discussion questions and week 2 excercises

There are two sections to this assignment. BOTH must be completed

Section 1

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Discussion questions

Each answer must be 100 words

Each answer must be in your own words.

  • What are atoms?
  • What is an Electrical Charge?
  • Define elements and compounds. Give an example of elements and compounds and describe some of the properties of your examples.
  • What are metals, nonmetals, and metalloids?
  • Definition of the Periodic Table.
  • List the different types of chemical reactions listed in your textbook. (Synthesis, Decomposition reactions, Single displacement reaction) Give an example. Describe a real world use of the chemical reaction that you provided.
  • Definition of Chemical Reactios
  • What is Stoichiometry?

Section 2

Week 2 Exercises

Prepare written answers to the following exercises:

  • Determine the number of electrons, protons and neutrons in each isotope of titanium based on the table below. Determine its atomic mass.
  • For each compound listed below write down the correct formula and calculate the formula mass.


Mass (Da)

Natural Abundance (%)




Atomic Mass
















  • Iron(III) sulfide
  • Aluminum nitrate
  • Carbon tetrachloride
  • Perchloric acid
  • Ammonium hydroxide
  • Aluminum is refined from the mineral bauxite, which is mostly aluminum hydroxide (Al(OH)3). Presuming that an ore sample is approximately 54% bauxite, how much Al could be extracted from 1 kg of ore?
  • Calcium carbonate (a weak base) reacts with nitric acid (a strong acid) quantitatively in the following reaction to form calcium nitrate, water and carbon dioxide:
  • Metallic sodium reacts vigorously with liquid bromine in the following reaction:
  • The combustion of gasoline (C8H18) with excess oxygen produces carbon dioxide and water.

How many kg of carbon dioxide (CO2) are formed per kg of CaCO3 reacted? Presume that there is an excess of HNO3 available.

1 kg of Na is brought into contact with 3 kg of liquid bromine. Presuming that the reaction is quantitative and proceeds to completion, determine the limiting reagent and the quantity of NaBr formed. Determine the amount of excess reagent remaining after the reaction is complete.

  • Write a balanced chemical reaction for the combustion of gasoline to yield carbon dioxide and water.
  • Presuming that a tank of gasoline contains 80 liters and that its density is 0.77 kg/liter, determine how many kg of CO2 are produced for each tank of gasoline burned.
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