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The questions and answers for the first test of the chem 1110 course during the fall 2008 semester. The test covers various topics in chemistry, including calculations of densities, moles, molecules, and mass production in chemical reactions.
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CHEM 1110 test 1 – Fall 2008 copy 975 page 1
Answer the following questions on the answer sheet.
N A (^) = 6.022 × 10 mol TK = t E (^) C+ 273. 23 –
Calculate the density of a piece of metal that has a mass of 264 g and a volume of 29.7 mL.
Calculate the number of moles there are in 17.2 g of CH? 4
How many molecules are there in 26.5 moles of CH? 4
How many grams of Na PO are produced by reacting 3.63 g of NaOH with an excess of H PO? 2 4 3 4 The reaction is: H PO 3 4 + 3NaOH! Na PO + 3H O 3 4 2
What is the percent Fe, P and O in the compound: FePO. 4
How many grams of Na PO are produced by reacting 2.29 g of NaOH with 2.06 g of H PO? 3 4 3 4 The reaction is: H PO 3 4 + 3NaOH! Na PO 3 4 + 3H O 2
Which of the following is a characteristic of a scientific theory? A) A theory is always tentative. B) A theory is never really useful for practical applications C) Beyond the original proof, theories cannot be proven. D) Beyond the original proof, theories cannot be proven. E) A theory must eventually be proven to be valid.
Convert 10.5 mg to grams.
Give the answer to the following operation to the correct number of significant figures. 4.12 + 9.