When the amount of a radioactive substance is reduced by 50%, what has occurred?

gamma radiation

alpha radiation

a half-life

beta radiation

Tow formulas for compounds containing hydrogen and oxygen are H2O and H2O2. Do these formulas represent the same compounds? Explain

A student wants to prepare a 1.0-liter solution of a specific Molarity. The student determines that the mass of the solute needs to be 30. grams. What is the proper procedure to follow? (1) Add 30. g of solute to 1.0 L of solvent. (2) Add 30.

Why does argon exist in nature as individual argon atoms and chlorine exist in nature as 2 chlorine atoms covalently bonded together?

Indium has two naturally occurring isotopes and a weighted average atomic mass of 114.82 amu. one of the isotopes has a mass of 112.9043 amu. which is likely to be the second isotope: 111in, 112in, 114in, or 115 in

When trying to identify an unknown element a scientist determine other elements the unknown element reacts with chemicals watch property of the unknown element determines other elements that react with

A sample of pure copper has a mass of 5 grams calculate its volume

Which statement best explains why carbon is present in so many kinds of molecules? Question 1 options: It is abundant on earth, so it is readily available to bond with other elements. It does not form strong bonds, so it breaks apart.

How long does it tae for bleach to evaprate?

What product (s) forms at the cathode in the electrolysis of an aqueous solution of k2so4?

What element is used as a shield to protect people from radioactive substances?