when ammonia is then added, the precipitate dissolves and the solution turns a deep navy blue. what is the net chemical equation that describes this event?
Answers
when ammonia is then added, the precipitate dissolves and the solution turns a deep navy blue. The net chemical equation for the dissolution of the precipitate is
Cu²⁺ (aq) + 4NH₃(aq)→ Cu(NH₃)₄²⁺(aq)
When we have a reaction that involves two solutions we can say that such a reaction is rightly classed to be an aqueous phase reaction. The reactants are all in solution. It is however possible that this reaction that involves species that are in solution would produce a product that is a solid and would separate from the system .The reaction is shown below
Cu²⁺ (aq)+ 2NaOH (aq) → Cu(OH)₂(s) + Na₂SO₄(aq)
This now implies that we can write the net ionic reaction and eliminate the spectator ions from this net reaction;
Cu²⁺ (aq)+ 2OH⁻(aq) → Cu(OH)₂(s)
Now, if we do add the ammonia compound there would be a reaction in which an ammine complex is formed as follows;
Cu²⁺ (aq)+ 4NH₃(aq)→ Cu(NH₃)₄²⁺(aq)
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Related Questions
reversible change must be conceptualized as being so that the system can be considered to always be at equilibrium Select the correct answer below fast slow spontaneous nonspontaneous
Answers
The concept of reversible change requires understanding that the system can quickly reach equilibrium.
A reversible change refers to a process that can proceed in both forward and reverse directions, meaning it can reach equilibrium. In a reversible process, the system can be considered to always be at equilibrium because it can shift between the forward and reverse reactions, maintaining a dynamic balance.
The term "spontaneous" is used to describe processes that occur naturally without the need for external intervention. In the context of reversibility, a reversible change can be considered spontaneous because it can occur spontaneously in both directions, forward and reverse, as long as the conditions allow it.
Therefore, the correct answer is "spontaneous."
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Answer: Slow so that the system can be considered to always be at equilibrium.
Which statement best describes the difference between a substance with a pH of 2.0 versus a substance with a pH of 4.0?
a
(1 point)
O The substance with a pH of 2.0 would have 100 times as many hydrogen ions per volume of water.
o The substance with a pH of 4.0 would have 100 times as many hydrogen ions per volume of water.
O The substance with a pH of 4.0 would have twice as many hydrogen ions per volume of water.
O The substance with a pH of 2.0 would have twice as many hydrogen ions per volume of water.
Answers
Answer:
The answer is the first one.
Explanation:
The lower a pH level the higher the the number hydrogen ions present in the acid's container.
ph = - log(H)
4 = - log(H)
- 4 = log(h)
10^-4 = H+
1 * 10^-4 = H +
ph = - log(H)
ph = 2
- 2 = log(H)
10^-2 = H
1*10^-2 = h
Something the power - 2 is 100 times greater than something with the power of -4
Answer:
the guy above is correct
Explanation:
what phase or phases are present under these conditions. a) t = -70 oc and p = 1.0 atm b) t = -40 oc and p = 15.5 atm c) t = -80 oc and p = 4.7 atm
Answers
Phases present under these conditions are: a) At t = -70 OC and p = 1.0 atm, the phase is solid phase (Ice). b) At t = -40 OC and p = 15.5 atm, the phase is gas phase (steam). c) At t = -80 OC and p = 4.7 atm, the phase present is solid phase (Ice).
Under standard conditions, water exists in its liquid phase at a temperature of 25 °C and a pressure of 1 atm. When the temperature and pressure conditions are modified, the phase of water may change.
The freezing point of water is 0 degrees Celsius, whereas the boiling point is 100 degrees Celsius. Water may exist as a solid (ice), liquid (water), or gas (steam) depending on temperature and pressure.
The state of water, such as gas, liquid, or solid, is determined by temperature and pressure. Water can exist in three states at a given temperature and pressure: liquid, solid, and gas.
The conditions of temperature and pressure at which water shifts from one state to another are known as phase transitions or changes.
