A chemist wants to extract copper metal from copper chloride solution. The chemist places 0.25 grams of aluminum foil in a solution of 0.40 grams of copper (II) chloride. A single replacement reaction takes place. What are the likely observations when the reaction stops? Unbalanced equation: CuCl2 + Al → AlCl3 + Cu About 0.90 grams of copper is formed, and some aluminum is left in the reaction mixture. About 0.20 grams of copper is formed, and some aluminum is left in the reaction mixture. About 0.90 grams of copper is formed, and some copper chloride is left in the reaction mixture. About 0.20 grams of copper is formed, and some copper chloride is left in the reaction mixture.

About 0.20 grams of copper is formed, and some aluminum is left in the reaction mixture

Explanation:

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Approximately 0.36 grams, because copper (II) chloride acts as a limiting reactant

Explanation:

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

yes the answer is total mass in unchanged   : )