What is the difference between Solids, Liquids, and Gasses?
Solids have tight, compacted molecules with a dense molecular structure and a definite volume.
Liquids have a definite volume but will take the shape of it's container.
Gasses dont have a definite volume and they flow.
100
What are the various chemical and physical changes?
Freezing, melting, vaporization, condensation, burning, sublimination, and depostition
200
Why do elements in families/groups on the periodic table have similar chemical properties?
What is valance electrons
200
What are the phase changes? What do they do?
What are melting, freezing, vaporization, condensation, and sublimation/ deposition-different substances "sublime off" at different temperatures
200
What are the implications of the Law of Conservation of Mass, the Law of Definite Proportions, and the Law of Multiple Proportions?
Law of Conservation of Mass: The total mass of all products of a chemical reaction is equal to the total mass of all reactants of that reaction.
Law of Definite Proportions: States that a chemical compound always contains exactly the same proportion of elements by mass.
Law of Multiple Proportions: If two elements form more than one compound between them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers
300
What are the names of the families/groups on the periodic table?
What is Alkali metals, alkaline metals, Transition metals, metalloids, Life elements, Halogens, Noble gases, Non-metals
300
Between which two phases do each phase change occur?
Freeze between Solid and Liquid, Condense between Liquid and Gas, Melt between Solid and Liquid, Evaporate between Liquid ang Gas.
300
What is the difference between a colloid, suspension, and a mixture using the Tyndall Effect?
Colloid: The light is dispersed by colloidal particles
Suspension: Variable
Mixture: none -- light passes through, particles do not reflect light
400
Which elements are metals? Which elements are non-metals?
The metal elements are in columns 1-13 and the non-metals are in columns 14-16.
400
What is the difference between Extensive and Intensive properties?
Extensive: Depends on the amount of matter
Intensive: Inherent in the material *not dependent on the amount
400
What is distillation, filtration, chromatography, sublimination, crystalization?
Distillation: Different substances boil off at different temperatures
Filtration: DIfferent sizes are sepearted
Chromatography: Different substances have different affinities for the solvent
Sublimination: Different substances "sublime off" at differnet temperatures
Crystalization: Crystals exclude other substances as they form
500
How is the arrangement of elements on the table related to valence electrons in an atom?
The column it is placed in correlates to the number of valence electrons in the element.
500
What is the the difference between Chemical and Physical properties?
Chemical: Any change that results in the formation of new chemical substances.
Physical: Rearranges molecules but doesn't affect their internal structures.