A local community needs to provide more electricity for its growing population. Currently, the community's electricity needs are met by coal-burning power plants several kilometres away. Citizens are concerned that burning more coal will produce too much air pollution.
Which of the following could be used as an alternative energy resource to help minimise air pollution in this community?
A. hydroelectric energy
B. solar energy
C. wind energy
<u>D. all of these
</u>
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Answer :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and the unpaired electrons present in the molecule.
The given molecule is, 
Beryllium has '2' valence electrons and fluorine has '7' valence electrons. Beryllium is the central atom and fluorine is the terminal atom.
Total number valence electrons in
= 2 + 2(7) = 16
According to the Lewis-dot structure, there are '4' number of bonding electrons and 12 number of non-bonding electrons (lone-pair).
The Lewis-dot structure is shown below.
Answer:
Explanation:
a. NaCl+ AgNO3-----> NaNO3+ AgCl
b. Số mol của NaCl= 0,2*0,5= 0,1 (mol)
------> Số mol của kết tủa AgCl tạo thành= 0,1 mol (dựa vào phương trình hóa học)
-----> Khối lượng của kết tủa AgCl tạo thành= 0,1*143,5=14,35(g)
c. Số mol của AgNO3= số mol của NaCl= 0,1 (mol)
------> Nồng độ mol của dd AgNO3 đã tham gia phản ứng=
=0,25(M)
The compound name of Ba3N is Barium Nitrate.
<u>Explanation</u>:
- A compound name is a combination of two or more than two elements that are bonded together giving a compound form.
- Barium Nitrate is a combination of two elements barium and nitrate which tends to bond together forming a compound.
- Barium nitrate is the inorganic compound with the chemical formula Ba(NO₃)₂. It is colorless, toxic, and water-soluble.
- It is more dangerous when it is exposed to fire, there will be an explosion irritating to eye and skin. Toxic oxides of nitrogen produced in fires.
- It has a molecular weight of 261.34 g / mol and has a molecular formula of Ba(NO₃)₂.