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CHS EXAM WEEK 2012
| Question | Answer |
|---|---|
| What is science? | Describes and understands the universe using basic rules that you have discovered through scientific method |
| Independent Variable | The factor that is manipuated during an expirement, x axis |
| Dependent Variable | Varible that is caused by and depends on the value of the independent variable, y axis |
| Control | Shows if the results are accurate or working |
| Constant | Factor that dosent change |
| Matter | Anything that has mass or volume |
| Pure Substance | a substance that cannot be broken down into simpler componets and still maintain the characteristics of the orignial substance |
| Compound | 2 or more elements are combined in fixed portions |
| Element | Substance comosed of same atoms |
| Mixture | Any material made up of 2 or more substances that can be easily separated by physical means |
| Heterogenous | The diffrent materials can be easily distinguished |
| Homogeneous | Contains 2 or more gases, liquds, or solid substances |
| Solution | A homogeneous mixture of particals so small |
| Example of Solution | sugar water |
| Colliod | A type of mixture that never seattles |
| Example of Colliod | fog,milk,smoke |
| Suspension | Heterogeneous mixture, visible paritcles |
| Example of suspension | salad dressing, and muddy water |
| Physical Property | Any characteristic of a material that you can observe withought changing the idenity |
| Physical Change | A change in size, shape, or matter |
| Chemical Property | A characteristic of a substance that indicates whether it can undergo a chemical change |
| Chemical Change | A change to one substance to another |
| What is a constant during a phase change? | Tempature |
| Molecular Theory of Matter | Molecules constanly move |
| Plum pudding model | JJ. Thomson |
| JJ. Thomson | Plum pudding model |
| Niels Bohr | Electrons travel in fixed orbitals around the nuclues |
| Electrons travel in fixed orbitals around the nuclues | Niels Bohr |
| The uncuttable atom | Democritus |
| Democritus | The uncuttable atom |
| Almost all the mass of an atom is found in the nucleus | Ernest Rutherford |
| Ernest Rutherford | Almost all the mass of an atom is found in the nucleus |
| Model accepted today? | Electron cloud model |
| When electrons are shared | covalent |
| When electrons are transfered | Ionic |
| ab+c=ac+b | Single-Replacement |
| ab->a+b | Decomposition |
| ab+cd=ac+bd | Double-Displacment |
| a+b->ab | Synthesis |
| Range of pH scale | 0-14 |
| Acidic? | 0-6.9 |
| Neutral? | 7 |
| Basic? | 7.1-14 |
| Half-Line | Time for 1/2 of a radioactive sample to decay |
Created by:
megawiechs
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