A study was created to test the effects of fear in children. The hypothesis of the experimenters was that if babies were exposed to fuzzy bunnies and at the same time a
loud cymbal was struck close behind them, then that child would be afraid of all fuzzy
things. Another group of children would be exposed to bunnies without any loud noises.
The study was carried out as planned and as a result, hundreds of young children
developed fear of all cute furry bunny rabbits.
a. Responding/Dependent Variable:
b. Control Group:
c. Manipulated/Independent Variable:
d. Treatment/ Experimental Group:

gas

explanation:

smoke is the matter of a gas

a is the correct answer

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol