Q: A 250 g sample of iron ($$Fe) is $$heated from $$37\ ^\circ C to$$ $$75\ ^\circ C. If $$the specific heat capacity of iron is $$0.45\ \mathrm{J/g\ ^\circ C}$$, how much heat ($$q) is $$absorbed by the iron?

$$q = 250 \times 0.45 \times (75 - 37) = 4,275\ \mathrm{J}$$

Question 1

Which of the following statements best describes an endothermic reaction?

Accepted Answer

It absorbs heat from the surroundings, resulting in a temperature decrease.

Question 2

A 250 g sample of iron ($$Fe) is $$heated from $$37\ ^\circ C to$$ $$75\ ^\circ C. If $$the specific heat capacity of iron is $$0.45\ \mathrm{J/g\ ^\circ C}$$, how much heat ($$q) is $$absorbed by the iron?

Accepted Answer

$$q = 250 	imes 0.45 	imes (75 - 37) = 4,275\ \mathrm{J}$$

Question 3

Which of the following is the correct formula for the energy of electromagnetic radiation?

Accepted Answer

$$E = h 
u$$

Question 4

Which of the following sets contains elements that would be expected to have very similar chemical properties?

Accepted Answer

Li, Na, K

Question 5

Which of the following is a correct statement of Hess's Law?

Accepted Answer

If a reaction is carried out in a series of steps, the $$\Delta H$$ for the reaction will equal the sum of the enthalpy changes for the individual steps.

Question 6

Which of the following electron configurations is correct for Gallium ($$Ga$$, atomic number 31)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^{10}$$\ $$4p^1$$

Question 7

Which of the following transitions corresponds to the absorption of the greatest amount of energy by an electron in a hydrogen atom?

Accepted Answer

From $$n=1 to$$ $$n=2$$

Question 8

Which of the following best explains why atomic radius increases as you move down a group in the periodic table?

Accepted Answer

Additional electron shells are added, increasing the size of the atom.

Question 9

Which of the following elements has the most negative electron affinity?

Accepted Answer

Cl

Question 10

When sodium metal reacts with water, which of the following products is formed?

Accepted Answer

$$NaOH ($$aqueous) and $$H_2 ($$gas)

Question 11

Which of the following is the most reactive in water?

Accepted Answer

K

Question 12

Which of the following is the correct relationship between wavelength ($$\lambda$$), frequency ($$
u$$), and the speed of light ($$c$$)?

Accepted Answer

$$c = \lambda 
u$$

Question 13

Which of the following statements about metallic and non-metallic oxides is correct?

Accepted Answer

Metallic oxides are basic and form alkaline solutions when they react with water.

Question 14

Which of the following is the correct formula for calculating the amount of heat ($$q) $$absorbed or released by a substance?

Accepted Answer

$$q = m \cdot c \cdot \Delta T$$

Question 15

Which of the following is the most acidic oxide?

Accepted Answer

$$SO_3$$

Question 16

Which of the following is a correct statement about the first law of thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Question 17

Which of the following is the correct ground-state electron configuration for a neutral sulfur atom ($$S$$, atomic number 16)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^4$$

Question 18

Which of the following best describes the trend in ionization energy across a period from left to right?

Accepted Answer

Ionization energy increases due to increasing nuclear charge.

Question 19

Which of the following is the correct value for the wavelength of light that has a frequency of $$1.66 	imes 10$$^{15}$$\ \mathrm{s}^{-1}$$? (Speed of light $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$1.81 	imes 10$$^{-7}$$\ \mathrm{m}$$

General Chemistry Final Exam Review: Thermochemistry, Atomic Structure, and Periodic Properties

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