17 terms

7th Grade Science Exam Review

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Scientific Method
A series of steps followed to solve problems including collecting data, formulating a hypothesis, testing the hypothesis, and stating conclusions.
Hypothesis
A testable prediction, often implied by a theory
Independent Variable
variable that is manipulated
dependent variable
The outcome factor; the variable that may change in response to manipulations of the independent variable.
Constant
something that stays the same
control group
the group that does not receive the experimental treatment.
Atom
the smallest unit of an element that maintains the properties of that element
Reactant
a substance or molecule that participates in a chemical reaction
product
a substance that forms in a chemical reaction
Law of Conservation of Mass
a law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
Matter
anything that has mass and takes up space
Physical Change
a change of matter from one form to another without a change in chemical properties
Chemical Change
a change that occurs when one or more substances change into entirely new substances with different properties
Chemical properties
a property of matter that describes a substance's ability to participate in a reaction
Characteristic properties
Characteristic properties- the properties most useful in identifying a substance; these properties are always the same.
Reactivity
the ability of two or more substance to combine and form one or more new substances
Thermal Conductivity
the rate at which a substance transfers heat