how does mass change during a chemical reaction

Based on the information here, if 220 grams of the salt KBr are added to 100 mL of water at 100oC, explain how we would label that solution. A) insoluble B) supersaturated C) saturated D) unsaturated

What happens in an oxidation half-reaction? A. Elements gain electrons. B. Elements lose electrons. C. Oxygen is added. D. Oxygen is lost.

Explain how you determine the number of valence electrons that should be used in the dot structure for silicon dioxide and state the shape of the molecule.

As a reaction proceeds, one mole of reactant equals: A) three units of a balanced chemical equation B) two units of a balanced chemical equation C) four units of a balanced chemical equation D) one unit of a balanced chemical equation

Which of the following statements is (are) true? Correct the false statement (s). When a reactant is added to a system at equilibrium at a given temperature, the reaction will shift right to reestablish equilibrium.

Molybdenum has a molar mass of 95.94g/mol. How many molecules of molybdenum are in 150.0 g of molybdenum

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration