How many protons are in sodium-23

Which elements form an ionic compound? Check all the boxes that apply. aluminum and oxygen calcium and aluminum fluorine and oxygen lithium and fluorine

Which group of elements shares characteristics with both metals and nonmetals? metalloids salts halogens alloys

Hat is the molar mass for NH3

One hundred million copper atoms are arranged in a line. which is a reasonable estimate for the length of this line?

Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl (aq) HCl (aq), as described by the chemical equation MnO2 (s) + 4HCl (aq) ⟶MnCl2 (aq) + 2H2O (l) + Cl2 (g) MnO2 (s) + 4HCl (aq) ⟶MnCl2 (aq) +

What does LeChatelier's principal mean

How many milliliters of a 0.7% stock solution are required to make 2 l of 0.2% solution? how many ml of solvent will be required to carry out the dilution?

What percentage of the naphthalene molecules emitted a photon?

In an endothermic reaction, heat is absorbed from the surroundings. How does this affect entropy? A. The particles in the surroundings move slower and have decreased entropy. B.

The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that must happen at the molecular level? A. The molecules move more quickly and their average kinetic energy increases. B.