Chem 120 Ch. 1 review Flashcards
What are elements
a substance made of only one type of atom
What are compounds
a substance that is made of 1 type of atom PLUS it is bonded to another type of atom. All the same amount of the substances are bonded
What is a mixture
Differnt types of atoms and compounds floating in one space
Physical change is to ________ as chemical change is to _________
Mixture:compound
properties of metals
all solid at room temp (except mercury), shiny, malleable, ductile, conduct heat/electricity
looses electrons, high densities and melting points
properties of non-metals
gasses, liquids, or solids at room temp, many properties are opposite to metals (brittle, dull, insulating), tend to gain electrons
properties of metaliods
properties are in-between metals and nonmetals. Somewhat malleable, somewhat lustrous, semi-conductive
From a scientific view, the world is _________
understandable
From a scientific view, ideas are __________
subject to change
From a scientific view, science can’t __________
provide all answers to questions
What is scientific inquirey
The diverse ways scientists study the world and provide evidence
What is scientific enterprise
lots of companies, intuitions, ect. want to study science in order to improve life. This means science is a complex social activity
What are some of the ethical principles in science?
accurate record keeping, openness, and replication, harm to participants from experiments, harmful impact of releasing info (chemical warefare)
Describe the scientific method:
- state hypothesis
- test hypothesis
- refine hypothesis
Define Theory
a generalized statement that explains a larger number of obervations
Define Law
Specific statment that is thought to never be violated
Define Natural Universe
anything that occurs to us naturally
Define Contrived
made up
The fundimental components that make up elements (aka protons, neutrons, electrons) __________ only be combined or separated through chemical means
can not
Define a pure substance
A substance where its entire chemical make up is consistant and has the same physical/chemical properties throughout
name some pure substances
elements and compounds
