Practice Multiple Choice 1. A theory differs from a hypothesis in that a theory A. cannot be disproved C. always leads to the formation of a law B. represents an educated guess D. has been subjected to experimental testing 2. Which property depends upon the quantity of a substance? A. boiling point C. density B. temperature D. mass 3. Which is a chemical change? A. melting of ice C. electrolysis of water B. boiling of water D. condensation of steam 4. We know that air is a mixture and not a compound because A. it is colorless C. it can be heated to a higher temperature B. its composition can vary D. it can be compressed to a smaller volume 5. Which of the following is a molecule? A. Neon gas C. salt B. Nitrogen gas D. salt water 6. Which of the following is best classified as a homogeneous mixture? A. pizza C. hot tea B. ice water D. copper wire 7. In which phase of matter does an increase in pressure produces the greatest change in the volume of a sample? A. gas C. solid B. liquid D. all affected equally 8. Some ceramic materials are superconducting at the boiling point of liquid nitrogen, 77K. What is the temperature in degrees Celsius? A. 350 C C. 196 C B. -196 C D. -160 C 9. Consider 3 samples of gold. One has a mass of 42.0mg, the second has a mass of 2.44g, and the third is 0.00458kg. What is the total mass of the three samples? A. 7.06 g C. 44.4 g B. 44.44 g D. cannot be determined 10. Which measurement contains 4 significant figures? A. 0.002 L C. 0.0020 L B. 2020 L D. 200.0 L
11. A student needs to measure exactly 5.0cm 3 of a liquid. Which should be used? A. beaker C. graduated cylinder B. electric balance D. flask 12. What is the correct answer with significant figures when adding 3.4ml to 15.79ml? A. 19.19ml 2 B. 19.19ml C. 19.2ml D. 20.0ml 13. What is the composition of one atom of bromine-80? A. 35p +, 36e -, 45n C. 35p +, 36e -, 80n B. 35p +, 35e -, 45n D. 35p +, 35e -, 80n 14. How many electrons are present in the selenide ion? A. 34 B. 35 C. 36 D. 37 15. An ion contains 19 protons, 20 neutrons, and 18 electrons. What is the symbol of the ion? A. Ca 2+ C. argon B. K + D. Br - 16. The atomic number of an element is the same as the number of A. protons C. neutrons B. protons + electrons D. protons + neutrons 17. What will be the charge of a strontium ion? A. 1 + C. 1 - B. 2 + D. 2-18. The ion CH + has been detected in the tails of comets. What is the total number of electrons in CH +? A. 5 C. 7 B. 6 D. 8 19. Based on the position of indium on the periodic table (#49), what is the most likely formula for indium chloride? A. In 3 Cl 3 C. In 2 Cl 3 B. In 4 Cl 3 D. InCl 3 20. How many neutrons are in the isotope phosphorus-29? A. 14 C. 16 B. 15 D. 17 21. What is the formula for magnesium hydroxide? A. MgOH C. Mg(OH) 2 B. MgOH 2 D. Mg(OH 2 )
22. What is the formula for the compound dinitrogen monoxide? A. NO B. NO 2 C. N 2 O D. N 2 O 2 23. What is the name of (NH 4 ) 2 CrO 4? A. dinitride tetrachromide C. diammonium chromate B. ammonium tetrachromate D. ammonium chromate 24. Which of the following does not contain a polyatomic ion? A. calcium sulfide C. calcium sulfite B. calcium hydroxide D. calcium carbonate 25. What is the name of FeCl 3? A. iron trichloride C. iron chloride (III) B. iron chloride D. iron (III) chloride 26. What is the name of PCl 