1. Bell Work Mr. Ingle

5. Pop Quiz for 3/17/11 1. What is the molar mass of nitric acid, HNO 3 ? a) 36.0g b) 83.0gc) 63.0gd) 38.0g 2. How many liters is 456mL? a).456L b) 4.56Lc) 456000L d).0456L 3. What is the concentration (in M) of 256g of a nitric acid solution that has the molar mass from problem #1 and the volume from #2? a) 8.19Mb) 9.18Mc) 9.81Md) 8.91M

6. Bell Work for 2/24 1. What is the molar mass of sulfuric acid, H 2 SO 4 ? a) 98.1g b) 89.1gc) 18.9gd) 19.8g 2NaOH + H 2 SO 4  Na 2 SO 4 + 2H 2 O 2. Using the balanced chemical equation above, how many grams of water can be produced from reacting 326.3g of sulfuric acid? a) 179.1g b) 197.1gc) 119.7gd) 117.9g

7. Bell Work for 2/22 1. What is the molar mass of sodium hydroxide, NaOH? a) 39.1g b) 39.0gc) 40.0gd) 93.0g 2NaOH + H 2 SO 4  Na 2 SO 4 + 2H 2 O 2. Using the balanced chemical equation above, how many grams of sodium sulfate can be produced from reacting 326.3g of sodium hydroxide? a) 579.6g b) 759.6gc) 597.6gd) 576.9g

8. Bell Work for 2/17(must show work) 1. What coefficients balance the following chemical equation? BaCl 2 + Al 2 O 3  BaO + AlCl 3 a) 3,1,2,3b) 4,12,10,8c) 1,3,2,3d) 3,1,3,2 2. What is the molar mass of barium chloride, BaCl 2 ? a) 208.3g b) 280.3gc) 203.8gd) 244.3g 3. How many moles are in 2536.4 g of barium chloride, BaCl 2 ? a) 12.0 moles b) 21.2 moles c) 12.2 moles d) 528332.1 moles

9. Bell Work for 2/16(to be turned in) 1. What coefficients balance the following chemical equation? Fe + O 2 -> Fe 2 O 3 a) 4,3,2b) 4,8,6c) 4,2,3d) 2,3,2 2. What is the molar mass of strontium fluoride, SrF 2 ? a) 152.6g b) 521.6gc) 125.6gd) 126.5g 3. How many grams are in 3.51 x 10 24 molecules of carbon disulfide, CS 2 ? a) 5.83gb) 444.3gc) 443.4gd) 434.3g

10. Bell Work for 2/15(to be turned in) 1. What coefficients balance the following chemical equation? C 5 H 12 + O 2 -> CO 2 + H 2 O a) 2,8,5,6b) 1,8,5,6c) 1,8,4,6d) 8,1,5,6 2. What is the molar mass of cadmium fluoride, CdF 2 ? a) 154.0g b) 510.4gc) 105.4gd) 150.4g 3. How many moles are in 2.29 x 10 25 molecules of carbon tetrachloride, CCl 4 ? a) 38.0 moles b) 30.8 moles c) 83.0 moles d) 5858 moles

11. Bell Work for 2/14(Turn in for credit) 1. What is the molar mass of calcium bromide, CaBr 2 ? a) 200.0gb) 199.9gc) 919.9gd) 190.9g 2. How many grams are in 6.75 moles of sulfur dioxide, SO 2 ? a) 433g b) 343gc) 334gd) 0.105g 3. How many moles are in 250 grams of potassium iodide, KI? a) 1.15 molesb) 5.11 moles c) 41500 molesd) 1.51 moles

12. Pop Quiz for 2/11 (no partial credit) 1. What coefficients balance the following chemical equation? Fe + H 2 O  Fe 3 O 4 + H 2 a) 3,1,4,4b) 3,4,1,4c) 3,4,4,1d) 6,1,4,4 2. What is the molar mass of Fe 3 O 4 ? a) 234.1g b) 321.4gc) 231.4gd) 241.3g 3. How many grams are in 2.25 moles of Fe 3 O 4 ? a) 521g b) 512g c) 103g d) 307g

