chapter 2 “matter and change” lancaster high school chemistry a
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Chapter 2
“Matter and Change”
Lancaster High SchoolChemistry A
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Matter_______ is anything that: a) has ______, and b) takes up _______
Mass = a measure of the amount of “_____” (or material) the object contains (don’t confuse this with weight, a measure of gravity)
Volume = a measure of the __________________by the object
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Describing Matter Properties used to describe matter
can be classified as:1) ___________ – depends on the
amount of matter in the sample- Mass, volume, calories are
examples
2) ____________ – depends on the type of matter, not the amount present
- Hardness, Density, Boiling Point
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Properties are…Words that describe matter
(adjectives)__________________ - a property that
can be observed and measured without changing the material’s composition.
Examples- color, hardness, m.p., b.p.___________________ - a property that
can only be observed by changing the composition of the material.
Examples- _________________________________ _________________________________, etc.
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States of matter1) ________- matter that can not flow (definite
shape) and has definite volume.2) _________- definite volume but takes the shape
of its container (flows).3) __________- a substance without definite volume
or shape and can flow. Vapor- a substance that is currently a gas, but
normally is a liquid or solid at room temperature. (Which is correct: “water gas”, or “water vapor”?)
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States of MatterStates of Matter
Solid
Liquid
Gas
Definite Volume?
Definite Shape?
Result of a TemperatureIncrease?
Will it Compress?
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Physical vs. Chemical Change_________________will change the visible
appearance, without changing the composition of the material.Boil, melt, cut, bend, split, crackIs boiled water still water?
Can be reversible, or irreversible___________________- a change where a
new form of matter is formed.Rust, burn, decompose, ferment
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___________ are a physical blend of at least two substances; have variable composition. They can be either:
1) _________________ – the mixture is not uniform in composition
• Chocolate chip cookie, gravel, soil.
2) __________________ - same composition throughout; called “solutions”
• Kool-aid, air, salt water Every part keeps it’s own
properties.
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Substances
Substances are either:a) __________, orb) ____________
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Substances: element or compound____________- simplest kind of matter
cannot be broken down any simpler and still have properties of that element!
all one kind of atom._____________ are substances that can
be broken down only by chemical methodswhen broken down, the pieces have
completely different properties than the original compound.
made of ___________atoms, chemically combined (not just a physical blend!)
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Compound vs. MixtureCompound Mixture
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Elements vs. Compounds_____________ can be broken down into simpler substances by chemical means, but __________ cannot.
A “chemical change” is a change that produces matter with a ________________________than the original matter.
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Classification of Matter
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Chemical ChangesThe ability of a substance to undergo
a specific chemical change is called a _________________.• iron plus oxygen forms rust, so the
ability to rust is a chemical property of iron
During a chemical change (also called chemical reaction), the composition of matter always changes.
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Chemical Reactions are…When one or more substances are
changed into new substances.________________- the stuff you start
with_________________- what you makeThe products will have NEW
PROPERTIES different from the reactants you started with
Arrow points from the reactants to the new products
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Recognizing Chemical Changes1) _________ is absorbed or released
(temperature changes hotter or colder)2) __________ changes3) ____________production (bubbling,
fizzing, or odor change; smoke)4) formation of a _______________ - a solid
that separates from solution (won’t dissolve)
5) ______________________- not easily reversed
But, there are examples of these that are not chemical – boiling water bubbles, etc.