True/False
1. A molecule which contains polar bonds will always have dipole moment.
2. The Lewis structure of NO2 violates the octet rule.
3. In formaldehyde, CH2), both the formal charge and the oxidation number of carbon are zero.
4. When resonance occurs, the bond lengths in a molecule fluctuate rapidly.
5. As a measure of the strength of metallic onding, the boiling point of a metal is a better indicator than its melting point.
6. Electronegativites on Pauling's scale are calculated from ionization energies and electron affinities.
7. The lattice energy of large ions is greater in magnitude than that of small ions of the same charge.
8. A single covalent bond consists of a single delocalized electron pair.
9. Elements in which the outermost electron has the same principal quantum number n, show similar chemical properties.
10. Standard heats (enthalpies) of formation of compounds, delta H f, may be positive or negative.
11. In an endothermic reaction, in going from the reactants to the products at the same temperature, the value of q is negative.
12. According to the postulates of kinetic-molecular theory, the molecules of all gases at a given temperature have the same average speed.
13. For an ideal gas, a plot of PV/nRT versus P gives a straight line with a positive slope.
14. In neutralization reaction the equivalence point is the point where the indicator changes color.
15. One mole of methane (CH4) contains a total of 3 x 10^24 atoms.
16. In combustion analysis, the oxygen content of a substance is equal to the total oxygen in the CO2 and H2O collected in the absorbers.
17. When an alkali metal combines with a non-metal, a covalent bond is normally formed.
18. The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in Fahrenheit.
19. The potential energy of a car moving on a level road does not depend on its speed.
1. A molecule which contains polar bonds will always have dipole moment.
2. The Lewis structure of NO2 violates the octet rule.
3. In formaldehyde, CH2), both the formal charge and the oxidation number of carbon are zero.
4. When resonance occurs, the bond lengths in a molecule fluctuate rapidly.
5. As a measure of the strength of metallic onding, the boiling point of a metal is a better indicator than its melting point.
6. Electronegativites on Pauling's scale are calculated from ionization energies and electron affinities.
7. The lattice energy of large ions is greater in magnitude than that of small ions of the same charge.
8. A single covalent bond consists of a single delocalized electron pair.
9. Elements in which the outermost electron has the same principal quantum number n, show similar chemical properties.
10. Standard heats (enthalpies) of formation of compounds, delta H f, may be positive or negative.
11. In an endothermic reaction, in going from the reactants to the products at the same temperature, the value of q is negative.
12. According to the postulates of kinetic-molecular theory, the molecules of all gases at a given temperature have the same average speed.
13. For an ideal gas, a plot of PV/nRT versus P gives a straight line with a positive slope.
14. In neutralization reaction the equivalence point is the point where the indicator changes color.
15. One mole of methane (CH4) contains a total of 3 x 10^24 atoms.
16. In combustion analysis, the oxygen content of a substance is equal to the total oxygen in the CO2 and H2O collected in the absorbers.
17. When an alkali metal combines with a non-metal, a covalent bond is normally formed.
18. The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in Fahrenheit.
19. The potential energy of a car moving on a level road does not depend on its speed.