CHEMISTRY COMMUNITY

emilyharland

What is the difference between these two constants and what are they each describing in a reaction?

emilyharland

This question reads: the activation energy, in organic reaction is known to be 125 kJ•mol-1. Will this reaction occur at room temperature. Could someone help with this thanks!

emilyharland

Did you hear about the man who got cooled to absolute zero? He's 0K now.

emilyharland

This question says: The rate constant for the reaction A --> B is 25 min-1 at 298 K and 35 min-1 and 350 K. Calculate the value of the rate constant at 770 K, give your answer in min-1. I am having trouble figuring out how to set up this problem could someone help thanks!

emilyharland

On part A, how would we determine that the q of the water is the one that is negative in the equation qice=-qwater?

emilyharland

This problem states, balance the following skeletal equations by using oxidation and reduction half reactions. All the reactions take place in acidic solution. The reaction is Cl2(g) + S2O3 2-(aq) --> Cl- (aq)+ SO4 2- (aq). I understand how to get which agent is oxidizing and which one is reducing b...

emilyharland

This question states: Suppose that 50.0 g of H2O(l) at 20.0° C is mixed with 65.0g of H2O(l) at 50.0°C at constant atmospheric pressure in a thermally insulated vessel. Calculate ∆S and ∆Stot for the process. Could someone help me with this?

emilyharland

I find that UA session and TA office hours are extremely helpful!

emilyharland

This question asks what mass of propane C3H8(g) must be burned to supply 2580 kJ of heat? The standard enthalpy of combustion of propane at 298 K is -2220 kJ/mol. Since there is no change in temperature how would I go about solving this problem?

emilyharland

Problem 21 states: A piece of copper of mass 20.0 g at 100.0°C is placed in a vessel of negligible heat capacity but containing 50.7 g of water at 22.0°C. Calculate the final temperature of the water. Assume that no energy is lost to the surroundings. Could someone help me out with this problem in s...

emilyharland

Enthalpy is the heat flowing in or out of a system at a constant pressure that depends on the amount of substance present. Enthalpy will equal energy unless the reaction is performed at a very high pressure or there is a significant change in volume, which can be seen because the formula for enthalp...

emilyharland

A radical occurs when there are an odd number of valence electrons, so instead of a lone pair, there is just a single electron. For instance, in the hydroxide radical, there is a single atom where a lone pair would normally be.

emilyharland

There will be one root that is too big to subtract from the original concentration or partial pressure, so you would use the smaller one of the two.

emilyharland

p is a shorthand notation for -log that is written to simplify the equations

emilyharland

On question number 6, it asks what conditions favor SO2(g) production in the equation 2SO3(g) <-> 2SO2(g) + O2(g). I understand how increasing the temperature would favor the products but the other condition is low pressure. Wouldn't lowering the pressure cause the molecule to shift towards the reac...

emilyharland

I blew up my chemistry experiment... oxidants happen

emilyharland

In addition to the wavelengths of visie light I think we also should know the wavelengths of infrared and ultraviolet light and where they come in the spectra either before or after visible light.

emilyharland

I am wondering why Xe can have an expanded octet even though it is a noble gas with all its orbitals filled?

emilyharland

The brackets around a ionic lewis structure are meant to show that their is an overall charge on the entire molecule, not just certain elements within the molecule.

emilyharland

Yes, the answers in the workbook have the correct amount of significant figures!

emilyharland

You would be correct, this is due to the fact that the position and momentum of a particle are complementary properties, meaning if one property is known then the other cannot be known simultaneously. As your measurement for one property gets more accurate, the other measurement becomes less accurate.

emilyharland

When doing calculations, use as many sig figs as possible up until you have calculated your final answer, which should include the same amount of sig figs as the smallest numerical data being used. For instance if the smallest number in the original data has only 3 sig figs, then in your final answe...

CHEMISTRY COMMUNITY

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