Which of these elements contains four

valence electrons?

F Helium

G Beryllium

A Carbon

J Oxygen

Arrange the events for the hydrolysis of amide bonds by chymotrypsin in their correct order. 1) attack by ser 195 to give a tetrahedral intermediate 2) enzyme returns to initial state 3) protonation by his 57 and then cleavage of the c-n bond

Calculate the pH of a 1.00 L buffer of 0.97 M CH3COONa / 1.02 M CH3COOH before and after the addition of the following species. (a) pH of starting buffer (b) pH after addition of 0.065 mol NaOH (c) pH after further addition of 0.144 mol HCl

How does chemistry contribute to energy research

Lower ionization energy means that it is easier or harder to remove an electron

Why do surfers put wax on their boards

What is the difference between an organic and inorganic molecule

The variable that you plan to change during the course of an experiment is?

It is often necessary to prepare a dilute solution from a more concentrated solution rather than starting from a solid and just dissolving it then adding water. This technique is called serial dilution.

Zinc metal reacts With hydrochloric

In the equation: 23491Pa → 234 92U + X The X represents a