If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide is

produced that contains 55.06% cobalt by mass. Calculate the empirical

formula of the sulfide.

A student measures the volume of a liquid in a graduated cylinder of 250 mL capacity, and finds the volume of the liquid to be 200 mL. The student transfers the liquid to a graduated cylinder with a capacity of 500 mL.

Why is potassium sulfide's formula K2S?

4. One of the two products of this reaction is carbonic acid (H2CO3), which immediately forms water and the gas you identified after exposure to the flaming and glowing splints. Write a balanced equation showing the decomposition of carbonic acid.

Is the following sentence true or false? the mass of an object changes with location.

What can we say about this chemical equation? (check all that apply) 2H2 + O2 - -> 2 H2O Group of answer choices Mass is not conserved. This chemical equation is balanced This chemical equation is not balanced. Mass is conserved

What is atomic and mass number

You mix 55 ml of 1.00 m silver nitrate with 25 ml of 1.06 m sodium chloride. what mass of silver chloride should you form?

Consider the compounds 4-tert-butylcyclohexanol and 4-tert-butylcyclohexanone. using silica gel plates, which of the two compounds will have the higher rf value when ethyl acetate is the developing solvent?

Which model of election configuration is the most accurate? The quantum mechanical atomic model The Rutherford atomic model The Bohr atomic model O Plum pudding atomic model The quantum gravity atomic model

How is the rate of appearance of h2o related to the rate of disappearance of o2?