How is a mineral's effervescence measured?

scraping it against an unglazed porcelain plate

dripping acid onto it

placing it near iron filings

striking it with a hammer

When 10.1 g of an unknown, non-volatile, non-electrolyte, X was dissolved in 100. g of benzene, the vapor pressure of the solvent decreased from 100 torr to 87.7 torr at 299 K. Calculate the molar mass of the solute, X.

Which location of the moon relative to the sun and earth may produce a warning (getting smaller nightly) half moon

How much heat is required, in calories, to raise the temperature of 57.8g of silver from 17.0oC to 43.5oC, if the specific heat of silver = 0.057cal / goC?

What mass of sucrose (C12H22O11) should be combined with 488 g of water to make a solution with an osmotic pressure of 8.00 atm at 290 K? (Assume the density of the solution to be equal to the density of the solvent.)

Assuming the metals lose all their valence electrons, and the nonmetals gain electrons to complete the s-p subshells, which listing below shows the correct information for the element?

Brianna wanted to compare the densities of two different solids of the same size 6cm3 (same volume) to see which one was more dense. Solid A had a mass of 2 grams and Solid B had a mass of 0.5 grams.

Which type of bond is present within a water molecule

Every oxygen atom has 8 electrons. what can you learn from the electron configuration of oxygen

If there is a loss of 5.63 x 10 - 7 kg of mass in a nuclear reaction, how many joules of energy would be released? Recall that C equals 3 times 108 m / s.

Why is it important that scientific knowledge changes?