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What are the substances that undergo changes in a chemical reaction called?
What are the substances that undergo changes in a chemical reaction called?
In a balanced chemical equation, the number of atoms of each element is different on both sides.
In a balanced chemical equation, the number of atoms of each element is different on both sides.
False
What is the primary process involved in combination reactions?
What is the primary process involved in combination reactions?
Two or more reactants combine to form a single product.
Iron reacts with oxygen and moisture to form ______, which is a redox reaction.
Iron reacts with oxygen and moisture to form ______, which is a redox reaction.
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Which type of reaction involves an acid and a base reacting to form a salt and water?
Which type of reaction involves an acid and a base reacting to form a salt and water?
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Match the type of reaction to its description:
Match the type of reaction to its description:
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Fermentation is a chemical reaction that turns sugars into alcohol and carbon dioxide.
Fermentation is a chemical reaction that turns sugars into alcohol and carbon dioxide.
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Name one real-life application of combustion reactions.
Name one real-life application of combustion reactions.
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Which type of reaction involves the combination of two or more substances to form a single product?
Which type of reaction involves the combination of two or more substances to form a single product?
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In a decomposition reaction, a single substance breaks down into simpler substances.
In a decomposition reaction, a single substance breaks down into simpler substances.
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What is maintained in a balanced chemical equation regarding the number of atoms?
What is maintained in a balanced chemical equation regarding the number of atoms?
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The process of converting carbon dioxide and water into glucose using sunlight is called ______.
The process of converting carbon dioxide and water into glucose using sunlight is called ______.
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Match the type of chemical reaction with its description:
Match the type of chemical reaction with its description:
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Which of the following is an example of an exothermic reaction?
Which of the following is an example of an exothermic reaction?
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Reactants are the substances produced at the end of a chemical reaction.
Reactants are the substances produced at the end of a chemical reaction.
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Name a common real-life application of a displacement reaction.
Name a common real-life application of a displacement reaction.
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In a redox reaction, one substance is oxidized while another is ______.
In a redox reaction, one substance is oxidized while another is ______.
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What process involves the release of heat to the surroundings during a chemical reaction?
What process involves the release of heat to the surroundings during a chemical reaction?
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Study Notes
Reactants and Products
- A chemical reaction involves the rearrangement of atoms to form new substances.
- Substances that undergo changes are called reactants.
- Substances formed as a result of the reaction are called products.
- Reactants are written on the left side of the equation and products on the right side.
- The arrow between them signifies the process of change.
Balancing Equations
- Chemical equations must satisfy the law of conservation of mass. This means the number of atoms of each element must be the same on both sides of the equation.
- Balancing involves adjusting coefficients (numbers placed before formulas) to achieve this equality.
- Coefficients multiply all the atoms within the formula they precede.
- A correctly balanced equation shows the quantitative relationship between reactants and products.
Types of Chemical Reactions
- Combination Reactions: Two or more reactants combine to form a single product. (e.g., 2H₂ + O₂ → 2H₂O)
- Decomposition Reactions: A single reactant breaks down into two or more simpler substances. (e.g., 2H₂O → 2H₂ + O₂)
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Displacement Reactions: One element displaces another element from its compound. (e.g., Fe + CuSO₄ → FeSO₄ + Cu)
- Single Displacement: one element replaces another element in a compound.
- Double Displacement: two elements in two different compounds swap places.
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Redox Reactions: Involve the simultaneous processes of oxidation and reduction.
- Oxidation: Loss of electrons by a substance.
- Reduction: Gain of electrons by a substance.
- Neutralization Reactions: An acid and a base react to form a salt and water. (e.g., HCl + NaOH → NaCl + H₂O)
Real-life Applications of Reactions
- Rusting of Iron: An example of a redox reaction where iron reacts with oxygen and moisture to form iron oxide a process that damages metal structures and surfaces.
- Respiration: A complex chemical process that provides energy and releases CO₂
- Photosynthesis: Plants use sunlight, water, and carbon dioxide to prepare food (glucose).
- Cooking: Chemical reactions change the texture, color, and flavor of food, e.g., baking or frying.
- Fermentation: Microorganisms convert sugars into alcohol and carbon dioxide. Examples include making bread, yogurt, and wine.
- Combustion: The rapid reaction of a substance with oxygen, releasing energy in the form of heat and light. (Burning of fuels for energy).
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Description
This quiz covers the fundamental concepts of chemical reactions, including reactants, products, and the importance of balancing chemical equations. It also highlights different types of reactions, such as combination reactions. Test your knowledge and understanding of these essential chemistry principles!
