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Focus Activity: Look at the picture below. List 4 observations and make 2 inferences.

Focus Activity: Look at the picture below. List 4 observations and make 2 inferences. Homework: Read section 2.3 and answer questions on page 55- left side of your notebook!!! Dress Appropriately for the Lab on Wednesday!.

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Focus Activity: Look at the picture below. List 4 observations and make 2 inferences.

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  1. Focus Activity: Look at the picture below. List 4 observations and make 2 inferences. Homework: Read section 2.3 and answer questions on page 55- left side of your notebook!!! Dress Appropriately for the Lab on Wednesday!

  2. Physical Properties of Matter: a characteristic of a substance that can be observed without changing it into another substance Examples: • Physical State • Color • Texture • Hardness • Freezing Point • Boiling Point • Malleability (Flexibility)

  3. Chemical Properties of Matter:a substance’s ability to change into a different substance Examples: • Flammability • Ability to react with other substances • Oxidation (e.g. rust) • pH Level

  4. Changes In Matter Leaves

  5. Physical Changes • A physical change is any change that alters the form or appearance of matter but does not change the substance. • The substance is the same before AND after the physical change.

  6. Physical Change Examples: • Changes of state (melting, evaporating, etc.) • Changes in shape or form (dissolving, bending, crushing, breaking, chopping) • Forming a mixture • http://www.youtube.com/watch?v=BfmxnV32v6I

  7. Is this matter changing into something new? How is it changing?

  8. chemical ChangeProduces one or more new substances through a chemical reaction. Creates a new substance with properties that are different from the original substance properties.

  9. chemical Change Examples: • Combustion (burning) • Oxidation (rusting) • Any chemical reaction • Cooking food • http://www.youtube.com/watch?v=FZq91OnJJW8&feature=related

  10. CHEMICAL CHANGE

  11. Evidence of Chemical Changes If there is a chemical change you might see…. • Bubbles • Substance may turn cloudy • Temperature changes • Color changes • Change in smell or taste

  12. Law of Conservation of Mass (Matter) Matter is neither created nor destroyed during any physical or chemical change. • The total amount of matter in a chemical reaction always remains the same.

  13. Molecules can help explain the law of conservation of matter. For every molecule of methane that burns, two molecules of oxygen are used. The atoms are rearranged in the reaction, but they do not disappear.

  14. Thermal Energy • Energy – the ability to do work or cause change. • Every physical and chemical change includes a change in energy. • Slicing bread, folding paper, cutting toenails, boiling water, all requires energy!

  15. Thermal Energy • Temperature is a measure of the average energy of the particles matter. • Thermal energy or heat is the total energy of all the particles in an object.

  16. Thermal Energy and Changes in Matter Endothermic Change– • Achange in which energy is absorbed (taken in). • Heat is absorbed by a substance. Examples: • snowman melting • water evaporating

  17. Thermal Energy and Changes in Matter Exothermic Change – • A change in which energy is released • Heat is released by a substance. Examples: • water freezing or condensing • burning paper or wood • hand warmers (for winter)

  18. For your musical enjoyment… http://www.youtube.com/watch?v=5yjEDihEuZI&feature=related

  19. Gummy Bears…. • With your partner get a cup and 1 gummy bear. • Write your names on the cup. • Fill the cup about half way with water. • Put the gummy bear in. • We will check it tomorrow. • On the LEFT side, make a prediction about what you think will happen to your gummy bear. http://www.youtube.com/watch?v=5yjEDihEuZI&feature=related

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