EASY
Earn 100

Define physical changes of matter.

Important Questions on Chemical Changes and Reactions

HARD
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change

If 0.50 moles of BaCl2 is mixed with 0.20 moles of Na3PO4 the maximum number of moles of Ba3(PO4)2 formed will be 

HARD
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
How many litres of CO2 at STP will be formed when 100 ml of 0.1M H2SO4 reacts with excess of Na2CO3?
HARD
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
Write the steps involved in writing a chemical equation.
EASY
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change

Give the word equation for the following and then balance the equation

Nitrogen and hydrogen combines to form ammonia.

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Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
Give the word equation for the following and then balance the equation:
Zinc metal reacts with hydrochloric acid to produce a solution of zinc chloride and hydrogen gas.
HARD
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
What are the various ways to make the chemical equation more informative?
EASY
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
What does the symbol (aq) represent in a chemical equation?
MEDIUM
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
What are the various ways to make the chemical equations more informative with suitable examples?
MEDIUM
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer.
EASY
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
What is meant by word equation? Give an example.
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Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
On which side the reactants and products are written in an equation?
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Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
Differentiate between a balanced and unbalanced equation with an example for each.
EASY
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
What do you understand by the term chemical equation?
EASY
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
Give an example of a balanced chemical equation:
(a) Taking place in the presence of a catalyst.
(b) Taking place in the presence of heat.
(c) Taking place at a particular temperature.
MEDIUM
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
What is the chemical equation? Explain with the help of an example.
EASY
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
Explain, with an example, how the physical states of the reactants and products can be shown in a chemical equation.
MEDIUM
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
What are the steps included while writing a chemical equation?
EASY
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
Define a chemical equation.
EASY
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change

How the concentration of acids is indicated in an equation?

EASY
Science>Chemistry>Chemical Changes and Reactions>Physical and Chemical Change
Cotyledons are also called-