Which mineral property is being tested below? (the picture) luster density streak reaction to acid

An experimental procedure requires a 10 ml of acid to be dissolved

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa