Homework Help: Chemistry

Posted by John on Thursday, March 4, 2010 at 2:57am.

Can someone please check my work?

Which of the four factors affecting reaction rate is most important in each exampel below? Choose from among concentration, temperature, surface area, and catalyst.

a. Extra dish soap is added to help cut the grease when washing a frying pan.
*concentration*

b. Firewood is chopped up into kindling to help start a fire.
*surface area*

c. A lighted match is brought near a candlewick in order to light the candle.
*temperature*

d. Lemon juice is rubbed on an iron sink to help remove rust.
*catalyst*

e. The accelerator pedal in a car is pressed, resulting in a faster consumption of fuel in the engine.
*catalyst*

f. The reaction of oxygen with sucrose in humean cells takes place in the presence of an enzyme.
*catalyst*

g. In order to release the fragrance of garlic when frying it in oil, the garlic is crushed and ground.
*surface area*

h. A mild skin disinfectant containing hydrogen peroxide is prepared in a 1 percent solution, while a stronger formulation is prepared in a 3 percent solution.
*concentration*

Are my answers correct? If not please correct me.

Chemistry - DrBob222, Thursday, March 4, 2010 at 3:36pm
I would have given different answers to d and e. I agree with the others.
d. Lemon juice removes the iron stain by forming a complex of iron with citric acid in the juice. Therefore, I would have answered concentration. Under the right conditions, temprature could play a role, also. Generally, however, one can't light a match under the sink to heat it up BUT we can run hot water over the stain for a period of time to make it warmer. And I've done that to make it easier to scrub the sink clean.
e.Pushing the gas pedal ADDS more gas to the engine and that makes the engine run faster which results in a faster speed. I would have chosen concentration.

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