Mrs. Rosinski-Bailey's Classes | Round Rock High School On ...



Physical and Chemical Properties of Matter PracticeAccuracy, Precision, and Percent Error (Use with Notes Unit 1 Page 2)1. The following measurements were made to determine the density of a material whose value was, according to the Handbook of Chemistry and Physics, 1.24 g/mLTrial #1: 1.20 g/mL, Trial #2: 1.22 g/mL, Trial #3: 1.22 g/mLa. Make a general comment on the accuracy of these results and on the precision of these results.b. Use the average of the three trials as the “measured value” and determine the numerical value for the percent error.2. The following measurements were made to determine the density of a material whose value was, according to the handbook of Chemistry and Physics, 1.15 g/mLTrial #1: 0.95 g/mL, Trial #2: 1.16 g/mL, Trial #3: 1.26 g/mLa. Make a general comment on the accuracy of these results and on the precision of these resultsb. Use the average of the three trials as the “measured value” and determine the numerical value for the percent error.3. In a chloride ion determination experiment, assume that when you titrated 50.0 mg/L standard chloride solution you got 46.2 mg/L. Calculate your percent error.4. Two technicians independently measure the density of a substance. Technician A records values of 2.000, 1.999, and 2.001g/mL. Technician B records values of 2.5, 2.9, and 2.7g/mL. According to a reference table, the accepted density for the substance is 2.71g/mL. Which technician’s measurements are more precise? Explain. Which technician’s measurements are more accurate? Explain. 5. A 250.0 gram block is placed on a balance. The balance measures the mass of the block as 243.9 grams. What is the percent error of the block?6. A teacher calculates the molar mass of sodium hydroxide as 37 g/mol. The true molar mass of sodium hydroxide is 40 g/mol. Find the teacher’s percent error.7. There are 34 questions on a test. John answers 22 of them correctly. What is John’s percent error?8. You bought a new car and estimated that your monthly payment would be $312. However, your actual payment amount is $325. How much error was in your estimate?Significant Figures Practice (Use with Notes Unit 1 Page 3 and 4)Directions: Determine the number of significant figures in the following measurements.1 640 cm3 6 20.900 cm 2 200.0 mL7 0.00000056 g/L30.5200 g 8 0.04002 kg/m3 4 1.005 kg 9 790001 cm2 5 10,000 L 10 665.000 kg?m/s2Directions: Perform the following calculations and express the results in the correct units and number of significant figures. Remember, the point is to figure out how to properly round your answers! 11 47.0m ÷ 2.2s 15 22.0m + 5.28m + 15.5m 19 (0.054 kg + 1.33 kg) × 5.4 m212 140cm × 35cm 16 0.042kg + 1.229kg + 0.502kg 20 67.35 cm2 ÷ (1.401 cm – 0.399 cm)13 5.88kg ÷ 200m3 17 170cm2 + 3.5cm2 – 28cm2 21 4.198kg × (1019m2 – 40m2) ÷ (54.2s × 31.3s)14 0.0050m2 × 0.042 m 18 0.003L + 0.0048L + 0.100L 22 3.14159 m × (4.17 m + 2.150 m)23 690 000 m ÷ (5.022 h – 4.31 h)24 (6.23 cm + 3.111 cm – 0.05 cm) × 14.99 cm Read the following to the correct number of significant figures.More practice: Determine the number of significant figures.1. 0.02 ________ 2. 142 ________ 3. 0.020 ________ 4. 0.073 ________ 5. 501 ________ 6. 1.071 ________ 7. 501.0 ________ 8. 10810 ________ 9. 5000 ________ 10. 5.00 ________ 11. 5000. ________ 12. 55.320 ________ 13. 6051.00 ________14. 1.010 ________ 15. 0.0005 ________16. 154 ________ 17. 0.1020 ________ 18. 8710 ________ 19. 10001 ________ 20. 1.0004 ________ 21. 88.473 ________22. 69.95 _________ 23. 8505 __________ 24. 0.000056794 _____ 25. 976450 ________ 26. 67.048 ________ 27. 699.5 __________ 28. 3.002 ___________ 29. 123.98 _________ 30. 0.0300 _________ 31. 0.00086321 _____ 32. 90100 ___________ 33. 