Chemistry 2nd Semester Exam Review

A catalyst is

• a solid product of a reaction

• not used up in a reaction

• one of the reactants in a single-replacement reaction

• the product of a combustion reaction

What is the mass, in grams, of 2.50 moles of carbon monoxide?

• 0.089g

• 70.03g

• 1.48g

• 50.95g

When the equation Fe + O₂ --> Fe₂O₃ is balanced, the coefficient for O₂ is:

• 1

• 2

• 3

• 4

What is the percent by mass of carbon in acetone, C₃H₆O?

• 20.7%

• 62.0%

• 1.60%

• 30.0%

Which of the following is NOT an empirical formula?

• Na₂SO₄

• C₆H₅Cl

• Sn₃(PO₄)₄

• N₂H₄

The equation H₃PO₄ + 3KOH --> K₃PO₄ + 3H₂O is an example of which type of reaction?

• decomposition

• combination

• double-replacement

• single-replacement

How many molecules are in 5.50 moles of H₂O

• 5.50 molecules

• 2.71 x 10²⁴ molecules

• 33.11n molecules

• 3.31 x 10²⁴ molecules

What is the molar mass of NaCl?

• 58.45 g/mol

• 76.00 g/mol

• 23.00 g/mol

• 35.45 g/mol

The equation 2C₃H₇OH(g)  + 9O₂(g) --> 6CO₂(g)  +  8H₂O(g) is an example of which type of reaction?

• combination

• single replacement

• combustion

• decomposition

a reaction in which an element or compound reacts with oxygen, often producing heat or light

• combination

• decomposition

• activity series of metals

• combustion     

• single replacement