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15 Cards in this Set

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  • Back
What is science?
a system of knowledge and methods used to find more knowledge.
Define Technology
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.
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.
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.
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.
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