User:Master Fakhrey

=My notices and help=

Heat Energy $$[Q]$$
Although the discoverer or inventor of the heat energy equation is unknown, the French chemist Antoine Lavoisier was one of the first scientists to be known for using this formula. In the mid 1780's, Lavoisier first used the formula to determine how much heat was given off by an animal. He kept the guinea pig in an enclosed container in order to melt ice and used the heat energy formula to determine his objective.

Heat energy formula
$$Q=C_p\times m\times \Delta T$$

Where:


 * $$\Delta Q$$ is heat energy,


 * $$m$$ is mass,


 * $$\Delta T$$ is change in temperature,


 * $$C_p$$ is specific heat.

Food energy calculation method
1. Use the measuring cylinder to measure 20 cm3 of water into the boiling tube.

2. Clamp the boiling tube to the clamp-stand.

3. Measure the temperature of the water with the thermometer. Record the temperature in a suitable results table.

4. Choose a piece of dry food and find its mass using the balance. Record the mass in the table.

5. Impale the piece of food carefully on a mounted needle.

6. Light the Bunsen burner and hold the food in the flame until it catches alight.

7. As soon as the food is alight, put it under the boiling tube of water as shown. Try to make sure that as much of the heat from the burning food as possible is transferred to the water. Do this by keeping the flame under the tube.

8. Hold the food in place until the food has burnt completely. If the flame goes out, but the food is not completely burnt, quickly light it again using the Bunsen burner and replace the food beneath the tube.

9. As soon as the food has burned away completely and the flame has gone out, measure the temperature of the water again. Before measuring, stir the water carefully with the thermometer and note down the highest temperature reached in the results table.

10. Repeat the procedure for other foods.

11. Calculate the rise in temperature each time.

12. Calculate the energy released from each food by using this formula.

$$E_{food}=\frac{m_{water}\times \Delta T\times 4.2}{m_{food}}$$

Where:

$$E_{food}$$ is food energy,

$$m_{water}$$ is water mass,

$$\Delta T$$ is change in temperate,

$$m_{food}$$ is the food mass.