Chemistry In Focus
7th Edition
ISBN: 9781337399692
Author: Tro, Nivaldo J.
Publisher: Cengage Learning,
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Chapter 2, Problem 12E
Identify the decimal part, the exponential part, and the exponent of the number
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An electric current of 52.0 mA flows for 6,0 seconds. Calculate the amount of electric charge transported.
Be sure your answer has the correct unit symbol and 2 significant digits.
0
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A researcher would like to determine whether there is any relationship between students’ grades and where they choose to sit in the classroom. Specifically, the researcher suspects that the better students choose to sit in the front of the room. To test this hypothesis, the researcher asks her colleagues to help identify a sample of n = 100 students who all sit in the front row in at least one class. At the end of the semester, the grades are obtained for these students and the average grade point average is M = 3.25. For the same semester, the average grade point average for the entire college is μ = 2.95 with σ = 1.10. Use a two-tailed test with α = .01 to determine whether students who sit in the front of the classroom have significantly different grade point averages than other students.NOTICE that you are asked to use α = .01!
A) sig., p<.01
B) N.S. ("not significant"), p>.01
C) sig., p>.01
D) N.S., p<.01
Evaluate
6×0.222×7.0
and round the answer appropriately.
Express your answer numerically using the appropriate number of significant figures.
Part B
Evaluate
0.411+9.9+0.8
and round the answer appropriately.
Express your answer numerically using the appropriate number of decimal places.
Part C
Evaluate
16.83 over 15 −0.46
and round the answer appropriately.
Express your answer numerically using the appropriate number of significant figures or decimal places.
Chapter 2 Solutions
Chemistry In Focus
Ch. 2 - The volume of a liquid can be measured with a...Ch. 2 - Scientific Notation Express the number 0.0000023...Ch. 2 - Prob. 2SCCh. 2 - Prob. 3SCCh. 2 - Converting Between Units Convert 34.0 cm to...Ch. 2 - Prob. 2.3YTCh. 2 - Extracting Information from Graphical Data The...Ch. 2 - Solving Word Problems...Ch. 2 - Solving Word Problems Involving Units Raised to a...Ch. 2 - Prob. 2.7YT
Ch. 2 - Prob. 2.8YTCh. 2 - Without doing any calculations, determine whether...Ch. 2 - Prob. 1ECh. 2 - Prob. 2ECh. 2 - Prob. 3ECh. 2 - What is the difference between reporting the...Ch. 2 - Prob. 5ECh. 2 - Prob. 6ECh. 2 - Prob. 7ECh. 2 - Prob. 8ECh. 2 - Prob. 9ECh. 2 - What is a conversion factor? Give two examples of...Ch. 2 - Prob. 11ECh. 2 - Identify the decimal part, the exponential part,...Ch. 2 - What is density? Give two examples of possible...Ch. 2 - Since oil floats on water, what can you say about...Ch. 2 - Express each of the following in scientific...Ch. 2 - Express each of the following numbers in...Ch. 2 - Express each of the following in decimal notation:...Ch. 2 - Express each of the following in decimal notation:...Ch. 2 - The circumference of Earth at the equator is...Ch. 2 - The distance from New York to Los Angeles is 2777...Ch. 2 - A can of soda contains 12 fluid ounces. What is...Ch. 2 - A laboratory beaker can hold 150mL. How many fluid...Ch. 2 - A car has a fuel efficiency of 27 miles per...Ch. 2 - A European rental car can travel 17 km on a liter...Ch. 2 - Perform each of the following conversions within...Ch. 2 - Perform each of the following conversions within...Ch. 2 - Prob. 27ECh. 2 - Perform the following conversions between the...Ch. 2 - A pond has a surface area of 1552m2. Convert this...Ch. 2 - An orange has a volume of 54cm3. Convert this...Ch. 2 - Prob. 31ECh. 2 - Prob. 32ECh. 2 - A runner runs at a pace of 8.5 minutes per mile....Ch. 2 - A driver drives an average speed of 58 miles per...Ch. 2 - A sports utility vehicle gets 12 miles per gallon...Ch. 2 - A hybrid electric vehicle (HEV) is a car with both...Ch. 2 - The following graph shows the concentration of an...Ch. 2 - The following graph shows the historical...Ch. 2 - A 28.4-cm3 sample of titanium has a mass of...Ch. 2 - A 1.5-cm3 sample of silicon has a mass of 3.5 g....Ch. 2 - A 5.00-L sample of pure glycerol has a mass of...Ch. 2 - A 3.80-mL sample of mercury has a mass of 51.4g....Ch. 2 - Ethylene glycol (antifreeze) has a density of...Ch. 2 - A thief plans to steal a bar of gold from a womans...Ch. 2 - Prob. 45ECh. 2 - A proton has a radius of approximately 110-13 cm...Ch. 2 - What did Einstein mean when he said, The most...Ch. 2 - Prob. 48ECh. 2 - Prob. 49ECh. 2 - Prob. 50ECh. 2 - Prob. 51ECh. 2 - Consider each of the following balances. Which one...Ch. 2 - Each of the following coins is photographed to...Ch. 2 - Obtain an outdoor thermometer and record the...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- I am told that when determining the number of significant figures, if the decimal place is absent, then you start counting from the first nonzero number on the right side and continue counting to the left until you reach the last digit. However, if the decimal place is present, start counting the first nonzero number from the left and continue counting to the right until the final digit has been reached. For example, the number 50 only has two significant figures, while the number 50.00 has four significant figures. However, how does the number 50 have two significant figures? If I have to start countingfrom the right because of the absence of a decimal place, and I have to begin with the first non zero number, I would have to start from 5 and there is nowhere to count further to the left. How does the number 50 have two significant figures?arrow_forwardFind the radius (r) of an aluminum cylinder that is 2.00 cm long and has a mass of 12.4 g. For a cylinder V=πr^2larrow_forwardI don't understand the wording. The least significant digit means the last digit? 7.700 X 2.1 = 16.17 would the uncertainty be 0.01 ? 2.132 + 17 + 4.04 = 23.172 would the uncertainty be 0.001 ?arrow_forward
- Calculate the time taken in minutes for light from the sun to reach the earth. The sun is 93 million miles away. (1 mile = 1.60934 km) and the speed of light is 3.00 x 10^8 meters per second.arrow_forwardWhat is the percentage uncertainty with the following measurement 0.100 ± 0.005 g? Provide your answer to one decimal point.arrow_forwardWhat is the result of the following calculation to the correctnumber of significant figures?(6.266 − 6.261) ÷ 522.0 = a) 9.5785 × 10–6b) 9.579 × 10–6c) 9.58 × 10–6d) 9.6 × 10–6e) 1 × 10–5arrow_forward
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