Question

criss cross method/ionic formulas learning check
identify if each compound is ionic or covalent:
cacl₂
co₂
h₂o
ch₄
cas
libr

Explanation:

Step1: Identify ionic compounds

Ionic compounds are formed between metals and non - metals.

• \(CaCl_{2}\): \(Ca\) (metal) and \(Cl\) (non - metal) → ionic.
• \(CaS\): \(Ca\) (metal) and \(S\) (non - metal) → ionic.
• \(LiBr\): \(Li\) (metal) and \(Br\) (non - metal) → ionic.

Step2: Identify covalent compounds

Covalent compounds are formed between non - metals.

• \(CO_{2}\): \(C\) and \(O\) (both non - metals) → covalent.
• \(H_{2}O\): \(H\) and \(O\) (both non - metals) → covalent.
• \(CH_{4}\): \(C\) and \(H\) (both non - metals) → covalent.

Answer:

\(CaCl_{2}\): ionic
\(CO_{2}\): covalent
\(H_{2}O\): covalent
\(CH_{4}\): covalent
\(CaS\): ionic
\(LiBr\): ionic