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creativ13 [48]
4 years ago
5

How is a coefficient used to balance an equation

Chemistry
1 answer:
ludmilkaskok [199]4 years ago
3 0

Let's start to understand this question by a simple combustion reaction involving oxidation of Ethane in the presence of Oxygen. When Ethane is burned in the presence of Oxygen it produces Carbon Dioxide and Water respectively. Therefore, the equation is as,

                                C₂H₆  +  O₂    →    CO₂  +  H₂O

Above reaction shows the reaction and the equation is unbalanced. Balancing chemical equation is important because according to law of conservation of mass, mass can neither be created nor destroyed. Hence, we should balance the number of elements on both side.

                                       LHS                      RHS

Carbon Atoms                  2                            1

Hydrogen Atoms              6                           2

Oxygen Atoms                  2                           3

It means this equation is not obeying the law. Now, how to balance? One way is as follow,

                                C₂H₆  +  O₃    →    C₂O₂  +  H₆O

                                       LHS                      RHS

Carbon Atoms                  2                            2

Hydrogen Atoms              6                           6

Oxygen Atoms                  3                           3

We have balanced the equation by changing the subscripts. But, we have messed up the chemical composition of compounds and molecules like Oxygen is converted into Ozone.

Therefore, we will change the coefficients (moles) to balance the equation as,

                                C₂H₆  +  7/2 O₂    →    2 CO₂  +  3 H₂O

                                       LHS                      RHS

Carbon Atoms                  2                            2

Hydrogen Atoms              6                           6

Oxygen Atoms                  7                           7

Now, by changing the coefficients we have balanced the equation without disturbing the chemical composition of compounds and molecules.

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What is the conecntration of Fe3 and the concentration of No3- present in the solution that result when 30.0 ml of 1.75M Fe(No3)
zvonat [6]

Answer:

[Fe^{+3}]=0.700 M

[NO_{3}^{-}]=2.10 M

Explanation:

Here, a solution of Fe(NO₃)₃ is diluted, as the total volume of the solution has increased. The formula for dilution of the compound is mathematically expressed as:

C_{1}. V_{1}= C_{2}.V_{2}

Here, C and V are the concentration and volume respectively. The numbers at the subscript denote the initial and final values. The concentration of Fe(NO₃)₃ is 1.75 M. As ferric nitrate dissociates completely in water, the initial concentration of ferric is also 1.75 M.

Solving for [Fe],

[Fe^{+3}]=\frac{C_{1}.V_{1}}{V_{2} }

[Fe^{+3}]=\frac{(1.75).(30.0)}{45.0+30.0 }

[Fe^{+3}]=0.700 M

For [NO₃⁻],

There are three moles of nitrate is 1 mole of Fe(NO₃)₃. This means that the initial concentration of nitrate ions will be three times the concentration of ferric nitrate i.e., it will be 5.25 M.

[NO_{3}^{-}]=\frac{C_{1}.V_{1}}{V_{2} }

[NO_{3}^{-}]=\frac{(5.25)(30.0)}{30.0+45.0 }

[NO_{3}^{-}]=2.10 M

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Why is it difficult to classify dissolving as simply a physical or a chemical change? (1 point)
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The correct answer is:Some substances keep the same molecular structure when they break down, and others do not.

Some substances change their form when they dissolve and some do not. Dissolution can sometimes be regarded as a sort of reaction between a chemical substance and water.

Usually, we can consider dissolution of a substance in water as a sort of chemical reaction for some substances. For instance, an ionic substance interacts with water to form ions. similarly, some salts become hydrolysed in water and give acidic/basic solutions as  result of that.

However, some substances do not interact with water upon dissolution. They rather remain as molecular entities because they are not composed of ions.

We can see that some substances keep the same molecular structure when they break down, and others do not keep the same molecular structure  when they dissolve hence it is difficult to classify dissolving as a physical or a chemical change.

brainly.com/question/1161517

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SCHOOL ON MARS

Explanation:

his post first published on How We Get To Next.

When we dream about the future of education, we think of neural implants, robot tutors and hovering desks.

We don’t treat it as a question of urgency. Technology, not pedagogy or the needs of civilization, animates discussion. This won’t do in a place like Mars, in an atmosphere where, as Elon Musk puts it, “your eyes and skin would peel away like sheets of burning paper.”

Despite the harsh environment, perhaps Musk will turn out to be right and someday you’ll wake up as one of the thousands—or even millions—of settlers sent to Mars to “safeguard the existence of humanity.” Life will be limited, largely cut off from Earth; new supplies will arrive only once every 26 months. Or maybe you’ll wake up on the surface of the Moon, or in a giant spacecraft, suspended in orbit. It’s claustrophobic. Hostile. You can’t go home.

Now, imagine the children of these new pioneers. The ones who will determine the fate and shape of humanity’s future. What will they need to learn to be able to survive? To graduate? To be employable? What will the teachers and classrooms of space look like? What skills will they focus on?

If we are to survive and flourish in this brave new world, we will have to take these questions seriously. We will need to get the best out of every person, learn how to work in harmony with intelligent machines, and ensure that our common history is preserved.

In space, a failing education system will mean the end of humanity.

Let’s think ahead. Let’s ask how the purpose of education — to build community and unleash human potential — can answer the needs of humans in space. We won’t know exactly what that future will look like, but we can make certain assumptions and then work backward from there. By doing so, we’ll glimpse the answers that will prepare us for space (or an increasingly automated Earth).

A few assumptions, then. These space pioneers (whether imagined by NASA in the 1980s or at a TED Talk in 2015) will face a hostile environment. They will need to manufacture or extract all of the essentials — water, food, oxygen from their local environment. Survival will require a constant attention to technology and manufacturing. Everyone will need to contribute.

Pioneers will be limited in communication options. If the ability to communicate with Earth exists, it will depend on lasers and satellites. Otherwise, there will need to be the creation of new networks and satellites.

This future will be isolated. Living areas will be at a premium. There will be a lack of any stabilizing social forces. There will need to be a new code of government. Cut off from their home nations, pioneers will lack the luxury of feuding over cultural or national differences.

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For Gerald Huff, a principal engineer at Tesla Motors, this will mean a mastery-focused environment, an apprentice-oriented education. “Resources that sustain life will be expensive,” said Huff. “It will be a technical environment. Shop class will be part of the basics of life. Think about Star Trek. On a basic level, everyone knew how the ship worked.”

Course work will need to be practical, not just designed to tick a box. Arts and literature will need to be part of real work. We can see the roots of this in the movement of schools offering rigorous, project-based learning. The problem-solvers ensuring that students, such as the ones at London’s School 21, create “beautiful work” offering real meaning to society.

Look to the Conrad Challenge for a model of this type of future education. Established in honor of Charles “Pete” Conrad, the third man to walk on the Moon, the Conrad Foundation challenges students to create solutions that will benefit humanity. Reaching students from over 136 countries, finalists are paired with mentors and led through design thinking.

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