Quiz 3 Name: _______________________________________ Chemistry 102, Lecture 401 – Fall 2016 DS Section: (1 point) ____________________________ 1. Convert the samples listed into the units in the table. (2 points) Size in meters Size in pm Mist droplet (10–3 mm) Mimivirus (600 nm) 10–6 m 106 pm 6×10–7 m 6×105 pm a. Which is bigger and by how much? (1 point) 106 m
 1.7 times bigger 6  107 m
The mist droplet is bigger: 2. The densest element is osmium. What is the mass in pounds (lb) of a cube of osmium with an edge length of 0.55 in? The density of osmium is 22.59 g∙cm–3. (2 points) volume   side    0.55 in   0.17 in 3
3
3
3
3
3  2.54 cm   22.59 g   1 lb 
0.17
in

  in 3   cm3   454 g   0.14 lb 



3. Complete the table. (4 points) Nuclear Name symbol A Z # protons # neutrons # electrons Nuclear charge phosphorus‐31 31
P 31 15 15 16 15 +15 lithium‐7 7
Li 7 3 3 4 3 +3 4. There are two stable isotopes of boron. If one isotope of boron has 6 neutrons, what also must be true? (Circle all correct answers – 2 points) a. The other isotope also has 6 neutrons. b. Both isotopes have a nuclear charge of +5. c. All atoms of boron have 6 electrons. d. The isotope of boron with 6 neutrons is called boron‐6.