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Questions and Answers
What is the primary characteristic that distinguishes a chemical reaction from a physical change?
What is the primary characteristic that distinguishes a chemical reaction from a physical change?
- Change in the state of the reactants
- Change in temperature
- Change in the locations of electrons in the formation and breaking of chemical bonds (correct)
- Formation of a precipitate
Which of the following is NOT a factor that influences the rate of a chemical reaction?
Which of the following is NOT a factor that influences the rate of a chemical reaction?
- Nuclei of the atoms involved (correct)
- Pressure of the reaction mixture
- Temperature
- Concentration of reactants
What is the term for the minimum energy required for a chemical reaction to occur?
What is the term for the minimum energy required for a chemical reaction to occur?
- Potential energy
- Kinetic energy
- Thermal energy
- Activation energy (correct)
Which of the following is an example of a physical change that might be mistaken for a chemical reaction?
Which of the following is an example of a physical change that might be mistaken for a chemical reaction?
What is the purpose of a chemical equation in describing a chemical reaction?
What is the purpose of a chemical equation in describing a chemical reaction?
What is the term for the process of transforming reactants into products in a chemical reaction?
What is the term for the process of transforming reactants into products in a chemical reaction?
What is the primary purpose of using air-tight containers in preventing a certain type of chemical reaction?
What is the primary purpose of using air-tight containers in preventing a certain type of chemical reaction?
Which type of reaction is exemplified by the reaction of carbon with oxygen to form carbon dioxide?
Which type of reaction is exemplified by the reaction of carbon with oxygen to form carbon dioxide?
What is the term used to describe the reaction that occurs when silver chloride turns black on exposure to sunlight?
What is the term used to describe the reaction that occurs when silver chloride turns black on exposure to sunlight?
At which electrode is oxygen gas formed during the electrolysis of water?
At which electrode is oxygen gas formed during the electrolysis of water?
What is the purpose of acidifying water during electrolysis?
What is the purpose of acidifying water during electrolysis?
What is the type of reaction that occurs when hydrogen ions gain electrons at the cathode during electrolysis of water?
What is the type of reaction that occurs when hydrogen ions gain electrons at the cathode during electrolysis of water?
What is the primary purpose of using coefficients in chemical equations?
What is the primary purpose of using coefficients in chemical equations?
What is the hit and trial method used for in balancing chemical equations?
What is the hit and trial method used for in balancing chemical equations?
What is the purpose of setting up a series of simultaneous equations in the short-cut technique for balancing a chemical equation?
What is the purpose of setting up a series of simultaneous equations in the short-cut technique for balancing a chemical equation?
What is the result of balancing the chemical equation aCaCO3 + bH3PO4 → cCa3(PO4)2 + dH2CO3 using the short-cut technique?
What is the result of balancing the chemical equation aCaCO3 + bH3PO4 → cCa3(PO4)2 + dH2CO3 using the short-cut technique?
What is the underlying principle of balancing chemical equations?
What is the underlying principle of balancing chemical equations?
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