When ammonium nitrate (NH4NO3) dissolves in water, the solution gets cold.
NH4NO3 (s) --> NH4+ (aq) + NO3- (aq)
Which of the following is true about this system?
a. The sign on the enthalpy change is +; the sign on the entropy increases
b. The sign on the enthalpy change is -; the sign on the entropy decreases
c. The sign on the enthalpy change is +; the sign on the entropy decreases
d. The sign on the enthalpy change is -; the sign on the entropy increases
Explain your answer.
1 point
1
Question 2
2.
Look at the formation of water below. Do you think the reaction below increases in entropy or decreases in entropy from reactants to products? Explain your answer.
1 point
1
Question 3
3.
Draw a model showing what particles of solids, liquids, and gases look like. Include a key and labels if necessary.
1 point
1
Question 4
4.
What are some limitations to your model?
1 point
1
Question 5
5.
Which metal will show the greatest temperature increase if 50 J of heat is supplied to an equal mass sample of each metal? Explain your answer.
1 point
1
Question 6
6.
On a hot summer day, you go to the beach. The same sun rays are hitting the water, the sand, and the pavement of the parking lot. Which is going to be hottest and which is going to be coolest?
If the same amount of sun rays are hitting each part, why are their temperatures different?