Question 1

Which of the following statements best describes the difference between a molecule and a compound?

Accepted Answer

A molecule consists of two or more atoms held together by covalent bonds, while a compound consists of two or more different elements combined in a fixed ratio.

Question 2

Given the periodic table block for carbon (atomic number 6, atomic mass 12.011), how many neutrons does the most common isotope of carbon have?

Accepted Answer

$$6$$

Question 3

Which of the following best explains why noble gases are chemically inert?

Accepted Answer

Their valence shells are completely filled with electrons.

Question 4

How many electrons are in the second shell of a neon atom ($$	ext{Ne}$$, atomic number 10)?

Accepted Answer

$$8$$

Question 5

Which of the following is a property of ionic compounds (salts)?

Accepted Answer

They are typically stable when dry but dissociate easily in water.

Question 6

A radioactive isotope has a half-life of 2 hours. If you start with 80 grams, how much will remain after 6 hours?

Accepted Answer

$$10$$ grams

Question 7

Which of the following best describes a polar covalent bond?

Accepted Answer

One atom is more electronegative, causing unequal sharing of electrons.

Question 8

What is the electron configuration for a carbon atom (atomic number 6)?

Accepted Answer

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

Question 9

Which of the following intermolecular forces is responsible for the ability of geckos to climb walls?

Accepted Answer

Van der Waals interactions

Question 10

Which statement about chemical reactions is correct?

Accepted Answer

At equilibrium, the concentrations of reactants and products do not change.

Question 11

Which of the following best describes hybridization in the context of molecular bonding?

Accepted Answer

It is the combination of s and p orbitals to form new, hybrid orbitals.

Question 12

Which of the following is NOT one of the four essential elements that make up approximately 96% of living matter?

Accepted Answer

Calcium

Question 13

Which of the following best explains why water molecules are polar?

Accepted Answer

Oxygen is more electronegative than hydrogen, causing unequal sharing of electrons.

Question 14

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its atomic mass?

Accepted Answer

$$35$$

Question 15

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom covalently bonded to an electronegative atom and another electronegative atom.

Question 16

Which of the following is a trace element required by living organisms?

Accepted Answer

Iron

Question 17

Which of the following best describes the role of electrons in chemical bonding?

Accepted Answer

Valence electrons in the outermost shell are responsible for bonding.

Question 18

A sodium atom transfers an electron to a chlorine atom. What type of bond is formed between the resulting ions?

Accepted Answer

Ionic bond

Question 19

Which of the following best describes the relationship between atomic number and the identity of an element?

Accepted Answer

The atomic number is the number of protons, which determines the element.

Question 20

Which of the following is true about isotopes?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Atoms, Elements, and Chemical Bonds: Foundations of Biological Chemistry

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드