Matter and Measurement. Classification HeterogeneousMixtureCompound MatterElement Pure Substance...
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Transcript of Matter and Measurement. Classification HeterogeneousMixtureCompound MatterElement Pure Substance...
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Matter and Measurement
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Classification
Heterogeneous Mixture CompoundMatter ElementPure Substance Homogeneous
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Chemistry
Study of composition, structure, and properties of matter and of changes that occur in matter
What is matter? Anything that has _______ and takes up space
What is mass? Measure of the amount of _______ in a sample
This is different than weight. Weight includes mass and the force of gravity on that mass
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Matter
Matter is composed of Pure substances Mixtures
Pure substanceAll the particles are the same and they cannot be broken down by _________ processes
Mixture Has more than one ____________ in it
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AtomsAtoms
An atom is the smallest unit An atom is the smallest unit of an ________.of an ________.
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ElementsElements
An element is composed of An element is composed of atoms that all have the same atoms that all have the same number of ______. number of ______.
Elements are pure substances.Elements are pure substances.
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ElementsElements
In pictures we represent In pictures we represent different elements as different different elements as different shapes or sizes or colors. shapes or sizes or colors.
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Chemical symbols
Elements have been given symbols to represent them in shorthand.
Some symbols are shortened forms of the element name: Carbon – C Oxygen – O Neon – Ne
Some symbols come from names in languages other than English. Sodium – Na Copper – Cu
Symbols are always 1-2 letters, capital first, then small
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Elements
Listed in the periodic table
Must know1-31, 33-38, 40,
42, 46-48, 50-51, 53-57, 74, 78-80, 82-83, 86-87, 89, 92, and 94
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CompoundsCompounds
A compound is composed of several A compound is composed of several types of elements bonded together. types of elements bonded together.
Compounds are pure substances.Compounds are pure substances.
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MoleculesMolecules
A molecule is the smallest A molecule is the smallest unit of a _________.unit of a _________.
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Composition
The composition of a sample tells what elements are in the sample The simplest ratio of those elements with respect
to each other.
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Chemical formulas
A chemical formula tells which elements are in a compound, and the simplest ratios of the elements.
A subscript is used after an element if there is more than one atom of that type in a molecule. H2O = 2 hydrogen atoms with 1 oxygen atom.
Al2O3 = 2 aluminum atoms with 3 oxygen atoms.
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Mixtures
Substance containing 2 or more pure substances mixed together
Classified as heterogeneous or homogeneous
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Heterogeneous Mixture
Contains phasesInterface- area between two phases
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Homogeneous Mixture
Same appearance throughout Classified as ___________
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Suspensions, Colloids, and Solutions
Heterogeneous mixture Suspension
_______ particle size Particles suspended for a time but will settle out
Colloid _______ particle size Particles stay suspended
Homogeneous mixture Solution
_______ particles size Particles stay suspended
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Solution
_______- thing being dissolved_______- thing doing dissolving
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Physical vs Chemical
Properties- description of matter Physical- characteristic of matter displayed without a
chemical change Odor, color, density, etc…
Chemical-characteristic of matter displayed during a chemical change Reactivity
Changes- description of a change to matter Physical- change in matter that does not affect its
composition Phase change, dissolving, cutting or tearing, etc…..
Chemical- change in matter that does affect its composition Chemical rxn
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Property Types
Extensive Property that is dependent on the amount of matter
present in a sample For example: _______________________
Intensive Property that is not dependent on the amount of
matter present in a sample For example: ________________________
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Measuring Matter
Two Methods Qualitative- gives a ________________
For example: Sodium chloride is a white, crystalline structure.
Quantitative- gives a _______________ For example: Mass = 13.5 g
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Measurement Tools
Length ______________
Mass ___________
Time _____________
Temperature ______________
Volume ____________________
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Precision and Accuracy
Precision deals with how consistent a measurement is
Accuracy deals with correct a measurement is
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Significant Figures
Rules apply only to _______________ Degree of uncertainty
Do not apply to Counted objects
For example- 6 sides in a hexagon or 20 books
Defined fractions and values For example- radius is
half of a diameter of a circle or 1000m is 1km
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Determining Number of Sig Figs
All _________ digits are significantZeros
Significant if Caught between two significant figures (107) Found at the end of a number to the right of the decimal
point (2.00) Not significant if
Found to right of non-zero digits in a number without a decimal point (50)
Found to the left of the decimal point in a number less than 1 (0.5)
Found to the right of the decimal point in front of the non-zero digits (0.005)
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Sig Figs in Calculations
Addition and Subtraction Answer should have the same number of places after
the decimal as the number with the least number of places after the decimal that is used in the problem
It is best to round after completing the calculation
Multiplication and Division Answer should have the same number of sig figs as
the number with the least number of sig figs used in the problem
It is best to round after completing the calculation
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Scientific Notation
Method of expressing very large or small numbers
Steps1. Decimal is placed in the number so that that number is
greater than or equal to 1 but less than 10 (for example: 26653 becomes 2.6653)
2. Notation is added to reflect the number of places that the decimal moved and the direction that it moved in If decimal is moved 4 places to the left, a “x 104” will be
added to the number If decimal is moved 4 places to the right, a “x 10-4” will
be added to the number
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SI Units
Modern version of metric systemSI Base Units
Length- __________ Mass- ___________ Time- ___________ Temperature- _________
although we will often use Celsius (◦C) K = °C + 273
Derived Unit Combine multiple base units
For Example: _____________
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Metric System Prefixes
Tera (T) 1012
Giga (G) 109
Mega (M) 106
Kilo (k) 103
Hecto (h) 102
Deca (da or dk) 101
Deci (d) 10-1
Centi (c) 10-2
Milli (m) 10-3
Micro (µ) 10-6
Nano (n) 10-9
Pico (p) 10-12
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Factor Labeling
Method used to convert numbers from one unit to another
Multiply (and divide) using conversion factors Factors need to equal 1 when divided
2.54 cm––––––– = 1 1 in.
1 in.––––––– = 1 2.54 cm