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💏intro to chemistry review

key term - Law of Conservation of Mass

Citation:

Definition

The law of conservation of mass states that the total mass of the reactants in a chemical reaction is equal to the total mass of the products. This means that matter cannot be created or destroyed during a chemical process, but rather it is conserved and simply changes form.

5 Must Know Facts For Your Next Test

  1. The law of conservation of mass was a key principle in the development of early atomic theory, as it helped establish the idea that matter is not created or destroyed but simply changes form.
  2. Balancing chemical equations is an essential step in applying the law of conservation of mass, ensuring that the number of atoms of each element is the same on both the reactant and product sides.
  3. Stoichiometric calculations rely on the law of conservation of mass, allowing chemists to determine the quantities of reactants and products involved in a reaction based on the balanced equation.
  4. The law of conservation of mass is a fundamental principle that underpins our understanding of chemical reactions and the behavior of matter at the atomic and molecular level.
  5. Violations of the law of conservation of mass would undermine our entire understanding of chemistry and the physical world, which is why it is considered one of the most important and well-established laws in science.

Review Questions

  • Explain how the law of conservation of mass is reflected in the process of writing and balancing chemical equations.
    • When writing and balancing chemical equations, the law of conservation of mass is applied to ensure that the number of atoms of each element is the same on both the reactant and product sides. This is achieved by adjusting the coefficients in front of the chemical formulas to ensure that the total mass of the reactants is equal to the total mass of the products. Balancing the equation is a crucial step in applying the law of conservation of mass, as it demonstrates that matter is not created or destroyed during the chemical reaction, but rather simply changes form.
  • Describe how the law of conservation of mass is used in the context of reaction stoichiometry.
    • The law of conservation of mass is the foundation for reaction stoichiometry, which involves calculating the quantities of reactants and products involved in a chemical reaction. By using the balanced chemical equation and the law of conservation of mass, chemists can determine the mole ratios of the reactants and products, and then use these ratios to calculate the amounts of each substance present before and after the reaction. This allows for the prediction of the yields of products and the consumption of reactants, which is essential for understanding and controlling chemical processes.
  • Analyze how the law of conservation of mass contributed to the development of early atomic theory and our understanding of the nature of matter.
    • The law of conservation of mass was a crucial piece of evidence that supported the development of early atomic theory. By demonstrating that matter is not created or destroyed during chemical reactions, the law of conservation of mass helped establish the idea that matter is composed of discrete, indivisible particles (atoms) that simply rearrange during chemical processes. This laid the groundwork for further advancements in atomic theory, such as the identification of subatomic particles and the understanding of how atoms combine to form molecules. The law of conservation of mass continues to be a fundamental principle that underpins our modern understanding of the nature of matter and the behavior of chemical systems at the atomic and molecular level.