Question 22 (Essay Worth 8 points) (05.07 HC)
In the following reaction, oxygen is the excess reactant.
SÍCIA + O2 - SiO2 + Cl2
The table shows an experimental record for the above reaction.
Experimental Record
Trial Starting Amount of SiCl4 Starting Amount of O2 Actual Yield of SiO2
1
120 g
240 g
38.2 g
N
75 g
50 g
25.2 g
a. Calculate the percentage yield for SiO2 for Trial 1. Also, determine the leftover reactant for the trial. Show your work
b. Based on the percentage yield in Trial 2, explain what ratio of reactants is more efficient for the given reaction.

Dsolubility let me know if you have any other questions for chemistry

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.

The correct answer is:   [a]:   "polar easterlies move cool air to the mid-latitudes."