Q: Which equation would you use to calculate the energy change for an electron moving from $$n=3 to$$ $$n=1 in a $$hydrogen atom?

$$\Delta E = -2.18 \times 10$$^{-18}$$\ \text{J}\left(\frac{1}{n_f^2$} - \frac{1}{n_i^2$}\right)$$

Q: A photon has a wavelength of $$500\ \text{nm}. $$What is its energy? (Use $$h = 6.626 \times 10$$^{-34}$$\ \text{J}\cdot\text{s}$$, $$c = 3.00 \times 10^8$\ \text{m}/\text{s})$$

$$3.98 \times 10$$^{-19}$$\ \text{J}$$

Q: Calculate the de Broglie wavelength of a $$1.0 \times 10$$^{-27}$$\ \text{kg}$$ particle moving at $$2.0 \times 10^3$\ \text{m}/\text{s}$$. ($$h = 6.626 \times 10$$^{-34}$$\ \text{J}\cdot\text{s})$$

$$3.31 \times 10$$^{-4}$$\ \text{m}$$

Question 1

A 5.00 L container holds 2.00 g of helium gas at 25°C. What is the pressure inside the container? (Use $$R = 0.0821\ 	ext{L}\cdot	ext{atm}/	ext{mol}\cdot	ext{K})$$

Accepted Answer

$$2.41\ 	ext{atm}$$

Question 2

Which of the following statements best explains why real gases deviate from ideal behavior at high pressures?

Accepted Answer

The gas molecules experience significant intermolecular forces.

Question 3

A mixture contains 3.0 mol of nitrogen and 2.0 mol of oxygen in a 10.0 L container at 300 K. What is the partial pressure of oxygen? (Use $$R = 0.0821\ 	ext{L}\cdot	ext{atm}/	ext{mol}\cdot	ext{K})$$

Accepted Answer

$$4.92\ 	ext{atm}$$

Question 4

Which of the following is NOT an assumption of the kinetic molecular theory of gases?

Accepted Answer

Gas particles exert attractive forces on each other.

Question 5

At STP, what is the volume occupied by 2.00 mol of any ideal gas?

Accepted Answer

$$44.8\ 	ext{L}$$

Question 6

A reaction occurs in a bomb calorimeter and releases 500 J of heat. What is the change in internal energy ($$\Delta U) $$for the system?

Accepted Answer

$$\Delta U = -500\ 	ext{J}$$

Question 7

Which of the following best describes an endothermic reaction?

Accepted Answer

The system absorbs heat from the surroundings.

Question 8

A 100 g sample of water absorbs 836 J of heat. What is the temperature change? (Specific heat of water $$c = 4.18\ 	ext{J}/	ext{g}\cdot	ext{K})$$

Accepted Answer

$$2.00\ 	ext{K}$$

Question 9

Which equation would you use to calculate the energy change for an electron moving from $$n=3 to$$ $$n=1 in a $$hydrogen atom?

Accepted Answer

$$\Delta E = -2.18 	imes 10$$^{-18}$$\ 	ext{J}\left(\frac{1}{n_f^2$} - \frac{1}{n_i^2$}ight)$$

Question 10

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 11

What is the maximum number of electrons allowed in the $$d$$ subshell?

Accepted Answer

10

Question 12

Which statement about the Bohr model of the atom is correct?

Accepted Answer

It explains the quantization of energy levels in hydrogen.

Question 13

A photon has a wavelength of $$500\ 	ext{nm}. $$What is its energy? (Use $$h = 6.626 	imes 10$$^{-34}$$\ 	ext{J}\cdot	ext{s}$$, $$c = 3.00 	imes 10^8$\ 	ext{m}/	ext{s})$$

Accepted Answer

$$3.98 	imes 10$$^{-19}$$\ 	ext{J}$$

Question 14

Which region of the electromagnetic spectrum has the shortest wavelength?

Accepted Answer

Gamma rays

Question 15

According to Heisenberg’s Uncertainty Principle, which of the following is true?

Accepted Answer

The more precisely the position is known, the less precisely the momentum is known.

Question 16

Calculate the de Broglie wavelength of a $$1.0 	imes 10$$^{-27}$$\ 	ext{kg}$$ particle moving at $$2.0 	imes 10^3$\ 	ext{m}/	ext{s}$$. ($$h = 6.626 	imes 10$$^{-34}$$\ 	ext{J}\cdot	ext{s})$$

Accepted Answer

$$3.31 	imes 10$$^{-4}$$\ 	ext{m}$$

Question 17

Which of the following best describes the difference between constant pressure and constant volume calorimetry?

Accepted Answer

Constant pressure calorimetry measures $$\Delta H$$, while constant volume calorimetry measures $$\Delta U.$$

Question 18

Which quantum number specifies the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number ($$m_l)$$

Question 19

A chemical reaction produces 0.5 mol of CO$$_2$$ gas at STP. What volume of CO$$_2 is $$produced?

Accepted Answer

$$11.2\ 	ext{L}$$

CHM 1101 Exam 3 Study Guide: Gases, Thermochemistry, and Quantum-Mechanical Model of the Atom

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