Answer:
The answer to your question is letter A
Explanation:
A Molecular compound definition is a compound where the atoms share electrons, which means that these compounds have covalent bonds.
Nonmetals are attached by covalent bonds.
A. This compound has 2 nonmetals so it is an example of a molecular compound.
B. This compound has metal and nonmetals so this is an ionic compound.
C. This compound has metal and nonmetals it is also an ionic compound.
D. Potassium is a metal, oxygen and hydrogen nonmetals, it is an ionic compound.
E. Incorrect
Answer: Increases.
Explanation: As the temperature of a liquid or solid increases its vapor pressure also increases. Conversely, vapor pressure decreases as the temperature decreases.
Answer: A polar bond is a covalent bond between two atoms where the electrons forming the bond are unequally distributed.
Example: A water molecule, abbreviated as H2O, is an example of a polar covalent bond. The electrons are unequally shared, with the oxygen atom spending more time with electrons than the hydrogen atoms.
Explanation:
Boiling water:water heats up and bubbles physical change
Baking a cake: starts to cook into bread chemical change
Burning wood: turns into ash and burned wood chemical change
Painting a door: door changes color physical change