What is the net iconic charge of an oxygen ion?

What is universal indicator? What is its advantage?

The table below describes the temperature of different colors of stars. Color Temperature red under 3,500 K orange-red 3,500 - 5,000 K white-yellow 5,000 - 6,000 K blue-white 6,000 - 7,500 K blue 7,500 - 25,000 + K If the Sun is white-yellow, which

Which one of the following represents a decrease in entropy? a) The evaporation of perfume. b) The sublimation of carbon dioxide. c) The melting of ice. d) The condensation of steam on a kitchen window.

Determine the number of atoms in 1.75 ml of mercury. (the density of mercury is 13.5 g/ml.)

Consider a 1.24 g mixture of magnesium nitrate and magnesium chloride. After dissolving this mixture in water, 0.500 M silver nitrate is added dropwise until precipitate formation is complete. The mass of the white precipitate formed is 0.419 g.

5. Identify a suitable method that would be used to separate mixture of the follow [b]Water and ethanol c]Table salt dissolved in water d] iodine and potassium Pul the table below

How much energy is needed to convert 57.3 grams of ice at 0.00°c to water at 75.0°c? specific heat (ice) = 2.10 j/g°c specific heat (water) = 4.18 j/g°c heat of fusion = 333 j/g heat of vaporization = 2258 j/g?

A certain first-order reaction (A→productsA→products) has a rate constant of 9.90*10-3 s-1s-1 at 45 ∘C∘C. How many minutes does it take for the concentration of the reactant, [A][A], to drop to 6.

Assign the oxidation number for (NH4) 3PO4

When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place?