CHEM 120 Week 5 Exam 2 (Units 3 and 4) Answer key
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| Institution | Chamberlain |
| Contributor | Karin Austin |
Exam 2: Chapters 5,6,7,8
PART 1: Multiple Choice questions: Q 1-24. (2 point each)
1. Chemical reactions (equations) show the following
2. The following is true for a mole
3. In balancing chemical equations, the coefficients are used to
4. 2H2 + O2 2H2O means that
5. 2H2 + O2 2H2O. In this equation, correct method to calculate molecular mass of water is
6. One mole of O2 gas contains number of molecules.
7. Concentration of a solution is _____
8. The following is a product of reaction of a nonmetal oxide with water to make acid.
9. If CaO reacts with water, the following product will be made.
10. The following will be made when KOH reacts with HCl.
11. “The neutralization reaction is a quantitative reaction, where amount of acid needed to neutralize the base can be accurately calculated.” This statement is _____
12. The pH scale represents the _____
13. Buffer solution is a solution _____
14. Oxidation is defined as . It occurs on a/an _____.
15. Reduction is defined as _____ . It occurs on a/an _.
16. Oxidizing agents cause _____. During that process they themselves are __.
17. Reducing agents cause . During that process they themselves are __
18. Silver tarnish is an example of _____
19. Oxygen is a _____.
20. Photosynthesis combines CO2 and H2O into glucose via a series of __ reactions.
21. ellular Respiration generates CO2 and H2O from glucose via a series of ____ reactions.
22. The following is true for Boyle’s law.
23. The following is true for Charles’s law.
24. At STP, what would be the molar mass of a gas with density of 2.1g/L?
PART 2: Write units and show ALL work.
25. Calculate the molarity of a 250 ml solution containing 420g Aluminum hydroxide (2 points).
26. 0.5 M stock solution of NaCl was diluted to 50 mM solution in 350 ml volume. Calculate the volume needed to make this dilution. (2 points)
27. (a) Complete and balance the reactions given below. (b) Answer the given question (5 points). b. Calculate the amount in gram of acid needed to produce 50 g of Salt.
28. Calculate the pressure, in atmospheres, of 9.81 mol CO(g) in a 7.5 L tank at 35 degrees C. (3 points)
| Instituition / Term | |
| Term | Summer |
| Institution | Chamberlain |
| Contributor | Karin Austin |
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-80x80.JPG "CHEM 120 Week 6 Discussion: Radiation - Radioisotope Tc-99m")
