Diya tests a sample of a mineral by rubbing it on a piece of white tile. She observes a yellow mark. What property of minerals is she testing? 1.)streak
2.)luster
3.)hardness
4.)cleavage

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

the ratio of the conjugate base to the acid required to attain the desired ph.

i'm wiling to try and you : )