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1. MATTER
2. What is Chemistry? Chemistry – the study of matter, its structure, properties, and composition, and the changes that matter undergoes
4. View GPB Episode 201Physical and ChemicalProperties and Changes
13. Intensive and Extensive Properties Extensive Properties
depend on how much of a particular sample is on hand Intensive Properties
do not depend on how much sample is present
14. Density The amount of stuff in a given space
Density is a ratio of mass to volume
Density = Mass
Volume
15. Problems Calculate the density of a material that has a mass of 52.457g and a volume of 13.5 cm3.
D = 53.457g = 3.96 g/cm3
13.5cm3
How many grams of tin would occupy 5.5 cm3, if it has a density of 7.625 g/cm3?
7.625 g/cm3 = X X = 42 g
5.5cm3
Pure gold has a density of 19.32 g/cm3. How large would a piece of gold be if it had a mass of 318.97grams?
19.32 g/cm3 = 318.97g X = 16.51 cm3
X
19. Watch GPB Video 202Classification of Matter
20. Classification of Matter All matter can be put into two categories; pure substances and mixtures
21. Pure Substances All samples have the same properties or characteristics and have identical composition
They cannot be separated by physical methods
Elements and Compounds are pure substances
22. Element
23. Elements in Nature
24. Diatomic Elements Are always bonded to themselves in free state (ex: O2)
25. Compounds
26. Mixtures a blend of two or more substances that are not chemically combined
Salt water or Air
27. Characteristics of Mixtures
28. Homogenous Mixture components are uniformly dispersed (same throughout).
Often referred to as Solutions
Ex: Salt water or air
29. Heterogeneous Mixture components are not uniformly dispersed (different).
Ex: Pile of Salt and Pepper
33. Matter Test Basics of 3 Phases of Matter
Physical/Chemical Properties & Changes
Law of Conservation of Matter
Density Calculations
Intensive/Extensive Properties
Distinguish Between Pure Substances & Mixtures
Elements: Properties
Compounds: Properties
Mixtures: Properties
Distinguish Between Homogeneous/Heterogeneous Mixtures
34. States (Phases) of Matter What are the general properties of the three states of matter?
35. SOLID Holds its shape
Has a definite volume
Particles are in fixed positions
36. LIQUID Has a definite volume
Takes the shape of its container
37. GAS Has no definite shape or volume
Expands to fill its container
Easily compressed
38. Properties set of characteristics by which the substance is recognized
39. Physical Properties observed without altering the identity of the substance
40. Chemical Properties Can only be observed by altering the composition of a substance
41. Changes in Matter