Which of the following correctly identifies the number of each element involved in the chemical formulas? NH4 CO3 A N: 4 H: 4 С: 3 0: 3 В N: 1 H: 1 C: 1 O: 3 C N: 0 H: 4 C: 0 0: 3 D N: 1 H: 4 C: 1 0: 3
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- An ion has 15 protons, 16 neutrons, and 18 electrons. The symbol for the ion is 31P3+. 31P3-. 31Ar3+. 34S+. 34S-.The substance oxygen has the following properties: normal melting point: 54.8 K normal boiling point: 90.2 K triple point: 1.50×10-3 atm, 54.4 K critical point: 49.8 atm, 154.6 K A sample of oxygen is initially at a pressure of 58.9 atm and a temperature of 96.9 K. The pressure on the sample is reduced to 1.50×10-3 atm at a constant temperature of 96.9 K. Which of the following are true?Choose all that apply The sample is initially a liquid. The gas initially present will solidify. The final state of the substance is a gas. One or more phase changes will occur. The final state of the substance is a solid.Ethyl mercaptan is an odorous substance added to natural gas to make leaks easily detectable. A sample of ethyl mercaptan weighing 3.17 mg contains 1.64 mg of sulfur. What is the mass percentage of sulfur in the substance?
- Which of the following has the highest iodine content? Which of the following has the lowest melting point? Which of the following requires the fewest moles of hydrogen for complete hydrogenation? Which of these is likely to be solid at room temperature?Which of the following is a hydroxide ion? H3O + H + H2O - OH -Which elements in each pair is more metallic? Silicon or aluminum
- The following equation shows the reaction of baking soda (NaHCO3) and hydrochloric acid (HCl). NaHCO3+HCl → CO2+H2O+NaCl If you have 3.0 grams of NaHCO3, how many moles of HCl are needed for a complete relation?Which of the following items are pure elements—that is, made up of only one type of atom? Check all that apply. A. Iron B. Cake C. CarbonThe atomic number of sulfur is 16, Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound. a. HS b. HS2 c.H2S d. H3S2