What is the melting point of the substance represented by the complete heating curve below? a line graph showing the heating curve of a substance being heated from the solid phase all the way to the gas phase. the substance starts at a temperature around 0°c and ends at a temperature around 70°c. first, there is an incline with a positive slope from 0°c to 20°c, followed by a horizontal region at 20°c. then there is another incline with a positive slope from 20°c to 60°c, followed by another horizontal region at 60°c. the end of the heating curve shows another incline with a positive slope from 60°c to 70°c.
a. 0°c
b. 20°c
c. 40°c
d. 60°c

option B. 20°C.

Explanation:

1. The melting point is the temperature at which a substance changes from solid to liquid.

2. The phase changes, e.g. melting, boiling, freezing, and condensation, happen at constant temperature.

3. In a temperature vs time diagram, a horizontal (flat) line represents constant temperature.

4. In a temperature vs time diagram, the phases from left to right go from solid to liquid to gas.

4. Hence, the first horizontal  region at 20°C is indicating the constant temperature at which the substance is changing from solid to liquid (melting).

c)red bank

explanation:

red bank is a borough in monmouth county, new jersey, incorporated in 1908 and located on the navesink river, the area's original transportation route to the ocean and other ports.