the tosylate of a primary alcohol normally undergoes an sn2 reaction with hydroxide ion to give a primary alcohol. reaction of this tosylate, however, gives a compound of molecular formula . c9h16o

Answer:

36 atoms

Explanation:

The equation for the reaction is given below:

C6H12O6 + 6O2 —> 6CO2 + 6H2O

From the reaction above, the reactants include:

C6H12O6 and 6O2.

Thus, the total atom present in the reactants can be obtained as follow:

Element >>>>>>>> Atom present

Carbon (C) >>>>>> 6

Hydrogen (H) >>>> 12

Oxygen (O) >>>>>> 18

TOTAL >>>>>>>>>> 36

From the above illustration, 36 atoms are represented in the reactants.

The mass number of the daughter atom formed from the alpha decay of a certain radioactive atom that has 90 protons and 142 neutrons is 228.

Alpha decay of a radioactive material is the release of an alpha particle that posseses mass number of 4 and atomic number of 2.

According to this question, a certain radioactive atom that has 90 protons and 142 neutron undergoes alpha decay. This means that the mass number of the daughter atom will be as follows:

Mass number of radioactive atom = 142 + 90 = 232

Mass number of daughter atom = 232 - 4 = 228

Therefore, the mass number of the daughter atom formed from the alpha decay of a certain radioactive atom that has 90 protons and 142 neutrons is 228.

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Answer: 0.0054 s

Explanation: There is an inverse relation between the frequency  and the period  of a wave (a sound wave in this case):

T=1/F

Where f = 1.85 (10)² H z

Hence : T = 1/1.85 (10)² H z T =0.0054s

The height of the object : 600 mm

Given

d object=360 mm(object distance)

d image=90 mm(image distance)

Required

h object

Solution

focal length = f :

\(\tt \dfrac{1}{f}=\dfrac{1}{d_o}+\dfrac{1}{d_i}\\\\\dfrac{1}{f}=\dfrac{1}{360}+\dfrac{1}{90}\rightarrow f=72~mm\)

The magnification :

\(\tt M=\dfrac{d_i}{d_o}=\dfrac{90}{360}=0.25\)

\(\tt M=\dfrac{h_i}{h_o}\\\\0.25=\dfrac{150}{h_o}\rightarrow h_o=600~mm\)

Answer:

Mass = 19.0 g

Explanation:

Given data:

Mass of limestone react = ?

Mass of lime produced = 11.2 g

Solution:

Balanced chemical equation:

CaCO₃     →      CaO + CO₂

Number of moles of lime:

Number of moles = mass / molar mass

Molar mass of lime 56.1 g/mol

Number of moles = 11.2 g/ 56.1 g/mol

Number of moles = 0.19 mol

Now we will compare the moles of CaO and CaCO₃

                     CaO        :           CaCO₃

                       1             :             1

                     0.19          :          0.19

Mass of limestone react:

Mass = number of moles × molar mass

Mass = 0.19 mol × 100.1 g/mol

Mass = 19.0 g

Answer:497J/kg/K

Explanation:

Use the equation: Q=mS◇T

According to specific heat capacity, the specific heat of glass is 0.4970 J/gK.

Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.

It is given by the formula ,

Q=mcΔT

Substituting values in above equation, c=Q/mΔT, C=840/65×26=0.4970 J/gK.

Thus, the specific heat of glass is 0.4970 J/gK.

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The correct answer is that the acid dissociation constant (Ka) for lactic acid is \(1.59 × 10^(-3)\) (to two significant figures).

Lactic acid is a weak acid that dissociates in water to produce hydrogen ions (H+) and lactate ions \((CH3CH(OH)COO-)\). The dissociation of lactic acid can be represented by the following equation: \(CH3CH(OH)COOH ⇌ H+ + CH3CH(OH)COO-\) . The equilibrium constant for this reaction is called the acid dissociation constant (Ka), which is defined as the ratio of the concentrations of the products (H+ and \(CH3CH(OH)COO-)\) to the concentration of the reactant (lactic acid).

