What is the half-life of a 3 g sample of radioisotope that decayed to 0.75 g in 30 days?

Multiple Choice Which of the following numbers are equivalent to 20%? Choose all that apply. A. 0.002 B. The fraction is 1 over 4. C. 0.20 D. one-fifth

The chemical reaction shown above takes place in a closed system. What is true about the system while the reaction occurs? A. The total number of particles in the system increases. B. The total number of particles in the system decreases. C.

How many moles of Fe2O3 are formed when 55.8 g of Fe reacts completely with oxygen

If a pharmacist added 12 g of azelaic acid diluent should be used to prepare 8 fluidto 50 g of an ointment containing 15% ounces of the mixture? azelaic acid, what would be the final con - 8. 3 tetracaine centration of azelaic acid in the ointment?

Take 3 drops per 15 lbs. of body weight per day divided into 6 doses until the cooties are gone. how many drops do you take per dose if your body weight is 155 pounds?

Type of ion formed by group 2A elements

When comparing the two elements P and I, the element with the higher first ionization energy is PP When comparing the two elements P and I, the element with the higher first ionization energy is blank based on periodic trends alone.

Internal respiration is the transfer of oxygen and carbon dioxide from the lungs to the tissue cells of the body. True or False

Which element is a metalloid? 1. Al 2. Ar 3. As 4. Aa

You move a 25N object 4 meters. Find the work you did