Lab Safety
True/False:
You can eat and drink anything you want in the lab.
FALSE
0.5 x 1010
Is that a valid scientific notation?
NO!
(The number in the front should be bigger than 1 and smaller than 10.)
True or False:
When we do dimensional analysis (unit conversion), we divide the numbers at the top.
FALSE
(Multiply at the top and divide at the bottom.)
Non-zero numbers are always considered significant.
TRUE
True/False:
daL is a unit for mass.FALSE
If you break a beaker in the lab, where should you dispose the broken pieces of glassware?
Broken Glass Container
Negative exponent indicates large number.
FALSE
(Negative exponent means small number)
How many minutes are in 1 hour?
60 minutes
How many sig fig does this number have?
14.00 g
4
Which unit is bigger: cm or hm?
hm
Can you use fire extinguishers on a person?
NO!
Convert the following into scientific notation:
58000
5.8 x 104
Convert 3.00 miles (mi) into meters (m).
4830.917874 m
(4830m considering sig fig)
0.00062 km
2
1km = ________ dm
10,000 dm
What method are you supposed to use to smell a chemical?
Wafting method
Convert the following into regular number:
3.0 x 105
300,000
Convert 5.00 gallon (gal) into cm3
18950 cm3
(19000 cm3 considering sig fig)
Give answer with correct number of sig fig:
4.5m + 3.50m
8.0 m
(Lowest number of decimal places)
540 mg = ____________ dag
0.0540 dag
How many broken glass containers are in the lab?
3
Convert the following into cm:
9.8 x 10-3 km
9.8 x 103 cm or 9800 cm
Convert 150. ounces (oz) into grams (g).
(Give answer with correct number of sig fig)
4260 g
(4256.25 g without sig fig consideration)
Give an answer with correct number of sig fig.
60.m / 4 sec
(15 m/s without sig fig)
6.23 x 105 cL = ____________ kL
6.23 kL