 # Directions: Express answers to the correct number of significant fi...

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Directions: Express answers to the correct number of significant figures. Show all work. 1. Express the following numbers in proper scientific notation. A) 0.0000580900 B) 3809000 C) 0.0124 x 10-9 D) 202.00 2. Express the answers to the following problems in scientific notation with the correct number of sig figs: A) 6.000 x 40.0000 B) 30.447 + 6.79 3. Calculate the molar mass of calcium phosphate Ca3(PO4)2 4. Carry out the following conversions by DIMENSIONAL ANALYSIS. A) Convert: 8.23 x 1011 mg→kg B) How many moles of H2O are in a bottle that holds 500. g of water? 1.7800×1017 61.2+88.5 C) D) (8.000 x 1015) + (7.20 x 1016) C) What is speed of a train traveling 118 miles/hour in meters/second? D) Convert 0.000575 m3 → L E) Convert: 5.51 x 1017 nm → km F) What is the mass (in grams) of a single atom of Tin (Sn)? G) The pressure of a bike tire is 120. lbs/in2. Convert this to g/cm2? H) What mass of gasoline (in kg) are you putting in your car if fill up with 16.0 gallons? (Dgasoline = 0.671 g/mL) 5. What is the mass of aluminum needed to make an aluminum rod (cylinder) that is 4.85 m long with a radius of 6.25 mm? (V = r2L) 6. What length of copper wire with a diameter of 1.40 mm can be made from 1.85 kg of copper? 7. How many iron ball bearings (spheres) with a diameter of 3.00 mm can be made from 10.0 kg of an iron ore that is 47.0% iron? Assume all of the iron in the ore can be recovered from the refining process. (V = 4/3 r3) Directions: Express answers to the correct number of significant figures. Show all work. 1. Complete the following table for the neutral isotopes below: Isotope Name Cobalt – 64 Isotope Symbol 182Ta 73 Atomic # 20 Mass # 37 # protons # electrons # neutrons 18 20 2. Carry out the following conversions by DIMENSIONAL ANALYSIS. A) Convert: 2.33 x 105 L→dm3 B) What is the volume of 45.98 oz. of gold? (Density = 19.32 g/mL) C) What is speed of a bicycle traveling 25 mi/h in the units km/min? D) Convert 0.000323 nm3 → pm3 E) How many moles of aluminum nitrate are in 250. g of aluminum nitrate. 3. Provide the formulas of the following species: sodium sulfide nickel (II) phosphate hydroiodic acid aluminum hydroxide lead (II) oxide chromium (III) sulfite elemental fluorine periodate ion 4. Provide the names of the following species: KBr Na3P N2O Fe2O3 Ca(BrO2)2 SO3 MnO2 HNO2 Zn(NO3)2 CuSO4 SO32- 5. Write the symbol for each of the following ions: (a) the ion with a +1 charge, atomic number 55, and mass number 133 (b) the ion with 54 electrons, 53 protons, and 74 neutrons (c) the ion with atomic number 15, mass number 31, and a −3 charge (d) the ion with 24 electrons, 30 neutrons, and a +3 charge 6. Write the symbol for each of the following ions: (a) the ion with a +3 charge, 28 electrons, and a mass number of 71 (b) the ion with 36 electrons, 35 protons, and 45 neutrons (c) the ion with 86 electrons, 142 neutrons, and a +4 charge (d) the ion with a 2+ charge, atomic number 38, and mass number 87 7. An element has the following natural abundances and isotopic masses: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99 amu, and 8.82% abundance with 21.99 amu. Calculate the average atomic mass of this element.

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