Science Quiz1. Which of the following is the correct electron-dot formula for water?

2. Which of the following is the correct electron-dot formula for carbon dioxide?

3. Which of the following represents the correct formula for aluminum oxide?(a) AlO(b) Al2O3

(c) AlO2

(d) Al2O4. Which of the bonds, shown by the dash, has the greatest polarity?

(a) H-Cl(b) H-NH2

(c) H-OH(d) H-SH

5. What is the major attraction between water molecules in the solid physical state?(a) dipole-dipole interactions(b) electrostatic interactions between charged atoms(c) hydrogen-bonds(d) physical entanglement of the molecules

6. Which of the following is the correct name for NaHCO3?(a) sodium hydrogen carbonate(b) sodium acetate(c) nitrogen hydrogen carbonate(d) sodium hydrogen carbon trioxide

7. What is the formal charge of the oxygen atom of the following compound?

(a) +3(b) +1(c) -2(d) -3

8. The molecule N2 is isoelectronic with...(a) O2

(b) F2

(c) NO(d) CN-

9. In which of the following compounds does ionic bonding predominate?(a) NH4Cl(b) CO2

(c) CH4

(d) LiBr10. Which of the following molecules contains only one non-bonding pair of valence electrons?

(a) NH4+

(b) HCN(c) C2H4

(d) N2

ANSWERS

1.d

2.c

3.b

4.b

5.c

6.a

7.c

8.d

9.a

10.b