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Chemistry - chp 2 Matter and Change
Transcript of Chemistry - chp 2 Matter and Change
extensive properties depend on the amount of matter
- mass -
- volume -
intensive properties depend on the type of matter
- boiling point
Physical Properties of Matter
the condition observed/measured
Ex hardness, color, conductivity,
Physical States of Matter
Matter and Change
not the materials
Ex. boil, freeze, melt,
definite shape and volume
tightly packed particles
expand slightly when heated
close contact of particles
particles are far apart
a measure of the amount of matter that an object contains
a measure of the space occupied by a sample of matter
heterogeneous mixture - composition is not uniform throughout
homogeneous mixture - composition is uniform throughout
Also called Solution - solutes dissolved in solvent
phase = any part of a sample with uniform
composition and properties
2.3 Distinguishing Elements & Compounds
element - simplest form of matter
- has a unique set of properties
- can not be broken down
compound - contains 2 or more elements
chemically combined (fixed proportion)
- can be broken down
by chemical means
properties are different from component elements
chemical change -
produces matter with a different composition
than the original matter.
Distinguishing Substances and Mixtures
substance - composition of a material is fixed
mixture - composition of a material may vary
Symbols and Formulas
symbols to represent elements
- 2nd letter always small
chemical formulas to represent comounds.
- Subscripts indicate relative
proportions of the elements
2.4 chemical reaction
reactant - substance present at the start of the reaction
product - substance produced in the reaction
Recognizing Chemical Changes
transfer of energy,
change in color,
production of a gas
formation of a precipitate -
Conservation of Mass
in a chemical reaction, the mass of the products is always equal to the mass of the reactants
Mass is neither created nor destroyed.
Figure 2.15 When the liquids in photograph (a) are mixed, they react. None of the products are gases.
How do you know that a reaction took place and that mass was conserved during the reaction?
Review PPT on
Complete Chem Reactions - page 56
Chemistry Activity -
Classifying Matter pg 38
On-line Textbooks - chp 2 Concepts in Actions - - Watch cooking Up Chemical and Physical Change - then complete (MOODLE) HW assessment on Physical vs Chemical Change
Chemical Property - ability of a substane to undergo a chemical reaction
e.g.alkali metals - react with water!
reactant + reactant ---> products
hydrogen + oxygen --> water