what is matter matter is anything that takes up space (volume) and has mass matter has properties...
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What is Matter Matter is anything that takes up
space (Volume) and has Mass Matter has Properties Hardness, color, texture, shape,
melting or boiling points, Chemical activities (flammability or reacting with other chemicals
More to follow on Properties
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What is Matter made of?
ElementsCompoundsMixtures
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What is Matter made of? Elements-Building blocks of
nature. They cannot be broken down
Elements are found on Periodic Table Atomic-most elements can exist as
individual atoms(smallest particle of any element). Examples: Fe, Au, Ag, Al
Molecular-some elements are Diatomic when found in molecular form in nature. H2, O2, N2, F2, Cl2, Br2, I2
Also Triatomic, Tetratomic, Octatomic
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What is Matter made of? Compounds-Two or more
elements chemically bonded together Smallest particle is a Molecule These can be broken down into
smaller compounds or elemental parts
Examples: H2O(water), Fe2O3(rust) 2 H2O(l) 2 H2(g) + O2(g) 2 Fe2O3(s) 4 FeO(s) + O2(g) 2 FeO(s) 2 Fe(s) + O2(g) 2NaCl(s) 2 Na(s) + Cl2(g) CH4(g) + 2 O2(g) CO2(g) + 2 H2O(g)
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What is Matter made of? Mixtures-These are made of two
or more chemicals that are not chemically bonded together. Examples: Sand, Salt/Pepper, Milk, Blood, Muddy water Homogeneous – similar
throughout(cola) Heterogeneous – differences occur
(concrete) Mixtures can usually be separated
easily by physical means such as filtration, distillation or chromatography
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Filtration:
Separates tiny solid substances that are only suspended in liquids and solutions. Not for dissolved chemicals
Coffee filtersSome water filtersPool filters – sand or
Diatomaceous Earth
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Distillation: SeparatesHomogeneousmixtures using the differences inboiling points.BPH20 = 100˚C
BPNaCl = 808˚C
Water vapor rises first and condenses in the tube.
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Chromatography:Separates colored substances on the basis of differences in solubility in a solvent. Higher solubility travels farther.
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Classification Flowchart
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Physical Properties
Volume, mass, size, color, shape, smell, hardness, density, texture, melting & boiling points, viscosity, temperature…
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Physical Changes Change that alters appearance or
form of material but does not change to different kind of material
Changes of State are ALWAYS Physical Changes
Examples: tearing paper, breaking pencil, crushing a rock, ice melting, gasoline vaporizing
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Chemical Properties What are the chemical activities of
the material Does it react with Oxygen Does it react with Water Does it react with Chlorine Does it react with Fluorine Does it react with …
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Chemical Changes A chemical reaction occurs that
produce NEW substances Old chemicals bonds must be
broken and new ones formed Example: burning fuel, digesting
food, Photosynthesis, rusting iron, plant decay, baking bread
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2 Kinds of Chemical Reactions
Exothermic Releases heat into surroundings Might feel warm or hot to the touch Reactants have higher energy in their bonds Examples:
Mixing acid with bases Burning of a fuel Digestion
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2 Kinds of Chemical Reactions
Endothermic Absorbs heat from the surroundings Could feel cool to the touch Products have more energy than reactants Examples:
Cooking an egg Dissolving Baking Soda Photosynthesis Cooking coffee beans
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Measuring Matter Volume -- How much space
material takes up: V=LxWxH V=Pr2h V=4/3Pr3
Mass -- gram, Kilogram not affected by gravity
Weight -- Pounds, Ounces The effect that gravity has on a mass
Density = Mass/Volume
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Density Mass/Volume Affects the buoyancy
of material. Does it float?
Is NOT affected by size of sample
Is affected by change in temperature
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Temperature
In scientific measurements, the Celsius and Kelvin scales are most often used.
The Celsius scale is based on the properties of water.□ 0C is the freezing
point of water.□ 100C is the
boiling point of water.
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Temperature
The Kelvin is the SI unit of temperature.
There are no negative Kelvin temperatures.
K = C + 273
• The Fahrenheit scale is not used in scientific measurements.
• F = 9/5(C) + 32• C = 5/9(F − 32)
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Accuracy versus Precision Accuracy refers to the
proximity of a measurement to the true value of a quantity.
Precision refers to the proximity of several measurements to each other.