13. Bell Work for 2/10 1. What coefficients balance the following chemical equation? C 4 H 8 + O 2 -> CO 2 + H 2 O a) 2,6,5,4b) 4,12,10,8c) 1,6,4,4d) 6,1,4,4 2. What is the molar mass of sulfur trioxide, SO 3 ? a) 80.1g b) 82.1gc) 88.3gd) 144.3g 3. How many moles are in 22.9 g of potassium chloride, KCl? a) 0.370 moles b) 0.703 moles c) 1708 moles d) 0.307 moles

14. Bell Work for 2/7 1. How many grams are in 7.5 moles of lithium fluoride, LiF? a) 149gb) 286gc) 419gd) 194g 2. How many moles are in 69.3 grams of sulfur dioxide, SO 2 ? a) 1.05 moles b) 1.08 moles c) 1.80 molesd) 5.00 moles 3. How many grams are in 22 moles of potassium chloride, KCl? a) 1607gb) 1670gc) 1641gd) 1706g

15. Bell Work for 2/2 1. How many grams are in 7.5 moles of potassium carbonate, K 2 CO 3 ? a) 1306gb) 1037gc) 138.2gd) 63.2g 2. How many formula units are in 296.4 grams of aluminum sulfate, Al 2 (SO 4 ) 3 ? a) 2.35 x 10 23 f.u. b) 4.56 x 10 24 f.u. c) 9.63 x 10 22 f.u.d) 5.21 x 10 23 f.u. 3. How many moles are in 4.5 x 10 24 molecules of carbon dioxide, CO 2 ? a) 7.06 molesb) 7.60 moles c) 7.48 molesd) 7.84 moles

16. Bell Work for 2/1 1. How many grams are in 5.4 moles of sodium fluoride, NaF? a) 272gb) 826gc) 227gd) 722g 2. How many moles are in 3.01 x 10 25 molecules of sulfur dioxide, SO 2 ? a) 15.0 moles b) 4949g c) 51.0 molesd) 50.0 moles 3. How many grams are in 2.2 x 10 22 molecules of potassium iodide, KI? a) 6.07gb) 6.70gc) 6.90gd) 7.06g

17. Bell Work for 1/31 1. How many grams are in 5.7 moles of sodium bromide, NaBr? a) 587gb) 578gc) 0.0534gd) 758g 2. How many moles are in 1.2 x 10 25 molecules of silicon dioxide, SiO 2 ? a) 13.9 molesb) 1198g c) 19.3 molesd) 19.9 moles 3. How many grams are in 9.9 x 10 21 molecules of potassium sulfate, K 2 S? a) 36.3gb) 1.81gc) 8.11gd) 1.18g

18. Bell Work for 1/28 1. How many grams are in 6.9 moles of sodium bromide, NaBr? a) 714gb) 701gc) 0.633gd) 710g 2. How many moles are in 8.3 x 10 24 molecules of silicon dioxide, SiO 2 ? a) 828.6gb) 882.6g c) 13.8 molesd) 18.3 moles 3. How many grams are in 3.3 x 10 22 molecules of potassium sulfate, K 2 SO 4 ? a) 5.95gb) 9.55gc) 9.90gd) 9.06g

19. Bell Work for 1/27 1. How many grams are in 4.5 moles of sodium fluoride, NaF? a) 814gb) 191gc) 189gd) 891g 2. How many moles are in 3.4 x 10 25 molecules of silicon dioxide, SiO 2 ? a) 3349gb) 3394g c) 65.5 molesd) 56.5 moles 3. How many grams are in 3.3 x 10 22 molecules of potassium sulfide, K 2 S? a) 6.05gb) 6.50gc) 3.90gd) 5.06g

