Lab Safety
True or False?
If you spill any material, clean it up before the teacher notices.
False
What is accuracy?
How close data comes to the theoretical.
How many significant figures does 91200 have?
Three
The red section of the hazard diamond stands for what?
Flammability
What is the bridge to dimensional analysis
Conversion Factors
Are T-Shirts, sandals and loose fitting clothing appropriate for the lab?
No
What is precision?
How close data points are to each other.
How would you correctly round 18,524 to 2 significant figure?
19,000
What does a 4 in the blue section mean?
That the chemical is severely hazardous to your health (deadly/fatal)
How do you convert m to km?
Divide the given quantity by 1000
If you spill acid on your skin in the lab, what should you do?
Rinse with water.
How do we measure accuracy? Explain.
With % Error
(data-theoretical/theoretical) x 100
Round this number to the THIRD significant figure:
19,823
19,800
Describe the symbol for Radioactive
Yellow with 3 black fans
How do you convert kilograms to grams?
Multiply the given quantity by 1000
Does hot glass and cold glass look the same?
Yes
Can data points be both precise and accurate?
Yes
What is the correct conversion of 9.25 x10^4 to regular notation?
92,500
Will the common use for a chemical be listed on a MSDS sheet?
No it will not
How do you convert g to mg
multiply the given quantity by 1000
Should Alcohol or any other flammable liquid be heated with a Bunsen Burner?
No! Only heat using a water bath.
What are the 4 steps in measuring precision using Average Standard Deviation?
1. Write the data in numerical order
2. Find the Median
3. Subtract median from every data point
4. Find Average of the difference
What is the correct conversion of 0.00348 to scientific notation?
3.48 x10 -3
What number represents moderate risk?
2
The meaning of the SI prefix milli is?
10^-3, 1/1000 or (1 thousandth)