17 Questions
What is the primary characteristic that distinguishes a chemical reaction from a physical change?
Change in the locations of electrons in the formation and breaking of chemical bonds
Which of the following is NOT a factor that influences the rate of a chemical reaction?
Nuclei of the atoms involved
What is the term for the minimum energy required for a chemical reaction to occur?
Activation energy
Which of the following is an example of a physical change that might be mistaken for a chemical reaction?
Change in state
What is the purpose of a chemical equation in describing a chemical reaction?
To represent the reactants, products, and direction of the reaction
What is the term for the process of transforming reactants into products in a chemical reaction?
Chemical reaction
What is the primary purpose of using air-tight containers in preventing a certain type of chemical reaction?
To prevent oxidation reactions
Which type of reaction is exemplified by the reaction of carbon with oxygen to form carbon dioxide?
Combination reaction
What is the term used to describe the reaction that occurs when silver chloride turns black on exposure to sunlight?
Photochemical decomposition reaction
At which electrode is oxygen gas formed during the electrolysis of water?
Anode
What is the purpose of acidifying water during electrolysis?
To facilitate the formation of hydrogen gas
What is the type of reaction that occurs when hydrogen ions gain electrons at the cathode during electrolysis of water?
Reduction reaction
What is the primary purpose of using coefficients in chemical equations?
To ensure the same number of atoms of each element on both sides of the equation
What is the hit and trial method used for in balancing chemical equations?
To change the coefficients to balance the equation
What is the purpose of setting up a series of simultaneous equations in the short-cut technique for balancing a chemical equation?
To balance the equation for each element
What is the result of balancing the chemical equation aCaCO3 + bH3PO4 → cCa3(PO4)2 + dH2CO3 using the short-cut technique?
a=3, b=2, c=1, d=3
What is the underlying principle of balancing chemical equations?
The law of conservation of mass
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