Always show complete solutions for every number. All inquiries must be referred to the instructor only. Answer the problems chronologically and systematically. Deductions will be given for those who do not know how to follow procedures. Cheating is not tolerated and an automatic grade of 5.0 will be given to those who will be caught.

A. SIGNIFICANT FIGURES (10 pts.)
(Show the actual results first before rounding off the digits into their proper significant figures.)

A.1. Determine the number of significant figures in each numerical value below. (Assume all values are measurements.) 1. 357 ml
2. 1.0600 L
3. 0.000 501 g
4. 23, 000 tons
5. 1.8000 X 105 mi

A.2. Perform the following arithmetic operations and express the answer to the correct number of significant figures

C. DENSITY and SPECIFIC GRAVITY (20 pts.)
(Observe proper Significant Figures in the answer)

1. Calculate the mass in grams of 15.0ml of a saline solution that has a density 1.05 g/ml 2. Copper has a density of 8.96 g/ml. Calculate the volume occupied by 125.0 g of copper. 3. A. If the density of a liquid is 0.80 g/ml, what is its specific gravity? B. If the specific gravity of a substance is 2.3, what is its density?

D. TEMPERATURE (30 pts.)
(Observe proper Significant Figures in the answer)

Make the temperature conversions as indicated by the blanks in the following table...

...example of physical change?
A. The rusting of an iron nail
B. The burning of propane in a gas grill
C. Baking cookies
D. Polishing tarnished silver
E. Melting of an ice cube in a glass of soda
3. Which measurement has the fewest number of significantfigures?
A. 12.80 m
B. 0.1280 m
C. 0.001280 m
D. 1280 m
4. Which quantity is an exact number?
A. 3 cars
B. 1,000 m
C. 2 L
D. 453.6 g
5. The number 0.0035880 expressed correctly using...

...on significantfigures
When we use an equipment to take measurement, it is important to be honest when reporting a measurement, so that it does not appear to be more accurate than the equipment used to make the measurement allows. To achieve this, we can control the number of significantfigures used to report the measurement.
When we look at a number, its first significantfigure is the first digit...

...SignificantFigures in Measurement and Calculations
A successful chemistry student habitually labels all numbers, because the unit is important. Also of great
importance is the number itself. Any number used in a calculation should contain only figures that are
considered reliable; otherwise, time and effort are wasted. Figures that are considered reliable are called
significantfigures . Chemical...

...unit
b) the ratio, by number, of C atoms to H atoms to 3 significantfigures
c) the ratio, by mass, of Ge to S to 3 significantfigures
d) the number of g S in 1 mol of the compound to 3 significantfigures
e) the number of C atoms in 33.10 g of the compound
5)
Determine the mass % O in the mineral malachite, Cu 2 (OH) 2CO3 .
6)
Determine the mass % H2O in the hydrate Cr(NO3 )3 ⋅ 9H 2O ....

...allegedly authoritative number.
Significantfigures
Whenever you make a measurement, the number of meaningful digits that you write down implies the error in the measurement. For example if you say that the length of an object is 0.428 m, you imply an uncertainty of about 0.001 m. To record this measurement as either 0.4 or 0.42819667 would imply that you only know it to 0.1 m in the first case or to 0.00000001 m in the second. You should only report as many...

...SignificantFigure Rules
Significantfigure rules are really "rules of thumb" for how to handle the results of calculations so as
not to introduce or lose precision in performing a mathematical operation. These rules are not always
correct for all situations. However, in most cases, following the significantfigure rules will yield a
good result.
Rules concerning zero
A zero between two...

...glassware (beakers, burettes, pipettes, graduated cylinders, flasks, etc) should be used in various
circumstances.
2. Know how to “correctly” measure volume and mass (weight).
3. Become familiar with significantfigures and its relationship to measurements and data recording (significantfigures).
4. Become familiar with the errors, precision and accuracy associated the various measurement tools and techniques.
5. Determine the...

...c. 2.5x 10-9 nm3 = d. 30.5 cm/s = e. 9.6 ng/mm2 =
4.
Mm (Ans. 6.523 x 10-19) mm3 (Ans. 2.5 x 10-27) km/h (Ans. 1.09 x 106) kg/m2 (Ans. 9.6 x 10-6)
Perform the following calculations and report each answer with the correct number of significantfigures and units. b. 2.457 m x 1.2 m x 2.45 m d. 3.6050 cm x (24.10 cm - 23.10 cm)
a. 3.45 m – 3.4 m c. (50.214 g – 49.93 g) x 1.224 cm / 55.22 cm3 e. 4.0 x 102 cm – 3 cm
f.
2.7612g 2.7601g
2.20cm 3
g...

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