Which of the following is always true when a substance undergoes a physical change a.) the composition changes b.) a change in color occurs c.) no new substance is formed d.) it's specific gravity remains the same

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

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

How many lone pairs of electrons are on the central atom of no3- and what is the molecular shape? one, trigonal planar zero, trigonal pyramidal zero, trigonal planar one, tetrahedral one, trigonal pyramidal