Question

A piece of copper at 10 °C is dropped into a glass of water at 35 °C. Which statement is correct?

Heat will flow from the copper to the water in the glass until both reach the same temperature.
Heat will flow from the water in the glass to the copper until both reach the same temperature.
The final temperature of the water in the glass and the copper will be 10 °C.
The final temperature of the water in the glass and the copper will be 35 °C.

Answer 1

Am I right with B?

Answer 2

Hmm... do you know the rules of osmosis and diffusion?
Yes, you're correct.

Answer 3

Kind of

Answer 4

Reasons why the others are incorrect:
A is wrong because the water is hotter. Heat will express itself outwards towards cooler objects, so the copper will become warmer while the water becomes cooler.
C & D - wrong because those are initial temperatures. C is wrong because there is no way things will stay that cool and D is wrong because there is no way things will be that warm - this isn't happening in a vacuum, so heat will also escape from the top of the glass.

Answer 5

Okay, thank you so much for the explanation

Answer 6

tl;dr : C is incorrect because the copper at 10 degrees is taking in heat from the water. So unless the heat suddenly all escaped out the water (physically impossible by the laws of nature) the copper's temperature has to increase.

And as I said, the heat energy has to balance out between a warm and cool object, so D is wrong because heat is also escaping OUT the water while also going INTO the copper.

Answer 7

No problem!
Cheers,
- Kitt