Explanation:
Ethane: H₃C-CH₃. There is one C-C single bond and six C-H single bonds, total 7 covalent bonds. Each bond is a sigma bond. The structural formula shows 7 bonds. Methane has 4, propane 10. Counting bonds is simple: each line represents a covalent bond.
Explanation:
Diamond, with its tetrahedral covalent network, is the hardest known natural material (Mohs 10). Graphite is soft; quartz is SiO₂, hardness 7.
Explanation:
Distilled water is produced by boiling water and condensing the steam, leaving behind non-volatile impurities like salts, minerals, and most contaminants. It is almost pure H₂O. Deionized water also has salts removed. However, it may absorb CO₂ and become slightly acidic. It is used in laboratories and batteries.
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