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E. solid copper sulfide and silver nitrate react to form copper (ii) nitrate and solid silver sulfide. write a balanced chemical equation that describes the reaction. identify the oxidation number of each element in the reaction. (you do not need to include the total contribution of charge.) is this reaction a redox reaction or a non-redox reaction? explain your answer.

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Answer:

The given reaction is not a redox reaction.

Explanation:

Redox reaction is defined as chemical reaction in oxidation and reduction reactions occurs simultaneously.

Oxidation reaction is defined as the reaction in which an atom looses its electrons. Here, oxidation state of the atom increases.

Reduction reaction is defined as the reaction in which an atom gains electrons. Here, oxidation state of the atom decreases.

Solid copper sulfide when immersed in silver nitrate solution it reacts to form silver sulfide precipitate and copper(II) nitrate solution.

CuS(s)+2AgNO_3(aq)rightarrow Cu(NO_3)_2(aq)+Ag_2S(s)

Oxidation states of elements on reactant side:

Oxidation state of copper  = +2

Oxidation state of sulfur = -2

Oxidation number of silver  +1

Oxidation number of nitrogen = +5

Oxidation number of oxygen = -2

Oxidation states of elements on product side:

Oxidation state of copper  = +2

Oxidation state of sulfur = -2

Oxidation number of silver  +1

Oxidation number of nitrogen = +5

Oxidation number of oxygen = -2

No change in oxidation states of elements is observed which means that the given reaction is not a redox reaction.

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How many grams are there in 2.3 x 10^24 atoms of silver?

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How many grams are there in 2.3 x 10^24 atoms of silver?

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Alicia has a gold bracelet and a silver bracelet. She has a black ring, a blue ring, a brown ring, and a white ring. She also has a gold necklace and a silver necklace. How many different combinations of bracelets, rings, and necklaces can Alicia make?

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Alicia has a gold bracelet and a silver bracelet. She has a black ring, a blue ring, a brown ring, and a white ring. She also has a gold necklace and a silver necklace. How many different combinations of bracelets, rings, and necklaces can Alicia make?

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Central idea: Utopians strive to make gold and silver less valuable. Which statement provides a critique of the central idea? The Utopians use gold to make chains and earrings for enslaved people. To show their disinterest in gold, Utopians drink from earthen cups. It is a waste to use gold for everyday purposes, because it is hard to find. Thomas More wrote during a time when gold was highly valued.

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Correct answer choice is :

C) It is a waste to use gold for everyday purposes, because it is hard to find.

Explanation:

An utopia is an assumed community or society that maintains highly beneficial or nearly perfect conditions for its citizens. The opposition of a utopia is a dystopia. One could also say that a utopia is an ideal place that has been planned so there are no problems. In many cultures, societies, and religions, there is some story or fantasy of a different past when humankind lived in a modest and simplistic state, but at the same time one of perfect happiness and fulfillment.

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Silver tarnishes as silver metal reacts with hydrogen sulfide, H2S, in the air. In this reaction, dark silver sulfide, Au2S, covers the surface of silver. When silver is polished, this coating of silver sulfide can be removed from the surface. This makes the silver shiny again. Enter the coefficients that balance the tarnishing reaction equation. (Type 1 for no coefficient.)Ag(s) + H2S(g) → Ag2S(s) + H2(g)

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Explanation :

In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

(a) The given balanced ionic equation is,

Ni(NO_3)_2(aq)+Na_2S(aq)rightarrow NiS(s)+2NaNO_3(aq)

The ionic equation in separated aqueous solution will be,

Ni^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+S^{2-}(aq)rightarrow NiS(s)+2Na^+(aq)+2NO_3^-(aq)

In this equation, Na^+text{ and }NO_3^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

Ni^{2+}(aq)+S^{2-}(aq)rightarrow NiS(s)

(b) The given balanced ionic equation is,

NaNO_3(aq)+KBr(aq)rightarrow KNO_3(s)+NaBr(aq)

The ionic equation in separated aqueous solution will be,

Na^+(aq)+NO_3^-(aq)+K^+(aq)+Br^-(aq)rightarrow KNO_3(s)+Na^+(aq)+Br^-(aq)

In this equation, Na^+text{ and }Br^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

NO_3^-(aq)+K^+(aq)rightarrow KNO_3(s)

(c) The given balanced ionic equation is,

Li_2SO_4(aq)+BaCl_2(aq)rightarrow BaSO_4(s)+2LiCl(aq)

The ionic equation in separated aqueous solution will be,

2Li^+(aq)+SO_4^{2-}(aq)+Ba^{2+}(aq)+2Cl^-(aq)rightarrow BaSO_4(s)+2Li^+(aq)+2Cl^-(aq)

In this equation, Li^+text{ and }Cl^- are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

SO_4^{2-}(aq)+Ba^{2+}(aq)rightarrow BaSO_4(s)

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Which of the following lines is an example of cliché? Every cloud has a silver lining. The mind is its own place. Seasons of mists and mellow fruitfulness, Do not go gentle into that good night.

