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Science Unit 4 Study
| Question | Answer |
|---|---|
| What is a physical change? | Change the way something looks, does not create anything new (tearing paper, shaping clay) |
| What is a chemical change? | A chemical change when two or more substances combine and create something new. Rate of the change is affected by temperature. (baking cake, rusting, yeast reacting with water & sugar, baking soda and vinegar) |
| How does temperature affect chemical change? | Decreasing temperature slows down chemical change |
| Whats the difference between Physical and Chemical change? | Physical change s change the way something looks, does not create anything new. Chemical change is when 2 ore more substances combine and create something new (baking a cake, rusting, yeast reacting with water & sugar, baking soda, & vinegar. |
| What is the state of matter for solids? | particles are packed very tight together, not a lot of energy; fixed volumen and shape |
| What is the state of matter for liquid? | particles can flow past one another, more energy; fixed volume, takes the shape of container. |
| What is the state of matter for gas? | particles are all over the place, lots of energy; no fixed volume or shape |
| How does temperature affect water? | boiling and evaporation (add heat) - phase change that turns water into water vapor |
| How does temperature affect gas? | Condensation (remove heat, add cold) - phase change that turns gas into liquid |
| How does temperature affect liquid? | Melting (add heat)- phase change that turns a solid into a liquid |
| What factors affect whether a substance will dissolve in another substance? | Temperature, size of the particle being dissolved, stir time |
| Will salt dissolve in water? | Yes |
| Will sand dissolve in water? | No |
| What is the difference between mixtures and solutions? | Mixtures are 2 ormore substances that keep their identities; can easily be separated. Solutions are mixtures that have th same composition throughout; cannot easily be separated (lemondade, salt water, food coloring in water. |
| What are some examples of mixtures? | bowl of salad, trail mix, pile of laundry |
| What are some examples of solutions? | lemonade, salt water, food coloring in water |
| Are all solutions mixtures? | Yes |
| Are all mixtures solutions? | No |
| What are atoms? | smallest particles of matter; has mass and takes up space; can be seen with magnifcation. |
| How can you see an atom? | With magnification |
| Which subatomic particles make up an atom? | protons, neutrons electrons |
| What is a proton? | found in the nucleus, positive charge; same as the atomic |
| What are neutrons? | found in nucleus, neutral or no charge |
| What are electrons? | found orbiting the nucleus in electron cloud, negative charge |
| What is density? | mass divided by volume |
| What does the density determine? | whether an object will float or sink in water |
| What will happen to objects with a density greater than 1? | They will sink |
| What will happen to objects with density less than 1? | They will float |
| What will happen to objects with larger masses? | They will sink |
| What will happen to objects with smaller masses? | They may float, depending on the volume |
Created by:
davesam1925
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