Which feature of a heating curve indicates a change of state? an upward sloping line a downward sloping line a horizontal line a curved line

The heating curve

The curve is a graphical presentation of the phase of the transition of the substance as heat is added to it. The plateau shows us the mark in the changes in the heat of the substance. The rising temperature stays constant during the phase.

Hence the answer is a horizontal line.

Thus the option C is correct.

Learn more about the heating curve

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explanation:

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two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.