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The number of molecules or the number of atoms that the oxygen has has is 9.6 * 10^22 molecules/ atoms.

We have to note that the number of the molecules of the oxygen that we have can be obtained by the use of the hypothesis that have been put forward by Avogadro.

We know that;

22.4 L of oxygen is contained in one mole of oxygen

3.5 L of oxygen would contain 3.5 * 1/22.4

= 0.16 moles of oxygen

If 1 mole of oxygen contains 6.02 * 10^23 molecules /atoms

0.16 moles of oxygen would contain 0.16 *  6.02 * 10^23/1

=9.6 * 10^22 molecules/ atoms

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Missing parts;

How many molecules of O2 are in a 3.5-liter container? How many atoms?

Answer:

phosphorus

Explanation:

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The element having 16 neutrons in group 15 for the periodic table is phosphorus. Also known as the nitrogen family, group 15 is.

Each of the chemical substances that make up Group 15 (Va) in the periodic table of elements belong to the nitrogen group. Nitrogen (N), phosphorous (P), arsenic (As), arsenic (Sb), bismuth (Bi), plus moscovium (Mc) make up the group. While chemically distinct from one another, the elements exhibit certain basic commonalities in their behaviour, and these similarities are a result of the shared characteristics of their atoms' electronic structures. The element having 16 neutrons in group 15 for the periodic table is phosphorus. Also known as the nitrogen family, group 15 is.

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Answer:

B and C

Explanation:

is it multiple choice question??

Van der Waals forces are the interaction between the molecules and the atoms. It increases with an increase in the molecular size and the number of electrons. Thus, options B and C are correct.

Van der Waals forces are the weak forces of attraction and repulsion present between the atoms and the molecules of the compounds. They are also called London Dispersion Forces and dipole-dipole forces.

An increase in the number of electrons and size of the molecule increases the surface area and the electron cloud which in turn, increases the Van der Waals force.

The intermolecular force increases as in large atoms or molecules the valence are held loosely as they are far from the nucleus or the center of the atom.

Therefore, the size and the electron increase the Van der Waals force.

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The formula for the new ion is HPO₄²⁻. The name of the new ion is Hydrogen phosphate.

Hydrogen phosphate is found in a variety of natural systems. It is conjugated to phosphate (PO₄)³⁻ and dihydrogen (D₂PO₄)⁻phosphate. Hydrogen phosphate and its salts are commonly used in fertilizer applications and in cooking.

The majority of hydrogen phosphate salts are colorless, water-soluble, and non-toxic. Hydrogen phosphate is formed by the hydrolysis of water (H₂O) with an anion (P₂O₇)⁴⁻.

In the opposite reaction, a proton is added to the hydrogen phosphate to make it a base, and it is then reformulated with dihydrogen phosphate.

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Answer:

your brain spinal cord and nerves

When 8.0 mL of water is added to 2.0 mL of a 0.500 M NaOH solution, the concentration of NaOH is changed. To find the new concentration, we need to consider the dilution formula. The formula is C1V1 = C2V2, where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

In this case, the initial concentration (C1) is 0.500 M, the initial volume (V1) is 2.0 mL, the final volume (V2) is the sum of 8.0 mL (added water) and 2.0 mL (initial NaOH solution), which is 10.0 mL. We can substitute these values into the dilution formula to solve for the final concentration (C2).

Therefore, the concentration of NaOH is changed to 0.100 M when 8.0 mL of water is added to 2.0 mL of a 0.500 M NaOH solution.

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Thus, the rate of disappearance of O₂ is 0.37 mol L⁻¹ s⁻¹ , the rate of appearance of CO₂ is 0.2467 mol L⁻¹ s⁻¹

The rate at which a chemical reaction moves forward is known as the reaction rate in chemistry. It is frequently defined in terms of either the concentration of a reactant that is consumed in a unit of time or the concentration of a product that is generated in a unit of time (amount per unit volume).

The equation becomes:

C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(g)

Rate of reaction = \(-\frac{d[C_2H_4]}{dt}\) = \(-\frac{1}{3} \frac{d[O_2]}{dt}\) = \(+\frac{1}{2} \frac{d[CO_2]}{dt}\) = \(+\frac{1}{2} \frac{d[H_2O]}{dt}\)

It is given that, the rate of disappearance of O₂ is 0.37 mol L⁻¹ s⁻¹.

