Student Name:___________________________________
1) Scientific Method practice # 1
1) Use your imagination or examples from everyday life to come up with a problem and then
use scientific method model to solve it.
1)
Problem
_______________________________________________________________
_____________________________________________________________
2)
Hypothesis( use: if , then, because statement)
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
3)
Experiments/Data
Control__________________________________________________________
_______________________________________________________________
Variable_________________________________________________________
_______________________________________________________________
_______________________________________________________________
4)
Conclusion________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
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Student Name:___________________________________
2) Measurement practice #2
1) For each of the following, please state what place a measurement must be made to given the
calibration points on a measuring device:
If a device is marked to the Then estimate your
nearest…
answer to the nearest…
Hundredth
Ten
Tenth
Hundred
2) For each of the following, record the measurement, the number of significant figures and the
precision of the measurement. Use the appropriate units.
Examples
Calibration
Precision
Reading
(measurements)
# of Sig
Figs in the
reading
2
3) For each of the following numbers, determine) how many significant figures are in the measurement.
Measurement # SF
Measurement
2347 cm
12556 cm
4
23405 kg
34.780 mL
63.908 mg
56.0600 mm
3400. cm
560 km
9700 mL
37000 kJ
0.00023 dg
0.000230 dg
1.00230 dg
34.000 cL
# SF
NOTE Significant figures are used for measurements only. Any zero that is not "Significant" is still there as a place
holder.
_
EXAMPLE: 560000 <- place-holding zeroes in the tenths and units place
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Student Name:___________________________________ Grades: _____, _____, _____, _____, _____, _____
3) Rounding practice # 3
Be sure to consider the number of significant figures in each of the following problems. For this
exercise, consider all numbers to be measurements. Include the units in your answers. Write the
UNROUNDED answer first, then the ROUNDED answer, drawing a box around your rounded answer.
B) ADDITION
Problem
Unrounded Answer
Rounded Answer, with
units
Unrounded Answer
Rounded Answer, with
units
Unrounded Answer
Rounded Answer, with
units
4.732 cm +
16.8 cm +
0.781 cm
32.0 MW +
0.0059 MW
C) SUBTRACTION
Problem
22.95 mg –
6.4 mg
33.728 cL –
1.323 cL
D) MULTIPLICATION/DIVISION
Problem
37.66 KW X 2.2 h =
14.922 cm X 2.0 cm =
98.11 kg X 200 m =
19.82 g / 24.2 km =
4
F) OK, here is a practical problem in which you will combine all of your skills. The equation you will use
is
D = m/v (density = mass / volume). Remember to show a proper numerical setup (with units) and
solve, making sure your final answer is properly rounded for the type of math you did:
1) A ring, supposedly made of pure silver (Ag) has a mass of 20.445 grams. When its volume is taken
by water displacement, it is found to have a volume of 1.95 mL. Calculate the density of the ring:
2) Based on the actual density of silver (Ag) found on Reference Table S, could this ring actually be
made out of silver? Briefly explain your answer:
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Student Name:___________________________________
4) Scientific Notation practice # 4
A) Convert each of the following into scientific notation:
Number
250.
Scientific Notation
1000
200 000
2100.
0.010
0.000 55
0.0070
0.0205
0.000 000 000 000 000 000 160
B) Convert each of the following into standard decimal notation:
Scientific Notation
3.56 X 103
7.982 X 1011
8.3400 X 1015
7.02 X 10-4
6.6 X 1034
Standard Decimal Notation
C) Ksp is a measurement of the solubility of a salt. The larger the value of Ksp is, the more salt can
dissolve in water.
Which of the following Ksp values(on the bottom of the page) would indicate the salt with the highest
solubility?
Provide your answer here____________________________________________
Which of the following Ksp values(on the bottom of the page) would indicate the salt with the lowest
solubility?
Provide your answer here____________________________________________
Given values
a) 4.3 X 10-6
b) 5.7 X 10-7
c) 9.8 X 10-8
d) 3.2 x 10-9
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Student Name:___________________________________ Grades: _____, _____, _____, _____, _____, _____
5) Conversion practice # 5
A) Perform the following conversions, showing all work and units. For the first one, I give you places
to fill in the preliminary information. For the rest, provide it yourself:
1) A black widow spider is found to have a mass of 0.90 grams. How many kg does this spider weigh?
Conversion Factor:___________________________
2) A friend of yours just drank 1460 milliliters of water. How many L of water is this?
Conversion Factor:_____________________________________
3) How many millimeters would you have run if you ran 0.8051 kilometers?
Conversion Factor:________________________________________
4) A snail is observed to move 8.32 cm in one minute. How many mm did the snail travel?
Conversion Factor:________________________________
5) The atomic radius of an atom is 37 pm. How many meters is that?
Conversion Factor:_____________________________________
6)
The average weight of a 16th year old is 50 kilograms how many milligrams is this?
7) The time machine needs 1.21 Giga ( 109 ) watt of power to travel through time. How many
centiwatts of power is that?
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