An atom of aluminum has an atomic number of 13 and a mass number of 27. How many neutrons does it have?

What is defined as the charge an atom would have in a compound if its bonding electrons were assigned to the more electronegative atom? a) reduction number b) valence c) oxidation number d) electropositivity

A 76.0-gram piece of metal at 96.0 °C is placed in 120.0 g of water in a calorimeter at 24.5 °C. The final temperature in the calorimeter is 31.0 °C. Determine the specific heat of the metal.

4 g of ag2so4 will dissolve in 1l of water. calculate the solubility product (ksp) for silver (i) sulfate.

If I add 25.0 mL of water to 125 mL of a 0.150 M NaOH solution, what will the new molarity of the solution be?

Density Word Problems Use the following formula to answer the problems. You must SHOW your work! density = volume density = mass or, in short form: 1. What is the density of carbon dioxide gas if 0.

What would make the risk of these cancers even worse for someone who drinks alcohol?

For what reasons would modern scientists accept dalton's atomic theory but not the idea of an atom proposed by the greek philosophers?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting

Science is a unique field of thought because it relies on to describe the world. •Observations and experim •Teachers and students •Books and writings •Scientists and statements

Hemoglobin, a protein in red blood cells, carries o2 from the lungs to the body's cells. iron (as ferrous ion, fe2+) makes up 0.33 mass % of hemoglobin. if the molar mass of hemoglobin is 6.8 Ã 104 g/mol, how many fe2 + ions are in one molecule?