Chapter 3-4 Flashcards
Scientific Perspective
Leads to research and explains natural phenomena
Technological Perspective
Concerned with development and use of machines instruments and processes that have a social purpose
Ecological Perspective
Considers relationships between organisms and the environment
Economic Perspective
Focuses on the production, distribution, and consumption of wealth
Political Perspective
Involved governments, vote, getting actions, or arguments based on ideology
Physical Change
Any changes where the fundamental entities remain unchanged at a molecular level, there is no change in the chemical formula
Chemical Change
Involves some kind of change in the chemical bonds within the fundamental entities of a substance, there is a change in chemical formula. New substance
Is formed with different physical and chemical properties
Nuclear Change
Changes within the nucleus, creates entirely new atomic entities, formulas show new atomic symbols different from original matter
Kinetic Molecular Theory
Smallest entities of a substance are in continuous motion
Why do chemical reactions occur
Collisions between entities, if the collision has a certain orientation and sufficient energy they will rearrange to form new entities
Evidence for Chemical Reactions
Colour change, odour change, state change (formation of a precipitate), energy change (release or absorption)
Law of conservation of mass
The total mass of matter present after a chemical change is always the same as total mass present before
Balanced Chemical Equation
Total number of each kind of atom or ion in the reactants is equal to the total number of the same kind of atom or ion in the products
Chemical amount
SI quantity for the number of entities in a substance measured in units of moles
Avogadro’s number
6.02 x 10^23 (mole)
