Classification Of Matter Final Upload
- 2. Take out your powerpoint (HW due today) so I can come around and check it On your own (you will get the chance to discuss with a partner LATER), decide if the following are elements, compounds or mixtures The air you breathe Salad dressing Milk Gold necklace Sugar Kool-aid Concrete
- 3. Matter Pure Substances Mixtures Let’s breakdown…
- 4. Matter Pure Substances Mixtures Elements 1 type of atom Compounds 2 or more types of atoms bonded Homogeneous Mixture Heterogeneous Mixture 1 phase 2 or more phases (Solution)
- 5. Matter Pure Substances Mixtures Elements 1 type of atom Compounds 2 or more types of atoms bonded Homogeneous Mixture Heterogeneous Mixture 1 phase 2 or more phases (Solution) Remember: Bonded together Just mixed up Mixed chunks you can see (not uniform) Mixed up completely (uniform) in whole # ratios – cannot be broken down using physical means! uniform and definite composition physical blend of two or more components
- 6. So which one are they? Element? Compound? Or Mixture (homogeneous or heterogeneous? The air you breathe Salad dressing Milk Gold necklace Sugar Kool-aid Concrete
- 7. Matter Pure Substances Mixtures Elements 1 type of atom Compounds 2 or more types of atoms bonded Homogeneous Mixture Heterogeneous Mixture 1 phase 2 or more phases (Solution) uniform and definite composition physical blend of two or more components
- 8. Properties of Matter Chemical Property – relates to substance’s ability to undergo change that transforms it into a different substance ( change in matter ) Physical Property – characteristic that can be observed without changing the identity of the substance ( no change in matter ) Extensive – depends on the AMOUNT of a substance present (ex. Length, mass, volume, solubility) Intensive – does not depend on the amount of a substance present but on the TYPE of matter (ex. Density, malleability, conductivity, color, melting point, boiling point) Ex: Burn, rust, explode
- 9. Physical Change vs. Chemical Change Physical Change does not change chemical character/composition of the substance ex. Pounding…tearing into pieces…pulling…melting a substance…heating…boiling a substance Chemical Change produces a substance with new chemical properties Indications of a Chemical Change: 1. Change in energy Endothermic – energy is absorbed (feels cold) Exothermic – energy is released (feels hot) 2. Production of gas 3. Change in color 4. Formation of a precipitate (solid)
- 10. Follow-up questions When separating iron from the mixture, what physical property did you make use of? When separating salt from the mixture, what physical property did you make use of? When did you observe a heterogeneous mixture? When did you observe a homogeneous mixture? Complete question #76 (pg60) in your book