Concept explainers
When magnesium metal is burned in air (Figure 3.6 ), two products are produced. One is magnesium oxide, MgO. The other is the product of the reaction of Mg with molecular nitrogen, magnesium nitride. When water is added to magnesium nitride, it reacts to form magnesium oxide and ammonia gas. (a) Based on the charge of the nitride ion (Table 2.5 ), predict the formula of magnesium nitride. (b) Write a balanced equation for the reaction of magnesium nitride with water. What is the driving force for this reaction? (c) In an experiment, a piece of magnesium ribbon is burned in air in a crucible. The mass of the mixture of MgO and magnesium nitride after burning is 0.470 g. Water is added to the crucible, further reaction occurs, and the crucible is heated to dryness until the final product is 0.486 g of MgO. What was the mass percentage of magnesium nitride in the mixture obtained after the initial burning? (d) Magnesium nitride can also be formed by reaction of the metal with ammonia at high temperature. Write a balanced equation for this reaction. If a 6.3-g Mg ribbon reacts with 2.57 g NH3(g) and the reaction goes to completion, which component is thelimiting reactant? What mass of H2 (g) is formed in the reaction? (e) The standard enthalpy of formation of solid magnesium nitride is -461.08 kJ/mol. Calculate the standard enthalpy change for the reaction between magnesium metal and ammonia gas.
Want to see the full answer?
Check out a sample textbook solutionChapter 16 Solutions
Chemistry: The Central Science (13th Edition)
- Arrange the following in the order of increasing mass. (a) a potassium ion, K+ (b) a phosphorus molecule, P4 (c) a potassium atom (d) a platinum atomarrow_forward2-59 You are presented with a Lewis dot structure of element X as X.. To which two groups in the Periodic Table might this element belong?arrow_forward2-98 Explain how the ionization energy of atoms changes when proceeding down a group of the Periodic Table and explain why this change occurs.arrow_forward
- Atoms of each of the following elements are essential for life. Give the group name for the following elements:(a) chlorine(b) calcium(c) sodium(d) sulfurarrow_forward10 (c) An element T has a melting point of 30°C and a boiling point of 2440 °C. It conducts electricity at room temperature. It burns in oxygen to form an oxide with formula T₂O₂ which can react with both acids and bases. T also forms a compound with fluorine, which has a high melting point and conducts electricity in molten form. The approximate relative atomic mass of T is 70. (1) What type of oxide is T,O,? (i) Give two properties that indicate that T is probably a metal. 1. 2 (iii) Predict the formula for the fluoride of T E [1] [2] N [1] (iv) What are the products of the electrolysis of the molten fluoride of using inert electrodes? and (v) In which group and period of the Periodic Table will T be placed? group period 21 2) (vi) Write the symbol of the element in the Periodic Table which most closely resembles T.arrow_forwardArrange in order of increasing nonmetallic character. (Use the appropriate <, =, or > symbol to separate substances in the list.) (a) the Period 4 elements V, Ge, and K (b) the Group 5A elements N, As, and Bi Arrange in order of increasing atomic size. (Use the appropriate <, =, or > symbol to separate substances in the list.) (a) the Period 3 elements Mg, Si, and Ar (b) the Group 2A elements Ca, Ba, and Srarrow_forward
- 1. Using the various group classifications from the periodic table, assign all appropriate labels to each of the following elements. Each element will have multiple (2 or more) answers. (a) Silver (b) Tennessine (c) Samarium (d) Antimony 2. Calculate the numbers of each type of nucleon and the number of electrons in each of the following species. (a) neodymium-149 (b) tantalum-179 (c) sellenium-79 dianion (d) krypton-85 trication 3. Write the ground-state electron configuration for the following atoms or ions. Use core notation in your electron configurations at your own discretion. (a) As (b) Au (c) Ce (d) Zn2− (e) Po4+ 4. Write an appropriate set of four quantum numbers (n, l, ms & ms) that could be representative of a valence electron in each of the following atoms or ions. (a) Bi (b) Sr (c) Mo (d) Ru2+ (e) Eu 5. In theory, there are an infinite number of energy levels and atomic orbital types that we can define using the solutions to the Schrödinger…arrow_forwardHypothetical elements X and Y form a molecule XY2, inwhich both Y atoms are bonded to atom X (and not to oneanother). The X—X distance in the elemental form of X is2.04 Å, and the Y—Y distance in elemental Y is 1.68 Å. Whatwould you predict for the X—Y distance in the XY2 molecule?(a) 0.84 Å (b) 1.02 Å (c) 1.86 Å (d) 2.70 Å (e) 3.72 Åarrow_forward(a) How many elements are found in period 4 in the periodic table? (b) How many elements are found in group 4A (or 14)?arrow_forward
- Which of the following statements about the hydrogen atom is FALSE. (A) The hydrogen atom is neutral. (B)The hydrogen atom has a uniform distribution of charge. (C)The hydrogen atom is not polar. (D)The hydrogen atom is spherically symmetric.arrow_forwardConsider the following organic substances: ethanol, propane,hexane, and propanol. (a) Which of these molecules contains an OH group? (b) Which of these molecules containsthree carbon atoms?arrow_forwardName each of the following oxides. Assuming that thecompounds are ionic, what charge is associated with themetallic element in each case? (a) NiO, (b) MnO2, (c) Cr2O3,(d) MoO3.arrow_forward
- Introduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage LearningChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage Learning