Exploring Moles and Balancing Chemical Equations

What is the numerical value of a mole?

• 6.22 x 10^23

• 1.00 x 10^24

• 12

• 6.02 x 10^23

How many molecules of ammonia are produced from 6.02 x 10^23 molecules of N2?

• 1.20 x 10^24

• 12.04 x 10^23

• 3.01 x 10^23

• 6.02 x 10^23

What is conserved in an exothermic reaction?

• Mass, charge, and energy

• Mass only

• Energy only

• Charge only

What is necessary for writing a balanced chemical equation?

• Chemical formulas and mass numbers

• Chemical formulas and coefficients

• First ionization energies and mass numbers

• First ionization energies and coefficients

What does a coefficient in a chemical equation represent?

• The mass number of the element

• The charge of the ion

• The quantity of molecules or atoms

• The first ionization energy

What is the correct coefficient for HCl in the balanced equation of zinc reacting with hydrochloric acid?

• 1

• 4

• 2

• 3

How many moles of oxygen are there in the product side of the reaction involving zinc and hydrochloric acid?

• 1

• 2

• 3

• 4

Which equation demonstrates conservation of mass and charge?

• Equation B

• Equation A

• Equation D

• Equation C

What compound is represented by X in the balanced equation?

• C2H4O

• C3H8O

• C2H5OH

• C2H6O

What is the coefficient assigned to carbon monoxide when balancing Fe2O3 with CO?

• 2

• 3

• 4

• 5