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Exothermic reactions release heat, causing its temperature to fall. If the reaction is lessening the temperature of the object while releasing all the heat, then you know that the reaction is indeed exothermic. Hope this helps!
C. Convection currents in the air
Explanation:
Near the shore, winds tends to blow out towards the water at night and this is driven by convection currents in the air.
Convection occurs in fluids. Since we are dealing with wind, therefore, it is convection in air.
- At night, the air on land is cold and under high pressure.
- The shore area is able lose and gain heat very fast.
- At night, since the shore is cold, the air around is cold too.
- The ocean has high heat capacity and does not lose or gain heat easily.
- At night, it still retains come of its heat.
- This causes nearby winds to warm up, becomes less dense and rises.
- The wind here is moves towards the cold land
- The breeze on land moves outwards towards the ocean.
- This will then set up convection currents.
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Older trees can survive with the bark stripped from up to half the trunk diameter. If the bark is stripped all the way around the tree, it will die unless the damage can be repaired with bridge grafts.
Answer:
<h3>
moles of carbon dioxide=13.95mol</h3>
Explanation:
First wrie down the balance chemical reaction:
Combustion reaction: The reacion in which hydrocarbon is burnt in the presence of oxygen gas and it releases heat and this reaction exothermic because heat of cumbustion is negative.
eg. burning of methane
By using unitry method,
From the above balanced reaction it is clearly that,
from 1 mole of propane 3 moles of carbon dioxide is formed
there fore,
from 4.65 mole of propane 
moles of carbon dioxide will form
moles of carbon dioxide=13.95mol
