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Heat and Temperature: Mastery Test
2
Select the correct answer.
Given the law of conservation of energy, what happens when a 200°C iron bar is placed in thermal contact with a 30°C block of wood?
OA
OB.
Energy leaves the iron bar and enters the wood until the temperatures are equal.
Energy leaves the wood and enters the iron bar until the temperatures are equal.
All the energy from the Iron bar is transferred to the wood.
C.
OD
All the energy from the wood is transferred to the iron bar.
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Astudent made the lewis dot diagram of a compound as shown. mg is written with two dots shown on its top. an o is written on each side of mg. each o has six dots around it. an arrow is shown from one dot on mg toward the vacant space around the o on the right. another arrow is shown from the other dot on mg toward the vacant space around the o on the left. the title of the art is students lewis dot model. what is the error in the lewis dot diagram? an o atom should transfer all its six electrons to mg because the formula is mgo. both electrons of mg should be transferred to one o atom because the formula is mgo. the electrons should be transferred from each o atom to mg because mg has fewer electrons. the number of dots around mg should be four because it has to transfer two electrons to each o.