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प्रश्न
What kind of a change is associated with decaying of a plants?
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उत्तर
Decaying plants is associated with slow change and chemical change.
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संबंधित प्रश्न
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Complete and balance the following chemical equations
Na + H2 O →
Complete and balance the following chemical equations:
Fe `"SO"_4` + NaOH `→`
(aq.) (aq.)
What do you observe when iron nail is kept in copper sulphate solution for sometime.
FILL IN THE BLANK
Negatively charged ions are called ..........
Fill in the blank:
The substances which undergo chemical change are called _______
Name the type of chemical reaction shown by the following equation:
NaOH + HCl → NaCl + H2O
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
The spoiling of food is a chemical change which is recognized from the generation of certain ______ due to it.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Give an example of a reaction where the following are involved
Catalyst
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
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:
Copper nitrate to nitrogen dioxide
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.
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
________ is a chemical substance which alters the speed of a chemical reaction.
Chemists identify gypsum as a natural indicator.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
Write a note on the following:
Curdling of milk
When carbon dioxide is passed through lime water ______.
