If a potassium atom has an atomic number of 19 and a mass number of 39, how many protons, electrons, and neutrons are in the atom?

What problems can arise if plants and animals are transferred from their natural communities? Select all that apply. overpopulation disease wiping out habitats extinction by not mating unbalanced trophic levels

Four gases were combined in a gas cylinder with these partial pressures: 3.5 atm N2, 2.8 atm O2, 0.25 atm Ar, and 0.15 atm He. What is the total pressure inside the cylinder? atm

If 15 g of CzHo reacts with 60.0 g of Oz, how many moles of water (H2O) will be produced? (Hint: use what you know about limiting reactant) * 2 C2H6 + 7 O2 + 4 CO2 + 6 H2O O 1.5 mol H20 O 1.6 mol H20 O 1.0 mol H20 O 1.1 mol H20

Why is it useful to model systems that use energy?

What a aquatic biome and what do it so

If you bend a straight chain of carbons, do you make a different structure? Why or why not?

The out side t layer is the linnets layer in the earth

What job can you do without going to college?

Which planet has no atmosphere which prevents erosion?

Why must you wear safety glasses at all times