Which of the following combinations of reactants will result in a synthesis reaction? (2 points) 2points a cl2 + hbr b ca + h2o c mgo + h2o d c2h2 + o2

The answer is: C) MgO + H2O.

Balanced chemical reaction: MgO + H₂O → Mg(OH)₂.

Synthesis reaction is a type of reaction in which multiple reactants combine to form a single product.

In this chemical reaction magnesium oxide and water react anf form magnesium hydroxide.

Other examples are not synthesis reactions.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

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.