An isotope of manganese has 25 protons and 30 neutrons. What is the mass number of this isotope?

What are the major organic products are formed when the following compounds react with methylmagnesium bromide (CH3MgBr), followed by the addition of dilute acid? a) propanal b) propanone

Na2SO4 is dissolved in water to make 450 mL of a 0.250 M solution. What is the molar mass of Na2SO4, and how many moles are needed?

Two moles of an unknown substance were shown to have a mass of 240g. What molecular mass does the substance have?

When an atom is chemically stable how many electrons are in its outer energy later?

In each of the following pairs of compounds, which compound is likely to be more soluble in CCl4?

For each solute, identify the better solvent: water or carbon tetrachloride

If an element has 43 electrons, 56 neutrons, and 43 protons, what is its approximate atomic mass?

What did the Cherokee do to assimilate? Check all that apply They invented a writing system. They resisted white settlement. They wrote a constitution. They planted cotton and farmed.

Which of the following correctly compares the radii of Cl and Cl-? Cl has a larger radius than Cl - because Cl has an additional energy shell. Cl has a smaller radius than Cl - because Cl has an expanded electron cloud.

When a stretched string is vibrated up and down with a particular frequency, it causes a standing wave to be produced.