Answer:
Glaciers moving rocks and soil through a valley
Explanation:
The definition of Erosion is "the process of eroding or being eroded by wind, water, or other natural agents". Which in turn means the movement of glaciers is causing erosion on the local valley.
Answer:
Gas B
Explanation:
diffusion/effusion increases when:
- Temperature increases
- A gas has lower molar mass
- Particles are moving quickly
diffusion/effusion decreases when:
- Temperature decreases
- A gas has higher molar mass
- Particles are moving slowly
Hence: since gas B has the lowest molar mass, it has the highest rate of effusion
I also took the test so I know it is right
Answer:
Explanation:
To determine whether a covalent compound contains polar bonds you must deal with dipole moments and symmetry.
If a molecule has dipole moments and the charge is not symmetrically distributed then the covalent ompound is polar.
This is the analysis for the given compounds.
- First of all, AlCl₃ is an ionic compound, because the difference of electronegativities between Al (a metal) and Cl (a nonmetal) atoms is large enough to gender the formation of ions.
- CO₂: since C and O are two nonmetals, with different electronegativities, each C=O bond is polar. Nevertheless, it is a planar molecule (its geometry is O = C = 0) , so the molecule is completely symmetric, and the dipole moments of each C=O pair are cancelled. So, this is not a polar molecule.
- The structure of OCl₂ is similar to that of water (H₂O). So, it is not planar but bended. The bent geometry is due to the lone pairs on the oxygen. Also, due to steric repulsion between the relatively large chlorine atoms the bond angle is a bit larger than the normal angle. While for the H₂O molecules the bond angle is about 104.45°, it is about 110.9° for OCl₂. Then, being it bended, the dipole moment do not cancel and the molecule is polar.
Answer:
b molecular orbital therory