True or false. elements in the same period have the same number of valence electrons

How many grams of sodium polyacrylate are in one diaper?

What is the molar mass of a compound? A) The mass in grams of 1 mole of the compound B) The number of moles in a molecular formula C) The number of atoms in 1 mole of the compound D) The number of moles in 1 g of the compound

The population of rabbits in a forest is decreasing. Foxes in that region are now competing with each other for the limited number of rabbits in that forest. Which type of competition exists among these foxes?

Hg2I2 (s) ⇄ Hg2 2 + (aq) + 2 I - (aq) Ksp = [Hg2 2+][I-]^2 A saturated solution of Hg2I2 is at equilibrium at 25°C as represented by the equation above. If [I-] = 4.

What has been used to try to predict earthquakes?

Which topic is commonly used to explain activation energy and how chemical reactions happen A. reaction rate B. Collision theory C. Velocity distribution D. Spontaneous reaction

Calculate the density of a rectangular solid that has a mass of 25.71 g, and its dimensions are 2.3 x 4.01 x 1.82 cm.

When the metal sample reacts with acid, the gas evolved will be collected over water; the gas is said to be "wet".

Solid iron (II) sulfide reacts with aqueous hydrochloric acid HCl to produce hydrogen sulfide gas H2S and aqueous iron (II) chloride.

How are mixtures compounds and elements alike?