transfer liquids or powders without spilling

64. GLASS STIRRING ROD
Used to stir liquids

66. SAFETY GOGGLES
Protect eyes from liquids, glass, etc in the lab

68. LAB APRON
Used to protect clothing from spills in the laboratory