Question

hydrogen gas (h₂) and oxygen gas (o₂) react to form liquid hydrogen peroxide (h₂o₂). which statement is true about the reaction?
a. the atoms of the reactants have combined to form a new substance.
b. the product that is formed has the same physical properties as the reactants.
c. the two gases have mixed together, but a new substance has not formed.
d. the same atoms are present, so the chemical properties are the same.

Explanation:

In a chemical reaction like hydrogen gas and oxygen gas reacting to form hydrogen peroxide, atoms of reactants combine to create a new substance with different physical and chemical properties. Option A correctly describes this. Option B is wrong as products have different physical properties. Option C is incorrect since a new substance is formed. Option D is false because although the same atoms are present in a sense, the way they are bonded gives the product different chemical properties.

Answer:

A. The atoms of the reactants have combined to form a new substance.