Nickel-63 has a half-life of 92 years. how much nickel would remain in a sample that started with 20 grams of nickel-63 at the end of 184 years?

What is the molarity of the solution resulting from the dissolution of 239 g glucose (C6H12O6) in 250 mL water?

Which compound has the smallest mass. H2O CO H2O2 CO2

Calcium has an atomic number of 20 and 2 valence electrons. Oxygen has an atomic number of 8 and 6 valence electrons. Neon has an atomic number of 10 and 8 valence electrons.

Explain why elements and compounds are pure substances

The nucleus of an atom of K-42 contains (1) 19 protons and 23 neutrons (2) 19 protons and 42 neutrons (3) 20 protons and 19 neutrons (4) 23 protons and 19 neutrons

Which is a cause of desertification? A. farming B. creating reservoirs C. overgrazing D. driving motor vehicles

What happens when the threat of exposure to dirty air is reduced in a community? There is enough oxygen available for people's lungs to function normally The amount of indoor air pollutants released during a fossil fuel burn decreases There is a

Is chicken noodle soup an element, a compound, a homogeneous mixture, or a heterogeneous mixture?

How is the amount of sunlight affect the makeup of an ecosystem

How many moles are in 65 g of carbon dioxide (CO2) ?