What is the average pencil brand and type students use?

Is the element OH really an element?

Which types of orbitals are found in the principal energy level n = 2? s s, f s, d s, p s, p, d

Which of the following is true? A. Lithium is the least reactive element in group 1, because it is the smallest and holds its valence electron more tightly than the others in the same group. B.

Camphor is reduced to isoborneol by sodium borohydride in ethanol. The instructions for safe disposal of the chemical waste generated by this reaction state that the lids should not be screwed back onto the waste containers.

1. Which statement is true? a. Molc ratios limit the number of significant figures in a calculation. b. You must know the masses of all the reactants in a chemical equation in order to determine the masses of all the products. c.

Conductivity in a metal results from the metal atoms having (1) high electronegativity (2) high ionization energy (3) highly mobile protons in the nucleus (4) highly mobile electrons in the valence shell

All atoms are neutral. explain the basis of this fact

What is the ph of a solution containing 0.12mol/l of nh4cl and 0.03 mol/l of naoh (pka is 9.25) ?

A sample of an unknown compound with a mass of 0.847 g has the following composition: 50.51 % fluorine and 49.49 % iron. When this compound is decomposed into its elements, what mass of each element would be recovered?

The thermal effect of the water formation reaction is 286 kj. what will be the thermal effect of its decomposition? why?