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Physical Scien. ch10

Physical and Chemical changes

QuestionAnswer
mixture a physical combination of substances that remain the same
solution a mixture with parts that blend so that it looks the same -- even under a microscope!
physical change alters the form of an object but not its substance
sublimation change of state directly from a solid to gas
compound formed by the combination of two or more solutions
chemical change occurs when atoms break their old links and form new links with other atoms (ie:baking soda and vinegar)
base 1.turns red litmus paper blue 2. bitter 3. feels soapy
acid 1.tastes sour 2. dissolves in water 3. turns blue litmus red
neutralization the process of acids and bases combining to form neither an acid nor a base.
colloid a mixture with parts that are small enough NOT to form layers (mayonnaise and cool whip)
boiling point temp. at which a substance boils -- water boils 100 C or 212 F
solute the part of the solution that dissolves
electrolyte substance that forms ions when dissolved (can conduct electricity)
alkalinity vs acidity strength of its base vs strength of the acid
What are common uses for acids and common uses for bases? Acids:making plastic,cleaning steel,digesting food. Bases:cleaning drains,making fertilizer, and making detergents.
How does a hot air balloon work? When the heat going into the balloon increases, the balloon EXPANDS and RISES! When the heat in the balloon decreases the balloon CONTRACTS and SINKS.
reactant versus product C + O2 *reactant -- the chemicals that are combined *product -- what is formed
How are chemical reactions related to photosynthesis? plants use chemicals from the sun to react with chemicals in the leaves -- this reaction creates a new substance SUGAR!
What factors affect matter changing from one state to another? 1. decrease or increase of heat (energy) 2. boiling and freezing points vary 3. contracting and expanding of its ATOMS
Explain how to determine if a solution is an acid or a base.
What are three ways to separate a mixture? *distillation- separate based on boiling points *magnet - separate iron from objects *centrifuge- spins/separates based on density
What are three types of mixtures? heterogeneous (salad) colloid (gelatin) solutions (salt water)
Created by: Team 5