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Imagine that you are looking at pictures sent back of a newly discovered planet.
You are specifically looking for evidence of plate tectonics. What topographic
features would you look for and why?
Plate tectonics will invariably result in the formation of mountain ranges when the edges of the plates collide and one is pushed upward above the other. At the other end...
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Which group in an experiment, is a test group that isn't exposed to the experimental variable?
Control groups figure prominently in medical testing (e.g trials of a drug). They provide a way to measure the natural variation from one subhect to another, and to determine whether...
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An atom that has 117 protons in its nucleus has not yet been made. Once this atom is made, to which period and group will element 117 belong?
Element 117 was synthesized in 2010. Its name is tennessine, and the symbol is Ts. It is in group 17 or VIIA, and period 7. For an up-to-date printable...
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The atomic weight of a newly discovered element is 110.352 amu. It has two naturally occurring isotopes. One has a mass of 111.624 amu. The other has an isotopic mass of 109.75 amu. What is the percent abundance of the last isotope (109.75 amu)?
The idea here is that each isotope will contribute to the average of the element proportionally to their respective abundance. Now, the key to this problem lies in how you...
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The atomic weight of a newly discovered e ement is 98.225 amu. It has two naturally occuring isotopes. One isotope has a mass of 96.780 amu. The second isotope has a percent abundance of 41.7%. What is the mass of the second isotope?
$M_r=(sum(M_ia))/a$, where: $M_r$ = relative attomic mass ($g$ $mol^-1$) $M_i$ = mass of each isotope ($g$ $mol^-1$) $a$ = abundance, either given as a percent or amount of $g$...
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The atomic weight of a newly discovered element is 10.600 amu. It has two naturally occurring isotopes. One has a mass of 10.000 amu
and a natural abundance of 70.000%. What
is the isotopic mass of the other isotope?
So, $10.600 (mass$ $units) = 70%xx10.000 + 30%xxM_2;$ where $M_2$ is the isoptopic mass of the other isotope. So solve for $M_2$! A priori would you expect $M_2$ to...
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Suppose element X is a poor conductor of electricity and breaks when hit with a hammer. Element Z is a good conductor of electricity and heat. In what area of the periodic table does each element most likely belong?
Metals are good conductors of electricity and heat. the text doesen't tell anymore and Z may be one of abaut 90 known metals, in the left area of . X,...
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To which group in the periodic table does lithium belong? How many valence electrons does it have?
The groups of are organized in columns (from top to bottom) and some have specific names, while some are part of a larger grouping. For example, group one is the...
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How do you draw the Lewis Structures of each of the following acids? These structures, like most acids, have each H attached to one of the oxygens.
Sulfuric acid is easy: $HO-S(=O)_2(OH)$, we have a $S(VI+)$ oxidation state. Alternatively, I could represent this as $HO-""^(2+)S(-O)_2^(-)(OH)$. For $"iodous acid"$ I have a formal $I^(III+)$ oxidation state: $O=I-OH$ This...
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Magnesium, atomic number 12, has the electron configuration $[Ne]3s^2$. To what group does magnesium belong?
How do you remember it's Group 2. Well the best way is to consult a Periodic Table, and note the position of $Mg$, $Group$ $2$, and $Period$ $3$. You should...
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