chapter two properties of matter. matter pure substance elementcompoundmixture homogeneous mixture...
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Chapter Two
Properties of Matter
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Classification of Matter
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Matter• Is anything that has mass and takes up space
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•In its most basic distinction, matter can be classified as either a
pure substance or a mixture.
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Pure Substance• Like the name suggests, a pure substance is
made of one type of material. It cannot be broken down into a simpler form without
losing its identity.
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Elements• Elements are the simplest form of a
pure substance. They are only composed of atoms of that element.
• Gold is only made up of gold atoms.
• Chlorine is only made up of atoms of chlorine.
• Sulfur is only made up of atoms of sulfur.
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Elements
• Prepare for Element Quizzes!!!!!!• You will know them inside and out!!!
• Elements
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• All atoms of an element are identical to each other but completely different from atoms of any other element.
• Each atom of a given element has a unique number of protons in its nucleus. This determines the identity and the properties of that element.
• Every element is identified by a chemical symbol, a 1,2,or 3 letter symbol taken from the element’s name (Latin), country of origin, or the person who discovered it. – There have been over 120 identified elements, 92 of
which are naturally occurring . • Elements cannot be broken down into any
simpler substance.
Properties of Elements
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Daily Assignment
• Explain why both elements and compounds are considered pure substances.
• Each are only made up of only one type of substance.
• Elements are composed of atoms of that element.
• Compounds are composed of molecules of that compound.
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Compound• Are formed from the chemical combination of
two or more elements. • To create a compound, a chemical change ( or
reaction) must take place in which a new substance with a new set of properties is formed.
Sodium + Chlorine Sodium Chloride
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Properties of Compounds• Chemically combined groups of elements are called
molecules, represented by a chemical formula. – The formula tells you the identity of the elements and the number of
atoms of each element in that compound. NaCl H20 NH3 Each molecule of a given compound is identical to every molecule of that
compound, but completely different from molecules of a different compound.
• The properties of the compound are different than the properties of the elements that make it up. – NaCl is table salt. It is formed by the chemical combination of Na, a
silver metal that explodes in water and Cl, a poisonous green gas. – Sucrose (C12H22O11 ) is table sugar. However, Carbon is a black
solid and hydrogen and oxygen are both colorless, odorless gases.
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Compounds• The ratio of different atoms in a
compound is always the same. Hydrogen and oxygen can combine in different ratios to form
different compounds.
• Compounds cannot be broken down into simpler substances that still retain the properties of that compound.
H2O H2O2
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Daily Assignment
Copper, Sulfur ,
and oxygen combine to create
Copper sulfate.
• How do you know that copper sulfate is a compound?
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Mixture• Matter that consists of two or more
substances that are mixed together but not chemically combined is a mixture. Mixtures
are physically combined.
Mixtures “together but separate”
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Mixtures• Each substance that makes up
a mixture retains its chemical / physical properties.
Sulfur = yellow, rotten egg smell
Iron = black, magnetic
Even in a mixture, iron is still magnetic.
Iron in the compound FeS is NOT magnetic.
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Mixtures• The substances that make up a mixture
may be present in any amount, unlike compounds which must combine in
specific ratios.
It doesn’t matter how much koolaid you mix with the water, it is always a koolaid and water mixture.
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Mixtures• Since mixtures are physically combined they
can also be separated based on the physical properties of their components.
• How would you separate these mixtures?
Ocean water Beach sandTrail mix
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Separation of Mixtures
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Mixtures
• Mixtures can be further distinguished as either a homogeneous mixture or a
heterogeneous mixture.
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Homogeneous Mixture
• A.K.A. a solution. “Homo” means the same. A homogeneous mixture appears to have the same properties throughout the entire mixture.
• A solution is formed when substances are dissolved in another substance. The particles that make up a solution are very small. They will never settle to the bottom.
PURE AIR
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Heterogeneous Mixture
• Is a mixture that appears to have “different” properties throughout the mixture. The particles that make up a het. mixture are larger then those that make up a solution.
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What kind of mixtures are these?
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Colloid
• The particles that make a colloid are mixed, but not dissolved. These particles are larger than those in a solution, but they will never
settle to the bottom.
• Due to their large particle size, a colloid often appears cloudy.
Mayonnaise paint milk smog Jello and whipped cream
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Suspension
• Are the least mixed of all the mixtures. These are made of the largest size particles. If you
let a suspension sit long enough, it’s particles will settle to the bottom.
Cookie dough ice cream
Cereal and milk
Muddy pond water
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Tyndall Effect• Is the effect of a laser to pass through a
mixture. • If the laser passes through completely, the
mixture is a solution. • If the laser is trapped (or bounced between
particles) it is a colloid or suspension.
Light passes through the blue solution.
Particles of a colloid scatter the light
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Physical Properties• A physical property is a
characteristic of material that you can observe without changing the identity of the substances that make up the material.
• Examples: color, shape, size, density, melting/freezing/boiling point, texture, magnetism, and viscosity .
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Physical Properties
• Viscosity – the tendency of a liquid to resist flow
• Conductivity – the ability of a substance to carry electrical current
• Malleability – the ability of a substance to bend without breaking
• Hardness – How hard something is• Melting and Boiling Points
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Physical Properties• Density – ratio of a substance’s mass to
its volume• Two ways to separate mixtures– Filtration – using some kind of medium to
remove large particles– Distillation – boiling out the pure substance
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Physical change• A change is the size, shape or state of matter.
• The identity of the materials that makeup the substance is never altered during a
physical change.
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Chemical Property• A chemical property is a characteristic of a
material that you can only observe by changing the identity of the substance.
flammability
Photosensitivity Oxidation (rust)
combustibility
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Chemical Properties• Flammability – the readiness with which a material burns• Reactivity – the likelihood of something reacting with
another chemical
• Chemical Properties
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Chemical Change• A changing of one substance to another is a
chemical change. You cannot return to the original substance after a
chemical change.
Fizzing and bubbling indicate chemical change. Cooking is a
chemical change
Electrolysis: separation of
water
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Chemical Changes• Evidence of a chemical
change– Change in color– Production of a Gas• See Demonstration
– Formation of a Precipitate• See Demonstration
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Chemical Vs. Physical
• In a chemical change, the substance changes. In a physical change, the matter remains the same.