Chemistry Podcast

Sunday, 25 December 2016

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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Sunday, 18 December 2016

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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Sunday, 11 December 2016

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



Wednesday, 7 December 2016

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



Sunday, 4 December 2016

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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Sunday, 27 November 2016

Science Quiz Part12

Science Quiz on Measuring Devices

Chemistry GK by www.ChemistryNotesInfo.com
Science Quiz, Chemistry Quiz, Chemistry GK, Chemistry MCQ, Science GK, Science MCQ, SPECTROPHOTOMETER
This Science Quiz part12 is based on different measuring devices or measuring instruments used in the field of Science.

1. Intensity of the light as a function of the wavelength is measured by:

Spectrometer
Spectrophotometer
Spectroscopy
Color Spectrophotometer


2. Properties of light is measured by:

Spectrometer
Spectrophotometer
Spectroscopy
Color Spectrophotometer


3. Seismic waves (during earthquakes) is measured by:

Seismic Waves Meter
Surface Buoys
Seismometer
Underwater Sensors


4. Amount of the sugar in a solution is measured by:

Saccharometer
Sugar Meter
Glucometer
Sugar Tester


5. Length is measured by:

Ruler
Insurance
Classes
Degree


6. Response to applied forces is measured by:

Watt-hour meter
Q meter
Rheometer
Rotameter


7. Sugar concentration of the sap & syrup is measured by:

Hygrometer
RF/Microwave
Refractometer
Hydrometer


8. Radiant flux of the electromagnetic radiation is measured by:

Radiometer
Electromagnetic Radiationmeter
Audiometer
Electrometer


9. Thickness of the deposited thin films is measured by:

QC Lab Microbalance
Standard Films Microbalance
Quartz Microbalance
Quartz Crystal Microbalance


10. High temperatures is measured by:

Thermometer
Pyrometer
Hygrometer
Pyranometer



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Saturday, 26 November 2016

Science Quiz Part11

Science Quiz

Chemistry GK by www.ChemistryNotesInfo.com
This Science Quiz part11 is based on different measuring devices or measuring instruments used in the field of Science.
Science Quiz

1. Osmotic strength of the solution, colloid is measured by:

Osmosisindicator
pH Meter
Osmometer
Rotameter


2. pH is measured by:

Pyrometer
pH Meter
Ohmmeter
Berometer


3. Illuminance or irradiance is measured by:

Photometer
Light Meter
Quadrat
Load Cell


4. Rotation of polarized light is measured by:

Photometer
Light Meter
Quadrat
Polarimeter


5. Voltage is measured by:

Potentiometer
Orchidometer
Ohmmeter
Ammeter


6. Surface roughness is measured by:

Mass Spectrometer
Mass Flow Meter
Nephelometer
Profilometer


7. Angles is measured by:

Hydrometer
Protractor
Scale
Inkometer


8. Humidity is measured by:

Hydrometer
Glucometer
Psychrometer
Electrometer


9. Fluid density is measured by:

Potentiometer
Pycnometer
Psychrometer
Interferometer


10. Solar radiation is measured by:

Thermometer
Rotameter
Rular
Pyranometer




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Thursday, 17 November 2016

Chemistry GK Part10

Science General Knowledge

Chemistry GK by www.ChemistryNotesInfo.com
This chemistry GK part10 is based on different measuring devices or measuring instruments used in chemistry and science.

Q1. Measurement of force is measured by
Load Cell

  • Load Meter
  • Mass Cell
  • Weight Cell
  • Load Cell
Ans of Chemistry GK MCQ Question Q1: Load Cell

Q2. Intensity of light is measured by

  • Lux Meter
  • Light Meter
  • Photometer
  • Disdrometer
Ans of Chemistry GK MCQ Question Q2: Lux Meter

Q3. The mass flow rate of a fluid traveling through the tube is measured by

  • Fluid Flow Meter
  • Volume Flow Meter
  • Mass flow meter
  • Volume Flow Gauge
Ans of Chemistry GK MCQ Question Q3: Mass flow meter

