18. Which two particle diagrams each represent a sample of one substance? Key O = atom of oxygen = atom of hydrogen 0 = atom of chlorine 8 OO 1 நம் மும் 20 2000 (1) I and III (3) II and IV (2) II and III (4) I and II​

1. The limiting reagent would be sulfur.

3. The amount of product formed would be 34.4 grams

2. The amount of excess copper that remains would be 24.96 grams.

Copper and sulfur react to form copper (II) sulfide according to the following balanced equation:

\(Cu + S -- > CuS\)

From the balanced equation of the reaction, the mole ratio of copper to sulfur is 1:1.

Recall that, mole = mass/molar mass

Mole of 48.2 grams of copper = 48.2/64

                                                  = 0.75 mol

Mole of 35.0 grams of sulfur = 35/98

                                               = 0.36 mol

Since the stoichiometric mole ratio is 1:1, it means that sulfur is the limiting reactant or reagent while copper is in excess.

The excess amount of copper would be: 0.75 - 0.36 = 0.39 mol

Mass of 0.39 mol copper = 0.39 x 64 = 24.96 grams

With sulfur being the limiting reactant, the equivalent amount of CuS formed will be 0.36 mol considering that the mole ratio is 1:1.

Mass of 0.36 mol CuS = 0.36 x 95.6

                                      = 34.4 grams.

In other words, the limiting reactant is sulfur, the amount of product formed is 34.4 grams, and the amount of excess copper is 24.96 grams.

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The element that helps the heart and is found in nuts and legumes is magnesium.

In this case, we are being asked about the element that promotes normal heart rhythm and muscle function and can be found in nuts, legumes, whole-grain products, and dark green vegetables. We have to know that this element is one of the key elements that are important to the health of a person.

Now we have to look at the options tat we have and see that magnesium is the element that is abundant in the nuts and the legumes and have been linked to the effective function of the heart.

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Explanation:

1. The IUPAC name of N is nitrogen.

2. Nitrogen dioxide

3.The IUPAC name of O is oxygen

4.The IUPAC name of OH is hydroxyl.

The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.

IUPAC names for the given compounds are:1.1. N: Nitrogen

The IUPAC name of N is nitrogen.

It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide

Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.

The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen

Explanation: The IUPAC name of O is oxygen.

It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.

X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.

Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.

It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.

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Note: The complete question is given below

Provide the IUPAC names for the following compounds:

\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)

C6H5CH(CH3)2

H2NCH2CH2CH2CH2CH2NH2

CH3CH2CH2CH2CH2OH

CH3CH2CH2CHOHCH3

Answer:

The specification of the query in the discussion is characterized below.

Explanation:

The polarity would be determined by the shape of the molecule and the arrangement of the atoms.

To determine the polarity of a polyatomic molecule, you need to consider the polarity of its individual bonds and the molecular geometry of the molecule.

The polarity of a bond is determined by the electronegativity difference between the atoms that form the bond. If the electronegativity difference is large, the bond is polar, and if it is small, the bond is nonpolar.

Once you have determined the polarity of the individual bonds, you can use the molecular geometry of the molecule to determine its overall polarity. To do this, you need to consider the arrangement of the atoms in the molecule and the direction of the polarity of each bond.

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Answer:

molar mass = 79.90 g/mol

Explanation:

Argon as a gas is Ar₂. Molar mass, as found on a standard IUPAC Periodic table, located on most high school chemistry and physics textbooks, as well as data sheets in examinations, is 2×39.95 = 79.90 g/mol.

The empirical formula of the compound is C₂H₁₆S₂N₃O.

The moles of each element is as follows::

For CO₂:

Carbon (C) has a molar mass of 12.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of C in CO₂ = 2.08 g / 12.01 g/mol = 0.173 moles

Moles of O in CO₂ = 2.08 g / 16.00 g/mol = 0.130 moles

For H₂O:

Hydrogen (H) has a molar mass of 1.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of H in H₂O = 1.28 g / 1.01 g/mol = 1.27 moles

Moles of O in H₂O = 1.28 g / 16.00 g/mol = 0.080 moles

For SO₃:

Sulfur (S) has a molar mass of 32.06 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of S in SO₃ = 4.77 g / 32.06 g/mol = 0.149 moles

Moles of O in SO₃ = 4.77 g / 16.00 g/mol = 0.298 moles

For HNO₃:

Hydrogen (H) has a molar mass of 1.01 g/mol.