So, \(-\frac{1}{3} \frac{d[O_2]}{dt} =\) \(+\frac{1}{2} \frac{d[CO_2]}{dt}\)

or,  \(-\frac{1}{3} \frac{d[O_2]}{dt}\)  × (-0.37 mol L⁻¹ s⁻¹) = \(\frac{d[CO_2]}{dt}\)

or, \(\frac{2}{3} \frac{d[O_2]}{dt}\)  × (0.37 mol L⁻¹ s⁻¹) = \(\frac{d[CO_2]}{dt}\)

or, 0.2467 mol L⁻¹ s⁻¹ = \(\frac{d[CO_2]}{dt}\)

Thus, the rate of disappearance of O₂ is 0.37 mol L⁻¹ s⁻¹ , the rate of appearance of CO₂ is 0.2467 mol L⁻¹ s⁻¹

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If 170 milligrams of a radioactive substance decays to 85 g after 16 hours. Then, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

The decay of the radioactive substance follows an exponential decay equation of the form:

\(N(t) = N_{o} \times e^{-kt}\)

Where:

N(t) is the amount of substance remaining at time t

N₀ is the initial amount of substance

k is the decay constant

t is the time elapsed

Given to us is N₀ = 170 mg and N(16) = 85 mg. We can use this information to find the decay constant, k.

\(85 = 170 \times e^{-k \times 16}\)

Dividing both sides by 170:

\(0.5 = e^{-k \times 16}\)

To solve for k, we can take the natural logarithm (ln) of both sides:

ln(0.5) = -k × 16

from this, the value of k comes out to be:

k = 0.0431

Now we can use the decay equation to find the amount of substance remaining after 21 hours, N(21):

\(N(21) = 170 \times e^{-0.0431 \times 21}\)

Calculating this expression:

N(21) = 75.2

Therefore, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

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Answer:

The interaction between the tectonic and the hydrologic systems causes constant recycling of the materials of the Earth's crust. Rocks are heated, metamorphosed, melted, weathered, sediment is transported, deposited and lithified, then it may be metamorphosed again in yet another cycle.

Explanation:

Water is able to dissolve polar or ionic solutes.

Water is a liquid that is transparent or colourless, tasteless and odourless which form the Earth hydrosphere and can be use for fringing, cooking, washing, feeding animals and so on.

Polar or ionic solvents dissolve polar or ionic solutes. Polar Substance are substances that can dissolve in water completely or polar solvent.

Water is a polar solvent and it can dissolve polar solute.

Therefore, Water is able to dissolve polar or ionic solutes.

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Answer:

the answer is d ionic and polar

Explanation:

just took the quiz and got it right

The correct answer is d. an absorption at 3410 cm-1.

Infrared (IR) spectroscopy can be used to identify functional groups in organic molecules. The OH functional group in alcohols exhibits a characteristic absorption band around 3300-3600 cm-1. This absorption is due to the stretching vibration of the O-H bond.

In the isomer CH3CH2OH (ethanol), there is an -OH group present which will give rise to a strong absorption at around 3410 cm-1. In contrast, in CH3OCH3 (dimethyl ether), there is no -OH group, and therefore no absorption at this frequency.

Absorption at 3070 cm-1 (option a) is associated with the C-H stretch of an aromatic ring or the C-H stretch of an alkyne, and is not useful for distinguishing between these two isomers.

Absorption at 1100 cm-1 (option b) is associated with the C-O stretch of an ether, which is present in CH3OCH3, but also in CH3CH2OH, making it non-specific.

Absorption at 1500 cm-1 (option c) is associated with the C=C stretch of an alkene or the N-H bend of an amine, and is not useful for distinguishing between these two isomers.

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The atomic radius, Pauling ionic radius, and first ionization energy of Bromine (Br), Chlorine (Cl), Magnesium (Mg), and Sodium (Na) are given in the attachment.

A chemical element's atomic radius, which is typically the average or normal distance between the nucleus's center and the outermost isolated electron, serves as a gauge for the size of its atom.

Only by measuring the separation between the centers of two adjacent atoms and halving that distance can one determine the radius of an atom.

The ionic radius is the size of an ion.

