CHEM ITest 1 Study Guide Porter

This study guide is a brief overview of everything that we have covered in class. The test will have similar questions but will be designed to challenge you. Don’t expect questions to be in the same format as you see here. I don’t care if you use a calculator but I want to see your work. Turn all your answers and work in on a separate sheet of paper for HW credit. Keep your work neat and organized. Number your answers!

Scientific Notation – be able to express numbers in scientific notation and standard form. Express the following in scientific notation.

  1. .000000234
  2. 456,890

Express the following in standard form.

  1. 3.5x103
  2. 5.789x10-4

Calculate the following. Answers should be expressed in scientific notation. Show all work.

  1. (12x104)(4x1045)
  2. 456.5x104 + 2.67x103

Accuracy Precision – be able to define both terms in your own words

  1. Given the two sets of data below, determine whether each student was accurate, precise, both or neither if the accepted value of a measurement is 56.77cm.

Trial # / Student measurement #1 / Student measurement #2
1 / 56.78cm / 56.70cm
2 / 56.75cm / 55.81cm
3 / 56.76cm / 59.01cm
  1. What is the error and % error of all the measurements taken by student #1? (memorize both equations)

Significant Figures– know your rules for determining significant figures

Calculate the following maintaining the correct amount of significant figures in your answer.

  1. 786.54 + 34.567
  2. (45.00)(34.004)
  3. 36.002/0.0003

Dimensional Analysis

Make the following conversions. Show all your work.

  1. 56.8 cm to miles
  2. What is the volume of an object that has a mass of 80.0 g and a density of 54 g/mL?
  3. What is the mass of an object that has a volume of 45.0 cm3 and a density of 35.0 kg/L?
  4. 3.45 m/s to mph

You need to know all the definitions given in class. There may be questions that simply ask you to explain what something means. Also, I want you to memorize the metric prefixes of kilo-, deca-, deci-, centi-, and mili-. That means if I ask you to convert 5 dm to meters, you will have memorized that

10 dm = 1 m (check out the back of the sheet)

Prefix / Symbol / Meaning / Conversion factor (m)
kilo- / k / thousand / 1 km = 1000 m
deca- / da / ten / 1 dam = 10 m
deci- / d / tenth / 10 dm = 1 m
centi- / c / hundredth / 100 cm = 1 m
milli- / m / thousandth / 1000 mm = 1 m

What should be in the homework section of your binder?

  1. Web hunt (first day of class)
  2. Scientific Notation - p.41 #11, 12, p.42 #13, p.43 #15
  3. Significant figures - p. 49 #32, 33, 34, p. 51 #35, 36, p. 53 #40, p. 54 #42
  4. Significant Figure Problem Set (this was a worksheet you received when I was absent)
  5. Dimensional Analysis – p. 45 #19, 20, p. 63 #80, 81, 82, 83
  6. This study guide with the work done on a separate sheet of paper

Ryan: Did this happen on company property?

Michael Scott: It was on company property, with company property. So, double jeopardy, we're fine.

Ryan: I don't think-- I don't think you understand how jeopardy works.

Michael Scott: Oh, I'm sorry. What is, 'we're fine'?