\(Ka = [H+][CH3CH(OH)COO-]/[CH3CH(OH)COOH]\). The pH of a solution is defined as the negative logarithm (base 10) of the hydrogen ion concentration \((pH = -log[H+])\). Therefore, the concentration of hydrogen ions in a \(0.10 mM\) solution of lactic acid with a pH of 2.44 can be calculated as follows: \([H+] = 10^(-pH) = 10^(-2.44) = 3.98 × 10^(-3) M\)

Using the equilibrium equation and the hydrogen ion concentration, the acid dissociation constant (Ka) for lactic acid can be calculated as:

\(Ka = [H+][CH3CH(OH)COO-]/[CH3CH(OH)COOH] = (3.98 × 10^(-3))^2 / (0.10 × 10^(-3)) = 1.59 × 10^(-3)\)Therefore, the acid dissociation constant (Ka) for lactic acid is\(1.59 × 10^(-3)\) (to two significant figures).

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Answer:

A. Temperature and pressure

Explanation:

The factors included in a phase diagram are the temperature and pressure conditions.

A phase diagram is a combined plot of three curves all in equilibrium;

Solid- liquid, liquid -gas, and solid -gas plots

The factors included on a phase diagram are temperature and pressure and the correct option is option A.

A phase diagram is a graphical representation that shows the different phases of a substance (solid, liquid, and gas) as a function of temperature and pressure. It provides valuable information about the conditions at which different phases can exist and the boundaries between them.

The temperature is typically plotted on the horizontal axis, while the pressure is plotted on the vertical axis.

By examining a phase diagram, one can determine the melting point, boiling point, and critical point of a substance, as well as the regions of stability for each phase. Additionally, phase diagrams can reveal the existence of phase transitions such as melting, boiling, and sublimation.

Thus, the ideal selection is option A.

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Reference table F lists the solubility of various compounds in water at 25°C. According to the table, the solubility of silver iodide in water is 1.5 x 10⁻³ grams per 100 grams of water.

This means that at 25°C, 1.5 x 10⁻³ grams of silver iodide will dissolve in 100 grams of water.

Silver iodide is a sparingly soluble compound, which means that it has low solubility in water. This is due to the ionic nature of silver iodide, which results in strong attractive forces between the ions in the solid form.

As a result, only a small amount of silver iodide can dissolve in water, even at high temperatures. This low solubility has important implications for the use of silver iodide in various applications, including photography and cloud seeding.

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Answer:  Mass is 2,37 kg

Explanation: Weight G = mg, and g = 9.81 m/s² on Earth.

m = W/g = 23.2 N /  9.81 m/s²

Answer:

MgF₂

Explanation:

Fluorine only has a 1- charge, so to satisfy the 2+ charge on magnesium–– you need 2 fluorine atoms to balance out the charges.

The initial moles of the HI introduced is 6.2 moles.

We know that the equilibrium constant can only be obtained from the concentration of the substance at the point of equilibrium. We would have to set up the ICE table as shown below;

            2HI ⇆  \(H_{2}\)    +   \(I_{2}\)

I            a           0          0

C         - x           + x       + x

E         a - x        1.8        1.8

We can see that in this case; x = 1.8 and the equilibrium constant = 1/6 = 0.17

K = [ \(H_{2}\)  ] [ \(I_{2}\)]/[HI]^2

0.17 = (1.8)^2/ (a - 1.8)^2

0.17 = 3.24/(a - 1.8)^2

0.17a^2  - 0.61a + 0.55 = 3.24

0.17a^2  - 0.61a - 2.69 = 0

a=6.2 M

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Alcohols are formed via anti-Markovnikov addition of water to alkenes, with the hydroxyl group attaching to the less substituted carbon.

The hydroboration oxidation sequence is a method for the formation of alcohols, and the resulting alcohol is always formed with anti-Markovnikov selectivity, meaning that the hydrogen atom is added to the less substituted carbon atom and the boron atom is added to the more substituted carbon atom.

