chemistry #4

due by 01/30 Monday

Module 4 Assignment: (Pages 104-108) Complete only the numbers listed below, and submit your answers here by Tuesday, 11:55PM

· Exercise Questions: 1, 5

· Problems: 17, 19, 21, 27, 31, 39, 47, 51, 53

· Feature Problems and Projects: 62, 63

(See example for format)


Have you ever heard of the term “Superfund Site”? This is something you definitely have to know! Go to the following website of the US Environmental Protection Agency, and answer the following questions.

US EPA Superfund Sites:

Links to an external site.

Go to this searchable site and see if there’s any environmental hazard site around your place of interest:

Links to an external site.

What is Superfund?

Which of the site in southern California are you most concern about? (Or if you’d like to checkout Superfund sites near your hometown, you may also do so.

When was the contamination first detected?

What’s the original source of contamination? (i.e. who did it?)

What was the contaminated media? (ex: groundwater, soil, sludge, air…etc)

What was the contaminant(s)? (ex: trichloroethylene, tetrachloroethylene…and other chemicals)

How are they remediating the site? (clean-up activities)

What’s the clear-up result & date?

Exercise Questions:
4. What is the difference between reporting the quantity nine inches as 9 inches and 9.00
When the measurement is expressed in 9 inches, it may be rounded from any number
between 8.5 and 9.4. However, when the measurement is expressed in 9.00 inches, it
indicates that 9 is a number accurate to two decimal places, rather than rounded.
Even so, we can’t tell if 9 inches is a integer, because 9.003 isn’t ruled out.

13. What is density? Give two examples of possible units for density.
Density is the ratio of an object’s mass to its volume. Gram and kilogram.

15. Express each of the following in scientific notation:
a. 0.000851 g 8.51 x 10-4

b. 38,041,430 (population of California) 3.8 x 107

c. 299,790,000 m/s (speed of light) 3.0 x 108

d. 313,914,040 (U.S. population) 3.1 x 108

17. Express each of the following in decimal notation:
a. 149 x 106 km (average distance between Earth and the Sun) 149,000,000 km
b. 7.9 x 10-11 m (radius of a hydrogen atom) 0.000000000079 m
c. 4.54 x 109 yr (age of Earth) 4,540,000,000 yr
d. 6.4 x 106 m (radius of Earth) 6,400,000 m

19. The circumference of Earth at the equator is 40,075 km. Convert this distance into each
of the following units:
a. meters 40,075,000 m
b. miles 24,901.5 miles
c. feet 131,479,658.8 feet

23. A car has a fuel efficiency of 27 miles per gallon. What is its efficiency in kilometers per
43.4 km/gallon

25. Perform each of the following conversions within the metric system:
a. 4332 mm to m 4.332 m
b. 1.76 kg to g 1,760 g
c. 4619 mg to kg 0.004619 kg
d. 0.0117 L to mL 11.7 ml

37. The following graph shows the concentration of an atmospheric pollutant, carbon
monoxide, for the period 1990–2015. As shown by this graph, carbon monoxide levels have
decreased in the atmosphere because of mandatory reductions legislated by the Clean Air
a. What is the total decrease in carbon monoxide over this period? 6.1 – 1.5 = 4.6 ppm
b. What is the average yearly decrease in carbon monoxide over this period?
4.6 / 25 = 0.184 ppm/yr

c. What is the total percentage decrease in carbon monoxide over this period?
4.6 / 6.1 x 100% = 75%
d. What is the average yearly percentage decrease in carbon monoxide over this period?
75% / 25 = 3% /yr

45. A metal cylinder has a radius of 0.55 cm and a length of 2.85 cm. Its mass is 24.3 grams.
a. What is the density of the metal? For a cylinder, V = π r 2 x h, where r is the radius of the
cylinder and h is the height of the cylinder. π = 3.14.
24.3 / (0.95 x 2.85) = 9 grams
b. Compare the density of the metal to the densities of various substances listed in Table
2.4. Can you identify the metal? Copper

Feature Problems and Projects:
52. Consider each of the following balances. Which one is the most precise? C. 5.4249 g
Which one is the least? A. 5.42 g
How much uncertainty is associated with each balance?
(5.42 + 5.424 + 5.4249) / 3 = 5.4229 g

A. 5.4229 – 5.42 = +0.0029 g
B. 5.4229 – 5.424 = +0.0011 g
C. 5.4229 – 5.4249 = +0.002 g

53. Each of the following coins is photographed to scale. Measure each using a metric ruler
(in cm) and record the diameter to the precision reflected in the ruler. Make a simple graph of
the value of the coin (x-axis) and the diameter of the coin (y-axis). Is there any correlation
between these two quantities? Which coin does not fit the general trend?

1. cent: 1.8 cm
2. 5-cents: 2cm
3. dime: 1.8 cm
4. quarter : 2.3 cm
5. half: 3cm
6. one: 3.8 cm

There is a correlation between these two quantities. As the value of a coin increases, so
does its diameter, except for the dime.

