ICP 1 Unit 4 Post Test 94% – Flashcards
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"Highest molecular motion, highest kinetic energy, no forces of attraction, least dense packaging of molecules." Which state of matter is defined by this description?
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gas
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A puddle of water on the porch disappears after a few days. Which statement justifies this phenomenon?
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the water gains energy from the sunlight and is converted to vapor
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What changes occur at the molecular level when ice cream melts and forms a liquid?
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The motion of the molecules increases.
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What change would occur in the kinetic energy of vapor if a container of vapor is placed at 0 Kelvin?
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The gas particles will have no kinetic energy.
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Which is an example of kinetic energy?
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wind
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What is 200 kelvin in Celsius?
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-73 degrees Celcius
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Imagine yourself taking a position at a racecourse, ready to run as soon as you hear the gunshot. Which energy conversion occurs when you start running?
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potential energy gets converted to kinetic energy
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What is 100 degrees Celsius on the kelvin scale?
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373 Kelvin
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Which is an example of an exothermic process?
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condensation of steam
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What type of process occurs when solidified wax is converted to liquid wax on heating?
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endothermic
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How does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed?
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the value of q is positive
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Why is photosynthesis an endothermic reaction?
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A large amount of energy is required to activate the reaction.
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What does the kinetic theory state about the relationship between the speed and temperature of gas molecules?
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As the temperature increases, the speed of gas molecules increases.
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Consider two gases—oxygen and nitrogen at STP. How will the kinetic energy of the gases be affected if we only increase the temperature of oxygen?
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Oxygen will have more kinetic energy than nitrogen.
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Which statement is true according to the kinetic theory?
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Molecules of different gases with the same mass and temperature always have the same average kinetic energy.
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Which property of gases allows them to be stored at high concentrations in a bottle of air freshener?
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compressibility
