Question
Use the information in this table to answer questions about hydroxides and oxides. Name of chemical & Can it neutralise an acid? & Does it dissolve in water? Sodium hydroxide & Yes & Yes Copper oxide & Yes & No Calcium hydroxide & Yes & Yes Silicon dioxide & No & No a) Which of the substances are alkalis? Select all correct answers Sodium hydroxide Copper oxide Calcium hydroxide Silicon diox b) Which of the substances are bases? Select all correct answers Sodium hydroxide Copper oxide Calcium hydroxide Silicon diox
Answer
4.3
(254 Votes)
Jessica
Expert · Tutor for 3 years
Answer
a) The alkalis are Sodium hydroxide and Calcium hydroxide.b) The bases are Sodium hydroxide, Copper oxide, and Calcium hydroxide.
Explanation
## Step 1: Understanding the definitionsAn alkali is a base that can dissolve in water. Therefore, to be an alkali, a substance must both be able to neutralise an acid and dissolve in water. A base, on the other hand, is a substance that can neutralise an acid, regardless of whether it can dissolve in water or not.## Step 2: Identifying the alkalisFrom the table, we can see that Sodium hydroxide and Calcium hydroxide both neutralise an acid and dissolve in water. Therefore, they are alkalis.## Step 3: Identifying the basesFrom the table, we can see that Sodium hydroxide, Copper oxide, and Calcium hydroxide all neutralise an acid, regardless of whether they dissolve in water or not. Therefore, they are bases.