EXAM1Review - Chem 109 EXAM 1 Review Sheet Spring 2008 Week...

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Chem 109 EXAM 1 Review Sheet Spring 2008 Week 1: Chapter 1 Key Topics: Matter – phases Chemical and Physical Properties Compounds, Mixtures, and Solutions: Homogenous and Heterogeneous Measurement Unit Conversions – common metric Temperature Density Significant Figures/Rounding Rules Suggested Information for your STP sheet: (These are merely suggestions – they do not have to go on your sheet and you may wish to put other things on it as well. Remember it must be written in your own handwriting.) Periodic Table names of groups of elements/ metals, non-metals, metalloids – NOT on the periodic table portion of your STP common metric unit conversions and temperature conversions density = mass/Volume Significant figure and rounding rules Extra Problems: 1. Remembering that measured values are reported to +/- 1 uncertainty in the last digit, except for those values determined by counting observable objects, or unless otherwise stated, determine the first uncertain digit in each of the following numbers: a) 10.03 kg; b) 5 apples; c) 5.02 +/- 0.02 m 2. The precision of a measurement is indicated by the number of significant figures associated with the reported value. How many significant figures does each of these numbers have: a) 225; b) 10,004; c) 0.0025; d) 1.0025; e) 0.002500; f) 14,100; g) 14,100.0? 3. Round to correct sig figs: a) 12.25 + 1.32 + 1.2 = 14.770 b) 13.7325 – 14.21 = - 0.4775 c) (1.256)(2.42) = 3.03952 d) 16.231/2.20750 = 7.352661 e) (1.1)(2.62) (13.5278)/2.650 = 14.712121 4. Convert 10.5 L to milliliters. 5. The Empire State Building in New York City was for many years the tallest building in the world. Its height, including the television mast added in 1951, is 490.7 yd. Convert this distance to meters. There are 3.281 ft in 1 meter. 6. The temperature on a spring day is around 22 o C. What is this temperature in degrees Fahrenheit and degrees Kelvin? 7. At 20 o C, carbon tetrachloride and water have densities of 1.60 g/mL and 1.00 g/ mL, respectively. When water and carbon tetrachloride are poured into the same container, two layers form, one being water and the other carbon tetrachloride, because they do not mix together permanently. Based on their densities, which one will occupy the lower layer in the container? 8. Which as the greater mass, 2.0 cm 3 of iron (d = 7.9 g/cm 3 ) or 1.0 cm 3 of gold
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(d=19.32 g/cm 3 )? 9. Are the following changes physical or chemical? a) the vaporization of solid carbon dioxide; b) the explosion of TNT; c) the aging of an egg with a resultant unpleasant smell; d) the formation of a solid when honey is cooled? 10. Classify each of the following as an element, compound, or mixture: a) a 100 % silver coin; b) wine; c) gasoline; d) carbon dioxide (CO 2 ). 11. Identify these elements as metals, non-metals, or metalloids. a) Ti b) Te c) Se d) Sc e) At f) Ar 12. What units do these abbreviations stand for? a) μ g b) dm c) ps d) kA e) mmol 13. What is the volume (in cm 3 ) of 1.000 lb of gold? 14. How much total blood cholesterol in grams does a person have if the normal blood volume is 5L? Normal human blood has a cholesterol concentration of about 200 mg/ 100 mL.
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