Question

compounds are formed by the attraction between cations and anions, 3. Dozen is to 12 as mole is to 4. One mole of chlorine gas weighs grams. 5-10 Complete the following table with the formula of the compound Cation/anion NO, N- ΝΗ, Section 2: True False (4 pts) Answer true or false. If the answer is false, correct the statement. 11. The correct name for P:O10 is phosphorus decoxide. 12 A molecule with polar bonds can never be nonpolar. The molar ratios can be found in the balanced chemical equation. Gold ion, Au has 79 electrons. www.facebo Facebook Haleigh: Yeah 12 other new m 13 Section 3: Multiple Choice (10 pts)

Need help with question 5-10.

Answer 1

1. Sr(NO3)2 - Strontiun nitrate
2.Sr3N2 - Strontium nitride ;
[since valancy of Sr is =+2 and that of N is -3
when compound formed ,it has to be satisfied.Thus while writing compound the
valancies are interchanged-Note that other compounds also
written in same way]

3.SrSe-Strontium selinide

4. NH4NO3 -Ammonium nitrate
[here valancy of NH4 is +1 and thatof NO3 is -1 ]

5. (NH4)3N - Ammonium nitride

6. (NH4)2Se-Ammonium selinide
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11. False
Phosphorus decoxide has formula P4H10

12. False
Polarity of a molecule depends on geometry of molecule also.Compounds like
CO2 has a linear structure O=C=O : the net dipole will be zero due to equal
polarity of two C-O bonds which act in opposite direction .Thus CO2 is non
polar even though there is two polar bonds present

13.True
We write molar ratios using stoichiometric coefficients from balanced chemical
reaction
for eg: 2H2 +O2 ---> 2H2O
mole ratio of H2:O2 = 2:1

14. False
Gold atomic number Z= 79 That means number of electrons= 79
Gold ion forms when Gold looses one of its electron
Thus Au+ will have 78 electrons only
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Thank you