The density of an unknown element in the gaseous state is 1.60 g at 300 K and 1 atm. Which of the following could be the element?
a. He
b. Ne
c. Ar
d.O2
e. Cl2

Answer:

Because 1 ml is equal to 1 cm³

Explanation:

Answer:

The atom is Na, sodium with a net charge of +1 because it lost an electron. it usually has 11 electrons.

Explanation:

sodium has a 11 protons  with an atomic mass of 23-11=12 neutrons.

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the charge on atom is +1.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

Since the number of electrons is 10. The number of protons is 11. So, there is loss of one electron, so the charge on atom is +1.

Therefore, the charge on atom is +1.

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The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer:

1.75 moles

Explanation:

According to CaC₂(s) + 2 H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

2 moles of H20 will produce 1 mole of Ca(OH)2

therefore 3.5 moles of H2O will produce 3.5 x (1/2) = 1.75 moles of Ca(OH)2

Answer:

8.4 moles

Explanation:

Al4C3 + 12 H2O ---> 4 Al(OH)3 + 3 CH4

100g of Al4C3 = 100/144 = 0.7 moles

from the reaction above,

1 mole of Al4C3 = 12 moles of water

0.7 moles of Al4C3 = x moles of water

x = 12×0.7/1 = 8.4 moles

Therefore 8.4 moles of water is needed to react with 100. g of al4c3

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The moles of water are needed to react with 100. g of al4c3 - 8.34 moles.

The reaction can be expressed as -

Al₄C₃ + 12 H₂O → 4 Al(OH)₃ + 3 CH₄

By the equation, it can be said that 1 equivalent of Al₄C₃ reacts with the equivalent of 12 H₂O to generate 4 Al(OH)₃ and 3 CH₄.

the moles = mass + molar mass

then for moles of Al₄C₃ = 100 + 143.959

= 0.6946 moles.

or, 216/143.959

for 100 gram = 21600/143.959

= 150. 0416

moles of H₂O required = \(\frac{12\ mole\ of H_{2} O}{1\ mole\ of\ Al_{4} C_{3}}\)

= 150.0416/18

= 8.43 moles.

Thus, the moles of water are needed to react with 100. g of al4c3 - 8.34 moles.

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0.499 mol Ti

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

23.9 g Ti (Titanium)

Step 2: Identify Conversions

[PT] Molar Mass of Ti - 47.88 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

0.499165 mol Ti ≈ 0.499 mol Ti

Answer:

\(\boxed {\boxed {\sf About \ 0.499 \ grams \ of \ Titanium}}\)

Explanation:

To convert from grams to moles, we must use the molar mass, which can be found on the Periodic Table.

Use this number as a fraction.

\(\frac{47.87 \ g \ Ti}{ 1 \ mol \ Ti}\)

Multiply by the given number of grams: 23.9

\(23.9 \ g\ Ti *\frac{47.87 \ g \ Ti}{ 1 \ mol \ Ti}\)

Flip the fraction so the grams of titanium cancel out.

\(23.9 \ g\ Ti *\frac{ 1 \ mol \ Ti}{47.87 \ g \ Ti}\)

\(23.9 *\frac{ 1 \ mol \ Ti}{47.87 }\)

\(\frac{ 23.9 \ mol \ Ti}{47.87 }\)

Divide.

\(0.499268853 \ mol \ Ti\)

The original measurement had 3 significant figures, so our answer must have the same. For the number we calculated, that is is the thousandth place. The 2 in the ten thousandth place tells us to keep the 9.

\(0.499 \ mol \ Ti\)

There are 0.499 moles of titanium in 23.9 grams.

Answer:

To calculate the pH of a buffer solution, we need to know the concentrations of both the acid and its conjugate base (salt). In this case, we are given that the concentration of acid is 10 times the concentration of the salt.

Let's assume the concentration of the salt is "x" (in any suitable unit). Therefore, the concentration of the acid would be 10x.

In a buffer solution, the pH is determined by the ratio of the concentrations of the acid and its conjugate base (salt). We can use the Henderson-Hasselbalch equation to calculate the pH:

pH = pKa + log([A-]/[HA])

In this equation, pKa is the negative logarithm of the acid dissociation constant (Ka), and [A-] and [HA] are the concentrations of the conjugate base and acid, respectively.

