Which of the following is not a potential sign of a chemical change?

a) release of gas
b) evaporation of water
c) change of color
d) production of gas

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 of the following is described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating

How many moles are in 1.26*10^24 particles in significant figures