4. A sample of silicon contains

5.23 x 1011 atoms. Write this amount

as a whole number.

State the name for a group of atoms held together by covalent bonds

How many electrons make up a charge of - 50.0 μc? Express your answer using three significant figures?

The distance between sn atoms in tin metal is 2.82 å. (a) what is the atomic radius of a tin atom in this environment

List the information you need to find how many milliliters of a stock solution of 2.00m mgso4 you would need to prepare 100.0 ml of 1.00m mgso4

Which macromolecules are polymers made of nucleotides

Explain Charles law

2 H2 + O2 → 2 H2O What is the product of this chemical reaction

Which of the following is a chemical property? A.) Ability to burn B.) Mass C.) Density D.) All of the above

What is the density of rock if it has a mass of 25 g?

In a popular classroom demonstration, solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. part a write a balanced chemical equation for this reaction.