chemistry paper 1 wrong questions

• Describe a method to find the position of an unknown metal in the reactivity series

  Add unknown metal to solution. Measure temperature change. Place metals in order of temperature change. Control variables: use same mass of metal, use same volume of solution
• Why is pipette used to measure the acid and a Burette used to measure alkali

  pipette measures fixed volume burette measures variable volume
• Why can an acid be strong and dilute?

  Small amount of acid produced per unit volume but strong because completely ionise in aqueous solutions
• What is a diatomic element?

  molecules that consists of two atoms
• What did Ernest Rutherford experiments show?

  Most of alpha particles based straight through gold foil so atom is mostly empty space. Number of alpha particles deflected decreased and angle of deflection increased
• What Is the definition of a proton in relation to the nucleus and its charge?

  positive charge of nucleus is divided into smaller particle each particle has same amount of positive charge
• On a heating graph if the line is flat what does this show?

  temperature not increasing because particles using energy to break out of fixed position
• Why do alkali metals float on water?

  less dense than water
• Why do alkali metals fizz when they react with water?

  hydrogen produced
• Why is chlorine added to tap water?

  sterilise it