Chemical Equations — Practice Quiz
Telangana Board · Class 10 · Physical Sciences
Try a 4-question quiz on Chemical Equations for Telangana Board Class 10 Physical Sciences: tap an answer to check it and see why.
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Quick Quiz: Chemical Equations
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What is a chemical equation?
In a chemical equation, reactants are written on which side of the arrow?
What does CaO + H₂O → Ca(OH)₂ represent?
Why must chemical equations be balanced?
Sample Questions
Which of the following are characteristics of a chemical change?
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Formation of new substances, Change in color, Gas evolution, Heat liberation or absorption
Chemical changes involve formation of new substances with different properties. They may show color change, gas evolution, heat changes, or precipitate formation. Change in shape only is a physical change.
In the equation 2H₂ + O₂ → 2H₂O, what is the coefficient of water?
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2
The coefficient of H₂O is 2, which means 2 molecules of water are formed. Coefficients show the number of formula units involved in the reaction.
Which symbols are used to represent physical states in chemical equations?
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(s) for solid, (l) for liquid, (g) for gas, (aq) for aqueous
Physical states are indicated by (s) for solid, (l) for liquid, (g) for gas, and (aq) for aqueous solution. There is no standard symbol (p) for precipitate.
What does the upward arrow (↑) indicate in a chemical equation?
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Gas evolution
The upward arrow (↑) or (g) indicates that a gas is evolved or released during the chemical reaction.
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