Podcast
Questions and Answers
What does the law of conservation of mass state?
What does the law of conservation of mass state?
- Mass can be created during a chemical reaction.
- Mass can be destroyed in a chemical reaction.
- The mass of reactants must equal the mass of products. (correct)
- Mass changes state during a chemical reaction.
In an open system, gases are unable to escape during a reaction.
In an open system, gases are unable to escape during a reaction.
False (B)
What should be equal on both sides of a balanced chemical equation?
What should be equal on both sides of a balanced chemical equation?
The number of each type of atom
Coefficients in a chemical equation indicate the amount of a particular chemical and the ______ of each reactant to products.
Coefficients in a chemical equation indicate the amount of a particular chemical and the ______ of each reactant to products.
Match the following terms with their definitions:
Match the following terms with their definitions:
What is the first step in balancing a chemical equation?
What is the first step in balancing a chemical equation?
To balance an equation, you can change the subscripts of the chemical formulas.
To balance an equation, you can change the subscripts of the chemical formulas.
What should you do if a polyatomic ion appears in both reactants and products during balancing?
What should you do if a polyatomic ion appears in both reactants and products during balancing?
Flashcards
Law of Conservation of Mass
Law of Conservation of Mass
The total mass of the reactants in a chemical reaction must equal the total mass of the products. This means no mass is created or destroyed, only rearranged.
Closed System
Closed System
A chemical reaction where all reactants and products are contained within a sealed system, preventing any mass from entering or leaving.
Open System
Open System
A chemical reaction taking place in an open container, allowing gases to escape and influencing the mass measurement.
Coefficients in a Chemical Equation
Coefficients in a Chemical Equation
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Balancing Chemical Equations
Balancing Chemical Equations
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Subscripts in Chemical Formulas
Subscripts in Chemical Formulas
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Balancing Order: Start with Non-H & Non-O
Balancing Order: Start with Non-H & Non-O
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Balancing Polyatomic Ions
Balancing Polyatomic Ions
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Study Notes
Law of Conservation of Mass
- States that mass cannot be created or destroyed in a chemical reaction.
- Reactants' mass equals products' mass in a closed system.
- Example: 5g hydrogen + 2.5g oxygen = 7.5g water (closed system).
- Closed system: reaction in a sealed vessel (no gas escape).
- Open system: reaction in an unsealed vessel (gas escape possible).
Application to Chemical Equations
- Mass of each atom type remains constant.
- Reactants' atoms (quantity) equal products' atoms (quantity), just rearranged.
- Therefore, reactant and product masses are equal.
Coefficients in Chemical Equations
- Coefficients precede chemical formulas to show quantities.
- Coefficients give ratios of reactants needed for product ratios.
- Used to make atom counts equal on both sides of the reaction.
Balancing Chemical Equations
- Purpose: ensure equal atom numbers on each side (law of conservation).
- Cannot change subscripts (changes the substance).
- Only use coefficients to adjust atom counts.
Balancing Equation Order
- First: balance elements other than hydrogen and oxygen.
- Second: treat polyatomic ions as a whole unit (if present on both sides).
- Third: balance oxygen.
- Fourth: balance hydrogen.
- Fifth: balance elements present separately.
- Sixth: Double-check atom counts are equal.
- Seventh: Reduce coefficients if possible.
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Description
Test your understanding of the Law of Conservation of Mass and its application in chemical reactions. This quiz will cover concepts such as closed and open systems, the role of coefficients in balancing chemical equations, and the importance of mass conservation in chemistry.