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Give an example of an object that has potential energy
Answers
Answer:
A book on a shelf
Explanation:
What is the man’s weight on Mars where the acceleration due to gravity is 3.7 m/s2?
Answers
Answer:
6.39 × 10^23 kg (0.107 M⊕)
Explanation:
This type of confined space is used for many purposes, including the storage of water and chemicals. This is called ______
Answers
This type of confined space is called a tank.
A tank is a large container or vessel that is designed to hold and store various substances, including water and chemicals. Tanks are used in a wide range of industries and applications, such as industrial processes, agriculture, manufacturing, and water treatment.
Tanks can come in various sizes, shapes, and materials depending on the specific purpose and requirements. They can be made of materials like steel, fiberglass, concrete, or polyethylene, and are designed to be structurally sound and resistant to corrosion or leaks.
The storage of water in tanks is common for purposes such as drinking water supply, irrigation, firefighting reserves, or water storage for industrial processes. Chemical storage tanks, on the other hand, are used to store and handle different types of chemicals, including hazardous substances. These tanks are often designed with specific safety features to ensure the containment and proper handling of the stored chemicals.
Confined spaces like tanks require careful management and adherence to safety protocols due to potential risks associated with their use. These risks may include the presence of toxic gases, lack of oxygen, potential for explosions or fires, and the possibility of engulfment or entrapment. Proper ventilation, monitoring, and safety equipment are essential to ensure the safe operation and maintenance of tanks.
It's important to note that when working with tanks or any confined spaces, it is necessary to follow safety guidelines and regulations to protect the health and well-being of individuals and to prevent environmental hazards.
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Radioisotopes have been used to determine the age of all of the following EXCEPT:
a)brandy
b) cloth
c) living plants
d) wood
Answers
The answer is a) brandy. Radioisotopes have been used to determine the age of various materials through radiometric dating techniques.
These techniques rely on measuring the decay of radioactive isotopes present in the material to estimate its age. For example, carbon-14 dating is commonly used to determine the age of organic materials such as cloth, living plants, and wood. By contrast, brandy, being a distilled alcoholic beverage, does not contain organic material that can be used for radiometric dating. Instead, other methods, such as historical documentation or chemical analysis, are typically employed to determine the age of brandy.
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Which processes involve nuclear changes?
A. fission and fusion
B. erosion and weathering
C. combustion and oxidation
D. evaporation and condensation
Answers
Answer:
Nuclear processes, including fusion, fission, and radioactive decays of unstable nuclei, involve changes in nuclear binding energies.
Explanation:
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How many grams are in 3 mol of KBr?
A. 238 g
B. 476 g
C. 119 g
D. 357 g
Answers
Answer:
Its 357 y'all
Explanation:
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Answer:
357
Explanation:
Producers are generally found at the beginning of a food chain. Which
statement best explains why this is true? *
1. Producers are usually smaller in size than consumers.
2. Producers do not rely on other organisms for food.
3. There are always more consumers than producers in food chains.
Answers
Explanation:
Second answer is the correct one.
Based on the electron configuration of the two atoms predict the ratio of metal cationic atom to nonmetal anionic atom in the compound magnesium bromine
Answers
The electron configuration of magnesium is [Ne] 3s2, and the electron configuration of bromine is [Ar] 3d10 4s2 4p5.
Magnesium will lose two electrons to become a cation with a 2+ charge, and bromine will gain one electron to become an anion with a 1- charge. Therefore, the ratio of metal cationic atom (Mg2+) to nonmetal anionic atom (Br-) in the compound magnesium bromine will be 1:2. With a word count of 100, this answer provides a clear explanation of the electron configuration and the resulting ratio of metal cationic atom to nonmetal anionic atom in magnesium bromine.
