Chemical and Physical Changes Flashcards
Grade 7 · Science · Flashcards
Vocabulary for identifying and understanding physical and chemical changes in matter.
Flashcards
- Physical change
- A change that alters the form, size, shape, or state of matter without forming a new substance.
- Chemical change
- A change that produces one or more new substances with different chemical properties.
- Reactants
- The original substances that enter a chemical reaction.
- Products
- The new substances formed as a result of a chemical reaction.
- Signs of a chemical change
- Color change, gas production, heat or light release, new odor, or precipitate formation.
- Precipitate
- A solid that forms from a solution when a chemical reaction occurs.
- Law of Conservation of Mass
- The total mass of reactants equals the total mass of products in a chemical reaction.
- Reversible change
- A change that can be undone; most physical changes are reversible (e.g., melting ice).
- Irreversible change
- A change that cannot easily be undone; most chemical changes are irreversible (e.g., burning).
- Combustion
- A chemical reaction in which a substance reacts rapidly with oxygen, releasing heat and light (burning).
- Oxidation
- A chemical reaction where a substance gains oxygen; rusting is a slow oxidation reaction.
- Chemical reaction
- A process in which one or more substances are changed into different substances through breaking and forming chemical bonds.
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