100 g of radioactive mass has a half life

of 5 days Calculate the mass decayed

off after 15 days

Which reaction is accompanied by an increase in entropy? A) ZnS (s) + 3/2 O2 (g) → ZnO (s) + SO2 (g) B) CH4 (g) + H2O (g) → CO (g) + 3H2 (g) C) BaO (s) + CO2 (g) → BaCO3 (s) D) Na2CO3 (s) + CO2 (g) + H2O (g) → 2 NaHCO3 (s) E) N2 (g) + 3 H2 (g) → 2

How are the properties of elements determined

What is hydrogen bond?

Love is powerful love is

Does absorbance increase or decrease as the solution concentration of the absorbing substance increases?

Which of the following is not a projectile? a. a satellite b. a throw ball c. a ball on the ground d. a soaring arrow

A change of state requires the addition or removal of heat energy. True False

Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars.

How long does a hydrogen bond last in water

If the body temperature of a person is recorded as 37°c, what is the person's body temperature in k? round your answer to the nearest whole number.