What would be the charge on an atom of lead which only has 78 electrons?  [sign][magnitude]

Consider an element that has 3 naturally occurring isotopes. The isotopic masses and percent abundances are 53.9396 amu (5.845%), 55.9349 amu (91.754%), and 56.9354 amu.  What is the average atomic mass in amu of X? Show your work and give your answer to 2 decimal places.

Carl Fredricksen raised 80 sheep, then entered into a series of business transactions. He traded all the sheep for goats at an exchange rate of 5 goats for 7 sheep. Next, he exchanged all the sheep for hogs at a rate of 4 goats for 2 hogs weighing 225 lbs. each. He sold all the hogs at a market price of $60.00 per 100.0 lbs. How much money did he make from the 60 goats?  Show your work using dimensional analysis.

For the reaction CaCO3(s) + 2 HCl(aq) →  CaCl2(aq) + CO2(g) + H2O(l) If 78.1 g solid CaCO3 is mixed with 51.6 g HCl. Which one will be the limiting reactant? Show your work and explain your reasoning.

A chemist is trying to identify an unknown metal and finds that 25.0 cm³ of the substance has a mass of 224.43 g at 20°C. Which of the following metals is it? Show your work.

Cucamongine (symbol Cg) is a fictional name for one of the halogens. Note that the name ends with -ine just as the halogen names used by ordinary chemists. According to the naming rules for the oxyanions of halogens, what would be the name of CgO2¯? Explain your reasoning.

What would be the charge on an atom of gold which only has 78 electrons?  [sign][magnitude]

The names and symbols for the transition elements used in the fictional kingdom of Narnia are different from those used by the rest of the planet, except for silver, cadmium, and zinc. For the rest of the elements and chemical entities, the kingdom uses the same names and inorganic nomenclature rules as used by the rest of the world. If the name used for a transition metal is “narnium” (symbol Nr), what would be the name of NrSO4 in the kingdom of Narnia? Explain your reasoning.

During a colonoscopy, the scope is inserted in reverse order from the anus. As the doctor advances the scope, which of the following structures will be encountered immediately after the rectum?

A Jaguar traveling at 55 km/h is 25 km behind a truck traveling 50 km/h. How long will it take the Jaguar to reach the truck?