Question

according to the law of conservation of matter, we know that the total number of atoms does not change in a chemical reaction and thus mass is conserve this is part of a chemical reaction: hydrogen plus oxygen yields water. can you complete this model? reorganize the reactants in order to complete the product side of the reaction.

Explanation:

Step1: Write the chemical equation

The chemical reaction is \(2H_2 + O_2
ightarrow 2H_2O\).

Step2: Analyze the number of atoms

On the reactant side, there are \(4\) hydrogen atoms (\(2H_2\)) and \(2\) oxygen atoms (\(O_2\)).

Step3: Check the products

For water (\(H_2O\)), each molecule has \(2\) hydrogen atoms and \(1\) oxygen atom. To balance the equation, we need \(2\) water molecules (\(2H_2O\)) which gives \(4\) hydrogen atoms (\(2\times2\)) and \(2\) oxygen atoms (\(2\times1\)).

Answer:

B.