A radioactive sample is 555 years old. It's half life is 111 years. How many half lives?

How many moles of NaCI are there in 1.14*1024 in particles?

Glycolysis produces NADH. However, NADH cannot cross the inner mitochondrial membrane to be used in the electron transport chain (respiratory chain).

Use the conversion factor 1 amu = 1.66054 * 10-24 g to answer the following questions. a) 1.67 x 10-24 g of neurons is how many (amu)

Striking a rock with a hammer causes the mineral to break into cubes. This is a mineral property test measuring cleavage. A. True B. False

What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n = 5 to n = 1?

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?

Catalysts are substances that increase the rate of reaction but can be recovered unchanged at the end of the reaction. Catalysts can be classified as either homogeneous (same state as reactants) or heterogeneous (different state than reactants).

How many molecules are there in 79g of Fe2O3?