Question

read the passage and answer the following question(s).
water formation
water (h₂o) is a compound required for survival by living organisms. the diagram below shows the chemical reaction of hydrogen gas (h₂) with oxygen gas (o₂) to form water (h₂o).
chemical reaction forming water
2h₂ + o₂→2h₂o
using circles to represent the atoms. which drawing shows the model that the student should make to represent this chemical reaction?
a.
b.
c.
d.

Explanation:

Step1: Analyze reactants

The reactants are 2 molecules of hydrogen gas ($H_2$) and 1 molecule of oxygen gas ($O_2$). Each $H_2$ molecule has 2 hydrogen atoms and $O_2$ has 2 oxygen atoms.

Step2: Analyze products

The product is 2 molecules of water ($H_2O$), where each water molecule has 2 hydrogen atoms and 1 oxygen atom.

Step3: Check options

In option A, the reactants are shown as single - atom hydrogen and oxygen which is incorrect as hydrogen and oxygen are di - atomic gases. Option B has the wrong ratio of hydrogen and oxygen in the product formation. Option D also has incorrect representation of reactants as single - atom hydrogen and oxygen. Option C correctly shows 2 $H_2$ molecules (4 hydrogen atoms in pairs), 1 $O_2$ molecule (2 oxygen atoms in a pair) as reactants and 2 $H_2O$ molecules (2 hydrogen atoms and 1 oxygen atom in each) as products.

Answer:

C.