20. Bell Work for 1/21 1. How many moles are in 49.6g of hydrochloric acid (HCl)? a) 1.63 molesb) 1.36 moles c) 1.53 molesd) 0.736 moles 2. How many grams are in 7.2 moles of propane (C 3 H 8 )? a) 361.8 gb) 6.11 g c) 0.164 gd) 316.8 g

21. Bell Work for 1/20 1. Fractions are set up to be used as ________ _________ in order to change units? a) molar massb) atomic mass c) Atomic numberd) conversion factors 2. What is the molar mass for sucrose (table sugar- C 12 H 22 O 11 )? a) 342gb) 324gc) 176gd) 423g

22. Bell Work for 1/19 1. What is the molar mass for dinitrogen pentasulfide? a) 158.5gb) 185.8gc) 188.5gd) 201.6g 2. What is the particle name for an ionic compound? a) Element b) Formula unit c) Mole d) Molecule 3. What is the correct formula for potassium carbonate (K 2 CO 3) ? a) 120.4gb)140.2gc) 142.0g d) 410.2g

23. Bell Work for 1/5 1. What is the correct formula for dinitrogen pentasulfide? a) N 2 S 5 b) N 3 S 4 c) N 2 S 4 d) N 3 Cl 4 2. What is the correct name for P 3 O? a) Triphosphorus monoxide b) Diphosphorus diiodide c) Diphosphorus dioxide d) Diphosphorus pentaoxide 3. What is the correct formula for potassium carbonate? a) K(CO 3 ) 2 b) K 2 CO 3 c) K 2 (CO 3 ) 3 d) KCO 3

24. Bell Work for 12/13 1. Which of the following is the major problem with using nuclear power to produce electricity? a) too little energy is produced per gram of radioactive material b) greenhouse gases, like carbon dioxide, are harmful byproducts c) too much coal needs to be burned to operate them d) radioactive waste that is generated is difficult and dangerous to dispose of 2. Half-life is defined as the time required for half of ________________________________. a) a radioisotope’s nuclei to undergo radioactive decay b) two unstable nuclei to join into one larger, more stable nucleus c) one large nucleus to split into two small nuclei d) the atoms of a chemical reaction to rearrange themselves into new products 3. Radon-222 has a half-life of 4 days. A sample contains 100 g of Radon-222. How much will remain after 8 days? a) 12.5gb) 25.0gc) 50.0gd) 75.0 g

25. Bell Work for 12/7 1. Annie places a piece of zinc with a mass of 71.4 g into a graduated cylinder containing 20.0 ml of water. The water rises to 30.0 ml in volume. What is zinc’s density? a) 0.140 g/mlb) 1.43 g/ml c) 7.19 g/mld) 7.14 g/ml 2. A 7.5g piece of metal is placed in a graduated cylinder that contains water. It is found that the water is displaced 1.5 ml. What is the density of the metal? a) 1.0 g/mlb) 2.0 g/ml c) 5.0 g/mld) 0.4 g/ml

26. Bell Work for 12/6 1. What is the correct formula for trinitrogen tetrasulfide? a) N 2 S 5 b) N 3 S 4 c) N 2 S 4 d) N 3 Cl 4 2. What is the correct name for P 2 O 5 ? a) Triphosphorus monoxide b) Diphosphorus diiodide c) Diphosphorus dioxide d) Diphosphorus pentaoxide 3. What is the correct formula for magnesium hydroxide? a) MgOH 2 b) Mg 2 OH c) MgOH d) Mg(OH) 2

27. Bell Work for 12/3 1. A bond in which electrons are shared between atoms is known as a ______ bond. a) covalentb) polarized c) ionic d) metallic 2. The compound NO 2 has which kind of bonding? a) ionic b) covalent c) metallic d) polarized 3. Which of the following is the correct chemical formula for the named compound? a) Potassium nitrate K 2 NO 3 b) Lithium sulfide LiS c) Calcium phosphate Ca 3 (PO 4 ) 2 d) Calcium carbonate Ca(CO 3 ) 2

