Answer:
Explanation:
Sodium chloride is ionic compound. It is formed by the transfer of electron from one atom to the atom of another element.
Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.
The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are bonded together electrostatic attraction occur between anion and cations.
Sodium atom have one valance electron by losing this one valance electron sodium atom get the complete octet. Chlorine atom has seven valance electrons and needed to lose seven valance electrons or to get one electron and thus complete the octet. It is very easy for chlorine atom to get one electrons instead of losing all seven electron. Thus when it react with sodium it gain the valance electron of sodium and form ionic compound.
That's why only one atom of sodium combine with one atom chlorine.
Answer:
the answer of the questionis D Photons
Answer:
To see if the water is safe to drink.
Explanation:
It is important for local water to be tested to see how the water quality is and to check if there are any pollutants (such as fertilizers or oil). Most of the world's water is not safe to consume, it would be useful to know what your local water is like.
Answer:
2.090 g
Explanation:
The chemical formula of calcium sulfate dihydrate is CaSO₄.2H₂O.
- The mass of 1 mole of CaSO₄ is 136.14 g.
- The mass of 2 moles of H₂O is 2 × 18.02 g = 36.04 g.
- The mass of 1 mole of CaSO₄.2H₂O is 136.14 g + 36.04 g = 172.18 g.
The mass ratio of CaSO₄.2H₂O to H₂O is 172.18 g:36.04 g. The mass of water lost upon the heating of 9.983 g of CaSO₄.2H₂O is:
9.983 g CaSO₄.2H₂O × (36.04 g H₂O/172.18 g CaSO₄.2H₂O) = 2.090 g H₂O
