The proportion of dissolved substances in seawater is usually expressed in

A. parts per hundred.

B. parts per thousand.

C. parts per ten thousand.

D. parts per million.

How many atoms are there in one mole of carbon? (Show Work)

The requirements of atoms to be able to participate in hydrogen bonding with a hydrogen atom include all of the following except A. atoms must have one lone pair of electrons. B. atoms must be electronegative. C. atoms must be small. D.

Why must sample spots be above the solvent in paper chromatography

Identify the examples of diffusion in the list below. Check all that apply. A teacher takes the cap off a permanent marker. A few minutes later, students at the back of the classroom complain about the odor of the marker.

Spread Spectrum (SS) encoding: a) Name four spread spectrum techniques. b) Which one of them was originally devised against eavesdropping in the military environment?

How many grams of water form when 1.24 l of gas h2 at stp completely reacts with o2?

According to the following reaction, how many grams of hydrogen peroxide ( H 2 O 2 ) are necessary to form 0.182 moles oxygen gas? hydrogen peroxide ( H 2 O 2 ) (aq) → water (l) + oxygen (g)

Using the bohr model describe the changes in electrons energy and electron location when an atom changes from the ground state to an excited state.

Sally is making a model of gold for her chemistry class. She has foam balls for the protons, neutrons, and electrons. She has added 70 protons to her model so far. How many more protons does she need to add to complete her neutral atom of gold?

How many electrons are in an atoms of germanium