Percentage error? B
1. a.
What are some limitations to your direct observations of
your environment?
b. Give an example of an observation that could be made with-
out using an instrument, but that would be improved by us-
ing one.
c. Give an example of an observation that could not be made
without the use of an instrument.
2. Give an example, preferably from your own experience, of how a
group of observations led to an inference.
3. a. List two factors that can affect the accuracy of a measure-
ment and explain how you would attempt to control each of
them.
b. Explain how a series of measurements could be precise, but
not accurate.

looks like the answer is     c     to me!

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.