Based on the electron configuration, the ratio of metal cationic atom (magnesium) to nonmetal anionic atom (bromine) in the compound magnesium bromide is 1:2. Magnesium has an electron configuration of [Ne] 3s², meaning it has two valence electrons and forms a +2 cation. Bromine has an electron configuration of [Ar] 4s² 3d¹⁰ 4p⁵, with seven valence electrons, forming a -1 anion. To achieve a neutral compound, one magnesium ion (+2 charge) will bond with two bromine ions (-1 charge each), resulting in the formula MgBr₂.
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Four solutes are added to a solvent. All solutes have the same mass and solubility. The surface areas of four solutes are 2 mm2, 4 mm2, 6 mm2, and 10 mm2. Which solute will dissolve the quickest? 2 mm24 mm26 mm210 mm2.
Answers
Of the four solutes added to a solvent, the one with the smallest surface area (2 mm2) will dissolve the fastest.
ReasoningSuperficial areaThe surface area or particle size especially affects the rate of solubility.
The greater the surface area (smaller particle size) the faster it dissolves. This is evidenced by the fact that a sugar cube dissolves more slowly than granulated sugar.
Solubility rateThe rate at which a solute dissolves depends on the size of the solute particles.
Dissolution is a surface phenomenon, since it depends on solvent molecules colliding with the external surface of the solute.
A given amount of solute dissolves faster when it is ground into small particles, rather than large chunks, because more surface area is exposed.
Other Factors Affecting SolubilityIn addition to solute surface area, temperature and pressure influence the balance of intermolecular forces between solvent and solute, and the change in entropy that accompanies solvation, thus changing solubility.
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Write a balanced half-reaction for the oxidation of solid manganese dioxide to permanganate ion in acidic aqueous solution. be sure to add physical state symbols where appropriate.
Answers
The balanced oxidation half equation is given below:
MnO₂ + H₂O → MnO₄⁻ + H⁺ + 3 e⁻What are oxidation reactions?Oxidation reactions are reactions in which the oxidation of the species increases.
Oxidation reactions can involve addition of oxygen or electronegative elements to a substance or the removal of hydrogen or electropositive elements from a substance.
The balanced half-reaction for the oxidation of solid manganese dioxide to permanganate ion in acidic aqueous solution is given below:
MnO₂ + H₂O → MnO₄⁻ + H⁺ + 3 e⁻
In conclusion, the balanced oxidation half equation shows that three electrons were lost by the manganese (iv) ion to form manganese (vii) ion.
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alloying is agreat importance because it is of the primary ways of modifing the properties of pure metallic elements what are these properties
Answers
Answer:
Good electrical conductors and heat conductors.
Malleable - can be beaten into thin sheets.
Ductile - can be stretched into wire.
Possess - metallic luster.
Opaque - as thin sheet.
Solid - at room temperature.
Explanation:
If 16% of the nucleotides in one strand of a dna molecule contain the base g, what percent of the nucleotides on the complementary strand will also contain the base g?
Answers
If 16% of the nucleotides in one strand of a DNA molecule contain the base g, what percent of the nucleotides on the complementary strand will also contain the base g but it is impossible to determine from the information given.
DNA double helix. The hydrogen bonds are damaged and the helix is opened. Each strand of DNA acts as a template for synthesizing a brand new complementary strand. During replication, equal DNA double helices are formed, every with a brand new strand and a vintage strand.
Also, cytosine (C) enhances guanine (G) and adenine (A) enhances thymine (T). Therefore, the complementary strand for 5'-TAGAC 3' is 3'-ATTCG 5', similar to alternative c.
His Chargaff's discovery of A = T and C = G, combined with a few very essential X-ray crystallographic research through British researchers Rosalind Franklin and Maurice Wilkins, Watson Contributed to Crick's derivation of his 3-D double helix model. DNA structure.
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2. What is the molar mass of PCls?
Answers
Alcohols are flammable, suggest how the mixture of alcohols should be safely heated so that ethanol can be collected
Answers
Why does one boil the charcoal-unknown-water mixture as opposed.
Answers
In a charcoal-water-unknown mixture, this must be boiled in opposition because the coal is insoluble, and with the heated mixture the coal can be removed.
What is the recrystallization process?It is used in the chemical sciences as a technique used to purify chemicals by heating materials to temperatures above the crystallization of each compound.
Therefore, when a component is heated, the impurities are dissolved and can be removed from the solution, generating the purification of the compound.
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16) What is the aluminum ion concentration in a solution that is 0.646 M in aluminum sulfate
Answers
Aluminum ion has a charge of 3+, Al³⁺, and sulfate is SO₄²⁻, so the compound aluminum sulfate has to have a number of aluminum and sulfate such that the final charge is zero, so the proportion on aluminum sulfate is:
\(Al_2(SO_4)_3\)That way we have 6+ and 6-, so neutral compound.
This means that for 1 mol of aluminum sulfate, we have 2 moles of aluminum ion. The molar concentration is the number of moles of solute divided by the volume of solution, so it is directly proportional to the number of moles.
So, we can use a rule of three as follows:
aluminum ion --- aluminum sulfate
2 --- 1
x --- 0.646 M
So:
\(\begin{gathered} \frac{2}{x}=\frac{1}{0.646M} \\ 2\cdot0.646M=x\cdot1 \\ 1.292M=x \\ x=1.292M \end{gathered}\)So, the concentration of aluminum ion in this solution is 1.292 M.
What is the expected calcium carbonate content in modern surface sediments at a latitude of 0 degrees and a longitude 60 degrees east?
Answers
The expected calcium carbonate content in modern surface sediments at a latitude of 0 degrees and a longitude of 60 degrees east is variable and influenced by several factors such as water depth, temperature, and productivity.
The calcium carbonate content in modern surface sediments can vary significantly based on environmental conditions. Factors such as water depth, temperature, and productivity play crucial roles in the deposition of calcium carbonate. In general, areas with higher water temperatures and greater productivity tend to have higher calcium carbonate content. However, at a latitude of 0 degrees and a longitude of 60 degrees east, it is challenging to provide a specific expected calcium carbonate value without more detailed information about the local environment and sedimentary processes. It is necessary to consider factors like oceanographic currents, upwelling patterns, and the presence of carbonate-producing organisms to estimate the calcium carbonate content accurately. Field studies and sediment sampling in the specific location of interest would be needed to determine the expected calcium carbonate content more precisely.
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water molecules are polar with ends that exhibit partial positive and negative charges. such opposite charges make water molecules attract each other through bonds called
Answers
Polar water molecules have partial positive and negative charges on their both the ends. Because of their diametrically opposed charges, water molecules are drawn to one another by ionic bonds.
The main interaction taking place in ionic compounds is ionic bonding, a form of chemical bonding that includes the electrostatic attraction between two atoms or ions with dramatically differing electronegativities.
An atom may establish bonds with other atoms in two main ways. They are covalent and ionic. The sharing of electrons between two or more atoms, they in turn properly form a covalent connection. When two or more ions join in contact, they can create ionic bonds that are kept together by charge differences.
A water molecule contains two poles. It is a positive charge on the hydrogen pole along with a negative charge on the oxygen pole. This is due to the uneven sharing of electrons between the atoms and the asymmetrical form of the molecule.
Thus, water molecules are drawn to one another by ionic bonds.
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Calculate the number of molecules in 7 moles of oxygen
Answers
Answer:
4.21
Explanation:
use Avogadro's number
6.023 x 10^23
multiply this by 7 because you want to find 7 moles :
6.023 x 10^23 x 7 = 4.21
2. When two oppositely charged particles are brought near each other, they produce a torceted the stone
shows the force around two changed particles
Which force do the arrows represent?
A an unbalanced force
B. a frictional force
C.an electrical force
D.a gravitational force
Answers
Answer:
A
Explanation:
An unbalanced force is your answer.
Which of these has the lowest first-ionization energy?
A) Cs
B) Ag
C) Pb
D) Br
E) Se
Answers
Answer:
Francium is the answer
Nate and Clara are drawing pictures with markers. There are 8 markers in a set. Nate has 9 markers and Clara has 7. What can Nate and Clara do so that each of them has a full set?
