Study

CHEMICAL REACTIONS

  •   0%
  •  0     0     0

      Back   Restart
  • The original substances of a chemical reaction are called products. TRUE OR FALSE?
    FALSE. They are called reactants.
  • New products are always formed from a chemical reaction. TRUE OR FALSE?
    TRUE.
  • Complete this sentence: "Both, m_______ and f________ can oxidise producing different results. The product is r_______ ".
    1. metals/ 2. food/ 3. rust
  • Which chemical reaction produces LIGHT AND HEAT? a. OXIDATION b. FERMENTATION c. COMBUSTION
    c. COMBUSTION
  • Which chemical reaction is also known as BURNING? a. OXIDATION b. FERMENTATION c. COMBUSTION
    c. COMBUSTION
  • We can use simple separation methods, like distillation, to separate the products of a chemical reaction. TRUE OR FALSE?
    FALSE. The new product formed from a chemical reaction can only be separated again by another chemical reaction. Simple separation methods won't work.
  • What components are needed for combustion to take place? (three)
    Oxygen, energy, fuel.
  • Which chemical reaction DOES NOT NEED OXYGEN to occur? a. Oxidation b. Fermentation c. Combustion
    b. FERMENTATION
  • "Condensation forms on a glass on a hot day". HAS A CHEMICAL REACTION TAKEN PLACE?
    NO, IT HASN'T. This is a change of state (from gas to liquid).
  • Think about FERMENTATION and complete the sentence: "FUNGI produce a_______ and carbon dioxide. BACTERIA produce l_____ a_____ and carbon dioxide".
    1. alcohol/ 2. lactic acid
  • Oxygen is the new product formed by fermentation. TRUE OR FALSE?
    FALSE. Carbon Dioxide is the new product formed by fermentation.
  • Complete the sentence: "FERMENTATION is a chemical reaction which involves m____________ which transform s___________ into organic substances".
    1. microorgamisms/ 2. sugars
  • When we use fermentation to make bread or wine, do we use FUNGI or BACTERIA?
    FUNGI.
  • Which chemical reaction is used in order to PRESERVE FOOD? a. OXIDATION b. FERMENTATION c. COMBUSTION
    b. FERMENTATION
  • When we use fermentation to make yoghurt and cheese, do we use FUNGI or BACTERIA?
    BACTERIA.
  • Can you tell me an example of fuel?
    Wood/gas/oil
  • "When two liquids are mixed, a blue solid forms at the bottom". HAS A CHEMICAL REACTION TAKEN PLACE?
    YES, IT HAS. PRECIPITATE FORMATION is a very common sign of a chemical reaction.
  • Which chemical reaction can SALT SPEED UP? a. OXIDATION b. FERMENTATION c. COMBUSTION
    a. OXIDATION
  • "Bubbles form when vinegar and baking soda are mixed together". HAS A CHEMICAL REACTION TAKEN PLACE?
    YES, IT HAS. Some chemical reactions produce gas (GAS FORMATION).
  • "Ice cream melts in the sunshine". HAS A CHEMICAL REACTION TAKEN PLACE?
    NO, IT HASN'T. This is a change of state (from solid to liquid).
  • "A glow stick emits light when it is broken". HAS A CHEMICAL REACTION TAKEN PLACE?
    YES, IT HAS. There has been an ENERGY CHANGE (light energy).
  • "A glass jar feels warm after two cold substances are mixed together". HAS A CHEMICAL REACTION TAKEN PLACE?
    YES, IT HAS. There has been an ENERGY CHANGE (thermal energy).
  • "This metal has gone rusty". Rusty is the adjective we use to say that something has got rust. Can you define "RUST"?
    "RUST" is a reddish-brown substance that appears when oxidation takes place (it easily breaks apart and makes the original object useless).
    • Your experience on this site will be improved by allowing cookies.