Questions asked by sanabil

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• How might the mass of copper product be affected by the following? Clearly explain the effect that each of these situations would have on the mass of the product.
  
• 100mL solution of NaCl in water used 2.9g of salt. The final concentration is 0.50 M. express the concentration as a mass/volume %. How do these values compare to the molarity? Why? Show all calculations
  
• What is the [OH-] concentration of NaOH solution with a pH of 9.4?
  
• What is the ph of a 100 ml solution containing 0.0040 g of HCl?
  
• Under SATP (not STP), magnesium was reacted with acid and 500 ml of hydrogen gas was collected over water. a) what is the vapour pressure of water? b) what is the pressure of the hydrogen gas? c) what amount of hydrogen was produced?
  
• PLEASE HELP WITH THIS PHYSICS QUESTION!!??
  
• HELP PLEASEEEE>??
  
• Physics question help?
  
• Equipment was originally worth for $12000 The equipment is expected to last 5 more years and have a salvage value of $3000 what is the deprecation expense after 3 months?
  
• Why DNA is able to direct its own synthesis?
  
• Write an equivalent expression for sin x/2 using compound angle formulas?