Lets see what you know or need to
- Slides: 21
Let’s see what you know!! (or need to know) n Please use the color cards to answer the following questions. n If not sure of the answer, do your BEST guess. n Best of luck!!
1. A regularly-shaped block of wood has the following dimensions: 15. 0 cm X 10. 0 cm X 1. 5 cm. The wood block’s mass is 234. 06 grams. Will this block of wood sink or float in water at room temperature (25 o. C)? n Orange: sink n Green: float n Blue: you cannot tell from the information given
What is the correct chemical formula for calcium phosphate? n Orange: Ca. PO 4 n Green: Ca 2(PO 4)3 n Blue: Ca 3(PO 4)2 n Pink: Ca 3(PO 3)2 n Yellow: Ca 2(PO 3)3
3. Which of the following is an empirical formula? Pink: C 2 H 6 Blue: C 3 H 8 Orange: HC 2 H 3 O 2 Green: Na 2 C 2 O 4
4. Which of the following has the highest percent of iron? You may use your calculator!! n Orange: Fe 2 O 3 n Green: Fe 3 O 4 n Blue: Fe. O n Pink: Fe. Cl 2 n Yellow: Fe. Cl 3
5. How many neutrons does an atom of the isotope uranium-236 have? n Orange: 93 n Green: 236 n Blue: 146 n Pink: 144 n Yellow: 92
6. When the following equation is balanced, what is the coefficient of CO 2? C 4 H 10(g) + O 2 Blue: 2 Pink: 4 Green: 6 Yellow: 8 Orange: 1 CO 2(g) + H 2 O(g)
7. What is the correct chemical formula for perchloric acid? n Orange: HCl n Green: HCl. O n Blue: HCl. O 2 n Pink: HCl. O 3 n Yellow: HCl. O 4
8. What is the oxidation state for the barium ion? n Orange: 0 n Green: +1 n Blue: +2 n Pink: -1 n Yellow: -2
#9. The empirical formula for styrene is CH. What is the molecular formula for styrene? n The molar mass for styrene is 104. 1 g/mol. n Pink: C 2 H 4 n Green: C 8 H 8 n Blue: C 10 H 12 n Yellow: C 6 H 6 n Orange: C 4 H 4
#10. What is the correct name for the following molecule? N 2 O 3 n Pink: nitrogen oxide n Green: dinitrogen trioxide n Blue: nitrogen trioxide n Orange: dinitrogen tetraoxide
#11. What is the correct name for Cr 2(SO 4)3? n Pink: chromium sulfite n Green chromium sulfate n Blue: chromium (II) sulfite n Orange: chromium (II) sulfate n Yellow: chromium (III) sulfate n No color: chromium (III) sulfite
#12. HBr. O 2 (aq) is named: n Pink: bromous acid n Green: bromic acid n Blue: perbromic acid n Yellow: hypobromic acid n Orange: I am clueless and starting to cry a little
#13. n Pink: How many grams of calcium nitrate are there in 1. 67 X 10 -4 moles of calcium nitrate? 1. 02 X 10 -6 g n Blue: 9. 83 X 105 g n Orange: 1. 71 X 10 -2 g n Green: 2. 74 X 10 -2 g n Yellow: 6. 11 X 105 g
Free Response Questions n 14. How many oxygen atoms are there in 2. 55 grams of sucrose, C 12 H 22 O 11? MUST SHOW WORK TO GET CREDIT!!
Question #15 n What is the percent composition of Na. Cl. O 3?
Question #16 n The mass spectrum of bromine (Br 2) consists of three peaks with the following characteristics: What is the average mass? Mass(amu) n 157. 84 n 159. 84 n 161. 84 n Relative size of peak. 2534. 5000. 2466
Question #17 n Write the balanced equation for the addition of solutions of sodium chromate and silver nitrate.
Question #18 n The compound adrenaline contains 56. 79% C, 6. 56%H, 28. 37%O, and 8. 28% N by mass. What is the empirical formula for adrenaline?
Question #19 n Adipic acid is an organic compound composed of 49. 31%C, 43. 79% O, and the rest hydrogen. If the molar mass of adipic acid is 146. 1 g/mol, what are the empirical and molecular formulas for adipic acid?
Question #20, hydrate of zinc nitrate Test Tube only 17. 09 g Test Tube + hydrate 19. 88 g Hydrate only TT + anhydrous salt Mass of H 2 O removed Determine the empirical Formula from this info g 18. 87 g
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