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Review. LT 1 on Wed (17 July) @ Bel 308 Bring your own calculator. Classify as mixture or pure substance, if a mixture, indicate if it is homogeneous or heterogeneous Air Tomato juice Iodine crystals. Air – mixture, homogeneous Tomato juice –mixture , heterogeneous

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Review

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  1. Review LT 1 on Wed (17 July) @ Bel 308 Bring your own calculator.

  2. Classify as mixture or pure substance, if a mixture,indicate if it is homogeneous or heterogeneous • Air • Tomato juice • Iodine crystals

  3. Air – mixture, homogeneous • Tomato juice –mixture, heterogeneous • Iodine crystals – pure substance

  4. A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has the same properties as the product obtained when carbon is burned in an excess of oxygen. Are solids A and B and the gas C elements or compounds?

  5. C and A are compounds. They both contain Carbon and Oxygen. B cannot be defined as an element or compound using the data given. It might be a compound.

  6. In the process of attempting to characterize a substance, a chemist makes the following observations: The substance is a silvery white, lustrous metal. It melts at 649 0Cand boils at 1105 0C. Its density at 20 0C is 1.738 g/cm3. The substance burns in air, producing an intense white light. It reacts with chlorine to give a brittle white solid. The substance can be pounded into thin sheets or drawn into wires. It is a good conductor of electricity. Which of these are physical and chemical properties?

  7. Physical Properties • Silvery white • Lustrous • Melting point • Boiling point • Density • Can be pounded into sheets • Can be drawn into wire • Good conductor Chemical • Burns in air • Reacts with Cl2

  8. Perform the following conversions • 454 mg to g • 5 X 10-9 m to mm • 3.5 x 10-2 mm to mm

  9. The density of air at ordinary atmospheric pressure and 25 0C is 1.19 g/L. What is the mass in kilograms of the air in a room that measures 12.5 x 15.5 x 8.0 ft? ( 1foot = 30.48 cm) Ans: 52 kg air

  10. Fill in the blanks

  11. Explain why the effective nuclear charge experienced by a 2s electron in boron is greater than that of the 2p electron. Which should experience the greater effective nuclear charge, a 2p electron in oxygen or a 2p electron in neon? Write the electron configuration of the following atoms • Rb • Se • Zn2+ • Cr3+

  12. Why did Mendeleev leave blanks in his early version of the periodic table? Which will have the highest effective nuclear charge? Na, Mg+, Al2+, Si3+

  13. Arrange in increasing atomic size • Rb, K, Cs • C, O, Be • Cl, K, S • Arrange in increasing IE • Sr, Ca, Ba • N, B, Ne • Br, Rb, Se • Which will have the highest IE2 • Na, Mg, Al • Na, K, Fe • Sc, Be, Mg

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