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1. All of the following involve a chemical change EXCEPT
A. the formation of HCl from H2 and Cl 2B. the color change when NO is exposed to airC. the formation of steam from burning H2 and O2D. the solidification of vegetable oil at low temperaturesE. the odor of NH3 when NH4Cl is rubbed together with Ca(OH)2 powder
2. When most fuels burn, the products include carbon dioxide and
A. hydrocarbonsB. hydrogenC. waterD. hydroxideE. hydrogen peroxide
3. In the metric system, the prefix kilo- means
A. 100B. 10-1C. 10-2D. 102E. 103
4. How many atoms are in 1 mole of water?
A. 3B. 54C. 6.02 × 1023D. 2(6.02 × 1023)E. 3(6.02 × 1023)
5. Which of the following elements normally exist as monoatomic molecules?
A. ClB. HC. OD. NE. He
6. The shape of a PCl3 molecule is described as
A. bentB. trigonal planarC. linearD. trigonal pyramidalE. tetrahedral
7. The complete loss of an electron of one atom to another atom with the consequent formation of electrostatic charges is referred to as
A. a covalent bondB. a polar covalent bondC. an ionic bondD. a coordinate covalent bondE. a pi bond between p orbitals
8. In the electrolysis of water, the cathode reduction reaction is
A. 2H2O(l) + 2e- → H2(g) + 2OH- + O2(g)B. 2H2O(l) → O2(g) + 2H+ + 2e-C. 2OH- + 2e- → O2(g) + H2(g)D. 2H+ + 2e- → H2(g)E. 2H2O(l) + 4e- → O2(g) + 2H2(g)
9. Which of the following radiation emissions has no mass?
A. Alpha particleB. Beta particleC. ProtonD. NeutronE. Gamma ray
10. If a radioactive element with a half-life of 100 years is found to have transmutated so that only 25% of the original sample remains, what is the age, in years, of the sample?
A. 25B. 50C. 100D. 200E. 400
11. What is the pH of an acetic acid solution if the [H3O+] = 1 × 10-4 mole/liter?
A. 1B. 2C. 3D. 4E. 5
12. The polarity of water is useful in explaining which of the following?
I. The solution process
II. The ionization process
III. The high conductivity of distilled water
A. I onlyB. II onlyC. I and II onlyD. II and III onlyE. I, II, and III
13. When sulfur dioxide is bubbled through water, the solution will contain
A. sulfurous acidB. sulfuric acidC. hyposulfuric acidD. persulfuric acidE. anhydrous sulfuric acid
14. Four grams of hydrogen gas at STP contain
A. 6.02 × 1023 atomsB. 12.04 × 1023 atomsC. 12.04 × 1046 atomsD. 1.2 × 1023 moleculesE. 12.04 × 1023 molecules
15. Analysis of a gas gave: C = 85.7% and H = 14.3%. If the formula mass of this gas is 42 atomic mass units, what are the empirical formula and the true formula?
A. CH; C4H4B. CH2; C3H6C. CH3; C3H9D. C2H2; C3H6E. C2H4; C3H6
16. Which fraction would be used to correct a given volume of gas at 300K to its new volume when it is heated to 333K and the pressure is kept constant?
A. B. C. D. E.
17. What would be the predicted freezing point of a solution that has 684 grams of sucrose (1 mol = 342 g) dissolved in 2,000 grams of water?
A. -1.86°C or 271.14 KB. -0.93°C or 272.07 KC. -1.39°C or 271.61 KD. -2.48°C or 270.52 KE. -3.72°C or 269.28 K
18. What is the approximate pH of a 0.005 M solution of H2SO4?
A. 1B. 2C. 5D. 9E. 13
19. How many grams of NaOH are needed to make 100 grams of a 5% solution?
A. 2B. 5C. 20D. 40E. 95
20. For the Haber process: N2 + 3H2 2NH3 + heat (at equilibrium), which of the following statements concerning the reaction rate is/are true?
I. The reaction to the right will increase when pressure is increased.
II. The reaction to the right will decrease when the temperature is increased.
III. The reaction to the right will decrease when NH3 is removed from the chamber.
21. If you titrate 1.0M H2SO4 solution against 50. milliliters of 1.0M NaOH solution, what volume of H2SO4, in milliliters, will be needed for neutralization?
A. 10.B. 25.C. 40.D. 50.E. 100
22. How many grams of CO2 can be prepared from 150 grams of calcium carbonate reacting with an excess of hydrochloric acid solution?
A. 11B. 22C. 33D. 44E. 66
The diagram represents a setup that may be used to prepare and collect
A. NH3B. NOC. H2D. SO3E. CO2
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