Nitrogen (N) has a molar mass of 14.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of H in HNO₃ = 3.48 g / 1.01 g/mol = 3.45 moles

Moles of N in HNO₃ = 3.48 g / 14.01 g/mol = 0.248 moles

Moles of O in HNO₃ = 3.48 g / 16.00 g/mol = 0.217 moles

The simplest whole-number ratio of the elements will be:

Carbon: 0.173 moles / 0.080 moles ≈ 2.16

Hydrogen: 1.27 moles / 0.080 moles ≈ 15.88

Sulfur: 0.149 moles / 0.080 moles ≈ 1.86

Nitrogen: 0.248 moles / 0.080 moles ≈ 3.10

Oxygen: 0.080 moles / 0.080 moles = 1

Therefore, the empirical formula is C₂H₁₆S₂N₃O.

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The value of the pressure calculated from the Vander Waal equation is slightly less than that is calculated from the ideal gas equation.

We know that the ideal gas equation assumes that there is no interaction that exists between gas molecules. The ideal gas equation corrects the ideology with the addition of constants that take care of possible interaction between gases.

Now, using the ideal gas equation;

PV =nRT

P = ?

V =  30.0L

T = 600.0K

n = 1.00 mol

R = 0.082 atmLK-1mol-1

P = nRT/V

P =  1.00 mol *  0.082 atmLK-1mol-1 *  600.0K/30.0L

P = 1.64 atm

Using the Vander Waal equation

a = 6.49

b = 0.0562

Thus;

P = RT/V - b  -  a/V^2

P = 0.082 * 600.0/30.0 - 0.0562 - 6.49/(30)^2

P = 49.2/29.9438 - 6.49/900

P = 1.64 - 0.00721

P = 1.63 atm

Thus the value of the pressure calculated from the Vander Waal equation is slightly less than that is calculated from the ideal gas equation.

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Answer:

Mercury has a density of 13.6g/mL

The balanced chemical equation is O₂ (g) + C (s) → CO₂ (g).

The chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons can be used to create covalent chemical bonds. It is nonmetallic.

When carbon combines with oxygen gas to generate carbon dioxide gas, the balanced equation is as follows:

O₂ (g) + C (s) → CO₂ (g)

While oxygen is a gas and has the chemical symbol O, carbon is a solid element with the symbol C.

Carbon dioxide gas is created when carbon combines with oxygen gas as follows:

O₂ (g) + C (s) → CO₂ (g)

According to the equation above, each element in the equation has an equal amount of atoms, hence the equation is said to be balanced.

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Answer:

Explanation:

Small changes in the chemical nature of polysaccharides can make a big difference in how they work in our bodies. Polysaccharides are complex carbohydrates found in things like fiber and medicines. Even tiny changes in their structure can affect how they are digested, how they interact with cells, and their overall impact on our health. Scientists can use these changes to create materials with specific properties or develop new treatments. So, even small tweaks in polysaccharides can have a significant impact on how they function in our bodies.

Answer:

12%

Explanation:

Answer:

3-12%

Explanation:

Im not completely sure if this is accurate, but hope with somewhat helps.

Answer:

1.) 2 Fe (s) + O2 (g) --> 2FeO (s)

2.) 4 Fe (s) + 3O2 (g) --> 2 Fe2O3

The mass of butane gas at the given volume and Standard temperature and pressure is 0.0022g.

The Ideal gas law or general gas equation emphasizes on the state or behavior of a hypothetical ideal gas. It states that "the pressure multiplied by volume is equal to moles multiply by the universal gas constant multiply by temperature.

It is expressed as;

PV = nRT

Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )

Given the data in the question;

PV = nRT

n = PV / RT

n = ( 1.0atm × 3.00L ) / ( 0.08206 Latm/molK × 273.15K )

n = 3.00Latm / 22.41 Latm/mol

n = 0.13mol

Now, since Molar mass of brutane gas is 58.12 g/mol.

Mass = n × Molar mass

Mass = 0.13mol × 58.12 g/mol

Mass = 0.0022g

Therefore, the mass of butane gas at the given volume and Standard temperature and pressure is 0.0022g.

