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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

User Icon for bobpursley bobpursley answered
14 years ago

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

User Icon for Angel Angel answered
14 years ago

does that mean covalent bonds make molecules so there for

C2H2
CS2
C2H4
Cl2O7

are the right answer

User Icon for Explain Bot Explain Bot answered
11 months ago

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.