PLEASE HELP!

e. Does beryllium (Be) or sodium (Na) have the same inside electron arrangement as magnesium (Mg)? Why?

Answer: 177.23 g.

Explanation:

the volume of the aluminum bar is

1.7 cm x 3.0 cm x 12.9 cm

= 65.61 cm^3

2.7 g/cm^3 x 65.61 cm^3

177.23g

Step 1

The chemical formula of iron (III) sulfate is the next one:

Fe2(SO4)3

As we can see, there are 3 x 1 atom of S, 3 atoms of S

----------------

Step 2

Information needed:

The atomic masses of:

Fe) 55.8 g/mol

S) 32.0 g/mol

O) 16.0 g/mol

(Please, the periodic table is useful here)

----------------

Step 3

The % of S in Fe2(SO4)3 is calculated as follows:

Answer: 24 % of S

To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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Succinic acid most probably

Lets see why?

The molar mass is given as 118.084g/mol

Decimal next place i.e 10th place contains 0 means it has OH bonds in most of the cases.

So it's a hydrocarbon and more closely an alcohol or aldehyde

Let's verify

Approximately equal

The ball moves to and fro. It rises to extreme positions on both sides and reverses its motion

Oscillations gradually die down

A spring can be elongated by a force applied at one end in the direction of its long axis, the other end is being fixed

The increase in the length is directly proportional to the magnitude of force

Heating air causes the air molecules to travel farther apart, thereby making the air less dense. Less dense air will always rise above dense air. As the warm, lighter, air rises upwards the paper spiral begins to spin.

Answer:

The answer is Option a, that is "−9kJmole,5kJmole".

Explanation:

Please find the complete question in the attached file.

In the question, it uses the catalyst inside a process, which does not modify the process eigenvalues, however, it decreases the active energy with an enthalpy of -9kJmole, and also the power for activating decreases around 13 to 5 kJ mole, that's why the choice a is correct.

Iron (III) Phosphate is the limiting reagent for this reaction.

Main concepts:

Concept 1: Molar Mass

Concept 2: Mole ratio

Concept 3: Limiting reagent

Concept 1: Molar Mass

To find how these substances react, we'll need to know the Molar Mass of each of the two compounds we're working with.  To find the Molar Mass, add their Atomic Weights from the periodic table:

\(M_{CaCO_3} = M_{Ca} + M_{C} + 3*M_{O}\)

\(M_{CaCO_3} = (40.08) + (12.01) + 3*(16.00)\)

\(M_{CaCO_3} = 100.09 \frac{g}{mol}\)

Or, in other words, \(1~\text{mol}~CaCO_{3} = 100.09~\text{g}~CaCO_{3}\)

\(M_{FePO_{4}} = M_{Fe} + M_{P} + 4*M_{O}\)

\(M_{FePO_{4}} = (55.85) + (30.97) + 4*(16.00)\)

\(M_{FePO_{4}} = 150.82 \frac{g}{mol}\)

Or, in other words, \(1~\text{mol}~FePO_{4} = 150.82~\text{g}~FePO_{4}\)

Concept 2: Mole ratio

Mole ratios are determined from the Balanced Chemical Equation:

\(3~CaCO_3 + 2~FePO_{4} \rightarrow Ca_{3}(PO_4)_{2} + Fe_{2}(CO_{3})_{3}\)

This Equation tells us that 3 moles of  \(CaCO_3\)  react with 2 moles of \(FePO_{4}\)  to produce 1 mole each of \(Ca_{3}(PO_4)_{2}\)  and  \(Fe_{2}(CO_{3})_{3}\).

Looking at just the two compounds we're interested in from the question, each time the reaction occurs, we're combining 3 moles of  \(CaCO_3\)  with 2 moles of \(FePO_{4}\).  So, when the reaction occurs, \(3~\text{mol}~CaCO_3 = 2~\text{mol}~FePO_{4}\).

From that equation, two mole ratios can be formed (each is just a reciprocal of the other):

\(\dfrac{3~\text{mol}~CaCO_3} {2~\text{mol}~FePO_{4}}\)  and  \(\dfrac{2~\text{mol}~FePO_{4}} {3~\text{mol}~CaCO_3}\)

Which mole ratio we'll need depends on which units we need to cancel out.

Concept 3: Limiting reagent

We were given that there are 100 g of Calcium Carbonate  \(CaCO_3\).   If it were to completely react, then it would follow the mole ratio for the balanced equation.

