Properties of matter
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There are two types of changes that matter can undergo: physical changes and chemical changes. Physical changes alter the physical properties of a substance without changing its chemical identity, such as ice melting or a metal being bent. Chemical changes occur when new substances are formed with different chemical properties than the original substances, like a log burning or food being digested. Some signs that a chemical change has taken place include a color change, gas production, energy release or absorption, light or sound production, or formation of a precipitate. Chemical changes form entirely new substances and are generally not reversible.
Properties of matter
- 1. The Properties of Matter Looking at Matter at the Molecular Level
- 2. Describing Matter The characteristics or properties of an object can help you identify the substance. Substances have unique properties and characteristics.
- 3. Properties of Matter There are: Physical Properties Chemical Properties
- 4. Physical Properties Things that describe the object are physical properties. Physical properties can also be observed or measured without changing the identity of the matter.
- 5. Physical properties Boiling point - Viscosity Melting point - Density Volatility - Malleability Color - Electrical conductivity Taste Hardness Odor Ductility
- 6. Chemical Properties Chemical properties describe a substance based on its ability to change into a new substance with different properties. Chemical properties cannot be observed with your senses. Chemical properties aren’t as easy to observe as physical properties.
- 7. Chemical properties Burns in air Explodes Tarnishes Decomposes when heated Reacts with water, metals, etc. Is toxic Decomposes by electricity
- 8. Matter undergoes changes There are 2 types of changes: Physical changes Chemical changes
- 9. Physical Changes A physical change is a change that affects one or more physical properties of a substance. Physical changes do not form new substances! EX: ice melting or sugar dissolving Physical changes are easy to undo.
- 10. Physical Changes Crumpling a piece of paper Pulling copper into a thin wire Cutting wood Tearing a piece of aluminum foil Breaking glass Cloud forming in the sky Freezing water
- 11. Chemical Changes A chemical change occurs when one or more substances are changed into entirely new substances with different properties. You can observe chemical properties only when a chemical change might occur! Examples of chem. changes: baking a cake rusting
- 12. Chemical changes Burning a log of wood Combustion of gasoline Digestion of food Lightning a match Rusting nail Cooking a cake Photosynthesis
- 13. Signs of chemical changes Color change Fizzing or bubbling (gas production) Energy change Production of light, sound, or odor. Formation of a precipitate Chemical changes are not usually reversible!