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Elemental and Forces Physics Questions

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1. What is the quantum of light called?
a. the amplitude
b. the frequency
c. a photon
d. the wavelength

2. What is the oxidation number CHANGE for the iron atom in the reaction:
2 Fe2O3(s) + 3 C(s) --> 4 Fe(s) + 3 Co2(g)?

a. -6
b. -3
c. +3
d. +6

3. Of the following, which element has the highest first ionization energy?

a. aluminum
b. magnesium
c. silicon
d. sodium

4. The reaction of Cu(s) + 2 AgNO3(aq) --> Cu(NO3)2(aq) + 2 Ag(s) is best classified as a(n)

a. acid-base neutralization reaction
b. double replacement reaction
c. oxidation-reduction reaction
d. precipitation reaction

5. The average osmotic pressure of blood is about 7atm. Therefore,

a. the average blood pressure is about 7atm
b. the average pressure inside the body is about 7 atm above the external pressure.
c. a pressure of about 7atm would be required to prevent osmosis of blood is in contact with pure water across a semipermeable membrane.
d. all of the above

6. What is the smallest bond angle of SF6?

a. 60 degrees
b. 90 degrees
c. 109.5 degrees
d. 120 degrees

7. Calculate the work, w, done on the surroundings when a gas expands from 15L to 35L against a constant external pressure of 1.5atm. [1L.= 101J]

a. -5.3kJ
b. -3.0kJ
c. +3.0kJ
d. +5.3kJ

8. How many significant figures are there in the answer for the following problem?

57.5 + 0.9933 32 = ?

a. one
b. two
c. three
d. four

9. Which element has the highest first electron affinity?

a. B
b. C
c. Li
d. N

10. Which of the intermolecular forces is the most important contributor to the high surface tension shown by water?

a. dipole-dipole forces
b. dispersion forces
c. hydrogen bonding
d. ion-dipole forces

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Solution Preview

1. What is the quantum of light called?
c. a photon

2. What is the oxidation number CHANGE for the iron atom in the reaction:
2 Fe2O3(s) + 3 C(s) --> 4 Fe(s) + 3 CO2(g)?

If we look at Fe2O3, we see that the Fe is at +3. How do we know that? We know because the oxygens are in an oxide which are -2 charge each. Therefore, since there are three of them, the total charge is -6. Therefore, we must have +6 with the irons. Since there are two irons, each must be at oxidation state of +3. Next, we know that elemental iron (like all atoms in their elemental form) is at oxidation state of 0. Therefore, the change goes from +3 to 0 which is a change of -3.
b. -3

3. Of the following, which element ...

Solution Summary

10 multiple choice questions on intermolecular forces, light, etc. are answered.

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? What are the consequences for the likelihood of nuclear beta decay.

5. Two protons are separated by a distance of 10^-15m. Calculate (a) the electric force and (b) the gravitational force on one proton due to the other. Using the relative strengths of the strong, electromagnetic, weak and gravitational forces, estimate (c) the strong force and (d) the weak force between the two protons.

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