The correct answer is: [C]: "Br" {"bromine"} .
_______________________________________________________
Answer:
Because they are electrical conductors because their delocalized electrons carry electrical charge through the metal. they are good conductors of thermal energy because their delocalized electrons transfer energy.
I hope it helps.
Answer: The correct answer is option d.
Explanation: Energy stored into gasoline is converted into another form of energy. This was very well explained on the basis of Law of conservation of energy. This law states that energy is conserved in the system which means that energy is converted from one form to another form.
The energy stored into gasoline is converted into mechanical energy which helps the car to move and some of the energy is lost in the form of heat.
Hence, the correct answer is Option d.
Electrons are released, causing a flow of electrical current,<span>when sunlight strikes a photovoltaic cell.</span>
69. The student's skin was obviously warmer than the initial temperature of the bracelet. According to the second law of thermodynamics, heat transfers from a higher temperature to a lower temperature hence heat transfers from the student's skin to the bracelet warming up the bracelet.
70. moles of copper=mass of copper/molar mass of copper
=30.1g/(63.55g/mol)= 0.4736 moles Cu
71. Delta H( heat released) = mCp(deltaT) = 30.1g(0.385 J/gK)(33-19)K = 162.23J
72. Copper is chemically less active than iron.
