DESCRIBING MATTER. Anything that has mass and takes up space Substance - single kind of matter that...
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Transcript of DESCRIBING MATTER. Anything that has mass and takes up space Substance - single kind of matter that...
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DESCRIBING MATTER
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Anything that has mass and takes up space
Substance - single kind of matter that has a specific
make-up and specific properties Example: Salt or sugar
Non-Example: Muffin batter (the ingredients can vary)
MATTER
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Can be observed without changing into another substance
Examples: Freezing point, melting point, density, texture, color, flexibility, solubility in
water
PHYSICAL PROPERTIES OF MATTER
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Ability to change into a different substance
Examples: flammability, rusting, tarnishing, rising of bread in baking process
CHEMICAL PROPERTIES OF MATTER
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Pure substances that cannot be broken down into any other substance
Simplest substances - identified by its specific
physical and chemical properties
Examples: Carbon, Oxygen, Gold, Silver, Aluminum
ELEMENTS
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Basic particle that makes up all elements
Having different atoms gives elements their unique properties
Atoms have parts! The nucleus is made up of positively charged
protons and neutrally charged neutrons.The nucleus is surrounded by a cloud of
negatively charged electrons.
ATOMS
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Pencil “lead” is made of mostly graphite, a form of
carbon.
Two ways to model atoms used in this presentation
are shown here for carbon.
MODELING AN ATOM
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Atoms combine by chemical bonds (a force of attraction between the electrons of 2 or
more atoms).
Often form molecules- groups of 2 or more atoms held together by chemical bonds
Examples: H2O, O2, CO2
CHEMICAL BONDS
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MODELING MOLECULES
How many atoms are in each of these molecules?
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Pure substance made up of 2 or more elements chemically combined in a set ratio
Represented by a chemical formula which shows the elements in the compound and the ratio of atoms
When elements combine to form compounds, they have unique properties from those of the uncombined elements
-Example: Hydrogen alone is a very combustible gas, Oxygen alone is a major supporter of combustibility, but when
combined in the set 2:1 ratio H2O, they put out fires!
COMPOUNDS
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A ratio compares two numbers. It tells you how much you have of one item compared to how much you have of
another. For example, a cookie recipe calls for 2 cups of flour to every 1 cup of sugar. You can write the ratio of
flour to sugar as 2 to 1, or 2:1.
The chemical formula for rust, a compound made from the elements iron (Fe) and oxygen (O), may be written as
Fe2O3. In this compound, the ratio of iron atoms to oxygen atoms is 2:3. This compound is different from FeO, a compound in which the ratio of iron atoms to oxygen
atoms is 1:1.
RATIOS
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Practice Problem
What is the ratio of nitrogen atoms (N) to oxygen atoms (O) in a compound with the formula N2O5?
Is it the same as the compound NO2? Explain.
N2O5 contains two nitrogen atoms for every five oxygen atoms. Both N2O5 and NO2 are made up of only nitrogen atoms and oxygen atoms. However,
the two compounds are different because NO2 contains one nitrogen atom for every two oxygen
atoms.
RATIOS
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Made up of 2 or more substances that are not chemically combined
Differ from compounds because they do not have to have a set ratio, and each substance
in mixture keeps its individual propertiesExamples: Air, Soil, Salt water
MIXTURES
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Hetero = differentCan see different parts of mixture
Examples: Soil, Salad
HETEROGENEOUS MIXTURES
Who can think of other examples?
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Homo = sameCan’t see different parts of mixture,
evenly mixedExamples: Sugar/water solution, Air
HOMOGENEOUS MIXTURES
Who can think of other examples?
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Compounds are hard to separate
Mixtures are easy to separate since each component keeps its own properties
Look at figure 10 on page 66, it shows different ways to separate a mixture including using a magnet, filtering,
distilling, and evaporating
SEPARATING MIXTURES
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LET’S REVIEW!!
What are some examples of chemical properties of matter?
Rusting, flammability, bread
baking
What are some examples of physical properties of matter?
Density, melting, freezing, color,
flexibility, hardness
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LET’S REVIEW!!
What 2 things does a chemical formula
show?The elements
present and the ratio of atoms
Give an example of an element.
Carbon, Oxygen, Nitrogen, Gold,
Silver, etc.