12.17 _________ 34. 54.009 _________ 35. 8040 ____________Scientific Notation Practice (Use with Notes Pg 5)1. 8,800,000,000 mWhat is the coefficient for your response?b. What is the exponent for your response?2. 0.0015 kgWhat is the coefficient for your response?b. What is the exponent for your response?3. Write each of the following in scientific notation.a. 325 ___________________ b. 0.361 ____________________ c. 70 __________________ d. 0.0428 ___________________ e. 96,400 __________________ f. 0.00573 _________________ g. 5,921 __________________ h. 0.0005438 ___________________ i. 6,587,324,000 ________________ j. 0.00005673 _________________ k. 42.372 _________________ l. 0.507______________________ m. 2.538 _________________ n. 0.00483 _________________ o. 3,621.471 _________________ p. 0.0000000009 _________________ q. 362.515 _________________ r. 0.000421 _________________ 4. Write each of the following as ordinary numbers. (Watch for significant zeroes) a. 3.64 x104 _________________ b. 2.97 x10-4 __________________ c. 3.9734 x105 _________________ d. 3.88 x10-2 _________________ e. 6.285x103 _________________ f. 5.65 x10-1___________________ g. 6.7978x100 _________________ h. 3.7283 x 10-4 _________________ i. 5.8643 x102 _________________ j. 4.763x10-3 __________________ k. 2.9265 x 105 _________________ l. 5.9267 x 10-1 ___________________ m. 3.487 x103 _________________ n. 8.654 x 10-2 ________________ o. 2.9265 x105 _________________ p. 2.5417 x10-3 _________________ q. 8.7321 x 104 _________________ r. 9.865 x 10-5 __________________ 5. Round each of the following to four significant figures. a. 2.16347x105 ______________ b. 7.2513 _____________ c. 4.000574x105 ____________ d. 375.6523 ____________ 6. Round each of the following to the nearest hundredth. a. 54.7421 ____________ b. 79.2588 ____________ c. 100.0925 ____________ d. 0.9114 ____________ 7. 4.74×104km + 7.71×103km + 1.05×103km8. 4.0×10-3m3 + 6.85×10-6m3 – 1.05×10-5m39. 7.20×103cm × 8.08×103cm10. 2.290×107cm ÷ 4.33×103s11. 1.54x10-1L ÷ 2.36x10-4sConversions and Dimensional Analysis Practice (Use with Notes Pg 6)1. There are 365 days in 1 year. Write the conversion factor ratios for this relationship.2. There are 10 decimeters in 1 meter. Write the conversion factor ratios for this relationship.3. A student measures 5.20x105 cm of magnesium ribbon. Determine the length of ribbon in meters.4. A student has 4.35x1016 kilobytes of data stored on her computer. How many megabytes is this?5. A balloon contains 0.5m3 of helium gas. What is the volume of gas in cubic centimeters?6. Three weeks ago, Andres’s weight was two hundred eighty-five and two tenths kilograms. He has since lost nineteen thousand, five hundred grams. What is his current weight in kilograms?7. Michael was collecting chicken eggs on his farm. If he collected 29 chicken eggs, how many dozen eggs does Michael have?8. Convert 3,644 centimeters to meters.9. Convert 74.5 kilometers to meters. 10. Convert 3.4 kg to pounds (lbs). 1 lb = .454 kg11. How many mL are in a 20.0 oz soda bottle? 1 oz = 29.57 mL12. Susanna is 5.50 ft tall. What is her height in centimeters? 1 inch = 2.54 cm13. If we are in class for 1.5 hours, how many seconds are we in class? CHALLENGE: Part 1 While playing Pokemon Go I walked about 9,000 steps in 3 hours, managed to take over a gym, and caught a wild Golduck. Over the course of the whole day, I walked 22,000 steps for about 15.2 km. Because I have run some 5K races before, I know 5 km = 3.2 miles.?A) how many kilometers are in one mile?B) how many miles did I walk throughout the whole day?C) how many steps do I take for every kilometer I walk?D) how many miles did I walk in the 3 hour time period in which I took 9,000 steps?CHALLENGE: Part 2Pokemon Go