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Questions and Answers
Why do colloidal suspensions not coagulate spontaneously?
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?
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?
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?
Why are colloidal particles not retained by ordinary filters?
In gravimetric calculations, what is the aim when dealing with precipitates?
In gravimetric calculations, what is the aim when dealing with precipitates?
What is the SI unit for the amount of a chemical substance?
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?
Which formula gives the simplest whole number ratio of atoms in a chemical compound?
What is the molar mass of Fe2O3 (Iron (III) oxide)?
What is the molar mass of Fe2O3 (Iron (III) oxide)?
How many moles of Hydrogen gas are there in 27g of H2?
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 percent composition of Nitrogen in Mg(NO3)2?
What is the formula weight of MgCl2?
What is the formula weight of MgCl2?
What does the empirical formula of a compound indicate?
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?
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?
In stoichiometric calculations, what do balanced chemical equations provide?
If a compound contains 72% Mn, what is the remaining element present?
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 total number of carbon atoms in 5×10^-5 mole of CO2?
What is the unit used to express stoichiometry in balanced chemical equations?
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?
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?
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?
$40$ 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?
$0.0022$ gram of CO2 corresponds to how many moles of CO2?
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