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15 Cards in this Set
- Front
- Back
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What is science?
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a system of knowledge and methods used to find more knowledge.
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Define Technology
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Use of knowledge to solve practical problems.
**Advance in science lead to advance in technology |
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what is a scientific method and what is it's goal?
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it is plan for gathering, organizing, and communicating info. its goal is tosolve a problem or to better understand an event.
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Name the steps of the scientific method...
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Make an observation, Form a hypothesis, test your hypothesis, draw your conclusion, and develop a theory.
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What are independent variables and dependent variables?
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Indpt variables are the ones that cause a change in the dependent variable.
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What is a scientific law?
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A statement to summarize a pattern in nature.
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What are models in science?
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Representative of an object or event that is too hard to observe directly.
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What is an Element...
an atom... and a compound? |
Element- substance that can't be broken down
Atom- smallest particle of an element Compound- substance made up of 2+ simpler substances/can be broken down/fixed proportion |
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Describe heterogeneous and homogeneous mixtures?h
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het. mixture's parts are noticably different and hom. mixture's are evenly distributed and difficult to distinguish.
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What is a solution ...
a suspension... and a colloid? |
solution- when substances disolve and form a hom mixture
suspension- a het. mixture that seperates into layers over time. colloids- contains some particles that are medium in size. |
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Name three types of evidence for a chemical change.
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Change in color
Production of gas Forming of a precipitate |
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Define kinetic energy...
What's the kinetic theory of matter? |
it is the energy an object had due to its motion...
That all particles of matter are in constant motion. |
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Describe Charle's Law...
Boyle's Law... |
Charles law states that the vol. of a gas is directly proportional to it's temp if the # of particles of the gas r constant.
Boyle's law states that the volume of a gas is inversely proportional its presseureif the temp and # of particles of the gas r constant |
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What r endothermic and exothermic phase changes?
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endothermic phase changes are when the system absorbs energy from its surrounding and an exothermic change is when a system releases energy to its surrounding.
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Describe the six common phase changes...
mfvcsd |
melting=s-l freezing=l-s
vaporization=l-g condensation=g-l sublimation=s-g deposition=g-s |
