Q: According to the de Broglie equation, what is the wavelength ($$\lambda) of a$$ $$1.0\ \mathrm{kg}$$ object moving at $$2.0\ \mathrm{m/s}$$? ($$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s})$$

$$3.3 \times 10$$^{-34}$$\ \mathrm{m}$$

Question 1

Which of the following statements best describes an intensive property of matter?

Accepted Answer

It is independent of the amount of substance present, such as density or boiling point.

Question 2

A sample of a compound contains 12.0 g of carbon and 32.0 g of oxygen. What is the empirical formula of the compound?

Accepted Answer

CO2

Question 3

Which of the following best describes the difference between a physical and a chemical change?

Accepted Answer

A chemical change involves a change in the composition of a substance, while a physical change does not.

Question 4

A student measures the temperature of a solution as $$25.0\ ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$298.2\ \mathrm{K}$$

Question 5

Which of the following is the correct electron configuration for the $$\mathrm{O}^{2-}$$ ion?

Accepted Answer

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

Question 6

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of water. How many moles of water are present?

Accepted Answer

$$0.500\ \mathrm{mol}$$

Question 7

Which of the following elements is a metalloid?

Accepted Answer

Silicon ($$\mathrm{Si})$$

Question 8

Which of the following best explains why the first ionization energy generally increases across a period from left to right?

Accepted Answer

The effective nuclear charge ($$Z_{\mathrm{eff}}) $$increases, pulling electrons closer to the nucleus.

Question 9

A hydrogen atom undergoes a transition from $$n=4 to$$ $$n=2. $$Which region of the electromagnetic spectrum is the photon emitted in?

Accepted Answer

Visible

Question 10

Which of the following sets of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$$n=2,\ l=2,\ m_l=0$$

Question 11

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy can neither be created nor destroyed, only transformed from one form to another.

Question 12

A 10.0 g sample of a metal is heated from $$25.0\ ^\circ\mathrm{C} to$$ $$75.0\ ^\circ\mathrm{C}$$, absorbing $$500\ \mathrm{J} of $$heat. What is the specific heat capacity of the metal?

Accepted Answer

$$0.50\ \mathrm{J/g\cdot ^\circ C}$$

Question 13

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 14

Which of the following elements exists as a diatomic molecule in its natural state?

Accepted Answer

Nitrogen ($$\mathrm{N}_2)$$

Question 15

A sample of chlorine gas has a mass of 70.90 g. How many moles of chlorine molecules ($$\mathrm{Cl}_2) $$are present? (Molar mass of $$\mathrm{Cl}_2 = 70.90\ \mathrm{g/mol})$$

Accepted Answer

$$1.00\ \mathrm{mol}$$

Question 16

Which of the following best describes the effect of shielding and penetration on the energy of atomic sublevels?

Accepted Answer

Greater shielding increases the energy of outer electrons, while greater penetration decreases it.

Question 17

Which of the following ions has the same electron configuration as neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na}^+$$

Question 18

According to the de Broglie equation, what is the wavelength ($$\lambda) of a$$ $$1.0\ \mathrm{kg}$$ object moving at $$2.0\ \mathrm{m/s}$$? ($$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s})$$

Accepted Answer

$$3.3 	imes 10$$^{-34}$$\ \mathrm{m}$$

Question 19

Which of the following best explains the deviation in ionization energy between Group 2A and 3A elements?

Accepted Answer

The 3A element's outer electron is in a higher energy p orbital, which is easier to remove than the s orbital electron in 2A.

General Chemistry I: Matter, Energy, and Atomic Structure – Exam 1 Study Guide

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