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Questions and Answers
What is the Law of Conservation of Matter?
What is the Law of Conservation of Matter?
- States that matter is always destroyed in reactions
- States that matter does not change form
- States that matter cannot be created or destroyed (correct)
- States that matter can be created
What are the substances present before a chemical reaction called?
What are the substances present before a chemical reaction called?
Reactants
What are the substances present after a chemical reaction called?
What are the substances present after a chemical reaction called?
Products
What is the smallest unit of a compound?
What is the smallest unit of a compound?
What does a subscript indicate in a chemical formula?
What does a subscript indicate in a chemical formula?
What does a coefficient indicate in a chemical formula?
What does a coefficient indicate in a chemical formula?
What cannot happen according to the Law of Conservation of Matter?
What cannot happen according to the Law of Conservation of Matter?
What can happen according to the Law of Conservation of Matter?
What can happen according to the Law of Conservation of Matter?
The mass of the products always ___________ the mass of the reactants.
The mass of the products always ___________ the mass of the reactants.
What does a chemical equation use to describe a chemical reaction?
What does a chemical equation use to describe a chemical reaction?
What is the relationship between the masses of reactants and products?
What is the relationship between the masses of reactants and products?
If a student mixed 100 grams of sugar, 200 grams of water, and 5 grams of flavoring, how much will the solution weigh?
If a student mixed 100 grams of sugar, 200 grams of water, and 5 grams of flavoring, how much will the solution weigh?
What is a closed system?
What is a closed system?
What is matter?
What is matter?
What scientific tool is essential for testing the Law of Conservation of Matter?
What scientific tool is essential for testing the Law of Conservation of Matter?
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Study Notes
Law of Conservation of Matter
- Matter during a chemical reaction remains constant; it cannot be created or destroyed.
- The total number of atoms remains unchanged before and after the reaction.
Reactants and Products
- Reactants are the initial substances present before the reaction.
- Products are the substances formed after the chemical reaction occurs.
Molecules and Compounds
- A molecule is the smallest unit of a compound, consisting of two chemically bonded atoms.
Chemical Notation
- Subscripts indicate the number of atoms of an element within a compound, positioned to the right and slightly below the chemical symbol.
- Coefficients are placed before a chemical formula to show the quantity of molecules present.
Fundamental Principles
- According to the Law of Conservation of Matter, matter cannot be destroyed or created but can undergo changes in state or form.
- The mass of products resulting from a chemical reaction is always equal to the mass of the reactants.
Chemical Equations
- Chemical equations use symbols and formulas to represent chemical reactions clearly and quantitatively.
Practical Application
- In a closed system, matter is isolated, preventing any matter from entering or escaping the environment.
- The concept of mass is defined as anything that possesses mass and occupies space.
Measurement Tools
- A balance is a crucial scientific instrument for verifying the Law of Conservation of Matter, allowing for precise mass measurements.
Example Calculation
- If sugar (100 grams), water (200 grams), and flavoring (5 grams) are mixed, the total weight of the resulting solution will equal 305 grams, demonstrating the conservation of mass principle.
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