1. Directions: Copy the following examples. Answer using the following terms: Mechanical, Thermal, Chemical, Electrical 1. Hydroelectric dam 2. A horse pulling a cart 3. A thermos of hot coffee 4. The bonds holding atoms together in food

2. Properties of Matter Day 49

3. Reading Passage Matter Please read the passage and complete the questions.

4. Matter Terms  Molecules Chain of atoms together from the same element.  Particle(s) Tiny round objects in matter Molecules Particles

5. Pure Substances Matter that always has the same composition is a pure substance, or simply a substance. Every sample of a given substance has the same properties because a pure substance has a fixed, uniform composition. Examples: Salt Sugar

6. Elements An element is a substance that cannot be broken down in simpler substances. An atom is the smallest particle of an element. An element has a fixed composition because it contains only one type of element.

7. Compounds A compound is a substance that is made from two or more simpler substances and can be broken down into those simpler substances. A compound always contains two or more elements joined in a fixed proportion. For example: Water is a compound

8. Mixtures A mixture is made up of two or more substances The properties of a mixture can vary because the composition of a mixture is not fixed There are two types of mixtures; Heterogeneous Mixtures Homogeneous Mixtures

9. HETEROGENEOUS The parts of this type of mixture are noticeably different from one another An example would be beach sand. The substances of this type of mixture are so evenly distributed that it is difficult to distinguish one substance in the mixture from another. The water in a swimming pool looks the same. HOMOGENEOUS Mixtures

10. Solutions, Suspensions, and Colloids It isn’t always easy to tell a homogeneous mixture from a heterogeneous mixture. Based on the size of its largest particles, a mixture can be classified as a solution, a suspension, or a colloid.

11. Solutions, Suspensions, and Colloids When substances dissolve and form a homogeneous mixture, this mixture that forms is a solution. Suspensions are heterogeneou s mixtures that separates into layers over time. Can use a filter to separate substances. A colloid contains some particles that are intermediate in size between the small particles in a solution and the larger particles in a suspension. Like solutions colloids don’t not separate into layers. You cannot use a filter to separate the substances Solutions Tea or Kool-Aid Suspensions Sand and Water Colloids Fog

12. MatterA:_____ElementB:______MixtureC:______D:_____ Graphic Organizer Matter

13. Physical Property A physical property is any characteristic of a material that can be observed or measured without changing the composition of the substances of the material. Example physical characteristics: – Viscosity – Conductivity – Malleability – Hardness – Melting point – Boiling point – density

14. Physical Changes A physical change occurs when some of the properties of a material change, but the substances in the material remain the same. The change of water from liquid to a gas during boiling is a physical change

15. Examples of Physical Changes ripping a picture balling up paper ANY CHANGES IN A STATE OF MATTER IS A PHYSICAL CHANGE!!!!! painting your fingernails coloring a picture boiling water freezing a popsicle

16. Chemical Properties A chemical property is any ability to produce a change in the composition of matter. Chemical properties can be observed only when the substances in a sample of matter are changing into different substances. Example chemical characteristics Flammability Reactivity Combustibility Ability to rust Ability to tarnish

17. Chemical Changes A chemical change occurs when a substance reacts and forms one or more new substances. Three common types of evidence for a chemical change are; a change in color, the production of gas, and the formation of a precipitate.

18. Examples of Chemical Changes A banana rotting is a chemical change. burning a picture reactivity (baking soda reacts with vinegar to produce CO 2 gas bubbles) pennies and ammonia will react and produce a color change diet coke and Mentos react to produce a LOT of gas bubbles! Cooking Rusting Tarnishing digesting

19. Is a change chemical or physical? When matter undergoes a chemical change, the composition of the matter changes. When matter undergoes a physical change, the composition of the matter remains the same.

20. Graphic Organizer Composition Of Matter Doesn’t change during Physical change MeltingB:_______ Does change during A:_________C:__________rusting Composition of Matter