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Chemical Properties

Chemical Properties. Chemical Property something that leads to a change in composition of matter. Flammability – ability to burn when oxygen is present Can be a good and bad property (lighter fluid SHOULD be flammable, Carpet is bad to be flammable) Solids, liquids or gases. Reactivity-

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Chemical Properties

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  1. Chemical Properties • Chemical Property • something that leads to a change in composition of matter

  2. Flammability – • ability to burn when oxygen is present • Can be a good and bad property (lighter fluid SHOULD be flammable, Carpet is bad to be flammable) • Solids, liquids or gases.

  3. Reactivity- • the ability to combine with another substance easily • Oxygen reacts with most substances • Causes rusting of metals, allows fire to burn • Nitrogen is not very reactive and is often added to reduce the other element side effects

  4. Physical and Chemical Changes How to tell the difference

  5. Physical Change- • physical properties change, but the substance is the same • Change in what you see but does not produce a new substance • Painting a house, cutting hair, ironing shirt, melting water/boiling water

  6. Some physical changes are reversible, some are not • Reversible—freezing & melting water, braiding hair • Non-reversible—slicing a tomato, peeling an orange

  7. It’s a physical change if • It changes shape or size • It dissolves.

  8. It’s a physical change if... • It changes phase (freezes, boils, evaporates, condenses)

  9. Chemical Change • Chemical Change- • when substances react to form one or more NEW substances • Look for permanent change in color, gas bubbles, leftover solid • Non-Reversible

  10. It’s a chemical change if…. • It burns • Temperature changes without heating/cooling

  11. It’s a chemical change if... • It bubbles (makes a gas)

  12. It’s a chemical change if... • It changes color permanently • It forms a leftover solid

  13. Examples: • Silver ring that turns green • Rusting cars • Copper pennies turning green • Baking powder in cake – cake rises • Vinegar and baking soda • Adding vinegar to milk • Lighting a match • Explosion or burning of wood

  14. What kind of change is it if someone... • Tears up paper? • Physical change • Mixes salt and water? • Physical change

  15. What kind of change is it if someone... • Burns paper? • Chemical change • Evaporates salt water? • Physical change

  16. What kind of change is it if someone... • Mixes vinegar and baking soda? • Chemical change

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