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| measurement of some aspect of nature |
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| a tentative inperpretation or explanation of the observations |
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| brief statement that synthesizes past observations and predicts future ones |
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| a proposed explanation for observations and laws |
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a way of learning that emphasizes observation and experimentation- to understand the world |
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| All of the above are true. |
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| A good hypothesis is falsifiable. |
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| Hypotheses are tested by experiment. |
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One or more hypotheses form the basis for a scientific theory.
True/False
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| atoms or molecules pack closely in fixed locations. |
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Which of the following is a pure substance?
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Which of the following is a homogeneous mixture?
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Which of the following is a chemical change?
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Which of the following is an example of a physical property?
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| the density of solid gold |
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Which of the following best defines kinetic energy?
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| Kinetic energy is the energy of motion. |
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Which of the following is true?
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| In any process, the total quantity of energy involved is constant. |
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Which is the longest distance?
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Which of the following is the highest temperature?
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| All are the same temperature. |
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The two objects shown below have the same mass. Which has the largest density?
[image]
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Which of the following is an example of an extensive property?
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How many mL of bromine are required to deliver 0.25 g of bromine into a reaction?
(dBr = 3.12 g/cm3)
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0.080 mL
volume = mass/density = 0.25 g/ (3.12 g/ cm3) |
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Which of the following numbers are exact?
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| both the first and second choices |
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Which of the following has the largest number of significant figures?
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How many significant figures should be reported for the following calculation:
5.2110 × 12.20 ÷ (11.44 – 2.113)
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A student made the following measurements in lab. Which of the following can be said for certain?
Trial 1 2.125 g
Trial 2 2.123 g
Trial 3 2.127 g
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Physical world of chemistry
Matter is anything that occupies space and has volume.
Matter can be quantified by measuring density (density = mass/volume) |
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Where can you find chemicals?
(a) in a hardware store
(b) in a chemical stockroom
(c) all around you and even inside you
(d) all of the above |
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Which statement best describes chemistry?
(a) the science that studies solvents, drugs, and insecticides
(b) The science that studies the connections between the properties of matter and the particles that compose that matter
(c) the science that studies air and water pollution
(d) The science that seeks to understand processes that occur only in chemical laboratories |
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| B. The science that studies the connections between the properties of matter and the particles that compose that matter |
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According to the scientific method, what is a law?
(a) A short statement that summarizes a large number of observations.
(b) A fact that can never be refuted
(c) A model that gives insight into how nature is
(d) An initial guess with explanatory power |
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| A. A short statement that summarizes a large number of observations. |
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Which statement is an example of an observation?
(a) In a chemical reaction, matter is conserved
(b) All matter is made up of atoms
(c) When a given sample of gasoline is burned in a closed container, the mass of the container and its contents does not change
(d) Atoms bond to one another by sharing electrons |
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| C. When a given sample of gasoline is burned in a closed container, the mass of the container and its contents does not change |
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Which characteristic is necessary for success in understanding chemistry?
(a) Curiosity
(b) calculation
(c) commitment
(d) all of the above |
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