If atoms of a halogen nonmetal gain one electron, the atoms then have how many valence electrons?

An object weighing 9.6 g is placed in a graduated cylinder displacing the volume from 10.0 mL to 13.2 mL. what is the volume of this object?

Alculate the density of a substance for which 4.78 x 106 l of the substance has a mass of 1.5 x 107 kg. express your answer using the correct number of significant figures, and do not enter your answer using scientific notation.

What is the hydrogen ion concentration of a solution with pH = 8.75?

24 g of magnesium metal reacts with 16 g of oxygen gas to for magnesium oxide. According to the law of conservation of mass, how much magnesium oxide Weatherbee after the chemical change is complete?

Use this equqation for the problem:4Al+3O2 - -> 2Al2O3 How many moles of oxygen are needed to completely react with 14.8 mol of Al?

Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese (IV) oxide. 4 HCl (aq) + MnO 2 (s) ⟶ MnCl 2 (aq) + 2 H 2 O (l) + Cl 2 (g) 4HCl (aq) + MnO2 (s) ⟶MnCl2 (aq) + 2H2O (l) + Cl2 (g) A sample of 43.

Calculate how many moles of glycine are in a 160.0-g sample of glycine. express your answer using four significant figures.

Which of the following words correctly describes CO2? Select all that apply A. Its a substance b its a compound c its a element D its a mixture

A certain reaction has an activation energy of 51.64 kj/mol. At what temperature Kelvin will the reaction be 5.50 times faster than it did at 343K?

What allows electrons to flow between electrodes in an electrochemical cell? a - conducting wire b - salt bridge c - electrolyte solutions d - battery