题目难度:一般 考点分析:考查ionic compound(离子化合物)的dot-and-cross diagram(电子式) 题目分析:magnesium chloride是ionic compound, 发生了electrons的transfer(转移),而不是share(共享),所以A和B排除。而magnesium (Mg) 属于group 2的element,所以其ion是+2价。故而答案选D。 今天的题目讲解就先到这里了。...
In doing so, two pairs of electrons are shared between the two oxygen atoms, and a double covalent bond is formed. We can represent the oxygen molecule formed using either the ‘dot-and-cross’ diagram (shown on the left) or the structural formula (shown on the right). In the ...
(ii)Drawa‘dot-and cross’diagram to represent the bonding in the hydrogen cyanide molecule. Show the outer shell electrons only.[1] (iii)State the hybridisation of the carbon and nitrogen atoms in hydrogencyanide, and give the H–C–N bond angle. hybri...
Hi, please try drawing the dot and cross diagrams of - P2O5 - N2O5 - NOCl - NO - NO2 - C3O - C2O3 - C2O - N2O2 - N2O These molecules are related to H2 Chemistry Exam Papers Question. All the best! Post a Comment Read more ...
Give one limitation of using a dot and cross diagram to represent an ammonia molecule. does not show the shape Explain why ammonia has a low boiling point.You should refer to structure and bonding in your answer. - ammonia has a simple molecular structure- ammonia has weak intermolecular force...
AND UNITS 31 MATHEMATICAL REQUIREMENTS 32 GLOSSARY OF TERMS 33 DATA BOOKLET 36 PERIODIC TABLE 46 TEXTBOOKS 47 9647 H2 CHEMISTRY (2013) INTRODUCTION Candidates will be assumed to have knowledge and understanding of Chemistry at O level, as a single subject or as part of a balanced science course...
select article Carbon Dot-Modified ferrite (CDs@ZF): Efficient Visible-Light photocatalyst for dye degradation and antibacterial activity Research articleAbstract only Carbon Dot-Modified ferrite (CDs@ZF): Efficient Visible-Light photocatalyst for dye degradation and antibacterial activity Tahmeena Akhter, ...
Computer Based Lab Lewis Dot Structure Electrochemistry Limiting agents Electron orbitals Links I (More Links) Elements Links II (More Links) Empirical formulas Mass Endothermic Math for Chemistry MathCAD for Chem. Software Chem. Matter Solid State Chemistry Metals Solubility Metric system Solution...
select article The remarkable enhancement of photo-stability and antioxidant protection of lutein coupled with carbon-dot Research articleAbstract only The remarkable enhancement of photo-stability and antioxidant protection of lutein coupled with carbon-dot Da-jian Jv, Tian-hao Ji, Zhemi Xu, Ao Li,...
Loftsson T, Magnusdottir A, Masson M, Sigurjonsdottir JF (2002) Self-association and cyclodextrin solubilization of drugs. J Pharm Sci 91:2307–2316 Article CAS Google Scholar Messner M, Kurkov SV, Brewster ME, Jansook P, Loftsson T (2011) Self-assembly of cyclodextrin complexes: aggrega...