Question

a certain pure substance is a solid at 15°c. sanjay heated a sample of the solid substance in a beaker using a bunsen burner during science class. he and his partner recorded the temperature at one - minute intervals. their data is recorded in the table below. what conclusion could be applied to the students data?
a as the substance was heated and the temperature rose, a change of state occurred.

b it took ten minutes for the solid substance to change state and melt into a liquid.

c as the substance was heated, both the temperature and the kinetic energy increased.

d the bunsen burner did not supply enough thermal energy to melt the solid substance.

Explanation:

To solve this, we analyze each option:

• Option A: A change of state (like melting) occurs when temperature stops rising during heating (latent heat). Since we don't know if temperature plateaued, we can't conclude this.
• Option B: There's no data given about the time to melt, so this is not supportable.
• Option C: When a solid is heated, thermal energy is transferred to kinetic energy of particles, increasing both temperature (average kinetic energy) and kinetic energy (of individual particles). This is consistent with thermal energy transfer in heating solids (before phase change).
• Option D: There's no data on whether the substance melted or not, so we can't conclude the burner lacked energy.

Answer:

C. As the substance was heated, both the temperature and the kinetic energy increased.