Which of the following is NOT one of the stages of star evolution?

a. white dwarf

C. blue giant

b. supergiant

d. red giant

What is the ratio of acetate ion to acetic acid (Ka = 1.76*10-5) in a solution containing these compounds at pH 4.38? Write your answer as a decimal and not as a fraction.

Element X and element Y have a difference in electronegativity of 1:2 will the bond XY be covalent or ionic

How is average bond strength related to relative potential energies of the reactants and the products?

What is th leading cause of type 2 diabetes?

The isomerization of cyclopropane follows first order kinetics. The rate constant at 700 K is 6.20 * 10-4 min-1, and the half-life at 760 K is 29.0 min. Calculate the activation energy for this reaction.

Why do cells have a plasma membrane? A. to separate protein from the nucleus B. to distinguish plants from animals C. to define the size of the cell D. to separate the inside of the cell from its enviroment

Base on its molecular mass, what is the molar mass of iron

For the following reaction in aqueous solution, identify all those species that will be spectator ions. Select all that apply. Na, SO4+Hg (NO3) 2HSO4+2NaNO3 Choose one or more: A. Hg2S04 B. Na2S04 C. Nat D. NO3 E. SO42- F. Hg2 (NO3) 2 G. NaNO3 H.

One mole of which hydrocarbon requires 8 mol o2 to achieve complete combustion to give carbon dioxide and water?

How many bromine atoms are present in 39.9 g of CH2Br2