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Answer:

\(V_2=583.3mL\)

Explanation:

Hello,

In this case, for the given constant amount and pressure of the, we apply the Charles' law which allows us to understand the volume-pressure behavior as a directly proportional relationship:

\(\frac{V_1}{T_1} =\frac{V_2}{T_2}\)

Thus, since we need to compute the volume after the temperature increase (which must be expressed in absolute Kelvins), we obtain V2 as:

\(V_2=\frac{V_1T_2}{T_1} =\frac{350.0mL*(227+273.15)K}{(27+273.15)K}\\ \\V_2=583.3mL\)

Best regards.

The structural formula of butanol is C4H9OH. It consists of a chain of four carbon atoms, with a hydroxyl (-OH) group attached to one of the carbon atoms. Butanol has several structural isomers, which have the same molecular formula but different structural formulas.

A structural isomer is a compound that has the same molecular formula as another compound but has a different arrangement of its atoms. A string of 4 C atoms are bonded above, below, left, and right to H, except the second C, which is bonded below to O, which is bonded below to H is a structural isomer of butanol.

This is called butan-2-ol. The structural formula of butan-2-ol is CH3CH(OH)CH2CH3. In this isomer, the hydroxyl group is attached to the second carbon atom in the chain, whereas in butanol, the hydroxyl group is attached to the first carbon atom in the chain.

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Answer:

D

Explanation:

best choice, makes the most sense

In the scientific method, conducting an experiment involves designing and performing controlled experiments to test a hypothesis and the correct option is option B.

Scientists manipulate the independent variable while controlling other variables (dependent and controlled variables) to observe and measure the effect on the dependent variable.

By controlling variables, scientists can isolate the factors that influence the outcome, ensuring that any observed changes are a result of the manipulated variable and not other unrelated factors. This step allows for the collection of reliable data, which is essential for drawing meaningful conclusions based on the evidence gathered from the experiment.

Thus, the ideal selection is option B.

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The number of moles of acetone is 4.1 moles.

Let us recall that specific gravity refers to the ratio of the density of a substance to the density of water. Also noting that the density of water has been set to 1 g/mL, the density of the acetone solution is 0.784 g/mL.

Density = mass/volume

mass = Density * volume

mass = 0.784 g/mL *  300.0 mL

= 235.2 g

Number of moles = mass/molar mass

Molar mass of acetone = 58 g/mol

Number of moles of acetone = 235.2 g/ 58 g/mol

= 4.1 moles

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Answer:

A.  any absorbance of light by the solvent AND the cuvette needs to be accounted for

Explanation:

Blank calibrations are usually carried out on the spectrometer to eliminate and account for any readings that would come from absorptions of the curvette, solvents/reagents or anything that is not the main analyte we are testing for.

Hence the blank solution does not contain the analyte itself. Fingerprints should be removed from the curvette as practice. Hence the most suitable answer amongst the options is A.

I hope this was clear ad most of all, helpful.

The blank has been resulted in for accounting the absorbance of light by the solvent and the cuvette. Thus, option A is correct.

For performing the spectroscopic measurement of an analyte, the system has been blanked with the cuvette and the solvent. This has been performed as the solvent medium, the environment and the cuvette have their own absorption.

The analysis of the analyte without performing blank has consisted of the absorbance of the solvent and cuvette as well. Thus, in order to attain a pure analyte absorbance, the spectrometer has been analyzed with the blank.

The blank has been resulted in for accounting the absorbance of light by the solvent and the cuvette. Thus, option A is correct.

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A. DECREASING both wave frequency and wavelength.

B. DECREASING the wave frequency and INCREASING the wavelength.

According to the formula E=hf

where;

An increase in frequency leads to an increase in energy. Conversely, a decrease in frequency leads to a decrease in energy.

The wavelength of the wave does not directly affect the energy of the wave, but it is inversely proportional to the frequency. This means that as wavelength increases, frequency decreases and vice versa.

Therefore, option A, which involves decreasing both wavelength and frequency, would lead to a decrease in energy. Option B involves decreasing frequency and increasing wavelength, which would also result in a decrease in energy. Option C involves increasing both wavelength and frequency, which would lead to an increase in energy. Finally, option D involves increasing frequency and decreasing wavelength, which would also lead to an increase in energy.

