if the half-life of hydrogen-3 is 11.8 y, after two half-lives the radioactivity of a sample will be reduced to one-half of the original amount.

Answer:

Explanation:

here you will use the POEM:

% to mass, mass to mole, divide by small, multiply til whole (if needed)

2) find the molecular formula by using the formula

n = molecular weight or molar mass of true compound/empirical weight x 100

Assume 100 g of Compound X to make % equal mass:

% to mass, then mass to mole, now divide by small

40.00 g C x 1 mole/12.01 gC =    3.33  mole C  /3.33 = 1

6.71 g H x 1mole/1.01 g H =         6.64   mole H /3.33 = 2

53.29g O x 1 mole/16.00 g O =   3.33   mole O /3.33 =1

because we end up with the whole numbers, we do not need to use the 4th step.

so the empirical formula is C1H2O1

now to figure out what the molecular formula is we use:
n = multiple = mw/ew = m

we need to find the empirical weight:
C1H2O1 = 1x12.01 + 2x1.01 + 1 x 16 = 30.03 g/mol

molecular formula = (empirical formula)n

n = 180.15/30.03 = 6

so the answer is (C1H2O2)6  = C6H12O6

The compound X has a molar mass of\(180.15 g.mol^-^1\) and consists of 40.00% carbon, 6.71% hydrogen, and 53.29% oxygen.

To determine the molecular formula of compound X, we need to find the empirical formula and then determine the factor by which the empirical formula should be multiplied to obtain the molecular formula.

First, we calculate the number of moles of each element present in 100g of compound X.

The mass of carbon in 100g of X is 40.00g, which corresponds to 40.00/12.01 ≈ 3.33 moles of carbon.

The mass of hydrogen in 100g of X is 6.71g, which corresponds to 6.71/1.01 ≈ 6.64 moles of hydrogen.

The mass of oxygen in 100g of X is 53.29g, which corresponds to 53.29/16.00 ≈ 3.33 moles of oxygen.

Next, we find the simplest whole-number ratio of the elements. Dividing the number of moles by the smallest number of moles (3.33 moles) gives us a ratio of approximately 1:2:1 for carbon, hydrogen, and oxygen, respectively.

Therefore, the empirical formula of compound X is \(CH_2O\).

Finally, to find the molecular formula, we need to determine the factor by which the empirical formula should be multiplied to obtain the molar mass of \(180.15 g.mol^-^1\). The molar mass of \(CH_2O\) is 12.01 + 1.01 * 2 + 16.00 = \(30.03 g.mol^-^1\).

Dividing the molar mass of the compound (\(180.15 g.mol^-^1\)) by the molar mass of the empirical formula (\(30.03 g.mol^-^1\)), we find that the factor is approximately 6.

Therefore, the molecular formula of compound X is \(C_6H_1_2O_6\).

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Buffer solution is obtained by hendersons hasselbalch equation.

Buffer solution is water based solution which consists of a mixture containing a weak acid and a conjugate base of the weak acid or a weak base and conjugate acid of a weak base.it is a mixture of weak acid and a base.

The pH of the buffer solution is determined by the expression of the henderson hasselbalch equation.

      pH=pKa +  log[(A-)/(HA)]

     Where, pKa =dissociation constant

                   A- = concentration of the conjugate base

                    [HA]= concentration of the acid

The buffer solution of ammonium chloride contains a weak base ammonia and a conjugate base ammonium.

 Here, a buffer solution contains 0.238 m of ammonia. The volume of the solution is 2.30l and the ph of the buffer solution is 9.02 .By putting all the values we will solve the expression.

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Answer:

0.80 mol

Explanation:

n(H)/n(N) = 1/3

n(N) = 3×0.60

n(N) = 1.8 mol

n(N) in excess = 1.80-0.60 = 1.20 mol

n(N)/n(NH3) = 3/2

n(NH3) = 2/3×1.20 = 0.80 mol

Answer:

So F=2N

Hope this helps.

