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Questions and Answers
What is a chemical equation?
What is a chemical equation?
- A representation of a chemical reaction using symbols and formulas (correct)
- A calculation of the energy change during a reaction
- A description of the physical properties of substances
- A measurement of the amount of reactants and products
What is the purpose of balancing a chemical equation?
What is the purpose of balancing a chemical equation?
- To determine the energy change of the reaction
- To calculate the concentration of the reactants and products
- To ensure the law of conservation of mass is obeyed (correct)
- To predict the color change in the reaction
Which one of the following describes a chemical reaction?
Which one of the following describes a chemical reaction?
- A change in mass (correct)
- A change in state
- A change in color
- A change in temperature
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Study Notes
Chemical Equations
- A chemical equation is a symbolic representation of a chemical reaction, where reactants are converted into products.
- It is a concise way to express the reactants, products, and direction of a chemical reaction.
Purpose of Balancing a Chemical Equation
- The purpose of balancing a chemical equation is to ensure that the number of atoms of each element is equal on both the reactant and product sides.
- This is necessary to follow the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.
Describing a Chemical Reaction
- A chemical reaction is a process where one or more substances (reactants) are converted into new substances (products).
- It involves a change in the chemical bonds between atoms, resulting in a transformation of the reactants into products.
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