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Questions and Answers
Which of the following is NOT a sign of a chemical reaction?
Which of the following is NOT a sign of a chemical reaction?
What changes occur during a chemical reaction?
What changes occur during a chemical reaction?
Which scenario provides evidence of a chemical reaction?
Which scenario provides evidence of a chemical reaction?
What is indicated by the formation of a precipitate during a reaction?
What is indicated by the formation of a precipitate during a reaction?
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Which option best describes gas bubbles forming during a reaction?
Which option best describes gas bubbles forming during a reaction?
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What is the main characteristic of an endothermic reaction?
What is the main characteristic of an endothermic reaction?
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Which of the following is an example of an exothermic reaction?
Which of the following is an example of an exothermic reaction?
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What typically happens to the temperature of a mixture during an exothermic reaction?
What typically happens to the temperature of a mixture during an exothermic reaction?
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In the process of photosynthesis, what type of energy is absorbed?
In the process of photosynthesis, what type of energy is absorbed?
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Which statement correctly describes the overall energy change in exothermic reactions?
Which statement correctly describes the overall energy change in exothermic reactions?
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What does the law of conservation of energy state?
What does the law of conservation of energy state?
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In which reaction does methane release energy?
In which reaction does methane release energy?
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What happens to the stored energy during an exothermic reaction?
What happens to the stored energy during an exothermic reaction?
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What does the subscript in a chemical formula indicate?
What does the subscript in a chemical formula indicate?
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What is a characteristic of both endothermic and exothermic reactions?
What is a characteristic of both endothermic and exothermic reactions?
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In the chemical equation $C + O_2 \rightarrow CO_2$, which substances are considered reactants?
In the chemical equation $C + O_2 \rightarrow CO_2$, which substances are considered reactants?
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Which of the following best describes an exothermic reaction?
Which of the following best describes an exothermic reaction?
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What does the arrow in a chemical equation represent?
What does the arrow in a chemical equation represent?
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What is the chemical formula for water, and what does it indicate about the atoms in it?
What is the chemical formula for water, and what does it indicate about the atoms in it?
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If the chemical equation shows $2H_2 + O_2 \rightarrow 2H_2O$, what is true about the number of molecules involved?
If the chemical equation shows $2H_2 + O_2 \rightarrow 2H_2O$, what is true about the number of molecules involved?
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What does the law of conservation of mass state?
What does the law of conservation of mass state?
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Which of the following is true about coefficients when balancing chemical equations?
Which of the following is true about coefficients when balancing chemical equations?
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In the example provided, how many oxygen atoms are present in the balanced equation 2C + O₂ → 2CO?
In the example provided, how many oxygen atoms are present in the balanced equation 2C + O₂ → 2CO?
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What happens when you change the subscripts of a chemical formula?
What happens when you change the subscripts of a chemical formula?
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How do you determine the total number of hydrogen atoms in the formula 3H₂O?
How do you determine the total number of hydrogen atoms in the formula 3H₂O?
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What is the role of coefficients in a balanced chemical equation?
What is the role of coefficients in a balanced chemical equation?
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What is the first step in balancing a chemical equation?
What is the first step in balancing a chemical equation?
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In the reaction of carbon combustion, how many carbon atoms are required if two CO molecules are produced?
In the reaction of carbon combustion, how many carbon atoms are required if two CO molecules are produced?
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What primarily determines the rate at which a chemical reaction occurs?
What primarily determines the rate at which a chemical reaction occurs?
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How does increasing the concentration of reactants affect the reaction rate?
How does increasing the concentration of reactants affect the reaction rate?
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What happens to the reaction rate when the temperature is increased?
What happens to the reaction rate when the temperature is increased?
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Why does increasing the surface area of reactants speed up reaction rates?
Why does increasing the surface area of reactants speed up reaction rates?
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What is the role of a catalyst in a chemical reaction?
What is the role of a catalyst in a chemical reaction?
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Which factor can affect the rate of a reaction primarily by altering the frequency of collisions?
Which factor can affect the rate of a reaction primarily by altering the frequency of collisions?
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Which statement about enzymes is true?
Which statement about enzymes is true?
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What would likely happen if the surface area of a solid reactant is reduced?
What would likely happen if the surface area of a solid reactant is reduced?
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