Students are measuring the pH of different substances. Their hypothesis is that cola will be the most acidic material that is tested. The following procedure is used: 1. Place 100 milliliters (ml) of cola, lemon juice, liquid soap, and milk in individual 500 ml beakers.
2. Test the pH of the material at room temperature.
3. Record the data

Which change to the procedure would make the results more accurate?

-test each material multiple times
-increase the amount of each sample
-complete the trials at different times
-conduct the trials at different temperatures

it's filtration, but this is an assumption so my apologies if i got this

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.