How many grams of NH3 are needed to provide the same number of molecules as in 0.15 grams of SF6

The table below gives the numbers of protons, electrons, and neutrons in four atoms. Atom Number of protons Number of electrons Number of neutrons 1 39 39 52 2 40 40 50 3 39 39 54 4 40 40 51 Based on the information that is given, which atom in the

Identify the element that will react with chlorine to form a compound with the general formula XCl4

1) In a chemical reaction, if a color change is detected, if an odor change is detected, or if a precipitate is formed, then: A. a chemical reaction has definitely occurred B. only physical reactions have occurred C.

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.

What period is F (fluorine) in? A) 17 B) 2 C) 7a D) 7b

What is an element that has more valence electrons than fluorine and less energy levels than sodium?

Why can't we breathe in pure oxygen for long

In warm water conditions, female offspring hatch from eggs laid by painted turtles. Male offspring are produced under cold conditions.

It takes 53.0 J to raise the temperature of an 11.0 g piece of unknown metal from 13.0∘C to 24.2 ∘ c. What is the specific heat for the metal?

What happens to the velocity of a sound wave in air if the temperature of the air increases