First, use the Molar mass to convert from grams to moles, then the mole ratio to convert between moles of one substance to moles of the other.  Finally, use the other substance's Molar mass to convert into grams to find out how many grams of the second substance would be needed to completely react with the first.

\(\dfrac{100~\text{g}~CaCO_3}{} * \dfrac {1~\text{mol}~CaCO_3}{100.09~\text{g}~CaCO_3}} *\dfrac{2~\text{mol}~FePO_{4}} {3~\text{mol}~CaCO_3} *\dfrac{150.82~\text{g}~FePO_{4}} {1~\text{mol}~FePO_{4}} =\)

\(=100.456~\text{g}~FePO_{4}\) would be needed to completely react the 100 grams of Calcium Carbonate.

Recall that we only have 45 grams of Iron (III) Phosphate, which is not the 100.456g needed.  This means we don't have enough of the Iron (III) Phosphate to completely react all of the Calcium Carbonate.

In other words, the amount of Iron (III) Phosphate is insufficient to use up all of the Calcium Carbonate, and so it is the Iron (III) Phosphate that is holding us back from completing the reaction.

Thus, the Iron (III) Phosphate is the limiting reagent.

Looking at things another way

If we had started by looking at the 45g of Iron (III) Phosphate, and found out how much Calcium Carbonate we would have needed to react it completely, we would have found that we had more than enough Calcium Carbonate.  Therefore, the Calcium Carbonate was not holding us back from completing the reaction, and the Calcium Carbonate is not the limiting reagent.  Observe:

\(\dfrac{45~\text{g}~FePO_{4}}{} * \dfrac{1~\text{mol}~FePO_{4}}{150.82~\text{g}~FePO_{4}} *\dfrac {3~\text{mol}~CaCO_3}{2~\text{mol}~FePO_{4}} * \dfrac {100.09~\text{g}~CaCO_3} {1~\text{mol}~CaCO_3} = 44.7956~\text{g}~CaCO_3\)

A word of caution!
While for this particular reaction, roughly the same number of grams of each substance is needed to complete the reaction, this is rarely true.  The Molar Masses and the appropriate Mole ratio must be used to find the amount of each substance needed.

Answer:

:)

Explanation:

The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.

Answer:

2,5

Explanation:

Answer:

- the central atom is usually the atom with the lowest subscript in the molecular formula and the atom that can form the most bonds. If all of the atoms usually form the same number of bonds, the least electronegative atom is usually the central atom.

- molecular shape (the shape that a single molecule has) is important in determining how the molecule interacts and reacts with other molecules. Molecular shape also influences the boiling point and melting point of molecules. If all molecules were linear then life as we know it would not exist.

Answer:

Image result for Where do karst regions occur?

Karsts are found in widely scattered sections of the world, including the Causses of France; the Kwangsi area of China; the Yucatán Peninsula; and the Middle West, Kentucky, and Florida in the United States.

Explanation:

Answer:

Middle West Kentucky.

Explanation:

Karst are found in widely scatter sections of the world.

Answer:

5l NO

2

at STP

No. of molecules=

22.4

5

mol=

22.4

5

×N

A

molecules

A) 5ℊ of H

2

(g)

No. of moles=

2

5

mol=

2

5

×N

A

molecules

B) 5l of CH

4

(g)

No. of moles of CH

4

=

22.4

5

mol=

22.4

5

N

A

molecules

C) 5 mol of O

2

=5N

A

O

2

molecules

D) 5×10

23

molecules of CO

2

(g)

Molecules of 5l NO

2

(g) at STP=5l of CH

4

(g) molecules at STP

Therefore, option B is correct.

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Polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

Polarity is indeed a division of electric charge in chemistry that results in a molecule and its chemical groups possessing and electric dipole moment with a negative charges end as well as a positive charge end.

Atoms prefer to adopt the configuration of noble gases in order to achieve stability. As a result, we may deduce that chemical bonding was responsible for atom stability and the formation of molecules. Polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

Therefore,  polar molecules dissolve as well as miscible in polar solvents, while nonpolar molecules dissolve and miscible in nonpolar solvents.

