Colloidal Precipitates Properties

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Why do colloidal suspensions not coagulate spontaneously?

Colloidal particles have a high surface-to-mass ratio, which promotes surface adsorption. (correct)

Colloidal particles have a positive charge that repels each other.

Colloidal particles are large and settle quickly.

Colloidal particles are easily filtered.

What is the main function of coagulation in dealing with colloids?

To thicken the liquid and make it solid.

To filter the colloidal particles efficiently.

To repel the particles from each other.

To prevent settling out of colloidal particles from the solution. (correct)

What happens when enough silver nitrate is added to a solution containing chloride ions?

The colloidal particles start to settle rapidly.

The particles start to coagulate spontaneously.

The colloidal particles become negatively charged. (correct)

The solution becomes more stable.

Why are colloidal particles not retained by ordinary filters?

Their small size makes them pass through filter pores. Signup and view all the answers

In gravimetric calculations, what is the aim when dealing with precipitates?

To determine the weight of the analyte from the weight of precipitate. Signup and view all the answers

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

Mole Signup and view all the answers

Which formula gives the simplest whole number ratio of atoms in a chemical compound?

Empirical formula Signup and view all the answers

What is the molar mass of Fe2O3 (Iron (III) oxide)?

159.69 g/mol Signup and view all the answers

How many moles of Hydrogen gas are there in 27g of H2?

13.4 moles H2 Signup and view all the answers

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

18.89% Signup and view all the answers

What is the formula weight of MgCl2?

95.21 amu Signup and view all the answers

What does the empirical formula of a compound indicate?

The relative numbers of atoms of each element in the compound Signup and view all the answers

If a compound contains 60% oxygen and 40% sulfur by mass, what is its empirical formula?

SO3 Signup and view all the answers

In stoichiometric calculations, what do balanced chemical equations provide?

Combining ratios of reactants and products in moles Signup and view all the answers

If a compound contains 72% Mn, what is the remaining element present?

Oxygen Signup and view all the answers

What is the total number of carbon atoms in 5×10^-5 mole of CO2?

$3.01 × 10^{19}$ Signup and view all the answers

What is the unit used to express stoichiometry in balanced chemical equations?

Moles Signup and view all the answers

In stoichiometric calculations, what factor is multiplied by the number of moles to account for stoichiometry?

$6.02 × 10^{23}$ (Avogadro's number) Signup and view all the answers

What is the role of a three-step stoichiometric calculation in a chemical reaction?

Relating the masses of reactants and products Signup and view all the answers

$40$ grams of a compound contain $1.25$ moles of sulfur. What is the molar mass of sulfur?

$32$ g/mol Signup and view all the answers

$0.0022$ gram of CO2 corresponds to how many moles of CO2?

$5 × 10^{-5}$ moles Signup and view all the answers

Colloidal Precipitates Properties

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Questions and Answers

Why do colloidal suspensions not coagulate spontaneously?

What is the main function of coagulation in dealing with colloids?

What happens when enough silver nitrate is added to a solution containing chloride ions?

Why are colloidal particles not retained by ordinary filters?

In gravimetric calculations, what is the aim when dealing with precipitates?

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

Which formula gives the simplest whole number ratio of atoms in a chemical compound?

What is the molar mass of Fe2O3 (Iron (III) oxide)?

How many moles of Hydrogen gas are there in 27g of H2?

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

What is the formula weight of MgCl2?

What does the empirical formula of a compound indicate?

If a compound contains 60% oxygen and 40% sulfur by mass, what is its empirical formula?

In stoichiometric calculations, what do balanced chemical equations provide?

If a compound contains 72% Mn, what is the remaining element present?

What is the total number of carbon atoms in 5×10^-5 mole of CO2?

What is the unit used to express stoichiometry in balanced chemical equations?

In stoichiometric calculations, what factor is multiplied by the number of moles to account for stoichiometry?

What is the role of a three-step stoichiometric calculation in a chemical reaction?

$40$ grams of a compound contain $1.25$ moles of sulfur. What is the molar mass of sulfur?

$0.0022$ gram of CO2 corresponds to how many moles of CO2?

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