A(n) ____ is a substance that cannot be reduced to a simpler substance by chemical means.
A. element
B. compound
C. molecule
D. atom
Answer: A
You might also like to view...
Do not use a _____ on the handle of a vise or it might break.
What will be an ideal response?
A gas, initially at T=500 K, undergoes a Joule-Thompson (constant enthalpy) expansion from P=10 atm to P=1 atm.
A) Prove that (dT/dP)H is equal to: (1/Cp)[T(dV/dT)P – V] (You may assume this expression is valid for parts B and C, even if you are unable to prove it.) B) Find an expression for (dV/dT)P for this gas, in terms of P, T and known constants, assuming it follows the equation of state: V = (RT/P) + aT2P2 For full credit your answer should be an algebraic equation—all derivatives should be evaluated. C) Assuming the heat capacity of the gas is constant at Cp=5R, and that ‘a’ is constant at 2x10-7 L mol-1K-2atm-2, find the final temperature of the gas.
Which are the leading livestock exports from the United States?
a. beef and pork c. poultry and pork b. beef and poultry d. All answers are correct.
What provisions should be made to prevent water from freezing during low temperature periods of operation for a hydronic heating system?
What will be an ideal response?