First person to get mulitple scince question right will get 10 points?

Question

1. How much energy is needed to melt 3 kg of aluminum at its melting point?
a. 133000 J
b. 1197000 J
c. 262941000 J
d. 399000 J
Questions 2-4
At a steel mill a 50 kg chunk of iron at 22°C is heated to its melting point, completely melted, and then heated more to a final temperature of 1800°C.
2. How much energy is required to heat the iron to its melting point?
a. 35.3 MJ
b. 21.9 GJ
c. 34.8 MJ
d. 40.9 MJ
3. How much energy is required to melt the iron once it reaches its melting point?
a. 14.5 MJ
b. 316 MJ
c. 17.3 GJ
d. 5.78 kJ
4. How much energy is needed to heat the iron the rest of the way to 1800°C after it melts? Assume the same specific heat.
a. 40.9 MJ
b. 34.8 MJ
c. 3.83 GJ
d. 6.1 MJ
5. Why will the sauce of a pizza burn your mouth long after the crust is safe to touch?
a. The sauce has a lower specific heat than the crust.
b. The sauce has a greater specific heat than the crust.
c. The crust does not transfer its heat to you as easily as the sauce does.
d. The sauce is buried too far under other things to get rid of its heat.
6. When water freezes, what happens to the temperature of the surrounding air?
a. The air gets colder because of its proximity to the ice.
b. The air gets warmer because the forming ice gives heat up.
c. The air gets colder because it gives some of its heat to help the water freeze.
d. There is no effect on the temperature of the air.
7. When water vapor (steam) condenses what happens to the temperature of the surrounding air?
a. The air gets warmer because of its proximity to the condensing steam.
b. The air gets warmer because the condensing water gives heat up.
c. The air gets colder because it gives some of its heat to help the water condense.
d. There is no effect on the temperature of the air.
8. Why does warm air rise?
a. It is natural for warm air to rise; this helps keep a steady supply of cooler air near the Earth.
b .Warmer air is less dense than colder air and naturally floats to the top.
c. Warm air is generated by combustion, which uses oxygen. The deficiency of oxygen makes the warm air lighter, so it rises.
d. Warm air radiates its heat away; since heat rises, the air travels with it.
9. What is the amount of energy released by 15 g of tin as it freezes (solidifies) at 232°C?
a. 209 MJ
b. 209 kJ
c. 900 kJ
d. 900 J
10. How much energy is required to melt 85 kg of solid mercury at -39°C?
a. 935 kJ
b.-36.5 MJ
c. 25.1 MJ
d. -464 kJ
11. Sound is transmitted through solids, liquids and gases as the vibration is passed from a molecule to its neighbors. Which of the heat transfer methods is this most similar to?
a. radiation
b. conduction
c. convection
12. Many cooking pots have hard plastic or wooden handles. What is the reason for this?
a. The handles are made from a good conductor of heat so that the heat is drawn away from the pan to protect your hands.
b. The handles are made from a poor conductor of heat so that the heat cannot be drawn into your hands as easily.
c. The handles are made from different materials to make use of the differing chemical properties to block the transfer of heat.
d. When the handles heat up, they expand more than the pot thus allowing the handles to radiate heat away more effectively.
13. What does it mean to say that a material has a high specific heat?
a. It means the material is a poor conductor of heat.
b. It means the material is a good conductor of electricity.
c. It means the material can get very hot compared to other materials.
d. It means the material readily absorbs and releases energy.
14. How can the specific heat be characterized for a material that heats up quickly?
a. It has a low specific heat.
b. It has a high specific heat.
c. It is impossible to make this judgment.
15. What mass of ethyl alcohol will give up 33,000 J of energy as it cools from 27°C to -3°C?
a. 2.41x109kg
b. 0.566kg
c. 1.92×109kg
d. 0.453kg
Questions 16-19
A 75 g chunk of metal is heated to 100°C and then dropped into 0.5 kg of water initially at 22°C. After a short time, the water reaches a final temperature of 23.1°C.
16. How much heat energy does the metal transfer to the water?
a. 345 kJ
b. 345 J
c. 2302 J
d. 24.5 kJ
17. What is the final temperature of the chunk of metal?
a. 23.1°C
b. 22°C
c. 92.7°C
d. 54.9°C
18. What is the specific heat of the metal?
a. 399
b. 27,900
c. 130
d. 377
19. The chunk is most likely made of which type of metal?
a. brass
b. lead
c. tin
d. copper
20. In the old days, it was common to bring a hot object into bed with you on a cold winter night. Which would be better: a 10 kg hot water bottle or a 10 kg iron block, both at the same temperature?
a. The water bottle because water has a higher specific heat.
b. The water bottle because iron has a higher specific heat.
c. The iron block because water has a higher specific heat.
d. The iron block because iron has a higher specific heat.

Answer 1

a,c,b,b,a,d,c,a,a,a,d,c,c,c,b,b,a,b,a,c

although im not sure about question 9

Answer 2

This is a valiant effort, as I have seen this question posted at least 3 times. However, I truly don't believe that anyone is stupid enough to do your homework. My guess is that you could have had at least half of these questions answered if you had just looked up the answers instead of wasting your time trying to con people into doing your homework because you are too retarded to open the book and read the index to find the answers. I hope you don't think people will do your work for you in the real world.

Answer 3

2 points

Answer 4

As a college professor, without the 6 gin martinis I just consumed, I could probably figure these out. Some other night.

Answer 5

Are these 10 points in addition to the "best answer" 10 points given to all best answers on this site?

You're asking for a lot, are you going to make it worth our time and effort?

Answer 6

first person times 10=10.
Yep, I come from the old school and this is what I learned. I get ten points. Keep the points, I just wanted you to know how intelligent I cannot be.
Keep smiling
grannywinkie

Answer 7

these answers are worth way more than 10 points send me $100 and we'll start there

Answer 8

You spell Scince >>>>Science

Answer 9

Do your own dam homework

Answer 10

none of the above

Answer 11

Do your own homework.