Answer:- B- 
Explanations:- Sharing of electrons takes place between non metals and the bond formed by the sharing of electrons is known as covalent bond. In first choice we only have a zinc metal and so no sharing of electrons would be possible here.
In third choice we have NaCl. Na is a metal and Cl is a non metal. The property of metals is to transfer its valence electrons to the non metal and the bond formed is known as ionic bond. So, third choice is also not correct.
In choice B we have sulfate ion that has sulfur and oxygen atoms and both of these are non metals. So, sharing of electrons is present here between the S and O atoms and covalent bonds are formed.
So, choice B- is the right answer.
Answer:
The greenhouse affect is what traps the Sun’s heat or rays/ temperature in our atmosphere which causes our global warming
Explanation:
Answer:Group 1 elements have 1 valence electron, meaning they have 1 extra electron that can easily be donated to an atom in search of 1 more electron. When they give away that extra electron to form an ionic compound, they become more stable.
For example, Group 7A (Group 17) elements have 7 valence electrons, meaning they need 1 extra electron to be stable. Group 1 and 7A elements make splendid ionic compounds.
Explanation:
The speed of sound at 20 oC in air is 343 m/s.
The speed of sound in helium at 20 oC is 927 m/s.
The speed of sound in natural gas (methane) at 20 oC is 446 m/s.
Explanation:
- The speed of sound depends upon the density and elasticity of gas.
- The speed of sound is the distance which is traveled per unit time by a sound wave as it goes through an elastic medium.
- The speed of sound in gas depends only on its temperature and composition.
- Also the speed of sound refers to the speed of sound waves in air.
- Air IS 343 m/s
- Helium is 927 m/s.
- Natural gas (methane) is 446 m/s.
Answer:
mole
Explanation:
It is the unit of chemistry. It is called Avogadros numver
