You can find the ph of a substance by using
a. plain paper.
b. a thermometer.
c. litmus indicator.
d. a conductivity tester.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium