written reposes Drew visits a coal-fired power plant with his class. He learns how the power plant works: 1. Coal is delivered to the power plant. 2. The coal is ground to a powder and mixed with air. 3. The air and coal mixture is burned at very high temperatures in the firebox of a boiler to produce heat energy. 4. Water piped into the boiler is heated and becomes steam under high pressure. 5. The high-pressured steam spins a turbine (blades that spin under pressure, similar to a propeller). 6. The turbine is connected to a generator, where magnets turn inside of wire coils to produce electricity. Drew decides that the function of a coal-fired power plant is similar to the function of a part of a cell. a. Identify the cell part that functions in a similar way to a coal-fired power plant. b. Describe how the coal-fired power plant and the cell part identified in part (a) are similar in function.

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

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