ch 1

chemistry
study of matter and changes that it undergoes
chemical
any substance that has a definite composition
matter
anything that has mass and takes up space
mass
a measurement that reflects the amount of matter
troposphere
air we breath, clouds, layer we see when we are in an airplane
troposphere
air we breath, clouds, layer we see when we are in an airplane
staratosphere
ozone is located and formed
DMD Dobson
1st person to begin measuring ozone. Dobson measured levels of more than 300 Dobson units.
weight
a measurement of the amount of matter and the effect of the Earth’s grav. pull on that matter. Weight changes. Mass does not change
macroscopic
something that you can see without a microscope
submicroscopic
can’t see it with a microscope
organic chemistry
most carbon-containing chemicals
inorganic chemistry
matter that does not contain carbon
physical chemistry
the behavior and changes of matter and the related energy changes
analytical chemistry
components and composition of substances
biochemistry
matter and processes of living organisms
scientific method
a systematic approach used in scientific study. It is an organized process used by scientists to do research and it provides a method for scientists to verify the work of others
observation
the act of gathering info
quantative
numerical
Ex. temperature,pressure, volume, density
qualitative
describe something , senses
hypothesis
a tenative explanation for what has been observed
experiment
a set of controlled observations that test a hypothesis. We use experiments to test variables.
independent variable
variable you plan to change
dependent variable
changes in a response to a change in the independent variable
constant
a factor that is not changed through the whole experiment
dependent variable
changes in a response to a change in the independent variable
controlled
standard for your experiment
conclusion
a judgement based on the info obtained. A hypothesis is never proven. It is either supported or not supported .
model
a visual, verbal, and/or mathamatical explanation of data. Ex. graph
theory
an explanation supported by many experiments . It can be modified due to new conclusions
scientific law
a relationship in nature that is supported by many experiments . A scientific law will never change.
pure research
seeks to gain knowledge for the sake of knowledge itself
applied research
research undertaken to solve a spec. prob.
chance discoveries
experiments come out with unexpected results ; Ex. Alexander Fleming- discovered that lysozyme helps protect the body from bacteria and disvoered penicillium 2- Wallace Carothers and his team discovered nylon
technology
practical use of scientific info ; concerned with human life and the world around us