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Yogita Ingle 5 years, 5 months ago
A pacemaker is a small device that's placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate
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Electricity:
Electrolytic decomposition is decomposition carried by using electricity.
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(i) They cause air, water and soil pollution.
(ii) They may cause bio-magnification in the food chain and end up in humans.
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Gaurav Seth 5 years, 5 months ago
Exothermic reactions:
- If "chemical reactions" release energy into their surroundings, it is called as exothermic reactions.
- In this reaction, the temperature increases during the progress of the reaction.
- Reactants enthalpy is higher than the products.
- Enthalpy change is negative.
Endothermic reactions:
- If the chemical reactions absorb the heat energy from their surroundings, it is called exothermic reactions.
- In this reaction, the temperature will decrease during the progress of reactions.
- Reactants enthalpy is lower than the products.
- Enthalpy change is positive."
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Gaurav Seth 5 years, 5 months ago
Thermal decomposition of ammonium dichromate (NH4)2Cr2O7 on heating gives N2,Cr2O3 and H2O as follows:
(NH4)2Cr2O7 ---Δ---> N2+Cr2O3+4H2O
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- In a chemical reaction, the reactants are written on the left hand side and the products on the right hand side of the equation.
- An arrow (→) pointing towards the products is inserted between the reactants and the products. It also represents the direction of the reaction.
- A single arrow (→) indicates the direction in which the reaction proceeds.
- A double arrow (⥮) indicates a reversible reaction, i.e. the products recombine to form the reactants.
- A plus sign (+) is inserted between two or more reactants or products formed.
- If reactions are carried out under specific conditions of temperature, pressure, catalyst etc., then these conditions are mentioned on the arrow.
The chemical equation can be made more informative by mentioning the physical states of the reactants and products.
- If gas is liberated as a product then it is represented by an arrow pointing upwards (↑).
- If the product formed is in the form of a precipitate, it is represented by an arrow pointing downwards (↓).
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Meghna Thapar 5 years, 5 months ago
Acids are very common in some of the foods that we eat. Citrus fruits such as oranges and lemons contain citric acid and ascorbic acid, which is better known as vitamin C. Carbonated sodas contain phosphoric acid. Vinegar contains acetic acid. Your own stomach utilizes hydrochloric acid to digest food.
Acids are a distinct class of compounds because of the properties of their aqueous solutions. Those properties are outlined below:
- Aqueous solutions of acids are electrolytes, meaning that they conduct electrical current. Some acids are strong electrolytes because they ionize completely in water, yielding a great many ions. Other acids are weak electrolytes that exist primarily in a non-ionized form when dissolved in water.
- Acids have a sour taste. Lemons, vinegar, and sour candies all contain acids.
- Acids change the color of certain acid-base indicates. Two common indicators are litmus and phenolphthalein. Blue litmus turns red in the presence of an acid, while phenolphthalein turns colorless.
- Acids react with active metals to yield hydrogen gas. Recall that an activity series is a list of metals in descending order of reactivity. Metals that are above hydrogen in the activity series will replace the hydrogen from an acid in a single-replacement reaction, as shown below:
Zn(s)+H2SO4(aq)→ZnSO4(aq)+H2(g)(21.1.1)(21.1.1)Zn(s)+H2SO4(aq)→ZnSO4(aq)+H2(g)
- Acids react with bases to produce a salt compound and water. When equal moles of an acid and a base are combined, the acid is neutralized by the base. The products of this reaction are an ionic compound, which is labeled as a salt, and water.
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Pranjal Yadav 5 years, 5 months ago
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