radon

What does a radon level of 3pCi/L in a home mean. Should you be concerned about a radon exposure at this level? Why or Why not?

Chemicals in products...

Critique the following assertion made in the advertisement of a commercial product: "This product contains no chemicals." Please refer to the underlying chemical principles and not just your opinion. Thanks

Pesticides

Which concerns you more--pesticide residues on supermarket produce or second-hand cigarette smoke? Why? Please refer to the underlying chemical principles and not just your opinion. Thanks.

Chemistry of Solutes and Solutions

Quiz practice problems

Chemical Equilibrium

Please show all work, identify all parts of equations keep it simple (this is a first year cousre. Some TA's have gone way beyond first year in their answers) Please send in Word format. 1. The Reaction Quotient. The reaction CS2(g) + 4 H2(g)  CH4(g) + 2 H2S(g) has an equilibrium constant of 0.28 at 900°C. ...continues

Acids and Bases NOT FOR TA 104422!!

Please show all work and send answers in Word. 1. Conjugate Acid-Base Pairs.  Identify the conjugate acid-base pairs in each of the following reactions.  Label each species as an acid or a base. a. NH4+(aq) + CN-(aq)  NH3(aq) + HCN(aq) b. CH3COOH(aq) + F-(aq)  CH3COO-(aq) + HF(aq) c. ...continues

Acid-Base Equilibria

Please show all work and explain things simply--- I am NOT good with chemistry at all..... Also, please send answers in Word. 1. Determining Ka. What is the Ka value for a weak acid if a 0.0150-M solution has a pH of 2.67? 2. Calculations With Ka. What is the pH of a 0.250-M benzoic acid solution? 3. Polyp ...continues

Length of an edge of the PbSe unit cell

Clausthalite is a mineral composed of lead selenide (PbSe). The mineral adopts a NaCl-type structure. The density of PbSe at 25C is 8.27g/cm^3. Calculate the length of an edge of the PbSe unit cell in Angstroms.

Chemistry Practice Problem Set

Everything is already answered I just need to know if I am on the right track, please help I am really struggling with chemistry and I absolutly need to know how to do these problems correctly, so if I am wrong can you please tell me were my error is. ----------- Which of the following salts would give you the lowe ...continues

Acid Base Equilibria

Please show all work and remember this is a first year course. Chem is my weakest subject. Please send responsse in Word. Also, if you are not willing to show me the proper way to do these by showing the calculations and will only supply me with some notes tht I could read out of any textbook myself, please do not take th ...continues