Other Chemistry Answers

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lab observation

An element has 9 protons. What is it’s symbol and what is the mass in grams of the average atom in the element

a piece of chromium metal with a mass of 24.26g is heated in boiling water to 98.3 C and then dropped into a coffee-cup calorimeter containing 82.3g of water at 23.3 C. When thermal equilibrium is reached the final temperature is 25.6 C. Calculate the specific heat capacity of chromium

Which non-aqueous solvents are used to dissolve the following:

(a) grass;

 (b) paint;  

 (c) nail polish; 

(d) oil;

 (e) chewing gum

Given the following equation:            8 Fe + S₈ ---> 8 FeS

What mass of Fe is needed to react with 16.0 grams of sulfur (S₈)?

(Fe= 55.8, S=32)

 A flask is first evacuated so that it contains no gas at all. Then, 2.2 g of CO2 is introduced into the flask. On warming to 22 °C, the gas exerts a pressure of 318 mm Hg. What is the volume of the flask? 

in the leclanche cell why should the complex ion crystallizes into salt