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Question
Fill in the blank
A new substance is always formed in a _______ change.
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Solution
A new substance is always formed in a chemical change.
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RELATED QUESTIONS
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Formation of manure from leaves is a physical change.
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A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer
Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
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The new substances formed during a chemical reaction are called the ..................
Write a short note on the information derived from a balanced chemical equation.
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During a chemical reaction transfer of ________ takes place.
What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
Give an example of a reaction where the following are involved:
Close contact
Write the chemical reaction where the following changes are observed.
Colour change is noticed
Explain,giving one example of the following chemical changes:
Reversible reaction
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Analogy:
H2O: Water:: NaCl: ______.
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
