When water freezes, it can expand up to what percentage?
a. 9%
b. 29%
c. 59%
d. 79%
e. 99%
A
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Why is clay poor soil?
A. Clay particles pack so tightly there is little air in clay soil. B. It does not contain organic matter. C. It doesn't allow sufficient drainage. D. all of the above
Carbon-14 dating is based on the ratio of the parent isotope ____________________ to the daughter
isotope ____________________. Fill in the blank(s) with the appropriate word(s).
In 2010, approximately how many people were in the world?
A) 3.5 billion B) 4.5 billion C) 5.5 billion D) 6.5 billion E) 7.5 billion
A student discussing bond polarity and molecular polarity in alcohols made the following statements: (i) In methanol, CH3OH the H-O bond is more polar than the C-O bond. (ii) Ethanol, CH3CH2OH, the alcohol of alcoholic beverages, has at least one polar bond, a net dipole, and is a polar molecule. Which of the above statements is(are) true?
A) only statement (i) B) only statement (ii) C) both statement (i) and statement (ii) D) neither statement (i) nor statement (ii)