Copper(I) sulfide (Cu2S) is synthesized in a reaction described by this chemical equation: 2Cu(s) + S(s) → Cu2S(s)

A ratio of 2:1 applies to the that enter into the reaction.

a. volumes of gases

b. number of molecules

c. number of atoms

d. masses of the reactants

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What are the 4 phases of matter in order of increasing engery content?

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining

Sandy is building a small toy car. he wants to use a balloon to power the toy car. he fills a balloon with air and then attaches a straw to the balloon. he tapes the balloon-straw combination to the car and then releases the end of the balloon. the toy moves forward as the air from the balloon comes out the back of the straw. what can sandy do to make the toy car move faster? a) use less air in the balloon. b) blow up the balloon more. c) use a longer straw. d) use larger tires.