Questions and Answers
According to the law of conservation of mass, the total mass of the reaction substances is...
always equal to the total mass of the products
In the reaction described by the word equation: sodium + water ---> sodium hydroxide + hydrogen gas...
sodium hydroxide is a product and water is a reactant
What indicates that a chemical equation is balanced?
The numbers of atoms of each element are the same on both sides of the equation.
From a complete and correctly written chemical equation, you can obtain the...
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To balance a chemical equation, you must...
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The formation of a solid product in a chemical reaction can be represented by the symbol...
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In the expression 3CO₂, the numbers 3 and 2 are, respectively...
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What is the total number of molecules that is represented by the follow equation? (Add up the coefficients) NH₄NO₂ ---> N₂ + 2H₂O
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In which type of reaction do two or more compounds react to form one product?
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Which is true regarding single-replacement reactions?
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Which is true regarding double-replacement reactions?
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A mixture of propane and oxygen react to form carbon dioxide and water. What type of chemical reaction is this?
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The slightly soluble solid compound produced in a double-replacement reaction is called a...
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To balance a chemical equation, it is permissible to adjust the...
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In a chemical equation, the symbol (aq) indicates that the substance is...
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Study Notes
Chemical Reactions Overview
- Law of conservation of mass states the total mass of reactants equals the total mass of products.
- In the reaction of sodium and water, sodium hydroxide is the product while water is a reactant.
Balancing Chemical Equations
- A balanced chemical equation has equal numbers of atoms for each element on both sides.
- Balancing requires adjusting coefficients, not subscripts.
- Example: In the expression 3CO₂, "3" is a coefficient and "2" is a subscript.
Reactants and Products
- A complete chemical equation provides formulas for reactants and products, their relative amounts, and physical states.
- Chemical symbols: (s) indicates a solid precipitate; (aq) indicates a substance is dissolved in water.
Types of Chemical Reactions
- Synthesis Reaction: Two or more compounds react to form one product.
- Single-Replacement Reaction: One element replaces another in a compound.
- Double-Replacement Reaction: Involves exchange of ions, producing two new products, often resulting in a precipitate.
- Combustion Reaction: A hydrocarbon like propane reacts with oxygen to yield carbon dioxide and water.
Molecule Calculation
- The total number of molecules in a reaction is determined by summing the coefficients of the reactants and products. Example from NH₄NO₂ to N₂ + 2H₂O yields a total of 4 molecules.
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Description
This quiz covers the essential concepts of chemical reactions, including the law of conservation of mass, balancing chemical equations, and the different types of chemical reactions. Test your knowledge on reactants, products, and their characteristics with practical examples.