The first ionization energy is the energy required to remove the first electron from an atom

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Approximately 24.55 cm^3 of oxalic acid must be added to sufficient water to give a 1.500 liter solution with a formal concentration of 0.300 F.

To find the volume of oxalic acid needed to make a 1.500 liter solution with a formal concentration of 0.300 F, we need to use the equation:

Formal concentration (F) = (moles of solute) / (volume of solution in liters)

First, we need to calculate the moles of oxalic acid required. The formal concentration (F) is given as 0.300, so:

0.300 = (moles of oxalic acid) / 1.500

Rearranging the equation, we find:

moles of oxalic acid = 0.300 * 1.500

moles of oxalic acid = 0.450

Next, we can calculate the mass of oxalic acid needed using its molecular mass:

mass of oxalic acid = moles of oxalic acid * molecular mass

mass of oxalic acid = 0.450 * 90.03

mass of oxalic acid = 40.5145 g

Finally, we can calculate the volume of oxalic acid needed using its density:

volume of oxalic acid = mass of oxalic acid / density

volume of oxalic acid = 40.5145 g / 1.65 g/cm^3

volume of oxalic acid = 24.55 cm^3

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In the given diagram,  the first atom contains one valence electron and the second have 7 valence electrons. The first atom donates the one electron to the second atom and both achieve octet and forms and ionic compound.

Ionic compounds are formed between a metal and non-metal. Metals are rich in electrons and easily loss one or more electrons to other atoms. Non-metals are electron deficient and can gain electron from metals. These electron loss and gain between atoms forms the ionic bond between them.

In the diagram the first atom contains total 11 electron of which one is valence electron. By donating this extra electron the atom can achieve octet. The second one contains total 17 electrons  of which  7 are valence electrons, thus need one more electron to attain octet.

The first atom represents sodium atom and the second one is chlorine atom. Sodium donates its valence electron to Cl and form the ionic compound NaCl.

Na⁺ + Cl⁻ ⇒ NaCl

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Answer:

50%

Explanation:

Expected measurement required = 10g

Actual measurement observed = 15g

The percentage error is given as proportion the difference between the actual and expected measurement or values and the expected value value expressed as a percentage.

[(Actual - Expected) / Expected] × 100%

[(15 - 10) / 10)] × 100%

(5 / 10) × 100%

0.5 × 100%

50%

Therefore, the percentage error in the measurement is 50%

The conversion of the following Fahrenheit temperatures to the Celsius and Kelvin scales are as follows:

a. –459°F, an extremely low temperature = -273 °C; 0 K

b. –40.°F, the answer to a trivia question = -40°C; 233.15 K

c. 68°F, room temperature = 20°C; 293.15 K

d. 7 × 10⁷ °F, temperature required to initiate fusion reactions in the sun = 3.85 × 10⁷ °C; 3.85 × 10⁷ K

a. –459°F, an extremely low temperature

When we have to convert a given temperature from Fahrenheit to Celsius, we use the following formula:

F = 9/5 C + 32

Where C is the Celsius temperature and F is the Fahrenheit temperature.

(i) To convert -459°F to Celsius, we have to put the value in the above formula and get the Celsius temperature.

F = 9/5 C + 32

-459 = 9/5 C + 32

C = (-459 - 32) × 5/9 = -273 °C is the Celsius temperature of -459°F

(ii) To convert -459°F to Kelvin, we add 273 to the Celsius temperature.

K = C + 273

K = -273 + 273 = 0 K is the Kelvin temperature of -459°F.

b. –40.°F, the answer to a trivia question

(i) To convert -40°F to Celsius, we use the given formula.

F = 9/5 C + 32

-40 = 9/5 C + 32

C = (-40 - 32) × 5/9 = -40°C is the Celsius temperature of -40°F.

(ii) To convert -40°F to Kelvin, we first convert the Celsius temperature to Kelvin by adding 273.15.

K = C + 273.15

K = -40 + 273.15 = 233.15 K is the Kelvin temperature of -40°F.

c. 68°F, room temperature

(i) To convert 68°F to Celsius, we use the given formula.

F = 9/5 C + 32

68 = 9/5 C + 32

C = (68 - 32) × 5/9 = 20°C is the Celsius temperature of 68°F.

(ii) To convert 68°F to Kelvin, we first convert the Celsius temperature to Kelvin by adding 273.15.