measures your distance traveled for egg hatching in a way that is designed to discourage people from playing while driving. To do this, it checks how far you have traveled in a 60 second period and will not count that distance if it is greater than 300 m. So, if the fastest you can travel and have it still count toward your egg hatching is 300 m per second, how many miles per hour is that? (Hint: You will need your answer from CHALLENGE: Part 1 A)Classifying Matter Practice (Use with Notes Pg 7-13)1. Which of water, iron, ammonia, chromium, radon, and silicon are chemical compounds as opposed to elements?Achromium and waterBonly waterCradon and ammoniaDwater and ammonia Eiron and silicon2. An example of a heterogeneous mixture isAbronze.Bconcrete. Cbrass.D water.3. How is a mixture different from a compound?AParticles of a mixture are combined chemically.BComponents of a mixture can only be separated omponents of a mixture can be separated by physical means. DComposition of a mixture may be constant.4. Identify each of the following as: element (E), compound (C), heterogeneous mix (He) or homogeneous mix (Ho)a. Table salt _________b. Nitric acid (HNO3) _________c. Sugar _________d. Carbon Dioxide (CO2) _________e. Milk _________f. Air _________g. Nitrogen gas (N2) _________h. Zinc (Zn) _________i. Pulpy orange juice _________5. Could the following be separated using physical means? Why or why not?a. b. Physical/Chemical Properties/Changes Practice (Use with Notes Pg 14)Identify each of the following as a physical or chemical change and explain why. EXTENSION: Try to sketch what each change would look like for the particles!3378835160020 heat020000 heat1. You burn magnesium in oxygen using a Bunsen burner flame to form magnesium oxide.2Mg(s) + O2(g) → 2MgO(s)2. You add zinc to hydrochloric acid to form hydrogen gas, zinc chloride, and heat.2HCl(aq) + Zn(s)→ H2(g) + ZnCl2(aq) + heat3157855159385 heat020000 heat3. You combust hydrogen in oxygen using a burning splint to form water and heat.2H2(g) + O2(g) → 2H2O(g) + heat310324562865 magnet020000 magnet4. You separate iron from a mixture using a magnet.Fe(s) → Fe(s)315785563500 heat020000 heat5. You boil a beaker of water to form water vapor.H2O(l) → H2O(g)6. You mix calcium chloride with sodium carbonate to form calcium carbonate and sodium chloride.CaCl2(aq) + Na2CO3(aq) → NaCl(aq) + CaCO3(s)Classify the following properties as Physical (P) or Chemical (C) and Intensive (I) or Extensive (E)_______ _______ White phosphorous glows in the dark._______ _______White phosphorous ignites (lights on fire) easily._______ _______Graphite is a good industrial lubricant._______ _______Strontium reacts with water._______ _______Gallium has a melting point of about 86° Fahrenheit._______ _______Iron rusts when it is exposed to air._______ _______Diamonds are the hardest substance known to humankind._______ _______Silver is a good conductor of electricity.Density Practice (Use with Notes Pg 15)1. What is the density of a block of marble that occupies 287cm3 and has a mass of 869g?2. A piece of wood that measures 3.0 cm by?6.0 cm by 4.0 cm has a mass of 80.0 grams.?What is the density of the wood??(Volume = L x W x H)3. Would the piece of wood described in question #2 float in water?4. When a piece of metal with a mass of 99.43g is dropped into a graduated cylinder containing 23.55mL of water, the water level rises to 28.84mL. What is the density of the metal?5. A cup of gold colored metal beads was measured to have a mass?425 grams.?By water displacement, the volume of the beads was calculated to be 48.0 cm3.?Given the following densities, identify the metal.AGold: 19.3 g/mLBCopper:?8.86 g/mLCBronze:?9.87 g/mLDLead: 11.37 g/mL ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download