200 meters north and it took 200 seconds round trip

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

What are the primary responsibilities of a chemical engineer involved in "r& d"? develop large scale manufacturing operations discover new products and processes training of new chemists determine products needed by consumers

Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted