warm up # 1 you have iron, and it rusts. what is happening to the iron? is it still the same...
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Warm Up # 1You have iron, and it rusts. What is happening to
the iron? Is it still the same substance? Why or why not?
When something goes from a solid to a gas, what is happening to the molecules of the substance? Does the substance stay the same? Why or why not?
Something like water, H2O, is said to be a compound (as opposed to an element). What is a compound, and how do you know this?
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Chapter 2.1-2.3Commonly Used Chemistry Terms
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What is Matter? [And Why Does it Matter?]
Matter – Anything with a mass, and occupies volume
[Volume = Space – measured in liters, milliliters, etc]
Mass = grams, kilograms, etc
Three Main Forms: Solid, Liquid, Gas
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Common Terms Part 1Substance – made up
of the SAME matter uniformly (pure)Meat patty = substanceLettuce = substance
Mixture of Substances – made up of different matter – can be physically separatedHamburger (whole)
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Common Terms Part 2
Two types of substances:
Element – simplest form of matterHydrogen, oxygen, iron…
anything on Periodic TableCan NOT be broken down
further
Compound – 2+ elements CHEMICALLY combinedH2O = water compound
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Quick Quiz #1You have a piece of aluminum foil that you wrap your
sandwich with. Has the aluminum foil gone through a physical or chemical change? How do you know?
You are BBQ-ing some steak, which requires you to burn charcoal. Is the charcoal going through a physical or chemical change? How do you know?
What qualifies something to be considered a substance, rather than a mixture? Give an example of each.
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9/23 - Physical vs. Chemical What does this mean?Explaining the Worksheet
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A Physical PropertyObserved with 5 senses
(taste, smell, touch, sight, hearing)
Substance NOT destroyed (permanently)
Luster – shininess
Hardness – how breakable the substance is
Malleability – how easily you can manipulate something (bending, cutting, etc)
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Chemical Property – when something REACTS with something else
NEW substance formed
Examples:Rusting (iron becomes
iron oxide)
Stomach acid breaking down food into chyme
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Physical Change – change in size, shape or state ONLYStates = solid, liquid, gas
No new substance forms
Ex. Melting, boiling, freezing, cutting, grinding, etc.
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Chemical Change – DOES alter chemical composition
New substance forms
Ex. Heating, electricity, chemical reaction, acids/bases
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What about cooking an egg?
What about grass growing?
What about eating that cooked egg?
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What about Dissolving?Dissolving – when a
substance breaks down
Solute – the thing being dissolved
Solvent – thing doing the dissolving
Salt water…a physical changeYou can separate the
salt from the water