A balanced chemical reaction obeys the law of ...

A) ideal gases.

B) definite proportions.

C) conservation of matter.

D) conservation of energy.

Two isotopes of potassium are K-37 and K-42. How many valence electrons are in an atom of K-42 in the ground state?

Liquid is heated until it boils and becomes water vapor. Which statements is true about the water?

If an element contains 8 electrons how many electrons will be placed in the 2nd valence shell?

Which statement about schrodingers theory of the atomic model is true?

Match the following chemical reactions: synthesis, reversible, exchange, decomposition 1. molecules rearrange and form new molecules 2. simultaneous decomposition and synthesis 3. bonds broken and elements released 4.

All Organisms the energy to function. Which cell organelle provides this energy? A. Nucleus B. Ribosomes C. Chloroplast D. Vesicle

Where can membrane proteins be located? a. entirely within the membrane b. on the surface of the membrane c. in either position d. The position of membrane proteins has never been determined

1. (a) What are the possible interactions between two charged objects?

You are given a substance that is equally soluble in water and hexane, what is the kd

How might you explain the difference between the pH values of the 0.01 M HCl (pH = 1.1) and the 0.01 M HC2H3O2 (pH = 3.6) ?