Other Chemistry Answers

A calorimeter is filled with 125 g of water. The temp of water is 22.3 C. A 50g chunk of metal at 123 C is dropped into the calorimeter and temp increases to 24.5 C. What is the specific heat of the metal? You can ignore the heat absorbed by the calorimeter.

What is an energy gap? Draw energy diagrams for conductors, semi conductors and insulators.

Why Silicon is the most widely used semi conductive material. Compare Silicon (Si) atom with a
Germanium (Ge) atom ?

Compare a semi-conductor(Si) atom to a conductor(Cu)atom and explain why copper (Cu )is a
conductor and Silicon(Si) is a semiconductor ?

How to draw and properly label the electronic configuration of Si (14),Ca (20) and Al (13). Also, specify the
number of electrons and protons in the cores of these atoms ?

what is the normality of M/2 solution of H3PO4?

If formula of a metallic phosphate is MH2PO4 where M is the metal find: (i) valency of this metal (ii) formula of its chloride and nitrate

If the atomic number of a neutral atom is 11, how many valence electrons does the atom have? How many protons? Also, specify the number of electrons and protons in the core of the atom ?

A 3.530 g sample of an unknown hydrate of cobalt(II) bromide is heated until all the water of hydration is removed. The CoBr2 that remains has a mass of 2.362 g. (Include units in your answer.)

(a) How many moles of CoBr2 are in the sample?


(b) How many grams of water were lost in the dehydration?

(c) How many moles of water were lost?
.

(d) What is the value of "n" in the formula CoBr2 · n H2O? (1, 2, 3, 4...)


Please provide solution.

The chemical formula of a hydrate can be determined by analyzing the percent water in the hydrate, i.e. the ratio of the mass of water lost upon heating divided by the mass of the original hydrate. Use the hydrate manganese(II) chloride tetrahydrate to answer the following questions. (Round your answer to 2 decimal places.)

(a) What is the anhydrous mass of manganese(II) chloride tetrahydrate?
g/mol

(b) What is the mass of the water of manganese(II) chloride tetrahydrate?
g/mol


Please provide the solution.
(c) What is the total mass of manganese(II) chloride tetrahydrate?
g/mol

(d) What is the % water in manganese(II) chloride tetrahydrate?