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1. What is the number of protons and neutrons in an atom with mass number 89 and atomic number 39?
A. 50 protons and 50 neutronsB. 50 protons and 39 neutronsC. 39 protons and 89 neutronsD. 39 protons and 50 neutronsE. 39 protons and 39 neutrons
2. …C4H10(g) +…O2(g) →…CO2(g) +…H2O(l)
When the above equation is balanced using the lowest whole-number terms, the coefficient of CO2 is
A. 2B. 4C. 8D. 10E. 13
3. Which of the following is closest in mass to a proton?
A. Alpha particleB. PositronC. NeutronD. ElectronE. Hydrogen molecule
4. What is the approximate percentage composition by mass of the element oxygen in the compound HClO4?
A. 16%B. 32%C. 50%D. 64%E. 75%
5. If two atoms that differ in electronegativity combine by chemical reaction and share electrons, the bond that joins them will be
A. metallicB. ionicC. a hydrogen bondD. nonpolar covalentE. polar covalent
6. When the temperature of a 20-gram sample of water is increased from 10°C to 30°C, the heat transferred to the water is
A. 600 caloriesB. 400 caloriesC. 200 caloriesD. 30 caloriesE. 20 calories
7. What is the oxidation state of chromium, Cr, in the compound potassium dichromate, K2Cr2O7?
A. 1B. 2C. 3D. 6E. 12
8. An aqueous solution with pH 5 at 25°C has a hydroxide ion (OH–) concentration of
A. 1 10–11 molarB. 1 10–9 molarC. 1 10–7 molarD. 1 10–5 molarE. 1 10–3 molar
9. 2H2O(g) → 2H2(g) + O2(g)
The volume of water vapor required to produce 44.8 liters of oxygen by the above reaction is
A. 11.2 litersB. 22.4 litersC. 44.8 litersD. 89.6 litersE. 100.0 liters
10. When 190 grams of MgCl2 are dissolved in water and the resulting solution is 500 milliliters in volume, what is the molar concentration of MgCl2 in the solution?
A. 2.0 MB. 4.0 MC. 8.0 MD. 12.0 ME. 16.0 M
11. When a fixed amount of gas has its Kelvin temperature doubled and its pressure doubled, the new volume of the gas is
A. four times greater than its original volumeB. twice its original volumeC. unchangedD. one-half its original volumeE. one-fourth its original volume
12. In 12.4 hours, a 100 gram sample of an element decays so that its mass is 25 grams. What is the approximate half-life of this radioactive substance?
A. 1.6 hoursB. 3.1 hoursC. 6.2 hoursD. 24.8 hoursE. 49.6 hours
13. In the equation Q → + , the species represented by Q is
A. B. C. D. E.
14. A compound with a molecular weight of 56 amu has an empirical formula of CH2. What is its molecular formula?
A. C2H2B. C2H4C. C4H8D. C4H10E. C6H12
15. The change in heat energy for a reaction is best expressed as a change in
A. enthalpyB. absolute temperatureC. specific heatD. entropyE. kinetic energy
16. …NF3(g) +…H2O(g) →…HF(g) +…NO(g) +…NO2(g)
When the equation for the reaction above is balanced, how many moles of NF3 would be required to react completely with 6 moles of H2O?
A. 0.5 moleB. 1 moleC. 2 molesD. 3 molesE. 4 moles
17. Which characteristic is associated with bases?
A. React with metal to produce hydrogen gasB. Donate an unshared electron pairC. Always contain the hydroxide ion in their structureD. Taste sourE. Formed by the reaction of a nonmetal oxide and water
18. An element has the following properties: shiny, brittle, poor electrical conductivity, and high melting point. This element can be best classified as a(n)
A. alkali metalB. halogenC. metalloidD. transition metalE. noble gas
19. Which of the following forward processes produces a decrease in entropy?
I. H2O(g) → H2O(l)
II. Fe2+ (aq) + S2– (aq) → FeS(s)
III. 2SO3(g) 2SO2(g) + O2(g)
A. I onlyB. III onlyC. I and II onlyD. II and III onlyE. I, II, and III
20. Which of the following will raise the boiling point of a sample of water?
A. Heat the waterB. Mix gasoline into the waterC. Bring the water sample to a higher altitudeD. Place the water sample on a magnetic stirrerE. Dissolve table sugar into the water
21. Elements H and J lie in the same period. If the atoms of H are smaller than the atoms of J, then compared to atoms of J, atoms of H are most likely to
A. exist in a greater number of isotopesB. exist in a lesser number of isotopesC. exist in a greater number of oxidation statesD. have a greater positive charge in their nucleiE. have a lesser positive charge in their nuclei
22. …Al(s) +…O2(g) →…Al2O3(s)
When the equation representing the reaction shown above is completed and balanced and all coefficients are reduced to lowest whole-number terms, the coefficient of O2(g) is
A. 1B. 2C. 3D. 4E. 6
23. Which of the following solids has a brilliant blue color?
A. Ca(OH)2B. KClC. NaBrD. Fe2O3E. CuSO4
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