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54 Cards in this Set
- Front
- Back
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According to John Dalton's observations, when elements combine in a compound, what happens? |
The ratio of their masses are always the same |
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How do you calculate the atomic mass of an element? |
The weighted average of the mass and the element's isotopes |
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The Greek philosopher Democritus coined what word for a tiny piece of matter that cannot be divided? |
Atom |
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In periodic table, a set of properties repeats from ...? |
row to row |
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99% of all matter that can be observed in the universe exists in which state? |
Plasma |
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What do scientists use to predict the locations of electrons in atoms? |
Probability |
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If a material contains three elements joined in a fixed proportion, it is a what? |
Compound |
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The number of protons in an atom of an element is that elements what? |
atomic number |
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RutherFord's gold foil experiment provided evidence for what? |
There is a dense positively charged mass in the center of the atom |
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What property of wax makes it useful in making molds? |
a low melting point |
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What is the difference between physical and chemical change? |
Physical change doesn't change the composition of matter like a chemical change does |
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In an electron dot diagram, the symbol for an element is used to represent what? |
Nucleus and all non valence electrons |
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What is the Russian ship in which the ratio of the manipulated variable and the responding variable is constant? |
The direct proportion |
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Moving from left to right across a row of the periodic table, which value increases by exactly from one element to element? |
Atomic number |
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What are the clues a chemical change has taken place? |
Change of color, production of gas, formation, and precipitate |
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What is the unit for atomic mass? |
AMU |
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The tendency of an element to react is closely related to what? |
The number of valence electrons |
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The usefulness of mendeleev's periodic table was confirmed by what? |
The discovery of the elements of the predicted properties |
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One twelfth the mass of carbon - 12 atom is used to define what? |
atomic mass |
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Define viscosity |
A liquids tendency to resist flowing |
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What is the electrons Mass charge? |
Related math 1 / 200 charge is negative |
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In the name carbon dioxide, the prefix of the second word indicates that a molecule of carbon dioxide contains how many of each atom? |
1 carbon, 2 oxygen |
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Typically, atoms gain or lose electrons to achieve what? |
a stable electron configuration |
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You are about to open a container of soy milk but notice that there are instructions to make " shake well before serving." the soymilk is most likely a what? |
Suspension |
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Atoms of the most reactive elements tend to have how many valence electrons? |
1 or 7 |
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What will cause a decrease in gas pressure in a closed container? |
Lowering the temperature |
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Which statement is not true about the elements fluorine, chlorine, and iodine? |
They are similar Noble gases |
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What is the most reactive element in group 7A? |
Fluorine |
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formation of an ionic bond involves what? |
The transfer of electrons |
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What is the difference between an atom in the ground state and an atom in an excited state? |
The atom in an excited state is least stable and has more energy than the atom in the ground state |
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The phase change that is the reverse of condensation is what? |
Vaporization |
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How is 0.00069 written in scientific notation? |
6.9 x 10 to the power of -4 |
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What is the system of knowledge and the methods used to find the knowledge? |
Science |
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In the compound MgCl2, the subscription 2 indicates what? |
There are two chloride atoms for each magnesium atom |
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What method can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter? |
Distillation |
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Flammability is the material's ability to burn in the presence of what? |
Oxygen |
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Which halogen is most likely to react? |
Fluorine |
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JJ Thomson's experiment provided evidence for what? |
That the atom had a smaller tops atomic particle that has a negative charge |
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What is the result of a force distributed over an area? |
Pressure |
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which elements are found in nature only in compounds? |
Alkaline metals and the halogens |
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A substance that is made up of only one kind of atom is an what? |
Element |
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What is a statement that summarizes a pattern found in nature? |
Scientific law |
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What is unique for any given element? |
Number of protons |
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Mindy arranged the known chemical elements in a table according to what? |
increasing atomic mass |
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If an unknown substance cannot be broken down into simpler substances, is it what? |
Compound |
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The phase change that is reverse of sublimation is what? |
Deposition |
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What is a pure substance? |
Elements |
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What type of change occurs when water changes from a solid to a liquid? |
A phase change and a physical change |
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What are branches of natural science? |
Physical science, Earth and space, and life science |
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Who provided evidence for the existence of the nucleus of an atom? |
Ernest Rutherford |
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A mixture that appears to contain only one substance is a what? |
Homogenius mixture |
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At room temperature, none of the metals that are in what state of matter? |
Gases |
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Ionization energies tend to do what when you look at the periodic table? |
Increase from left to right across the periodic table |
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