demonstration of exothermic and endothermic reactions
Summary
TLDRThis video script details two distinct chemical reactions: an endothermic and an exothermic process. In the endothermic demonstration, barium hydroxide and ammonium chloride are combined, causing a rapid temperature drop that freezes water, turning it into ice and sticking a piece of wood to a beaker. The exothermic reaction involves calcium carbonate reacting with concentrated sulfuric acid, producing heat and gas, visibly warming the beaker. These experiments vividly illustrate the heat absorption and release in chemical reactions.
Takeaways
- π¬ The script describes two chemical experiments to demonstrate exothermic and endothermic reactions.
- π§ͺ The first experiment involves a mixture of barium hydroxide and ammonium chloride, which is an endothermic reaction.
- π‘οΈ A temperature sensor is used to record the temperature changes during the reactions.
- βοΈ The endothermic reaction causes the temperature to drop, turning water into ice due to heat absorption.
- π The initial temperature of the barium hydroxide solution is around 24 degrees Celsius before the reaction.
- π The second experiment uses calcium carbonate and concentrated sulfuric acid, which is an exothermic reaction.
- π₯ The exothermic reaction generates heat, increasing the temperature and producing gas bubbles.
- π The initial temperature of the second experiment is 22 degrees Celsius.
- π§ The wooden piece is used to demonstrate the extent of the temperature drop in the endothermic reaction by freezing the water between the beaker and the wood.
- π The script emphasizes the observable changes in the state of matter and temperature as a result of the chemical reactions.
- π The script provides a clear example of how chemical reactions can either absorb or release heat, affecting the surroundings.
Q & A
What are the two types of chemical reactions demonstrated in the script?
-The script demonstrates exothermic and endothermic chemical reactions.
What substances are mixed in the endothermic reaction experiment?
-In the endothermic reaction experiment, barium hydroxide and ammonium chloride are mixed.
What method is used to measure temperature changes in the experiments?
-A temperature sensor is used to record the temperature changes during the chemical reactions.
Why does the experimenter wet a piece of wood before the endothermic reaction?
-The wood is wetted to observe the effect of the endothermic reaction on the water, which is expected to freeze due to heat absorption.
What is the initial temperature recorded before starting the endothermic reaction?
-The initial temperature recorded before the endothermic reaction is around 24 degrees Celsius.
What happens to the water between the beaker and the piece of wood during the endothermic reaction?
-The water between the beaker and the piece of wood freezes due to the heat absorption of the endothermic reaction.
What is the second experiment meant to demonstrate?
-The second experiment is meant to demonstrate an exothermic chemical reaction.
Which substances are used in the exothermic reaction experiment?
-Calcium carbonate and concentrated sulfuric acid are used in the exothermic reaction experiment.
What is observed during the exothermic reaction involving calcium carbonate and sulfuric acid?
-During the exothermic reaction, bubbles of gas are formed, and the beaker turns hot, indicating an increase in temperature.
What is the initial temperature recorded before starting the exothermic reaction?
-The initial temperature recorded before the exothermic reaction is 22 degrees Celsius.
What is the significance of the exothermic reaction in the script?
-The exothermic reaction is significant as it demonstrates a chemical process that releases heat, causing an increase in temperature.
Outlines
π§ͺ Endothermic Reaction: Barium Hydroxide and Ammonium Chloride
The first experiment demonstrates an endothermic reaction by mixing barium hydroxide and ammonium chloride. The process begins with placing a temperature sensor in a beaker containing barium hydroxide at 24 degrees Celsius. A wet piece of wood is used to isolate the reaction environment. The addition of ammonium chloride initiates a rapid reaction, causing the temperature to drop significantly, eventually freezing the water between the beaker and the wood into ice. This illustrates the endothermic nature of the reaction, as it absorbs heat from the surroundings, turning liquid water into solid ice.
π₯ Exothermic Reaction: Calcium Carbonate and Concentrated Sulfuric Acid
The second experiment showcases an exothermic reaction by combining calcium carbonate with concentrated sulfuric acid. The initial temperature is recorded at 22 degrees Celsius. As the reaction proceeds, the production of gas bubbles is audible, and the beaker becomes noticeably hot, indicating the release of heat. The temperature rises from the starting point, confirming the exothermic nature of the reaction. This experiment effectively demonstrates how certain chemical reactions can generate heat, converting chemical energy into thermal energy.
Mindmap
Keywords
π‘Endothermic reaction
π‘Barium hydroxide
π‘Ammonium chloride
π‘Temperature sensor
π‘Freezing point
π‘Exothermic reaction
π‘Calcium carbonate
π‘Concentrated sulfuric acid
π‘Gas bubbles
π‘Chemical reaction
π‘Thermodynamics
Highlights
Introduction of two experiments to demonstrate exothermic and endothermic chemical reactions.
Selection of barium hydroxide and ammonium chloride for the endothermic reaction.
Use of a wet piece of wood to demonstrate the temperature change.
Initial temperature recording of 24 degrees Celsius before the reaction.
Observation of the temperature dropping rapidly during the reaction.
Formation of a white liquid as water freezes, indicating an endothermic process.
Demonstration of the beaker becoming extremely cold due to heat absorption.
Successful freezing of water between the beaker and wood, showcasing the endothermic reaction.
Transition to the second experiment showcasing an exothermic chemical reaction.
Use of calcium carbonate and concentrated sulfuric acid for the exothermic reaction.
Initial temperature recording of 22 degrees Celsius for the second experiment.
Audible sound of gas bubbles forming as a sign of the exothermic reaction.
Observation of the beaker heating up and temperature increase.
Illustration of the temperature rising from 22 degrees Celsius due to heat release.
Visual and auditory evidence of the exothermic reaction's heat effect.
Conclusion of the experiment with a clear demonstration of an exothermic reaction.
Transcripts
I am going to do today two experiments
to demonstrate the exothermic and
endothermic chemical reactions so first
we are going to do an endothermic
reaction where I add very own hydroxide
and the ammonium chloride together and I
put some valium hydroxide in this beaker
and in another vehicle I will add
ammonium chloride
before adding these two reactants
together I'm going to use a piece of
wood and I'm going to make it wet so I
pour some water on it now at least the
beaker containing the barium hydroxide
placing the temperature sensor to record
the temperature before the beginning of
the chemical reaction
it is now around 24 degrees Celsius so
now I'm going to add the barium and
ammonium chloride the reaction is very
fast the temperature started to drop
it's gonna go below zero at this point
water will freeze
so it's like a white liquid now and the
beaker is very cold the temperature
keeps on dropping
it is really cold so now after the
reaction finished I'm going to lift this
up and I expect the water that was
between the beaker and piece of wood
froze so no matter how I hardly try to
separate them it's just sticking this is
the some water fan so here okay I'll try
to keep it for a while okay
so here we go the water that was between
the beaker turned to ice see the pieces
of ice this is an endothermic reaction
this experiment this reaction absorbed
the heat that was in the water and
turned the water from liquid to solid
now the second experiment is to show an
exothermic chemical reaction I have here
calcium carbonate and I'm going to add
concentrated sulfuric acid to it so
first we're recording the temperature it
is 22 degree Celsius now you're gonna
hear the sound of the bubbles of gas
forming
it's turning the beaker is turning hot
and the temperature is increasing from
it was we remember we started 22 degrees
Celsius so this has also another example
this is an example to demonstrate an
exhaust ferric reaction
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