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2.1 Properties of Matter 2.1 Properties of Matter >>
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Chapter 2Matter and Change
2.1 Properties of Matter
2.2 Mixtures2.3 Elements and Compounds2.4 Chemical Reactions
2.1 Properties of Matter 2.1 Properties of Matter >>
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In this lesson, you will learn how properties can be used to classify and identify matter.
CHEMISTRY & YOUCHEMISTRY & YOU
Why are windows made of glass?
2.1 Properties of Matter 2.1 Properties of Matter >>
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Describing Matter
Why do all samples of a substance have the same properties?
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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What you observe when you look at a particular sample of matter is its properties.
• Is a solid shiny or dull?• Does a liquid flow quickly or slowly?• Is a gas odorless, or does it have a smell?
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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What is Matter?
Describing MatterDescribing Matter
What are Properties?
Matter is any thing that has mass and takes up space. (even air!) DEMO
Matter can be described by properties.
How can matter be described?
Distinguishing qualities or attributes of a sample of matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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The mass of an object is a measure of the amount of matter the object contains.
A Property Example
Describing MatterDescribing Matter
The mass of a basketball is greater than the mass of a golf ball.
2.1 Properties of Matter 2.1 Properties of Matter >>
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The volume of an object is a measure of the space occupied by the object.
• The volume of a basketball is greater than the volume of a golf ball.
Describing MatterDescribing Matter
Another Property Example
2.1 Properties of Matter 2.1 Properties of Matter >>
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For example, leather balls are suitable for indoor play but not outdoor play.
• Leather balls absorb water and dirt more than rubber balls do.
What about what the substance’s “insides”?
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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• Absorbency
• Conductivity
• Malleability
• Color
• Odor
• State of Matter
Describing MatterDescribing Matter
More examples of properties
• Reactivity
• Flammability
• Toxicity
• Oxidizing
• Radioactivity
• Combustibility
2.1 Properties of Matter 2.1 Properties of Matter >>
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• A physical property is a quality or condition of a substance that can be observed or measured without changing the substance’s composition.
• A chemical property is a quality or condition that gives matter the ability to undergo a change that alters its composition
Two different types of properties
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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• Absorbency
• Conductivity
• Malleability
• Color
• Odor
• State of Matter
Describing MatterDescribing Matter
More examples of properties
• Reactivity
• Flammability
• Toxicity
• Oxidizing
• Radioactivity
• Combustibility
Physical properties Chemical properties
2.1 Properties of Matter 2.1 Properties of Matter >>
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Every sample of a given substance has identical properties because every sample has the same composition.
Identifying a Substance
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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Glass is often used to make windows, while copper is often used in electrical wires. What properties of glass make it a desirable material to use for windows?
CHEMISTRY & YOUCHEMISTRY & YOU
2.1 Properties of Matter 2.1 Properties of Matter >>
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Glass is often used to make windows, while copper is often used in electrical wires. What properties of glass make it a desirable material to use for windows?
Glass is transparent, so it can be seen through; hard, so it stays in place within window frames; and heat resistant, so it helps prevent the transfer of heat between outside and inside.
CHEMISTRY & YOUCHEMISTRY & YOU
2.1 Properties of Matter 2.1 Properties of Matter >>
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You want to compile a list of properties of any substance, what could you observe or measure?
List at least 5 different properties and label as Physical or Chemical
2.1 Properties of Matter 2.1 Properties of Matter >>
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States of Matter
What are three states of matter?
States of MatterStates of Matter
Three states of matter are solid, liquid, and gas.
Kinetic Art- Pearson
2.1 Properties of Matter 2.1 Properties of Matter >>
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A substance is in a state in which it takes the shape of its container. What state or states could it be in?
2.1 Properties of Matter 2.1 Properties of Matter >>
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A substance is in a state in which it takes the shape of its container. What state or states could it be in?
The substance could be either a liquid or a gas, as each takes the shape of its container.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Physical properties can help chemists identify substances.
• For example, a colorless substance that was found to boil at 100˚C and melt at 0˚C would likely be water.
• A colorless substance that boiled at 78˚C and melted at –117˚C would definitely not be water. It would likely be ethanol.
