17. What is the name of the compound Alzos? (a) Aluminum trioxide. (b) Aluminum

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17. What is the name of the compound Alzos? (a) Aluminum trioxide. (b) Aluminum dioxide (c) Dialuminum trioxide. (d) Aluminum (III) oxide. (e) Aluminum oxide. 18. What is the mass% of H in HI? (a) 0.7881% (b) 0.7943% c) 7.943% (d) 50.00% (e) 99.21% 19. What is 12.0 0.4050 with the correct number of significant figures? (a) 12 (b) 11.6 (c) 11.59 (d) 11.595 (e) 11.5950 20. How many moles of KCl are contained in 100.0 mL of a 0.250 M KCI(aq) solution? (a) 0.0250 moles (b) 0.100 moles (c) 0.250 moles (d) 1.00 moles (e) 25.0 moles 21. What is the formula unit of iron (Ill) chloride? a) FeCl b) Fe3C (c) FeCl3 d) Fe3Cl (e) None of the above. 22. Which one of the following is a characteristic of ro temperature mercury, Hg(l)? (a) Hg atoms move past each other but on avera the atoms are about as close together as another state of matter. (b) Hg atoms vibrate in place but are fixed relative each other. (c) Hg atoms move randomly at high speed, collidi occasionally, with large distances between t atoms on average. (d) The kinetic energy of the Hg atoms is the lowe of any of the states of matter. (e) Hg atoms do not completely fill the container in which they are placed. 23. Balance the equation C3HBO O2 (g) CO2(g) H20 (l). What is the sum of the coefficients in th balanced equation? a) 12 b) 13 c) 24 d) 25 e) 26 24. What is the correct formula unit for magnesium sulfate? a) Mg2SO. b) MgSO4. c) Mg (SO4)2 d) Mg3SO4 (e) Mg2(SO4)2 25. What type of substance is HNO3? (a) An ionic and molecular compound. (b) A binary acid. (c) An element (d) An oxoacid. (e) A polyatomic ion

Explanation / Answer

17.d

18.a

19.d

20.a

21.c

22.b

23.d

24.b

25.d

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