Q: Convert $$0.0056\ \mathrm{kg} to$$ $$\mathrm{mg}.$$

$$5.6\times 10^6$\ \mathrm{mg}$$

Q: If the frequency $$(\nu) of $$light is $$6.0\times 10$$^{14}$$\ \mathrm{Hz}$$, what is its wavelength $$(\lambda) in $$meters? (Speed of light $$c = 2.998\times 10^8$\ \mathrm{m/s})$$

$$5.00\times 10$$^{-7}$$\ \mathrm{m}$$

Q: Which of the following statements about the mole is correct?

A mole contains $$6.022\times 10$$^{23}$$ particles.

Q: A photon has a wavelength of $$4.00\times 10$$^{-7}$$\ \mathrm{m}. $$What is its energy? ($$h = 6.626\times 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 2.998\times 10^8$\ \mathrm{m/s})$$

$$4.97\times 10$$^{-19}$$\ \mathrm{J}$$

Question 1

Which of the following best describes a sample of air at sea level?

Accepted Answer

A homogeneous mixture

Question 2

Which of the following is an example of a chemical change?

Accepted Answer

Rusting of iron

Question 3

A cube has sides of length $$2.50\ \mathrm{cm}. $$What is its volume in $$\mathrm{mL}$$?

Accepted Answer

$$15.6\ \mathrm{cm}^3 ($$which equals $$15.6\ \mathrm{mL})$$

Question 4

Which of the following statements about the conservation of mass is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a closed system.

Question 5

Convert $$0.0056\ \mathrm{kg} to$$ $$\mathrm{mg}.$$

Accepted Answer

$$5.6	imes 10^6$\ \mathrm{mg}$$

Question 6

Which of the following is an intensive property?

Accepted Answer

Density

Question 7

A sample contains $$70\%$$ $$^{35}\mathrm{Cl} ($$mass $$= 34.97\ \mathrm{amu}) $$and $$30\%$$ $$^{37}\mathrm{Cl} ($$mass $$= 36.97\ \mathrm{amu}). $$What is the average atomic mass of chlorine?

Accepted Answer

$$35.50\ \mathrm{amu}$$

Question 8

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 9

What is the correct nuclear symbol for an atom with 15 protons, 16 neutrons, and 15 electrons?

Accepted Answer

$$^{31}_{15}\mathrm{P}$$

Question 10

Which of the following best describes the difference between an orbit and an orbital?

Accepted Answer

An orbit is a fixed path around the nucleus, while an orbital is a region of space with a high probability of finding an electron.

Question 11

Which of the following electron configurations represents a neutral magnesium atom ($$Z=12$$)?

Accepted Answer

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

Question 12

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

Accepted Answer

Pauli exclusion principle

Question 13

A student measures the mass of a metal cylinder as $$15.0\ \mathrm{g}$$ and its volume as $$3.0\ \mathrm{mL}. $$What is the density of the metal?

Accepted Answer

$$5.0\ \mathrm{g/mL}$$

Question 14

Which of the following electromagnetic waves has the highest frequency?

Accepted Answer

Gamma rays

Question 15

If the frequency $$(
u) of $$light is $$6.0	imes 10$$^{14}$$\ \mathrm{Hz}$$, what is its wavelength $$(\lambda) in $$meters? (Speed of light $$c = 2.998	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$5.00	imes 10$$^{-7}$$\ \mathrm{m}$$

Question 16

Which of the following is the correct noble gas configuration for potassium ($$Z=19$$)?

Accepted Answer

$$[Ar]\ 4s^1$

Question 17

Which of the following statements about the mole is correct?

Accepted Answer

A mole contains $$6.022	imes 10$$^{23}$$ particles.

Question 18

Which element is a halogen?

Accepted Answer

Chlorine

Question 19

Which of the following best explains why atomic radii decrease across a period from left to right?

Accepted Answer

The effective nuclear charge increases, pulling electrons closer to the nucleus.

Question 20

A photon has a wavelength of $$4.00	imes 10$$^{-7}$$\ \mathrm{m}. $$What is its energy? ($$h = 6.626	imes 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 2.998	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$4.97	imes 10$$^{-19}$$\ \mathrm{J}$$

CHEM 108 Exam 1 Study Guide: Foundations of Chemistry, Atomic Structure, and the Periodic Table

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