I dont know what the statements are but concave lens are thinner in the middle which cause light to diverge or scatter
The answer is B.
A cannot be the answer is melting is a physical change. No chemical reaction took place.
B is the answer as it is a EXOTHERMIC REACTION so heat will be given off.
C cannot be the answer as dissolving is basically atoms becoming ions, not a chemical reaction whereby a reactant reacts with another reactant to form a product.
D cannot be the answer. Same reason as for why A is not the answer.
Cheers.
Answer:
there will be no cracks so the trash won't get stuck
We have no idea. We need to examine the experimental set-up. You've given us no information, except that there may have been some sort of collision.
Oxidation number is the charge.