K = C + 273.15

K = 20 + 273.15 = 293.15 K is the Kelvin temperature of 68°F.

d. 7 × 10⁷ °F, temperature required to initiate fusion reactions in the sun

(i) To convert 7 × 10⁷ °F to Celsius, we use the given formula.

F = 9/5 C + 32

7 × 10⁷ = 9/5 C + 32

C = (7 × 10⁷ - 32) × 5/9 = 3.85 × 10⁷ °C is the Celsius temperature of 7 × 10⁷ °F.

(ii) To convert 7 × 10⁷ °F to Kelvin, we first convert the Celsius temperature to Kelvin by adding 273.15.

K = C + 273.15

K = 3.85 × 10⁷ + 273.15 = 3.85 × 10⁷ K is the Kelvin temperature of 7 × 10⁷ °F.

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Answer:

6

Explanation:

If there are 6 electrons and it has a balanced charge, there also must be six protons.

The number of grams of potassium sulfate dissolved in 700 mL of a 0.5M is 60.991g.

The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass as follows:

mass = no of moles × molar mass

However, the number of moles can be calculated from the molarity as follows:

0.5M = moles ÷ 0.7L

moles of pottasium sulfate = 0.35 moles

Molar mass of pottasium sulfate = 174.259 g/mol

Mass = 174.26 × 0.35 = 60.991g

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The correct option for the given question is (a) generally a strong bond. A hydrogen bond is a relatively weak bond that occurs between a hydrogen atom of one molecule and an electronegative atom, such as nitrogen, oxygen, or fluorine, of another molecule. However, compared to other intermolecular forces, hydrogen bonds are relatively strong.

Other options are incorrect because:

(b) does not occur in living organisms - This is incorrect because hydrogen bonds play a crucial role in the structure and function of biological molecules, such as DNA and proteins.

(c) forms between atoms having the same electronegativity - This is incorrect because hydrogen bonds form between an electronegative atom and a hydrogen atom, which has a partial positive charge due to its low electronegativity.

(d) is a specialized type of covalent bond - This is incorrect because hydrogen bonds are not covalent bonds, but rather a type of intermolecular force.

(e) does not require electron transfer - This is correct. Hydrogen bonds do not involve the transfer of electrons, but rather the attraction between partially charged atoms.

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A confidence level of 95% would mean the rejection of the null hypothesis would occur if the calculated z-score is less than -1.96 or greater than 1.96.

The answer to this question is D. A hypothesis test regarding the difference between two population proportions from independent samples.

We can solve this by performing a hypothesis test on the difference between the population proportions of two independent samples.

For this case, the test is for difference of two population proportions of independent samples, and it will use a z-test with a 95% confidence interval.

The null and alternative hypothesis would be given as:H0: p1 - p2 = 0 Ha: p1 - p2 ≠ 0

The formula for calculating the test statistic is given as:z=\frac{\left(\widehat{p_{1}}-\widehat{p_{2}}\right)-D}{\sqrt{\widehat{p}(1-\widehat{p})\left(\frac{1}{n_{1}}+\frac{1}{n_{2}}\right)}}

where \widehat{p} = \frac{x_{1}+x_{2}}{n_{1}+n_{2}} is the pooled proportion under the null hypothesis, and D = 0 is the value under the null hypothesis.

A confidence level of 95% would mean the rejection of the null hypothesis would occur if the calculated z-score is less than -1.96 or greater than 1.96.

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The relation between amino acids and polypeptide is that amino acid is monomer and polypeptide is polymer.

A member of the class of organic molecules known as amino acids, each of which is made up of a special organic R group, an acidic carboxyl group (COOH), a basic amino group (NH2), and an amino group (NH2) (or side chain). Alpha-amino [alpha-amino] carboxylic acid is the colloquial term for an amino acid. Every molecule has a central carbon (C), also known as the -carbon, that is attached to an amino group and a carboxyl group. Typically, a hydrogen (H) atom and a R group are used to fill the final two bonds of the -carbon atom. Standard (or common) amino acids can be divided into groups according to the polarity (i.e., the distribution of electric charge) of the R group (e.g., side chain).

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The first step is to convert the volume from milliliters to liters. This is because the concentration is given in milligrams per liter, so we need to make sure that the volume is in liters as well.