Thus, the correct answer is either A or B, both of which involve decreasing frequency.

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Answer: the answer is B

Explanation: its correct

Answer:

0.648 g

Explanation:

Step 1: Write the balanced equation

2 Na(s) + 2 H₂O(l) ⇒ 2 NaOH(aq) + H₂(g)

Step 2: Calculate the partial pressure of H₂

The total pressure (P) is equal to the sum of the partial pressures of hydrogen and water vapor.

P = pH₂O + pH₂

pH₂ = P - pH₂O

pH₂ = 759 mmHg - 23.8 mmHg = 735 mmHg

Step 3: Convert "pH₂" to atm

We will use the conversion factor 1 atm = 760 mmHg.

735 mmHg × 1 atm/760 mmHg = 0.967 atm

Step 4: Convert "25°C" to K

We will use the following expression.

K = °C + 273.15 = 25°C + 273.15 = 298 K

Step 5: Calculate the moles of hydrogen (n) formed

We will use the ideal gas equation.

P × V = n × R × T

n = P × V/R × T

n = 0.967 atm × 8.11 L/(0.0821 atm.L/mol.K) × 298 K = 0.321 mol

Step 6: Calculate the mass corresponding to 0.321 moles of hydrogen

The molar mass of H₂ is 2.02 g/mol.

0.321 mol × 2.02 g/mol = 0.648 g

Answer:

1.92704e24 atoms

Explanation:

Using Avogadro's number, you can set up a stoichiometric equation to find the number of atoms.

There are 1.926 × 10²⁴ atoms in 3.2 moles of sulfur (S).

The number of atoms in a substance can be calculated by multiplying the number of moles by Avogadro's number.

Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³.

According to this question, there are 3.2 moles of sulfur. The number of atoms can be calculated as follows:

no of atoms = 6.02 × 10²³ × 3.2

no of atoms = 19.26 × 10²³

no of atoms = 1.926 × 10²⁴

Therefore, 1.926 × 10²⁴ atoms are in 3.2 moles of sulfur.

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Answer:

There would be \(11\) electrons in each sodium atom.

Explanation:

Atoms are neutral. In other words, the positive and negative electrical charges in each atom are balanced.

Each atom contains:

For the positive and negative electrical charges in an atom to balance each other, the number of protons and electrons in that atom should be equal.

For example, the \(11\) protons in the sodium atom in this question would have contributed an electrical charge of \((+11)\; {\rm e}\) to the atom. Balancing that charge would require an additional electrical charge of \((-11)\; {\rm e}\), which corresponds to exactly \(11\!\) electrons.

Answer: (Kr) 5s2

Explanation:

Apex

The heat capacity for the metals are;

Aluminum -  0.89

Copper - 0.11

Iron - 0.44

Lead - 0.12

The specific heat of a substance is denoted by the symbol "C" and is typically measured in units of J/g·°C (joules per gram per degree Celsius) or cal/g·°C (calories per gram per degree Celsius).

The specific h

We have that;

For Aluminum;

c = 4.184 * 39.85 * 4.7/11.98 * 72.9

= 783.6/873.3

= 0.89

For Copper;

c =  4.184 * 12.14 * 1.9/12.14 * 75.4

= 96.5/915.3

= 0.11

For Iron

c =  4.184 * 40.24 * 2.4/12.31 * 75.1

= 404.1/924.5

= 0.44

For Lead

c = 4.184 * 39.65 * 0.7/12.46 * 76.7

c = 116.1/955.68

= 0.12

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Answer:

What's the equation?

Answer:

14.5 g

Explanation:

its true

Answer: for me everything ig

Explanation:

Answer:

C

Explanation:

that is the only dependent variable

Answer: The pH of solution is 10.

The pOH of the solution is 4.

Explanation:

pH is the negative logarithm of concentration of hydrogen ion.

As given concentration of acidic solution is \(1.00 \times 10^{-10} M\). Therefore, pH of the solution is calculated as follows.

\(pH = -log [H^{+}]\\= -log (1.00 \times 10^{-10})\\= 10\)

The relation between pH and pOH is as follows.

pH + pOH = 14

pOH = 14 - pH

= 14 - 10

= 4

Thus, we an conclude that pH of solution is 10 and pOH of the solution is 4.