pH is a scale used to measure the acidity or
alkalinity of an aqueous solution. It can be used to calculate the amount of
hydronium ions in the solution. It is expressed as the negative logarithm to
the base 10 of the concentration.
<span> </span><span>pH = -log [H+]</span>
<span>pH= -log [4.5 x 10^-3]</span>
pH = 2.35
Answer:
Magnetic property
Explanation:
Iron filling is a magnetic compound, unlike the salt crystals. This means they are attracted by magnets.
To separate a mixture of iron filling s and salt crystals, a magnet should be used to remove the iron fillings from the mixture.
The choices for this problem are bismuth, Bi; platinum, Pt; selenium, Se; calcium, Ca and copper, Cu. I think the correct answer would be selenium. The melting point of bismuth is at a temperature of 544.4 Kelvin. At a temperature of 525 K, it would exist as solid. Platinum melts at 2041.1 K. At 525 K, platinum would be in solid form. Selenium has a melting point at 494 K so that at a temperature of 525 K, it would exist in its liquid state. Calcium has a melting point of 1112 K so it would exist as solid at 525 K. Copper has a melting point at 1358 K, so it would still exist as solid at a temperature of 525 K. Therefore, the answer would only be selenium.
Answer:
different sizes of the parachute
Explanation:
this is what is being changed throughout the experiment
I don’t see what you need help with but thanks:)
