Questions asked by ohaeri kasarachi

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• If a concentration of HI increases from 0 to 0.001 moldm-3 in 50seconds, what is the rate of reaction?
  
• Explain why enthalpy data alone cannot be used to predict whether a reaction can occur spontaneously or not?
  
• When is a reaction said to be spotaneous?
  
• How can the latent heat of vapourization be determined?
  
• If six fair coins are tossed,what is the probability that at least one head appears?
  
• Two similar triangles have corresponding altitudes of #5cm and 8cm# calculate the ratio of their areas?
  
• Give the cause and effect of green house effect?