A Story of Two Substances
any substance with a definite composition
What is a chemical?
anything that has mass and takes up space
What is matter?
the act of gathering information
What is an observation?
the part of an experiment that is controlled by the experimenter
What is the independent variable?
A chemical that protects organisms from UV radiation. Made when oxygen comes in contact with UV radiation
A chemical made up of chlorine, flourine, and carbon
What is a chlorofluorocarbon?
a visual, verbal, or mathematical representation of how things occur
What is a model?
A judgement based on the information obtained during an experiment
What is a conclusion?
67, 200 pounds, 20 degrees, 5 mph
What is quantitative data?
the practical use of scientific research
What is technology?
can be seen without a microscope
What is the macroscopic world?
long hair tied back, closed toed shoes, no loose clothing
What are examples of lab safety?
an explanation supported by many experiments; used to make predictions
What is a theory?
the difference between qualitative and quantitative data
What is qualitative describes physical qualities (size, color, shape) and quantitative describes numerical information (amount, number)?
the part of the experiment that results from the independent variable
What is the dependent variable?
too small to be seen under an ordinary microscope
What is submicroscopic?
air, atoms, the sun, textbook
What are examples of matter?
a tentative explanation; an educated guess
What is a hypothesis?
What is qualitative data?
branch of chemistry that focuses on components and composition of chemicals
What is analytical chemistry?
the stratosphere, where planes fly
What is the location of the ozone layer?
branch of chemistry that focuses on carbon-containing chemicals
What is organic chemsitry?
in a typical plant growth experiment: the type of plant, the soil, the amount of sunlight
What are examples of a constant?
research used to solve a problem, may result in chance discoveries
What is applied research?
UV radiation causes CFCs in the atmosphere to break down. Chlorine breaks down ozone
What causes ozone depletion?