28. Bell Work for 12/2 1. The correct name for the compound Ca 3 N 2 would be _________________. a) calcium nitriteb) nitrocalcium c) calcium nitrided) calcium nitrate 2. What is the correct formula for aluminum phosphite? a) Al 3 (PO 3 ) 2 b) Al 2 PO 3 c) Al 3 PO 3 d) AlPO 3 3. What is the correct name for the compound SCl 2 ? a) sulfur chlorideb) sulfur dichloride c) disulfur monochlorided) monosulfur dichloride

29. Bell Work for 12/1 1. What is the correct formula for dioxygen tetrachloride? a) O 2 Cl 5 b) OCl 4 c) O 3 Cl 4 d) O 2 Cl 4 2. What is the correct name for N 6 O 2 ? a) Heptanitrogen monoxide b) Hexanitrogen diiodide c) Hexanitrogen dioxide d) Dinitrogen hexaoxide 3. What is the correct formula for magnesium chloride? a) MgCl 2 b) Mg 2 Cl c) MgCl d) Mg 3 Cl 2

30. Bell Work for 11/30 1. What is the correct formula for dinitrogen pentoxide? a) N 2 O 5 b) N 5 O 2 c) N 6 O 2 d) N 2 O 6 2. What is the correct formula for aluminum phosphate? a) Al 2 PO 4 b) AlPO 4 c) Al 3 (PO 4 ) 3 d) ArPO 4 3. Which of the following substances is a non-metal? a) silicon b) magnesium c) oxygen d) aluminum

31. Bell Work for 11/18 1. What is the formula for magnesium phosphate? a) MgPO 4 b) Mg 3 (PO 4 ) 2 c) Mg 2 PO 4 d) Mg(PO 4 ) 2 2. Ba(NO 3 ) 2 is the correct formula for which of the following ionic compounds? a) Beryllium nitriteb) Barium nitride c) Barium nitrited) Barium nitrate 3. Ionic bonding involves the ______________ of electrons in order to create a bond. a) transferringb) pooling c) sharingd) none of the above

32. Bell Work for 11/16 1. The correct name for a compound Ca 2 N 3 would be _________________. a) calcium nitriteb) nitrocalcium c) calcium nitrided) calcium nitrate 2. In bonding, the goal is to get to ____ electrons, except for hydrogen, helium, lithium, beryllium, and aluminum. a) 8b) 18c) 2d) 32

33. Bell Work for 11/9 1. What is the charge for an ion with 35 protons, 45 neutrons, and 36 electrons? a. +3b. +1c. -1d. 0 2. What happens to elements in Group 2A/2 when they become stable? a. they lose 1 electrons and become a +1 ion b. they lose 2 electrons and become a +2 ion c. they gain 2 electrons and become a +2 ion d. they are already stable

34. Bell Work for 11/4 1. Which group on the periodic table has a full outer energy level and its elements have no or low reactivity? a. 2Ab. 8Ac. 7Ad. 4A 2. Which element has the electron configuration 1s 2 2s 2 2p 1 ? a. Cb. Alc. Bed. B 3. Which of the following electron configurations represents an element from group 5A? a. 1s 2 2s 2 2p 3 b. 1s 2 2s 2 2p 4 c. 1s 2 2s 2 2p 5 d. 1s 2 2s 2 2p 6

35. Bell Work for 11/3 1. How many valence electrons does group 4B have? a. 2b. 8c. 3d. 4 2. Which element has the electron configuration 1s 2 2s 2 2p 6 3s 2 3p 4 ? a. Sib. P)c. Sd. Cl 3. Which of the following electron configurations represents stability? a. 1s 2 2s 2 2p 3 b. 1s 2 2s 2 2p 4 c. 1s 2 2s 2 2p 5 d. 1s 2 2s 2 2p 6

