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Welcome! The Topic For Today Is … SCIENCE SEC 4

Welcome! The Topic For Today Is … SCIENCE SEC 4. Your Topic. Topic 1: 200. Question: CO 2 has three types of atoms. Answer False. There are three atoms in all but only TWO types: carbon and oxygen. Back. Topic 1: 400. Question: A boiling point is NOT a characteristic property. Answer

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Welcome! The Topic For Today Is … SCIENCE SEC 4

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  1. Welcome! The Topic For Today Is… SCIENCE SEC 4

  2. Your Topic

  3. Topic 1: 200 • Question: • CO2 has three types of atoms. • Answer • False. There are three atoms in all but only TWO types: carbon and oxygen. Back

  4. Topic 1: 400 • Question: • A boiling point is NOT a characteristic property. • Answer • False. Back

  5. Topic 1: 600 • Question: • When chocolate melts it undergoes a physical change. • Answer • TRUE Back

  6. Topic 1: 800 • Question: • A characteristic property of oxygen is that it makes limewater cloudy. • Answer • False. That’s the characteristic of carbon dioxide. Back

  7. Topic 1: 1000 • Question: • Iron, zinc, oxygen, water and brine all have different densities. Thus, density is a characteristic property • Answer • TRUE Back

  8. Topic 2: 200 • Question: • A fish farmer wants to create a 100 000 L pond with a 30 g/L concentration of salt. How many kg of salt does he have to buy? • Answer • C=m/V then • m = CV = 30 g/L(100 000 L) = 3 000 000 g = 3000 kg Back

  9. Topic 2: 400 • Question: • For a different type of fish, he needs a concentration of only 200 ppm of salt. How many kg of salt does he have to buy for this other 100 000 L pond? • Answer • C=m/V then • m = CV = 200 mg/L(100 000 L) = 20 000 000 mg = 20 000 g =20 kg Back

  10. Topic 2: 600 • Question: • Describe what happens in a neutralization reaction. How could it be useful if a lake is so acidic that it • endangers fish and interferes with the development of their eggs? • Answer • Neutralization = acid + base =salt + water.Water is created form hydroxide(OH-) reactingwith H+ Back

  11. Topic 2: 800 • Question: • What name is given to periodic table elements that are semi-conductors of electricity and which do not react with acid? • Answer • metalloids Back

  12. Topic 2: 1000 • Question: • When some charcoal(C) burned, it reacted with 320 grams of oxygen gas (O2). If 440 g of CO2 were made, how many grams • of charcoal reacted? • Answer • C + O2  CO2 x + 320 = 440; x = 120 g Back

  13. Topic 3: 200 • Question: • From the point of view of their roles in the carbon cycle, what do rainwater and oceans have in common? • Answer • Both dissolve carbon dioxide and convert it to carbonic acid. • H2O + CO2  H2CO3 Back

  14. Topic 3: 400 • Question: • What is atmospheric pressure? • Answer • It is the weight of air acting on a unit area. Back

  15. Topic 3: 600 • Question: • What role does atmospheric pressure play in allowing us to breathe? • Answer • When we inhale, the volume of our chest cavity increases, decreasing the pressure. Then, with • less hindrance, atmospheric pressure can push the air into our lungs. Back

  16. Topic 3: 800 • Question: • Temperature increases with height due to increased absorption of ultraviolet radiation by the ozone layer, which restricts turbulence and mixing. While the temperature may be −60 °C (−76 °F; 210 K) at the tropopause, the top of this layer is much warmer, and may be near freezing • Answer • stratosphere Back

  17. Topic 3: 1000 • Question: • It begins at the surface and extends to between 9 km (30,000 ft) at the poles and 17 km (56,000 ft) at the equator, with some variation due to weather. It is mostly heated by transfer of energy from the surface, so on average the lowest part of this layer is warmest and temperature decreases with altitude • Answer • troposhere Back

  18. Topic 4: 200 • Question: • Give an example how sedimentary rock can be turned in to metamorphic rock? • Answer • Limestone can be converted into marble. Back

  19. Topic 4: 400 • Question: • Erosion of nitrate-rich rocks introduces nitrates into the soil. • Are these nitrates absorbed by plants? • Answer • yes Back

  20. Topic 4: 600 • Question: • Trace the energy that powers a TV in Quebec to theevaporation of water. • Answer • Light and sound come from electricity and digital signals • The electricity comes from a generator • The generator obtained its energy from moving turbines • Flowing water spun the turbines • Water flowed due to gravity • The sun’s energy was used to work against gravity as it caused thewater to evaporate and fallon higher ground. Back

  21. Topic 4: 800 • Question: • What releases more energy: 3 human beings whose body temperature is at 37.0 oC? Or a single 10 000 kg minke whale whose body temperature is 35.5 oC? Explain. • Answer • The whale does. Although it is at a slightly lower temperature, it is much heavier than the three people, and heat depends on both temperature and mass. Back

  22. Topic 4: 1000 • Question: • If a 100 W light bulb releases 4320 kJ in 12 hours, of which 600 kJ is heat, how efficient is it? • Answer • % efficiency = (𝒖𝒔𝒆𝒇𝒖𝒍 𝒆𝒏𝒆𝒓𝒈𝒚) ∗ 𝟏𝟎𝟎% = 𝟒𝟑𝟐𝟎−𝟔𝟎𝟎 ∗ 𝟏𝟎𝟎 % = ( (𝒕𝒐𝒕𝒂𝒍 𝒄𝒐𝒏𝒔𝒖𝒎𝒆𝒅) = 86% Back

  23. Topic 5: 200 • Question: • When an object such as a bed sheet becomes statically charged, what kind of atomic particles is it either gaining or losing? • Answer • Electrons. Protons do not move in physical or chemical changes. Back

  24. Topic 5: 400 • Question: • Calculate its power in kW. • The resistance of a certain battery-powered watch is 100 . It requires 3V batteries. • Answer • V = IR • 3 = I (100) • I = 0.03A • P = VI • = 3(0.03) = 0.09W = 0.00009 kW. Back

  25. Topic 5: 600 • Question: • Calculate the current drawn by a circuit with an overall resistance of 50 and a power rating of 0.100kW. • Answer • P = I2R • 100 W = I2 (50) I2 = 2 • I = 2 =1.14 A Back

  26. Topic 5: 800 • Question: • If a 240 V, 12 A heater is turned on for 2 minutes, how many joules of energy does it use up? • Answer • E=VIt= 240(12)(120)=345600J or 345.6kJ Back

  27. Topic 5: 1000 • Question: • For each set, choose the one which offers the more resistance • a wire 40 cm in length and 3 cm wide • wire 40 cm in length and 8 cm wide • Answer • a wire 40 cm in length and 3 cm wide___because it’s narrower and crowds electrons more. Back

  28. Daily Double The Winner Of The Last Round Write Down How Much Money You Are Willing To Risk If You get the Question write you win that money If you get it wrong you Loss the money!

  29. Daily Double The Winner Of The Last Round Write Down How Much Money You Are Willing To Risk If You get the Question write you win that money If you get it wrong you Loss the money!

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