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What is the balanced cell reaction for the following echem cell set-up? Pt(s) / PbO2(s) / Pb(NO3)2, HNO3 // Cr(NO3)3 / Cr(s)
the density of pure silver is 10.5 gcm3 at 20degc. if 6.17 g of pure silver pellets is added to a graduated cylinder
Draw a Lewis structure for each molecule and determine its molecular geometry. What kind of intermolecular forces are present in each substance?
If a raindrop weighs 57 mg on average and 5.1 X 10^5 raindrops fall on a lawn every minute, what mass of rain falls (in kg) on the lawn in 1.5 hours?
Computational chemistry-----What two predominant effects govern most chemical reactions and properties. What are the two major types of computational approaches used to model chemicals
A 4.80 g nugget of pure gold absorbed 279 J of heat. What was the final temperature of the gold if the initial temperature was 22.0°C? The specific heat of gold is 0.129 J/(g·°C).
Calculate the work of expansion accompanying the complete combustion of 1.0g of glucose to carbon dioxide and (a) liquid water, (b) water vapour at 20 degrees Celsius when the external pressure is 1 atm
The vapor pressure of pure ethanol is 56 torr. if a solution prepared from 560.0 g of methanol and 210.0 g of ethanol has a vapor pressure of .31 atm over the soultion.
If a few drops of water on the outside of the hot water syringe used to dispense the 5.00 mL sample into the calorimeter well for the Kcal determination fell into the well
Enter balanced molecular, ionic, and net ionic equations for the following pairs of reactants. If all ions cancel, indicate that no reaction (N.R.) takes place.
As a chemist for an agricultural products company, you have just developed a new herbicide,"Herbigon," that you think has the potential to kill weeds effectively. A sparingly soluble salt, Herbigon is dissolved in 1 Macetic acid for technical reas..
A water sample is suspected to be contaminated by iron (III) ions. How could you determine if the sample is really contaminated
Assuming levels of atmospheric CO2 are 390 ppm CO2, what is the pH of rainwater in equilibrium with the atmosphere for the pre-industrial atmospheric CO2 concentration of 280 ppm,v
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