General Chemistry Answers

Q9: Calculate the standard free energy change for the combustion of methane at 250^oC. Again, assume that all reactants and products are gases. 3 SIG FIGURES.

Q10 PART A: Calculate the free energy change for the combustion of methane at 250^oC. Assume that all reactants and products are gases and that the partial pressures of the various gases of interest are: methane = 0.56 atm, oxygen = 0.45 atm, carbon dioxide = 2.10 atm, water = 3.40 atm.

PART B: What is the value of the equilibrium constant for the reaction described in Question 10? Provide an answer correct to 2 significant figures.

PART C: Based on your calculations in previous problems, at what temperature will the combustion of methane be at equilibrium? Provide an answer correct to 2 significant figures

Q8.

Calculate the standard free energy change for the combustion of methane at 25^oC. Assume that all reactants and products are gases. Provide an answer correct to 3 significant figures. Do not use scientific notation or include units to report your answer.

Q.6

Liquid bromine (Br₂) boils at 58.8^oC and has a standard enthalpy of vaporization equal to 29.6 kJ/mol. Calculate the entropy change when 159.8 g of bromine vaporizes. Provide an answer correct to 3 significant figures.

What is the change in the internal energy of a system in which 66.1 kJ of heat is transferred to the surroundings while the surroundings do 44.0 kJ of work on the system? Provide an answer that is correct to 3 significant figures. 

Two small conducting and identical spheres A and B have charges -25 nC and +15 nC, respectively. They are separated by a distance of 0.02 m. (a) What is the magnitude of the electric force between the two spheres? Is this force attractive or repulsive? (b) The spheres are then allowed to touch each other and then separated. What is the magnitude of the force between the two spheres? Is this a repulsive force or an attractive force?

Two small conducting and identical spheres A and B have charges -25 nC and +15 nC, respectively. They are separated by a distance of 0.02 m.

1.It is a measure of how equally the electrons in a bond are distributed between the two atoms involved in a covalent bond.

A. polarity   C. ionization energy

B. octet rule    D. electron affinity 

2.The reaction of water with alkene to produce an alcohol is a/an ______ reaction. 

A. Addition    C. Combustion

B. Condensation    D. Saponification 

3. The organic starting materials for the preparation of an ester could be_________

A. an acid and alcohol   C. a ketone and alcohol

B. water and oxygen     D. alkane and aldehyde

4. Ammonia (NH₃), can be considered a Lewis base because it can donate what?

A. electrons   C. protons

B. hydronium ions   D. hydroxide ions 

5. In the ground state of a cobalt atom there are _____ unpaired electrons and the atom is _____.

A. 3, paramagnetic

C. 2, diamagnetic

B. B. 5, paramagnetic

D. 0, diamagnetic

6.Which of the following bond is the strongest?

A. carbon – hydrogen bond C. carbon – carbon triple bond

B. carbon – nitrogen bond  D. carbon – carbon single bond 

a. Get your 1 ruler-sized strip of paper, put glue on the entire strip on one face then fold the paper. Let the paper stick to make it half in size. This is your set-up 3.

b. Get another 1 ruler-sized strip of paper, do the same procedure in letter but on this one use a baby powder after putting glue and observe if they will stick together. This is your set-up 4.

a. How will you describe the forces of attraction between solid solute and liquid solvent?

b. How will you differentiate the results of set-up 3 and set-up 4?

The superficial mass velocity is found to be 200 lb/hr.ft2. Find its

equivalent in kg/s.m2

Balance the following equation, then determine how many moles of AlCl3 would be made from 2 moles of HCl?