3? A. phosphorus trichloride C. phosphorus (III) chloride B. phosphorus chloride D. phosphorus chloride (III) 27. What is the molar mass of aluminum carbonate? A. 87.0 g/mol C. 210.0 g/mol B. 207.0 g/mol D. 234.0 g/mol 28. What is the number of molecules in 4.40g of carbon dioxide? A. 0.100 molecules C. 6.02 x 10 22 molecules B. 1.6 x 10 24 molecules D. 1.81 x 10 23 molecules 29. What is the number of calcium ions in one mole of calcium phosphide? A. 6.02 x 10 23 ions C. 3.01 x 10 24 ions B. 1.81 x 10 24 ions D. 8.31 x 10-24 ions 30. What is the mass of 0.500 mol of aluminum chloride? A. 31g C. 142 g B. 67g D. 153 g 31. A compound consists of 36.6% sodium, 25.4% sulfur, and 38.0% oxygen. What is the empirical formula? A. Na 2 SO 3 C. NaSO B. Na 2 SO 4 D. NaSO 2 32. Which of the following is an empirical formula? A. N 2 O 4 C. Hg 2 I 2 B. P 4 O 10 D. Al 2 O 3
33. What is the percent by mass of water in magnesium sulfate heptahydrate, MgSO 4 7H 2 O? A. 51.1% C. 61.9% B. 60.1% D. 95.5% 34. What is the percent by mass of carbon in oxalic acid, H 2 C 2 O 4? A. 13.3% C. 26.7% B. 17.2% D. 33.3% 35. How many atoms of hydrogen are in one molecule of glycerin, C 3 H 5 (OH) 3? A. 8 atoms C. 1.20 x 10 24 atoms B. 14 atoms D. 4.82 x 10 24 atoms 36. How many atoms of hydrogen are in 0.25 mole of glycerin, C 3 H 5 (OH) 3? A. 8 atoms C. 1.20 x 10 24 atoms B. 14 atoms D. 4.82 x 10 24 atoms 37. When the equation is balanced, what will be the coefficient in front of oxygen, O 2? C 2 H 2(g) + O 2(g) CO 2(g) + H 2 O (l) A. 2 C. 5 B. 3 D. 10 38. Which set of coefficients will balance this equation? ZnS (s) + O 2(g) ZnO (s) + SO 2(g) A. 2:2:2:1 C. 4:4:4:2 B. 2:3:2:2 D. 3:2:3:1 39. Which product is missing from this equation? NH 4 Cl + Na 2 CO 3 (NH 4 ) 2 CO 3 + A. Na 2 Cl C. NaCl B. Na 2 Cl 2 D. ClNa 2 40. Which are the products of complete combustion of hydrocarbons? A. H 2 and CO 2 C. H 2 O and CO 2 B. H 2 and H 2 O D. C, H 2, and O 2 41. Dysprosium oxide, Dy 2 O 3, reacts with hydrochloric acid, HCl, to produce only water and: A. Dy 2 Cl 3 C. DyCl 3 B. Dy 2 Cl D. DyCl 42. How many moles of oxygen gas are needed for the complete combustion of one mole of propane? C 3 H 8 + O 2 CO 2 + H 2 O (unbalanced equation) A. 2 C. 4 B. 3 D. 5
43. What type of reaction is: 2Mg + O 2 2MgO A. decomposition C. combustion B. synthesis D. single displacement 44. What mass of hydrogen gas is required to prepare 96.0 grams of methanol, CH 3 OH, by the reaction: CO + 2H 2 CH 3 OH? A. 3.00 g C. 6.00 g B. 3.33 g D. 12.0 g 45. Consider the equation: N 2 + 3H 2 2NH 3 : How many grams of ammonia will be produced from 7.0 moles of hydrogen gas? A. 4.7 g C. 79 g B. 65 g D. 83 g 46. What is the percent yield of nitrogen monoxide if 4.0g of oxygen creates 2.6g of the product NO? 4NH 3 + 5O 2 4NO + 6H 2 O A. 55.4% C. 90.3% B. 65.0% D. 95.4% 47. Which element has luster, is ductile, and is malleable at room temperature? A. Cu B. Si C. Xe D. C 48. What kind of bond is present in a substance that conducts electricity only when melted or when it is dissolved in water? A. metallic B. ionic C. covalent D. hydrogen 49. Which of the following is covalently bonded? A. AlCl 3 B. KBr C. PCl 3 D. CuO 50. What is the shape of the arsenic dichloride, AsCl 3, molecule? A. trigonal planar C. triganol pyramidal B. bent D. tetrahedral