What is the symbol for the second most common element in the universe?

a. H

b. C

c. Fe

d. He?

A large weather balloon requires plenty of helium gas in order to ascend into the atmosphere to take measurements.

How many neutrons are in the nucleus of an atom that has an atomic mass of 36 and atomic number 25

How does the motion of the molecules change during condensation

State the mathematical expression of gas law equation.

Calculate the morality of each of the following solutions: a. 15.4 g KCl in 289.2 mL solution b. 14.4 g of CaCl2 in 0.614 L solution c. 28.0 mL of 3.00 M H2SO4 diluted to 0.250 L

What kind of reaction is ca (s) + h3po4 (aq) ca3 (po4) 2 (s) + h2 (g)

In the teapot dome scandal, what did the secretary of the interior albert fall lease

A Material made of equal parts is called what? A. Atom, B. Pure substance, C. Mixture

Part C Why are dichotomous keys useful in classifying a new species?

2. How is the frequency of a wave determined?