Q: Given the enthalpy changes: $$\text{Ca}(s) + \frac{1}{2} \text{O}_2(g) \rightarrow \text{CaO}(s), \Delta H = -635.1\ \text{kJ}$$ and $$\text{CaCO}_3(s) \rightarrow \text{CaO}(s) + \text{CO}_2(g), \Delta H = 178.3\ \text{kJ}$$, calculate $$\Delta H$$ for $$\text{CaCO}_3(s) \rightarrow \text{Ca}(s) + \frac{1}{2} \text{O}_2(g) + \text{CO}_2(g).$$

$$\Delta H = 813.4\ \text{kJ}$$

Q: For a photon energy of $$7.0 \times 10$$^{-20}$$\ \text{J}$$, what is the corresponding wavelength in nanometers? (Use $$E = \frac{hc}{\lambda})$$

$$2.8 \times 10^3$\ \text{nm}$$

Question 1

A sample of gas is compressed from 2.0 L to 1.0 L at constant temperature. According to Boyle's Law, what happens to the pressure of the gas?

Accepted Answer

The pressure doubles.

Question 2

A 75.0 mL sample of 0.250 M NaCl is diluted to a total volume of 150.0 mL. What is the final molarity of the solution?

Accepted Answer

$$0.125\ 	ext{M}$$

Question 3

Which statement best describes the relationship between the volume and pressure of a gas, as shown in the graph provided (first image)?

Accepted Answer

Volume is inversely proportional to pressure.

Question 4

A blimp is filled with 2400 kg of helium at 730 torr and 20.0°C. What equation would you use to calculate its volume?

Accepted Answer

$$V = \frac{nRT}{P}$$

Question 5

Three 1.0 L samples of N$$_2$$, C$$_3H$_8$$, and SF$$_6$$ are all at 0°C and 1 atm. Which property is the same for each sample?

Accepted Answer

Average kinetic energy

Question 6

Refer to the second image (Maxwell-Boltzmann distribution). Which curve corresponds to the highest temperature?

Accepted Answer

Curve A

Question 7

If 0.00150 moles of CO$$_2$$ effuse in 1 hour, how many moles of N$$_2$$ would effuse in the same time under identical conditions? (Use Graham's Law: $$	ext{Rate}_1/	ext{Rate}_2 = \sqrt{M_2$/M_1$})$$

Accepted Answer

$$0.00188\ 	ext{mol}$$

Question 8

Which statement is true regarding deviations from the ideal gas law?

Accepted Answer

Deviations become more pronounced at higher pressures and lower temperatures.

Question 9

For the evaporation process $$A(\ell) \rightarrow A(g) at $$constant temperature and pressure, what are the signs of $$q$$ and $$w$$?

Accepted Answer

$$q is $$positive, $$w is $$negative

Question 10

Which of the following processes is endothermic?

Accepted Answer

As a reaction in a beaker proceeds, the beaker gets colder.

Question 11

Given the enthalpy changes: $$	ext{Ca}(s) + \frac{1}{2} 	ext{O}_2(g) ightarrow 	ext{CaO}(s), \Delta H = -635.1\ 	ext{kJ}$$ and $$	ext{CaCO}_3(s) ightarrow 	ext{CaO}(s) + 	ext{CO}_2(g), \Delta H = 178.3\ 	ext{kJ}$$, calculate $$\Delta H$$ for $$	ext{CaCO}_3(s) ightarrow 	ext{Ca}(s) + \frac{1}{2} 	ext{O}_2(g) + 	ext{CO}_2(g).$$

Accepted Answer

$$\Delta H = 813.4\ 	ext{kJ}$$

Question 12

For a photon energy of $$7.0 	imes 10$$^{-20}$$\ 	ext{J}$$, what is the corresponding wavelength in nanometers? (Use $$E = \frac{hc}{\lambda})$$

Accepted Answer

$$2.8 	imes 10^3$\ 	ext{nm}$$

Question 13

When light from a laser pointer passes through two adjacent slits, which statement is true about the observed interference pattern?

Accepted Answer

It illustrates that light has wave-like properties and displays alternating regions of light and dark.

Question 14

According to the Bohr frequency condition, for light to be emitted by a hydrogen atom, what must be true?

Accepted Answer

The photon energy must equal the energy difference between two states of the atom.

Question 15

Refer to the third and fourth images (probability density plots for hydrogen atomic orbitals). What are the values of $$\ell$$ for each orbital?

Accepted Answer

First: $$\ell = 0$$, Second: $$\ell = 2$$

Question 16

Which of the following is a possible set of quantum numbers for an electron in an atom?

Accepted Answer

$$n = 4, \ell = 3, m_\ell = -2, m_s = -1/2$$

Question 17

For quantum number $$n = 4$$, what is the total number of orbitals and the maximum number of electrons that can occupy those orbitals?

Accepted Answer

16 orbitals, 32 electrons

Question 18

Which Lewis structure (fifth image) represents CH$$_2O$$?

Accepted Answer

First structure (top)

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