How can a nontoxic, nonflammable refrigerant be dangerous?
a. most common refrigerants decompose on contact with air to form flammable substances.
b. the refrigerant can replace all the air in a space, depriving occupants of oxygen.
c. most common refrigerants decompose on contact with air to form toxic substances.
d. concentrated refrigerant can cause euphoric highs that lead to irrational and dangerous behavior

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Idon't really understand this can you me and show your work.☺☺[ chemistry b] subject [ electron transfer in lonic bonds]grade( 12)

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.