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What are some examples of 7a elements? How many valence electrons do these elements have? Are these elements considered reactive? What are some practical uses of some group 7a elements?
suppose that 0.90 grams of water condenses on a 75.0 grams of block of iron that is initially at 20 degrees celcius.
Determine the molar absorptivity of the acidic form of bromocresol green at 445 nm and at 615 nm. Given: Stock soln of bromoscresol green= 80.0 mg/L Molar Mass= 698.0 g/mol ?(445nm)=A445/[BG]
The first ionization energy of magnesium is 738 kJ/mol, the second ionization energy of magnesium is 1451 kJ/mol, and the electron affinity for chlorine is -349 kJ/mol.
Are the following processes exothermic or endothermic. the combustion of gasoline in a car engine water condensing on cold pipe CO2(s) CO2(g) F2 2F(g)
Use the Rydberg equation (1 / wavelength = (1/n(smallest)^2 - 1/n(largest)^2) to calculate the wavelength of this transition in nanometers (nm) and to three significant figures.
Which reactant is in excess from the reaction of 35.0 g of hydrogen with 276 g of oxygen to form water
The oil is burned with 20.0% excess air, based on complete combustion of the carbon to CO2, the hydrogen to H2O, and the sulfur to SO2. The oil is burned completely, but 8% of the carbon forms CO. Calculate the molar composition of the stack gas.
Calculate the [CH3CO2H] ionized in solution for 0.1M acetic acid knowing that ph= 2.9 [H+]= 1.26 x 10^-3 M , [OH-]= 7.94 x 10^-12 M
An electrochemical cell is constructed with a zinc metal anode in contact with a 0.0520M solution of zinc(II) nitrate and a silver cathode in contact with a 0.00420M solution of silver(I) nitrate
Identify the strongest attractive forces between molecules of each of the following: a) O2; b) SiH4; c) CH3Cl; d) H2O2; e) Ne
At 20 degrees C the vapor pressure of pure methanol (CH3OH) is 89.0 torr and of pure water (H2O) is 17.5 torr. A solution of methanol and water has a total vapor pressure of 52.9 torr at 20 degrees C.
If the barometeric pressure was 0.98 atm when the mercury level in an open-end manometer connected to a flask of gas was 177 mmHg higher on the side open to the atmosphere than on the flask side
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