Question

A piece of plastic (sample Q), was heated at a constant rate. After 20 minutes of adding heat, the plastic melted. When an identical piece of plastic (sample R), was heated with twice as much heat per minute, the plastic melted in 10 minutes. How do the melting points of the two pieces of plastic compare?

A. The melting point of sample R is double that of sample Q.
B. The melting points of sample Q and sample R are the same.
C. The melting point of sample R is slightly higher than sample Q's.
D. The melting point of sample Q is higher than sample R's.

Answer 1

The correct answer is option B which is the melting points of sample Q and sample R are the same.

Step-by-step explanation:

• According to the question description, Plastic sample Q melted at 20 mins and sample R melted at 10 minutes while providing the heat double than sample Q.
• Melting point of a substance is the temperature on which the substance changes its phase from solid to liquid.
• This temperature is actually the amount of heat. The melting can be reached a point early by giving large amount of heat.
• Hence the melting points will be same, just time to reach that points will be different according to amount of heat given.