1 / 13

Understanding Matter: Physical and Chemical Properties

Learn about the characteristics of matter, distinguishing between physical and chemical properties, and how to identify physical and chemical changes. Explore examples and concepts such as energy in chemical reactions.

ablecha
Download Presentation

Understanding Matter: Physical and Chemical Properties

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 1Section 1.2 Properties and Changes of Matter

  2. Physical and Chemical Properties Properties (characteristics) of matter can be described as either: • Physical • Chemical

  3. What is a Physical Property? • These are properties that don’t involve changes in composition. • Qualitative examples: • The solution is blue • The tree is tall • The butter is soft • The liquid freezes at a low temperature • Quantitative examples: • Ice melts at 0°C • Iron has a density of 7.86g/mL

  4. Physical Properties • State of matter (change in state) • Conductivity • Magnetic • Color • Melting point, boiling point • Density • Malleability

  5. What is a Chemical Property? • These are properties that can be observed when there IS a change in the composition of the substance. (Change in composition) • Examples: • Oxidizer • Reactive • Flammable

  6. Physical Change • Change of matter where its identity does not change (Doesn’t change what it is) • Cutting of paper • Sharpening of pencil • Ice melting into water

  7. Chemical Change • Change of matter where its identity is changed (Changes what it is). Usually related to a chemical reaction. • Decomposition • Explode • Rot • Rust (oxidation) • Color change • Tarnish • Ferment

  8. How do I know if it is a Chemical or Physical Change? • Ask the question – Do you end up with the same stuff you started with? • Yes, physical change • No, chemical change

  9. Chemical Change and Atoms • Law of conservation of mass (matter) • - In a chemical change, matter is neither created nor destroyed. • Example: CH4 + 2O2 CO2 + 2H2O No atoms are gained or lost…

  10. Chemical Change and Energy • Energy is the capacity to do work. Energy is either absorbed or released in a chemical change. • Chemical reactions that give off heat energy are called exothermic reactions • Chemical reaction that absorb heat energy are called endothermic reactions

  11. Endothermic Examples • Absorbs heat and cools surroundings • Melting (ice cubes) • Cooking an egg • Evaporation of sweat • Photosynthesis • Baking soda when baking

  12. Exothermic Examples • Gives off heat and increase temp of surroundings • Burning wood • Digestion of food • Freezing • Cellular Respiration • Metabolism • Combustion of ammonium nitrate

  13. Exothermic and Endothermic • http://www.kentchemistry.com/links/Matter/EndoExo.htm

More Related