Which statement is true for a pure compound

but NOT true for a pure element?

When heated KClO3 decomposes into KCl and O2 if this reaction produced 31.9 g of KCl how much O2 was produced in grams

Electrolysis uses electrical current to break water molecules into oxygen gas and hydrogen gas. How do you know that this is a chemical change?

Which statement about a reaction is not correct? A. The free energy of a reaction depends on the amount and direction of entropy and heat changes. B. If a reaction is exothermic and increases entropy, then the reaction is spontaneous. C.

How many molecules of benzene (C6H6) are in 17.4 g of benzene? (Show ALL work and answer with correct significant figures and units.)

A term that means a change in velocity

What do you use to measure mass

A salt shaker filled with 17.0g sodium chloride contain how many moles?

When a radioactive decay occurs what is released? A. Only protons and neutrons B. Only electrons C. Protons/Neutrons, beta particle, gamma ray D. Only gamma rays

How is the process of scientific inquiry and the design process similar and how they are different.

Provide an explanation at the subatomic level to explain why different colors are observed for different metal salts.