Of the 20 amino acids, how many amino acids are considered essential? why are they called essential?

Hydrogen and nitrogen react to form ammonia. Which statement best describes the reactants and product at equilibrium? A. The concentration of hydrogen and nitrogen equals the ammonia concentration B.

The density of gold is 19.3 the density of iron pyrite is 5.0 if a nugget of iron pyrite and a nugget of gold each have a mass of 50g what can u conclude about the volume of each nugget

How many protons are in an isotope of sodium with a mass number of 25?

How many electrons does fluorine have? How many electron shells? How many electrons are needed to fill the valence shell?

The electronic configuration of an element is 1s^2 2s^2 2p^6. Hkw many valence electrons does it have

How does temperature affect molecules

The color of Benedictâs solution is blue. What color does it change to in high sugar concentration?

What functional groups of the emulsifying agent provide the hydrophilic character? Do these groups affect the pH?

Which element has atoms that can form single, double, and triplecovalent bonds with other atoms of the same element? (1) hydrogen (3) fluorine (2) oxygen (4) carbon

Which of the following statements best describes the basic structure of an atom? Electrons and protons are in motion around a nucleus that contains neutrons Neutrons are in motion around a nucleus that contains protons and electrons Protons are in