Since the concentration of the acid is 10x and the concentration of the salt is x, we can rewrite the equation as:

pH = pKa + log(x/(10x))

Simplifying further:

pH = pKa + log(1/10)

The log(1/10) is equal to -1, so the equation becomes:

pH = pKa - 1

Without knowing the specific pKa value for the acid-salt pair in the buffer solution, we cannot determine the exact pH. However, if we have the pKa value, we can subtract 1 from it to find the pH of the buffer solution.

Explanation:

b

Reject. While it is true that the citric acid cycle is an important contributor to ATP production, the electron transport chain is also a critical part of cellular respiration and plays a major role in generating ATP.

Cyanide specifically inhibits the electron transport chain by binding to cytochrome c oxidase, a key enzyme in the process, and preventing it from functioning. As a result, cells exposed to moderate amounts of cyanide are unable to produce enough ATP to meet their energy needs and can eventually die. So, exposure to moderate amounts of cyanide can be very harmful to cells and organisms. Citric acid is a weak organic acid found naturally in citrus fruits, especially in lemons and limes. It is a tricarboxylic acid, which means it contains three carboxylic acid functional groups. Citric acid has a sour taste and is often used as a flavoring and preservative in food and beverages. It is also used in many other applications, including as a cleaning agent, a chelating agent in chemical processes, and a pH regulator in cosmetics and pharmaceuticals.

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Answer:

Option 2

Explanation:

Based on the provided steps, we are conducting an experiment involving copper(II) sulfate solution and zinc powder. We are measuring the temperature change that occurs when zinc reacts with copper(II) sulfate.

Measurement:

Initial temperature (°C): This is the temperature of the copper(II) sulfate solution before adding zinc powder. Use a thermometer to measure and record this temperature.

Final temperature (°C): This is the highest temperature reached by the solution after adding the zinc powder and allowing the reaction to occur. Watch the thermometer for a couple of minutes and record the highest temperature observed.

Temperature change (°C): Calculate the difference between the initial and final temperatures. Subtract the initial temperature from the final temperature and record the result as the temperature change.

Follow the steps provided to carry out the experiment and record the corresponding measurements in the table. Make sure to use the pipette to transfer 10 milliliters of copper(II) sulfate solution to test tube 3, then add 0.25 grams of zinc powder to the test tube.

Monitor the temperature using a thermometer and record the initial and final temperatures accurately. Finally, calculate the temperature change by subtracting the initial temperature from the final temperature and record the value in the table.

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The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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Answer:

3 Covalent Bonds and 1 Co ordinate Bond

Explanation:

4 bonds are in NH4¹+

NH4¹+ is the ammonium ion, which consists of a central nitrogen atom (N) and four hydrogen atoms (H). Nitrogen is located in group 15 of the periodic table and has 5 valence electrons. Hydrogen, on the other hand, has 1 valence electron.

To achieve a stable electron configuration, nitrogen needs to share electrons with the hydrogen atoms. Each hydrogen atom can form a single bond with the nitrogen atom by sharing its valence electron.

In NH4¹+, all four hydrogen atoms form single bonds with the central nitrogen atom. These bonds are represented by lines connecting each hydrogen atom to the nitrogen atom.

So, NH4¹+ has 4 bonds. Each bond represents a pair of electrons shared between the nitrogen atom and a hydrogen atom. The bonding arrangement ensures that the nitrogen atom has a complete octet (eight valence electrons) and each hydrogen atom has two electrons, following the stable configuration of helium.

The "+1" charge on NH4¹+ indicates that the ion has lost one electron, resulting in a positive charge. However, the number of bonds remains the same regardless of the charge.

Therefore, the correct answer is 4 for the number of bonds in NH4¹+.

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The number of moles of cesium chloride produced 0.183 moles.

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.

According to this question, the chemical formula for cesium chloride is CsCl. A chemist measured the amount of cesium chloride produced during an experiment. She finds that 30.8 g of cesium chloride is produced.

