The half-life of a certain element is 100 days. How many half-lives will it be before only one-fourth of this element remains? 4

50

25

2

Can you determine the atomic weights of zinc or copper by the methods used in this experiment? how? what additional information is necessary in order to do this?

Magnetic striping is evidence of

Choose the molecule or compound that exhibits dipole-dipole forces as its strongest intermolecular force. a) BCl3 b) N2 c) H2 d) SO2 e) CBr4.

State lechalelier principle

Consider the reaction CH4 (g) + 2O2 (g) - > CO2 (g) + 2H2O (g) how many grams of methane should be burned in an excess of oxygen at STP to obtain 5.6 L of carbon dioxide? 2.0 g 4.0 g 16.0 g 32.0 g

How many grams of KCl are produced when 60 grams of K are reacted?

Whats a solution! people

How do compounds affect an atom's stability

You need to make 10 mL of 2 mg/ml solution of protein and you have 25 mg/mL solution. How much protein solution and water do you need to mix in order to make the required solution?

The definition of volume is? a) width*height b) the space occupied by mass c) the space occupied by a liquid d) the mass of liquid required to fill a container