General Chemistry Answers

type of band

• Choose an alkali metal, an alkaline earth metal, a noble gas, and a halogen so that they constitute an isoelectronic series when the metals and halogen are written as their most stable ions.

A mole of a newly discovered crystalline substance weighs 14.56 grams and displaces 2.3 ml of water. What is the density of the crystal? Find the atomic radius and density of each atom if it is a simple cubic cell? BCC? FCC? HCP?

1.     If there are 42 g of Hydrogen in a sample of pure Methane (CH4), how many grams of Carbon are present? Show how these data illustrate the law of definite proportions.

Phosphorus oxychloride, POCl3, is a type of industrial raw material. It is a colourless and transparent liquid, and it has an unpleasant irritating odour. It will smoke intensely in humid air.

(a) Draw all the possible Lewis structures for POCl3. [2 marks]

(b) Determine the most plausible structure from 4 (a). Explain your answer.

[4 marks]

(c) Predict, explain and label the molecular geometry and the bond angles of the structure in 4(b) [4 marks]

(d) Deduce the polarity of the structure in 4(b). [6 marks]

The proton number of elements J and K are 13 and 16 respectively. Suggest the most stable ions for J and K. State the type of stability of these two ions

How many grams of Cu (63.55 g/mol) may be deposited from a Cu2+ solution during electrolysis by a current of 3.00 A for 5 hours? Please report an integer. F = 96485 C/mol

What is the importance of naming compound in the society?

A mole of a newly discovered crystalline substance weighs 14.56 grams and displaces 2.3 ml of water. What is the density of the crystal? Find the atomic radius and density of each atom if it is a simple cubic cell? BCC? FCC? HCP?

Na2CO3(aq) + CaCl2(aq) -------- 2NaCl(aq) + CaCO3 (s)

Calculate the volume (in mL) of 0.100 M Na2CO3 needed to produce 1.00g of CaCO3 (s). There is an excess of CaCl2

Molar mass of calcium carbonate= 100.09 g/mol

volume of sodium chloride =