1586643
Description
Flashcards by celissamayan, updated more than 1 year ago
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Created by celissamayan
over 9 years ago
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| Question | Answer |
| What is science? | Science is a systematic enterprise that builds and organises knowledge in the form of explanations about the universe. |
| Steps of the Scientific Method | 1. Problem/Question 2. Observation/Research 3. Formulate a hypothesis 4. Experiment 5. Collect and analyse results 6. COnclusion 7. Communicate the results |
| Independent Variable | a variable who's variation does not depend on another |
| Independent variable | variable whos variation depends on other factors |
| Control Group | Standard of comparison. "No treatment" group. Same conditions as the experimental group except for the variable being tested. |
| Constant | All the factors that the experimenter attempts to keep the same. |
| Experiment Report Steps thing | 1. Title 2. Hypothesis 3. Aim 4. Materials 5. Method 6. Conclusion 7. Discussion |
| Observation | Recognising or noting a fact or occurence. |
| INference | a conclusion based on observations |
| Endothermic | Requires or absorbs heat (eg photosynthesis) |
| Exothermic | Releases heat or the temperature of substance rises (eg bonfire). |
| MAtter | Anything that has mass and takes up space. |
| Mixture | Any substance that contains at least 2 different types of substances or particles. |
| Heterogenous | mixture can visibly see the 2 particles and can be separated physically (mechanically) |
| Homogenous | mixture cannot physically distinguish the two particles and can be separated chemically |
| Element | Substance that cannot be separated into simpler substances by chemical reactions |
| Compound | Chemical substance of two or more different chemically bonded (attached) elements. |
| Ways to separate mixtures | - centrifugation - crystallization - chromotography -distillation - evaporation - filtration - sublimation - sedimentation - magnetic separation - sieving |
| SOLUTION | mixture made up of one substance dissolved in another (the whole thing for example, coffee). |
| SOLUTE | the dissolved substance (eg. coffee grounds in coffee) |
| SOLVENT | the substance that the solute is dissolved in (eg. milk in coffee) |
| Dilute | describes a solution with a small amount of dissolved substance per volume of liquid |
| Force | A push, pull or twist. It can make things change shape, direction or speed. |
| Everyday examples of force | 1. Moving bike stops when brakes are applied. 2. Pulling a door of a room 3. Kicking a football 4. Throwing a ball |
| Contact force | when two materials/objects need to be touching for a force to have an effect (eg. friction, air resistance, buoyancy) |
| Non- contact force | when two materials/objects DO NOT need to be touching for a force to have an effect (eg. magnetism, gravity, electrostatic) |
| Representing forces | Arrows to represent force. Direction of arrow is direction of force. Length of arrow shows how big the force is. |
| Minimising friction | Polishing, lubricants and streamlining. |
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