Metric Conversions
What is the SI unit for distance?
Meters (m)
How many significant figures are in 0.00430?
3 sig figs
Where is the emergency shower located?
The back corner.
What is the difference between accuracy and precision?
Accuracy is how close a value is to the true or accepted value.
Precision is how close the values are to each other.
Items that remain the same throughout the entire experiment.
Constants
What is the SI unit for temperature?
Kelvin (K)
How many significant figures are in 52.800?
5 sig figs
TRUE or FALSE: You pour out too much of a chemical into your flask. You should return it to the original container to minimize waste.
FALSE this leads to contamination!
Find the density of a material that has a mass of 5.03 g and occupies 3.24 mL.
1.55 g/mL
The one variable that you change, this variable is the one being tested.
Independent variable
How many grams are in 772 mg?
0.772 g
Round 68.029 to three significant figures.
68.0
TRUE or FALSE: Skimming over lab instructions is fine, you can probably wing it.
FALSE do not wing it!
What is the mass of a sample that has a density of 6.72 g/cm^3 and a volume of 55.1 cm^3?
3.70 x 10^2 g (370 g)
The variable in an experiment that has a known outcome and is used for comparison.
Control
What is 92.25 m in kilometers?
0.09225 km
Round 52.8005 to five significant figures.
52.801
TRUE or FALSE: While using the hot plate, you get a little burn on your finger. You have survived burns much worse, so you don’t need to bother telling the teacher.
FALSE, tell the teacher!
A sample substance has a density of 0.824 g/mL and a mass of 0.451 g. Calculate the volume.
0.547 mL
What is the format of a experimental design title?
The effect of independent variable on dependent variable.
88 km to dm.
88000 dm
Round your answer to the correct number of significant figures.
56.0032/7.54 =
7.43
What if you break glass?
Tell the teacher, do not clean it up!
What is the volume, in cubic centimeters, of a 0.715 kg sample of gold. Gold's density is 19.3 g/cm^3.
37.0 cm^3
Identify the different types of variables (control, IV, DV, constants) in the following:
Jerry's experiment is about worm attraction to different foods. He is testing popcorn, strawberries, butter, ground beef, and soy sauce. Water is also used.
Control: water
IV: types of foods
DV:#of worms who eat
Constants: amount of food, time of day, placement of food