Which layer of the atmosphere contains almost 80% of the atmospheres total mass

A sample of diborane gas a substance that bursts into flame when exposed to air, has a pressure of 345 tore at a temperature of - 15C and a volume of 3.48 L.

Ionic bonds are formed between metals and non-metals to form salts. a. True b. False

A chemist adds 50.0ML of a 0.20 mol/l sodium chloride solution to a reaction flask. Calculate the millimoles of sodium chloride the chemist has added to the flask. Round your answer to 2 significant digits.

What could people do in order to make nonrenewable resources last longer?

A physical property can be observed or measured without changing the identity of a substance. Which of these choices describes a physical property? The temperature at which a liquid will boil. The tendency of a substance to explode.

Assign the oxidation number for (NH4) 3PO4

When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place?

Do pure substances have the same chemical and physical properties

How is matter conserved in a chemical reaction

Define Percent transmittance