Answer:
it natural gas or fossil fuels
The internal energy has the symbol U. Q is positive if heat is added to the system, and negative if heat is removed;
....."W is positive if work is done by the system"........
and negative if work is done on the system.
So, work done by a system is positive.
I wanna say false, but I’m sorry if I’m wrong :(
Answer:
True
Explanation:
coz it is when one or more substances are mixed to produce one substance
Calcium has only two valence electrons in its shell. In order to agree with the octet rule it bonds with oxygen which has 6 valence electrons and with hydrogen which has 1 valence electron. Hope this answers the question. Have a nice day.