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কোনটি হলো সঠিক?
কোনটি হলো সঠিক?
রাসায়নিক সমীকরণ সামান্য, প্রযুক্তিগত, এরা ________
রাসায়নিক সমীকরণ সামান্য, প্রযুক্তিগত, এরা ________
Chemical reactions play a vital role in industries, customs, and daily life. Which of the following is NOT an example of this?
Chemical reactions play a vital role in industries, customs, and daily life. Which of the following is NOT an example of this?
Chemical reactions result in the creation of new substances by ________.
Chemical reactions result in the creation of new substances by ________.
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'Physical changes involve a change of state.' Which of the following is an example of a physical change?
'Physical changes involve a change of state.' Which of the following is an example of a physical change?
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'Chemists observe chemical reactions and have developed ways to represent them.' Which method is commonly used to represent chemical reactions?
'Chemists observe chemical reactions and have developed ways to represent them.' Which method is commonly used to represent chemical reactions?
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যে ধরনের রিয়েকশনে দুটি বা ততোধিক পদার্থ একটি নতুন পদার্থ গঠন করে?
যে ধরনের রিয়েকশনে দুটি বা ততোধিক পদার্থ একটি নতুন পদার্থ গঠন করে?
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নিম্নোক্ত রিয়েকশনের জন্য উৎরাধিকারির চিহ্নাঙ্কের পরিবর্তন?
নিম্নোক্ত রিয়েকশনের জন্য উৎরাধিকারির চিহ্নাঙ্কের পরিবর্তন?
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‘‘AgNO3’’ এর ‘‘KCl’’ সাথে প্রতিস্থাপন রিয়েকশনে ‘‘AgCl’’ ও ‘‘KNO3’’ তৈরি হয়, এরা ।
‘‘AgNO3’’ এর ‘‘KCl’’ সাথে প্রতিস্থাপন রিয়েকশনে ‘‘AgCl’’ ও ‘‘KNO3’’ তৈরি হয়, এরা ।
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‘H2’’ ,''O2’’ ‘‘H2O’’ ।
‘H2’’ ,''O2’’ ‘‘H2O’’ ।
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'CuSO4' 'Zn' 'ZnSO4' 'Cu' ।
'CuSO4' 'Zn' 'ZnSO4' 'Cu' ।
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'AgNO3' 'KCl' 'AgCl' 'KNO3' ।
'AgNO3' 'KCl' 'AgCl' 'KNO3' ।
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Study Notes
Basic Concepts of Chemistry: Chemical Reactions
Chemical reactions are fundamental processes in chemistry, where substances, referred to as reactants, transform into different substances, known as products. They are integral to various industries, daily life, and even biological processes. Chemical reactions can be classified based on their types and the reactants involved.
Types of Chemical Reactions
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Combination reactions: In these reactions, two or more substances combine to form a single new substance. For example, the reaction between hydrogen (H2) and oxygen (O2) to form water (H2O) is a combination reaction.
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Decomposition reactions: These reactions involve the breakdown of a compound into two or more simpler substances. An example is the decomposition of water by heating, which produces hydrogen gas (H2) and oxygen gas (O2).
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Single-replacement reactions: In these reactions, a metal replaces another metal in a compound. For instance, the reaction between zinc (Zn) and copper sulfate (CuSO4) produces zinc sulfate (ZnSO4) and copper (Cu).
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Double-replacement reactions: These reactions involve the exchange of ions between two compounds. An example is the reaction between silver nitrate (AgNO3) and potassium chloride (KCl), which produces silver chloride (AgCl) and potassium nitrate (KNO3).
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Combustion reactions: These reactions involve the burning of a fuel in the presence of oxygen, resulting in the formation of carbon dioxide (CO2) and water (H2O). For example, the combustion of methane (CH4) with oxygen (O2) produces carbon dioxide and water.
Balancing Chemical Equations
To ensure the law of conservation of mass, chemical equations must be balanced. This means that the number of atoms of each element must be equal on both sides of the equation. For example, the balanced chemical equation for the combustion of methane is:
CH4 + 2O2 → CO2 + 2H2O
Important Points to Remember
- Chemical reactions are accompanied by physical changes, such as precipitation, heat production, or color changes.
- The rate of a chemical reaction depends on factors like pressure, temperature, and the concentration of the reactants.
- Chemical reactions play a vital role in industries, customs, and daily life, including processes like smelting iron, making glass and pottery, brewing beer, and making wine and cheese.
- Chemical reactions are fundamental to biological processes, such as metabolism in our bodies and the reaction between the sun's light and plants during photosynthesis.
Frequently Asked Questions
Q: What is the difference between a physical change and a chemical change? A: Physical changes involve a change of state, such as ice melting or boiling water, while chemical changes involve the formation of a new substance, such as rusting or combustion.
Q: How do chemists determine whether a reaction will occur? A: Chemists observe chemical reactions and have developed ways to represent them, such as chemical equations. They can also use various methods to detect reactions, such as changes in temperature, color, or precipitation.
Q: What is the law of conservation of mass? A: The law of conservation of mass states that matter cannot be created nor destroyed, only rearranged. This means that the number of atoms of each element must be equal on both sides of a balanced chemical equation.
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Description
Explore the basic concepts of chemical reactions, including types like combination, decomposition, single-replacement, double-replacement, and combustion reactions. Learn how to balance chemical equations to ensure the law of conservation of mass. Discover the importance of chemical reactions in various industries, daily life, and biological processes.
