Message are carried from the eye to the brain by

Iodine-131 is a radioactive isotope. after 9.00 days, 46.0% of a sample of 131i remains. what is the half-life of 131i?

How many aluminum atoms are in 3.78 g of aluminum?

1. If a metal with a higher specific heat were used, would this raise or lower the final water temperature? Explain

Which is a correct description of the enthalpy of a reaction? A. The enthalpy of a reaction is the same as each intermediate reaction. B. The enthalpy of a reaction does not depend on the intermediate reactions. C.

In k4[fe (cn) 6], how many 3d electrons does the iron atom have?

How much greater is the energy produced by a fusion reaction compared to a chemical reaction?

True or false. A bond between a metal atom and a nonmetal atom is likely an iconic bond

What is a precipitate? It is a liquid that forms from solution during a chemical reaction. It is a reactant that forms from solution during a chemical reaction. It is a solid that forms from solution during a chemical reaction.

The electron configuration for an atom is 1s22s22p2. How many electrons does the atom have? 4 2 6 5

When a piece of sodium carbonate reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then the solution turns milky and a white precipitate Y is formed a. Write the chemical formula of X, Y and (3) b.