This reaction sequence is typically carried out using borane as the hydroborating agent and hydrogen peroxide or sodium peroxide as the oxidizing agent. Overall, the hydroboration oxidation sequence is an efficient and selective method for the preparation of alcohols.
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The balanced net-ionic equation for the sulfide ions (S2-) oxidizing to elemental sulfur (S8) in the presence of permanganate (MnO4-) under acidic conditions is:

2 MnO4-(aq) + 8 S2-(aq) + 16 H+(aq) → S8(s) + 2 Mn2+(aq) + 8 H2O(l)

To balance the equation, we start by balancing the atoms other than hydrogen and oxygen. In this case, we have 2 manganese (Mn) atoms on the product side, so we place a coefficient of 2 in front of MnO4-. Now, there are 8 oxygen (O) atoms on the reactant side, so we need 8 H2O molecules as products to balance the oxygens. Next, we balance the hydrogen (H) atoms by adding 16 H+ ions on the reactant side.

After balancing the atoms other than hydrogen and oxygen, we check the charge on both sides. We have a total charge of -8 on the reactant side due to the 8 sulfide (S2-) ions, and a total charge of +4 on the product side due to the 2 manganese (Mn2+) ions. To balance the charges, we add 8 electrons (e-) on the reactant side.

The final balanced equation for the sulfite test is:

2 MnO4-(aq) + 8 S2-(aq) + 16 H+(aq) → S8(s) + 2 Mn2+(aq) + 8 H2O(l) + 8 e-

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Explanation:

Copper does not react with HCl to give H2 gas.

Antimony is an element having atomic number 51 and mass number 121.76 u. It has 51 number of proton and electrons.

Phosphorus is an element having the atomic number 15. It has 15 protons, electrons, and 16 neutrons.

The symbol of magnesium is Mg whereas the symbol of cobalt in Co.

The two subatomic particles present in the nucleus are the proton and neutron. They are collectively called nucleons. The proton has a positive charge, the electron has a negative charge whereas the neutron has no charge.

Protons and neutrons are accordingly called nucleons since they are in the nucleus of the atom. electrons are a type of subatomic speck with a negative charge. Protons are a type of subatomic particle with a positive charge.

Neutrons, further with protons, are subatomic particles found inside the nucleus of every atom. Neutrons have an impartial electric charge (neither negative nor positive) and have rather more mass than positively charged protons.

So we can conclude that Unlike protons and neutrons, which are detected inside the nucleus at the center of the atom, electrons are initiated outside the nucleus.

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The Percentage by mass of the ethylene glycol in the solution is 59.4%. Option C

To determine the mass percent of ethylene glycol in the solution, we need to use the concept of freezing point depression.

Freezing point depression is a colligative property that depends on the concentration of solute particles in a solution.

We know that;

ΔT = 0 - (-17.8)

= 17.8 °C

ΔT =  K m i

17.8 = 1.858 * m * 1

m = 9.58 m

Assuming that we have 1 Kg of solution;

9.58 = x/62 * 1/1

x = 594 g

The mass percent of the ethylene glycol = 594/1000 * 100/1

= 59.4%

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Answer:

C)peer review

Explanation:

Peer review involves the evaluation of scientific research work by other professionals working in the same field. It is one of the stages a manuscript passes through before it is published in any reputable journal.

Peer review is important because it ensures that only high quality and original scientific research is published for the consumption of other professionals in the same field.

Explanation:

density can be changed by changing either the pressure or the temperature. Increasing the pressure always increases the density of a material. Increasing the temperature generally decreases the density, but there are notable exceptions to this generalization.

Answer:

61 degrees

Explanation:

The reaction between an alcohol and chromic acid (H2CrO4) involves the oxidation of the alcohol to a carbonyl compound. During this reaction, the chromium in chromic acid is reduced from a +6 oxidation state to a +3 oxidation state.

Protonation: The chromic acid donates a proton to the alcohol, forming a chromate ester and water. This step generates a good leaving group, i.e. the water molecule. R-OH + H2CrO4 → R-O-CrO3 + H2O. Nucleophilic attack: The oxygen atom in the chromate ester acts as a nucleophile, attacking the electrophilic carbon atom in the carbonyl group. The result is the formation of a tetrahedral intermediate. R-O-CrO3 + H2O → R-O-Cr(OH)3. Elimination: The tetrahedral intermediate undergoes elimination of a water molecule, leading to the formation of the carbonyl compound and the regeneration of the chromic acid. R-O-Cr(OH)3 → R=O + Cr(OH)3

A reactant known as a nucleophile provides an electron pair in order to create a covalent bond. Typically, a nucleophile has a negative charge or is neutral with one or two donateable electrons. Such examples include H2O, -OMe, or -OtBu. The species with a lot of electrons is a nucleophile overall.

