Matter
Chemical Changes
Atomic Structure
Nuclear Chemistry
Random
100
The difference between a pure substance and mixture is that a pure substance has a fixed composition, while a mixtures may vary. Also a mixture may be seperated through physical means, while you might have to go through chemical reactions to seperate a compound.
What is the difference between mixture and pure substances? Give examples for each.
100
Potential energy is usually energy in stored form, not in use yet. Kinetic energy is energy in motion.
What is the difference between potential and kinetic energy? Provide an example.
100
Proton - Positively charged in the nucleus Neutron - no charge in the nucleus Electrons - Negatively charged in the electron cloud
Discuss the charge and location of protons, neutrons, and electrons in the atom.
100
Gamma rays
Which is the most harmful? Alpha, beta or gamma rays?
100
Chemical change
What kind of change is burning wood?
200
A theory is a well tested explanation for a broad set of observations, while a law is a concise statement that summarizes the results of many observations and experiments.
What is the difference between theory and law?
200
Physical change
What kind of change is melting ice?
200
Atomic mass number - Atomic number = number of neutrons
How do you find the number of neutrons in an element?
200
28 neutrons
How many neutrons does Vanadium have? Atomic number-23 Atomic mass- 51
200
A=Ao(.5)^t/h
What is the half life formula
300
Saltwater-Homogeneous Vegetable soup- heterogeneous fruit salad- heteragenous
Classify the following as homogeneous or heterogeneous: Saltwater Vegetable Soup Fruit Salad
300
Law of Conservation of mass
What does this demonstrate? CH4+2O2 ----> CO2+2H2O
300
Atomic masses vary because of the different isotopes of an element. Each Isotope has a varying amount of neutrons. The weighted average of all the isotopes is the atomic mass.
Why are atomic masses not whole numbers?
300
the conversion of an atom of one element to another element
What is transmutation?
300
Different versions of an element with varying amounts of neutrons
What are isotopes?
400
solids- definite shape definite volume liquids- indefinite shape, definite volume gases- indefinite shape, indefinite volume.
Characterize between solids liquids and gases
400
A chemical reaction does not change the elements, while transmutation does.
What the difference between a chemical reaction and transmutation?
400
This experiment demonstrated Rutherford's theory of the structure of the atom. Alpha particles were aimed at a gold foil. Most passed through, while some bounced back at the source. Gave support for nucleus.
What is the Gold Foil Experiment?
400
a helium atom.
What is an alpha particle?
400
homogenous
Classify as homogeneous or heterogeneous. -blood
500
Steps in the scientific method include making observations, testing hypotheses, and developing theories.
Explain the Scientific Method.
500
In any chemical reaction, energy is neither created nor destroyed.
Explain the Law of Conservation of Energy
500
Plum pudding is the structure proposed by thomson. It proposed a dense positively charged atom, with negatively charged particles spread throughout
Explain Plum Pudding
500
8.75 grams
How many grams of a 10 gram sample would have decayed after exactly three half-lives?
500
3 days
If the half-life of iodine-131 is 8.10 days, how long will it take a 50.00 g sample to decay to 6.25 g?
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