Chemical Engineering

Recent Answers

2011-12-31 Careers: Engineering & Electrical Trades - VOLTAGE PRESENCE/ABSENCE SENSOR:

You could use a simple voltage divider with the 110VDC going through a 100k resistor, then through a 4.75k resistor to common.  The point between the two resistors (we'll call this the voltage tap) will

2011-12-31 Careers: Chemistry - Extraction and ethanol:

First: Ethanol extraction has been happening with humans since the dawn of the use of oils and dyes.  Ethanol -CAN- be a natural product, depending on the source.  And yes, the amount of alcohol remaining

2011-12-24 Careers: Chemistry - Solubility Product:

Sorry for the delay: It is holiday season and I was away with friends and family.    I am no expert at heavy metal determination, but I know that Yttrium has been detected at low levels for a long time

2011-12-08 Thermodynamics - Entalphy:

I'm trying to convince you that you can only measure differences in both enthalpy and potential energy.  In the equation PE = mgh, PE changes as a function of h.  If you have an object setting on the floor

2011-12-07 Thermodynamics - Entalphy:

Total enthalpy of a system cannot be measured.  Only differences in enthalpy can be measured.  Therefore, you have to have some starting point and that is defined as zero for elements.  It's like electrical