Accuracy/Precision
I can calculate that
Scientific Notation
Sig Figs
Prefixes
100
A student hits the bullseye three times in a row.
What is accuracy and precision?
100
As the temperature of an object decreases, what happens to the density?
Density increases
Colder objects have smaller volumes as particles move closer together.
100
Express in scientific notation
0.000 004
4x10-6
100
How many sig figs?
10,240
4
100
How many milligrams are in a gram?
1000 milligrams in a gram.
200
An unknown mass is placed on 3 scales, all three read 200.2g
What is precision?
200
Calculate the density of an object with a volume of 24.0cm3 and a mass of 42.0g.
d=m/v
42.0g/24.0cm3 = 1.75 g/cm3
200
Express in scientific notation
65536
(Don't round)
6.5536 x 104
200
How many sig figs?
200
1
200
What is the symbol for micro?
300
Explain the difference between precision and accuracy.
Accuracy - how close the measurement is to the actual value
precision - the consistency of measurements.
300
The mass of a piece of lead is 13.0 grams. The density of lead is 11.35g/cm3
d = m/v
v= m/d
v= 13.0/11.35
v = 1.15 cm3
300
Convert from scientific notation.
7.24 x 10-2
.0724
300
How many sig figs?
0.000 009
1
300
What is the power of 10 for nano?
10-9
400
A known mass of 300.0 grams is placed on the scale three times. Measurements of the mass are 314.0, 314.0 and 314.1 grams.
What is precise but not accurate
400
Student has a bag of candy. On the package is written 350.0 grams. The student masses the candy and determines it to be 367.0 g. Calculate percent error.
What is 4.86% ?
400
Perform the following calculation (present in sig fig)
(1.587 x 10-4)-(1.6x10-6)
1.571x10-4
When you move the decimal over for the 10-6, you get three decimals!
400
Perform these calculations using sig figs properly.
2588 +12.35
2600.
400
What does "M" stand for?
mega, 106
500
A- neither accurate nor precise
B - precision, not accuracy
C - neither accurate nor precise
D - precision and accuracy
500
The density of copper is 8.92 g/cm3.If it has a volume of 25.0cm3, what is the mass (g)?
(v)d=m/v(v)
m=d(v)
8.92(25.0) = 223 g
500
Scientific notation is based on the fact that.....
Every number can be expressed as a number between 1 and 10 multiplied by a power of 10.
500
Perform calculation, using sig figs properly
3.436 / 1.28
3.436 / 1.28 = 2.68
500
How many milligrams are in one kilogram?
1,000,000 (one million) milligrams in a kilogram