Homework:
Study guide - Check your answers.  Review your study guides. Quiz yourself or your study buddy.

17.    For the previous question (16. Which of the following is an element?), how do you know?  Explain:

Chemical symbol always has an upper case letter for the first letter and a lower case letter for the second letter.

18.      Why are some elements in the same family (column) on the periodic table?  What do they share?

                              properties

For the next 2 questions, use this link to see the first pie chart (What do we throw away?) at another website:    http://www2.epa.gov/recycle/recycling-basics

19.     Think about all the trash we make ordering take-out and other activities.                       What percentage of trash is recycled or composted? _34.1%__%

20.    What is the total percentage of the two smallest slices or wedges of this chart?

  _11.7____% + __34.1____ % =  _45.8_%     

What categories make up these slices?

_composted _ and _combusted_.

 For the next 2 questions, use this link to see the first pie chart (What do we throw away?) at another website:  http://visual.ly/which-girl-scout-cookies-score-most-brownie-points

25. What percentage of cookie sales is made up of Samosas or Caramel deLites?                      19%.                                                                                                                                   
What are the three largest percentages of cookies sold?                                                                                               ____Thin Mints___  =        _25%                                                                                               ____Other_______  =        _23%                                                                             Samosas or Caramel deLites =                   _19%   

26. If you’re their business consultant, which cookie line would you tell them to drop and why?

Shortbread / Trefoils  sell only  9 %

27. What is the smallest percentage of cookies sold?                           
  Shortbread / Trefoils   =  9 %

Name_______________________________  Date: _____________   Per: ____________

Study Guide for Chemistry of Materials. Pt. 2

Instructions: This study guide includes material to study but does not reference every question that will be on the test.

Are you thirsty yet?  Look at this pie chart of how we use our water:  http://www.epa.gov/watersense/our_water/water_use_today.html

28. How much of our water do we get from the faucet?

 15.7%

29. What uses of water are the two largest percentages?                                          _Toilet_____  = _26.7____%           

Clothes Washer  = _21.7_%           

Study the following pie charts carefully and answer the questions given alongside it:

30. What component of the human body has the highest fraction?                                                           .  Hormones & Enzymes                                         Convert it to percent:                                                                               40%

31. What would be the mass of water in the body of a person weighing 50 kg (110 lbs.)?

                    35 kg (77 lbs.)

32.  In the human body, what part is made of neither bones nor skin (hint: upper disk)?

               Hormones & Enzymes, Muscles:  40% + 33.3% = 73.3%

33. Your friend says you should buy a certain game system that uses uranium batteries.  They are cheaper and last longer but they are radioactive and are not as safe as systems that use regular batteries.  Also, when they are used up, you have to dispose of them in special dumps or they will poison the water. What model should you buy?  Discuss the tradeoffs.

Make a choice. Use the word "trade-off". Discuss advantages and disadvantages (as many as you can find) of the choice you made. Ex: 

"I would not choose the system with uranium batteries. Disadvantages include that uranium batteries are radioactive, and they must be taken to special dumps for disposal. These disadvantages outweigh the advantages that uranium batteries are less expensive, and last longer, than other batteries.  This is why I would not choose a system with radioactive batteries. 

34. When you dilute a substance, what are you doing to it?

Adding water

35. If you dilute a solution enough that you can no longer see the color:

1. Has all the solute been removed?                                                           __No_

b.    How can you tell if solute is still in the solution? 

Use an indicator such as ammonia_

3. What did we do in our lab that showed that a solution contained copper even when we could no longer see the color in the diluted solution?

Added ammonia to indicate if there was any copper in solution that was at too low a concentration for us to see with our eyes.

4. What can you conclude about the chemical that we added?

_ Adding ammonia indicates if there was any copper in solution that was at too low a concentration for us to see with our eyes

5. What Law tells you that the solute was not simply destroyed?

Law of Conservation of Matter

36. What does dilution do to the concentration of a solute or toxin in liquid waste?

Adding water reduces the concentration

37. What is serial dilution? 

Adding water over and over (in a series of steps) to reduce the concentration of a toxic chemical to within legal or environmental limits

38. Fill out the following table connecting ppm (parts per million) to fractions:

1 ppm     ex:	1__       .                     1,000,000
10 ppm	10__       .                     1,000,000
100 ppm	100    1,000,000
1,000 ppm      ex:	1,000     .   1,000,000
10,000 ppm	10000    .   1,000,000
100,000  ppm	100,000  .   1,000,000