General Chemistry 2 Quiz

What is the field of chemistry that deals particularly with the chemical and electrical energy involved in chemical reactions?

• Analytical Chemistry

• Physical Chemistry

• Inorganic Chemistry

• Electrochemistry

Answer explanation

Electrochemistry is the field of chemistry that deals particularly with the chemical and electrical energy involved in chemical reactions.

In a redox reaction, what happens during oxidation?

• Transfer of protons

• Gain of electrons

• Loss of electrons

• No change in electrons

Answer explanation

During oxidation in a redox reaction, there is a loss of electrons from the substance undergoing oxidation.

What is the oxidation state of uncombined atoms of an element?

• +2

• -1

• +1

• 0

Answer explanation

The oxidation state of uncombined atoms of an element is always 0, as there is no sharing or transfer of electrons in a neutral atom.

Which element is assigned an oxidation state of +1 in covalent compounds?

• Carbon

• Sulfur

• Hydrogen

• Oxygen

Answer explanation

Hydrogen is assigned an oxidation state of +1 in covalent compounds due to its electronegativity and tendency to lose an electron.

What is the oxidation state of oxygen in most covalent compounds it forms?

• +2

• -2

• -1

• +1

Answer explanation

In most covalent compounds, oxygen has an oxidation state of -2, as it tends to gain two electrons to achieve a stable octet configuration.

In the reaction 2 Na (s) + Cl2 (g) → 2 NaCl (s), what is the oxidation state change for sodium (Na)?

• 0 to -1

• -1 to 0

• +1 to 0

• 0 to +1

Answer explanation

The oxidation state of sodium changes from 0 to +1 because it loses an electron during the reaction, going from a neutral state to a +1 charge in NaCl.

Which mnemonic is commonly used by students to remember the concepts of oxidation and reduction?

• SALT

• BOLT

• OIL RIG

• FIRE

Answer explanation

The mnemonic commonly used by students to remember the concepts of oxidation and reduction is OIL RIG, making it the correct choice.

What is the sum of the oxidation states of all atoms in a compound?

• -1

• 0

• 2

• 1

Answer explanation

The sum of the oxidation states of all atoms in a compound is always 0 due to the conservation of charge principle.

Which type of reaction involves the transfer or exchange of ions without changes in oxidation states?

• Decomposition reaction

• Ionic reaction

• Combination reaction

• Redox reaction

Answer explanation

Ionic reaction involves the transfer or exchange of ions without changes in oxidation states, making it the correct choice.

What is the basis for determining whether a reaction is a redox reaction?

• Changes in pressure

• Changes in temperature

• Changes in oxidation states

• Changes in color

Answer explanation

The basis for determining whether a reaction is a redox reaction is changes in oxidation states.