Explanation:

P= F/A, where P is pressure, F is force, A is area.

So

P=F/A

0.5N/cm2 = F/4cm2 <--(do cross

2N=F multiplication,

4×0.5)

( And pls check on the unit of area u wrote, it should be (4cm2), not (4cm3) Unit of area is cm2.)

While visiting his uncle's farm, Derek learned that horses and donkeys are two different species. Based on this information, Derek can infer that horses and donkeys are members of different populations.


Since horses and donkeys are different species, they belong to different populations. A population refers to a group of individuals of the same species that live in the same area and can interbreed. While horses and donkeys can mate, their offspring, known as mules, are usually infertile.

This means that mules cannot produce offspring of their own, which indicates that horses and donkeys are not members of the same population. In contrast, if they were members of the same population, they would be able to produce fertile offspring. Therefore, Derek can infer that horses and donkeys are members of different populations.

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Ionic bonds are a type of bond formed with the attraction between oppositely charged ions to form a chemical compound, this type of bond will have a transfer of electrons, from the positively charged ion (cation) to the negatively charged ion (anion). Since this type of bonding heavily depend on the electronegativity of the elements, we will have compounds formed with metals, located more to the left in the periodic table, mostly group 1 and 2, and with nonmetals, more to the right in the periodic table, one example of this type of bond is Chlorine (nonmetal anion) and Lithium (metal cation).

Covalent bonds are a type of bond formed with the sharing of electrons between two elements with no big difference in their electronegativity, usually, we will see nonmetals in this type of bond, since their difference in electronegativity is not as relevant as the difference between metals and nonmetals, one example of this type of chemical bond is Nitrogen and Oxygen, 2 nonmetals that can bond together.

Metallic bond, as the name suggest, is a type of bond that will strictly involve metals and not nonmetals, this type of bond has many properties but the low electronegativity in general is one of these properties, one example for this bond is Gold and Gold

Therefore the answers are:

Gold and Gold = metallic

Nitrogen and Oxygen = covalent

Chlorine and Lithium = ionic

Answer: Yes we can extract all the lithium from the amount of compound we have.

Explanation:

To calculate the moles :

\(moles=\frac{\text {given mass}}{\text {Molar mass}}\)

\(\text{Moles of} Li=\frac{150g}{7g/mol}=21.4moles\)

\(\text{Moles of} Li_2O=\frac{675g}{30g/mol}=22.5moles\)

\(2Li_2O\rightarrow 4Li+O_2\)

According to stoichiometry :

2 moles of \(Li_2O\) produce 4 moles of \(Li\)

Thus 22.5 moles of \(Li_2O\) will produce=\(\frac{4}{2}\times 22.5=45moles\)  of Li

As 21.4 moles is a lesser quantity than 45 moles, thus it can be produced

Yes, you can extract all the lithium you need from the compound

We'll begin by calculating the mass of lithium, Li in 1 mole of Li₂O. This can be obtained as described below:

1 mole of Li₂O = (2×7) + 16

1 mole of Li₂O = 14 + 16 = 30 g

SUMMARY

30 g of Li₂O contains 14 g of Li.

30 g of Li₂O contains 14 g of Li.

Therefore,

675 g of Li₂O Will contain = (675 × 14)/30 = 315 g of Li.

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The majority of the energy required for life on Earth is produced and maintained by photosynthesis, which is also substantially responsible for producing and maintaining the oxygen content of the atmosphere. 

6CO₂ + 6H₂O = 6O₂ + C₆H₁₂O₆

6 moles of water are required for 1 mole of glucose.

Therefore, 0.9 x 6 = 5.4 moles of water are needed for every mole of glucose.

5.4 x 18 = 97.2 g

Plants and other living things employ a process called photosynthesis to transform light energy into chemical energy that can then be released through cellular respiration to power the organism's activities. Carbohydrate molecules like sugars and starches, which are created from carbon dioxide and water, contain some of this chemical energy.