36. Bell Work for 11/1 1. How many valence electrons does group 4A have? a. 2b. 8c. 3d. 4 2. How many valence electrons does Helium (He) have? a. 2b. 8c. 3d. 4 3. What is the electron configuration for O? a. 1s 2 2s 2 2p 3 b. 1s 2 2s 2 2p 4 c. 1s 2 2s 2 2p 5 d. 1s 2 2s 2 2p 6

37. Bell Work for 10/19 1. What is the new isotope when Nb-97 undergoes alpha decay? a. Tc-101b. Y-89c. Y-93d. Nb-93 2. How much of a 250g sample of Pd-100 (half-life 3.6 days) remains after 7.2 days? a. 62.5gb. 125gc. 31.25gd. 16.125g 3. How much Th-227 did you start with if 7.5g of it remains after 3 half-lives? a. 15.0gb. 22.5gc. 30.0gd. 60.0g

38. Bell Work for 10/19 1. What is the new isotope when Ta-183 undergoes beta decay? a. Hf-183b. W-184c. Re-181d. W-183 2. What is the new isotope when Gd-160 undergoes alpha decay? a. Gd-156b. Sm-156c. Dy-164d. Tb-164 3. Half-life is defined as the time required for half of _______. a. a radioisotope’s nuclei to undergo radioactive decay b. two unstable nuclei to join into one larger, more stable nucleus c. one large nucleus to split into two small nuclei d. the atoms of a chemical reaction to rearrange themselves into new products

39. Bell Work for 10/18 1. Gamma emission is combined with what type of decay? a. betab. toothc. alphad. plant 2. What is the new isotope when La-141 undergoes beta decay? a. Ce-141b. Ba-137c. Ba-141d. Ce-140 3. What is the new element when Pa-235 undergoes alpha decay? a. Np-239b. Ac-227c. Th-231d. Ac-231

40. Bell Work for 10/15 1. Which type of nuclear radiation can pass through pieces of paper and wood but be slowed down by a block of lead? a) alphab) deltac) gammad) beta 2. Which type of radiation is represented by a helium nucleus and can be stopped by a piece of paper or light clothing? a) alphab) deltac) gammad) beta 3. Which of the following is the major problem with using nuclear power to produce electricity? a) too little energy is produced per gram of radioactive material b) greenhouse gases, like carbon dioxide, are harmful byproducts c) too much coal needs to be burned to operate them d) radioactive waste that is generated is difficult and dangerous to dispose of

41. Bell Work for 10/7 1. Which is not located in the nucleus? a. protonb. electron c. positive charged. neutron 2. The identity of an atom is based on its __________. a. neutronsb. electrons c. charged. protons 3. What is the atomic number for nitrogen- 13? a. 13b. 6c. 7d. 0

42. Bell Work for 10/6 1. An atom has 19 protons and 20 neutrons. What is its mass number? a. 19b. 20c. 24d. 39 2. An neutral atom of an element, with atomic number 50 and mass number of 120, contains ____ protons, _______ electrons, and _____ neutrons. a. 50, 50, 70b. 70, 50, 50 c. 120, 50, 70d. 70, 70, 50 3. The number of protons in an atom is equal to the _____________. a. neutronsb. isotopes c. mass numberd. atomic number

43. Bell Work for 10/5 1. What is the smallest particle of an element that retains its properties? a. compoundb. atom c. iond. mixture 2. The mass number (or atomic mass) of an element is equal to _________________. a. number of electrons plus number of protons b. number of neutrons plus number of electrons c. number of neutrons plus number of protons d. number of protons minus the number of electrons

44. Bell Work for 9/28 1. If 45.0 grams of mercury oxide is broken down during heating, how much mercury is formed if 13.7 grams of oxygen is also formed? a) 38.9 gb) 58.7 gc) 31.3 gd) 33.1 g 2. What is the % by mass of the oxygen in question # 1? a) 30.4%b) 23.3%c) 69.6%d) 43.8% 3. Which is a compound? a) hydrogenb) sugar and salt c) kool aidd) carbon monoxide

