MS-PS1-5: Mass Conservation in Chemical Reactions

Front

Chemical Reaction Noun

---

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

Back

Chemical Reaction

---

A process where starting substances, called reactants, rearrange their atoms to form new substances, which are called products.

---

Example: Methane and oxygen react to form carbon dioxide and water, showing atom rearrangement.

Front

Reactant Noun

---

[ree-ak-tuhnt]

Back

Reactant

---

A starting substance in a chemical reaction that is consumed as it changes into one or more new products.

---

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

Front

Product Noun

---

[prod-uhkt]

Back

Product

---

A new substance that is formed during a chemical reaction from the rearrangement of atoms in the original reactants.

---

Example: The image shows how methane and oxygen react to form carbon dioxide and water, illustrating the concept of products in a chemical reaction.

Front

Atom Noun

---

[at-uhm]

Back

Atom

---

The smallest particle of an element that retains the properties of that element and is rearranged during chemical reactions.

---

Example: This diagram shows an atom's structure with protons, neutrons, and electrons, helping students understand atomic composition.

Front

Element Noun

---

[el-uh-muhnt]

Back

Element

---

A pure substance consisting of only one type of atom, which cannot be broken down by chemical means.

---

Example: Gold bars represent an element, as they consist of only one type of atom.

Front

Compound Noun

---

[kom-pound]

Back

Compound

---

A substance formed from two or more different elements that are chemically bonded together in a fixed ratio.

---

Example: The image shows water as a compound made of hydrogen and oxygen atoms bonded together.

Front

Law of Conservation of Matter Noun

---

[law uv kon-ser-vey-shuhn uv mat-er]

Back

Law of Conservation of Matter

---

The scientific principle stating that matter is not created or destroyed during a chemical reaction, only rearranged.

---

Example: The mass of substances before and after a chemical reaction is the same, showing matter is not created or destroyed.

Front

Chemical Equation Noun

---

[kem-i-kuhl ee-kwey-zhuhn]

Back

Chemical Equation

---

A symbolic representation of a chemical reaction using formulas to show the reactants, products, and their relative amounts.

---

Example: This image shows a chemical equation where reactants (methane, oxygen) become products (carbon dioxide, water). The balanced scale proves mass is conserved in the reaction.

Front

Chemical Formula Noun

---

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

Back

Chemical Formula

---

A shorthand notation using element symbols and numbers to represent the composition of a substance's smallest unit.

---

Example: The image shows H2O, with two hydrogen atoms and one oxygen atom, representing a water molecule.

Front

Precipitate Noun

---

[pri-sip-i-teyt]

Back

Precipitate

---

A solid substance that forms from a solution during a chemical reaction and does not dissolve in the liquid.

---

Example: A solution forms a solid precipitate during a chemical reaction.

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