Chemical Reactions

• How do we know when a chemical reaction is happening?


  Change in colour, change in energy, gas being produced or precipitate is produced
• what happens during every chemical reaction?


  there is always one or more new substances produced
• how would you test for hydrogen?


  lit splint held at the end of the test tube
• what is the result of testing hydrogen?

  gas burns with a pop
• how would you test for oxygen?


  glowing splint
• what is the result when testing oxygen?


  relights a glowing splint
• how would you test for carbon dioxide?


  limewater
• what is the result when testing carbon dioxide?

  limewater turns cloudy or chalky
• what advantage is there in using an inverted measuring cylinder or a gas syringe?


  the volume of gas can be measured
• 7 examples of everyday chemical reactions

  photosynthesis, respiration, cooking food, burning fuel, fermentation, making plastics, neutralising stomach acid
• what is an element?


  a substance which is made up of only one atom
• how can you classify elements?


  solid, liquid, gas, metal or non metal
• what is a row called in the periodic table?


  period
• what is a column called in the periodic table?


  group
• what special property is true of the noble gases?


  they are all inert or unreactive
• what is a compound?


  a substance made when two or more elements chemically join together
• what does compound names end in?


  ide
• if the compound has oxygen in it what does it end in?


  ate or ite
• what is a word equation?

  a short way of showing reactants and products involved in a chemical reaction