Identifying a Substance
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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Physical Properties of Some Substances
Substance State Color Melting point (°C) Boiling point (°C)
Neon Gas Colorless –249 –246
Oxygen Gas Colorless –218 –183
Chlorine Gas Greenish-yellow –101 –34
Ethanol Liquid Colorless –117 78
Mercury Liquid Silvery-white –39 357
Bromine Liquid Reddish-brown –7 59
Water Liquid Colorless 0 100
Sulfur Solid Yellow 115 445
Sodium chloride Solid White 801 1413
Gold Solid Yellow 1064 2856
Copper Solid Reddish-yellow 1084 2562
Interpret DataInterpret Data
This table lists physical properties for some substances.
• The states of the substances are given at room temperature.
2.1 Properties of Matter 2.1 Properties of Matter >>
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In this lesson, you will learn to recognize whether the burning match is a chemical change or physical change.
CHEMISTRY & YOUCHEMISTRY & YOU
What happened to the match?
2.1 Properties of Matter 2.1 Properties of Matter >>
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When a change occurs to a substance, it can be either a Physical Change or a Chemical Change.
What do you think is the difference?
ChangesChanges
2.1 Properties of Matter 2.1 Properties of Matter >>
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The melting point of gallium metal is 30˚C. The figure at left shows how the heat from a person’s hand can melt a sample of gallium.
Physical ChangesPhysical Changes
2.1 Properties of Matter 2.1 Properties of Matter >>
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The shape of the sample changes during melting as the liquid begins to flow, but the composition of the sample does not change.
• Melting is a physical change.
• During a physical change, some properties of a material change, but the composition of the material does not change.
Physical ChangesPhysical Changes
2.1 Properties of Matter 2.1 Properties of Matter >>
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• Words such as boil, freeze, melt, and condense are used to describe physical changes.
• So are words such as break, split, grind, cut, and crush.
Physical ChangesPhysical Changes
2.1 Properties of Matter 2.1 Properties of Matter >>
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Chemical ChangesChemical Changes
Words such as burn, rot, rust, decompose, ferment, explode, and corrode usually signify a chemical change.
• The ability of a substance to undergo a specific chemical change is called a chemical property.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Chemical ChangesChemical Changes
Chemical Changes
What always happens during a chemical change?
2.1 Properties of Matter 2.1 Properties of Matter >>
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Chemical ChangesChemical Changes
Iron is able to combine with oxygen to form rust.• The ability to rust is a chemical property
of iron.
Chemical properties can be used to identify a substance.• Chemical properties can be observed only
when a substance undergoes a chemical change.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Chemical ChangesChemical Changes
During a chemical change, the composition of matter always changes.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Comparing ChangesComparing Changes
Examples of Changes
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Physical Change Chemical Change
2.1 Properties of Matter 2.1 Properties of Matter >>
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Matter that has a uniform and definite composition, with only one set of properties, is called a pure substance.
•Aluminum and copper are examples of pure substances.
Classifying a Substance… (grouping it)
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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Pure substances can either be an Element or a Compound.•Aluminum, Al, and Copper, Cu, are examples of elements.
•Water, H2O, and Salt, NaCl, are
examples of compounds.
Classifying a Substance… (grouping it)
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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Elements can be classified as Metals, Metalloids, or Nonmetals.•Copper is an example of a metal.
•Aluminum is an example of a metalloid
•Sulfur is an example of a nonmetal
Classifying a Substance… (grouping it)
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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Compounds can be classified as Organic or Inorganic.
•Sugar, C12H22O11, is an example of an
organic compound.
•Water, H2O, and Salt, NaCl, are
examples of inorganic compounds.
Classifying a Substance… (grouping it)
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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Inorganic compounds can be classified as Acid, Base, or Salt•H3PO4 is an example of an acid
compound.•NaOH is an example of a base compound. •CuSO4 is an example of salt
compound.
Classifying a Substance… (grouping it)
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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Classification of Matter
MATTERMATTER
PUREPURE
ELEMENTELEMENT
COMPOUNDCOMPOUND
NONMETALNONMETAL
METALLOIDMETALLOID
METALMETAL
ORGANIC
INORGANIC
SALTSALT
BASEBASE
ACIDACID
2.1 Properties of Matter 2.1 Properties of Matter >>
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Matter that contains a physical blend of two or more components, each containing their original properties, is called a mixture
•Trail mix is an example of a mixture.
Classifying a Substance… (grouping it)
Describing MatterDescribing Matter
2.1 Properties of Matter 2.1 Properties of Matter >>
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Describing Matter
Classifying MixturesClassifying Mixtures
How can mixtures be classified?
2.1 Properties of Matter 2.1 Properties of Matter >>
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Describing MatterDescribing Matter
Heterogeneous Mixtures
In chicken noodle soup, the ingredients in the soup are not evenly distributed throughout the mixture.
