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(a) Moseley's experiments on X-rays emitted from atoms led to the concept of atomic numbers Where exactly do these X-rays come from? Draw an energy-level diagram to explain.
(b) Why are chemical and physical properties of the elements more closely related to atomic number than they are to atomic weight?
An empty Erlenmeyer flask weighs 246.3 g. When filled with water (d = 1.00 g/cm3), the flask and its contents weigh 495.0 g. (a) What is the flask's volume? (b) How much does the flask weigh when filled with chloroform (d = 1.48 g/cm3)
you need 100.00 ml of h2o and 5.00 ml of liquid plant food to make a solution for your plants. you forgot to bring a
Imagine that you have a 6.50 L gas tank and a 4.00 L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 115 atm
FeCl3 and Mg3(PO4) to give FePO4 and MgCl2 I need to know what are the : Molecular Equation? Ionic Eq? Net Ionic Eq? What is the name of this type of reaction. Which ions are spectator ions
Calculate the concentration of IO3 in a 7.56 mM Pb(NO3)2 solution saturated with Pb(IO3)2. The Ksp of Pb(IO3)2 is 2.5x10^-13. assume that Pb(IO3)2 is a negligible source of Pb compared to Pb(NO3)2.
16.2g iron(III) chloride reacts with 3.33g NH2OH in acid to produced N2O gas. a) Write a balanced, net ionic equation.
Determine the electron geometry, molecular geometry, and idealized bond angles for each of the following molecules. CF4
The Born-Haber cycle is a series of steps that represent the formation of an ionic compound from a metal and a nonmetal. For example, the steps in a Born-Haber cycle for the formation of NaCl(s) consist of sublimation of the metal Na atom
how would the molarity be affected by the followingcircumstances i.e. would it be higher than the true value lowerthan
Write the expression for Kc for the following reactions. In each case indicate whether the reaction is homogenous or heterogeneous. a) 3NO(g) ?? N2O(g) + NO(g)
Which aqueous solution will have the highest total number of moles of ions in the solution. The answer is 100mL 3M calcium nitrate. Why is it not 100mL 4M glucose (C6H12O6), 100mL 1M aluminum fluoride, or 100 mL 2M calcium sulfide
a 493 ml sample of solution contains 33.2 g of cacl2. calculate the molar concentration of cl in this
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