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

1. About 0.90 grams of copper is formed, and some aluminum is left in the reaction mixture.
2. About 0.20 grams of copper is formed, and some aluminum is left in the reaction mixture.
3. About 0.90 grams of copper is formed, and some copper chloride is left in the reaction mixture.
4. About 0.20 grams of copper is formed, and some copper chloride is left in the reaction mixture.

the answers would be

the first one and the second one

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

football

explanation:

because it is