• There is likely to be different amounts of chicken and noodles in each spoonful.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Describing MatterDescribing Matter
A mixture in which the composition is not uniform throughout is a heterogeneous mixture.
Heterogeneous Mixtures
2.1 Properties of Matter 2.1 Properties of Matter >>
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Describing MatterDescribing Matter
Homogeneous Mixtures
The substances in the olive oil are evenly distributed throughout the mixture.• So, olive oil doesn’t
look like a mixture.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Describing MatterDescribing Matter
Homogeneous Mixtures
Olive oil and vinegar are both homogeneous mixtures.
• A homogeneous mixture is a mixture in which the composition is uniform throughout.
• Another name for a homogeneous mixture is a solution.
2.1 Properties of Matter 2.1 Properties of Matter >>
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At the beach, you realize that both ocean water and sand are mixtures. Which is a homogeneous mixture (or solution)? Which is a heterogeneous mixture?
2.1 Properties of Matter 2.1 Properties of Matter >>
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At the beach, you realize that both ocean water and sand are mixtures. Which is a homogeneous mixture (or solution)? Which is a heterogeneous mixture?
Salt water is a homogeneous mixture, or solution. Sand is a heterogeneous mixture.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Describing MatterDescribing Matter
Based on the distribution of their components, mixtures can be classified as heterogeneous mixtures or homogeneous mixtures.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Classification of Matter
MATTERMATTER
MIXTUREMIXTURE
PUREPURE
ELEMENTELEMENT
COMPOUNDCOMPOUND
HETEROGENEOUSHETEROGENEOUS
HOMOGENEOUSHOMOGENEOUS
NONMETALNONMETAL
METALLOIDMETALLOID
METALMETAL
ORGANIC
INORGANIC
SALTSALT
BASEBASE
ACIDACID
2.1 Properties of Matter 2.1 Properties of Matter >>
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Separating MixturesSeparating Mixtures
Separating Mixtures
How can mixtures be separated?
2.1 Properties of Matter 2.1 Properties of Matter >>
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Separating MixturesSeparating Mixtures
Differences in physical properties can be used to separate mixtures.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Filtration
Separating MixturesSeparating Mixtures
The coffee filter at right can separate ground coffee beans from brewed coffee.
• The liquid brewed coffee passes through the paper filter, but the solid coffee grounds cannot pass through the filter.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Filtration
Separating MixturesSeparating Mixtures
Filter paper used in a laboratory is similar to coffee filters.
• Filter paper is often placed in a funnel.
• Then the mixture is poured into the funnel.
• Solid particles that cannot pass through the filter remain in the funnel.
• The rest of the particles pass through.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Distillation
Separating MixturesSeparating Mixtures
Tap water is a homogeneous mixture of water and substances that are dissolved in the water.• One way to separate water from the other
components in tap water is through a process called distillation.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Distillation
Separating MixturesSeparating Mixtures
During a distillation, a liquid is boiled to produce a vapor that is then condensed into a liquid.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Distillation
Separating MixturesSeparating Mixtures
The figure below shows an apparatus used to perform a small-scale distillation.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Sample Problem 2.1Sample Problem 2.1
Separating a Heterogeneous Mixture
How could a mixture of aluminum nails and iron nails be separated?
2.1 Properties of Matter 2.1 Properties of Matter >>
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In order to identify how to separate aluminum and iron nails, the properties of both aluminum and iron must be known.
Sample Problem 2.1Sample Problem 2.1
Analyze Identify the relevant concepts.1
2.1 Properties of Matter 2.1 Properties of Matter >>
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Sample Problem 2.1Sample Problem 2.1
Solve Apply concepts to this situation.2
List the properties of each substance in the mixture.
Aluminum• metal• gray color• doesn’t dissolve
in water• not attracted to
magnet
Iron• metal• gray color• doesn’t dissolve
in water• attracted to
magnet
2.1 Properties of Matter 2.1 Properties of Matter >>
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Sample Problem 2.1Sample Problem 2.1
Solve Apply concepts to this situation.2
Identify a property that can be used to separate different substances from each other.• The ability to be attracted by a magnet is
a property that iron and aluminum do not share.
• You could use a magnet to remove the iron nails from a mixture of iron and aluminum.
2.1 Properties of Matter 2.1 Properties of Matter >>
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Physical properties, such as melting point and boiling point, are used to describe all matter.
BIG IDEABIG IDEA
Chemistry as the Central Science