Quiz_1_-_Summer_2008_-_Answer_Key

Quiz_1_-_Summer_2008_-_Answer_Key - Add Metal 36.2-mL QUIZ...

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QUIZ 1 CHEMISTRY 3 PAGE 1 OF 2 BE SURE TO SHOW ALL YOUR WORK CLEARLY! 1. Water was placed into a graduated cylinder until the volume read 25.0-mL. An irregularly shaped piece of metal weighing 50.8 g was placed in the cylinder and completely submerged. The water level rose to the 36.2-mL mark. What is the density of the metal in kg/L? Step 1 Write out a diagram for what is happening (See Above). Step 2 Write out the equation for density. density = mass (g) / volume (mL) d = m/v Step 3 Solve for Volume Volume the metal occupies Final Volume – Initial Volume Volume = (36.2 mL – 25.0 mL) = 11.2 mL Step 4 Solve for the density (d) in g/mL (50.8 g)/(11.2 mL) = 4.5 g/mL Step 5 Convert g/mL to kg/L – We know there are 1000 grams per kilogram and 1000 milliliters per liter (4.5g /mL )*(1 kg /1000g )*(1000mL / L ) = 4.5 kg/L 2. How many L is 6.85 mm 3 ? In: 6.85 mm 3 Out: L (6.85 mm 3 )*(1 3 cm 3 /(10) 3 mm 3 )*(1 mL /1 cm 3 )*(L/1000 mL ) = 6.85 x 10 -6 L NAME: Answer Key SECTION: 25.0-mL
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Unformatted text preview: Add Metal 36.2-mL QUIZ 1 CHEMISTRY 3 PAGE 2 OF 2 3. Write the following in scientific notation: (a) 84,000,000 8.4 x 10 7 (b) 0.0007868532 7.868532 x 10-4 (c) 864.200 8.642 x 10 2 (d) 5.8 5.8 x 10 4. Complete the following and give the number of significant figures: (a) 2 0.2354 1.7646 = 2 The number of sig figs is equal to the limiting decimal place 2 (b) 5.4 x 5.52 29.8 = 30. or 3.0 x 10 1 The number of sig figs is equal to the limiting number of sig figs (5.4 = 2) 5. Name the family to which each of the following elements belong: (a) Fe Transition Metal (b) Cl Halogen (c) Ar Noble Gas (d) Sr Alkaline Earth Metal (e) Na Alkali Metal (f) Cu Transition Metal 6. Identify the following as mixtures or pure substances (a) Wood Mixture (b) Aluminum foil Pure Substance (A element or a compound = pure substance) (c) Salad dressing Mixture (d) Wine Mixture...
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Quiz_1_-_Summer_2008_-_Answer_Key - Add Metal 36.2-mL QUIZ...

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