Answers created by David Y.

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• Question #06bb4
  
• How does friction affect Newton's second law?
  
• Question #57654
  
• Question #62776
  
• How can I calculate the displacement of multiple variables? For example what is the displacement of, 10m in 5.0s, then 16m south in 5.0s, then 14m north in 4.0s? In case it is needed, the average speed is 2.9 m/s for that problem.
  
• Question #7c91f
  
• Question #d9ef1
  
• Question #ab48f
  
• Why is acetone often used to extract fat rather than ethanol?
  
• Question #eead2
  
• Question #bde5e
  
• Why are equilibrium constants dimensionless?
  
• Do pi bonds change the shape of a molecule?
  
• What is radioactive dating?
  
• Question #16468
  
• Question #51925
  
• Question #51925
  
• Question #51925
  
• Question #d3c9f
  
• Question #d7ea6
  
• Question #3dc17
  
• Question #d7edd
  
• Question #ca3af
  
• Question #3c826
  
• Question #d3399
  
• Question #384ab
  
• Question #384cf
  
• How do you calculate enthalpy change?
  
• Question #fec06
  
• Buffer or no buffer? #"45 mL"# of #"0.60 M"# #"KF"# reacts with #"25 mL"# of #"0.60 M"# #"HClO"_4# to yield #"HF"# and #"KClO"_4#, all aqueous.
  
• Question #f7a6f
  
• How to calculate the first and second ionization energies of helium?
  
• 11. 135 g of aluminum (initially at #"400"^("o")"C"#) are mixed with an unknown mass of water (initially at #"25"^("o")"C"#). When thermal equilibrium is reached, the system has a temperature of #"80"^("o")"C"#. Find the mass of the water?
  
• Question #f49cc
  
• Can someone please explain how to find the amount of energy released in a chemical reaction? What formulas do I use and how do I use them?
  
• Question #198d0
  
• Question #2664b
  
• Question #100da
  
• Question #2e817
  
• Is this reaction likely to be spontaneous? 2Li(s) + 2H2O(g) ----> 2LiOH(s) + H2(g) ΔH = -222 kJ
  
• Question #08737
  
• Question #71344
  
• Question #889b0
  
• Question #16c0c
  
• What is the final temperature of water if it used 520 J from 52 degrees C?
  
• I did a Magnesium Oxide Lab.Magnesium often reacts with nitrogen in the air. If some of the magnesium had reacted with the nitrogen, would it make the % composition of ur sample higher or lower than it should be? Explain (Hint-Try a sample calculation).
  
• Question #81af3