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random stuff
100
1) All matter is made of atoms. Atoms are indivisible and indestructible. 2) All atoms of a given element are identical in mass and properties 3) Compounds are formed by a combination of two or more different kinds of atoms. 4) A chemical reaction is a rearrangement of atoms.
Who is John Dalton
100
D=1.95 g/cm3 V=6 cm3 M?
What is 11.7
100
What are the 3 parts of an atom
Proton Neutron Electron
100
What tool do you use to measure the volume of a square object? What is the unit of measure?
What is ruler Milimeters
100
What makes one atom different from another?
What is number of protons and electrons
200
What is that if you cut something in half again and again, you would at last have to stop. He said that this last piece of matter could not be cut any smaller.
What is Democritus
200
d=.55g/cm3 m=4.4 g v=?
What is 8 cm3
200
terms and change in temperature solid to liquid= liquid to solid= liquid to gas= gas to liquid= solid to gas
What is melting increasing freezing decreasing vaporization Increasing condensation decreasing sublimation increasing
200
What method would you use to measure the volume a person? What tool do you use What is the unit of measurement
What is water displacement Graduated cylinder Milliliter
200
What are some of the characteristics of sulfur?
look: yellow mineral non metal smell: Stinky Atomic number 16 Mass-12.42 g Density=2.07 g/cm3
300
After the cathode ray experiments it was established that the emitted ray was formed by negative charges, because they were attracted by the positive pole. He knew that the atoms were electrically neutral, but he established that, for this to occur, an atom should have the same quantity of negative and positive charges. The negative charges were named electrons (e-).
Who is JJ Thompson
300
d=10 m=10.1 v=?
What is v=1 cm3
300
a particle of matter that is made up of a group of atoms that have been chemically combined
What is Molecule
300
the spreading of particles from areas of high concentration to low concentration Three examples of diffusion
What is diffusion
300
How many elements elements can be found in nature? Where are they listed
What is about 92 or close to 100 Periodic table of Elements
400
main elements of the atom are clear using alpha radiation, plus the discovery that atoms of an element may occur in isotopes. Isotopes vary in the number of neutrons present in the nucleus. Although this model was well understood, modern physics has developed further, and present-day ideas cannot be made easy to understand
Who is Ernest B Rutherford
400
mass=48.5 g volume=2 cm Density?
What is 24.25 g/cm3
400
Which particles of an atom are charged and are called "light" particles? They also determine the state of matter
What is electron
400
What too to you use to measure mass? What unit are they measured in?
What is triple beam balance Grams
400
model of the atom says that electrons do not travel in definite paths around the nucleus. ? The exact path or position of moving electron cannot be predicted or determined. Rather, there are regions inside the atom were electrons are likely to be found.
Who are Erwin Schrodinger and Werner Heisnburg
500
Electrons in atoms orbit the nucleus. The electrons can only orbit stably, without radiating, in certain orbits (called by Bohr the "stationary orbits"[5]) at a certain discrete set of distances from the nucleus. These orbits are associated with definite energies and are also called energy shells or energy levels. In these orbits, the electron's acceleration does not result in radiation and energy loss as required by classical electromagnetics. the bohr model of an atom was based upon Planck's quantom theory of radiation. Electrons can only gain and lose energy by jumping from one allowed orbit to another, absorbing or emitting electromagnetic radiation with a frequency ν determined by the energy difference of the levels according to the Planck relation:
Who is Neils Bohr
500
D=18.33 g/cm3 v=6cm3 M=?
What is M=55 g
500
what does the atomic number mean what is the biggest naturally occurring element what is a organic compound
What is number of protons in nucleus carbon one that has energy and matter
500
How do you measure density? What is the unit of measure
What is d=m/v g/ milliliters or g/millimeters
500
increase in mass w/o changing volume will ? density increase in volume without changing mass ? density increase in speed ? in density decrease in speed ? in density increase in temp ? volume decrease in temp ? volume
What is increase decrease decrease increase increase decrease