Chemistry IB Topic 9

A balanced chemical equation allows one to determine the

• mole ratio of any two substances in the reaction.

• energy released in the reaction.

• electron configuration of all elements in the reaction.

• mechanism involved in the reaction.

The coefficients in a chemical equation represent the

• masses, in grams, of all reactants and products.

• relative numbers of moles of reactants and products.

• number of atoms in each compound in a reaction.

• number of valence electrons involved in the reaction.

Tags

NGSS.HS-PS1-7

Actual yield must be determined by

• experiments

• calculations

• theoretical yield

• estimation

Tags

NGSS.HS-PS1-7

The actual yield of a chemical reaction is generally

• less than the theoretical yield.

• greater than the theoretical yield.

• equal to the percentage yield.

• greater than the percentage yield.

Tags

NGSS.HS-PS1-7

To determine the limiting reactant in a chemical reaction involving known masses of the two reactants, which of the following would be most useful?

• determining the masses of 100 mol of each reactant

• determining the molar masses of the products

• calculating bond energies

• calculating the mass of a single product formed from each reactant

Tags

NGSS.HS-PS1-7

• 3

• 4

• 6

• 8

Tags

NGSS.HS-PS1-7

• 
• 
• 
• 

Tags

NGSS.HS-PS1-7

• 10:6

• 3:4

• 2:3

• 4:3

Tags

NGSS.HS-PS1-7

Fewer steps are required to solve stoichiometry problems when

• the reactant is given in grams and the product is sought in grams.

• the reactant is given in moles and the product is sought in moles.

• the reactant is given in grams and the product is sought in liters.

• the reactant is given in liters and the product is sought in number of the atoms.

Which of the following mathematical expressions correctly states the solution for the percentage yield using actual yield and theoretical yield?

• 
• 
• 
• none of these are correct