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When you heat the air inside a hot air balloon, it rises. Why does this occur?
A.
The volume of the balloon decreases.
B.
The hot air inside the balloon becomes less dense than the air outside the balloon.
C.
The hot air inside the balloon becomes denser than the air outside the balloon.
D.
The mass of cold air displaced by the balloon is less than the mass of hot air inside the balloon.

Temperature and kinetic energy are proportional. a) adirectly b) directly c) indirectly

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant