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Colloidal Precipitates Properties
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Colloidal Precipitates Properties

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Questions and Answers

Why do colloidal suspensions not coagulate spontaneously?

  • Colloidal particles have a low surface-to-mass ratio, which promotes coagulation.
  • Colloidal particles are large and have a small surface-to-mass ratio, which prevents coagulation.
  • Colloidal particles are both positively or negatively charged, and thus repel one another. (correct)
  • Colloidal particles have a high density, preventing them from coagulating.

    • What is the purpose of gravimetric calculations?

  • To determine the weight of solute from the weight of solvent.
  • To determine the weight of analyte from the weight of precipitate. (correct)
  • To determine the weight of solvent from the weight of precipitate.
  • To determine the weight of precipitate from the weight of analyte.

    • What causes the colloidal particles to have a negative charge?

  • Agglomeration of chloride ions (Cl-1).
  • Adsorption of silver ions (Ag+1).
  • Adsorption of excess chloride ions (Cl-1). (correct)
  • Adsorption of silver nitrate (AgNO3).

    • What prevents colloidal particles from settling out of solution under the influence of gravity?

    <p>Brownian motion.</p> Signup and view all the answers

    What is the SI unit for the amount of a chemical substance?

    <p>Mole</p> Signup and view all the answers

    What does an empirical formula give?

    <p>The simplest whole number ratio of atoms in a chemical compound</p> Signup and view all the answers

    What is the mass of the residue ignited at a high temperature to give 0.5394 g of pure Fe2O3?

    <p>1.1324 g</p> Signup and view all the answers

    What does stoichiometry involve?

    <p>Predicting the quantities of reactant materials required to produce a given quantity of products</p> Signup and view all the answers

    Which element is chosen as a standard to establish an atomic weight scale?

    <p>Hydrogen</p> Signup and view all the answers

    What kind of substances are neutral species according to the text?

    <p>Water, SO2, CO2, and I2</p> Signup and view all the answers

    What does the molecular formula specify?

    <p>The number of atoms in a molecule</p> Signup and view all the answers

    What is the percent composition of Mg in Mg(NO3)2?

    <p>$16.39%$ Mg</p> Signup and view all the answers

    How many moles of carbon atoms are there in 0.0022 grams of CO2?

    <p>5*10^-5 mole C</p> Signup and view all the answers

    What is the empirical formula of a compound that contains 60% oxygen and 40% sulfur by mass?

    <p>SO3</p> Signup and view all the answers

    If a compound contains 72% manganese and the remainder is oxygen, what is its empirical formula?

    <p>MnO</p> Signup and view all the answers

    What is the atomic weight of iron (Fe) if 0.5 gram of iron contains a certain number of moles?

    <p>55.85 amu</p> Signup and view all the answers

    In the chemical reaction 2NaI + Pb(NO3)2 -> 2NaNO3 + PbI2, how many moles of aqueous sodium nitrate are produced if 1 mole of Pb(NO3)2 reacts?

    <p>1 mole</p> Signup and view all the answers

    In a chemical reaction, if the known mass of a substance in grams is transformed to a corresponding number of moles, what should be the next step in the stoichiometric calculation?

    <p>Multiplying the number of moles by a factor that accounts for the stoichiometry</p> Signup and view all the answers

    Colloidal particles can be retained by ordinary filters.

    <p>False</p> Signup and view all the answers

    Coagulation occurs when a liquid starts to thicken and become solid.

    <p>True</p> Signup and view all the answers

    Colloidal suspensions are stable and do not coagulate spontaneously because the colloidal particles are positively or negatively charged, and thus attract one another.

    <p>False</p> Signup and view all the answers

    The aim of gravimetric calculations is to find the weight of the precipitate from the weight of analyte.

    <p>False</p> Signup and view all the answers

    The number of moles of carbon in 0.0022 grams of CO2 is 5x10^-5

    <p>True</p> Signup and view all the answers

    The empirical formula merely shows the relative numbers of atoms of each element in the composition.

    <p>True</p> Signup and view all the answers

    Oxygen makes up 60% of the mass in a compound with sulfur, and the empirical formula is SO3.

    <p>False</p> Signup and view all the answers

    Stoichiometric calculations involve converting the known mass of a substance in grams to a corresponding number of moles, followed by adjusting for stoichiometry and then converting the number of moles back to the required metric units.

    <p>True</p> Signup and view all the answers

    In the chemical reaction 2NaI + Pb(NO3)2 -> 2NaNO3 + PbI2, 1 mole of Pb(NO3)2 reacts to produce 1 mole of solid lead iodide.

    <p>False</p> Signup and view all the answers

    If a compound contains 72% manganese and the remainder is oxygen, its empirical formula is MnO2.

    <p>False</p> Signup and view all the answers

    The molar mass of CaO is 56.077 g/mol.

    <p>True</p> Signup and view all the answers

    The molar mass of water is 18.015 g/mol.

    <p>True</p> Signup and view all the answers

    The atomic weight of magnesium is 24.31 amu.

    <p>True</p> Signup and view all the answers

    In the chemical reaction 2NaI + Pb(NO3)2 -> 2NaNO3 + PbI2, if 1 mole of Pb(NO3)2 reacts, 2 moles of aqueous sodium nitrate are produced.

    <p>False</p> Signup and view all the answers

    An empirical formula specifies the number of atoms in a molecule.

    <p>False</p> Signup and view all the answers

    The atomic weight of iron (Fe) is 55.847 amu.

    <p>True</p> Signup and view all the answers

    The mole contains 6.02×10^23 items.

    <p>True</p> Signup and view all the answers

    To establish an atomic weight scale, one element is chosen as a standard and given a numerical value.

    <p>True</p> Signup and view all the answers

    Stoichiometry involves predicting the quantities of product materials required to produce a given quantity of reactants.

    <p>False</p> Signup and view all the answers

    The formula weight of MgCl2 is 95.21 amu.

    <p>False</p> Signup and view all the answers

    Each formula unit of Mg(NO3)2 contains one Mg atom, two N atoms, and six O atoms.

    <p>True</p> Signup and view all the answers

    The percent composition of Mg in Mg(NO3)2 is 16.39%.

    <p>True</p> Signup and view all the answers

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