Explanation:
(a) The mass of an object remains the same always. It is independent of its location. In this case, an iron nail is ground into powder. It means that its mass will remain unchanged. Hence, (a) is the correct option.
(b) Whenever there is a change of color of an object, a chemical reaction occurs. It shows that a reaction happens there. In this problem, a paper turns yellow-brown upon exposure to sunlight. A chemical reaction takes place there. Hence, (b) is the correct option.
<span>An Inference Is An Idea Or Conclusion Thats Drawn From Evidence And Reasoning. An Inference Is Also An Educated Guess.</span>
Reacting with metals is not a common property of bases. Bases do however react with acids.
Perhaps the most important attitude is curiosity. Curiosity a state of active interest or genuinely wanting to know more about something allows you to embrace unfamiliar circumstances, giving you a greater opportunity to experience discovery and joy. Indeed, studies show that life is better when you're curious.
