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Home  arrow Chapter 3: Stoichiometry: Calculations with Chemical Formulas and Equations  arrow Quiz 1

Quiz 1

This activity contains 12 questions.

Question 1.

Suppose you are setting up a reaction that requires an iodide salt and are planning to use sodium iodide. However, at the last minute you find that you are out of sodium iodide, so you must use potassium iodide instead. Will you need to weigh out more, less, or the same mass of potassium iodide in order to get the same number of moles of iodide ions?

End of Question 1

Question 2.
Balance the following equation and indicate whether it is a combustion, combination, or decomposition reaction:

Li + N2 arrow.gif Li3N

End of Question 2

Question 3.
Balance the following equation:

Mg3N2 + H2O arrow.gif Mg(OH)2 + NH3

End of Question 3

Question 4.
Calculate the number of molecules in a tablespoon of table sugar, C12H22O11, weighing 10.5 g.

End of Question 4

Question 5.
Calculate the number of moles of water present in a 10.0-kg sample.

End of Question 5

Question 6.
Convert the following to a balanced chemical reaction:

Gaseous hydrogen reacts with carbon monoxide to form methanol, CH3OH.

End of Question 6

Question 7.
How many F- ions are present in 2.50 mol of BaF2?

End of Question 7

Question 8.
Potassium sulfate contains 44.9 percent potassium by mass. In a 50.0-g sample of potassium sulfate, the number of moles of potassium is

End of Question 8

Question 9.
The reaction C7H8 + 3HNO3 ---> C7H5N3O6 + 3H2O can be used to make TNT. How many grams of HNO3 are required to react with 10.0 g of C7H8?

End of Question 9

Question 10.
What is the formula weight of (NH4)2SO4?

End of Question 10

Question 11.

What mass of silver chloride can be made from the reaction of 4.22 g of silver nitrate with 7.73 g of aluminum chloride? (Be sure to balance the reaction.)

AgNO3 + AlCl3 arrow.gif Al(NO3)3 + AgCl

End of Question 11

Question 12.
Write the balanced equation for the reaction that occurs when solid potassium nitrate is heated and decomposes to form solid potassium nitrite and oxygen gas.

End of Question 12

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