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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Give a Word Equation for the Following Reaction. Two Solids Which Combine on Heating, to Give a Liquid. - Chemistry

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प्रश्न

Give a word equation for the following reaction.

Two solids which combine on heating, to give a liquid.

एका वाक्यात उत्तर

उत्तर

Carbon + Sulphur → Carbon disulphide

C + S → CS(l)

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पाठ 5: Language of Chemistry - Objective Type Questions

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विराफ जे. दलाल New Simplified Middle School Chemistry [English] Class 7
पाठ 5 Language of Chemistry
Objective Type Questions | Q 2.1

संबंधित प्रश्‍न

How do the following help in bringing about a chemical change?

pressure.


Complete and balance the following chemical equations:

\[\ce{Pb(NO3)2->[heat]}\] _________


Write the missing reactants and products and balance the equations.

\[\ce{KClO3 ->[heat]}\] ___________+ ____________


What are oxides ? 


TRUE \ FALSE

Ammonia is a good oxidizing agent.


Define electrolysis.


Fill in the blank

A new substance is always formed in a _______ change.


Fill in the blank:
The substances which undergo chemical change are called _______


Balancing a chemical equation is based on


Explain the following reaction with one suitable example of Decomposition reaction


Name the type of chemical reaction shown by the following equation:

NaOH + HCl → NaCl + H2O


Name the type of chemical reaction shown by the following equation :

Fe2O3 + 2Al → Al2O3 + 2Fe


Match the pairs.

a. Photosynthesis i.  Tendency to lose electrons
b. Water ii.  Reactant in combustion process
c. Sodium chloride iii.  Chemical change
d. Dissolution of salt in water  iv.  Covalent bond
e. Carbon v.  Ionic bond
f. Fluorine vi.  Physical change 
g. Magnesium vii.  Tendency to form anion

When electric current is passed through acidulated water ______ of water takes place. 


Write the chemical reaction where the following changes are observed.

Precipitate is formed


What is a chemical change? Give two examples of chemical change?


Give a chemical test to distinguish between the following gases. 

HCl and Cl2


Complete the table given below.

Heat on iodine crystals Colour of vapours evolved  

Explain the Silver nitrate solution is kept in coloured reagent bottles in the laboratory.


Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.

Calcium hydroxide.


Burning of paper is a ______ change.


Photosynthesis is a chemical reaction that takes place in the presence of ______.


State whether the following statements are true or false:

When a candle burns, both physical and chemical changes take place.


Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.


Iron and rust are the same substances.


Match the following:

  Column I   Column II
1. Burning of coal a. Rusting
2. Painting of a surface b. Evaporation
3. Dipping iron in the water c. Chemical change
4. Salt from seawater d. Prevention of rusting

Write a note on the following:

Fermentation


Why is spoiling food a chemical change?


When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.


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