What scientist described a positively charged core in the middle of the atom

Bob puts 200 grams of ice into a pitcher with 900 grams of water. He gets distracted and comes back later to find that the ice has melted in the water. How many grams of water does Bob now have in the pitcher? h 90 groe ne the love town

A molecular biologist measures the mass of cofactor a in an average yeast cell. the mass is 41.5 pg. what is the total mass in micrograms of cofactor a in a yeast colony containing 105 cells? write your answer as a decimal.

Why do farmers put ammonium nitrate on their farmland?

Which equation represents a physical change? (1) H2O (s) + 6.01 kJ = = >H2O (l) (2) 2H2 (g) + O2 (g) = = >2H2O (g) + 483.6 kJ (3) H2 (g) + I2 (g) + 53.0 kJ = = >2HI (g) (4) N2 (g) + 2O2 (g) + 66.4 kJ = = > 2NO2 (g)

What does the polar nature of water molecules have to do with substances being able to dissolve in water

The summer season at Arica and Rio de Janeiro Occurs from approximately

What are the major function of the digestive system

What is a substance made of identical atoms called?

The hydroxide ion concentration in pure water at 25ºC is NOT equal to A. the hydronium ion concentration. B. 1 X 10^-7 M. C. the hydroxide concentration in a solution with a pH of 7. D. 1 X 10^7 M.

1. Why do rings stay shiny?