Question

Which best explains why a wood-burning fireplace does not represent a closed system?

A. because a fire requires oxygen from the atmosphere to burn
B. because they are not all made of brick
C. because they can be used for cooking
D. because the ashes have to be swept away

@Imtiaz7

Answer 1

My answer is A.

Answer 2

@BlossomCake can you explain the question actually my language is weak

Answer 3

Of course! Just give me a minute to rephrase it.

Answer 4

ok

Answer 5

The question is asking why a fireplace that has burning wood does not represent a closed system.

Answer 6

A closed system is a physical system which does not allow certain types of transfers (such as transfer of mass) in or out of the system.

Answer 7

And you know what a fireplace is, right?

Answer 8

fireplace the place where fire is burning?

Answer 9

Yep. :)

Answer 10

Do you understand the question, because if not I can try to explain more thoroughly....

Answer 11

yes please

Answer 12

Okay. The question deals with closed systems. Do you know what a closed system is?

Answer 13

closed system means the transfer of energy, but not of mass, in a system

Answer 14

Okay, good. So, the question is asking us, how does a fireplace not represent a closed system.

In other words, we are being asked to state why a fireplace is an open system.

Do you know what an open system is?

Answer 15

in open system both transferred energy as well as mass

Answer 16

Yep. Do you understand the question now, or not yet?

Answer 17

it means the fireplace transmits mass?

Answer 18

Uh... Not exactly... I think the answer to the overall question is A.

So, I am going to go with A. and post the next question. :) @Imtiaz7

Answer 19

but tell me how A

Answer 20

Well, because I know it's not B. or C. and D. doesn't seem right either....

Answer 21

lol then ok but this is not a techanical answer lol :)

Answer 22

I know, but... I don't know how else to answer >.<