Chemistry

Subdecks (6)

Cards (88)

    1. what is the purpose of an indicator in a chemical experiment
        to show different colors in acids and bases
  • 2. What is used in ' making the red cabbage indicator ' to grind the cabbage
           Pestle and mortar
  • 3. What is the color of the red cabbage indicator when in contact with sodium hydroxide
          purple
  • 4. why was the crushed cabbage heated with water in the experiment
        To extract the colors
  • 5. What effect would curning red cabbage indicator yellow have on universal indicator
    Turn it red
  • 6. What is neutralization
        A. reaction between acids and alkalis
  • 7. what is the word equation for neutralisation
        Base + acid = water + salt
  • 8. in a neutralization reaction what results from the reaction between acids and alkalis
       Salt and water
  • 9. What % of oxygen is in the air
       20-21%
  • 10. What is the general word equation for the determination of oxygen using copper metal
               Copper + oxygen = copper oxide
  • 11. how is oxygen removed from the air in the experiment to determine its percentage
              by passing over copper metal
  • 12. what is the main residual gas after oxygen removes in the experiment
         nitrogen
  • 13. what change in appearance does copper undergo during the experiment to
    Brown to Black
  • 14. what type of change its decomposition of hydrogen peroxide
        chemical
  • 15. what gas is produced by the decomposition of hydrogen peroxide
         oxygen
  • 16. what is the purpose of the black solid compound in the decomposition of hydrogen peroxide
                  to speed up the reaction
  • 17.  what color is oxygen
            colorless
  • 18. what is the symbol for oxygen
    O
  • 19. which gas is the. major part of air
          nitrogen
  • 20. Is decomposition a physical or chemical change
    chemical
  • 21. what common name do we give to the oxide of hydrogen
    water
  • 22. what do we use to measure the pH of solutions
    universal indicator
  • 23. what is the color of oxygen
    colorless
  • 24. what is the test for oxygen
    re-lights a glowing splint
  • 25. what is the test for co2
    limewater turns cloudy