Energetics Calculations
3 guided lessons · 27 checks · 3. Physical Chemistry → Energetics
Guided lessons for this note
Which concept don't you understand yet?
We'll explain it simply and check your understanding. Pick any lesson — any order works.
0 of 27 checks correct so far
Lesson 1 of 3
Calculating heat energy change
Three ingredients feed the heat working: the mass warmed, the size of the temperature rise and the specific heat capacity of the substance. This lesson assembles them into the expression that every calorimetry answer starts from.
What you know already
From Calorimetry you already know how a temperature change is captured in an insulated vessel. This note turns that reading into heat energy with one expression, then into an energy per mole so different fuels can be compared fairly. Along the way it fixes the sign convention that examiners look for.
Key points of understanding
- The heat energy change is found from the mass heated, the temperature change and the specific heat capacity.
- Specific heat capacity tells you the energy needed for a 1 °C rise in 1 g of the substance.
- Water's specific heat capacity is 4.18 J/g/°C, and solutions are assumed to share it.
- Q is the heat energy change in joules, m the mass in grams and ΔT the temperature change in °C.
- A temperature change in degrees Celsius is the same size as the change in kelvin.
Choose a confidence level to continue.
Prefer to read it all at once? Show the full lesson as a page
1.Calculating heat energy change
Three ingredients feed the heat working: the mass warmed, the size of the temperature rise and the specific heat capacity of the substance. This lesson assembles them into the expression that every calorimetry answer starts from.
Key points
- The heat energy change is found from the mass heated, the temperature change and the specific heat capacity.
- Specific heat capacity tells you the energy needed for a 1 °C rise in 1 g of the substance.
- Water's specific heat capacity is 4.18 J/g/°C, and solutions are assumed to share it.
- Q is the heat energy change in joules, m the mass in grams and ΔT the temperature change in °C.
- A temperature change in degrees Celsius is the same size as the change in kelvin.
Guided content from the SME authoring corpus — note rn_dgVRCKCwn4rTGxGZ, pinned at 51a6ed34e715 · promoted SyllabAI/syllabai-resources e967e75f1339