2. Chemistry

Covalent Bonds

What Are Covalent Bonds

Nature of Covalent Bonds

Bonds between two atoms that are equally or similarly electronegative are ________.

Which of these molecules would you predict to have the largest number of polar covalent bonds based on their molecular formulas?
a. C2H6O (ethanol)
b. C2H6 (ethane)
c. C2H4O2 (acetic acid)
d. C3H8O (propanol)


Animation: Nonpolar and Polar Molecules

 the two atoms sharing electrons are equally electronegative 

 No. This would not result in a polar covalent bond. 

 it is between two atoms that are both very strong electron acceptors 

 No. This would not necessarily result in a polar bond. 

 the two atoms sharing electrons are of the same element 

 No. In this instance the two atoms would have equal attraction for electrons. 

 one of the atoms sharing electrons is much more electronegative than the other 

Consider the electronegativity of the atoms involved in a polar covalent bond.

A covalent bond is likely to be polar if __________.

The bonded atoms share electrons unequally. 

The bonded atoms share electrons equally. 

The bonded atoms have equal electronegativities. 

The bonded atoms have unequal electronegativities. 

What makes a covalent bond nonpolar?a) The bonded atoms share electrons unequally.b) The bonded atoms share electrons equally.c) The bonded atoms have equal electronegativities.d) The bonded atoms have unequal electronegativities.e) a and d only.f) b and c only.

Polar Covalent Bonds

Covalent Bonding Of Hydrogen, Oxygen & Nitrogen | Properties of Matter | Chemistry | FuseSchool

Covalent Bonding Animation

 No. Ionic bonds are formed between ions. 

 No. Hydrogen bonds are formed between the slightly positive end of one polar molecule and the slightly negative end of another polar molecule. 

 No. Although electronegativity plays a part in chemical bonding, there is no such thing as an electronegative bond. 

What is the strongest type of bond?

When one or more pairs of valence electrons are shared by two neutral atoms, what type of bond is formed?

The following predictions ask you to consider how genetic regulatory cascades provide positional information. Select True or False for each statement.
T/F Mutation of a gene at one level of a regulatory cascade will affect the expression of genes at all levels of the cascade.
T/F Mutation of a gene that is expressed later in a regulatory cascade will affect a smaller region of the body than mutation of gene that is expressed early in the cascade.
T/F In the regulatory cascade used by Drosophila, a gene at one level of the cascade will be controlled only by genes at the level immediately above it.
T/F Genes that control the largest regions of the Drosophila embryo are not transcribed in the embryo.

The bond is not important to living cells. 

One of the atoms has a partial negative charge. 

If a covalent bond is polar: &nbsp;a) Electrons are not shared by atoms.b) Protons are shared by atoms.c) The bond is not important to living cells.d) One of the atoms has a partial negative charge.e) The bond is not a strong bond.

Covalent bonds | Molecular and ionic compound structure and properties | AP Chemistry | Khan Academy

Nonpolar Covalent Bonds

Animation: Covalent Bonds

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound.
a. HS
b. HS2
c. H2S
d. H4S

The hydrogens and oxygen of a water molecule are held together by ______ bonds.

Chemical Bonding - Ionic vs. Covalent Bonds

Atomic Hook-Ups - Types of Chemical Bonds: Crash Course Chemistry #22

When two atoms share a pair of electrons, the bonding is referred to as:a) Ionic.b) Covalent. &nbsp; &nbsp;&nbsp;c) Unstable. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;d) Hydrogen. &nbsp; &nbsp;&nbsp;e) Polar.

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