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Since a tiny tender child of four,
There’s nothing that I dreamt of more,
Than to jump aboard a great big ship,
A telescope, a map, a sword, by my hip,
To feel the sea breeze in my hair,
To stroke my parrot on the wood chair,
To be bold and brave and happy as can be,
To trek and travel and sail the seven seas.

8 lines. Rhyme scheme aabbccdd. If I managed to write that in about 4 minutes, you could write something much better and longer in like 30 minutes. You can use my rubbish poem as inspiration lol. Good luck X

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Silver tarnishes when it comes into contact with hydrogen sulfide in the air. physical property or chemical property

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The balanced chemical reaction is as shown below,

                 N₂ + 3H₂  –> 2NH₃

The equation shows that every 3 moles of hydrogen, H2, there would be 2 moles of ammonia, NH3, that is going to be formed. Using this concept, we solve for the unknown in this item. 

Since we are restricted only of the number of hydrogen, it becomes our limiting reactant. 

          (6 moles H2) x (2 moles NH3/3 moles H2) = 4 moles NH3

Therefore, given enough amount of N2, the amount of NH3 that can be formed out of the 6 moles of H2 is equal to 4 moles. 

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. A resistor is marked with the following color bands: brown, black, red, and silver. What is the resistance of this resistor? A. 10 B. 100 C. 10,000 D. 1,000

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. A resistor is marked with the following color bands: brown, black, red, and silver. What is the resistance of this resistor? A. 10 B. 100 C. 10,000 D. 1,000

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11. A tournament has 12 hockey teams participating. Find the number of different ways that teams can win gold, silver, and bronze trophies.

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You need to determine the number of ways in which 30 competitors from 50 can qualify. First, you have to realize that the order is irrelevant, that is: it is the same competitor_1, competitor _2, competitor _3 than competitor_3, competitor_2, competitor_1, or any combination of those three competitors.

So, the number of ways is which 30 competitors from 50 can qualify is given by the formula of combinations, which is:

C (m,n) = m! / (n! * (m -n)! )

=> C (50,30) = 50! / (30! (50 – 30)! ) = (50!) / [30! (50 – 30)!] = 50! / [30! 20!] =

 = 47,129,212,243,960 different ways the qualifiying round of 30 competitors can be selected from the 50 competitors.

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The image below shows a postage stamp from 1955: An image of a commemorative postage stamp is shown. The stamp reads first of the land-grant colleges, Michigan State College, Pennsylvania State University, and United States Postage. The years 1855 and 1955 are also included on the stamp. Public Domain Which legislation made possible the commemorative stamp above? Morrill Act Homestead Act Silver Purchase Act Agricultural Education Act

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The Songhai leader who left a
legacy through the reforms in his empire was Muhammad I Askia or Muhammad Ture.
Under his governance, he began organizing his land by setting up regions which
were under the leadership of governors together with their armies under the
ruling of a general and an admiral.  He
also began setting departments and offices for finance, justice, interior, agriculture,
etc. He indeed strengthened the administrative system of what his predecessor
had left unorganized.  After a lot of
quests and changes in his governance, he was able to expand and strengthened
his empire. In 1528, he was defeated and overthrown by his son, Askia Musa. 

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All of the following are chemical changes: baking a cake, rusting a nail, and forming copper nitrate from copper wire and silver nitrate. True False

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1.      A.

It is a technique typically engaged in electrical power and electronic devices, wherein the devices are run at less than their rated maximum power degeneracy, taking into account the case or body temperature, the ambient temperature and the type of cooling mechanism used.

2.      B.

In order to answer the question, you need to know the area of a circle.
Area = pi * r^2
Area = 3.14 * (100/2) ^ 2
Area = 3.14 * 50^2
Area = 7850 mils^2 = 0.00785 in^2

3.      A.

V / 15 A = 0.213 Ohm 
0.213 Ohm / 125 ft * 1000 ft = 1.71 Ohm / 1000 ft 
Closest gauge is #12 AWG (solid wire) 
#12 is 1.588 Ohm / ft, which is a 2.9775 V drop @ 15A

4.      A.

RHW cale insulation can be used up to 167 degrees F.

