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.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.