Question 1

A patient receives a dose of a radioactive isotope for imaging. If the initial activity is 120 mCi and the isotope has a half-life of 6 hours, how much activity remains after 18 hours?

Accepted Answer

$$ 15 	ext{ mCi} $$

Question 2

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their outer shell.

Question 3

What is the charge of a magnesium ion after it loses two electrons?

Accepted Answer

$$ +2 $$

Question 4

Which formula represents an ionic compound formed between sodium and chloride?

Accepted Answer

$$ 	ext{NaCl} $$

Question 5

Which of the following is a binary covalent compound?

Accepted Answer

$$ 	ext{CO}_2 $$

Question 6

Given the formula $$ 	ext{N}_2	ext{O}_4 $$, what is the correct name for this compound?

Accepted Answer

Dinitrogen tetroxide

Question 7

Which statement correctly compares covalent and ionic compounds?

Accepted Answer

Covalent compounds share electrons, while ionic compounds transfer electrons.

Question 8

Which pair of elements will most likely form an ionic compound?

Accepted Answer

Sodium and chlorine

Question 9

What is the correct formula for a compound formed between aluminum and oxygen?

Accepted Answer

$$ 	ext{Al}_2	ext{O}_3 $$

Question 10

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases across a period from left to right.

Question 11

Which molecule is polar?

Accepted Answer

$$ 	ext{H}_2	ext{O} $$

Question 12

Which type of intermolecular force is strongest in water?

Accepted Answer

Hydrogen bonding

Question 13

A nurse needs to convert 2.5 g of a medication to mg for a dosage calculation. What is the correct conversion?

Accepted Answer

$$ 2500 	ext{ mg} $$

Question 14

Which of the following best describes a nonpolar molecule?

Accepted Answer

A molecule with an even distribution of charge and no net dipole moment.

Question 15

Which of the following is the correct name for $$ 	ext{PCl}_3 $$?

Accepted Answer

Phosphorus trichloride

Question 16

If a compound is formed between potassium and bromine, what is its formula?

Accepted Answer

$$ 	ext{KBr} $$

Question 17

Which of the following is a common misconception about ionic compounds?

Accepted Answer

They are formed by sharing electrons.

Question 18

Which element has the highest electronegativity?

Accepted Answer

Fluorine

Question 19

Which intermolecular force is present in all molecules, regardless of polarity?

Accepted Answer

London dispersion forces

Question 20

A radioactive isotope has a half-life of 4 hours. If you start with 80 g, how much remains after 12 hours?

Accepted Answer

$$ 10 	ext{ g} $$

Final Exam Objectives: Key Concepts in General, Organic, and Biological Chemistry

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