Which two elements in the periodic table have the same number of electrons in their outer orbitals?

Which statement correctly describes a scientific theory?

For the autoionization of water, ΔH° = 5.58 x 104 J. 2H2O (l) ⇌ H3O + (aq) + OH - (aq) Kw = 1.0 x 10-14 at 25 °C Assuming that ΔH° is constant over the temperature range 25-100°C, calculate KW at 53 °C.

A green rat snake that lives in the grass and a brown rat snake that lives in the desert is a form of what?

Select all that apply. The electron configurations of some elements are given. Based on the electron configurations which elements can likely form ions with multiple charges? A. Zinc [Ar] 3d^10 4s^2 B. Iron [Ar] 3d^6 4s^2 C. Sodium [Ne] 3s^1 D.

A compound with the empirical formula CH20 was found to have a molar mass between 89g and 91g. What is the molecular formula of the compound?

Gasoline catches on fire is it flammability?

Enzymes are proteins that speed up chemical reactions in the body how do they work A. they increase the surface area of reactants B. they increase the concentration of reactants C. they decrease the concentration of products D. They act as reactants

Atomic number for bromine

A reaction with ΔH = - 13 kJ/mol and ΔS = - 22 J/K·mol, at 2°C, the reaction is: A) spontaneous B) nonspontaneous C) at equilibrium D) impossible to determine reactivity E) none of the above

A sample of an unknown liquid has a volume of 30.0 mL and a mass of 6 g. What is its density? i need this hella quick