Intro to Sig-Figs
The first rule of Significant Figures is that all non-zero numbers are significant, and any zeroes appearing in between non-zero numbers are SIGNIFICANT!
If this is true, how many significant figures are there in 5,008?
Four!
The 5 and 8 are non-zero numbers (meaning they are significant), so the zeroes in between are also significant!
How do we know if a measurement is accurate?
What is 543 in scientific notation?
5.43 x 102
What is the prefix with an abbreviation of k (e.g. kg)
Kilogram
In the lab, do you wear proper lab attire or PPE?
Proper lab attire
The second rule of Significant figures is that all zeroes to the left of the first non-zero digit is NOT significant.
If this is true, how many significant figures are in 0.0054?
Two!
The 5 and the 4 are significant because they are non-zero numbers, but the zeroes occuring before them are in front of all other non-zero digits, making them not significant.
The accepted weight of my dog is 50 lbs. I place him on a scale 3 times. The scale tells me he weights 45.0, 44.9, and 45.1 pounds. Are my measurements precise?
Yes (but not accurate!)
What is 3.641 x 104
36410
Which metric prefix has a scientific notation 109?
Giga
What do you do if you spill an acid on your skin?
Rinse with water (at the safety shower)
The third rule is that any zeroes occuring after a decimal point are significant (or they would be omitted!)
If this is true, how many significant figures are in 185.00?
Five!
All digits to the left of the decimal are significant, and the zeroes follow a decimal place, making them significant as well!
I'm throwing darts. I hit the bullseye three times in a row. Are my throws accurate? Are they precise?
They are precise and accurate
When you multiply in scientific notation, what do you do with the exponents?
Add them
Which metric prefix has the scientific notation of 10-1?
deci
List proper lab attire
Long pants, closed toed shoes, goggles, aprons, and hair pulled back (to get the correct answer, list at least 2)
When adding or subtracting with significant figures, whichever number given in the problem that has the FEWEST numbers to the RIGHT of the decimal will be the amount of numbers to the right of the decimal in your answer.
If this is true, if you have 5.4 L of water and you remove 0.21 L from the bucket, how many liters do you have left?
5.1 L!! The 5.4 L has only one digit to the right of the decimal, so your answer will only have one digit to the right of the decimal as well.
The accepted density of diamond is 3.51 g/cm3 . I have a big diamond ring. I calculate the diamond's density as 1.2 g/cm3, 2.5 g/cm3, and 3.0 g/cm3. Are my measurements are precise? Are my measurement accurate?
Neither accurate or precise
What is (5.31 x 102) x (3.14 x 103)?
1.667 x 106
10-12
How do you dilute an acid? (i.e., in which order do you pour acid and water)
Pour acid into water. NEVER water into an acid
When multiplying or dividing with significant figures, you answer should have the same amount of significant figures as the number with LEAST amount of significant figures.
Using this rule, what is the answer to 5.0 x 3.21 (with the proper amount of significant figures?
16.1
Which is the more precise set of measurements:
Set 1:
54.2, 55.0, 53.0
Set 2:
20.1, 20.3, 20.2
Set 2
What is (5.43 x 103) / (2.1 x 101)
2.6 x 102
c has what prefix name and scientific notation?
prefix name: centi, scientific notation: 10-2
List lab safety equipment (i.e. the equipment you would use in an emergency and/or accident)
safety shower, fire blanket, first aid kit, sharps disposal, eye wash station