What activates a convection current the start of the flow of a liqued

What is the mass of a paperclip?

Which source of energy causes most of the water evaporation on Earth's surface? A. Wind B. Solar C. Gravity D. Electrical

Elemental phosphorus reacts with chlorine gas according to the equation p4 (s) + 6cl2 (g) →4pcl3 (l) a reaction mixture initially contains 45.77 g p4 and 130.0 g cl2.

SO3 is an empirical formula for which of the following?

What is one chemical property of iron? A) Iron is malleable. B) The density of iron is 7.86 g/cc. C) Iron combines readily with oxygen. D) Iron is a good conductor of electricity and heat.

Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? a. Nitrogen b. Oxygen c. Argon

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as (1) an ionic compound (2) a molecular compound (3) a metal (4) a nonmetal

What is done with the reactive sodium after the reaction to make sure the products are safe in an air bag?

Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution

Reactions cannot occur without a certain minimum amount of energy. what is this minimum amount of energy called?