Radium-226 is a common isotope on earth, but it has a half-life of about 1620 years. given that earth is some 5 billion years old, why is there any radium at all?

A student wants to prepare 250.0 mL of 0.10 M NaCl solution. Which procedure is most appropriate? (formula Molar Mass of NaCl = 58.4 g/mol) A) Add 5.84 g of NaCl to 250. mL of H2O B) Add 1.46 g of NaCl to 250. mL of H2O C) Dissolve 5.

What does the periodic law allow us to do?

In the following reaction, 180 grams of chlorine, Cl2, reacts with 55g of CS2. How much CC14 is produced? CS2 + 3 Cl2 - -> CCl4 + S2C12

Humans breathe in oxygen and release

Which chemical reaction do plants use to take carbon dioxide out of the air

One way to experimentally measure the heat capacity of a Styrofoam cup calorimeter would be to melt a known mass of ice in warm water and measure hte temperature change.

What particle is the only one that determine the type of element you have

Wetlands provide habitats for many living things because of their sheltered waters and

What reaction would the chemical equation 2H2O - - > 2H2+O2 represent? A) Replacement Of Water B) Combustion of water c) decomposition of water d) formation of water

He standard reduction potentials of lithium metal and chlorine gas are as follows: reaction reduction potential (v) li + (aq) + e-→li (s) - 3.04 cl2 (g) + 2e-→2cl - (aq) + 1.