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Science 8 Unit I

Physical Science Unit I Test Review

QuestionAnswer
what is an observation? an examination of evidence: facts obtained through your five sense
what is an assumption? an answer NOT based on real evidence
what is a conclusion? answer based on observation, proof and real evidence
what is a law? what actually happens; fact
what is a theory? tries to explain how and why something happens: explains the law
what is physics? the study of energy and how things work
what is chemistry? study of matter and its changes, and what things are made of
what are the five steps of the Scientific Method? • Problem • Information • Hypothesis • Experiment – Materials, Procedure, Data & Diagram Conclusion
what are the three steps that make up the experiment? Materials, Procedure, Data & Diagram
what is a control? a duplicate setup of the experiment performed with everything identical except for the variable tested.
what is a constant? Not changing; all the other things in the experiment that stay the same
what is a variable? What is being tested in the experiment It is important to have only ONE variable in order to know what causes the outcome
what is a control group? Does NOT contain variable
what is an experimental group? Does contain variable
what are the four general properties of all matter? Mass, weight, volume & density
Why is air matter? It takes up space (balloon), has mass, weight, and density
what is mass? The amount of matter in an object
what is the measurement of mass? grams
what is the difference between mass and weight? Mass always stays the same (unless you cut your arm off, get a haircut, or go on a diet) and weight depends on gravity and changes depending in your location (the moon is a smaller planet, so it has less gravity, so you weigh less on the moon).
Why do scientists prefer to measure the mass of matter rather that its weight? Mass will always be the same regardless of location
what is inertia? An object resistance to motion or resistance to its change in motion
what determines the inertia of an object? mass
what is volume? The amount of space an object occupies
How do you get the volume of a rectangular solid? Length x Width x Height
What unit is used to measure the volume of a liquid? Milliters (mL)
What unit is used to measure the volume of a solid? Cubic centimeters (cm3)
How can two things with the same volume have different masses? Different densities
what is density? The amount of mass per unit volume m/v
How do you determine the density of matter? Mass divided by volume
What are the units of density? g/cm3 or g/mL
Does 1 liter of Coke have the same density as 2 liters of Coke? Yes! Same material will have the same density
What are the two sciences that make up Physical Science? Chemistry and physics
Created by: kolinchakm
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