Suppose you added NaCN to pure water and measured the pH to be 11.15. What is the [H3O+]? Remember, pH = -log[H3O+]

Bibliography: Edexcel Past Papers

Question 4.4.2 Exercising has a positive impact on our heart, blood vessels and lungs. Explain how exercise can decrease the risk of heart disease. (2)

How many particles per formula unit will be produced when the covalent molecular compound glucose (C6H12O6) is dissolved in water?

Calculate the molality of a solution in which 39.02 g of FeCl3 (molar mass = 162.2 g mol-1) are dissolved in 1335 g of water.

3. In order for a crime to be considered a robbery, the elements which have to be established include the wrongful taking of personal property from the person or in the person’s presence against the person’s will by force or threat of force.a. Trueb. False

Question 5.5   Sometimes the DNA blueprint code becomes a bit mixed up or damaged. These tiny changes in the plan can result in living things changing. The green moth changed to a darker coloured one.   Click on the button below to open the picture of the moth.   Explain how this can be problem and an advantage. (4)

How are coordination complexes formed?

5. You should always assume the burglar has left the scene of the crime prior to your arrival.a. Trueb. False

What is the difference between regular covalent bonds and coordinate covalent bonds?