Lab Safety and Hazards
How should left over chemicals be disposed of after a lab?
According to the procedure or the teacher
Which piece of equipment is best to use for measuring volume of liquids?
Graduated cylinder
What is the mnemonic we have used to to perform metric conversions?
King Henry Died By drinking chocolate milk
The measurement 0.00562 mg has how many significant figures?
3
Leading zeros are never significant.
What is the answer to the following equation using the correct number of sig figs: 10.56 + 2.4?
13.0
Show should you smell a chemical in a laboratory?
Waft it towards you
_______________ is how close a measurement is to the accepted value
Accuracy
Using the mnemonic technique:
Convert 2 centiseconds to dekaseconds
0.0002 dag
How many significant figures does 0.001023 seconds have?
4
Leading zero's are never significant.
Captive zero's are always significant
What is the answer to the following equation using the correct number of sig figs: 0.50 x 250?
130
Draw the corrosive symbol
Description: A picture of two test tubes spilling a liquid onto a surface or hand causing damage and steam.
What piece of glassware looks like an upsidedown ice cream cone with a narrow neck and flat, wide bottom?
Erlenmeyer Flask
Using any technique:
convert 72.1 velociraptors to hectovelociraptors
0.721 hectovelociraptors
How many significant figures does 1.350 x 10-4 have?
4 (10-4 is not included)
What is the answer to the following equation using the correct number of sig figs: 98.30-22?
76
If an NFPA diamond label for a chemical has a 1 in the red diamond and a 3 in the yellow diamond, the chemical is...
Slightly flammable & extremely reactive
In a graduated cylinder, the volume should be measured at the __________ of the meniscus.
Bottom
What is the conversion factor for millimeters to meters?
1000 mm / 1m
The graduations on an instrument determine the ____________ of that instrument.
Precision
What is the answer to the following equation using the correct number of sig figs: 0.40/100?
0.004
Describe the properties of a substance with a skull and crossbones warning label
Toxic, poisonous, deadly
What is the metric standard unit of mass?
Kilogram (kg)
Using the railroad tracks (picket fence) method:
convert 7064 decifrogs to kilofrogs
(7064 decifrogs/1)x(1 frogs/10 decifrogs)x(1kilofrogs/1000 frogs)=0.7064 kilofrogs
In scientific notation, the _____________ determines the direction and amount of places the decimal needs to move.
Exponent.
Positive exponents move the decimal to the left.
Negative exponents move the decimal to the right.
What is the answer to the following equation using the correct number of sig figs: 5 x 35?
200