Technetium-99 is used for brain scans. If a Laboratory receives a shipment of 200 g of this isotope, how much will remain after 24 hours? The Half-Life of

Technetium-99 is 6 hours.

Carbon is found in all organic molecules. a. True b. False

If matter is neither created nor destroyed, why can't we just go directly from grams of reactant to grams of product?

Why is an environmental contingency plan important

Carbon has two naturally occurring isotopes: C-12 (natural abundance is 98.93%) and C-13 (natural abundance is 1.07%). How many C-13 atoms are present, on average, in a 30000-atom sample of carbon?

19. Which atom in a water molecule has the greatest electronegativity? a. one of the hydrogen atoms b. both hydrogen atoms c. the oxygen atom d. There is no difference in the electronegativities of the atoms in a water molecule.

If you get pregnant in Dec how long will it take for u to get to second trimester

Name the following compound HClO

Aluminum and Oxygen gas will react to form Aluminum Oxide (Al2O3). When the equation is balanced, How many moles of Al2O3 are formed when a mixture of 0.36 moles Al is ignited? a. 0.12 b. 0.18 c. 0.28 d. 0.46

Which state of the West produces the widest varieties of fruits, vegetables, and nuts? A) California B) Colorado C) Wyoming D) Alaska

A chemical engineer for a fertilizer company is determining the most efficient way to produce ammonia. the engineer carries out the haber reaction under four different conditions.