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Energy content of Food and Thermochemistry

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  • A chemical reaction starts at 25°C and ends at 50°C. What kind of reaction is this?
    Exothermic
    Neutral
    Endothermic
  • Which of the following best describes an exothermic reaction?
    A reaction where heat is released
    A reaction where heat is absorbed
    A reaction with no heat change
  • What happens to the energy in an endothermic reaction?
    It is released into the surroundings
    It is absorbed from the surroundings
    It is destroyed
  • How does the body release energy from food?
    Through respiration in cells
    By digesting it in the stomach
    By breaking it down in the intestines
  • What happens to the temperature of the surroundings during an exothermic reaction?
    It decreases
    It increases
    It stays the same
  • Which food item would provide the most energy per gram?
    Lettuce
    Chicken breast
    Butter
  • A chemical reaction takes place in a container, and the container becomes very cold. What type of reaction is this?
    Endothermic
    Neutral
    Exothermic
  • What happens to excess energy from food that is not used by the body?
    It is stored as fat
    It turns into muscle immediately
    It disappears
  • Which type of nutrient provides the most energy per gram?
    Proteins
    Fats
    Carbohydrates
  • Which process is an example of an exothermic reaction?
    Cooking food
    Boiling water
    Freezing water
  • What is the main unit used to measure energy in food?
    Liters (L)
    Kilograms (kg)
    Kilojoules (kJ)
  • Which of the following reactions absorbs heat energy from the surroundings?
    Burning wood
    Ice melting
    Candle burning
  • Why do people need to eat more food in cold weather?
    Cold weather makes digestion slower
    They lose vitamins through sweat
    Their bodies need more energy to stay warm
  • Which of these real-life examples represents an endothermic process?
    Burning of fuel
    Condensation of water vapor
    Evaporation of sweat from skin
  • Which of these is an example of an exothermic reaction?
    Melting ice cubes
    Boiling water
    Condensation of steam
  • Which of the following is an endothermic process?
    Photosynthesis
    Burning coal
    Freezing water
  • What happens if a person consumes more energy than they use?
    They gain weight
    Their metabolism stops
    They lose weight
  • Which of the following food sources is rich in carbohydrates?
    Rice
    Fish
    Cheese
  • A reaction has an initial temperature of 40°C and a final temperature of 10°C. What does this indicate?
    Heat is absorbed
    No energy change
    Heat is released
  • A beaker contains a solution at 28°C. After adding a solid, the temperature rises to 45°C. What does this suggest?
    The reaction is exothermic
    No reaction occurs
    The reaction is endothermic
  • Which of these is an endothermic reaction?
    Fireworks explosion
    Cooking an egg
    Freezing water
  • Which method is commonly used to measure the energy content of food in a lab?
    Bunsen burner test
    Litmus paper test
    Food calorimetry
  • If a food contains 450 kJ of energy, what does this mean?
    It provides 450 kilojoules of energy to the body
    It has 450 grams of fat
    It contains 450 grams of sugar
  • Which statement is true for an exothermic reaction?
    Heat energy is given out to the surroundings
    The final temperature is lower than the initial temperature
    The reaction absorbs energy
  • A reaction starts at 30°C and ends at 15°C. What type of reaction is this?
    Neutral
    Endothermic
    Exothermic
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