Two compounds are mixed. which statement is true if there is only a physical reaction? a. the color changes. b. heat is released. c. the mixture precipitates. d. no changes occur.

Arock can be broken down into different kinds of substances by physical processes. no chemical reactions are needed to separate different parts of a rock into pure substances. this is because a rock is a(n)

Achemist 16 drop copper metal from copper chloride solution. the chemist place is 0.50 g of aluminum foil in a solution containing 0.75 g of copper (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction?

How much carbon is stored in the atmosphere as co2