Consider the reaction Mg2Si(s) + 4 H2O(l) → 2 Mg(OH)2(aq) + SiH4(g) Which of the reactants is in excess if we start with 50.0 g of each reactant? Show your work and explain your reasoning.

The fictional element Chaffium (symbol Ch) makes two oxyanions: ChO3¯ and ChO4¯ What would be the name of ChO4¯? Explain your reasoning. Note: The fictional element name is a Latin word that ends with -ium like many real elements. Just use the same rules as you would with a real element name.

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.

What would be the charge on an atom of nickel which only has 25 electrons? 

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

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.

For the reaction 2 CI2(g) + 4 NaOH(aq) → 3 NaCl(aq) + NaCIO2(aq) + 2H2O(I) 11.9 g CI2 is reacted with 12.0 g NaOH. Determine which is the limiting reactant. Show your work and explain your reasoning.

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.

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?