Question

how are chemical equations written? scientists express chemical reactions as equations. on the left side of the equation are the starting substances, or reactants. on the right side of the equation are the substances formed during the reaction, or the products. an arrow is between these two parts of the equation. you can read the arrow as \yield\ or
eact to form.\ the general form of a chemical equation is shown below.
reactants → products
why must chemical equations balance? the following chemical equation describes the reaction between hydrogen (h) and oxygen (o) to form water (h2o).
matter cannot be created or destroyed in chemical reactions. this is the principle of conservation of mass. therefore, mass must balance in all chemical equations.
2h₂ + o₂ → 2h₂o
label the image below using every word in the word bank once:
word bank: molecule, oxygen atom, hydrogen atom, hydrogen bond, covalent bond
image of molecular structures with labels to fill

Explanation:

Step1: Identify Atoms

The small circles with H are hydrogen atoms, and with O are oxygen atoms. So label the H - labeled circles as "hydrogen atom" and O - labeled as "oxygen atom".

Step2: Identify Molecules

A group of atoms (like H and O bonded) forming a unit is a molecule. The H₂O - like structures are molecules, so label the grouped H and O as "Molecule".

Step3: Identify Bonds

The solid lines between H and O within a molecule are covalent bonds (intramolecular), and the dashed lines between molecules are hydrogen bonds (intermolecular). So the solid - line bond within a molecule is "covalent bond", and the dashed - line bond between molecules is "hydrogen bond".

Answer:

• The bond with dashed lines (between molecules): hydrogen bond
• The bond with solid lines (within a molecule): covalent bond
• The small H - labeled circles: hydrogen atom
• The small O - labeled circles: oxygen atom
• The grouped H and O (e.g., H₂O - like structure): Molecule