Third grading

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Problem: (Mass Percentage)

1. Bicarbonate of soda (sodium hydrogen carbonate) is used in many commercial preparations. Its formula is NaHCO3. Find the mass percentages (mass %) of Na, H, C, and O in sodium hydrogen carbonate.

(Weight/Volume Percentage)

2. What is the weight/volume percentage concentration of 250mL of aqueous sodium chloride solution containing 5g NaCl?

a. Calculate the weight/volume (%) 

3. 10.00g BaCl2 is dissolved in 90.00g of water. The density of the solution is 1.09g/mL. Calculate the weight/volume percentage concentration of the solution.

a. Calculate the volume of the solution

b. Calculate w/v (%)

4. 186.4L of aqueous sodium hydroxide solution contains 1.15kg NaOH. What is the weight/volume percentage concentration of this solution in g/100mL?

 a. Convert the units (mass to grams, volume to mL) mass solute (NaOH)

b. calculate w/v (%)

second grading

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Practice Problem:

Predict whether the following ions or molecules can act as either a Lewis acid or a Lewis base.

(a) Ag+

(b) NH3

 

first grading

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  1. What is the fundamental unit in the Système International d'Unités, the SI system (1 point)
    mole
    particles
    substance
    mole concept
Question by: Zhenna

  1. Meaning of "Stoicheion" in stoichiometry (1 point)
    stitches
    element
    molecules
    atoms
Question by: cristel

  1. H2+ N2 →NH2 balance the equation (1 point)
    3H2+ N 2 →2NH2
    H2+ N2 →5NH2
    2H2+ N2 →NH2
    2H2+ N2 →2NH2
Question by: Rosiel

  1. what is not a stoichiometry problem? (1 point)
    Mass-Mass Problems
    volume-percent
    Mass-Mass Problems.
    gas-volume
Question by: Mark Anthony

  1. what is the reactant in a chemical reaction that remains when a reaction stops when the limiting reactant is completely consumed? (1 point)
    left reagent
    Limiting reactant
    Excess Reactant
    extra reactant
Question by: Alleta

  1. What is the reactant that is completely used up during the chemical reaction? (1 point)
    Limiting reactant
    Excess Reactant
    extra reactant
    left reagent
Question by: Kathleen

  1. What is the oxidation and reduction reactions that occurs simultaneously? (1 point)
    reduction
    Redox reaction
    reducing agent
    oxidizing agent

Question by: Reagan
  1. Substance that causes another substance to be reduced (1 point)
    reduction
    Redox reaction
    reducing agent
    oxidizing agent
Question by: Jarlyn

  1. Process by which a substance loses e- (1 point)
    reduction
    oxidation
    reducing agent
    oxidizing agent
Question by: Diane

  1. What is the meaning of GEROA (1 point)
    Gain Energy Reducing Oxidizing Agent
    Gain Electric Reduction Oxygenated Agent
    Gain Energy Reducing Oxygenated Agent
    Gain Electron Reduction Oxidizing Agent

 Question by: Alleta

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Download Quiz answer sheet here:

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play games prepared by the GROUP GENIUSES here:

http://www.quia.com/quiz/3759330.html

 

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