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Questions in chemistry

📝 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.

📝 Answered - If the pH of water changes from 5.3 to 4.3, is it 1.0 less acidic or 1.0 less basic?

📝 Answered - Propane and oxygen react according to the equation: \[ \text{C}_3\text{H}_8(g) + 5\text{O}_2(g) \rightarrow 3\text{CO}_2(g) + 4\text{H}_2\text{O}(g) \] How many grams of water can be produced from the complete combustion of 2.0 moles of \(\text{C}_3\text{H}_8(g)\)? A. 144.0 B. 82.0 C. 8.0 D. 44.8 E. 22.4

📝 Answered - What derived unit is usually used to express the density of liquids?

📝 Answered - What SI unit would best be used to express the height of your classroom ceiling?