# Chem Sapling HW R

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question
Write the following numbers in scientific notation. a) 1061 b) 0.00081
a) 1.061 x 10^3 b) 8.1 x 10^-4
question
Write the following numbers in standard orientation, maintaining the same number of significant figures. a) 6.104 x 10^2 b) 9.5 x 10^-3
a) 610.4 b) .0095
question
Arrange these values according to magnitude. 7.5 x 10^-6 3.6 x 10^-2 2.4 x 10^5 9.0 x 10^-6 6.1 x 10^4
Greatest to Least 2.4 x 10^5 6.1 x 10^4 3.6 x 10^-2 9.0 x 10^-6 7.5 x 10^-6
question
Identify the power of ten that defines each of these prefixes. nano- kilo- centi- micro- milli- mega-
nano- 10^-9 kilo- 10^3 centi- 10^-2 micro- 10^-6 milli- 10^-3 mega- 1-^6
question
Classify each phrase about weight and mass as true or false. mass and weight are the same thing mass and weight both depend on gravity your mass on the moon is the same as your mass on the Earth your weight on the moon is the same as your weight on the Earth
True: your mass on the moon is the same as your mass on the Earth False: mass and weight are the same thing your weight on the moon is the same as your weight on the Earth mass and weight both depend on gravity
question
Several groups of students are attempting to determine the density of a lead weight by various methods. Their data is shown here. Gr1 Gr2 Gr3 Measured Trial 1 11.5 11.5 10.9 Densities Trial 2 11.3 11.4 11.3 (g/mol) Trial 3 11.1 11.4 11.1 Av. Density 11.3 11.4 11.1 The density of lead is listed as 11.3 g/mol Which group was more accurate? Which group was most precise?
most accurate: Group 1 most precise: Group 2
question
Identify the number of significant figures in each of these values 702.50 80.30 0.020 11020 0.006 2000 67000
1 sig fig: 2000, 0.006 2 sig figs: 6700, 0.020 3 sig figs: none 4 sig figs: 80.30, 11020 5 sig figs: 702.50
question
Round each number to three significant figures. a) 0.036549 b) 1044.987 c) 4.0007
a) .0365 b) .1040 c) 4.00
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To what decimal place should each answer be rounded? How many significant figures does the rounded answer have? a) 9cm + 2.8cm = 11.8 cm b) 0.135atm + 0.6atm = 0.735atm
After rounding the number should be reported to the a) ones place b) tenths place and thus has: a) 2 significant figures b) 1 significant figure
question
0.00245m = ? pm
2450000000
question
Convert 8.32 um to inches.
.000328 in
question
Your computer monitor has a width of 13.97 inches and a height of 10.48 inches. What is the area of the monitor display in square meters? How many significant figures should there be in your answer?
Area=.0945 m^2 4 significant figures
question
The surface temperature on Venus may approach 747 K. What is this temperature in degrees Celsius? The temperature on Mercury may drop to -271 degrees Fahrenheit at night. What is this temperature in degrees Celsius?