Chemistry is a “science”. A science is a body of organized knowledge that is continuously updated through inquiry – includes testable explanations and predictions. Chapters 1 & 2 Matter and Change. 1.1 Chemistry. The study of the composition of matter and the changes that matter undergoes.
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The study of the composition of matter and the changes that matter undergoes.
There are five branches:
Organic, inorganic, analytical, physical, and biochemistry
An approach to problem-solving
Observation of a problem
Hypothesis: educated guess, possible solution
Experiment: collecting data, testing variables
Theory: well-tested explanation, conclusion
Law- a statement of fact regarding natural phenomenon, does not explain why.
(See examples on p R47- 49)
Ex. Grinding, melting, boiling
Ex. Burning, corroding, gas formation,
They can be separated by simple means using the differences in their physical properties.
Ex. Filtering, sifting, distilling, using a magnet
Heterogeneous – more than one phase can be observed. They are not uniform throughout.
Homogenous- appears uniform throughout
Sometimes called solutions
Pure substances are classified as either an element or a compound.
Shows 1 atom of silver, 1 atom of nitrogen and 3 atoms of oxygen combine to form silver nitrate.
Ex. Iron + Sulfur -- Iron Sulfide
Identify the reactants.
Identify the products.
What is the total mass of the products formed?