Chemistry Final Exam Review

What is a mole in chemistry terms?

• a mammal found in Eurasia and North America

• an SI unit for measuring the amount of a substance

• a benign tumor sometimes found on human skin appearing as a small, sometimes raised area of skin, usually with darker pigment

• a Mexican sauce made from chili peppers, other spices and chocolate

What is the molar mass of carbon?

• 6.0 g/mol

• 12..0 g/mol

• 22.4 g/mol

• 6.02 X 10^23 g/mol

What is percent composition of the element hydrogen in the compound methane, CH₄?

• 16%

• 25.1%

• 74.9%

• 100%

What are the coefficients that would correctly balance this equation?

_____Zn + _____ K₂CrO₄ ---> _____K + _______ ZnCrO₄

• 2,1,2,1

• 1,2,3,1

• 1,2,1,2

• 1,1,2,1

Which coefficients are required to correctly balance the equation,

C₂H₂ + O₂ --> CO₂ + H₂O?

• 1,2,3,2

• 2,5,4,2

• 2,4,5,2

• 2,3,5,2

What are the respective coefficients needed to balance the equation below?

____N₂ + ____H₂ ---> _____NH₃

• 1,1,1

• 1,2,3

• 1,3,2

• 3,3,2

Which of the following reactions involves two or more substances combining to form a single compound?

• single-replacement reaction

• synthesis reaction

• decomposition reaction

• combustion reaction

Which of the following reactions involves a single compound producing two or more simpler substances?

• Synthesis reaction

• Decomposition reaction

• Combustion reaction

• Double-replacement reaction

Which of the following reactions involves the ions of two compounds exchanging places to form two new compounds?

• Synthesis reaction

• Single-replacement reaction

• Double-replacement reaction

• Combustion reaction

Which of the following is a replacement reaction?

• CaCO₃ ----> CaO + CO₂

• 4Al + 3O₂ <---> 2Al₂O₃

• Mg + 2HCl <-----> H₂ + MgCl₂

• 2C₄H₁₀ + 13 O₂ <----> 8CO₂ + 10 H₂O