Heat, Thermodynamics, Matter & Chemical Change is one of 9 topics in the Grade 11 Technical Sciences CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. Which equation gives the heat capacity (C) of a substance in terms of its specific heat capacity (c) and mass (m)?
C = cm
C = c/m
C = c+m
C = m/c
Answer: C = cm — Heat capacity relates to specific heat capacity by C = cm, where m is the mass of the substance.
Easy
2. Which equation is used to calculate the heat energy lost or gained by a substance?
Q = mcDeltat
Q = mc + Deltat
Q = m/(cDeltat)
Q = c/(mDeltat)
Answer: Q = mcDeltat — The heat lost or gained by a substance is calculated using Q = mcDeltat, where m is mass, c is specific heat capacity, and Deltat is the change in temperature.
Medium
3. Give ONE term for a thermodynamic system that can exchange energy only, not matter, with its surroundings.
Answer: closed system — A closed system can exchange energy only, not matter, with its surroundings.
