Chemistry Ch. 9: Stoichiometry

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.

Tags

NGSS.HS-PS1-7

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

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

How many mole ratios can be correctly obtained from the chemical equation?
 $2Al_2O_3(l)\rightarrow4Al(s)+3O_2(g)$  

• 3

• 4

• 6

• 8

Tags

NGSS.HS-PS1-7

Which expression can be used to solve a mass (HCl)-to-mole (Cl2) conversion for the equation?

 $2HCl\rightarrow H_2+Cl_2$  

• 
• 
• 
• 

Tags

NGSS.HS-PS1-7

In the following equation what is the mole ratio of aluminum to oxygen?
 $2Al_2O_3\rightarrow4Al+3O_2$  

• 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.

Tags

NGSS.HS-PS1-7

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

Tags

NGSS.HS-PS1-7