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Answer:

6 grains

Explanation:

The equation of the reaction between NaOH and aspirin is;

C9H8O4(aq) + NaOH (aq) ------>C9H7O4Na(aq) + H2O(l)

Amount of NaOH reacted = concentration × volume = 0.1466 M × 14.40/1000 L = 2.11 × 10^-3 moles

Given that aspirin and NaOH react in a mole ratio of 1:1 from the balanced reaction equation above, the number of moles of aspirin reacted is 2.11 × 10^-3 moles

Hence mass of aspirin reacted = 2.11 × 10^-3 moles × 180.2 g/mol = 0.38 g

If 1 grain = 0.0648 g

x grains = 0.38 g

x= 0.38 g/0.0648 g

x= 6 grains

Answer:

See explanation

Explanation:

PO4{3-} is phosphate
Sulfite's formula is SO3{2-}
Sulfate is SO4{2-}
OH- is hydroxide
Note: {x±} signifies the charge of the entire molecule

The polyatomic ions in question are phosphite ion, sulfite ion, and sulfate ion.

The formula PO3−4 represents the polyatomic ion called phosphite ion. It is composed of one phosphorus atom bonded to three oxygen atoms. The name of the sulfite ion is SO3−2, and it consists of one sulfur atom bonded to three oxygen atoms. Lastly, the sulfate ion has the formula SO4−2, and it is composed of one sulfur atom bonded to four oxygen atoms.

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Taking into account the reaction stoichiometry, 128.4 grams of C are required to produce 10.7 moles of methane.

In first place, the balanced reaction is:

C + 2 H₂ → CH₄

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 1 mole of CH₄ is produced by 12 grams of C, 10.7 moles of CH₄ are produced by how much mass of C?

mass of C= (10.7 moles of CH₄×12 grams of C)÷1 mole of CH₄

mass of C= 128.4 grams

Finally, 128.4 grams of C are required.

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Answer:

100

Explanation:

Answer:

there ya go :) hope it helps

The molality of the sodium ions and the sulfate ions are  44.5 and 10.66 respectively.

How do you calculate molality?

The total number of moles of solute per litre of solution is defined as the molarity of a specific solution. Because, unlike mass, the volume of a system changes with changes in physical circumstances of the system, the molality of a solution is reliant on changes in physical qualities of the system such as pressure and temperature. M, which stands for molarity, represents molarity. The molarity of a solution is one molar when one gramme of solute is dissolved in one litre of solution. As we know, the solvent and solute combine to create a solution, hence the total volume of the solution is measured.

molality of sodium was

=480.57/10.781

=44.5

molality of sulfate was

=28.93/2.712

=10.66

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Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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Answer:

the h20 of water if us water is for us which is for water and trees

Explanation:

Answer:

The waves travel in a direction parallel to direction of the vibration of the medium

The waves travel in a direction parallel to direction of the vibration of the medium

A mechanical wave is defined as an oscillation of matter which is responsible for energy transfer via  medium.

The propagation of  wave is limited by the medium of transmission, the oscillating material which revolve around a fixed point with little translational motion.

A surface wave which is an example of  mechanical wave that propagate  along the interface of two different media in physics. other common examples are Gravity waves on the surface of liquids, ocean waves.

Surface wave can be propagated in a slow way through Earth material and are generally lower in frequency than body waves.

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The molar mass is 3230.8 g/mol

First, we need to know that the formula for the general gas law  is represented as;

PV = nRT

such that the parameters are;

Substitute the values

1 × 2.33 = n × 8.314 × 433.15

Multiply the values, we get;

n = 2.33/ 8.314 × 433.15

Divide the values

n = 6.5 × 10⁻⁴ moles

But, number of moles = mass/molar mass

Molar mass = 2.10/ 6.5 × 10⁻⁴

Molar mass = 3230.8 g/mol

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Answer:

1.389 moles

Explanation:

We are given that

Given mass of ammonium=25.0 g

We have to find the  number of moles in 25.0g of ammonium.

The chemical formula of ammonium \(NH^{+}_4\)

Molar mass of N=14, Molar mass of H=1

Molar mass of ammonium (NH4+)=14+4(4)=18 g/mol

We know that

Number of moles=Given mass/Molar mass

Using the formula

Number of moles of ammonium=\(\frac{25}{18}\)moles

Number of moles of ammonium=1.389 moles

Hence, the number of moles in 25.0g of ammonium=1.389 moles

1) List the known and unknown quantities.

Concentration: 16%(m/m).

Mass of solute: 10 g NaOH.

Mass of solvent: unknown.

2) Set the equation.

Mass percent.

3) Plug in the known values and solve for grams of solvent (water).

.

The 16%(m/m) solution contains 62.5 g H2O.

.