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The World of Chemistry
Transcript of The World of Chemistry
What is chemistry?
the science that seeks to understand the behavior of matter by studying the behavior of atoms and molecules
Chemical Properties and Changes
How matter changes as a result of contact with other matter or the influence of energy
Qualitative and Quantitative
Standard SI Base Units
Ratio of mass to volume-
Important physical property - used to identify material
Intensive vs. extensive
Composition does not change from one sample to another
Matter -anything that has mass and occupies space
Average Kinetic Energy
Thermal Energy Flow
– precursor to modern Chemistry – conversion of base metals into noble metals
- Chemical combination of elements that can be broken down to those elements
Smallest particle of an element that has the chemical properties of element
Building blocks of Matter
Cannot be broken down by chemical reaction
Smallest unit of a compound that retains the chemical characteristics of the compound
Combination of two or more pure substances in which the composition may vary from one sample to another
Does not have a uniform composition throughout
Has a uniform composition throughout
3 States of Mater
No Fixed Shape
Crystalline & Amorphous
Expand to fill container
Physical Properties and Changes
Changed, observed or measured without changing composition.
Melting & boiling point
Dissolving to make a solution
Both physical and chemical changes, result in matter either gaining or releasing energy
move to lower PE
Law of Conservation of Energy
Energy is neither created nor destroyed. The total amount of energy in the universe is constant.
It may change forms or flow from one object to another.
High Potential Energy Systems are less Stable
Systems with high potential energy have a tendency to change in a way that lowers their potential energy
Chemical reactions (combustion)
Kelvin - absolute
Derived Units - Volume and Density
Vol. - a cubic length
all certain + 1 uncertain
Estimating in measurements
Accuracy vs. Precision
Number of digits indicates certainty, uncertainty in last reported digit, +/- 1
A piece of copper has a mass of 57.54 g. It is 9.36 cm long, 7.23 cm wide, and 0.95 mm thick. Calculate density.
Accuracy and Precision
Topic You Need to Know But not Lecturing Over (parts of section 1.6, 1.7, 1.8 and Appendix 1)
using in calculations
Metric Unit conversion
Conversion of Units
Problem Solving/Dimensional Analysis
Changes in Matter