A substance made up of two or more types of atoms that are NOT chemically combined is called a(n) A
element
B
mixture
с
compound
D
pure substance

What is the ph of a solution with a 1.50 × 10−9 m hydroxide ion concentration?

You have a sample of a gas that occupies a volume of 17ml at -111 degrees celsius. what volume does the sample occupy at 88 degrees celsius? show all work asap

What is the percent by mass of oxygen in fe2o3