Chemistry A Answers – Flashcards
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Which field of science studies the composition and structure of matter?
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Chemistry
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The study of chemicals that, in general, do not contain carbon is traditionally called what type of chemistry?
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Inorganic
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Which of the following best describes an example of pure chemistry?
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Studying chemicals containing carbon
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Which of the following is NOT an example of chemistry research in the main area of energy?
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Producing hook-and-loop tape
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Which of the following is an example of a current research focus in chemistry?
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Applying gene therapy to treat certain diseases
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Which of the following can be observed only in microscopic view?
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Structure of a muscle cell
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Which of the following was a major contribution to chemistry by Antoine Lavoisier?
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He showed that oxygen is required to burn
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One characteristic of a scientific theory is that...
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it can never be proved
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The variable that is observed during an experiment is called what type of variable?
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Responding
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Collaboration and communication are important in science because...
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they increase the likelihood of a successful outcome
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Which step in the scientific method requires you to use your senses to obtain information?
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Making an observation
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Which of theses steps should always be followed fro effective problem solving?
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Developing a plan and then implementing the plan
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List and describe the two steps for solving conceptual problems.
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For solving conceptual problems, the two steps involved are "analyze" and "solve." In analyze, you need to determine the "relevant concepts" - like what information is given to help solve the problem. Lastly, in solve, you apply concepts to help determine the most efficient way to discover the unknown or the information that is being asked for.
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How do conceptual problems differ from numeric problems?
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Solutions to conceptual problems normally do not involve calculations.
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How many traditional areas of study can chemistry be divided into?
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There are 5 traditional areas of chemistry: organic, inorganic, biochemistry, analytical, and physical.
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The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific notation?
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1.54 x 10^-10 m
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What is the result of multiplying 2.5 x 10^10 by 3.5 x 10^-7?
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8.75 x 10^3.
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The closeness of a measurement to its true value is a measure of its
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accuracy
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Which of the following measurements contains two significant figures?
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0.0000 44 L
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In the measurement 0.503 L, which digit is the estimated digit?
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3
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When multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in
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the least precise measurement
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What is the quantity 0.0075 meters expressed in centimeters?
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0.075 cm
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Which of the following equalities is NOT correct?
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10 kg = 1 g
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A cubic meter is about the same as the volume occupied by a
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washing machine
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The expression of 5008 km in scientific notation is
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5.008 x 10^3
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Which of the following measurements (of different masses) is the most precise?
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3.000 000 g
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How many significant figures are in the measurement 40,500 mg?
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Three
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Express the sum of 1111 km and 222 km using the correct number of significant digits.
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1333 km
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What is the metric system prefix for the quantity 0.000 001?
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micro-
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What is the density of an object having a mass of 8.0 g and a volume of 25 cm^3?
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0.32 g/cm^3
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If a liter of water is heated from 20 C to 50 C, what happens to its volume?
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The volume increases
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If the temperature of a piece of steel decreases, what happens to its density?
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The density increases
