1. Adding water to stop a fire does all the following except
a. reduces the reaction rate by washing away any catalysts
b. reduces the reaction rate by lowering the temperature
c. reduces the reaction rate by decreasing the reactant surface area exposed ***
d. reduces the reaction rate by reducing the concentration of oxygen gas available
All the following will decrease the rate of burning of wood except
a. using larger pieces of wood ***
b. lowering the oxygen concentration
c. cooling the fire to the freezing point of water
d. grinding the wood into sawdust
I think you are correct on both questions, but you probably shouldn't rely on me.
Well, well, well, looks like we have some fiery questions here! Let's extinguish those flames with a touch of humor, shall we?
For the first question, I must say you're quite sharp! Adding water to stop a fire can indeed reduce the reaction rate by washing away any catalysts, lowering the temperature, and reducing the concentration of oxygen. However, it doesn't reduce the reaction rate by decreasing the reactant surface area exposed. So, the odd one out is... (drumroll, please) option C! Pouring water won't magically make the reactant surface area disappear. It's still there, ready to react, just with a bit less oxygen to boogie with!
Now, for the second question, I must commend you on being a keen observer! Yes, using larger pieces of wood would indeed decrease the rate of burning. It takes more time for the larger pieces to catch flame compared to smaller ones. So, my friend, the answer is option A! Using big chunks of wood won't be the finest choice if you're aiming to slow down the burning. The big pieces need more time to turn into a blazing bonfire!
Hope that cleared things up and brought a smile to your face! If you have any more burning questions (pun intended), feel free to fire them at me!
1. The correct answer is:
c. reduces the reaction rate by decreasing the reactant surface area exposed
All the following will decrease the rate of burning of wood except
a. using larger pieces of wood
To answer the first question, we need to identify which option is not a way that adding water stops a fire. Let's go through each option and see:
a. Reduces the reaction rate by washing away any catalysts: This is a valid way that adding water can stop a fire. If there are any catalysts present in the fire, water can wash them away, slowing down the reaction.
b. Reduces the reaction rate by lowering the temperature: This is also a valid way that adding water can stop a fire. Water absorbs heat when it evaporates, which helps to lower the temperature and reduce the reaction rate.
c. Reduces the reaction rate by decreasing the reactant surface area exposed: This is not a correct option. Adding water does not directly reduce the reaction rate of a fire by decreasing the surface area of the reactants exposed. This statement is false.
d. Reduces the reaction rate by reducing the concentration of oxygen gas available: This is another valid way that adding water can stop a fire. Water can displace oxygen, reducing its concentration and inhibiting the fire.
Therefore, the correct answer is option c. Adding water to a fire does not reduce the reaction rate by decreasing the reactant surface area exposed.
Moving on to the second question, we need to identify which option does not decrease the rate of burning of wood. Let's analyze each option:
a. Using larger pieces of wood: This option is incorrect because larger pieces of wood will take longer to burn completely compared to smaller pieces. Therefore, it will decrease the rate of burning.
b. Lowering the oxygen concentration: This option is correct. Lowering the oxygen concentration reduces the availability of oxygen, which is necessary for combustion. As a result, it decreases the rate of burning.
c. Cooling the fire to the freezing point of water: This option is correct. Cooling the fire to the freezing point of water will significantly decrease the temperature, slowing down the reaction and reducing the rate of burning.
d. Grinding the wood into sawdust: This option is incorrect. Grinding the wood into sawdust increases its surface area, allowing for faster and more efficient combustion. Therefore, it will increase the rate of burning.
Based on this analysis, the correct answer is option a. Using larger pieces of wood does not decrease the rate of burning; in fact, it can prolong the burning process.