Q: How many atoms are present in 2 moles of sodium ($$\mathrm{Na}$$)? (Avogadro's number $$= 6.022 \times 10$$^{23}$$ atoms/mol)

$$1.204 \times 10$$^{24}$$ atoms

Q: A patient is given 0.5 moles of glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6). $$How many molecules of glucose did they receive? (Avogadro's number $$= 6.022 \times 10$$^{23}$$)

$$3.011 \times 10$$^{23}$$ molecules

Question 1

Which of the following elements has exactly 5 valence electrons in its ground state?

Accepted Answer

Nitrogen (N)

Question 2

According to the octet rule, which ion is most likely formed by magnesium (Mg)?

Accepted Answer

$$\mathrm{Mg}^{2+}$$

Question 3

A neutral atom of chlorine has 17 protons and 18 electrons. What is the symbol for this ion?

Accepted Answer

$$\mathrm{Cl}^{-}$$

Question 4

Which of the following compounds is ionic?

Accepted Answer

NaCl

Question 5

What is the correct name for the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 6

Given the ions $$\mathrm{Ca}^{2+}$$ and $$\mathrm{NO}_3$$^{-}$$, what is the correct formula for the resulting ionic compound?

Accepted Answer

$$\mathrm{Ca(NO}_3)_2$$

Question 7

Which of the following molecules has a bent shape according to VSEPR theory?

Accepted Answer

H$$_2O$$

Question 8

How many moles are present in 18 grams of water ($$\mathrm{H}_2\mathrm{O}$$)? (Molar mass of $$\mathrm{H}_2\mathrm{O} = 18 g/$$mol)

Accepted Answer

1 mole

Question 9

Which of the following statements best describes the difference between ionic and covalent compounds?

Accepted Answer

Ionic compounds transfer electrons, covalent compounds share electrons.

Question 10

What is the molecular geometry of ammonia ($$\mathrm{NH}_3) $$according to VSEPR theory?

Accepted Answer

Trigonal pyramidal

Question 11

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

CO$$_2$$

Question 12

How many atoms are present in 2 moles of sodium ($$\mathrm{Na}$$)? (Avogadro's number $$= 6.022 	imes 10$$^{23}$$ atoms/mol)

Accepted Answer

$$1.204 	imes 10$$^{24}$$ atoms

Question 13

Which of the following is the correct Lewis structure for methane ($$\mathrm{CH}_4$$)?

Accepted Answer

A central C atom with four single bonds to four H atoms

Question 14

What is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_4$$

Question 15

A patient is given 0.5 moles of glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6). $$How many molecules of glucose did they receive? (Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$3.011 	imes 10$$^{23}$$ molecules

Question 16

Which of the following ions is polyatomic?

Accepted Answer

$$\mathrm{SO}_4$$^{2-}$$

Question 17

What is the molar mass of carbon dioxide ($$\mathrm{CO}_2$$)? (C = 12.01 g/mol, O = 16.00 g/mol)

Accepted Answer

44.01 g/mol

Question 18

Which of the following best predicts the polarity of a molecule?

Accepted Answer

Both the bond polarities and the molecular shape

Question 19

Which of the following elements is most electronegative?

Accepted Answer

Fluorine (F)

Question 20

A transition metal forms a compound with the formula $$\mathrm{CuO}. $$What is the oxidation state of copper in this compound?

Accepted Answer

+2

Chapter 3 Study Guide: Atomic Structure, Bonding, and Molecular Properties

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