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In the molecule ClF5, chlorine creates five covalent bonds. Consequently, five of its seven valence electrons require being unpaired. Explain how many degenerate orbitals are required to contain seven electrons with five of them unpaired?
Is always a metal. Is called a catalyst. The magnesium acts as a reducing agent. How many electrons does each magnesium atom lose? Which family of elements in the periodic table contains the most powerful oxidizing agents?
Define a sample of Fe-59 initially registers 125 counts per second on a radiation counter. After 10 days the sample registers 107 counts per second. Define what is the half life in days of Fe-59
A 0.85g sample of commercial lye (containing NaOH and other inert ingredients) is dissolved in water and titrated with 37.00ml of 0.525 M HCl. What is the percent purity (mass of NaOH/mass of sample x 100) of the lye sample
The temperature changes from 25 degrees C to 29 degrees C. What is the enthalpy (ΔH) of the reaction? (use 4.184 J/g degrees C as the specific heat of water)
What is the empirical formula of compounds: ethyne (C2H2) and styrene (C8H8). Explain the relationship between ethyne and styrene's empirical formulas and their properties.
Consider the following reaction: NH4HS(s) NH3(g) + H2S(g) An equilibrium mixture of this reaction at a certain temperature was found to have [NH3]=.278M and [H2S]=.355M.
The Keq for the equilibrium below is 5.4 × 1013 at 480.0 °C. 2NO (g) + O2 (g) ? 2NO2 (g) What is the value of Keq at this temperature for the following reaction? 4NO (g) + 2O2 (g) ? 4NO2 (g)
a 5.00 ml sample of barium hydroxide is titrated to the phenolphthalein endpoint using hydrochloric acid. the five ml
Write balanced nuclear equations for (a.) the loss of an alpha particle by thorium- 230 and (b.) the fission of U- 235 to give Ba- 140, two neutrons, and another nucleus.
Calculate the equilibrium pressure of NO if 2.00 atm and 1.00 atm of O2 are initially placed in a 1.0L container at 440K and the final total pressure in the container
in a .1000 M NaOH solution, 20.76 mL of the NaOH solution were required t neturalize completely 13.15 mL of the malonic acid solution; what is the molarity of the malonic solution?
a certain mass of oxygen was collected over water when potassium chlorate was decomposed by heating. the volume of the
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