If you have a 4.0 g of radioactive substance left after 4 half-lives have passed then how much did you have originally?

25 g

50 g

64 g

10 g

1 - what is 3-what is the 4-How many

How many equivalent resonance forms can be drawn for so2 without expanding octet on the sulfur atom? (sulfur is the central atom.

1. When 50.0 mL of water at 80.0°C was mixed with 50.0 mL of water in a calorimeter at 20.0 C, the final temperature of the 100 mL of water and calorimeter was 47.0 C. Calculate C cal

A 13.0g sample of x combines with a 34.0-g sample of y to form the compound xy2 compound xy2 what is the mass of the recent

What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?

What occurs in a chemical reaction? Products are formed from reactants by the breaking and forming of new bonds. Products are formed without chemical bonds being broken. Reactants are formed without chemical bonds being broken.

What information does the atomic mass of an element provide

The following diagram represents a vertical cross section of sedimentary rock layers that have not been overturned. Which principle best supports the conclusion that these layers have undergone extensive movement since deposition?

What kind of ions do a sodium atom and a chlorine atom become when a valence electron is transferred from one to the other?

NaOH and bleach have several characteristics in common. They include all BUT one of the characteristics listed.