Chem

• Explain how electricity is conducted in metals?

  -Giant structure

  -Made up of atoms

  -With delocalised electrons

  -so electrons can move through the metals
• Describe how the structure of an alloy is different from the structure of a pure metal.

  -An alloy has different sized atoms

  -This distorts the layers
• Nitinol is an alloy used in dental braces. Why is Nitinol used in dental braces?

  Can return to it's original shape.
• What does malleable mean?

  Capable of being shaped or molded.
• Which electrode has the halide rule?

  The anode
• Which electrode has the reactivity rule?

  The cathode(-)
• What gas is produced in the anode when there is no halide ion?

  Oxygen gas
• What gas is produced in the cathode when the metal is more reactive than hydrogen?

  Hydrogen gas
• What will the products be in electrolysis of a molten solution?

  Only the reactants will be products
• What is the test for hydrogen

  A lighted splint near the test tube and it creates a squeaky pop sound
• What is the test for an alkene?

  Bromine water test. From orange to colourless}
• Test for CO2

   reacts with limewater solution to produce a white precipitate of calcium carbonate
• Test for oxygen

   If oxygen is present in a test tube, a glowing splint relights when it is held inside
• Test for Chlorine

  Chlorine is an acidic gas that also acts as a bleach. Damp litmus paper is bleached white when it is placed in chlorine.