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Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d
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Which of the following best describes the circuit shown below?
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There are 3 ways heat can be transferred: through solids, called , through liquids and gases , called , and through electromagnetic waves, called
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In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.
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Which star has a luminosity of 01...
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