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Physical Science C2
physical science test chapter 2
| Question | Answer |
|---|---|
| matter | anything that has mass and takes up space |
| pure substance | substances that have the same prperties throughout and have a definite composition. |
| elements | are pure substances made of one type of atom. Pure gold AU, and pure silver AG, are both examples |
| compounds | are pure substances made of more than one type of atom bonded together. water is an example |
| mixture | combination of two or more substances that are NOT bonded together |
| heterogeneous | not evenly mixed |
| homogeneous | evenly mixed |
| sand in water is a....(heterogeneous or homogeneous) | heterogeneous |
| sugar and salt mixed thoroughly...(heterogeneous or homogeneous) | homogeneous |
| T or F. Can mixtures be classified according to the size of its largest particles? | True |
| solution | one substance dissolves in another substance |
| suspension | mixed substances that separate into layers over time |
| colloid | larger particles of a substance stay in between smaller particles of another substance |
| Y or N. Do all liquids mix. | No |
| miscible | liquids that can mix with eachother |
| immiscible | liquids that do not mix with eachother (water and oil) |
| Y or N. Gases can mix with liquids | yes |
| T or F Physical properties can be observed without changing the composition of the substance | True |
| buoyancy | the ability of a fluid to push up on an object placed in it |
| Y or No chemical properties can only be observed as matter changes in composition | Yes |
| What must be added in order to change a state | energy |
| solids have...2 things | -definite shape-definite volume |
| liquids have...2 things | -NO definite shape- have definite volume |
| gases have... 2 things | -NO definite shape-NO definite volume |
| particles are always in... | motion |
| matter is made up of... | atoms or molecules |
| why do you smell cookies baking? | because the particles heat up and become so hot and ull of motion that they excape from other particles and go into the air |
| how do you melt ice | add heat(energy) |
| how do you freeze water | take heat(energy) away |
| matter can not be ... | created or destroyed |
| energy can not be... | created or destroyed |
| what is a model? | it is a representation of objects or events that can be studied to help understand the real event |
| why do our models need to be flexible? | because science is always changing and that we must not assume that all our models are right and never need to be changed |
Created by:
darrl
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