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CH 1 HW PART 2: MUST COMPLETE TO REMAIN IN CLASS Due: 11:59pm on Sunday, September 3, 2017 To understand how points are awarded, read the Grading Policy for this assignment. Exercise 1.1 Part A Why does soda fizz? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. ANSWER: Correct Exercise 1.2 Part A What are chemicals? ANSWER: Correct Part B Give some examples of pure chemical substances. ANSWER: Help Reset carbon monoxide increased decreased carbon dioxide Soda contains carbon dioxide molecules that are forced into a mixture with water molecules because of the increased pressure. Opening the can of soda will release the pressure, which allows the carbon dioxide to escape from the mixture and form bubbles. Chemicals are what make up everything around us, including ourselves. Chemicals are inorganic substances. Chemicals are poisons (e. g. insecticides). Chemicals are the substances which are used in agriculture. Soda water and brass. Sugar, carbon dioxide and water. Bronze and brass. Gasoline.
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Correct Exercise 1.4 Part A What is meant by the statement, "Matter does what molecules do"? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. ANSWER: Correct Part B Choose an example. ANSWER: Correct Exercise 1.6 Part A How is chemistry connected to everyday life? Check all that apply. ANSWER: Help Reset different activity of the Moon similar the behavior of the molecules the weather the time of the day Because matter is made up of molecules, the behavior of matter is dictated by the behavior of the molecules . If the molecules were different , matter would be different. when pressure increases water evaporates when pressure decreases water freezes water expands when it freezes water expands when it melts
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Correct Part B How is chemistry relevant outside the chemistry laboratory? ANSWER: Correct ± The Scientific Method Learning Goal: To apply the scientific method. The scientific method is a way of acquiring knowledge to understand the world around us. The scientific method involves the use of observation and experimentation to further knowledge about the world. Observations lead to the development of a hypothesis . A hypothesis is a tentative explanation or interpretation of an observation. A good hypothesis should be falsifiable or, in other words, should have the potential to be shown to be false through further testing. Hypotheses are tested through the use of experiments . An experiment is a tightly controlled test, trial, or procedure in which observations are made in order to validate or invalidate a hypothesis. A number of consistent observations can be formulated into a scientific law that characterizes past observations and predicts future observations. Over time, well- established hypotheses may form theories that go beyond scientific law to try to explain why observations occur.
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