In the following reaction, oxygen is the excess reactant. SiCl4 + 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
32.96 g
100 g
100 g
2
75 g
50 g
25.2g
a. Calculate the percentage yield for SiO2 for Trial 1. Also, determine the leftover reactant for
b. Based on the percentage yield in Trial 2, explain what ratio of reactants is more efficient for

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

the correct answer is:

a. formation of precipitation

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.