5.      D.

This is a type of electrical connector used to fasten two or more low-voltage (or extra-low-voltage) electrical conductors.

6.      C. the ease with which a material allows electricity to move is called CONDUCTIVITY

7.      D.

Stranded conductors are not acceptable in the pressure terminals of a duplex receptacle. Aluminum conductors of suitable gauge for a 15 ampere duplex outlet will not fit in the pressure terminal holes. 

8.      D.

A 3/0 AWG THHN insulated Copper is rated at 225 amps and it falls under the 90 degree C table.

9.      D.

A #12 copper conductor with an insulation factor of 90 degrees C is rated at 20 amps. A #12 aluminum conductor with an insulation rating of 90 degrees C is rated at 15 amps. These conductors ratings only applies to three conductors in a rated at 15 amps. These conductors’ ratings only applies to three conductors in a raceway. From 7 to 24 conductors in a raceway, both aluminum and copper conductor’s ratings have to be reduced by .70, so 15 amps x .7 = 10.5 amps and 20 amps x .7 = 14 amps respectively.

10.  A.

NEC 310.15(B)(1) and (2), table 310.15(B)(2)(a), and table 310.15(B)(17).
Convert 158°F to C result is 70°C. 50 amps x .33 correction factor = 16.5 amps

11.  A.

12.  B.

Ideally, nm or armored cable should be installed in a wall stud at least 1 1/4 inches from the front edge of the stud.

13.  C.

Always use flux for electrical connections and never use acid flux on electrical connections

14.  D.

In wire gauge, the lower the number, the larger the diameter. So a 6 gauge is larger than 12 gauge, but smaller than 4 gauge.

15.  A.

16.  D.

17.  C.

Table 310-16 NEC

18. 
MCM means 1000’s (M) of (C)ircular (M)ils

19.  D.

Rubber tape is used to round sharp edges

20.  B.

The larger the diameter, the larger the ampacity, or the ability to carry current.

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1. jackson focused on the needs of the ___________ man.2. in the election of 1828, the u.s. electorate ___________ (increased or decreased?)3. what was the spoils system that was instituted by president jackson?4. what did the 1832 worchester v. georgia case have to say about georgia’a a s control over the cherokee nation?5. more than 25% of cherokee died on a forced march called the _______ ___ _________.6. why did jackson not like the bank of the unites states?7. in an effort to “kill” the bus (bank of the united states) before its charter expired, jackson removed u.s. _____________ from the bank.8. the specie circular (coin act) was an executive order issued by jackson in 1836. it required that all payments for government land had to be in gold and silver. this was done to stabilize the loan practices and the fact that too many bank notes were issued. however, jackson’a a s action triggered an economic recession known as the panic of _____.9. southerners viewed _________ (or taxes on imports) as helping the north at the south’s expense.10. no southern state was more upset about the 1828 tariff than ________ ________. their anger resulted in something known as the nullification crisis.11. what does the term “nullification” mean?12. ___________ debated daniel webster about states’ rights v. nationalism. it is widely believed that webster won these debates. however, this issue would not truly be resolved until the peace that followed the civil war.

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Answer:

Georgia didn’t send representatives to the First Continental Congress, for although Georgians opposed British trade regulations, many hesitated to join the revolutionary movement. They were self-sufficient, and a growing colony. And they thought they needed the protection of British troops against a possible Indian attack.

Explanation:

The First Continental Congress was a delegate convention of 12 of the thirteen North American colonies held on September 10, 1774, in Philadelphia, Pennsylvania, to send a written letter to King George III and Parliament calling for an end to the sanctions imposed by the Metropolis (England).

All colonies formed their association to ban trade with Great Britain.

Georgia did not send representatives, for although Georgians opposed British trade regulations, many hesitated to join the revolutionary movement. They were self-sufficient, and a growing colony. And they thought they needed the protection of British troops against a possible Indian attack.

Georgian delegates met at a provincial congress in Savannah on January 18, 1775, to discuss whether they should join the Association and elect representatives for the Second Continental Congress.

Those who were elected refused to go to Philadelphia. St. John’s Parish, acting alone, sent Lyman Hall.

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Which are the chemical symbols for lead, oxygen, and silver I’m that order?

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Which is the correct mole ratio for aluminum chloride to chlorine in the chemical reaction alcl3 br2 ? albr3 cl2?

Answer : The mole ratio for aluminium chloride to chlorine is, 2 : 3

Explanation :

The given unbalanced chemical reaction is :

AlCl_3+Br_2rightarrow AlBr_3+Cl_2

First we have to balance the chemical reaction.

