A piece of chalk (CaCO3) has an initial mass of 43.5 grams. The massof the chalk decreased to 39.6 grams after it was used. Which of these is the closest value to the amount of chalk used?

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

Can someone me with 3 and 4 plz. this is for masteries test.

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride