Why do we increase the surface area of a solid when dissolving? a) to decrease the rate of dissolution
b) to decrease the temperature
c) to increase the rate of dissolution
d) to decrease the need for agitation

Answers

Answer 1

Answer: The correct answer is C. Increasing the surface area of a solid when dissolving, increases the rate of dissolution of the solid solute in the solvent. This happens because dissolving involves the collision of the surface

Answer 2

Answer:

Answer:

c) to increase the rate of dissolution

Explanation:

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Prior to the Civil War, the North had 80 percent of the _____ capacity in the United States.A. agriculturalB. politicalC. manufacturingD. military
Which type of bonding involves positive ions immersed in a sea of mobile electrons?
Balance this chemical equation pleaseee
In the reaction C + 02 - CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction? O 18 g O 54 g O 72 g 0 90 g
When 5 grams of salt dissolve in 30 grams of water, what is the resulting mass of the mixture?

A synthesis reaction is a reaction between at least two compounds in which a. one breaks down into at least two products.
b. a compound is decomposed by an electric current.
c. a compound burns in the presence of oxygen.
d. a new compound is formed.

Answers

Answer: d. a new compound is formed.

Explanation:

1. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

Example: $Li_2CO_3\rightarrow Li_2O+CO_2$

2. Electrolytic decomposition is a type of chemical reaction in which one reactant gives two or more than two products. on passing electric current.

Example: $H_2O\rightarrow H_2+(1)/(2)O_2$

3. Combustion is a type of chemical reaction in which fuel is reacted with oxygen to form carbon dioxide and water.

Example:

$C_6H_(12)O_6+O_2 \rightarrow CO_2+H_2O$

4. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.

Example: $Li_2O+CO_2\rightarrow Li_2CO_3$

D; a new compound is formed (like A + B --> AB)

A well-tested explanation that explains a lot of observations isA. a hypothesis.
B. an inference.
C. a theory.
D. a controlled experiment.

Answers

A: Because a hypothesis is a educated guess

A well-tested explanation that explains a lot of observations is a theory.

Copper, silver, and nickel are all classified as

Answers

Answer: currency

Explanation:

Which base is the strongest for the given [H+]? 10-9 10-11 10-10 10-12

Answers

Answer:The strongest base with $H^+]$ concentration is $[H^+]=10^(-12) M$ .

Explanation:

$pH=-\log[H^+]$

Higher the pH value less will be the concentration of $[H^+]$ ion concentration and stronger will be the base.

1. $[H^+]=10^(-9) M$

$pH=-\log[10^(-9)]=9$

2. $[H^+]=10^(-11) M$

$pH=-\log[10^(-11)]=11$

3. $[H^+]=10^(-10) M$

$pH=-\log[10^(-10)]=10$

4. $[H^+]=10^(-12) M$

$pH=-\log[10^(-12)]=12$

The strongest base with $H^+$ concentration is $[H^+]=10^(-12) M$ .

The answer is 10-12. The relationship of pH and [H+] is pH = -lg[H+]. And the higher pH, the stronger base is. So the strongest base has the lowest concentration of H+.

What is the role ofelectrons within an
atom?
A.
Electrons are in the nucleus and have a
negative charge
B. Electrons are in the nucleus and have a
positive charge
C. Electrons are outside the nucleus and
have a negative charge
D. Electrons are outside the nucleus and
have a positive charge

Answers

Option C - Electrons are outside the nucleus and and have a negative charge is the correct alternative.

We have electrons.

We have to determine their role inside the atom.

What are Electrons ?

An electron is one of the subatomic particles within an atom. It is negatively charged particle whose magnitude is 1.6 x 10⁻¹⁹ C.

According to the question -

The role of electrons inside the atom is as follows -

Electrons revolve around the nucleus.
They carry a negative - charge of -1.6 x 10⁻¹⁹ C.

Hence, Option C is the correct alternative.

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The answer would be “C” because electrons are found in the outer layer of an atom, and they are also negatively charged.

Choose the aqueous solution that has the highest boiling point. These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable. 0.100 m C6H12O6 0.100 m AlCl3 0.100 m NaCl 0.100 m MgCl2 They all have the same boiling point.

Answers

Final answer:

The boiling point of an aqueous solution is elevated due to the presence of a nonvolatile solute. The extent of the boiling point elevation depends on the total number of solute particles in the solution. The solution with the highest boiling point would be 0.100 m AlCl3 because it breaks down into the most ions in solution.

Explanation:

The subject of this question is boiling point elevation, a chemical concept that is most relevant to the field of chemistry. The boiling point of an aqueous solution is elevated due to the presence of a nonvolatile solute because the solute lowers the solution's vapor pressure, requiring a higher temperature for the solution to boil. The extent of the boiling point elevation depends on the total number of solute particles in the solution, rather than their individual properties such as mass or chemical identity.

Given the choices of 0.100 m C6H12O6, 0.100 m AlCl3, 0.100 m NaCl, and 0.100 m MgCl2, the solution with the highest boiling point would be 0.100 m AlCl3. This is because AlCl3, aluminum chloride, breaks down into four ions in solution (one Al3+ ion and three Cl- ions), whereas the other substances break down into fewer ions (C6H12O6 doesn't break down into ions at all, NaCl breaks down into two ions, and MgCl2 breaks down into three ions). The more ions a substance breaks down into, the higher the elevation of the solution's boiling point.

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Final answer:

Among the given solutions, the 0.100 m AlCl3 (aluminum chloride) solution should have the highest boiling point as it produces the most particles when it dissociates in the solution, according to the principle of 'boiling point elevation'.

Explanation:

The question asks to choose the aqueous solution with the highest boiling point among 0.100 m C6H12O6 (glucose), 0.100 m AlCl3 (aluminum chloride), 0.100 m NaCl (sodium chloride), and 0.100 m MgCl2 (magnesium chloride). The highest boiling point will be determined by the solution with the most particles, because as the number of particles increase, the boiling point will rise. This concept is part of 'boiling point elevation' in solutions.

Both NaCl and MgCl2 will dissociate into ions when dissolved in water, producing 2 and 3 particles respectively for each formula unit. Meanwhile, AlCl3 will produce 4 particles when it dissociates (Al3+ and three Cl- ions). Glucose is a covalent compound and will not dissociate when dissolved in water; hence it only counts as one particle.

Based on the number of solute particles, AlCl3 should have the highest boiling point as it produces the most particles when it dissociates in the solution.