Matter and Change. Unit 2. Chemistry is the study of matter and the changes that take place with that matter. Matter is anything that has mass and volume . Examples of Matter. States of Matter (Review). separation. separation. compound. element. chemical. matter. solution. physical.
Chemistry is the study of matter and the changes that take place with that matter. Matter is anything that has mass and volume.
Based on the picture below, how would you define homogeneous and heterogeneous?
Uniform in appearance and composition; A mixture of 2 or more pure substances that are evenly mixed throughout
VARIED in composition and appearance; A mixture of 2 or more pure substances in an unfixed ratio
What's the ratio of Red : Blue?
A combination of 2 or more substances that are
not chemically combined and have variable
A homogeneous mixture composed of
one phase of matter
Pure Substance: a chemical substance with a fixed composition
Element: has only one type of atom
Compound: a combination of 2 or more elements chemically combined.
Physical Separation (of a mixture)
No new substance
This technique separates substances on the basis of differences in solubility in a solvent.
In filtration solid substances are separated from liquids and solutions.
Distillation uses differences in the boiling points of substances to separate a homogeneous mixture (solution) into its components.
Chemical Separation (of a compound)
Compounds can be broken down into more elemental particles.
Compounds can be broken down into 2 or more elements
Physical properties describe characteristics like
Can be a change in PHASE as a result of heating, cooling, or pressure.
Also covers changes in the size of the substance WITHOUT CHANGING THE CHEMICAL IDENTITY
CO2 gas and H2O vapor
Physical changes can
do some of these too!