The tacky feel of the surface of odorless acrylic nail indicates the nail are:
What will be an ideal response?
Dry
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Methane, propane, and butane are commonly found in confined spaces and pose a safety hazard because they are _____.
a. inert gases b. compressed gases c. liquefied gases d. flammable gases
What is a topographic survey?
What will be an ideal response?
Define erosion
What will be an ideal response?
You are asked to calculate ?H when 0.1 kg of steam is heated at a constant pressure of 0.1 MPa from 373.15 K to 423.15 K. You remember learning that the heat capacity of water is about 4.19 kJ/kg•K, so you multiply 0.1 kg by 50 K by 4.19 kJ/kg•K and get an answer of 20,950 joules. Which of the following is the best assessment of your answer?
A. Your calculation is accurate, but you should round the answer to 21,000 joules, since your heat capacity only had three significant figures and 20,950 joules has four. B. This is a reasonable estimate of ?H, but it would have been more accurate to use the data in the steam tables than to use MCP?T. C. This is a reasonable estimate of ?H, but it assumes CP is constant with respect to temperature. You can get a more accurate answer by accounting for the temperature dependence of CP. D. This is not a reasonable estimate of ?H. 4.19 kJ/kg•K is a heat capacity of liquid water and you cannot assume water vapor has the same heat capacity. E. This is not a reasonable estimate of ?H. You should have used CP* = (5/2)R.