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If a second-period diatomic molecule has 4 electrons in its valence shell (total of 2s and 2p electrons), what is the predicted bond order of the molecule?
the element europium exists in nature as two isotopes eu-151 has a mass of 150.9209 amu and eu-153 has a mass of
What wavelength radiation (nm) must be used to eject electrons from chromium metal with a velocity of 1.50 x 10^6 m/s? The ionization energu of chromium metal is 7.00 x 10^-19 J
100 mL of 0.200 M HCl is titrated with 0.250 M NaOH .What is the pH of the solution at the equivalence point?Express the pH numerically.
when a pure sample of tert-butyl bromide is analyzed by gas chromatography two components are usually observed. one of
Write a balanced net ionic equation for the neutralization of equal molar amounts of nitric acid and methyl amine (CH3NH2). Indicate whether the pH after neutralization is greater than, equal to, or less than 7.
Every measurement has a measurement uncertainty. Discuss how precise and accurate measurement can be achieved in spite of the inherent measurement uncertainty. You could use either of the two options given below.
when 5.56 mg of terephthalic acid are burned completey in excess oxygen 11.78mg of carbon dioxide and 1.81 mg of water
Calculate the pH of a solution containing 0.085 M nitrous acid (HNO2; Ka= 4.4 × 10-4) and 0.10 M potassium nitrite (KNO2).
calculate the number of moles of sodium carbonate present in a mixture of sodium bicarbonate sodium carbonate and a
a student sets up two reactions. reaction 1 uses 0.210moll of reactant and reaction 2 uses 0.550moll of reactant. how
What is the density (in grams per liter) of a gas mixture that contains 26.0 % F_2 and 74.0 % He by volume at 743 mm Hg and 28.5 C?
Calculate the standard cell potential at 25 C for the reaction X(s)+2Y+(aq)?X2+(aq)+2Y(s) where ?H? = -651kJ and S = -371J/K.
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