Afarmer wants to determine if a new fertilizer gives a better crop yeild than her old fertilizer. she spreads the old fertilizer in field a, which crop had a brand new irrigation system. she spreads the new fertilizer in field b, which has a irrigation system that will be repaired next season. at the end of growing season, field a has a better yeild. the farmer determines that her old fertilizer is the better fertilizer. this an example of which of the following a. cultural bias b. personal bias c. data presentation error d. experimental bias

D. experimental bias

Explanation:

An experimental bias is the condition in which the experimenter manipulate the experimental procedure, equipment and even the results so as to obtain the desired outcome.

The given situation is an example of experimental bias this is because of the fact that field A was supplied with old fertilizers and brand new irrigation system but field B was supplied with new fertilizers and irrigation system which will be repaired in next season. Hence, a experimental bias is done so as to show that the old fertilizer is better than the new one.    

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles