Determine if it is polar or non-polar molecule:

C3H6O
C2H5OH
SiCl4
NH3
CO2
C3H8
H2O
N2

My ans are:
Polar
Polar
Polar
Nonpolar
polar
Nonpolar

are my answers correct????

Polar

Polar
Polar
polar
Nonpolar
nonpolar
polar
Nonpolar

To determine if a molecule is polar or non-polar, you need to consider its molecular geometry and the polarity of its individual bonds.

Here's how to determine the polarity of each molecule you listed:

C3H6O: To determine its polarity, you need to draw the Lewis structure and consider the molecular geometry. In this case, C3H6O is acetone. The C=O bond is polar due to the difference in electronegativity between carbon and oxygen. Additionally, the overall molecular geometry of acetone, which is trigonal planar, results in a net dipole moment, making it a polar molecule.

C2H5OH: This is ethanol. The C-O bond is polar, and the molecular geometry of ethanol is also trigonal planar, resulting in a net dipole moment. So, it is a polar molecule.

SiCl4: Silicon tetrachloride is composed of four Cl atoms bonded to a central silicon atom. The molecule has a tetrahedral geometry, which results in an equal distribution of the dipole moments, canceling each other out. Thus, SiCl4 is a nonpolar molecule.

NH3: Ammonia has a pyramidal shape with a lone pair of electrons on nitrogen. Due to the electronegativity difference between nitrogen and hydrogen, the N-H bonds are polar. The molecular geometry and the presence of the lone pair result in a net dipole moment, making it a polar molecule.

CO2: Carbon dioxide has a linear molecular geometry with two polar C=O bonds. However, the dipole moments of the two bonds cancel each other out, resulting in a nonpolar molecule.

C3H8: Propane has a tetrahedral molecular geometry with only C-H bonds. Carbon-hydrogen bonds have relatively similar electronegativities, so the molecule is nonpolar.

H2O: Water has a bent molecular geometry due to the presence of two lone pairs on the oxygen atom. The O-H bonds in water are polar, and the shape of the molecule results in a net dipole moment, making it a polar molecule.

N2: Nitrogen gas consists of two nitrogen atoms bonded by a triple bond. Both nitrogen atoms have the same electronegativity, resulting in equal sharing of electrons and no molecular dipole moment. Therefore, N2 is a nonpolar molecule.

Based on the explanations above, your answers should be:

C3H6O: Polar
C2H5OH: Polar
SiCl4: Nonpolar
NH3: Polar
CO2: Nonpolar
C3H8: Nonpolar
H2O: Polar
N2: Nonpolar

Your answers for C3H6O, C2H5OH, SiCl4, NH3, CO2, and C3H8 are correct, but your answer for H2O is incorrect. H2O is a polar molecule, not nonpolar.

Your answers are not entirely correct. Here's the correct classification for each molecule:

C3H6O: Polar
C2H5OH: Polar
SiCl4: Nonpolar
NH3: Polar
CO2: Nonpolar
C3H8: Nonpolar
H2O: Polar
N2: Nonpolar

Overall, you identified most of the molecules correctly. However, C3H6O (acetone) and C2H5OH (ethanol) are polar molecules, not nonpolar. Keep in mind that polar molecules have an uneven distribution of charge, while nonpolar molecules have an even distribution of charge.