A nickel coin is a mixture of metals called an alloy. It is 75% copper and 25% nickel. Design and conduct an experiment to find out how many nickel and copper atoms there are in one 5 cent coin.

Iknow #2 is d. i just need to know why

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?