45. Bell Work for 9/27 1. Which of the following substances is best described as a homogeneous mixture? a) copperb) salt water c) carbon dioxided) pepperoni pizza 2. Which of the following lists the states/phases of matter from highest to lowest kinetic energy? a) solid, liquid, gasb) liquid, gas, solid c) gas, liquid, solidd) solid, gas, liquid

46. Bell Work for 9/24 1. Which material is a pure substance? a. airb. teac. brassd. diamond 2. All are physical changes EXCEPT: a. bendingb. melting c. rustingd. boiling 3. A physical change occurs when a ___________. a. peach spoils b. copper bowl tarnishes c. glue gun melts a glue stick d. piece of toast burns

47. Bell Work for 9/23 1. Separating a mixture by the differences in their particle size as they pass through a porous barrier is the basis of what physical separation method? a. chromatographyb. distillation c. crystallizationd. filtration 2. The law of conservation of mass states that _______________________________________. a. Mass is neither created nor destroyed in any process b. Mass can disappear during a physical change c. Mass is created or destroyed during a chemical reaction d. Mass is rare, and needs to be conserved

48. Bell Work for 9/22 1. Which of the following is a solution? a. sand waterb. water c. Kool-aidd. rice and marbles 2. Which of the following is a physical property? a. produces gas b. produces odor c. ability to burnd. melts at 1ºC 3. Separating two liquids by differences in their boiling points is the basis of what physical separation method? a. chromatographyb. distillation c. crystallizationd. filtration

49. Bell Work for 9/21 1. Which of the following are the same? a) element and suspension b) pure substance and mixture c) homogeneous mixture and solution d) heterogeneous mixture and compound 2. Evidence that a chemical change has occurred is which of the following? a) melting, freezing, or boiling b) gas production, solid formation, or heat change c) dissolving of a solid d) expansion or contraction of a solid

50. Bell Work for 9/20 1. Changing state from a solid directly to a gas is called __________. a. sublimation b. freezingc. condensation d. deposition 2. Wafting is used to properly __________ a chemical. a. tasteb. seec. feeld. smell 3. Which of the following is a chemical change? a. A diamond is one of the hardest substances b. A bicycle rusting if it is left out in the rain. c. Gasoline will burn in your automobile. d. A copper being pulled into a wire

51. Bell Work for 9/16 1. What happens to the temperature of a substance when its state of matter is being changed from a liquid to a gas? a) increasingb) disappearing c) decreasingd) staying the same 2. What happens to the heat energy of a substance when its state of matter is being changed from a solid to a liquid? a) increasingb) disappearing c) decreasingd) staying the same

52. Bell Work for 9/15 1. The state of matter that has substances with variable shapes but definite volumes is the __________. a. solidb. liquidc. gasd. plasma 2. Matter is any substance that has mass and occupies ____________. a. timeb. distancec. spaced. gravity 3. Which of the following is a physical property? a. A diamond is one of the hardest substances b. A bicycle will rust if it is left out in the rain. c. Gasoline will burn in your automobile. d. A copper being pulled into a wire

53. Bell Work for 9/10 1. Which of the following is an example of a physical change? a) Apples spoiling after time in the sun b) Bread molding after becoming wet c) Copper being used to conduct electricity d) Zinc reacting with hydrochloric acid 2. A student wants to light a laboratory burner. The first thing to do is _______________. A. strike the match(striker) B. turn on the gas supply to the burner C. inspect the tubing supplying gas to the burner D. adjust the amount of gas coming into the burner

54. Bell Work for 9/9 1. Which phase/state of matter contains particles which vibrate, are tightly packed, and are highly ordered? a) gasb) liquidc) solidd) plasma 2. Choose the answer that lists only intensive physical properties a) Color, mass, density, and combustibility b) Color, smell, density, and freezing point c) Mass, weight, volume, and length d) Mass, weight, volume, and density 3. Which of the following does NOT indicate that a chemical change has occurred: a) shape changeb) a gas is produced c) the vessel becomes hotd) a color change

