Answers edited by JJ

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• Substance A will not dissolve in water. What can be said about substance A?
  
• What does ionic radii mean?
  
• Group 18 rarely combines with other elements. They are the "loners" or noble gases. Why do these elements not need to bond with other elements?
  
• How do you evaluate `-\frac { 5} { u - 6} = \frac { 5} { 2u - 12} + 3`?
  
• What are some common mistakes students make with acid and base dissociation?
  
• Question #ebcea
  
• How do you factor the polynomials `rp-9r+9p-81`?
  
• What controls how fast a chemical reaction occurs?
  
• How do you find the zeros, real and imaginary, of `y=4x^2-2x+3` using the quadratic formula?
  
• Factorize `(X^2+Y^2)^3+(Z^2-X^2)^3-(Y^2+Z^2)^3` ?
  
• Question #c4cb7
  
• What volume of `18*mol*L^-1` `H_2SO_4(aq)` is needed to make a `250*mL` volume of solution that is `0.50*mol*L^-1` with respect to `H_2SO_4`?
  
• What is percent error/percent deviation?
  
• Question #d648e
  
• How do you solve `9x ^ { 2} = 4+ 7x`?
  
• Question #efe36
  
• What is the oxidation number of the metal in `MnO_4^(-)`, and how do we represent its reduction to `Mn^(2+)`?
  
• Do polar solutes dissolve easily in water?
  
• What two things can cause a shift in the phase of matter?
  
• Question #4767a
  
• Question #fab0a