The number of deaths attributed to cigarette smoking outweighs all other factors, whether voluntary or involuntary, as a cause of death. Since the late 1970s, when daily smoking among high school seniors reached 30 percent, smoking rates among youth have declined. While the decline is impressive...
百度试题 结果1 题目Ifthereisonlyonecovalentbondbetweentwoatoms,itisσbond.A.正确B.错误 相关知识点: 试题来源: 解析 正确 反馈 收藏
Which covalent bond is the most polar? a. {eq}\rm O-F {/eq}. b. {eq}\rm B-F {/eq}. c. {eq}\rm F-F {/eq}. d. {eq}\rm Cl-F {/eq}. Polar Covalent Bond: A covalent bond is a chemical bond in which electrons are mutually shared by the two...
What is a double covalent bond?Bonds, Chemical BondsVery few substances exist as pure elements in nature. The reason for this is that most elements do not have a stable arrangement of electrons in their outermost energy shell. To get closer to this ideal arrangement, most elements combine ...
Polar covalent bond or polar bond is a covalent bond with greater electron density around one of the two atoms
百度试题 结果1 题目1 Which is the shortest covalent bond? A A H-H□ B H -N C H-S D H -Br 相关知识点: 试题来源: 解析 A 反馈 收藏
A single covalent bond between two atoms generally allows the rotation of one part of a molecule relative to the other around the bond axis. A double bond prevents such rotation, producing a more rigid and less flexible arrangement of atoms. 相关知识点: 试题来源: 解析 正确 反馈 收藏 ...
Many enzymes use one or more cofactors, such as biotin, heme, or flavin. These cofactors may be bound to the enzyme in a noncovalent or covalent manner. Although most flavoproteins contain a noncovalently bound flavin cofactor ...
A chemical bond formed when two atoms share one pair of electrons is a bond; it is best described as. a) double; covalent b) double; ionic c) single; covalent d) single; ionic e) triple; covalentClassify the bonding between the following pairs of atom...
百度试题 结果1 题目Which of the following molecules contains a polar covalent bond? A. O\_\_\__{2}\ \ B. H\_\_\__{2}\ \ C. co D. N\_\_\__{2}\ \ 相关知识点: 试题来源: 解析 C 反馈 收藏