Covalent bonding Flashcards
(43 cards)
What is the difference between covalent bonds and ionic bonds?
In covalent bonds, the electrons are shared between atoms, while in ionic bonds, electrons are transferred from one atom to another.
What is represented by a short straight line between two atoms?
A short straight line between two atoms represents a covalent bond.
True or False?
Simple covalent molecules conduct electricity.
False.
Simple covalent molecules do not conduct electricity as they do not contain free electrons.
What is a covalent bond?
A covalent bond is a type of chemical bond where atoms share pairs of electrons with each other.
What are intermolecular forces?
Intermolecular forces are the weak forces of attraction that exist between individual molecules in a covalent substance.
True or False?
Covalent bonds involve the transfer of electrons.
False.
Covalent bonds involve sharing electrons, not transferring them.
What type of materials form a covalent bond?
The materials that form covalent bonds are non-metals.
Where is the strong electrostatic attraction in a covalent bond?
The strong electrostatic attraction in covalent compounds is between the shared pair of electrons and the nuclei of the atoms involved.
What makes each atom more stable in a covalent bond?
Sharing electrons in the covalent bond allows each atom to achieve an electron configuration similar to a noble gas.
What is formed when a group of two or more atoms covalently bond together?
A compound / molecule is formed when a group of two or more atoms covalently bond together.
True or False?
Dot and cross diagrams can represent giant covalent structures.
False.
Dot and cross diagrams are used to represent only small covalent molecules with a fixed number of atoms.
What are simple molecules?
A simple molecule is a small covalent molecule with a fixed number of atoms, such as H2, Cl2, H2O, NH3, and CH4.
What do dots and crosses represent in a dot and cross diagram?
In a dot and cross diagram, dots and crosses represents electrons.
What are diatomic molecules?
Diatomic molecules are molecules composed of two atoms, such as H2, Cl2, O2, and N2.
What are inorganic molecules?
Inorganic molecules are simple molecules that do not contain carbon atoms, such as H2O and NH2
Name three inorganic molecules that you should be able to draw dot-and-cross diagrams for.
Three inorganic molecules that you should be able to draw dot-and-cross diagrams for are:
Water
Ammonia
Carbon dioxide
What is the difference between simple covalent molecules and giant covalent structures?
Simple covalent molecules are small and can be separated into individual molecular units without breaking any chemical bonds.
Giant covalent structures are huge continuous networks of atoms that cannot be separated into individual units without breaking bonds.
True or False?
You can be expected to draw dot-and-cross diagrams for the the diatomic molecules hydrogen, oxygen, nitrogen, halogens and hydrogen halides.
True.
You can be expected to draw dot-and-cross diagrams for the the diatomic molecules hydrogen, oxygen, nitrogen, halogens and hydrogen halides.
What is an organic molecule?
An organic molecule is a simple molecule that contains carbon and hydrogen atoms, such as CH4, C2H6, and C2H4.
How many carbon atoms (at this level) can be included in dot-and-cross diagrams?
Up to 2 carbon atoms can be included in dot-and-cross diagrams (at this level).
So, diagrams for methane, ethane, ethene and similar compounds with halogen atoms.
True or False?
Simple molecular structures have high melting and boiling points.
False.
Simple molecular structures have low melting and boiling points.
What is the difference between covalent bonds and intermolecular forces?
Covalent bonds are strong bonds that hold atoms together within a molecule, while intermolecular forces are weak attractive forces that exist between different molecules.
True or False?
Covalent compounds are good conductors of electricity.
False.
Covalent compounds are poor conductors of electricity.
What are simple molecular structures?
Simple molecular structures are small molecules with covalent bonds, which have weak forces between the molecules (intermolecular forces).