The molar mass of Cesium chloride is 168.36 g/mol

Moles = 30.8g ÷ 168.36g/lol

moles = 0.183 moles

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the maximum amount of product that can be formed is 124.39 g SO₃, and there will be 36.8 g of excess O₂ left over.

To find the amount of excess reagent, you need to first determine which reactant is limiting and which is in excess.

Determine the limiting reagent:

Use stoichiometry to determine how much product can be formed from each reactant:

mol SO2:

2 SO₂ + O₂ -> 2 SO₃

2 mol SO₃/2 mol SO₂ = 1 mol SO₃/mol SO₂

1 mol SO₃ = 80.06 g SO₍₃₎

From 2.7 mol O₂

2 SO₂ + O₂ -> 2 SO₃

1 mol SO₃/1 mol O₂ = 1 mol SO₃/mol O₂

1 mol SO₃ = 80.06 g SO₃

2.7 mol O₂ x (1 mol SO₂/1 mol O₂) x (80.06 g SO₂/mol SO₂) = 216.45 g SO₂

Since the amount of SO₂ produced from 3.1 mol of SO₂ is less than the amount produced from 2.7 mol of O₂, SO₂ is the limiting reagent.

Calculate the amount of excess reagent:

To find the amount of excess O₂, use the balanced equation to determine how much O₂ is required to react with all of the SO₂:

2 SO₂ + O₂ -> 2 SO

3.1 mol SO2 x (1 mol O₂/2 mol SO2) = 1.55 mol O₂

Subtract the amount of O₂ used from the initial amount of O₂:

2.7 mol O₂ - 1.55 mol O2 = 1.15 mol O₂

Finally, convert the excess O₂ to mass:

1.15 mol O₂ x 32.00 g/mol = 36.8 g O₂

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Answer:

Ultraviolet

Explanation:

It doesn't use much energy and so it creates ultraviolet light.

Answer:

The answer is provided below

Explanation:

To determine the metal is gold we will use the following steps

Take a full water container

Place the metal in the container

Collect the water that spills out due to the placement of the metal

measure the mass of collected water.

Calculate the value in terms of the density of water, it will be the volume of metal.

Calculate the mass of the metal

Use the following formula to calculate the density of the metal

Density = Mass / Volume

Now compre the resulted density to the density of pure gold.

The pH can be defined as the negative logarithm of the hydrogen ion concentration of the solution.

What we call the pH can be defined as the negative logarithm of the hydrogen ion concentration of the solution. We are aware that we can use the relation [H+]  [OH-]  = 1 * 10^-14 to handle the enormity of this problem.

Now, let us go about solving the problems;

1. pH = -log(1 x 10-7) = 7

2.  [H+]=  1 * 10^-14/ 1 x 10^-3

pH =  -log(  1 * 10^-11)

pH = 11

3. pH = -log( 1 x 10^-2)

pH = 2

4. pH = -log(  1 x 10^-10)

pH = 10

5.  [H+]=  1 * 10^-14/ 1 x 10^-8

[H+]=  1 * 10^-6

pH = 6

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(1) The quantity of heat required to melt 175 g Cu is 35.88 kJ.

(2) The substance that releases 21.2 kJ of energy when 1.42 mol of it freezes is iron.

Heat of fusion is the energy required to melt 1 mole of a substance.

The heat energy required to vaporize 1 mole of a substance has been heat of vaporization.

Heat of fusion of copper (Cu) is given as 13 kJ/mol

Number of  moles of 175 g of copper = 175/63.5 = 2.76 moles

Q = nΔH

Q = 2.76 mol  x 13 kJ/mol = 35.88 kJ

Thus, the quantity of heat required to melt 175 g Cu is 35.88 kJ.

ΔH(fus) = Q/n

where;

ΔH(fus) = 21.2 kJ / 1.42 mol

ΔH(fus) = 14.93 kJ/mol

From the table the substance with latent heat of fusion of 14.9 kJ/mol is iron.

Thus, the substance that releases 21.2 kJ of energy when 1.42 mol of it freezes is iron.

