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1. When 9.0 g of hydrogen gas, H2, reacts with oxygen gas, O2, 73.0 g of water is produced.    2H2 + O2 --> 2H2O a) What is the theoretical yield of water? b) What is the percentage yield?


2. Powdered zinc metal reacts with sulphur (S8) when heated to produce zinc sulphide.

a) What mass of product can be produced with 25 g of zinc?

b) What is the actual yield if the percentage yield was 80%?


3. The thermite reaction has been used to weld railroad rails, make bombs, and ignite solid rocket fuel. The equation of the reaction is:

a) What is the theoretical yield of iron if 100.0 g of Fe2O3 is used?

b) What is the percentage yield if 52.3 g of iron is actually produced?


Given the reality of duplication and plagiarism, give a parallel description or analogy between proper paraphrasing of textual information and the uniqueness and similarities of isomers.


a patient with Weight 76kg must be injected the solution of NaHCO³ in the concentration of 0.66mol/kg .howany millilitres of this solution with the weight fraction of 4.2ust be taken?

A 1.77×10-1 g sample of HNO3 and a 5.21 g sample of NO react in a closed 8.91 L container at 470 K, according to the following balanced chemical equation:

2HNO3(g) + NO(g) → 3NO2(g) + H2O(l)

Calculate the PNO2 (in atm) in the container after the reaction has gone to completion.


A 7.82 g sample of water is introduced into a 6.46 L flask containing some CO2 gas. The flask is heated to 307.11 °C at which temperature all of the water is converted to the gaseous phase, giving a total pressure in the flask of 12.305 atm. Calculate PH2O (in atm) in the flask at 307.11 °C. Calculate PCO2 (in atm) in the flask at 307.11 °C. Calculate the mass of CO2 (in grams) in the flask at 307.11 °C. Calculate XH2O in the flask at 307.11 °C. 


A 7.82 g sample of water is introduced into a 6.46 L flask containing some CO2 gas. The flask is heated to 307.11 °C at which temperature all of the water is converted to the gaseous phase, giving a total pressure in the flask of 12.305 atm. Calculate PH2O (in atm) in the flask at 307.11 °C. 


B: Lewis structures and molecular shape

1. Determine the Lewis structure of trichloromethane/formaldehyde/methanol.

Trichloromethane

O Formaldehyde

 Z Methanol

2. Predict its molecular shape: you must include a sketch along with bond angles.

3. construct a model of the molecule. Take a snapshot of your model and insert it into

the space provided.

4. Show bond polarities and state whether the molecule is a polar molecule.


B: Lewis structures and molecular shape

1. Determine the Lewis structure of trichloromethane/formaldehyde/methanol. The

compound you select will depend on the first letter of your surname as follow:

 A – F Trichloromethane

 G – O Formaldehyde

 P – Z Methanol

2. Predict its molecular shape: you must include a sketch along with bond angles.

3. Use Styrofoam spheres/play dough/any other available and appropriate material to

construct a model of your molecule. Take a snapshot of your model and insert it into

the space provided.

4. Show bond polarities and state whether the molecule is a polar molecule.


Compare different stereoisomers of the same molecular formula, considering any difference in physical or chemical properties that exist.


The reaction scheme that you propose must allow you to identify your five chosen metal complexes, indicating colours observed and the absence or presence of a precipitate when certain reagents are added. As part of your presentation you must explain the underlying chemistry of your scheme and the reactions involved (ie What is ligand substitution and how does it happen? Why and how do colour changes take place? Why and how does a precipitate form? Why does it sometimes re-dissolve?). Include balanced equations for all reactions.


• how is a reaction scheme done?


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