As an electron in an atom falls to a lower energy level the energy of the electron

A. decreases B. increases C. remains the same

What does the half-life of a radioisotope refer to?

Chlorine consists of two isotopes with masses of 35 and 37. If the average atomic mass of a sample of chlorine atoms is 35.5, what is the 35Cl/37Cl ratio?4/13/12/11/1

How much energy would be released if 450.0 g of the substance completely reacted with oxygen?

1. An isotope of cesium-137 has a half-life of 30 years. If 5.0 g of cesium- 137 decays over 60 years, how many grams will remain?

Given CH4+2O2->CO2+2H2O what mass of oxygen would be needed to form 17 grams of carbon dioxide

Which level of organization is best represented by the corn plant? tissue, the highest level of organization organ, the lowest level of organization organism, the level of organization directly above organ system organ system, the level of

What is one product of a condensation reaction between two amino acids, such as glycine and alanine?

A solution is made by dissolving 25.20 g of aluminum acetate in 185.0 mL of water. What is the concentration of acetate ions?

Which best describes how sediment forms? erosion breaks down rock and other material molten rock cools above earths surface loose material is cemented by pressure chemical changes cause sediment to compact together

How will you know whether a solution is saturated or supersaturated?