Example A1.1
Determining the Number of Significant Figures How many significant figures are in each of the
following numbers?
0.0087 two
4.50 x 105 three
45.5 three
164.09 five
0.98850 five

Example A1.3
Carry out the following calculation to the correct number of significant digits:
4.342 + 2.8703 + 7.88 – 2.5 = 12.6

Calculate the price of your order

Select your paper details and see how much our professional writing services will cost.

We`ll send you the first draft for approval by at
Price: $36
  • Freebies
  • Format
  • Formatting (MLA, APA, Chicago, custom, etc.)
  • Title page & bibliography
  • 24/7 customer support
  • Amendments to your paper when they are needed
  • Chat with your writer
  • 275 word/double-spaced page
  • 12 point Arial/Times New Roman
  • Double, single, and custom spacing
  • We care about originality

    Our custom human-written papers from top essay writers are always free from plagiarism.

  • We protect your privacy

    Your data and payment info stay secured every time you get our help from an essay writer.

  • You control your money

    Your money is safe with us. If your plans change, you can get it sent back to your card.

How it works

  1. 1
    You give us the details
    Complete a brief order form to tell us what kind of paper you need.
  2. 2
    We find you a top writer
    One of the best experts in your discipline starts working on your essay.
  3. 3
    You get the paper done
    Enjoy writing that meets your demands and high academic standards!

Samples from our advanced writers

Check out some essay pieces from our best essay writers before your place an order. They will help you better understand what our service can do for you.

  • Analysis (any type)
    Advantages and Disadvantages of Lowering the Voting Age to Thirteen
    Undergrad. (yrs 1-2)
    Political science
  • Coursework
    Undergrad. (yrs 1-2)
    Business Studies
  • Essay (any type)
    Is Pardoning Criminals Acceptable?
    Undergrad. (yrs 1-2)
    Criminal Justice

Get your own paper from top experts

Order now

Perks of our essay writing service

We offer more than just hand-crafted papers customized for you. Here are more of our greatest perks.

  • Swift delivery
    Our writing service can deliver your short and urgent papers in just 4 hours!
  • Professional touch
    We find you a pro writer who knows all the ins and outs of your subject.
  • Easy order placing/tracking
    Create a new order and check on its progress at any time in your dashboard.
  • Help with any kind of paper
    Need a PhD thesis, research project, or a two-page essay? For you, we can do it all.
  • Experts in 80+ subjects
    Our pro writers can help you with anything, from nursing to business studies.
  • Calculations and code
    We also do math, write code, and solve problems in 30+ STEM disciplines.

Frequently asked questions

Get instant answers to the questions that students ask most often.

See full FAQ
  • Is there a possibility of plagiarism in my completed order?

    We complete each paper from scratch, and in order to make you feel safe regarding its authenticity, we check our content for plagiarism before its delivery. To do that, we use our in-house software, which can find not only copy-pasted fragments, but even paraphrased pieces of text. Unlike popular plagiarism-detection systems, which are used by most universities (e.g., we do not report to any public databases—therefore, such checking is safe.

    We provide a plagiarism-free guarantee that ensures your paper is always checked for its uniqueness. Please note that it is possible for a writing company to guarantee an absence of plagiarism against open Internet sources and a number of certain databases, but there is no technology (except for itself) that could guarantee no plagiarism against all sources that are indexed by turnitin. If you want to be 100% sure of your paper’s originality, we suggest you check it using the WriteCheck service from and send us the report.

  • I received some comments from my teacher. Can you help me with them?

    Yes. You can have a free revision during 7 days after you’ve approved the paper. To apply for a free revision, please press the revision request button on your personal order page. You can also apply for another writer to make a revision of your paper, but in such a case, we can ask you for an additional 12 hours, as we might need some time to find another writer to work on your order.

    After the 7-day period, free revisions become unavailable, and we will be able to propose only the paid option of a minor or major revision of your paper. These options are mentioned on your personal order page.

  • How will I receive a completed paper?

    You will get the first version of your paper in a non-editable PDF format within the deadline. You are welcome to check it and inform us if any changes are needed. If everything is okay, and no amendments are necessary, you can approve the order and download the .doc file. If there are any issues you want to change, you can apply for a free revision and the writer will amend the paper according to your instructions. If there happen to be any problems with downloading your paper, please contact our support team.
  • Where do I upload files?

    When you submit your first order, you get a personal account where you can track all your orders, their statuses, your payments, and discounts. Among other options, you will have a possibility to communicate with your writer via a special messenger. You will be able to upload all information and additional materials on your paper using the “Files” tab on your personal page. Please consider uploading everything you find necessary for our writer to perform at the highest standard.
See full FAQ

Take your studies to the next level with our experienced specialists

Live Chat+1 (857) 777-1210 EmailWhatsApp