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Answer:

There are 198 grams of iron in a 450-gram sample of the ore.

Explanation:

From the given information:

Given that:

100-gram sample of iron ore is found in 44g of iron.

Thus. the grams of iron that can be found in a 450-gram sample of the iron ore can be computed as follows:

100g of iron ore = 44g of iron

450 gram of iron ore = x g of iron

x(g) of iron = ( 44g of iron × 450 gram of iron ore) / 100g of iron ore

x(g) of iron =  198 grams of iron

Thus, there are 198 grams of iron in a 450-gram sample of the ore.

I will help you

Let's say we change the volume of a gas under isothermal conditions, and we want to find the resulting pressure. Then, the equation of Boyle's law states that: p₂ = p₁ × V₁ / V₂ or p₂ / p₁ = V₁ / V₂. As we can see, the ratio of the final and initial pressure is the inverse of the ratio for volumes.

Dimensional analysis can only be used for time, distance, mass, speed, volume, and chemical quantities: False.

A dimensional analysis can be defined as an analysis of the relationships that exist between different physical quantities by identifying their fundamental (base) quantities, especially for the purpose of inferences.

Dimensional analysis is also referred to as unit-factor method or factor-label method and it is typically used to convert a different type of unit to another.

Generally, dimensional analysis can only be used for the following physical quantities:

In conclusion, a dimensional analysis cannot be used for chemical quantities such as a mole i.e it has no dimensional formula.

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The amount of heat given off by lead is Q = - 1776.5J

Given,

Mass of the lead = 85g

Decreased temperature = 200 ⁰c to 10 ⁰c

Specific heat capacity of lead= 0. 11 j/g ⁰c

where T1=200degrees Celsius and T2=10 degree Celsius.

Q=MCΔT

ΔT=T2-T1

ΔT=10-200 = -190°C

Q = Change in energy

M = mass of a substance

C= Specific heat capacity

Q = (85g) * (0.11J/g °c) * (-190°C)= -1776.5J

Q=-1776.5J

Specific heat capacity:

A material's specific heat capacity, also known as massive heat capacity, is determined using thermodynamics as the specific heat of an unit of the compound scaled by the the sample's mass.

The specific heat capacity of a substance is defined as the number of heat (J) received per unit of mass (kg) when its temperature increases 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

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Based on the given information, the most likely identity of your unknown compound is  option D. 2-heptanone.

The boiling range of 145-148 °C corresponds well with the boiling point of 2-heptanone, which is approximately 147 °C. Additionally, the presence of a carbonyl peak at 1717 cm⁻¹ in the IR spectrum is indicative of a ketone functional group, which is present in 2-heptanone.

The other options can be ruled out based on their boiling points and functional groups:

A. Mesityl oxide has a boiling point of around 132 °C and contains both carbonyl and alkene groups, not matching the given boiling range or the single carbonyl peak.
B. Methyl trichloroacetate has a boiling point of approximately 171 °C and contains an ester functional group, which typically shows a carbonyl peak around 1735-1750 cm⁻¹, not matching the given boiling range or carbonyl peak.
C. Ethyl butanoate has a boiling point of about 99 °C and also contains an ester functional group, again not matching the given boiling range or carbonyl peak.

Thus, 2-heptanone (D) is the most likely identity of your unknown compound due to its matching boiling range and  the presence of a ketone functional group. Therefore the correct option  D

The Question was Incomplete, Find the full content below :

Your team is assigned the Musky Mix. Your unknown has a boiling range of 145-148 oC. You take an IR of your compound and see a carbonyl peak at 1717 cm-1. What is the most likely identity of your unknown? A. mesityl oxide B. methyl trichloroacetate C. ethyl butanoate D. 2-heptanone

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Answer:

As you can see sodium = ionic and covalent bonds aka NA 2

and CO 3 also has those two bonds the other answers dont have both numbers (bonds) Na2 and CO3 is the only answer choice that has these bonds in simpler terms ( only answer with 2 numbers)

Explanation:

A block of lead has dimensions of 4.50 cm by 5.20 cm by 6.00 cm, the density of lead  is mathematically given as

x= 11.30 g/cm^3

This is further explained below.

