New PDF release: Chemistry: The Science in Context (2nd Edition)

By Thomas R. Gilbert, Rein V. Kirss, Geoffrey Davies, Natalie Foster

ISBN-10: 0393926494

ISBN-13: 9780393926491

The moment variation of Chemistry offers an efficient and easy-to-remember problem-solving technique whereas putting the technology in organic, cosmological, geological, and environmental context.

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Extra info for Chemistry: The Science in Context (2nd Edition)

Example text

3 Hydrogen reacts with oxygen, producing water and releasing energy. Energy from this reaction propels the U. S. space shuttles. During liftoff, each of the five main engines of the shuttle consumes about 40 tons per minute of hydrogen and oxygen, which are stored in the large brown tank under the shuttle. Once in space, the electric power needs of the space shuttles are supplied by fuel cells energized by the same chemical reaction between hydrogen generated and oxygen. The water as a product of this reaction is used aboard the shuttle.

3, are always significant. CONCEPT TEST How many significant figures are there in each value in guidelines 1, 2, and 4 above? ) Significant Figures in Calculations Now let's consider how significant figures are used to express the results of calculations involving measured quantities. An important rule to remember is that significant figures should be enforced at the end of a calculation, never on intermediate results. A reasonable guideline to follow is that one digit to the right of the last significant digit should be carried forward in intermediate steps, and the rules about significant figures should be applied in expressing the final answer.

If, for example, you were to grind up a silicon chip into the finest dust imaginable, there would be a limit to how tiny a particle could be and still be silicon. That limit is an atom of silicon. Most elements occur in nature combined with other elements in the form of compounds. Just as elements are made of particles called atoms, compounds such as water are made of particles called molecules, which are a collection of atoms chemically bonded together in a characteristic pattern and proportion.

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Chemistry: The Science in Context (2nd Edition) by Thomas R. Gilbert, Rein V. Kirss, Geoffrey Davies, Natalie Foster

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