Q: Which of the following best describes the relationship between wavelength ($$\lambda) $$and frequency ($$\nu) in $$the electromagnetic spectrum?

They are inversely proportional, as shown by $$c = \lambda \nu.$$

Question 1

Which of the following best describes the relationship between wavelength ($$\lambda) $$and frequency ($$
u) in $$the electromagnetic spectrum?

Accepted Answer

They are inversely proportional, as shown by $$c = \lambda 
u.$$

Question 2

A sample of gas occupies $$2.50\ \mathrm{L} at$$ $$1.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}. $$What will be its volume at $$0.500\ \mathrm{atm}$$ and $$600\ \mathrm{K}$$, assuming ideal gas behavior?

Accepted Answer

$$10.0\ \mathrm{L}$$

Question 3

Which of the following elements has the highest first ionization energy?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 4

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 5

A reaction requires $$2.00\ \mathrm{mol} of$$ $$\mathrm{H_2$} to $$react completely with $$1.00\ \mathrm{mol} of$$ $$\mathrm{O_2$} to $$form water. If $$3.00\ \mathrm{mol} of$$ $$\mathrm{H_2$}$$ and $$2.00\ \mathrm{mol} of$$ $$\mathrm{O_2$}$$ are mixed, what is the limiting reactant?

Accepted Answer

$$\mathrm{H_2$}$$

Question 6

Which of the following best explains why atomic radius decreases across a period from left to right?

Accepted Answer

The nuclear charge increases, pulling electrons closer.

Question 7

Which of the following is the correct electron configuration for a ground-state magnesium atom ($$\mathrm{Mg}$$, $$Z=12$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$

Question 8

Which of the following statements about ionic and covalent bonds is correct?

Accepted Answer

Ionic bonds involve transfer of electrons, while covalent bonds involve sharing of electrons.

Question 9

A $$5.00\ \mathrm{g}$$ sample of sodium chloride ($$\mathrm{NaCl}) is $$dissolved in water to make $$250\ \mathrm{mL} of $$solution. What is the molarity of the solution? ($$\mathrm{NaCl}$$ molar mass $$= 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 10

Which of the following best describes the VSEPR theory's prediction for the shape of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Tetrahedral

Question 11

Which of the following is a correct application of the ideal gas law $$PV = nRT$$?

Accepted Answer

Calculating the number of moles of a gas given its pressure, volume, and temperature.

Question 12

Which of the following is the best explanation for the trend in electronegativity across a period?

Accepted Answer

Electronegativity increases due to increased nuclear charge and constant shielding.

Question 13

A student is given a mixture of iron filings and sulfur powder. Which method would best separate the two substances?

Accepted Answer

Using a magnet to attract the iron filings

Question 14

Which of the following is the correct balanced equation for the combustion of propane ($$\mathrm{C_3H_8}$$)?

Accepted Answer

$$\mathrm{C_3H_8} + 5\mathrm{O_2$} \rightarrow 3\mathrm{CO_2$} + 4\mathrm{H_2O}$$

Question 15

Which of the following best describes the effect of increasing temperature on the pressure of a fixed amount of gas at constant volume?

Accepted Answer

Pressure increases because gas particles collide with the walls more frequently and with greater force.

Question 16

Which of the following is a correct statement about the photoelectric effect as explained by modern atomic theory?

Accepted Answer

Electrons are emitted from a metal surface only if the light has a frequency above a certain threshold.

Question 17

Which of the following pairs of elements would you expect to form an ionic compound?

Accepted Answer

Sodium and chlorine

Question 18

A $$10.0\ \mathrm{g}$$ sample of calcium carbonate ($$\mathrm{$$CaCO_3$$}) $$decomposes according to the equation $$\mathrm{$$CaCO_3$$} \rightarrow \mathrm{CaO} + \mathrm{CO_2$}. $$What is the theoretical yield of $$\mathrm{CO_2$} in $$grams? (Molar mass: $$\mathrm{$$CaCO_3$$} = 100.1\ \mathrm{g/mol}$$, $$\mathrm{CO_2$} = 44.0\ \mathrm{g/mol})$$

Accepted Answer

$$4.40\ \mathrm{g}$$

Question 19

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full valence shell of electrons.

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