Grade 10 · Science
Use a simple thermal-energy model practice
Apply Q = mcΔT with supplied values and distinguish temperature change from total energy transfer.
Opening your practice adventure…
Try a sample
Two 10 g samples each warm by 2°C. A has c = 1 and B has c = 3 J/(g·°C). Which needs more energy in this model?
- They need equal energy.
- B, by a factor of 3.
- A, by a factor of 3.
- Neither needs energy.
See the answer & why
B, by a factor of 3.
With mass and ΔT fixed, Q is proportional to c.
A little hint: Use the supplied mass and specific heat capacity; ΔT is the final temperature minus the initial temperature.
A teaching tip
Use the supplied mass and specific heat capacity; ΔT is the final temperature minus the initial temperature.