Describe which of the experiments are exothermic or endothermic. Explain on how each reaction should be defined. Part 1: Elephant Toothpaste Materials: 120 mL 3% hydrogen peroxide 1.5 liter empty plastic bottle Dry Yeast Food coloring Dishwashing Liquid Basin Warm water Spoon or Small Medicine Cup Paper or glass cup Funnel (if available) Procedures: 1. Prepare a place where you want to perform your experiment. It is preferable to do it in the bathroom for easy cleaning and washing. 2. Place the empty bottle in the basin. Then, pour in the 120 mL hydrogen peroxide it into the bottle. 3. Squirt 1 tbsp. of liquid detergent into the bottle, and swirl gently to mix. 4. Add in 1 packet of food coloring. 5. In a cup, mix together 1 tbsp. of yeast and 3 tbsp. of warm water. Stir for about 30 seconds. 6. Pour the yeast mixture into the bottle. Watch the reaction unfold. Keep a distance away from the experiment. Part 2: Ice Breaker Materials: Ice (can be ice cubes or in plastic bags) Rock salt Ice pick (optional) 2 Water Glasses Spoon Small Medicine Cup or Measuring Cups Procedure: 1. Get some ice from the freezer. If you bought one in the store, crush the ice using an ice pick into smaller pieces. 2. Label the glasses as Glass 1 and 2. Place the ice in both glasses. Observe the corresponding effect of the ice in its container for at least 1 minute. 3. After a while, sprinkle 3 tsp. of salt in Glass 1. Wait for 5-15 minutes or if there is something significant occurs. 4. Check the effect of salt to the ice and compare it to its previous state. You can feel the container and see differences on its appearance based on observation. 5. Compare the levels of melted water between the two glasses. Separate it from the ice by pouring it in other glasses. You can measure it with a medicine measuring cup or other tools.
Describe which of the experiments are exothermic or endothermic. Explain on how each reaction should be defined. Part 1: Elephant Toothpaste Materials: 120 mL 3% hydrogen peroxide 1.5 liter empty plastic bottle Dry Yeast Food coloring Dishwashing Liquid Basin Warm water Spoon or Small Medicine Cup Paper or glass cup Funnel (if available) Procedures: 1. Prepare a place where you want to perform your experiment. It is preferable to do it in the bathroom for easy cleaning and washing. 2. Place the empty bottle in the basin. Then, pour in the 120 mL hydrogen peroxide it into the bottle. 3. Squirt 1 tbsp. of liquid detergent into the bottle, and swirl gently to mix. 4. Add in 1 packet of food coloring. 5. In a cup, mix together 1 tbsp. of yeast and 3 tbsp. of warm water. Stir for about 30 seconds. 6. Pour the yeast mixture into the bottle. Watch the reaction unfold. Keep a distance away from the experiment. Part 2: Ice Breaker Materials: Ice (can be ice cubes or in plastic bags) Rock salt Ice pick (optional) 2 Water Glasses Spoon Small Medicine Cup or Measuring Cups Procedure: 1. Get some ice from the freezer. If you bought one in the store, crush the ice using an ice pick into smaller pieces. 2. Label the glasses as Glass 1 and 2. Place the ice in both glasses. Observe the corresponding effect of the ice in its container for at least 1 minute. 3. After a while, sprinkle 3 tsp. of salt in Glass 1. Wait for 5-15 minutes or if there is something significant occurs. 4. Check the effect of salt to the ice and compare it to its previous state. You can feel the container and see differences on its appearance based on observation. 5. Compare the levels of melted water between the two glasses. Separate it from the ice by pouring it in other glasses. You can measure it with a medicine measuring cup or other tools.
Chapter6: The States Of Matter
Section: Chapter Questions
Problem 6.78E
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
Identify which of the two experiments is an endothermic and exothermic reaction. Explain how each reaction should be define.
Transcribed Image Text:Describe which of the experiments are exothermic or
endothermic. Explain on how each reaction should be defined.
Part 1: Elephant Toothpaste
Materials:
120 mL 3% hydrogen peroxide
1.5 liter empty plastic bottle
Dry Yeast
Food coloring
Dishwashing Liquid
Basin
Warm water
Spoon or Small Medicine Cup
Paper or glass cup
Funnel (if available)
Procedures:
1. Prepare a place where you want to perform your experiment. It is preferable to do it in the
bathroom for easy cleaning and washing.
2. Place the empty bottle in the basin. Then, pour in the 120 mL hydrogen peroxide it into
the bottle.
3. Squirt 1 tbsp. of liquid detergent into the bottle, and swirl gently to mix.
4. Add in 1 packet of food coloring.
5. In a cup, mix together 1 tbsp. of yeast and 3 tbsp. of warm water. Stir for about 30
seconds.
6. Pour the yeast mixture into the bottle. Watch the reaction unfold. Keep a distance away
from the experiment.
Part 2: Ice Breaker
Materials:
Ice (can be ice cubes or in plastic bags)
Rock salt
Ice pick (optional)
2 Water Glasses
Spoon
Small Medicine Cup or Measuring Cups
Procedure:
1. Get some ice from the freezer. If you bought one in the store, crush the ice using an ice
pick into smaller pieces.
2. Label the glasses as Glass 1 and 2. Place the ice in both glasses. Observe the
corresponding effect of the ice in its container for at least 1 minute.
3. After a while, sprinkle 3 tsp. of salt in Glass 1. Wait for 5-15 minutes or if there is
something significant occurs.
4. Check the effect of salt to the ice and compare it to its previous state. You can feel the
container and see differences on its appearance based on observation.
5. Compare the levels of melted water between the two glasses. Separate it from the ice by
pouring it in other glasses. You can measure it with a medicine measuring cup or other
tools.
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