Conservation in chemical reactions quick check lesson 14 unit 3

Answer 1

It seems you're referring to a specific lesson or unit related to conservation in chemical reactions, possibly from a curriculum or textbook. Here’s a brief overview of the principles of conservation related to chemical reactions that may help you with a quick check:

Conservation of Mass

• In any chemical reaction, the total mass of the reactants is equal to the total mass of the products. This means that atoms are neither created nor destroyed in a chemical reaction, only rearranged.

Key Concepts

1. Balanced Chemical Equations:

   • Equations must be balanced to reflect the conservation of mass. This means that the number of atoms of each element must be the same on both sides of the equation.

2. Reactants and Products:

   • Reactants are the starting substances, and products are the substances formed as a result of the reaction. The law of conservation of mass states that the mass of reactants equals the mass of products.

3. Types of Reactions:

   • Synthesis: Two or more reactants combine to form a single product.
   • Decomposition: A single reactant breaks down into two or more products.
   • Single Replacement: An element replaces another element in a compound.
   • Double Replacement: The ions of two compounds exchange places in an aqueous solution to form two new compounds.

Example Problem

1. Given Reaction:
   • \( \text{CH}_4 + 2 \text{O}_2 \rightarrow \text{CO}_2 + 2 \text{H}_2\text{O} \)
   • Check if it is balanced:
     • Reactants: 1 C, 4 H, 4 O
     • Products: 1 C, 4 H, 4 O
   • Conclusion: This equation is balanced, hence obeys the law of conservation of mass.

Practice Questions

1. Write the balanced equation for the combustion of propane \( (\text{C}_3\text{H}_8) \).
2. Identify the type of reaction for the following: \( \text{Zn} + \text{CuSO}_4 \rightarrow \text{ZnSO}_4 + \text{Cu} \).
3. If 10 grams of water are produced in a reaction, how many grams of hydrogen and oxygen were used (given balanced equation of reaction)?

Summary

Understanding and applying the law of conservation in chemical reactions is critical for mastering chemistry concepts. Always remember to check if your chemical equations are balanced and that mass is conserved throughout the reaction process.

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