Answers
9-1=8
7+1=8
the _________ in the equation means a reaction is happening
Answers
predict whether the following equilibrium reactions lie predominately to the left HPO4+ H2O ---> H2PO4- + OH-NH4+ + OH- ---> NH3+ H2O
Answers
HPO₄+ H₂O ---> H₂PO₄- + OH- reaction lies predominantly to the right, while NH₄+ + OH- ---> NH₃+ H₂O reaction lies predominantly to the left. This means that in the first reaction, the products will be favored, while in the second reaction, the reactants will be favored.
For the first equilibrium reaction:
HPO₄- + H₂O ⇌ H₂PO₄- + OH-
HPO₄- is a weak acid, and H₂O is a weak base. H₂PO₄- is a conjugate acid of a weak base, and OH- is a strong base. Therefore, this reaction represents the dissociation of a weak acid and the formation of a weaker acid and a strong base.
Since the product side contains a strong base (OH-), this means the reaction lies predominantly to the left, and the reactant HPO₄- is favored.
For the second equilibrium reaction:
NH₄+ + OH- ⇌ NH₃ + H₂O
NH₄+ is a weak acid, and OH- is a strong base. NH₃ is a weak base, and H₂O is a weak acid. Therefore, this reaction represents the dissociation of a weak acid and the formation of a weaker acid and a weak base.
We can compare the relative strengths of the acids and bases involved. The conjugate base of NH₄+ (NH₃) is a weaker base than the conjugate base of H₂O (OH-), which means that NH₄+ is a stronger acid than H₂O.
Therefore, the equilibrium lies predominantly to the right, and the product NH₃ is favored.
The first equilibrium reaction lies predominantly to the left, and the reactant HPO₄- is favored. The second equilibrium reaction lies predominantly to the right, and the product NH₃ is favored.
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the element that automatically assigns ip addresses to lan hosts is:
Answers
The element that automatically assigns IP addresses to LAN hosts is a DHCP (Dynamic Host Configuration Protocol) server.
A DHCP server is responsible for managing and assigning IP addresses within a Local Area Network (LAN) dynamically. When a device connects to a LAN, it requests an IP address from the DHCP server, which then assigns an available IP address from a predetermined pool. This process eliminates the need for manual IP address configuration on each individual device.
The DHCP server also provides additional network configuration information to the hosts, such as subnet masks, default gateways, and DNS (Domain Name System) server addresses. By automatically assigning IP addresses, the DHCP server simplifies network administration and ensures efficient utilization of IP address resources.
The DHCP protocol allows for flexibility and scalability, as new devices can join the network without manual intervention. It also supports lease management, where IP addresses are leased to hosts for a specific period, after which they can be reclaimed and reassigned to other devices.
In summary, a DHCP server is the element responsible for automatically assigning IP addresses to LAN hosts, streamlining the process of network configuration and management.
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You mass two substances. One substance has a mass of 22.45 g and the other has a mass of 3.1 g. What is the total mass of both objects?
Answers
Answer:
25.55 g
Explanation:
To find the total mass of both objects, you need to add the masses together.
22.45 g + 3.1 g = 25.55 g
In correct significant figures (2 sig figs to match 3.1 g), the value would be 26 g.
Answer:
answer = 25.55
Explanation:
You just have to add the mass of the two objects
As a result of an oxidation-reduction reaction, how is the oxidizing agent changed?.
Answers
As a result of an oxidation - reduction reaction . The oxidizing agent changes as it gains electrons and gains potential energy.
Oxidation is defined as the loss of electrons. The reactant which undergo oxidation is act ad reducing agent, Reduction is the gain of electron. The reactant which undergo reduction will act as the oxidizing agent. so, oxidizing agents gains the electron. The reactant which accepts the electron is called as the oxidizing agent because it oxidize the another reactant.
Thus, As a result of an oxidation - reduction reaction . The oxidizing agent changes as it gains electrons and gains potential energy.
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