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

gamma radiation

alpha radiation

a half-life

beta radiation

If an atom has 17 electrons and its mass number is 35, calculate the following: - number of protons - number of neutrons - atomic number

Ethanol ia a common laboratory solvent and has a density of 0.789 g/mL. What is the mass, in grams, of 123 mL of ethanol?

To make pickles, fresh cucumbers are soaked in a salt water solution called brine. how many liters of a 4% brine solution must be added to 16 liters of a 10% brine solution to dilute it to an 8% solution?

Determine the molar solubility for al (oh) 3 in pure water. ksp for al (oh) 3 = 1.3 x 10-33.

What are the most common elements in a canyon?

What would happen if you tried to sqeeze a gas into a smaller container?

Paint, paint thinners and some cleaning agents can weaken the shell of a hard hat and may eliminate

A 10 chunk of metal has a specific heat of 0.25 J/g ºC. The temperature is changed from 10ºC to 45ºC. How much heat is required?

In this reaction what is the correct coefficient for sodium chloride? pb (no3) 2? nacl → pbcl2? nano3

Classify each of the following as a path function or a state function. work energy distance traveled enthalpy heat