Modeling Chemical Reactions

Front

Chemical Reaction Noun

---

[kem-i-kuhl ree-ak-shun]

Back

Chemical Reaction

---

A process that transforms one set of chemical substances into another by rearranging the atoms of the reactants.

---

Example: Shows how hydrogen and oxygen molecules rearrange to form water during a chemical reaction.

Front

Reactant Noun

---

[ree-ak-tant]

Back

Reactant

---

A substance present at the start of a chemical reaction that is consumed during the process to form products.

---

Example: The image shows hydrogen and oxygen as reactants forming water, demonstrating reactants in a chemical reaction.

Front

Product Noun

---

[prod-ukt]

Back

Product

---

A substance that is formed as the result of a chemical reaction and is written on the right side of an equation.

---

Example: The image shows how methane and oxygen react to form carbon dioxide and water, highlighting the products of the reaction.

Front

Chemical Equation Noun

---

[kem-i-kuhl ee-kway-zhun]

Back

Chemical Equation

---

A symbolic representation of a chemical reaction using formulas and symbols instead of words to show reactants and products.

---

Example: The image shows how hydrogen and oxygen react to form water, using symbols and molecule diagrams.

Front

Chemical Formula Noun

---

[kem-i-kuhl for-myoo-luh]

Back

Chemical Formula

---

A representation of a molecule that uses element symbols and subscripts to show the number of atoms of each element.

---

Example: The image shows glucose's chemical formula, C6H12O6, with colored spheres for atoms.

Front

Subscript Noun

---

[sub-skript]

Back

Subscript

---

A number written below and to the right of a chemical symbol that shows the number of atoms in a molecule.

---

Example: The subscript '2' in H₂O shows there are two hydrogen atoms in a water molecule.

Front

Coefficient Noun

---

[koh-uh-fish-uhnt]

Back

Coefficient

---

A number placed in front of a chemical formula in an equation to indicate the number of molecules involved.

---

Example: The image shows a chemical reaction with coefficients indicating the number of molecules involved.

Front

Law of Conservation of Mass Noun

---

[law uv kon-ser-vay-shun uv mas]

Back

Law of Conservation of Mass

---

The principle that matter is not created or destroyed in a chemical reaction, so reactant mass equals product mass.

---

Example: The image shows how hydrogen and oxygen molecules rearrange to form water, illustrating that mass is conserved.

Front

Mass Noun

---

[mas]

Back

Mass

---

The measure of the amount of matter contained within a physical body or object, independent of its size or volume.

---

Example: A balance scale shows a feather and a rock, illustrating mass by comparing the amount of matter.

Front

Open System Noun

---

[oh-pen sis-tuhm]

Back

Open System

---

A system that can freely exchange both energy and matter with its surroundings, allowing substances to enter or escape.

---

Example: Arrows show matter and energy moving in and out of the system, illustrating an open system.