1) The numbers, 1.004 and 1.20, have (a) 4 and 3 and significant figures respect
ID: 567519 • Letter: 1
Question
1) The numbers, 1.004 and 1.20, have (a) 4 and 3 and significant figures respectively. (b) 4 and 2 2 and 4 (d) 1 and 2 2) The width, length, and height of a large, custom-made shipping crate are 1.22 m, 3.22 m, and 0.830 m, respectively. The volume (in m3) of the box using the correct number of significant figures is; (a) 3.2606 b) 3.26 (c) 3.3 (d) 3.261 3) How many significant figures should be recorded for the result of the calculation 3.91 +7.21 0.3128 (b) 4 (c) 3 (d) 2 4) Express the number 0.0610 in scientific notation (a) 0.61 x 103 (b) 6.10 x 102 (c) 610 x 104 (d) 0.61 x 10 A sample of manganese and a sample of chromium have the same mass. The density of chromium is less than that of manganese. Which statement is true; (a) The chromium sample has a larger volume (b) The manganese sample has a larger volume (c) The two samples have the same volume (d) The relative volumes cannot be predicted unless a specific shape is provided 5) Calculate the density of diethyl ether if 100 cm2 weighs 80 g. Would it float or sink in water? (Density of water 6) 1 g/cm3) (d) 1.25, float (a) 0.8, Sink (b) 0.8, float(c) 1.25, sink You have a perfect cube of titanium that has sides with a length of 4.15 cm. The density of titanium is 4.51g/cm3. What is the mass (in g) of this cube? (a) 18.7(b) 322 7) (c) 0.92 (d) 1.09 of lead submerged in the water brings the total volume to 60.0cm2 and the mass of the cylinder and contents to 80.0g. What is the density of lead in g/cm2 (a) 1.00 8) An empty graduated cylinder weighs 40.0g and is filled with 40.0 cm2 of water. A piece (d) 4.00 (c) 3.00 (b) 2.00Explanation / Answer
1) A) 4 & 3
here are three rules on determining how many significant figures are in a number:
1.Non-zero digits are always significant.
2.Any zeros between two significant digits are significant.
3.A final zero or trailing zeros in the decimal portion ONLY are significant.
2)volume=1.22X3.22X0.83=3.26057=3.2606
3)5 because the denominator has 5 digit.
4)b)
5)a) as the density has inversely poportional to volume.greater density lower volume.
6)density=m/V=80/100=0.8g/cc<1,so it floats.
7)mass=densityXvolume=4.51X4.153=322
8)weight and volume of empty cylinder is 40g and 40 cc.
mass of lead=(80-40)=40g
volume of the lead=(60-40)=20cc
density=40/20=2g/cc
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