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Chemistry Chapter 6
Chemical Bonds
Question | Answer |
---|---|
Chemical bonds form as a result of the attraction of what for what? | Nuclei for electrons |
What is a covalent bond? | sharing of electron pairs between two atoms |
What is an ionic bond | electrical attraction between large numbers of cations and anions |
What defines if a bond is ionic or covalent? | The electronegativity subtracted from the other electrons electronegativity. Higher then 1.7=ionic and less then 1.7= covalent |
What electrons are available for forming a chemical bond? | valence electrons |
What can we say about the potential energy of a chemical compound, compared to the atoms from which it was made? | Potential energy is usually lower then the energy of the reactants |
What determines if a covalent compound is polar or non- polar? | Polar- 0.3 to 1.7 Non- Polar- 0- 0.3 |
What is the octet rule? | Chemical compouds form so that each atom by gaining, losing, or sharing electrons, has an octet of electrons in its highest occupied energy level. |
What is a molecule? | neutral group of atoms held together by covalent bonds. |
What are bond length and bondy energy? | Bond length- average distance between two atomsBond energy- energy used to seperate a chemical bond and make neutral isolated atoms |
What type of bond is found in a molecule? | colvalent |
What is a diatomic molecule? | Molecule containing only two atoms |
What are the elements that always exist as a diatomic molecule? | Hydrogen, nitrogen, oxygen, flurine, chlorine, bromine, iodine |
What is a double bond? a triple? | double- sharing of two pairs of electrons b/w 2 atomstriple- sharing of 3 pairs of electrons b/w 2 atoms |
How do the properties of ionic compounds compare to molecular compounds? | Ionic- solid, brittle, high melting pointCovalent- gas, liquid, low melting point |
What is lattice energy? | energy released when one mole of an ionic crystalline compound is formed from gaseous ions |
Whats the difference between an ionic formula and a molecular formula? | Ionic- electrons gained or lost bond forms between opposite charged ionsCovalent- a pair of electrons is shared |
What is a polyatomic ion? | covalently bonded group of atoms with a charge |
What is the primary characteristic of metallic bonding? | sea of electrons |
How does metallic bonding relate to the fact that a metal is malleable and can conduct electricity? | Electrons are free to move, so metal can be shared without breaking any bonds. Electrons can travel freely through metal making a current. |
What does VSEPR stand for? | valence-shell, electrons-shared repulsion |
VSEPR is based on what property of electrons? | negative charges will reple |
How do unshared pairs of electrons affect the shape of a molecule? | Unshared electrons will repel other electrons the same as if they were shared electrons. |
Based on VSEPR theory, whats the shape of an AB2 molecule? AB3? AB4? AB3E? AB2E2? | AB2- linearAB3- trigonal planarAB4- tetrahedralAB3E- trigonal pyramidalAB2E2- Bent |
What are the hybrid orbitals that are formed for an AB2 molecule? AB3? AB4? AB3E? AB2E2? | AB2- sAB3- sp2AB4- sp3AB3E- sp3AB2E2- sp3 |
What does sp3 mean? | a hybrid orbital made from one s orbital and 3 p orbitals |
Which is stronger, intermolecular forces or chemical bonds? | Chemical bonds |
What causes a dipole in a chemical bond? | one electron has a higher electronegativity than the other. |
What is a dipole- dipole force? | Forces of attraction b/w polar molecules. |
How do you determine if a molecule is polar? | If polarities of the dipoles in the individual bonds are asymmetrical and tend to point in one direction. |
What is a hydrogen bond? | a intermolecular force where a hydrogen atom is attracted to an unshared pair of electrons of an electron negative atom in a molecule nearby. |
Why is a hyrdrogen bond stronger than most other intermolecular forces? | nearly full positive charge on the hydrogen atom is strongly attached to the negative charge of the unshared electron. |
What are LLondon Dispersion forces? | Weak intermolecularattractions because of the constant move of electrons andd creation of instaneous dipoles. |