Semester 2 Final Day 2

Which of the following is not true about one mole?

• one mole contains 6.02 x 10²³ particles

• 12 g of carbon equals one mole of carbon atoms

• the mass of 1 mole of carbon atoms = the mass of 1 mole of boron atoms

• the number of atoms in 1 mole of carbon = the number of atoms in 1 mole of boron

The number oxygen atoms represented by the formula Pb(C₂O₄)₂  is

• 2

• 3

• 6

• 8

After completing an experiment, all chemical waste should be

• left at your lab station for the next class

• disposed of according to the instructor's directions

• dumped into the sink

• taken home

Approved eye protection devices (such as goggles) are worn in the laboratory

• to prevent eye strain

• to improve your vision

• only if you don't have glasses

• any time heat, glass, or chemicals are used

What does 6.02 x 10²³ represent?

• The number of moles in the molar mass of any substance

• The number of particles in 12 grams of any substance

• The number of particles in 1 mole of any substance

• The number of grams in the molar mass of any substance

What is the actual yield?

• The amount of error seen in the amount of product produced.

• The calculated amount of product that should ideally be produced.

• The difference between the calculated amount of product and actual amount.

• The amount of product produced in an experimental reaction.

Why does heating a reaction increase the reaction rate?

• It increases the number of particles

• It increases the number of collisions

• It increases the concentration of the particles

• It increases the activation energy

How many carbon atoms are present in the molecule C₂H₆?

• 1

• 2

• 6

• 8

What information can we get from looking at the percent yield?

• How much product should have been produced during the reaction.

• How much reactant is needed to run a chemical reaction.

• How accurate the results of the chemical reaction are

• What equipment you will need to run a chemical reaction.

Which of the following is always equal on each side of the arrow in balanced chemical reaction?

• Sum of the coefficients

• Sum of the subscripts

• Total number of molecules

• Total number of atoms