How old is a fossil that has radioactivity decayed through 4 half-lives of carbon - 14?

Calculate the mass of Na2Co3 required to prepare 250 ml of 0.5 N solution.

What are the general properties of the elements in the first two groups on the right side of the modern periodic table?

A mixture of pure agcl and pure agbr is found to contain 60.94% ag by mass. what are the mass percents of cl and br in the mixture?

What is gravitational energy

Which statement best summarize the relationship between the muscular system and the cardiovascular system? A. The heart is protected from injury by the breastbone. B. Nutrients are carried to the heart through arteries and veins C.

What can the particles of a liquid do that the particles of a solid can't do?

What is the molarity of a solution prepared by dissolving 10.0g of kno3 in 250 ml of solution

What do nucleus act as

Change of state may occur when?

During the combustion of 2.00 g of coal, the temperature of 500 g of water inside the calorimeter increased from 25.0°c to 43.7°c. the specific heat of water is 4.18 j/g·°c. how much heat did the reaction generate?