Does chemical compound require capitalization in a lab report

not like CuNO3, but like Copper Nitrate. Do i capitalize both component?

"Copper Nitrate" and "copper nitrate" are potentially both fine, but you need to stick to the same style throughout.

Strictly speaking, the correct form is non-capitalized as copper nitrate is a common noun, not a proper noun. If you wish to convey a sense of painstaking accuracy in all things to whoever reads your report then don't capitalize unless the brief has explicitly requested that you do so.

But if you're capitalizing so that the compound names stand out better when someone speed-reads the report then it may be acceptable even if not correct. It's all about adopting the correct form of communication to suit your target audience.

yeah I use to. they are pronouns blah blah blah.... they look professional capitalised haha, that's what I think

DO NOT START WITH CAPITALS! IT WILL MAKE IT SEEM YOU ARE SHOUTING AT THE START THEN DESCENDING INTO A WHIMPER.