Which chemical elements were created during the first few minutes of the big bang that started our universe?
A) All 92 of the naturally-occurring chemical elements.
B) Only the elements through iron in the periodic table, i.e., only elements 1 through 26.
C) Only the first three elements: hydrogen, helium, and lithium.
D) Only the heaviest elements, having atomic numbers higher than that of lead.
E) No elements were produced during the big bang--all the normal chemical elements were produced much later.
Question 2
A uniform ball with diameter of 10 cm rolls without slipping on a horizontal tabletop. The moment of inertia of the ball about an axis through its center is 2.2 10-3 kg m2, and the translational speed of its center is 0.45 m/s.
(a) What is its angular speed of the ball about its center of mass? (b) What is the rotational kinetic energy of the ball? (c) What is the ball's angular momentum about its center of mass?
Overview of the cell’s principal chemical building blocks
The chemical structure of mescaline, derived from the peyote cactus.
Chemical structures of ester and amide local anesthetics.
Periodic table of the elements
Atoms and Elements
Problem Solving – Energy Changes in Chemical Reaction