review each of the chemical compounds and classify each one based on whether it contains an ionic or a covalent bond. covalent ionic cf4 ni3 k2o nh4br c5h10o5 ba(oh)2

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# Brief Explanations:
- **Covalent bonds**: Formed between non - metals. In $CF_4$, carbon ($C$) and fluorine ($F$) are non - metals. In $NI_3$, nitrogen ($N$) and iodine ($I$) are non - metals. In $C_5H_{10}O_5$, carbon ($C$), hydrogen ($H$), and oxygen ($O$) are non - metals.
- **Ionic bonds**: Formed between a metal and a non - metal (or a polyatomic ion which has ionic character). In $K_2O$, potassium ($K$) is a metal and oxygen ($O$) is a non - metal. In $NH_4Br$, the ammonium ion ($NH_4^+$) and bromide ion ($Br^-$) form an ionic bond. In $Ba(OH)_2$, barium ($Ba$) is a metal and the hydroxide ion ($OH^-$) is a polyatomic ion.

# Answer:
- **Covalent**: $CF_4$, $NI_3$, $C_5H_{10}O_5$
- **Ionic**: $K_2O$, $NH_4Br$, $Ba(OH)_2$

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