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What are reactants? Explain with the help of example. - Science and Technology 1

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प्रश्न

What are reactants? Explain with the help of example.

लघु उत्तरीय

उत्तर

  1. The substances taking part in chemical reaction are called reactants.
  2. E.g. Formation of carbon dioxide gas by combustion of coal in air is a chemical reaction. In this reaction, coal (carbon) and oxygen (from air) are the reactants while carbon dioxide is the product.
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अध्याय 3: Chemical reactions and equations - Solve the following Questions

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एससीईआरटी महाराष्ट्र Science and Technology 1 [English] 10 Standard SSC
अध्याय 3 Chemical reactions and equations
Solve the following Questions | Q 2.1

संबंधित प्रश्न

Translate the following statement into chemical equation and then balance it.

Hydrogen sulphide gas burns in the air to give water and sulphur dioxide.


Translate the following statement into chemical equation and then balance the equation:

Phosphorus burns in oxygen to give phosphorus pentoxide.


Write balanced chemical equation from the following information:
An aqueous calcium hydroxide solution (lime water) reacts with carbon dioxide gas to produce a solid calcium carbonate precipitate and water.


Write the balanced equation for the following reaction, and add the state symbols:

Sodium hydroxide reacts with sulphuric acid to produce sodium sulphate and water.


When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen. Write a balanced equation for this reaction and add the state symbols of the reactants and products.


An acid which can decolourise purple coloured potassium permanganate solution is:
(a) sulphuric acid
(b) citric acid
(c) carbonic acid
(d) hydrochloric acid


Balance the following chemical equation:


Write your observation for the following chemical reaction and name the product formed :

When dilute acetic acid is poured on baking soda.


Write symbolic representation for the following word equation and balance them :

Calcium carbonate → Calcium oxide + Carbon dioxide.


Write symbolic representation for the following word equation and balance them :

Calcium oxide + Water → Calcium hydroxide


Write symbolic representation for the following word equation and balance them :

Iron + Sulphur → Iron sulphide.


To determine the percentage of water absorbed by raisins, raisins are soaked in water for: 


Balance the equation stepwise.

 Ag(s) + HCl(aq) → AgCl ↓+ H2 ↑ 


Balance the following equation:

NaHCO3 → Na2CO3 + H2O + CO2


What information do the following chemical equations convey? Mg + 2HCl → MgCl2+ H2


Write the balanced chemical equation of the following reaction.

zinc sulphide + oxygen → zinc oxide + sulphur dioxide


Write the balanced chemical equation of the following reaction.

sulphur + nitric acid→ sulphuric acid  + nitrogen dioxide + water.


\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]

0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the mass of acid required.


The chemical reactions in which heat is liberated are called endothermic reactions.


Write word equation for the following molecular equation:

\[\ce{CaCO3 + 2HCl ->[\triangle] CaCl2 + H2O + CO2 [g]}\]

Word equation:

State which characteristic does [g] in the above reaction indicate. The word equation of:


Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.

Catalyst


Balance the following simple equation:

Al   +   N2  →  AlN 


Balance the following simple equation:

\[\ce{Ca(OH)2 + HNO3 -> Ca(NO3)2 + H2O}\]


Balance the following simple equation:

K  +   H2O   →   KOH   +   H2 


Balance the following simple equation:

Ca  +   H2O   →   Ca(OH)2   +   H2 


Balance the following simple equation:

Zn  +   NaOH  →   Na2ZnO2   +   H2 


Balance the following simple equation:

Al  +   H2SO4  →   Al2(SO4)3   +   H2 


Balance the following simple equation:

Mg  +  CO2  →  MgO  +  C


Write a balanced equation for the following word equation:

Aluminium + Oxygen → Aluminium oxide 


With reference to a chemical equation state which of the statements 1 to 5 pertain to A or B.
A: Information provided by a chemical equation. 
B: Limitations of a chemical equation.

  1. The nature of the individual elements.
  2. The speed of the reaction.
  3. The state of matter in which the substance is present.
  4. The completion of the reaction.
  5. The direction of the reaction.

Give a balanced equation by the partial equation method, [steps are given below].

Oxidation of Lead [II] Sulphide by Ozone

  1. Ozone first decomposes to give molecular oxygen & nascent oxygen.
  2. Nascent oxygen then oxidises lead [II] sulphide to lead [II] sulphate. 

Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

C2H5OH + 3O2 → 2CO2 + 2H2O


Writing a chemical reaction in brief by using chemical formulae is called as _______.


What are products? Explain with the help of example.


Which among the following statement(s) is(are) true? ‘Exposure of silver chloride to sunlight for a long duration turns grey due to

  1.  the formation of silver by decomposition of silver chloride
  2.  sublimation of silver chloride
  3. decomposition of chlorine gas from silver chloride
  4. oxidation of silver chloride

Give the characteristic tests for the following gases :

  1. CO2
  2. SO2
  3. O2
  4. H2

To balance the following chemical equation the value of x and y should respectively be:

\[\ce{2NaOH + xAl_2O_3->yNaAlO_2 + H_2O}\]


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