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Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation?
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Define a chemical reaction. State four observations which help us to d...
Chemical Reaction:
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. It involves the breaking and forming of chemical bonds to create new substances.
Observations indicating a chemical reaction:
- Formation of a Precipitate: When two clear solutions are mixed and a solid substance forms, it indicates a chemical reaction has occurred.
- Color Change: If the color of the reactants changes to a different color after mixing, it suggests a chemical reaction has taken place.
- Evolution of Gas: When bubbles or a gas is released during a reaction, it is a sign that a chemical reaction is happening.
- Change in Temperature: If the temperature of the reaction mixture changes significantly (gets hot or cold), it indicates a chemical reaction has occurred.
Examples:
- Precipitate Formation: Mixing silver nitrate (AgNO3) with sodium chloride (NaCl) results in the formation of a white precipitate of silver chloride (AgCl):
AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq) - Color Change: Combining potassium iodide (KI) and lead(II) nitrate (Pb(NO3)2) leads to the formation of a yellow precipitate of lead(II) iodide (PbI2):
Pb(NO3)2 (aq) + 2KI (aq) → PbI2 (s) + 2KNO3 (aq) - Evolution of Gas: Mixing hydrochloric acid (HCl) with sodium bicarbonate (NaHCO3) produces carbon dioxide gas:
HCl (aq) + NaHCO3 (s) → NaCl (aq) + H2O (l) + CO2 (g) - Change in Temperature: The reaction between magnesium (Mg) and hydrochloric acid (HCl) is exothermic, resulting in a noticeable increase in temperature:
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
By observing these changes, one can determine if a chemical reaction has occurred based on the given criteria.
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Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation?
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Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation?.
Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation?.
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