Lab safety
True or False
Personal glasses are just as good as safety googles, a face shield, or safety glasses
False
What is the difference between accuracy and precision?
Accuracy is how correct a measurement is; precision is how consistent measurements are.
What is a conversion factor?
A ratio of equivalent values that equals 1.
Write 5,000 in scientific notation.
5 × 10³
List 2 types of clothing/jewelry that is not allowed in lab
No baggy or ripped clothing.
No open toed shoes
No loose dangling jewelry, no rings
What is the SI unit for mass?
Kilogram kg
How many inches are in 1 foot?
12 inches
Write 0.0045 in scientific notation.
4.5 × 10⁻³
True or False: If you have extra time during a lab you can use extra chemicals and or go into chemical storage to get more and complete unauthorized labs.
FALSE! Never performed unauthorized labs!
You should never access chemical storage.
A student measures an object three times and gets 71 g, 71.1 g, and 70.9 g. The accepted value is 65 g. Are the measurements accurate, precise, both, or neither?
Precise but not accurate.
Convert 250.4 cm to feet
1 in = 2.54 cm
12 in = 1 ft
8.22 ft.
Write 101,000 in scientific notation.
1.01 × 10⁵
When should you wash your hands?
before leaving the lab or when done
Three students measure a plant as 30 cm, 45 cm, and 36 cm. What is the average?
37 cm
How many seconds are in one year using
365 days = 1year
24 hours= 1 day
60 min = 1 hour
60 sec = 1 min
31,536,000 seconds.
Convert 2.057 × 10² into standard notation
205.7
if you hair is long, before lab you should_____
tie it back
What is the SI unit for temperature, and what formula is used to convert Celsius to Kelvin in these notes?
Kelvin (K); K = °C + 273.
Explain why the units must be placed on opposite sides of the “picket fence” when doing dimensional analysis
So matching units cancel, leaving the desired unit.
Convert 3.1 × 10⁻⁴ to standard notation.
0.00031