What does an atomic number represent in an atom?

How many moles and grams of NaOH are needed to dissolve in water to make 4 liters of a 2.0M solution?

Which electrophilic aromatic substitution reaction is reversible? A. Nitration B. Alkylation C. Alkanoylation D. Sulfonation E. Halogenation

Which expression represents the concentration of OH - ions in solution? a. [OH-]  10-14 b. 10-14  [H3O+] c. 10-14  [H3O+] d. 10-14 - [H3O+]

Which of the following is not a characteristic of electromagnetic waves? A.) they can be refracted B.) they can travel through a vacuum. C.) they can travel at various speeds through any one material. D.) they can be reflected.

How many reactants and products are present in a double-replacement reaction?

Halogens have ... Electron affinity

Observe: Change the Surface area from Minimum to Maximum. You can imagine that a solid reactant has been dissolved in a liquid. How does this change how many Reactant B molecules are exposed to Reactant A?

When placed in a 200-mL square box, a substance has a spherical shape and has a volume of 75 mL When placed in a 200-mL circular tube, the same amount of that same substance has a spherical shape and a 75-mL volume.

What is the example to the word camouflage

Given the reaction 2NaOH + H2SO4 = Na2SO4 + 2H2O, what is the total number of grams of NaOH needed to react completely with 196 grams of H2SO4