Measurement
Density
Scientific Notation
Sig Figs
Calculations
100
The statement, “there are 40 desks in the class.” Is an example of this.
What is quantitative measurement
100
The formula for density
What is mass/volume
100
In the number 5.60 x 10^3 , these digits make up the coefficient.
What is 5.60
100
non zero numbers like 3 and 6 are __________ significant. (always, never, or sometimes)
What is always
100
m = 10.0g v = 5.0ml D = ? (with correct sig figs)
What is D = M/V D= 10.0g/5.0ml D = 2.0 g/ml
200
This is an example of a qualitative measurement
What is (any kind of descriptive observation using words, ex: the room is cold)
200
Density is this kind of property, because it does not depend on the size of the sample
What is intensive property
200
The coefficient must be between these numbers
what is 1 and 9.99999...
200
Zeros in these places are not significant. Give one example for each
What is in front of a number (0.00005) and at the end of a number if there is no decimal (400)
200
You open a can that contains 354.88ml of pop and pour it into a graduated cylinder that reads 352.5ml. a) identify the actual and experimental values b) calculate the error c) calculate the % error
actual = 354.88ml experimental = 352.5ml error = 2.38ml % error = 0.67%
300
The closeness of a measurement to its true value is a measure of this
what is accuracy
300
The SI units for density
What is g/ml OR g/cm^3
300
convert 0.0004 to scientific notation
What is 4 x 10^-4
300
0.002130g has this many sig figs.
What is 4 sig figs
300
6.23 x 10^4 m^2 ÷ 4.2 x 10^2 m = in sci not with correct sig figs and units
148.33 ---> 1.5 x 10^2 m
400
The precision of measurements depends on this
What is the skill of the scientist
400
The reason a helium balloon floats in the air
What is helium gas is less dense than air
400
Convert 3.840 x 10^4 to standard notation
38400
400
4.508 x 10^-2 rounded to 3 significant figures is
What is 4.51 x 10^-2
400
37.2ml + 18.00ml + 38ml = in sci not with correct sig figs and units
What is 93.2 ---> 9.3 x 10^1 ml
500
A weight known to be 10.0g is measured several times using the same balance and every time the balance reads 8.7g. Describe the accuracy and precision of the measurements.
What is precise but not accurate
500
The equation for mass
What is volume x density
500
Convert 7895002 to scientific notation with 3 sig figs
7.90 x 10^6
500
7438.026 rounded to 3 significant figures and put in scientific notation is:
7.44 x 10^3
500
A metal block is 1.2 cm x 3.2 cm x 6.2 cm. The density of the cube is 7.26 g/cm3. a) identify the knowns and unknowns b) how much space does the block take up? c) what is the mass of the block?
known= density, length, width, height unknown = volume, mass b) volume = space something takes up volume = length x width x height volume = 1.2cm x 3.2cm x 6.2cm = 23.808 cm^3 2 sig figs = 24 cm ^3 c) m = d x v m = 7.26 g/cm^3 x 23.808 cm^3 m = 172.84 g m = 2 sig figs = 170 g OR 1.7 x 10^2 g
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