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Catalytic Decomposition of Hydrogen Peroxide H2O2 – Elephant’s Toothpaste Experiment

Catalytic Decomposition of H2O2 – Elephant’s Toothpaste Experiment

Catalytic Decomposition of H2O2 – Elephant’s Toothpaste Experiment
Elephant's toothpaste is a foamy substance formed as a result of rapid decomposition of hydrogen peroxide. Elephant’s toothpaste reaction experiment is generally used for classroom demonstrations as it requires fewer ingredients and makes a "volcano of foam".
Elephant toothpaste

Description:

H2O2 is decomposed by Iodide Ion. Iodide ion is used as a catalyst and these iodide ions come from KI (Potassium Iodide) or NaI (Sodium Iodide). This decomposition reaction liberates water, oxygen and heat.

Materials:

30% H2O2 (Hydrogen Peroxide)
1 Liter Graduated cylinder
KI (Potassium Iodide) or NaI (Sodium Iodide).
Food Color for fun
Liquid Dish Detergent

Procedure:

1.  Pour 50 mL of 30% H2O2 (Hydrogen Peroxide) in 1 L graduated cylinder.
2.  Then, add 3-4 drops of food color in 1 L graduated cylinder to make colored H2O2 solution.
3.  Then, start adding liquid dish detergent or soap from the side of 1 L graduated cylinder to make a small layer of liquid dish detergent or soap over colored H2O2 solution.
4.  With the help of small beaker add KI or NaI in the cylinder containing H2O2 solution. As a result of reaction, oxygen gas generated and this gas creates large amount of colored foam. This foam comes out of graduated cylinder.

Discussion:

Decomposition of H2O2 (Hydrogen Peroxide) yields O2 (oxygen) and H2O (water). Reaction is catalyzed by I- (Iodide Ion); These Iodide Ion comes from KI or NaI

Reaction-

H2O2 (Aq) + I-1 (Aq) ---> H2O (liquid) + IO- (Aq)
IO- (Aq) + H2O2 (Aq) ---> H2O (liquid) +O2 (g) + I- (Aq)

Overall Reaction-

2H2O2 (Aq) ---> 2H2O (liquid) +O2 (g)

Safety:

Wear proper protective equipment likes hand-gloves and safety goggles when preparing and demonstrating this experiment. Remember concentrated H2O2 (Hydrogen Peroxide) can cause burns.

Video of Catalytic Decomposition of H2O2 – Elephant’s Toothpaste Experiment:






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Chemical Reaction Quiz Part16

  Chemical Reaction Quiz

Science Quiz by www.ChemistryNotesInfo.com
Source www.reddit.com
This Chemical Reaction Quiz part16 is based on chemical reactions.

1. Chemical reaction always gives-

Reactants
A change of state
A different substance
Water
All of the above


2. From given below, 4-balanced chemical equations, which is example of combustion reaction-

2Mg + O2 → 2MgO
2N2 + 3H2 → 2NH3
CaO + H2O → Ca(OH)2
2Na + Cl2 → 2NaCl
2CH4 + 4O2 → 2CO2 + 4H2O


3. To balance a chemical equation, you should need to change-

Chemical Formulas
Direction of the arrow
Coefficients
Subscripts
Superscripts


4. In chemistry, if you try to balance a chemical equation by changing its subscripts, than you change the-

Atomic number
Atomic Mass
Mass of the reactants
Number of molecules of product
Identity of the compound


5. From given below, 4-balanced chemical equations, which is example of double displacement reaction-

NH4Cl → NH3 + HCl
Cd(NO3)2 + Na2S → CdS + 2NaNO3
2Mg + O2 → 2MgO
2H2O2 → 2H2O + O2
2N2 + 3H2 → 2NH3


6. Chemical Reaction, KClO3 → KCl + O2 is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


7. Which scientist first determined that the masses of the reactants and the products in a chemical reaction must be same-

Lavoisier
Galileo
Newton
Archimedes
Pasteur


8. Combination reactions (also known as Synthesis Reaction) always-

Involve an element and an ionic compound
Require oxygen gas
Use only one reactant
Form only one product
form only two product


9. In a chemical reaction, the arrow means-

A reaction is happening
The equation is balanced
The products flow into reactants
The two sides are equal
All of the above


10. In a decomposition reaction-

Energy in the form of light or heat is often released
Reactants are commonly two ionic compounds in the aqueous solution
one of the reactant is generally water
Form only one product
Reactants in the chemical reaction are usually a metal and a nonmetal


Chemical Reactions Quiz

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Chemical Reactions Quiz Part15

  Chemical Reactions Quiz

Science Quiz by www.ChemistryNotesInfo.com
Chemical Reaction Quiz
This Chemical Reactions Quiz part15 is based on chemical reaction.