Generally, in order to determine the lead's specific gravity; To begin, we would use the formula to find out how much space the block of lead takes up;

Volume= length  * width  *  height

After plugging the values into the formula, we get the following:

Volume = 4.50 * 5.20 * 6.00

Volume = 140.4 cm^3

The next thing that we do is determine the density of lead;

After plugging the values into the formula, we get the following:

X = 11.30 g/cm^3

In conclusion, the density of lead is 11.30 g/cm^3

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CQ

A block of lead has dimensions of 4.50 cm by 5.20 cm by 6.00 cm. The block weighs 1587 g. From this information, calculate the density of lead.

8. One pair.

because nitrogen has 5 valence electrons, and fluorine has 7, but if there's 3 fluorine atoms, nitrogen shares 1 to each F atom to get it to 8, meaning nitrogen will have a single pair left over since there's no more F atoms to share them with.

Answer:

B

Explanation:

trust me im 100% correct

Answer:

The color of light in which plants are less likely to produce food is green.

Explanation:

Photosynthesis is the process by which plants take advantage of sunlight to convert it into chemical energy, necessary to manufacture their nutrients, their growth and development.

Plants do not absorb all the colors of the light spectrum, since due to their pigments they absorb colors with specific wavelengths. Green plants do not absorb the color green, but reflect it —due to the chlorophyll pigment— which gives the green color to those leaves.

For this reason, the light that plants take least advantage of to produce food is green light.

Other options:

    The colors blue, orange and red can be absorbed by the plant, to a lesser or greater degree.

Answer:

it would be green

Explanation:

The balanced chemical equation for the reaction between N2 and F2 to produce NF3 is N2(g) + 3F2(g) → 2NF3(g). The molar mass of N2 is 28.02 g/mol. Therefore, 26 g of N2 is equal to 0.93 moles of N2.

The preceding balanced equation clearly shows that 2 moles of ammonia are created for every 1 mole of nitrogen. This indicates that the reaction's N2 to NH3 mole ratio is 1 to 2.

There are 14 moles of NH3 produced. The balanced chemical equation must first be written. Then use the unitary approach to fix the issue. Now, the mass of ammonia is determined using the following formula.

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Polypeptides : Peptides are tiny chains of amino acids connected by the peptide bonds.

Function of polypeptides : Polypeptides aid make up proteins by bonding many amino acids conjointly.

Amino acids are organic components that comprises both amino and carboxylic acid functional groups.

Sequence of amino acids are known as polypeptides. The covalent bonds that hold on to amino acids conjointly are known as peptide bonds.

Types of amino acids : nonpolar, polar, negatively charged, and positively charged.

According to question

Linking amino acid monomers together to form a polymer requires the formation of peptide bonds.

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Answer:

Solvent is 1.00 liter of water.

Answer:

It would be the water i think rlly srry if im wrong thats just what i got

Explanation:

because a solvent would be the one dissolving

Part A: The balanced molecular equation for the reaction between nitric acid (HNO3) and calcium hydroxide (Ca(OH)2) is 2 HNO3(aq) + Ca(OH)2(aq) → Ca(NO3)2(aq) + 2 H2O(l).

Part B: The net ionic equation for the reaction between nitric acid and calcium hydroxide is 2 H+(aq) + 2 OH-(aq) → 2 H2O(l).

Part A:

To write the balanced molecular equation, we first need to identify the formulas of the reactants and products. Nitric acid is represented by HNO3, and calcium hydroxide is represented by Ca(OH)2.

