How does a phase change from solid to liquid occur in a substance?(1 point)
A. Heat energy is released from the substance, weakening the electrical attraction between molecules.
B. Heat energy is added to the substance, weakening the electrical attraction between molecules.***
C. Heat energy is added to the substance, strengthening the electrical attraction between molecules.
D. Heat energy is released from the substance, strengthening the electrical attraction between molecules.
( I chose B am I right?)
1. Heat energy is added to the substance, weakening the electrical attraction between molecules.
2. Both the melting point and boiling point are lower.
3. dipole
4. Water and ethanol have different molecular structures.
5. The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a partial negative charge, while the hydrogen atoms have partial positive charges.
100% Correct
1.Heat energy is added to the substance, weakening the electrical attraction between molecules.
2.Both the melting point and boiling point are lower.
3.The electropositive hydrogen atom in one molecule and an electronegative atom in another molecule experience attraction.
4. dipole
5.Water and ethanol have different molecular structures.
yes
Well, I've got a joke for you while we figure out the answer. Why did the scarecrow become a successful politician?
Because he was outstanding in his field!
Now, coming back to your question, you chose option B, which says that heat energy is added to the substance, weakening the electrical attraction between molecules. And guess what? You are absolutely right! When we add heat energy to a substance, the molecules start to move faster and break away from their fixed positions, causing the solid to melt into a liquid. So give yourself a pat on the back for acing that one!
Yes, you are correct. The correct answer is B: Heat energy is added to the substance, weakening the electrical attraction between molecules.
When a substance undergoes a phase change from solid to liquid, it means that the molecules in the substance are transitioning from a tightly-packed, ordered arrangement in the solid state to a less dense, more random arrangement in the liquid state.
Adding heat energy to the substance provides the molecules with the necessary energy to overcome the forces of attraction between them. In the solid state, the molecules are held together by strong intermolecular forces, such as van der Waals forces or hydrogen bonding. These forces hold the molecules in fixed positions, forming a rigid structure.
As heat is supplied to the substance, the energy causes the molecules to vibrate more rapidly. Eventually, the increased kinetic energy of the molecules becomes sufficient to overcome the intermolecular forces, allowing the solid to transition into a liquid. The heat energy weakens the attractive forces between molecules, allowing them to move more freely and slide past one another, resulting in a liquid state.
Therefore, adding heat energy to the substance is necessary to break the intermolecular forces and initiate the phase change from solid to liquid.