Lab Safety
Cannot have any of this in a lab
What are foods and drinks?
kickstarts a scientific investigation (1st step)
What is an observation?
leading __ are not significant; ending ___ are not significant UNLESS there is a decimal and a number somewhere in front
What are zeros?
the average compared to the true/correct value
What is accuracy?
Convert to scientific notation
1,000,000
What is 1 x 106?
safety gear to be worn for every lab
What are lab aprons and goggles?
the "normal" to which all results are compared (does NOT receive treatment)
What is the control?
the answer with the correct number of sig figs
0.0100 / 0.0050
2.0
the difference between the smallest value and the largest value; the closer to zero, the better... determines precision
What is range?
Convert to standard form
2.33 x 10-6
What is 0.00000233?
Use if substance gets in eye
What is the emergency eyewash station?
must be completed before forming an EDUCATED hypothesis
the number of sig figs in 00510.00100 x 10-23
What is 8?
Accuracy of this experiment
True/correct value: 23
Trials: 23, 22, 21, 23, 23, 22
What is high accuracy?
Convert 153 Kg to mg
What is 153,000,000?
This person cleans the lab station
Who is the student?
The dependent variable is observed and depends on
What is the independent variable?
the answer with the correct number of sig figs
1.21 + 1.2039 + 3.210 + 0.1+0.100
What is 5.8?
Precision of this experiment
True/correct value: 32
Trials: 89, 90, 88, 89, 91, 89, 89
What is high precision?
Convert 386 mV to DV
What is 0.0386?
use for hot glassware
What are mittens/tongs?
He is testing the flower bunches to see if birds approach. One set has worms, one set has bread crumbs, one set has pebbles, one set has nothing. Name the independent variable.
What are the worms, bread crumbs, and pebbles?
the answer with 4 significant digits
321.050 x 5,587,651,000
What is 1.794 x 1012?
the validity of the this experiment; accuracy/precision
Target value: 60
Trials:50, 90, 81, 20
Accurate, not precise
NOT VALID
Convert 87 A to mA with 1 sig fig
What is 9 x 104?