Q: Convert $$1 \ \mu\mathrm{m} to $$meters.

$$1 \times 10$$^{-6}$$ \ \mathrm{m}$$

Q: How many atoms of copper are in a penny made of pure copper (atomic number $$29) $$and weighing $$2.15 \ \mathrm{g}$$? ($$N_A = 6.022 \times 10$$^{23}$$ \ \mathrm{atoms/mol}$$, molar mass of Cu $$= 63.55 \ \mathrm{g/mol})$$

$$2.04 \times 10$$^{22}$$ atoms

Q: A dipole moment ($$\mu) is $$calculated as the product of charge ($$Q) $$and distance. If a molecule has a charge separation of $$1.60 \times 10$$^{-19}$$ \ \mathrm{C}$$ over $$1.00 \times 10$$^{-10}$$ \ \mathrm{m}$$, what is its dipole moment in Debye? ($$1 \ \mathrm{D} = 3.336 \times 10$$^{-30}$$ \ \mathrm{C} \cdot \mathrm{m})$$

$$4.80 \times 10$$^{-2}$$ \ \mathrm{D}$$

Q: An Eastern diamondback rattlesnake was milked until $$0.135 \ \mathrm{g} of $$venom was obtained. The venom was administered in equal portions to $$560$$ mice with an average weight of $$0.71 \ \mathrm{oz}$$, and exactly half the mice died. What is the $$LD_{50} (in$$ $$\mathrm{g/kg}) $$for the snake venom in mice? ($$1 \ \mathrm{kg} = 2.2046 \ \mathrm{lb}$$, $$1 \ \mathrm{lb} = 16 \ \mathrm{oz})$$

$$2.4 \times 10$$^{-1}$$ \ \mathrm{g/kg}$$

Question 1

Which of the following elements is known to have an anomalous electron configuration due to stability associated with half-filled or fully-filled subshells?

Accepted Answer

Chromium ($$Cr)$$

Question 2

A sample of chloroform has a density of $$1.4832 \ \mathrm{g/mL} at$$ $$20^\circ \mathrm{C}. $$How many milliliters are needed to obtain $$102.5 \ \mathrm{g} of $$chloroform?

Accepted Answer

$$69.12 \ \mathrm{mL}$$

Question 3

Which of the following best describes the difference between accuracy and precision in a set of measurements?

Accepted Answer

Accuracy refers to how close measurements are to the true value, while precision refers to how close measurements are to each other.

Question 4

If $$1.4\% of $$the mass of a human body is calcium, how many kilograms of calcium are present in a $$173-$$pound person? ($$1 \ \mathrm{kg} = 2.2046 \ \mathrm{lb})$$

Accepted Answer

$$1.1 \ \mathrm{kg}$$

Question 5

How many significant figures are in the answer to the calculation $$23.1 + 0.5588 + 17$$?

Accepted Answer

Two

Question 6

Convert $$-28.0^\circ \mathrm{F} to $$Celsius using the formula $$T(^\circ \mathrm{C}) = \frac{5}{9} 	imes (T(^\circ \mathrm{F}) - 32).$$

Accepted Answer

$$-33.3^\circ \mathrm{C}$$

Question 7

Convert $$1 \ \mu\mathrm{m} to $$meters.

Accepted Answer

$$1 	imes 10$$^{-6}$$ \ \mathrm{m}$$

Question 8

At room temperature, an element is shiny, silver-colored, and shatters when struck with a hammer. It is a poor conductor of electricity. What type of element is this most likely to be?

Accepted Answer

Semimetal (metalloid)

Question 9

Which group of elements does the shaded area in the periodic table (Group 1) indicate?

Accepted Answer

Alkali metals

Question 10

How many atoms of copper are in a penny made of pure copper (atomic number $$29) $$and weighing $$2.15 \ \mathrm{g}$$? ($$N_A = 6.022 	imes 10$$^{23}$$ \ \mathrm{atoms/mol}$$, molar mass of Cu $$= 63.55 \ \mathrm{g/mol})$$

Accepted Answer

$$2.04 	imes 10$$^{22}$$ atoms

Question 11

Which orbital-filling diagram represents the anomalous ground state of chromium ($$Cr$$)?

Accepted Answer

$$[Ar] \ 4s^1$ \ 3d^5$

Question 12

For the fourth-shell orbital shown below, what are the principal quantum number $$n$$ and the angular momentum quantum number $$l$$?

Accepted Answer

$$n = 4, \ l = 2$$

Question 13

Which of the following is NOT a valid set of quantum numbers?

Accepted Answer

$$n = 3, \ l = 2, \ m_l = 3, \ m_s = 1/2$$

Question 14

Arrange the following spectral regions in order of increasing energy: microwave, infrared, visible, ultraviolet.

Accepted Answer

microwave \u003c infrared \u003c visible \u003c ultraviolet

Question 15

Write the electron configuration of nickel ($$Ni$$, atomic number $$28) $$using shorthand notation.

Accepted Answer

$$[Ar] \ 4s^2$ \ 3d^8$

Question 16

A dipole moment ($$\mu) is $$calculated as the product of charge ($$Q) $$and distance. If a molecule has a charge separation of $$1.60 	imes 10$$^{-19}$$ \ \mathrm{C}$$ over $$1.00 	imes 10$$^{-10}$$ \ \mathrm{m}$$, what is its dipole moment in Debye? ($$1 \ \mathrm{D} = 3.336 	imes 10$$^{-30}$$ \ \mathrm{C} \cdot \mathrm{m})$$

Accepted Answer

$$4.80 	imes 10$$^{-2}$$ \ \mathrm{D}$$

Question 17

Which of the following elements has the largest atomic radius?

Accepted Answer

Potassium ($$K)$$

Question 18

Given the following spheres: $$r = 215 \ \mathrm{pm}$$, $$r = 197 \ \mathrm{pm}$$, $$r = 114 \ \mathrm{pm}$$, which represents a $$Sr$$ atom, a $$Br$$ atom, and a $$Ca$$ atom?

Accepted Answer

$$Sr (215 pm$$) \u003e $$Br (197 pm$$) \u003e $$Ca (114 pm)$$

Question 19

An Eastern diamondback rattlesnake was milked until $$0.135 \ \mathrm{g} of $$venom was obtained. The venom was administered in equal portions to $$560$$ mice with an average weight of $$0.71 \ \mathrm{oz}$$, and exactly half the mice died. What is the $$LD_{50} (in$$ $$\mathrm{g/kg}) $$for the snake venom in mice? ($$1 \ \mathrm{kg} = 2.2046 \ \mathrm{lb}$$, $$1 \ \mathrm{lb} = 16 \ \mathrm{oz})$$

Accepted Answer

$$2.4 	imes 10$$^{-1}$$ \ \mathrm{g/kg}$$

General Chemistry I: Atomic Structure, Units, Periodic Table, and Measurement

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