Questions asked by tali shepard

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• The specific heat of water is 4.184 J/g times celsius degree. How much heat is required to raise the temperature of 5.0g of water by 3.0 C degrees?
  
• When a sample of a gas is kept at constant pressure the volume and Kelvin temperature of the gas are?
  
• Which of the following is not equivalent to the remaining three?
  
• The density of a balloon will decrease if?
  
• What are two ways you can achieve lower density in a gas? Explain Why
  
• How can some substances (water, for example) act in some reactions as an acid and in other reactions as a base?
  
• A 1.0 M solution of a weak acid, HB, has an [H3O+] equal to 0.025 M. Find the value of Ka. (HB + H2O --> B- + H3O+) Can anyone help?
  
• The #K_a# for #HCOOH# is #1.78*10^-4#. What would be the expected #[H_3O^+]# for a 1.0 M water solution of #HCOOH#?
  
• If 15% of a O.1 M solution of a weak acid dissociates into H+ and A- ions, what is the concentration of H3O+? (HA + H2O --> H3O+ + A-) ?
  
• What is meant by the term pH? Explain the pH scale. Why is the pH of pure water not zero?