Question

question 20
1 pts
the products of an acid - base reaction are often a_.
acid and base
salt and water
anion and water
cation and water

question 21
1 pts
reactions involving oxygen as a reactant or product are known as_.
precipitation reactions
transmogrification reactions
neutralization reactions
oxidation - reduction reactions

Explanation:

• For Question 20: Acid - base reactions (neutralization reactions) generally follow the formula \( \text{acid}+\text{base}\to\text{salt}+\text{water}\). For example, \( \text{HCl (acid)}+\text{NaOH (base)}\to\text{NaCl (salt)}+\text{H}_2\text{O (water)}\).
• For Question 21: Oxidation - reduction reactions (redox reactions) involve the transfer of electrons. Oxygen is often involved in these reactions. For example, in the reaction \( 2\text{H}_2+\text{O}_2\to 2\text{H}_2\text{O}\), hydrogen is oxidized (loses electrons) and oxygen is reduced (gains electrons). Precipitation reactions form a solid (precipitate), neutralization reactions are acid - base reactions (as in Question 20), and “transmogrification reactions” is not a standard chemical reaction term.

Answer:

Question 20: B. salt and water
Question 21: D. oxidation - reduction reactions