1. Chemical Reaction, 2H₂O → 2H₂ + O₂ is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


2. Chemical Reaction, 8Fe + S₈ → 8FeS is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


3. Chemical Reaction, Zn + H₂SO₄ → ZnSO₄ + H₂ is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


4. Chemical Reaction, AgNO₃ + NaCl → AgCl + NaNO₃ is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


5. Chemical Reaction, CH₄ + 2O₂ → CO₂ + 2H₂O is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


6. Chemical Reaction, 2CO + O₂ → 2CO₂ is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


7. Chemical Reaction, Ca(OH)₂ + H₂SO₄ → CaSO₄ + 2H₂O is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


8. Chemical Reaction, Pb + O₂ → PbO₂ is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


9. Chemical Reaction, 2Fe + 6NaBr → 2FeBr₃ + 6Na is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction


10. Chemical Reaction, 2H₂ + O₂ → 2H₂O is a-

Synthesis Reaction
Decomposition Reaction
Combustion Reaction
Single Displacement Reaction
Double Displacement Reaction



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Science Quiz Part14

Science Quiz on Measuring Devices

Science Quiz by www.ChemistryNotesInfo.com
Science Quiz
This Science Quiz part14 is based on different measuring devices or measuring instruments used in the field of Science.

1. Distance traveled, displacement is measured by:

Taxmeter
Taximeter
Distancemeter
Displacementmeter


2. Surface tension of the liquid is measured by:

Tacheometer
Tintometer
Tensiometer
Tachometer


3. Temperature is measured by:

Thermometer
Thermusmeter
Hygrometer
Hydrometer


4. Ultraviolet light is measured by:

EW Meter
Electromagnetic Wave Meter
UV Meter
VU Meter


5. Very low pressure is measured by:

Pressure Meter
Voltmeter
Viscometer
Vacuum Gauge


6. Viscosity of a fluid is measured by:

Viscosity Meter
Viscometer
Ostwald Viscometer Principle
Viscosity Measurement Devices


7. Electric potential, voltage is measured by:

Voltmeter
Digital DC Voltmeter
Analog Panel Voltmeter
Ammeter


8. Electrical power is measured by:

Ammeter
Wattmeter
Voltmeter
Voltage Meter


9. Wind direction is measured by:
Quiz of Science MCQs

Wind Vane
Weather Vane
Wind Vane Scale
Wind Vane Meter


10. Fermentation is measured by:

fermentometer
Fermometer
Fermentation Meter
Zymometer



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Science Quiz Part13

Science Quiz on Measuring Devices

Science Quiz by www.ChemistryNotesInfo.com
QUIZ
This Science Quiz part13 is based on different measuring devices or measuring instruments used in the field of Science.

1. Color is measured by:

Tintometer
Color Meter
Color Identification Devices
Color Measuring Instrument


2. Speed, velocity of the vehicle is measured by:

Speed Detector
Speed Tester
Speedometer
None of the above


3. Lung capacity is measured by:

ECG Machine
Sphygmomanometers
Stethoscopes
Spirometer


4. Blood pressure is measured by:

Digital Blood Pressure Monitor
Clinical Thermometers
Glucometer
Sphygmomanometer


5. Radius of a sphere is measured by:

Ruler
Spherometer
Diameter
Scale


6. Object range is measured by:

Stadimeter
Kilometer
Milimeter
Meter


7. Seismic strain is measured by:

Science Quiz
Strainmetere
Refractometer
Seismicmeter


8. Standing wave ratio is measured by:

Radiometer
SWR Meter
Wave Ratio Meter
Electrometer


9. Distance is measured by:

Distance Meter
Laser Distance
Distance Measurement Device
Tacheometer


10. Revolutions per minute (RPM), speed of aeroplanes, rate of blood flow is measured by:

Tachometer
Tacheometer
Digital RPM Meter
RPM Meter



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