The largest number of both legal and undocumented immigrants to the United States come from what country?
A) Cuba
B) Mexico
C) the Philippines
D) South Korea
E) Dominican Republic
Answer: B
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The phosphoric acid salt of caffeine has the structure
This molecule behaves as an acid in that it can donate a hydrogen ion, created from the hydrogen atom bonded to the positively charged nitrogen atom. What salt is formed when 1 mole of this salt reacts with 1 mole of sodium hydroxide, NaOH, a strong base?
A. Na+H2PO4- B. Na2+HPO42- C. Salts can't react to form salts, rather they only arise from the reaction of an acid and a base. D. H3O+H2PO4-
How distinct were Mesozoic mammals from their reptile neighbors?
When the sample chamber of a polarimeter is empty which of the following statements is true?
A) The maximum transmission of light occurs when the polarizer and analyzer are parallel to each other. B) The maximum transmission of light occurs when the polarizer and analyzer are perpendicular to each other. C) The maximum transmission of light occurs when the polarizer and analyzer are at an angle of 120° to each other. D) Since the instrument is empty the positions of the polarizer and analyzer have no effect on the amount of transmission.
There were only four glacial ice advances during the Pleistocene
a. True b. False Indicate whether the statement is true or false