The balanced molecular equation is obtained by ensuring that the number of atoms of each element is the same on both sides of the equation. In this case, we have 2 hydrogen (H) atoms, 1 nitrogen (N) atom, 3 oxygen (O) atoms, 1 calcium (Ca) atom, and 2 hydroxide (OH) ions.

2 HNO3(aq) + Ca(OH)2(aq) → Ca(NO3)2(aq) + 2 H2O(l)

Part B:

The net ionic equation represents the reaction without including the spectator ions. In this case, the spectator ions are the calcium (Ca2+) and nitrate (NO3-) ions.

When nitric acid and calcium hydroxide react, the hydrogen ions (H+) from nitric acid combine with the hydroxide ions (OH-) from calcium hydroxide to form water molecules.

The net ionic equation for the reaction is:

2 H+(aq) + 2 OH-(aq) → 2 H2O(l)

The net ionic equation focuses on the species directly involved in the reaction, omitting the spectator ions that do not participate in the chemical changes.

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Answer:

1. B

2. 100 C

3.  C

4. D

5. D

Explanation:

Answer:

22.95g

Explanation:

Given parameters:

Percentage by mass of silver in silver iodide  = 45.9%

Mass of silver iodide given  = 50g

Unknown:

Mass of silver in silver iodide  = ?

Solution:

The formula of the compound is;

 Silver iodide  = AgI

       Since the percentage by mass of silver in the compound is 45.9%;

 Mass of silver  = percentage by mass of silver x mass of AgI

 Mass of silver  = \(\frac{45.9}{100}\) x 50  = 22.95g

The percent by mass of carbon in HC₂H₂O₂ is approximately 39.97%.

To determine the percent by mass of carbon in HC₂H₂O₂ (acetic acid), we need to calculate the mass of carbon relative to the total molar mass of the compound.

The molar mass of acetic acid (HC₂H₂O₂) can be calculated by summing the molar masses of its individual elements:

Molar mass (HC₂H₂O₂) = 1 × molar mass (H) + 2 × molar mass (C) + 2 × molar mass (H) + 2 × molar mass (O)

Molar mass (HC₂H₂O₂) = 1 × 1.00794 g/mol + 2 × 12.0107 g/mol + 2 × 1.00794 g/mol + 2 × 15.999 g/mol

Molar mass (HC₂H₂O₂) ≈ 60.052 g/mol

The molar mass of carbon in acetic acid is 2 × 12.0107 g/mol, which is the contribution of the two carbon atoms in the compound.

Now, we can calculate the percent by mass of carbon in acetic acid using the following equation:

Percent by mass = (Mass of carbon / Total mass of HC₂H₂O₂) × 100%

Percent by mass = (2 × 12.0107 g/mol / 60.052 g/mol) × 100%

Percent by mass ≈ 39.97%

Therefore, the percent by mass of carbon in HC₂H₂O₂ is approximately 39.97%.

It is important to note that the calculation assumes the molecular formula of HC₂H₂O₂ represents one molecule of acetic acid. In a given sample, there could be multiple molecules of acetic acid present, and the percent by mass of carbon would remain the same.

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Reactions are considered energetically favorable when the bond energy obtained from the formation of products is greater than the energy required to break the bonds in reactants.

We know that the bond energy has to do with the energy of the reactants and the products in a reaction. It has to do with the energy that can be given out or even taken in in a chemical reaction.

We know that the bond energy would depend on the bond energy of the reactants and the products. We know that the bond that is contained in the reactants is broken just as the bonds that are contained in the products are being formed.

Thus we say that a reaction is favorable when more energy is obtained than the energy that we need to break the bond.

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Answer:

released, consumed

Explanation:

Got this one right on the test.

The empirical formula is the simplest formula for a compound which is defined as the ratio of subscripts of smallest possible whole number of the elements present in the formula. It is also known as the simplest formula.

write a balanced equation for the reaction between tantalum pentachloride and water?

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