Q: Suppose the velocity of an electron in an atom is known to have an uncertainty of $$1.00 \times 10^6$\ \mathrm{m/s}. $$What is the minimum uncertainty in its position in meters? (Use $$m_e = 9.109 \times 10$$^{-31}$$\ \mathrm{kg}$$, $$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s})$$

$$5.79 \times 10$$^{-9}$$\ \mathrm{m}$$

Question 1

Which of the following is the correct electron configuration for a neutral calcium atom ($$Z=20$$)?

Accepted Answer

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

Question 2

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 3

What is the definition of density?

Accepted Answer

Mass per unit volume

Question 4

Which of the following is NOT a chemical change?

Accepted Answer

Dissolving sugar in water

Question 5

Which is an intensive property?

Accepted Answer

Density

Question 6

Which of the following is the SMALLEST energetic transition for a hydrogen atom?

Accepted Answer

$$n=3 to$$ $$n=2$$

Question 7

Which of the following is a proper set of quantum numbers for the ground state electron in a hydrogen atom?

Accepted Answer

$$n=1,\ l=0,\ m_l=0,\ m_s=+1/2$$

Question 8

Which statement about protons, neutrons, and electrons is TRUE?

Accepted Answer

Protons and neutrons have the same mass while electrons have a different mass with the opposite charge of a proton.

Question 9

Rutherford's gold foil experiment led to which major scientific conclusion?

Accepted Answer

Led to the nuclear theory of the atom

Question 10

What is the general trend for first ionization energy on the periodic table?

Accepted Answer

First ionization energy increases going up and across from left to right on the periodic table

Question 11

Which of the following is the correct number of protons, neutrons, and electrons for the isotope $$^{40}_{20}\mathrm{Ca}$$?

Accepted Answer

20 protons, 20 neutrons, 20 electrons

Question 12

Which of the following is the correct electron configuration for $$\mathrm{Rn} ($$Radon, $$Z=86$$)?

Accepted Answer

$$[Xe] 6s^2$ 4f$$^{14}$$ 5d$$^{10}$$ 6p^6$

Question 13

Which of the following best describes the atomic number?

Accepted Answer

The number of protons in an atom

Question 14

What is the general trend for atomic radii on the periodic table?

Accepted Answer

Atomic radii decrease going up and across from left to right on the periodic table

Question 15

Which of the following statements about orbital nodes is TRUE?

Accepted Answer

All of the above

Question 16

Suppose the velocity of an electron in an atom is known to have an uncertainty of $$1.00 	imes 10^6$\ \mathrm{m/s}. $$What is the minimum uncertainty in its position in meters? (Use $$m_e = 9.109 	imes 10$$^{-31}$$\ \mathrm{kg}$$, $$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s})$$

Accepted Answer

$$5.79 	imes 10$$^{-9}$$\ \mathrm{m}$$

Question 17

Calculate the number of atoms in $$10.0\ \mathrm{mL} of Hg at $$room temperature if the density of Hg is $$13.6\ \mathrm{g/mL}.$$

Accepted Answer

$$4.08 	imes 10$$^{23}$$ atoms

Question 18

What is the wavelength (in nm) of an electron in meters traveling at $$4.11 	imes 10^6$\ \mathrm{m/s}$$? (Use $$m_e = 9.109 	imes 10$$^{-31}$$\ \mathrm{kg}$$, $$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s})$$

Accepted Answer

$$1.77 	imes 10$$^{-10}$$\ \mathrm{m}$$

Question 19

Which of the following best describes the trend for electron affinity (magnitude only, without sign) on the periodic table?

Accepted Answer

Increases going up and across from left to right

General Chemistry I: Foundational Concepts, Atomic Structure, and Periodic Properties

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