In order to balance the chemical reaction, the coefficient 2 is put before AlCl_3text{ and }AlBr_3 and the coefficient 3 is put before Cl_2text{ and }Br_2.

The given balanced chemical reaction will be :

2AlCl_3+3Br_2rightarrow 2AlBr_3+3Cl_2

By the stoichiometry we can say that, 2 moles of AlCl_3 react with 3 moles of Br_2 to give 2 moles of AlBr_3 and 3 moles of Cl_2 as a product.

That means,

The mole ratio between the AlCl_3:Br_2:AlBr_3:Cl_2 are 2:3:2:3 respectively.

Thus, the mole ratio for aluminium chloride to chlorine is, 2 : 3

ANSWERED AT 12/10/2019 – 08:02 AM


QUESTION POSTED AT 12/10/2019 – 08:02 AM


Which of the following elements does not form a monatomic ion? argon chlorine sodium oxygen

The element which does  not form  a monatomic  ion is  Argon  

    Explanation

Argon    is  a  group 18 ( noble gas) element.

All noble gas element are inert ( they are non  reactive)

Since argon is inert, it does not form a  monatomic ion since  it has 8  valence electron  in it’s outermost energy  level. ( Argon  outermost energy level is fully occupied with electrons)

ANSWERED AT 12/10/2019 – 07:16 AM


QUESTION POSTED AT 12/10/2019 – 07:16 AM


Complete the chemical change. Na → Na+ a.)2e- b.)proton c.)1e-

Answer:

The answer is c) 1e-

Explanation:

The chemical change is the loss of 1 electron (1 e-) in 1 atom of sodium (Na) to give a sodium cation (Na⁺). You have to put the electron in the cation side of the equation. In this way, the overall process is electrically neutral (1 positive charge is neutralized by 1 negative charge and the other side has not charges):

Na → Na⁺ + 1 e-

ANSWERED AT 12/10/2019 – 07:07 AM


QUESTION POSTED AT 12/10/2019 – 07:07 AM


For the reaction 2H₂(g) + O₂(g) → 2H₂O(g), how many liters of water can be made from 7.5 L of oxygen gas and an excess of hydrogen at STP?

The amount of 1 mole of a gas at STP is calculated to be 22.4L. We first calculate the amount of oxygen gas in moles.
                      oxygen gas in moles = 7.5 L / (22.4 L/mol) = 0.335 moles O2
Then, we calculate the moles of H2O produced based on the given balanced chemical reaction.
                       (0.335 moles O2)(2 moles H2O/ 1 mole O2) = 0.67 moles H2O
Then, converting again the calculated moles to volume,
                volume of water = (0.67 moles) x (22.4 L/mole) = 15 L of H2O
Thus, the amount of gaseous water produced is 15 L. 

ANSWERED AT 12/10/2019 – 06:12 AM


QUESTION POSTED AT 12/10/2019 – 06:12 AM


Which of the following is not equal to 63.7 mm? 6.37 x 104 µm 6.37 x 10-5 km 637 cm 0.637 dm

Conversion factors, 10-2=cm, 10-1=dm, 106=km= 10-6micrometer . Moving the decimal places to the left yields positive exponent, moving to the right yields negative exponent.
63.7mm = 63.7 x10-3 m
               = 6.37 x 10-2 m= 6.37cm
               =0.637 x10-1 m= .637dm
               =6.37×10-5 m (km)= .0000637 km
               =6.37 x104 m= 6.37micrometer
63.77 mm is not equal to 637 cm but 6.37 cm or 6.37 x10-2 m. Hope this helps you.

ANSWERED AT 12/10/2019 – 05:40 AM


QUESTION POSTED AT 12/10/2019 – 05:40 AM

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Which of these would have been MOST likely to be a significant part of the Middle colonies’ economy in 17th century North America? A) sugar B) shipbuilding C) silver mining D) indigo plantations

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John Calvin was born in 1509 in France and died in 1564 in Switzerland. His profession was a theologian. He was famous for leading the Protestant Reformation movement. His set of ideas was later called Calvinism.

He changed his beliefs and in 1533 he converted to Protestantism. After this, he believed the Roman Catholic Church needed changes.

He claimed that the role of god was of great importance since it was predestined by him which person would be elected for salvation and also because of God´s sovereignty. That is to say, God is responsible and has control over everything that happens.

As these ideas concerning Protestantism were not well-seen in all the countries many Protestant Reformers or followers of this religious movement had to move to other countries or cities that permitted this kind of beliefs.

Therefore, lots of people from England travel to the U.S and settled there in order to profess their religion in a free manner and without any restrictions.This is why John Calvin´s ideas take root in the American colonies.

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