Exam 2: Science, matter, energy, and Systems

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Compounds are combinations of two or more different elements held together in ____________________ proportions.

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Radioactive decay is best characterized as a type of ____.

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What law states that when matter undergoes a physical or chemical change,no atoms are created or destroyed?

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When someone says that evolution is not important,"after all,it's just a theory," it is probable that they do not understand how scientists use the term "theory."

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A negative feedback loop causes a system to further change in the same direction.

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What is the point of a fundamental shift in the behavior of a system?

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The energy "lost" by a system is ____.

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Scientists classify energy as either ____.

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One property of a system is that it ____.

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Fossil fuels are best characterized as a type of ____.

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Science is based on the assumption that events in the natural world follow ____________________ patterns that can be understood.

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High-quality energy can best be characterized as ____.

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The scientific principles of sustainability show that everything we do affects someone or something in the environment in some way.

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Explain how the human body is intimately connected to the two laws of thermodynamics.

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Which statement is an example of a chemical change?

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Scientists estimate that about _____ of the energy used in the United States is unavoidably wasted.

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Electromagnetic energy travels in _____.

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What is the most basic building block of matter?

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How is the concept of an environmental threshold or tipping point important in regards to global warming?

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Scientists can disprove things but they cannot prove anything absolutely,which means there is always some uncertainty in science.

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