In terms of the sequence of the scientific method what is the immediate purpose of doing an experiment?

Consider the reaction B (s) + 32O2 (g) →B2O3 (s), ΔH = - 1270kJ What will ΔH be for the reaction if it is reversed? Express your answer with appropriate units.

Balance the following unbalanced redox reaction (assume acidic solution if necessary) : Cr2O72 - + Cl - → Cl2 + Cr3 + Indicate the coefficient that will be used for Cl2 (g) in this reaction

What kind of organic compound is oxybenzone?

Marie and Calvin dissolved 10 grams of KNO3 in 100 grams of water at 25oC. Next they added 5 grams more. Calvin told Marie that they could continue to add solute until they reached 40 grams because the solution was still

The only haploid cells in an organism are

What does a substance in solid fase has

What are the three requirements for an effective collision

What is the force applied when using a simple machine.

Select all that apply. when the products of a reaction have more energy than the reactants: the reaction is exothermic. the reaction is endothermic. the reactants gave up energy. the δh is positive.

How can you determine the number of valence electrons in an atom of a representative element?