Answer:
The correct answer is d. As the chocolate bar changes from a solid to a liquid the particles move around more.
Explanation:
When a chocolate bar melts, it suffers a <u>physical</u> change: a change of state from solid to liquid. In the liquid state, the particles move around more, because they have more kinetic energy (more velocity) and more freedom to move than in solid state. Thus, as the solid became into a liquid, the particles move more.
Answer:
It can create a new plant variety, cure diseases or like the current epidemic situation, vaccines, drugs, ...
Explanation:
3Mg + 2H3(PO4) —> Mg3(PO4)2 + 3H2
I think
Answer:
Hard-boiled eggs can be preserved up to 7 days in the refrigerator.
Explanation:
The last one should be right