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Unit 1 Vocab
Words and definitions from 7.SCI Unit 1 (mixtures and experimental design)
Term | Definition |
---|---|
Observation | Something you notice using your five senses (sight, hearing, smell, taste, touch) |
Inference | Something you know based on observations and prior knowledge |
Testable question | A question that is factual, quantifiable (has numbers), can be answered with a scientific experiment. |
Quantifiable | Something that can be measured or counted. Has numbers |
Hypothesis | An educated guess based on prior knowledge that can be tested by experiment or observation |
Independent Variable | Variable that the scientist changes or manipulates |
Dependent variable | Variable that is measured for the results of the experiment |
Control group | A normal group under standard conditions that does not receive the independent variable. Used for comparison |
Experimental group | Groups that receive the independent variable |
Constants | Things that need to be kept the same in an experiment. |
Conclusion | A summary of what you learned from an experiment |
Mixture | A combination of different substances that can be separated by physical means |
Pure substance | Substance with only one kind of molecule (ex: gold, water) |
Solubility | The ability of one substance to dissolve (disappear) in another substance (usually water) |
Dissolve | When something hides or disappears in water |
Magnetism | A magnetic (attractive) force that picks up metals like iron, cobalt, and nickel |
Density | Amount of mass per unit of volume. Can be used to separate mixtures because if something is less dense it will float and if something is more dense it will sink. |
Evaporation | The process by which molecules of a liquid (like water) absorb energy and become a gas |
Data table | Place where the results of an experiment are kept Collects and organizes information |
Solubility graph | Shows the solubility of different substances at different temperatures |
Invalidate | To make our data unusable To mess up our experiment |
Central idea | What the text is mainly about |