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Unit 1 Vocab

Words and definitions from 7.SCI Unit 1 (mixtures and experimental design)

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
Created by: dellabiology