55. Bell Work for 8/31 1. Which metric prefix means 10 -3, 1/1000 or a thousandth? a) kilob) micro c) centid) milli 2. The metric system is a measurement system that bases its units on powers of ________. a) 100b) 3.14c) 10d) 1000 3. 1200 mg = ____________ g a) 0.12b)0.012c)1.2 d)12

56. Bell Work for 8/27 1. Determine the density of a cork that has a mass of 5.0 g. After dropping the cork into the graduated cylinder, the water level moved up from 20 ml to 35 ml. a) 0.333 g/ml b) 3.00 g/ml c) 0.300 g/mld) 15.0 g/ml 2. If 96.5 g of aluminum has a volume of 35.0 cm3, what is the density of aluminum? a) 3.19 g/cm3b) 2.36 g/cm3 c) 2.76 g/cm3d) 19.3 g/cm3

57. Bell Work for 8/26 1. Use the following table to answer this question. SampleMass(g)Volume(ml) W40.010.0 X24.08.0 Y33.011.0 Z60.012.0 Which 2 samples have the same density? a) W & X b) X & Yc) Y & Zd) W & Z 2. How do you correctly round 20,562 cm to two significant digits (figures)? a) 20 cmb) 21 cm c) 21,000 cmd) 20,000 cm

58. Bell Work for 8/25 1. Marcus places a piece of zinc with a mass of 35.7 g into a graduated cylinder containing 20.0 ml of water. The water rises to 25.0 ml in volume. What is zinc’s density? a) 0.140 g/mlb) 1.43 g/ml c) 7.19 g/mld) 7.14 g/ml 2. A 2.5g piece of metal is placed in a graduated cylinder that contains water. It is found that the water is displaced 0.5 ml. What is the density of the metal? a) 1.0 g/mlb) 2.0 g/ml c) 5.0 g/mld) 0.4 g/ml

59. Bell Work for 8/24 1. The number 0.0000799 is equal to _____________. a) 7.99 x 10 6 b) 7.99 x 10 -6 c) 7.99 x 10 5 d) 7.99 x 10 -5 2. 7.493 x 10 2 g is equal to _________. a) 749.3 gb) 7493 g c) 7.493 gd) 74.93 g

60. Bell Work for 8/19 1. How many liters is 35.9 milliliters? a) 0.0359b) 0.359 c) 0.00359d) 3.59 2. 0.03785 g would be equal to _________. a) 3785 mgb) 378.5 mg c) 37.85 mgd) 3.785 mg

61. Bell Work for 8/13 1. A number of people become ill after eating dinner in a restaurant. Which of the following statements is a hypothesis? a. Symptoms include nausea and dizziness b. The cooks felt really bad about it. c. People got sick whether the oysters were raw or cooked. d. Bacteria in the oysters may have caused the illness. e. Everyone who ate oysters got sick. 2. A hypothesis is a. a tentative explanation for a natural phenomenon b. a description of a pattern or relationship in experimental data c. a theory that has been proved d. obeyed under any circumstances.

62. Bell Work for 8/10 1. The variable that is expected to influence another variable during an experiment is called a. the explained variable. b. the independent variable. c. the response variable. d. the responsible variable. 2. Scientists usually design experiments a. with a good idea of the expected experimental results. b. based on wild guesses. c. in order to develop new laboratory tools. d. All of the above

63. Bell Work for 8/17 1. Students working in a lab were investigating the effect of temperature on the volume of a solid. As they increased the temperature, they observed that the volume of the solid also increased. In this experiment, which is the independent variable? a) volume of solidb) temperature c) the solidd) the lab 2. Which piece of lab equipment would be best to measure the volume of a liquid? a) rulerb) beaker c) graduated cylinderd) Erlenmeyer flask