Calorimetry: Measuring Energy Content of Food

The video tutorial explains calorimetry, a method to measure thermal energy changes in processes like burning fuel. It details a school lab experiment to measure food energy using a calorimeter, describing steps such as measuring water and food sample mass, heating the sample, and recording temperature changes. The tutorial covers calculating energy transfer using specific heat capacity and discusses fair testing by controlling variables. It also highlights limitations like heat loss and suggests improvements for accurate results.

What is the primary purpose of calorimetry?

• To measure thermal energy changes in a process

• To determine the color of a solution

• To measure the mass of substances

• To calculate the speed of a chemical reaction

What is the first step in conducting a calorimetry experiment?

• Measuring cold water into a calorimeter

• Measuring the mass of the food sample

• Recording the final temperature of water

• Burning the food sample

How is the energy transferred to water calculated?

• By multiplying the mass of water, specific heat capacity, and temperature increase

• By dividing the mass of water by the temperature increase

• By subtracting the initial temperature from the final temperature

• By adding the mass of food and water

What is the specific heat capacity of water used in the calculations?

• 5.0 joules per gram per degree

• 4.2 joules per gram per degree

• 2.4 joules per gram per degree

• 3.6 joules per gram per degree

Why is it important to control the distance between the flame and the calorimeter?

• To minimize heat loss to the environment

• To keep the food sample from burning too quickly

• To ensure the calorimeter does not melt

• To prevent the water from evaporating

What is one limitation of calorimetry in a school lab?

• Inconsistent water temperature

• Unwanted heat loss to the environment

• Difficulty in lighting the food sample

• Inability to measure mass accurately

How can heat loss be reduced during a calorimetry experiment?

• By adding more water

• By insulating the calorimeter and using a lid

• By using a larger calorimeter

• By increasing the distance between the flame and calorimeter