The valence of an element is the number of covalent bonds its atoms form or the charge on the ion it forms in ionic compounds.For the following questions, use the position of an element in the periodic table to deduce its valence.(1) What is the valence of strontium?(2) What is the valence of arsenic?(3) What is the valence of hydrogen?

1. Strontium is represented by Sr. It is a second group element. It's valence shell electronic…

Answered: The valence of an element is the number…

Chemistry In Focus

7th Edition

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Tro, Nivaldo J.

Chapter4: Molecules, Compounds, And Chemical Reactions

Section: Chapter Questions

Problem 2SC

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The valence of an element is the number of covalent bonds its atoms form or the charge on the ion it forms in ionic compounds. For the following questions, use the position of an element in the periodic table to deduce its valence. (1) What is the valence of krypton? 0 (2) What is the valence of calcium? 2 (3) What is the valence of xenon? O 0
Rubidium iodide has a lattice energy of -617 kJ/mol, while potassium bromide has a lattice energy of -671 kJ/mol. Why is the lattice energy of potassium bromide more exothermic than the lattice energy of rubidium iodide?
Consider the following elements in their stable forms: Chlorine Fluorine Bromine Carbon Then for each of the following questions, enter the number listed (1-4) before the element, for elements that satisfy the criterion. Enter the number(s) in order with no separators. If none, type "none" or leave blank. (a) Which of these elements have allotropes? fill in the blank 2d8840092ffc02e_1 (b) Which of these elements exist as diatomic molecules? fill in the blank 2d8840092ffc02e_2 (c) Which of these elements exist as a metallic lattice?
(A) Balance this reaction. Then use the bond enthapies given in the table below to calculate the enthalpy of reaction for the balanced reaction. kJ/mol(B) Balance this reaction. Then use the bond enthapies given in the table below to calculate the enthalpy of reaction for the balanced reaction. kJ/mol(C) Balance this reaction. Then use the bond enthapies given in the table below to calculate the enthalpy of reaction for the balanced reaction kJ/mol
Cyanamide is a compound containing two hydrogen atoms and some amount of C and N. There are a total of 5 atoms in the compound. The products of combustion were found to be CO2, NO2, and H2O. If the enthalpy of combustion for cyanamide is – 671.9 kJ/mol and the enthalpy of formation is 58.8 kJ/mol, what is the chemical formula for cyanamide? ( ΔfH (CO2) = - 393.51 kJ/mole; ΔfH (NO2) = + 33.10 kJ/mole; ΔfH (H2O) = - 241.826 kJ/mole)
3. How many valence electrons are in a C atom? an Cl atom? (a) Write the full Lewis structure for the CH2C2 molecule. Show all lone pairs. Pert (b) Write the geometric structure for the CH2CI2 molecule and name the geometry. (c) Determine if the CH2CI2 molecule has polar or nonpolar bonds using the following electronegativity: C = 2.5, H = 2.1, CI = 3.0. Re-draw the geometric structure below, but this time include partial charges and dipole arrows for any polar bonds present. Justify your assignments for polar or nonpolar bonds.
As seen in the table, compounds containing an integer ratio of elements depend on how many cations combine with how many anions to form a stable compound. For example, in table 1, to form a NaCl compound, first Na ionizes from the Na+ cation which is having +1 positive charge, which will lose 1 electron, it is having +1 charge, this electron then goes to Cl and it will change to Cl- anion by gaining the electron, so here 1:1 ratio charge which means 1 Na+ combines with 1 Cl-1 to form NaCl. So here integer ratio is 1:1 for this sodium chloride compound. As listed in table 2, Mg(OH)2, the integer ratio is 1:2 which means, Mg is a neutral atom that loses 2 electrons and forms an Mg+2 cation, which combines with OH which gains 1 electron to form OH- anion, So here Mg2+ can combine with 2 OH- anion, so they both combine to form Mg(OH)2 which has integer ratio as 1:2 . Thus, atom forms as ions by losing or gaining electrons and combines together in whole number ratio to form stable…
Consider the following compounds: BeCl 2 , MgBr 2 , and SrBr 2 . Answer the following questions based on expected periodic trends: (a) Which is expected to have the shortest ionic bonds? (b) Which is expected to have the highest lattice energy? (c) Which is expected to have the lowest melting point?
Perchloric acid and its salts are the most stable oxyacids and oxyanions. True or false?
Please help me with this three questions
Answer the following question
2 (S 18 PERIMENT D Flame Tests: Which lon Causes the Color? Part A: Laboratory Results Summarize your laboratory results in the following data table after examining the color of the flame. Complete the table by filling in the flame test color and the missing chemical formulas, and ions (cation and/or anion). MATERIAL/COMPOUND TESTED Sodium Chloride NaCl Sodium Carbonate Strontium Acetate Copper (II) Sulfate Lithium Carbonate Potassium Sulfate Sodium Phosphate Barium Nitrate CATION PRESENT ANION PRESENT Na¹+ Na¹+ Sr2+ ㅎ CIT- CO3²- C₂H30₂¹- SO4²- CO3²- SO4²- PO4³- NO 3¹- Data detailed FLAME TEST COLOR orange greenish with a spark of crange Orange with a sparn в purple oraine outler spergi be sparvo of crange red with crant with still be due fame affranks ready bottarg Orange that arany -sparks up on greenish reatly no change oranze purple, at first a little thi turned back blue notice green crange Purple, peach red at top bright arany blue at botter Blue, Crans green Jumped different Did…

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