Classification Of Matter Final Upload

Classification of Matter

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

Matter Pure Substances Mixtures Let’s breakdown…

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)

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

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

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

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

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)

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

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Classification Of Matter Final Upload

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