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Questions in chemistry

📝 Answered - The addition of a catalyst in a chemical reaction: A. Increases the concentration of products at equilibrium. B. Increases the fraction of reactant molecules with a given kinetic energy. C. Provides an alternate path with a different activation energy. D. Lowers the enthalpy change in the overall reaction.

📝 Answered - What are three facts about the biosphere?

📝 Answered - Which of the following is not a metal? A) Ca B) Se C) Zn D) Mn

📝 Answered - How to identify the mesomeric effect and inductive effect?

📝 Answered - Which contains more molecules: A. 1.00 mol H\(_2\)O\(_2\) B. 1.00 mol C\(_2\)H\(_6\) C. 1.00 mol CO

📝 Answered - Is a strong acid: a. NaC₂H₃O₂ b. HC₂H₃O₂ c. KCl d. NH₃ e. HCl

📝 Answered - What is the type of bond between atoms of potassium and chloride in a crystal of potassium chloride? A. hydrogen bond B. ionic bond C. polar covalent bond D. pure covalent bond E. metallic bond

📝 Answered - A voltaic cell is set up, and a chemical reaction proceeds spontaneously. Which of the following will not occur in this reaction? A. The electrons will migrate through the wire. B. The cations in the salt bridge will migrate to the anode half-cell. C. The cathode will gain mass. D. The anode will lose mass. E. Reduction will occur at the cathode.

📝 Answered - When water evaporates at constant pressure, the sign of the change in enthalpy: A. is negative. B. is positive. C. depends on the temperature. D. depends on the volume of the container. E. does not exist; that is, the enthalpy change is zero.

📝 Answered - Does a solution have to involve a liquid? Explain.