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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

State What You Would Observe When the Following Substance is Heated in a Glass Test Tube Copper (Ii) Carbonate Red Lead .

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प्रश्न

State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .

टीपा लिहा
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उत्तर

CuCO3 → CuO + CO2 ↑
The blue-green powder turns black and a colourless gas is evolved which extinguishes a burning flame.

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पाठ 5: Language of Chemistry - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Additional questions | Q 6.2

संबंधित प्रश्‍न

Complete and balance the following chemical equations:

Fe `"SO"_4`  + NaOH  `→`

   (aq.)          (aq.)


FILL IN THE BLANK

On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.


What is a chemical reaction?


Give an example of a reaction where the following are involved

Electricity


Write the chemical reaction where the following changes are observed.

Precipitate is formed


What do you observe when Cobalt chloride paper is introduced in water vapour.


Give a chemical test to distinguish between the following gases. 

NH3 and HCl


Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.


Give balanced equation for the following conversion affected by heat alone on the substance:

Ammonium dichromate to nitrogen


Complete the table given below.

Addition of dil. H2SO4 to zinc  Test for gas evolved  

True or False. If false, give the correct answer.

Taking a glass of water and freezing it by placing it in the freezer is a chemical change.


Burning of paper is a ______ change.


Two chemical species X and Y combine together to form a product P which contains both X and Y

\[\ce{X + Y -> P}\]

X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?

(i) P is a compound

(ii) X and Y are compounds

(iii) X and Y are elements

(iv) P has a fixed composition


Classify the following as physical or chemical properties

Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.


On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.

(a) Is this a physical or a chemical change?

(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.


State whether the following statement is true or false:

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


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

Is the conversion of milk into ice cream a chemical change?


When carbon dioxide is passed through lime water ______.


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