Science Midterms
Terms
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- What is science?
- a system of knowledge and methods used to find more knowledge.
- Define Technology
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Use of knowledge to solve practical problems.
**Advance in science lead to advance in technology - what is a scientific method and what is it's goal?
- it is plan for gathering, organizing, and communicating info. its goal is tosolve a problem or to better understand an event.
- Name the steps of the scientific method...
- Make an observation, Form a hypothesis, test your hypothesis, draw your conclusion, and develop a theory.
- What are independent variables and dependent variables?
- Indpt variables are the ones that cause a change in the dependent variable.
- What is a scientific law?
- A statement to summarize a pattern in nature.
- What are models in science?
- 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 - Describe heterogeneous and homogeneous mixtures?h
- 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. - Name three types of evidence for a chemical change.
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Change in color
Production of gas
Forming of a precipitate -
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. -
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 - What r endothermic and exothermic phase changes?
- 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