MYTUTOR SUBJECT ANSWERS

418 views

Types of chemical bonds

Ionic bond- this is an electrostatic force of attraction between two oppositely charged ions, i.e. a positively charged ion and a negatively charged ion. 

Covalent bond- this is a bond where electrons are shared between atoms. This is an intramolecular force- it is between atoms in the same molecule.

van der Waals force- this is a weak force between molecules. Its increases with the mass of the molecules. It is an intermolecular force (between molecules).

Hydrogen bond- these are bonds of electrostatic attraction between molecules (or part of molecules) with a dipole, in which one of the atoms is hydrogen. A dipole is where the electrons in a covalent bond are not shared equally between the atoms. The atom with more protons (i.e. the heavier atom) pulls the electrons towards it, giving itself a more negative charge and the other atom (in this case hydrogen) a more positive charge. A typical example of a molecule with a dipole, that undergoes hydrogen bonding, is water. The hydrogen atoms in water are more positively charged and the oxygen atoms are more negatively charged. This creates electrostatic forces of attraction between negatively charged oxygen atoms and positively charged hydrogen atoms which are in different water molecules.

Dipole-dipole forces- these are bonds of electrostatic attraction between molecules (or part of molecules) with a dipole. A dipole is where the electrons in a covalent bond are not shared equally between the atoms. The atom with more protons (i.e. the heavier atom) pulls the electrons towards it, giving itself a more negative charge and the other atom a more positive charge. This creates electrostatic forces of attraction between negatively charged atoms and positively charged  atoms which are in different molecules.

Metallic bond- metals are made of rows of atoms in a regular arragement. The theory is that the nuclei (i.e. protons and neutrons) of the atoms remain in this regular arrangement, but that the electrons are free to move throughout the structure of the metal. The free-moving electrons are known as a "sea of electrons". The metal structure is held together by forces of electrostatic attraction between the positively charged metal nuclei and the negatively charged free-moving electrons. The free moving electrons also enable various metals to conduct electricity.

Lizzie B. A Level Chemistry tutor, A Level Biology tutor, A Level His...

2 years ago

Answered by Lizzie, who tutored A Level Chemistry with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

88 SUBJECT SPECIALISTS

£30 /hr

Anh-Duong V.

Degree: Medicine (Bachelors) - Bristol University

Subjects offered: Chemistry, Science+ 4 more

Chemistry
Science
Extended Project Qualification
Biology
-Personal Statements-
-Medical School Preparation-

“My name’s AD and I’m a medical student at Bristol. I worked hard at my A-levels and didn’t always find them easy, which enables me to understand the frustration of trying to process difficult concepts. My teaching style is approachabl...”

£26 /hr

Osama H.

Degree: Medicine (MBBS/BSc) (Bachelors) - Imperial College London University

Subjects offered: Chemistry, Geography+ 4 more

Chemistry
Geography
Biology
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-

“Hi I'm Osama, a medical student at Imperial College London. I'm happy to help with core subjects at GCSE, and Biology and Chemistry and A-level. I am also happy to help you get that coveted place at medical school!”

£22 /hr

Oliver P.

Degree: Biology (Masters) - Bristol University

Subjects offered: Chemistry, Science+ 5 more

Chemistry
Science
Maths
Human Biology
Further Mathematics
Extended Project Qualification

“The tutor: I am a Biology MSci student at Bristol University and have a deep curiosity and passion for multiple fields of science and technology. I am patient and have a lot of experience teaching children in the age range of 11-...”

About the author

Lizzie B.

Currently unavailable: for regular students

Degree: Natural Sciences (Masters) - Cambridge alumni University

Subjects offered: Chemistry, Maths+ 3 more

Chemistry
Maths
History
Biology
-Personal Statements-

“Cambridge/Imperial science graduate looking to share my enthusiasm and experience in science by tutoring to GCSE/A-level. I can also help with university applications/personal statements.”

You may also like...

Posts by Lizzie

Microbiological techniques- gel electrophoresis

Political spectrum

Types of chemical bonds

What is a virus?

Other A Level Chemistry questions

At what temperature does the reaction become feasible? When ΔH = 492.7 kJmol^-1 and ΔS = 542.6 JK^-1mol^-1.

In terms of Electrostatic Forces, Suggest why the ‘Electron Affinity’ of Fluorine has a Negative value.

What is Le Chatelier's principle?

How do you calculate the pH of a weak acid?

View A Level Chemistry tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok