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2 years ago

What are the coefficients needed to balance this chemical reaction to show that matter is conserved? fe + cl2 → fecl3

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1 answer:

motikmotik2 years ago

5 0

Let a, b, and c be the coefficients in the balanced reaction:

a Fe + b Cl₂ → c FeCl₃

Count the atoms that show up among the reactants and products. They should be equal on both sides:

Fe : a = c

Cl : 2b = 3c

Let c = 2. Then a = 2 and 2b = 6, so b = 3.

Then the balanced reaction is

2 Fe + 3 Cl₂ → 2 FeCl₃

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Jennifer has $25. 00 and earns $0. 50 for every chore she completes. Amaya has $13. 00 and earns $2. 00 for every chore she comp

uranmaximum [27]

Taking into account the definition of equation, each girl must complete 8 chores to have the same amount of money.

<h3>Definition of equation</h3>

An equation is the equality existing between two algebraic expressions connected through the equals sign in which one or more unknown values, called unknowns, appear in addition to certain known data.

Each equation has two members, and these are separated by using the equal sign (=).

Each member is made up of terms.

The unknowns, that is, the values to be found, are represented by letters.

The equality between the two algebraic expressions is only verified or true for certain values of the unknown.

<h3>Amount of chores</h3>

To find the amount of chores in this case, in first place you know Jennifer has $25.00 and earns $0.50 for every chore she completes. The money that Jennifer saves is expressed as: 25 + 0.50x, being x the amount of chores that Jennifer sells.

On the other side, Amaya has $13.00 and earns $2.00 for every chore she completes. The money that Amaya saves is expressed as: 13 + 2x, being x the amount of chores that Amaya sells.

They have the same amount of money, then it is expressed by the equation:

25 + 0.50x= 13 + 2x

Taking into account that:

When a value you are adding is passed to another side of the equation, this value will be passed by subtracting.
If a value you are subtracting is passed to the other side of the equation, this value will be passed adding.
When a value you are dividing goes to another side of the equation, it will be multiplied.
If a value is multiplying it passes to the other side of the equation, then it will pass dividing.

The equation is solved as:

25 -13= 2x - 0.50x

12= 1.5x

12÷ 1.5= x

8=x

Finally, each girl must complete 8 chores to have the same amount of money.

Learn more about equations:

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2 years ago

Which phrase best describes a period on the periodic table?

dybincka [34]

The phrase which best describes a period on the periodic table is: a row of elements

Periodic table can be defined as an organized tabular arrangement of all the chemical elements arranged in order of increasing atomic number or number of protons, especially in rows.

On a related note, chemical elements with the same number of valence electrons are found in the same column of the periodic table.

In conclusion, the rows of a periodic table are referred to as periods while the columns are referred to as groups.

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3 years ago

Norma-Jean [14]

Answer:

Showering respect to others. Respect should be extended to everyone Because is one of the best ways to show professionalism

Explanation:

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3 years ago

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Evaluation of a respiratory symptom diary for clinical studies of idiopathic pulmonary fibrosis

lisabon 2012 [21]

Idiopathic pulmonary fibrosis is a chronic, deadly condition that causes a steady loss in lung function.

The phrase pulmonary fibrosis refers to lung tissue scarring and is the cause of worsening dyspnea (shortness of breath). Fibrosis is commonly connected with a dismal prognosis.

<h3>What are the symptoms for Idiopathic pulmonary fibrosis?</h3>

The following are some of the primary symptoms of Idiopathic pulmonary fibrosis:

Breathing difficulty
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1 year ago

What are the moon phases

DIA [1.3K]

It's probably easiest to understand the moon cycle in this order: new moon and full moon, first quarter and third quarter, and the phases in between.

As shown in the above diagram, the new moon occurs when the moon is positioned between the earth and sun. The three objects are in approximate alignment (why "approximate" is explained below). The entire illuminated portion of the moon is on the back side of the moon, the half that we cannot see.

At a full moon, the earth, moon, and sun are in approximate alignment, just as the new moon, but the moon is on the opposite side of the earth, so the entire sunlit part of the moon is facing us. The shadowed portion is entirely hidden from view.

The first quarter and third quarter moons (both often called a "half moon"), happen when the moon is at a 90 degree angle with respect to the earth and sun. So we are seeing exactly half of the moon illuminated and half in shadow.

Once you understand those four key moon phases, the phases between should be fairly easy to visualize, as the illuminated portion gradually transitions between them.

An easy way to remember and understand those "between" lunar phase names is by breaking out and defining 4 words: crescent, gibbous, waxing, and waning. The word crescent refers to the phases where the moon is less than half illuminated. The word gibbous refers to phases where the moon is more than half illuminated. Waxing essentially means "growing" or expanding in illumination, and waning means "shrinking" or decreasing in illumination.

Thus you can simply combine the two words to create the phase name, as follows:

After the new moon, the sunlit portion is increasing, but less than half, so it is waxing crescent. After the first quarter, the sunlit portion is still increasing, but now it is more than half, so it is waxing gibbous. After the full moon (maximum illumination), the light continually decreases. So the waning gibbous phase occurs next. Following the third quarter is the waning crescent, which wanes until the light is completely gone -- a new moon.

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3 years ago

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