Chemistry

Chemistry

What is Chemistry

Chemistry: The physical science that deals with matter’s- Composition-Properties - Changes

Matter: anything that has mass = everything

What does it include?

The study of:1) Chemicals2) Chemical reactions3) Chemical technologies4) Chemical toxicity (effects of chemicals on the

environment)

Changes of matterChemical changes: AKA chemical reaction. When

a new substance with new properties if formed

VERSUS

Physical changes: When no new substances are formed.

eg. Boiling, Melting, Freezing

Branches of Chemistry

Branches of Chemistry

Branches of Chemistry

Branches of Chemistry

Branches of Chemistry

Branches of Chemistry

Classifying Knowledge in Chemistry

Observation: - Direct form of knowledge that comes from

one of the five senses (something you saw, smelled, taste, heard or felt)

Types of Observations

Classifying Knowledge

Qualitative Observations: Describes the qualities or changes of mattereg. The color, odor, or physical state (solid liquid gas)

Quantitative Observation:

Classifying Knowledge

Qualitative Observations: Describes the qualities or changes of mattereg. The color, odor, or physical state (solid liquid gas)

Quantitative Observation: The degree of change in matter. It is a measurable value.eg. mass, weight, and force

Observations and Interpretations

Interpretation: An indirect form of knowledge. Something you do not witness yourself (hence indirect). eg. Something you pick out of a text book

Picking out Observed and Interpretative Information

1) Observation: Magnesium metal burns when held in a bunsen burner.

2) Using interpretation to explain observation:

Picking out Observed and Interpretative Information

1) Observation: Magnesium metal burns when held in a bunsen burner.

2) Using interpretation to explain observation: Oxygen molecules collide with the magnesium

metal. Magnesium loses 2 electrons which are then picked up by oxygen. This creates oxygen and magnesium ions

Types of Knowledge

Empirical: Observedeg. Aluminum foil turns red in color of copper chloride

Theoretical:

Types of Knowledge

Empirical: Observedeg. Aluminum foil turns red in color of copper chloride

Theoretical: Explains or describes the observation using theoretical knowledgeeg. Copper ions gain electrons to form copper metal. Aluminum metals lose electrons and form aluminum ions.