Study

Semester 2

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  • Of all the mediums in which light travels the fastest
    Air
  • What are the primary colours of light?
    Red, Green and Blue
  • One evidence that supports the collision theory for the formation of the moon
    Moon is less dense than earth, Samples of rock from the moon show that its surface was once molten
  • Draw 2 how 2 sound waves must meet in order to reinforce
    constructive
  • Advantages of parallel circuit
    Each component can work independently
  • What is refraction?And why it happens
    bending of light, Change in direction due to change in speed when entering a different medium
  • What is the word equation for the reaction between zinc and sulphuric acid
    Zinc sulphate + hydrogen
  • Draw 2 sound waves must meet in order to cancel out each other
    destructive
  • Name of acid- Nitric Acid, what will be the name of salt formed by this.
    Salt Nitrate
  • State the law of reflection
    Angle of incidence = Angle of reflection
  • Red + Green
    yellow
  • Can zinc displace the copper in copper sulphate?
    Yes
  • Can silver displace the magnesium in magnesium sulphate?
    No
  • Can iron displace aluminium from aluminium oxide? Explain your answer
    No, Iron is least reactive that aluminium
  • Why would it be dangerous to prepare sodium chloride by reacting sodium with Hcl
    Both are highly reactive
  • Why does a red rose appear red
    All the colours are absorbed except red which reflects back to our eyes
  • Difference between resistor and a variable resistor
    Variable- you can control the resistance
  • higher the temperature higher the rate of reaction. Justify
    More temperature, more kinetic energy, more collision and more reaction
  • Which element are present in sulphuric acid? How many atoms of each atoms make up one particle of sulfuric acid?
    7 atoms
  • The metal lithium is missing from the reactivity list, suggest where it should be placed
    Most reactive
  • what is similar about the formula for Hcl and sodium chloride?
    Chlorine
  • What is law of conservation of mass
    Mass of the reactants will always be equal to the mass of the product
  • State ohms law
    V = IR
  • Where will you connect ammeter and a voltmeter in circuit
    Ammeter- Series, Voltmeter- Parallel
  • Platinum is a precious metal that is used for jewellery. Where in the list would you place platinum?
    Least reactive