Question

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what happens to the temperature of a block of ice when you put a bunsen burner underneath it? you might think that the temperature goes up smoothly, but thats not what happens. the graph of temperature against time is called a heating curve. lets look at the heating curve for water.
what state of matter would i be starting with?
the segment ab on the curve below represents this phase. in segment ab, the temperature is increasing/decreasing/staying the same (circle the correct answer). this means that heat is being absorbed/released (circle the correct answer).
heating curves
notice that, in general, the temperature goes up the longer the heating continues. however, there are two horizontal flat parts (segments bc and de) to the graph. these happen when there is a change of state. the plateaus are also called phase changes.
the first change of state (segment bc) is melting (changing from a solid to a liquid). the temperature stays the same while a substance melts.
for water, this temperature is 0°c because the melting point for water is 0°c.
over the course of this line segment, both liquid and solid exist in various ratios, starting at 100% solid and ending at 100% liquid.
label segment ab as its state of matter and if that is a temperature change (tc) or a phase change (pc). label segment bc as the phase change that occurs.
the segment of line from c to d would represent the ______________ state. label the cd segment with its state and if that is a temperature change (tc) or phase change (pc).
the second change of state (segment de) is boiling (changing from a liquid to a gas). the temperature stays the same while a substance boils. for water, this temperature is 100°c because the boiling point for water is 100°c.
over the course of this line segment, both liquid and gas exist in various ratios, starting at 100% liquid and ending at 100% gas.
label segment de with the phase change that occurs. note again, that the temperature is constant in this segment.
segment ef would represent the ______________ state. label the ef segment with its state and if that is a temperature change (tc) or a phase change (pc).
heating curves are taking in heat throughout the entire process. that means that they are ____________thermic. all of the phase changes on the heating curve are also ____________thermic.

Explanation:

• Empezamos con hielo, que es el estado sólido del agua.
• En el segmento AB, el hielo está absorbendo calor y su temperatura aumenta. Es un cambio de temperatura (TC) y el estado es sólido.
• En BC, el hielo se derrite, un cambio de fase (PC) de sólido a líquido.
• CD representa el estado líquido, con un cambio de temperatura (TC) ya que el agua líquida está absorbendo calor y su temperatura aumenta.
• DE es la ebullición, un cambio de fase (PC) de líquido a gas.
• EF representa el estado gaseoso, con un cambio de temperatura (TC) ya que el vapor de agua está absorbendo más calor y su temperatura aumenta.
• Los procesos de absorción de calor son endotérmicos.

Answer:

• ¿Qué estado de materia se empieza? Sólido.
• Segmento AB: Estado: Sólido, TC.
• Segmento BC: Cambio de fase: Derretimiento.
• Segmento CD: Estado: Líquido, TC.
• Segmento DE: Cambio de fase: Ebullición.
• Segmento EF: Estado: Gaseoso, TC.
• Heating curves son endotérmicos. Las phase changes en el heating curve también son endotérmicas.