Question

baco₃ is used in ceramic glazes and cement. which of the following gives the correct formula and bonding for baco₃?

○ barium carbon trioxide; covalent

○ barium carbide; covalent

○ barium(ii) carbonate; ionic

○ barium carbonate; ionic

Explanation:

1. Naming the Compound: \( \text{BaCO}_3 \) consists of the barium cation (\( \text{Ba}^{2+} \)) and the carbonate anion (\( \text{CO}_3^{2-} \)). The correct name is "barium carbonate" (since barium has a +2 charge, and carbonate is a polyatomic ion; the "(II)" is unnecessary here as barium typically has a +2 charge, and the common name is barium carbonate).
2. Bonding Type: Barium is a metal, and carbonate is a polyatomic ion. Compounds formed between metals and polyatomic ions (or non - metals) are ionic, as electrons are transferred from the metal to the anion. Covalent bonding involves sharing of electrons, which is not the case here (barium donates electrons to carbonate).

So, we eliminate the options with incorrect names (barium carbon trioxide, barium carbide) and the one with incorrect bonding (the covalent ones) or unnecessary naming (barium(II) carbonate is not the common/most correct naming here).

Answer:

D. barium carbonate; ionic (assuming the options are labeled A - D as per the order: 1. barium carbon trioxide; covalent, 2. barium carbide; covalent, 3. barium(II) carbonate; ionic, 4. barium carbonate; ionic)