18. Which statement explains why ionic compound has high melting point? B A Covalent bond between atoms is strong B Electrostatic force between ions is strong C There are free moving ions in the compound D More energy is needed to overcome the force between molecules 相关知识点: 试题来源:...
How to determine if a bond is covalent or ionic?What is a covalent bond produced by sharing two pairs of electrons between two atoms called?How does an ionic bond differ from a covalent bond?Which of the following best describes an ionic bond? (a) An ionic bond involves two me...
7 The compound formed between elements X and Y is ionic.Which statement about elements X and Y is correct? D A X and Y are both at the left-hand side of the Periodic Table. B X and Y are both at the right-hand side of the Periodic Table. C X and Y are both transition elements...
Which of the following best describes an ionic bond? (a) An ionic bond involves two metals that exchange electrons. (b) An ionic bond involves two nonmetals that share electrons. (c) An ionic bond involves a metal that shares elect...
PROBLEM TO BE SOLVED: To provide a method for producing a cellulose film, which becomes an alternative method of a prior viscose method and by which strength is imparted to the cellulose film after film formation by stretching.林 蓮貞
An aqueous mixture containing starch (a colloid), NaCl, glucose, and albumin (a colloid) is placed in a dialyzing bag and immersed in distilled water. Which of the following correctly describes the lo To study a marine organism, a biologist prepa...
Method for separating glass comprises producing a linear crack on the glass, subjecting the crack during or after its formation with an aqueous liquid, which contains an organic ionic compound consisting of a cation with a positively charged nitrogen atom and a hydroxyl ion as anion and separating...
To solve the question regarding the types of energies involved in the Born-Haber cycle, we will break down the process step by step.1. Understanding the Born-Haber Cycle: - The Born-Haber cycle is a thermodynamic cycle that
describes the preparation of nonionic surface-active agents by a polyaddition of glycidol to alkanediols or to alkyl mercaptans, with alkaline catalysis. This process uses isolated and purified glycidol, a costly raw material, which is difficult to obtain on an industrial scale. In addition, its...
2, 1977, describes photopolymerizable compositions which contain ethylenically unsaturated diester polyhydroxy polyethers, useful for printing plates, which also contain alkali-soluble copolymer resin capable of being addition-polymerized with the diester through a photochemical reaction. ...