. 100 mL = 0.1 L. Convert the concentration from milligrams per deciliter (mg/dL) to milligrams per liter (mg/L). 50 mg/dL = 50 mg/L. Multiply the volume by the concentration to get the mass of KH2PO4 in milligrams. 0.1 L * 50 mg/L = 5 mg

Divide the mass in milligrams by the molar mass of KH2PO4 (136.09 g/mol) to get the mass in grams. 5 mg / 136.09 g/mol = 0.0365 g

The first step is to convert the volume from milliliters to liters. This is because the concentration is given in milligrams per liter, so we need to make sure that the volume is in liters as well.

The second step is to convert the concentration from milligrams per deciliter to milligrams per liter. This is because a deciliter is equal to 0.1 liter, so we need to multiply the concentration by 10 to get the concentration in milligrams per liter.

The third step is to multiply the volume by the concentration to get the mass of KH2PO4 in milligrams. This is because the concentration tells us how many milligrams of KH2PO4 are in 1 liter of solution, and the volume tells us how many liters of solution we have.

The fourth step is to divide the mass in milligrams by the molar mass of KH2PO4 to get the mass in grams. This is because the molar mass tells us how many grams are in 1 mole of KH2PO4, and the mass in milligrams tells us how many milligrams of KH2PO4 we have.

Therefore, the mass of KH2PO4 required to yield 100 mL of a 50 mg/dL solution is 0.0365 g.

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Answer:

molar mass of N + 3 × molar mass of H

Explanation:

took the test and got it right

Molar mass is the proportion of the mass of the substance to the moles. The molar mass of ammonia is calculated as, the molar mass of N + 3 × molar mass of H. Thus, option c is accurate.

The molar mass of any substance is the mass in grams divided by the mole of the substance. It is given in g/mol. It is calculated as:

Molar mass = Mass ÷ Moles

In Ammonia there are one nitrogen and three hydrogen atoms, and hence the molar mass is given as,

Molar mass of N + 3 × Molar mass of H

Therefore, option c. molar mass of N + 3 × molar mass of H is correct.

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Answer:

D ) Chemical Change

Explanation:

Option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.

An ethogram can be best described as an inventory of the behavior of a particular species. It is a systematic catalog or list of behaviors exhibited by a specific animal species.

An ethogram provides a comprehensive overview of the behaviors displayed by the animals under study, documenting various activities, actions, and patterns of behavior.

While options 1 and 2 are related to visual representations or descriptions of behavior, they do not capture the comprehensive nature of an ethogram. Option 4 refers specifically to behaviors observed in response to an experimental intervention, which is more narrow in scope compared to an ethogram. Therefore, option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.

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Answer:

large particle composite

Answer:

if my calculation are correct, it's 295 grams

Explanation:

because liters converted to grams is .1=100 so if you take 2.95 times 100, it equals 295

Answer:

Measures Acidity and Basisity of a solution

Explanation:

It is measured on a scale of 1-14.

1-6 are acids. The lower the number, the more acidic it is.

7 is neutral

8-14 are bases. The higher the number, the more basic it is.

0.0000128 mole TiO2 in a jelly bean.Any chemical molecule, whether created chemically or naturally, that exclusively contains the elements titanium and oxygen is referred to as titanium oxide.

With the chemical formula TiO2, titanium dioxide, sometimes referred to as titanium(IV) oxide, is an inorganic substance. It is also known as titanium white, Pigment White 6 (PW6), or CI 77891 when used as a pigment.

Step 1: Given data

Number of moles of titanium (IV) oxide in 1 jelly bean (n):7. 69x10^( 18)

Step 2: Calculate the mass (in grams) corresponding to 7. 69x10^( 18) moles of TiO₂

To convert moles to mass, we need a conversion factor. In this case, it is the molar mass of TiO₂: 79.87 g/mol.

7. 69x10^( 18) mol TiO₂ × 79.87 g TiO₂/1 mol TiO₂

= 1.64*10^(20)g TiO₂

when mass is reversely converted to moles then the moles:0.0000128 mole TiO2.

Although mineral forms might seem black, it is a solid that is insoluble in water and is white in colour. It may be used as a pigment in a variety of products, such as paint, sunscreen, and food colouring. Its E number for usage as food colouring is E171.

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