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Science Chapter 2
Ali Grade 5
| Question | Answer |
|---|---|
| Changes in Matter | Physical Change - same chemical properties Chemical Change - matter changes, different properties. solid, liquids and gases are all changes of matter. |
| Physical Changes | Changes in size,shape, and state of matter.raindrops and sleet are both water but look different, same chemical properties. |
| Chemical Changes | One kind of matter changes into something different, matter changes different properties. |
| evaporation | it takes place when particles leave a liquid and become a gas. |
| condensation | occurs when a gas turns into a liquid |
| sublimation | solids that change directly to gases without first becoming liquids in a process dry ice is one example |
| reactant | a substance used in the reaction |
| product | a substance made by the reaction |
| chemical equation | shows what happens during a chemical reaction |
| phases | solid, liquids, and gases are all a phase. another word for phase is a state. |
| collide | to bang into another, it can even crash into another |
| ores | types of rock that include metals |
| evidence of chemical changes | burning, crystals form, may produce a gas or solid |
| states of matter | solids, liquids, and gas are a state of matter. |
| solids and liquids | water is a liquid when unfrozen and a solid when frozen. |
| freezing and melting | freezing is when a liquid turns into a solid and melting is when a solid goes into liquid |
| particles in motion | materials change size when they change temp. Generally smaller when cooler and larger when warmer. |
| gases | it's compared to solid and liquids, particles of a gas are very far apart |
| chemical reactions | Reactants react to make products |
| matter is always conserved | it can not be created or destroyed during a chemical reaction. |
| types of chemical reactions | 3 types: combination, decompostion, replacement reactions |
| examples of chemical reactions | |
| separating mixtures | it can be hard to chip limestone from a fossil without damaging the fossil need example |
| separating mixtures from ores | people may use chemical properties to separate metals from their ores |
| separating solutions | sometimes chemical properties can be used to separate elements from solutions |
| identifying substances | indicator paper is helpful, though, in providing clues to identify of a substance. |
| decomposition reaction | compounds split apart to form smaller compounds or elements |
| combination reaction | elements to compounds come together to form new compounds |
| replacement reaction | the part that switch places |
| bases and acids | bases cause universal indicator paper to turn shades of green, blue, and purple. acids make the paper turn orange or red |
Created by:
alikat
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