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.
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?