Just a few questions:
1. Explain the following observations in terms of the behaviour of particles:
a. There have been many explosions in coal mines. (is this because there is more pressure because of a confined space, so your reactions proceed faster because they collide often?)
c. Bushfires often start during lightning storms (It has something to do with energy, I think...)
d. Iron anchors from shipwrecks can show little corrosion after years in the sea (Low temp?)
e. A burning match is used to light a candle, but the candle continues to burn when the match is extinguished.
2.How would you speed up the rates of these reactions? Explain why the methods you suggested produce an increase in the reaction rate.
a. Wood on a camp fire was burning. (Would adding more wood be an answer, because you are adding more reactant?)
b. Bathroom tiles were being cleaned
c. A cake was baking.
d. A tomato plant was growing.
3. Decide, giving reasons for your answers, whether the following processes are endothermic or exothermic:
a. Recharging of a car battery
b. decomposition of plants in a compost heap.
4. Hydrogen reacts explosively with oxygen to form water. Explain how the energy changes during bond-breaking and bond-forming affect the energy change for this reaction.
5. The combustion of butane gas in protable stoves can be represented by the equation:
2C4H10(g) +13O2(g) ---> 8CO2(g) + 10H20(l); delta H= -5772kJ mol^-1
Draw an energy level diagram/ energy profile for the reaction (which I've done)
Then it says: Describe how your diagram would change for the equation: C4H10(g) + 13/2 O2(g) ---> 4CO2(g) + 5H20(l)
I don't know, how would the energy of the reactants vs. products change when the no. moles are halved?
6. Account for the following observations with reference to the collision model of particle behaviour:
a. A bottle of find aluminium powder has a caution sticker warning that it is 'highly flammable, dust explosion possible.'
7 Explain why surface properties are important to the operation of catalysts. Many industrial catalysts are made into porous pellets. What is the reason for this?
:wave:
1. Explain the following observations in terms of the behaviour of particles:
a. There have been many explosions in coal mines. (is this because there is more pressure because of a confined space, so your reactions proceed faster because they collide often?)
c. Bushfires often start during lightning storms (It has something to do with energy, I think...)
d. Iron anchors from shipwrecks can show little corrosion after years in the sea (Low temp?)
e. A burning match is used to light a candle, but the candle continues to burn when the match is extinguished.
2.How would you speed up the rates of these reactions? Explain why the methods you suggested produce an increase in the reaction rate.
a. Wood on a camp fire was burning. (Would adding more wood be an answer, because you are adding more reactant?)
b. Bathroom tiles were being cleaned
c. A cake was baking.
d. A tomato plant was growing.
3. Decide, giving reasons for your answers, whether the following processes are endothermic or exothermic:
a. Recharging of a car battery
b. decomposition of plants in a compost heap.
4. Hydrogen reacts explosively with oxygen to form water. Explain how the energy changes during bond-breaking and bond-forming affect the energy change for this reaction.
5. The combustion of butane gas in protable stoves can be represented by the equation:
2C4H10(g) +13O2(g) ---> 8CO2(g) + 10H20(l); delta H= -5772kJ mol^-1
Draw an energy level diagram/ energy profile for the reaction (which I've done)
Then it says: Describe how your diagram would change for the equation: C4H10(g) + 13/2 O2(g) ---> 4CO2(g) + 5H20(l)
I don't know, how would the energy of the reactants vs. products change when the no. moles are halved?
6. Account for the following observations with reference to the collision model of particle behaviour:
a. A bottle of find aluminium powder has a caution sticker warning that it is 'highly flammable, dust explosion possible.'
7 Explain why surface properties are important to the operation of catalysts. Many industrial catalysts are made into porous pellets. What is the reason for this?
:wave:
