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.
Lead: Pb, oxygen: O, and silver: Ag
Answer:
See explanation.
Explanation:
1. There are 8 electrons. Elements that end with 2p orbitals are in the 2nd period (aka row) of the periodic table. Elements that have 4 electrons in 2p are in the 16th group (aka column) (column 16 may also be referred to as 6A) of the periodic table. So looking at row 2, column 16, we can see that the first diagram is of O, Oxygen.
2. 8 electrons. This is the same diagram as the one above.
3. 13 electrons. Elements ending with 3p are in period 3. Elements with 1 valence electron in a p orbital are in group 13 (aka group 3A).
4. 7 electrons. We already know 2p is period 2. 3 valence electrons in a p orbital means that it is in group 15/group 5A.
I did not write the answers for #3 and 4 but they can be easily found on a periodic table with the info I gave.
thunderstorms and heavy rain
Explanation:
The weather in a region with an incoming air mass made up of moist air is predominantly that of thunderstorms and heavy rain.
Moist air brings in rainfall and thunderstorms. They are peculiar and predominant in tropical regions of the world .
- A moist air is an air mass that is moisture laden or full of water vapor.
- They are usually formed where evaporation of water vapor from sea water is very high.
- The evaporated water is warmer and lighter than the surrounding air.
- By virtue of this, it moves inland and condenses to form massive rainfall accompanied by thunderstorm.
learn more:
Climate brainly.com/question/10856870
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