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Physical Scien. ch10
Physical and Chemical changes
| Question | Answer |
|---|---|
| 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
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