$$\text{Atomic Mass} - \text{Atomic Number}$$

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy}$$

Question 1

Which subatomic particle is responsible for the identity of an element and is found in the nucleus?

Accepted Answer

Proton

Question 2

How many electrons can the second energy level of an atom hold?

Accepted Answer

$$8$$

Question 3

A neutral atom of carbon has an atomic number of $$6$$ and an atomic mass of $$12. $$How many neutrons does it have?

Accepted Answer

$$6$$

Question 4

Which type of bond involves the sharing of electrons between atoms?

Accepted Answer

Covalent bond

Question 5

Water is considered a polar molecule because:

Accepted Answer

Oxygen pulls electrons more strongly than hydrogen, creating partial charges

Question 6

Which property of water allows insects to walk on its surface, as shown in the image?

Accepted Answer

Cohesion

Question 7

If sodium ($$Na) $$loses one electron, what is its resulting charge?

Accepted Answer

$$+1$$

Question 8

Which of the following best describes an isotope?

Accepted Answer

Atoms with different numbers of neutrons

Question 9

What is the correct formula to calculate the number of neutrons in an atom?

Accepted Answer

$$	ext{Atomic Mass} - 	ext{Atomic Number}$$

Question 10

Which of the following is a real-life example of an ionic bond?

Accepted Answer

Table salt ($$NaCl)$$

Question 11

Why does water have a high specific heat capacity?

Accepted Answer

Because it forms many hydrogen bonds

Question 12

Which of the following solutions has the highest concentration of hydrogen ions ($$H^+$$)?

Accepted Answer

Soda ($$pH = 3)$$

Question 13

What is the role of water as a solvent in biological systems?

Accepted Answer

It provides a medium for chemical reactions due to its polarity

Question 14

Which of the following best explains why water forms a meniscus in a graduated cylinder?

Accepted Answer

Adhesion between water and glass

Question 15

A molecule of $$H_2O is $$held together by which type of bond?

Accepted Answer

Covalent bond

Question 16

Which of the following is true about acids?

Accepted Answer

They increase the concentration of $$H^+$$ ions in solution

Question 17

What is the main difference between a compound and a molecule?

Accepted Answer

A compound is made of two or more different elements, while a molecule can be made of the same or different elements

Question 18

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a hydrogen atom and a highly electronegative atom

Question 19

Which of the following chemical equations correctly represents cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}$$

Question 20

If an atom has 10 electrons, how are they distributed among the energy levels?

Accepted Answer

2 in the first, 8 in the second, 0 in the third

Fundamental Concepts in General Chemistry: Atoms, Elements, Bonding, Water, and Chemical Equations

Study Guide - Practice Questions