Flashcards on Changes in Matter Part 1

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Acid

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A substance with a sour taste and a pH below 7. Acids react with bases to form salts. Example: Lemon juice and vinegar are acids that can dissolve minerals or clean rust.

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Analyze

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To carefully examine something to understand it or find patterns. Example: Scientists analyze data from experiments to see if their hypotheses are correct.

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Atom

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The smallest particle of an element that still has that element’s properties. Example: A gold bar is made up of trillions of gold atoms.

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Base

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A substance with a pH above 7 that feels slippery and can neutralize acids. Example: Baking soda and soap are bases used to clean or reduce odors.

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Chemical Change

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A change that creates a new substance with new properties. Example: Iron rusting or a cake baking are both chemical changes.

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Chemical Property

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A characteristic that describes how a substance reacts to form something new. Example: Flammability and reactivity with acid are chemical properties.

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Compound

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A substance made of two or more elements chemically combined. Example: Water (H₂O) is a compound made of hydrogen and oxygen.

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Conclusion

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A statement that explains what you learned from an experiment. Example: “Adding salt lowered the freezing point of water” is a conclusion based on evidence.

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Condensation

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The process where a gas cools and changes into a liquid. Example: Water drops forming on the outside of a cold drink.

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Evaporation

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When a liquid gains energy and turns into a gas. Example: Puddles drying up after the rain is evaporation.