Gold has an atomic number of 79 and a mass number of 197. How many protons are in each atom?  [Joe7] How many neutrons are in each atom?  [Joe8] How many electrons surround the nucleus assuming that gold is neutral and has no atomic charge?  [Joe9]

Balance the following equation. If the coefficient is one, put 1 in the answer block.   [ans8] NH3   + [ans9] O2 –> [ans10] NO + [ans11] H2O

Write the name for the following compounds: FeCl3  [green1] CuCl  [green2] Au(OH)2  [green3]

Which of the following statements is true with regard to air?

A tablet of penicillin contains 250 mg of the antibacterial drug. A prescription contains 44 tablets. What is the total mass of penicillin in the prescription in grams?

Write the name for each of the following compounds: CO  [blue7] S2O3  [blue8] GeS2  [blue9]

Carbon reacts with hydrogen to form methane according to this reaction:   C   + 2H2 –> CH4 Assume that you only obtained 20 grams of methane in the above reaction (having reacted 20 grams of carbon with 20 grams of hydrogen). What is the percent yield of the reaction?

Large volumes of bottom sediments may be transported long distances by ____.

Start with this balanced equation: KMnO4 + 8HCl + 5 FeCl2 –> 5 FeCl3   + MnCl2 + 4H2O + KCl Give two ratios for the relationship between HCl and FeCl3. An example of a ratio is xHCl : yFeCl3 where x and y are numerical values.

Balance the following equation. If the coefficient is one, put 1 in the answer block.   [ans1] PCl5   + [ans2] H2O –> [ans3] H3PO4 + [ans4] HCl