Q4. ______ is used in measurement of strength of magnetic fields

  • Polometer
  • Bolometer
  • Magnetometer
  • Radiometer
Ans of Chemistry GK MCQ Question Q4: Magnetometer

Q5. The masses of ions, used to identify chemical substance or chemical substances through their mass spectra is measured by

  • Optical Emission Spectrometer
  • Mass Spectrometer
  • Modular Spectrometer
  • UV-Visible Spectrometer
Ans of Chemistry GK MCQ Question Q5: Mass Spectrometer

Q6. ____ device is used to measure electrical potential, resistance, and current

  • Multimeter
  • Potentiometer
  • Digital Multimeter
  • Analog Multimeter
Ans of Chemistry GK MCQ Question Q6: Multimeter

Q7. _______ is use to measure atmospheric pressure

  • Atmosphere Barometer
  • Arab Barometer
  • Mercury Barometer
  • Air Barometer
Ans of Chemistry GK MCQ Question Q7: Mercury Barometer

Q8. Device use to measure the speed and direction of clouds

  • Nephoscope
  • Nephoscoper
  • Mirror Nephoscope
  • Nefoscope
Ans of Chemistry GK MCQ Question Q8: Nephoscope

Q9. ______ is use to measure electrical resistance

  • Chemical Resistance Meter
  • Shunt
  • Resistance Meter
  • Ohm Meter
Ans of Chemistry GK MCQ Question Q9: Ohmmeter

Q10. Oscillations is measured by

    Science Quiz
  • Oscillator
  • Vectorscope
  • Oscilloscope
  • Oscillometer
Ans of Chemistry GK MCQ Question Q10: Oscilloscope

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Monday, 14 November 2016

Chemistry GK Part9

Chemistry MCQ

Chemistry GK by www.ChemistryNotesInfo.com
This chemistry GK part9 is based on different measuring devices or measuring instruments used in chemistry and science.

Q1. Fuel level is measured by

  • Speedometer
  • Fuel Scale
  • Fuel Meter
  • Fuel Gauge
Ans of Chemistry GK MCQ Question Q1: Fuel Gauge

Q2. Electricity is measured by
Chemistry mcq

  • Ammeter
  • Galvanometer
  • Amplifier
  • Currentmeter
Ans of Chemistry GK MCQ Question Q2: Galvanometer

Q3. Volume and density of solids is measured by

  • Dilatometer
  • Caliper
  • Densimeter
  • Gas Pycnometer
Ans of Chemistry GK MCQ Question Q3: Gas Pycnometer

Q4. ______ is used in measurement of blood glucose (diabetes)

  • Glucometer
  • Blood Glucose Monitor or Glucose Tester
  • Glucose Meter
  • Glucometer or Glucose Meter
Ans of Chemistry GK MCQ Question Q4: Glucometer and Glucose Meter

Q5. Specific gravity of liquids (density of liquids) is measured by

  • Fathometer
  • Thermometer
  • Hygrometer
  • Hydrometer
Ans of Chemistry GK MCQ Question Q5: Hydrometer

Q6. ____ device is used to measure humidity

  • Dynamometer
  • Thermometer
  • Hygrometer
  • Hydrometer
Ans of Chemistry GK MCQ Question Q6: Hygrometer

Q7. _______ is use to measure wave interference

  • Actinometer
  • Elaeometer
  • Interferometer
  • Load Cell
Ans of Chemistry GK MCQ Question Q7: Interferometer

Q8. Device use to measure composition of gases

  • Heliometer
  • Inkometer
  • Katharometer
  • Lux Meter
Ans of Chemistry GK MCQ Question Q8: Katharometer

Q9. ______ is use to measure specific gravity of milk

  • Gasometer
  • Lactometer
  • Milk Meter
  • Chemical Tester
Ans of Chemistry GK MCQ Question Q9: Lactometer

Q10. Light in photography is measured by

  • Light Meter
  • Ellipsometer
  • Photometer
  • Light detector
Ans of Chemistry GK MCQ Question Q10: Light Meter

We publish some chemistry general knowledge question-answer (Chemistry MCQs) to increase your chemical science GK.


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