CH%201%20to%206%20problems-1

# CH%201%20to%206%20problems-1 - Sample Problems that are...

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Sample Problems that are relatively easy and cover chapters 1 through 6 material Many of these problems are easy but a good warm up. CHM 2045 exam problems are often 2 or 3 step problems. Students seems to find these difficult because they have not done enough problems to comfortable in solving our questions in 4 to5 minutes. CHM 2045 students should be able to do any of these problems in 4 minutes or less 1. A 52.5 lb bag of topsoil will cover 12 square feet to a depth of 1.5 inches. How many pounds of topsoil will be required to cover a plot 205 m by 315 m to a depth of 6.5 cm? 1) 5.19 x 10 6 lbs 2) 5.19 x 10 8 lbs 3) 9.88 x 10 4 lbs 4) 9.88 x 10 8 lbs 5) 7.98 x 10 5 lbs 2. Which of the following name formula pairs are NOT CORRECT? A) Lead (II) sulfate, PbSO 4 F) Calcium oxide, CaO K) Aluminum iodide, AlI 3 B) Phosphine, PH 3 G) Aluminum sulfite, Al 2 (SO 3 ) 2 L) Calcium floride, CaF 2 C) Nitric oxide, NO H) Lead (II) sulfite, PbSO 3 M) Potassium permanganate, KMnO 4 D) Manganese (IV) oxide, Mn 4 O 2 I) Cobalt (III) oxide, Co 2 O 3 N) Sodium chlorate Na 2 ClO 3 E) Ammonium acetate, NH 4 CH 3 CO 2 J) Beryllium phosphate. Be 3 (PO 4 ) 2 O) Ammonium carbonate, (NH 4 ) 2 CO 3 1) A, C, F 2) D, G, N 3) C, H, N 4) C, J, K 5) A, H, I 3. Magnesium has three isotopes: 24 Mg [23.985042 u], 25 Mg [24.985836 u] and 26 Mg [25.982593 u]. Knowing that the atomic mass of Magnesium is 24.31 u and the percent abundance of 24 Mg is 78.99%, calculate the percent abundance of 25 Mg. 1) 12.04 % 2) 11.51 % 3) 9.50 % 4) 6.25 % 5) 21.01 % 4. A package of aluminum foil contains 100 ft 2 and has a mass of 1 lb. Find the thickness of aluminum foil in mm. The density of Aluminum is 2.70g/cm 3 . Note: 1 lb= 45.36g. 1) 0.0018mm 2) 0.0046mm 3) 0.018mm 4) 0.0013mm 5) 0.46mm

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5. As part of an experiment to determine the density of a new plastic developer, you measure the volume of a solid sample. Your four trials yield volumes of 14.41cm 3 , 14.37 cm 3 , 14.38 cm 3 , and 14.39 cm 3 . Measurements of other scientists in the lab give an average volume of 14.61 cm 3 . Which of the following statements represents the best analysis of your data? 1.
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CH%201%20to%206%20problems-1 - Sample Problems that are...

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