Created by celissamayan
about 10 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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