Select all cases in which the units comprising the solid are best classified as molecules.
CrSe
C2H2
CS2
C2H4
Cs2S
Cl2O7
None
Help please? I think they're all molecules
I would refer to a table of electonegativity, and determine the predominant bonding. Covalent bonds make molecules.
http://www.cliffsnotes.com/study_guide/Polar-Bonds.topicArticleId-21729,articleId-21679.html
does that mean covalent bonds make molecules so there for
C2H2
CS2
C2H4
Cl2O7
are the right answer
To determine whether the units comprising a solid are best classified as molecules, you need to understand what a molecule is. A molecule refers to a group of atoms held together by chemical bonds.
Now, let's analyze each compound:
1. CrSe: This compound is made up of atoms of chromium (Cr) and selenium (Se). It consists of individual atoms bonded together, so it is not a molecule.
2. C2H2: This compound is ethyne or commonly known as acetylene. It consists of two carbon atoms bonded to each other with a triple bond and two hydrogen atoms. Since the atoms are bonded together, C2H2 is a molecule.
3. CS2: This compound is carbon disulfide. It comprises one carbon atom bonded to two sulfur atoms. Again, since the atoms are bonded together, CS2 is a molecule.
4. C2H4: This compound is ethene or commonly known as ethylene. It consists of two carbon atoms bonded to each other by a double bond and four hydrogen atoms. Just like C2H2, C2H4 is a molecule.
5. Cs2S: This compound contains cesium (Cs) and sulfur (S) atoms. It is made up of individual atoms bonded together, so it is not a molecule.
6. Cl2O7: This compound is dichlorine heptoxide, which consists of two chlorine (Cl) atoms and seven oxygen (O) atoms. Since the atoms are bonded together, Cl2O7 is a molecule.
Based on the analysis:
- The compounds that are best classified as molecules are C2H2, CS2, C2H4, and Cl2O7. These compounds have atoms bonded together, forming chemical entities known as molecules.
- CrSe and Cs2S are not considered molecules since they consist of individual atoms bonded together.
Therefore, the correct answer is:
Select all cases in which the units comprising the solid are best classified as molecules: C2H2, CS2, C2H4, Cl2O7.