Significant Figures or Scientific Notation
Convert 0.003500 mm to scientific notation.
3.500 x 10-3 mm
The definition of chemistry is ____________.
the study of matter and its changes.
What temperature unit do we use in chemistry?
Degrees Celsius
1 g = _____ mg
1000 mg
How many significant figures in the number 10.440 g?
5 sig figs
Put 9.57776 x 104 in normal notation
95,777.6
The value you obtain in lab or calculations
observed or measured value
When measuring liquid in the lab, this piece of lab equipment is the most accurate.
graduated cylinder
0.45 km = _______ m
4.5 x 104 m
45,000 m
What is the density equation?
D=m/v
The number of significant figures in 0.003090 mL and the different type of zeros found in the number.
4 significant figures
0.003090 = leading zeros (never significant)
0.003090 = captive zeros (always significant)
0.003090 = trailing zeros (only significant when there is a decimal in the number)
How close the measured value is to the accepted true value
Accuracy
A measurement that includes 3 significant figures includes ____ certain digits and ____ estimated digits
2 certain digits and 1 estimated digit
Using 1 kg = 2.2 lbs, convert 6.90 kg to lbs.
15.2 lbs
Change 295,934 into scientific notation.
2.95934 x 105
Solve 25.6 - 3.647
22.0
Significant figures definition is...
All the certain digits and one estimated digit in a measurement
If the measurement of a baking sheet is 20.20 cm:
a) How many significant figures in the measurement?
b) What is the uncertain or estimated digit?
a) 4 significant figures
b) The last 0 is the uncertain/estimated digit.
48 mg -> g
0.048 g
If you add 88.4 + 4.932, how many significant figures will be in your answer?
Answer = 93.3
Sig figs = 3
Solve (6.02 x 1023) x (9.603 x 10-9)
5.78 x 1015
Lydia goes bowling with her friends. Her goal is to score at least 9 pins in every frame. In the first three frames, she knocks down 9 pins, 10 pins, and 8 pins. Was she accurate and/or precise?
She was both accurate and precise. The average of her three frames was 9 and she was within +/- 1 pin of each attempt.
Roger measures 230 mL of water. The graduated cylinder measures to the ______ place. (place value)
hundreds
Given 3 zorks = 1.5 bums, 1 bum = 5 toots, 2 toots = 3 spuds
Convert 1.7 zorks to spuds.
6.4 spuds
If a 330g piece of iron has a density of 1.248 g/cm3, what is the volume?
v = 260 cm3