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helps put investigation of questions into some type of order, formal/organized method for doing science
the synthesis of info that contains well tested and verified hypothesis about certain aspects of the world
- more easily backed up
- measuring data using #s give more proof to your answer
changes that occur in an experiment that are directly caused by the experimenter
identical experiment without the variable to be tested; the original state of item to be experimented upon
atoms in a substance are rearranged to give a new substance having a new chemical identity
atomic symbol and a numerical subscript to indicate the numer of atoms grouped together
Physical Change (definition)
a change in which a substance changes its physical properties without changing its chemical identity
a new material formed in a chemical reaction, appearing after the arrow in a chemical equation
a starting material in a chemical equation, appearing after the arrow in a chemical equation
Characteristics that can only be observed when one substance changes into a different substance.
What happens to the atoms during a chemical change?
the atoms rearrange to form a new material different from the starting material
Phases of matter:
solid - definitine shape and volume
gas - no definite shape or volume
liquid - no definite shape, but definite volume
plasma (high energy) - can't be contained
freezing, melting, vaporization, condensation, sublimation
the mass of an element's atom listed in the periodic table as an average value based on the relative abundance of the element's isotope
atoms of the same element whose nuclei contain the same number of protons but different numbers of neutrons
the number of nucleons (protons and neutrons) in the atomic nucleus. Used primarily to identify isotopes.
neither a metal nor a metalloid, poor conductor of electricity and heat, may be transparent, not malleable or ductile
Which elements have the highest and lowest ionization energies?
highest: upper right
lowest: lower left
represents a systems and helps use to predict how it behaves (i.e. Niels Bohr's planetary mode)
What did Bohr reason about the orbits?
Bohr reasoned that orbit have different energy levels and that if an electron moves from one energy level to another it emits photons (particle of light).
Explain Bohr's planetary model?
it was a conceptual model
the electrons traveled around the nucleus in definite orbits (like the planets orbiting the sun)
Principal quantum number n
an integer (#) that specifies the quantized energy level of an atomic orbital
(chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance
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