1. Which letters involve free elements completely? A. Noble gases B. Helium C. Sulfur, platinum D. All 2. Which of the following Daniel cell components show oxidation state? A. +3... 1. Which letters involve free elements completely? A. Noble gases B. Helium C. Sulfur, platinum D. All 2. Which of the following Daniel cell components show oxidation state? A. +3 B. +2 C. It useful concept in chemistry for keeping track of electrons D. All E. B and C are correct 3. Find the mole of N₂O if its mass is 15g in Stoichiometry Puzzle! A. 0.34 B. 0.334 C. 0.324 D. 0.342
Understand the Problem
The questions are asking about various topics in chemistry, including characteristics of elements, oxidation states in a Daniel cell, and stoichiometry calculations involving the mole concept.
Answer
1. D 2. E 3. B
- D - All free elements are those not combined with other elements. 2. E - Both oxidation states +2 in cells and the concept of oxidation are important in understanding electron transfer reactions. 3. B - The mole of N₂O with a mass of 15g is 0.334 moles.
Answer for screen readers
- D - All free elements are those not combined with other elements. 2. E - Both oxidation states +2 in cells and the concept of oxidation are important in understanding electron transfer reactions. 3. B - The mole of N₂O with a mass of 15g is 0.334 moles.
More Information
Free elements refer to elements in their standard states (e.g., noble gases). Oxidation state is a concept used in the study of electron transfer in chemistry. For moles, the mass divided by molar mass gives the number of moles.
Tips
For problem 3, avoid common errors in molar mass calculation or unit conversion.
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