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Answer:

The quantity of heat required to melt 175 g Cu is 35.8 KJ

The Substance that releases 21.2 KJ of energy when 1.42 mol of it freezes is Fe

Explanation:

The person above is incorrect.

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:a

Explanation:

ddk

Answer:

1.6 g/L

Explanation:

To calculate the concentration of ibuprofen in a bottle of Motrin, we need to divide the amount of ibuprofen (in grams) by the volume of the bottle (in liters).

First, we need to convert the volume of the bottle from milliliters (mL) to liters (L):

500 mL = 0.5 L

Now we can calculate the concentration:

Concentration = Amount of ibuprofen / Volume of bottle

Concentration = 0.8 g / 0.5 L

Concentration = 1.6 g/L

Therefore, the concentration of ibuprofen in a bottle of Motrin is 1.6 g/L.

Answer:

see the photo

Explanation:

it was the answer

Limitations of using synthetic polymers are:

A synthetic polymers is defined as the material which is mainly made from polyester, teflon-like material or nylon.

Polypropylene is best example of synthetic polymers.

These polymers are not eco-friendly nor they are sustainable or green. They are type of non-biodegradable.

These synthetic polymers can be easily grouped into different big quantities. These are generally not very expensive.

Thus, we concluded that landfills can easily fill up with the synthetic polymers and they are not biodegradable are main limitations of using synthetic polymers.

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Answer: D

D

Explanation:

The mass and velocity of an object determines its kinetic energy. The kinetic energy of the substance with mass of 10 kg and speed of 5 m/s is 125 J. Hence, option b is correct.

Kinetic energy of an object is generated by virtue of its motion. The kinetic energy is dependent to the mass and speed of the object by the expression written below;

Ke  = 1/2 mv²

Therefore, as the mass or speed or both increases kinetic energy increases. When an object starts moving its potential energy gets converted to kinetic energy.

Given that mass = 10 Kg

speed = 5 m/s

then Ke  = 1/2 10 kg × 5 m/s   × 5 m/s =  125 J

Therefore, the kinetic energy of the object is 125 J, option c is correct.

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Answer:

The real acidity of milk is due to lactic acid. This is never found in milk when it is first drawn from the udder. It is produced by the action of the lactic acid organisms on the milk sugar. The so-called apparent acidity of milk is what gives fresh milk its acid reaction.

The loss of mass in the process of fission can be calculated using Einstein's famous equation, E = mc^2, where E is the energy, m is the mass, and c is the speed of light.

The total kinetic energy of the fragments after fission is 200 MeV, which is equivalent to \(200 x 10^6 eV\). Converting this to joules, we have 2\(00 x 10^6 eV x 1.6 x 10^-19 J/eV = 3.2 x 10^-13 J.\)

Using E = mc^2, we can find the mass lost in the process: \(m = E/c^2 = (3.2 x 10^-13 J) / (3 x 10^8 m/s)^2 = 2.3 x 10^-25 kg.\)

So, the mass lost in the process of fission is approximately \(2.3 x 10^-25\)kilograms. This mass loss is converted into the energy released in the form of kinetic energy of the fragments, heat, and light.

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Answer:

orbital shape.

Explanation:

1) There are four quantum numbers to describe the electrons. These are:

i) Principal quantum number (n)

ii) Azimuthal quantum number (ℓ), also called angular momentum quantum number.

iii) Magnetic quantum number (m)

iv) Spin quantum number (s)

2) The principal quantum number tells the main energy level. It can be 1, 2, 3, 4, 5, 6, 7. It is related to the orbital size. 1 is a small orbital, 7 is a big orbital.

2) The Azimuthal quantum number (ℓ) or angular momentum quantum number may be a number between 0 and n - 1.

It tells the kind of orbital, which is its shape

The correspondence is:

0 = s orbital,

1 = p orbital,

2 = d orbital,

3 = f orbital.

3) Magnetic quantum number (m) tells the orientation. It can be from - ℓ to + ℓ

For example when ℓ = 1, the orbital is p, and the magnetic quantum number may be -1, 0, or +1, which corresponds to px, py, pz: the orientation of the p orbital in the space.

4) Spin quantum number (s) can be either +1/2 or -1/2.

JM~ Hope this helps you out