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The mass percent of the solution is approximately 10.51%.

To calculate the mass percent of the solution, we need to determine the total mass of the solution.

The mass of the solution can be calculated using the density and volume of the solution:

Mass of the solution = Density × Volume

Mass of the solution = 1.06 g/ml × 895 ml

Mass of the solution = 948.7 g

The mass percent of the solution can be calculated by dividing the mass of the solute (CSI) by the mass of the solution and multiplying by 100:

Mass percent = (Mass of CSI / Mass of the solution) × 100

Mass percent = (99.7 g / 948.7 g) × 100

Mass percent ≈ 10.51%

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Based on the balanced equation, if we have 0.08 moles of Iron (Fe), we can conclude that 0.08 moles of Hydrogen (H₂) will be formed as well.

First we need to balance the chemical equation for the reaction involving Iron (Fe) and Hydrogen (H).

The reaction will be between Fe and HCl (hydrochloric acid) to produce hydrogen gas (H₂) and iron chloride (FeCl₂):

Fe + 2HCl → FeCl₂ + H₂

From the balanced equation, we can see that for every 1 mole of Fe reacted, 1 mole of H₂ is formed. Therefore, if we have 0.08 moles of Fe, we can conclude that 0.08 moles of H₂ will be formed as well.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question we have

\(density = \frac{15}{14} \\ =1.0714285 ...\)

We have the final answer as

Hope this helps you

The descriptions and scientific names of both animals, it can be concluded that the physical lynx and bobcat are not the same species as they have different scientific names - Lynx canadensis and Lynx rufus.

The differences in their physical characteristics, such as the pattern and visibility of their tail and ear tufts, further support the idea that they are different species. However, they are in the same genus, which is Lynx. Therefore, option C is the correct answer. It is important to note that even though they are different species, they share similar characteristics and are often confused with each other. Both the lynx and bobcat are medium-sized wild cats that are native to North America and are known for their elusive nature and hunting abilities.

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Answer:

94.16g of N2O

50.88g of O2

Explanation:

O2 reacts with N2 as follows:

2N2 + O2 → 2N2O

To find moles of N2O produced we need to convert the mass of each gas to moles to find limiting reactant and the moles of N2O that could be produced:

Moles N2 (Molar mass: 28g/mol):

60g N2 * (1mol / 28g) = 2.14 moles N2

Moles O2 (Molar mass: 32g/mol):

85g O2 * (1mol / 32g) = 2.66 moles O2

For a complete reaction of 2.14 moles of N2 are needed:

2.14 mol N2 * (1mol O2 / 2 mol N2) = 1.07 moles of O2.

As there are 2.66 moles of O2, reactant in excess is O2 and will remain:

2.66 moles - 1.07 moles =

1.59 moles O2. The mass is:

1.59 moles O2 * (32g / mol) =

And there are produced:

2.14 mol N2 * (2 moles N2O / 2 moles N2) = 2.14 moles N2O.

The mass is (44g/mol for N2O):

2.14 moles N2O * (44g/mol) =

The new freezing point of the solution is -0.01597 °C and the new boiling point is 100.004 °C.

To determine the new freezing and boiling point of the solution, we need to use the equation:

ΔTf = Kf × m

ΔTb = Kb × m

Where:

ΔTf = the change in freezing point

ΔTb = the change in boiling point

Kf = the freezing point depression constant for the solvent = 1.86 °C/m

Kb = the boiling point elevation constant for the solvent = 0.512 °C/m

m = molality of the solution = moles of solute per kilogram of solvent

First, we need to calculate the molality of the solution:

58.5 g of H₂S is the solute, and it has a molar mass of 34.08 g/mol. Therefore, the number of moles of H₂S is:

moles of H₂S = 58.5 g / 34.08 g/mol = 1.717 mol

The mass of water is given as 200 kg, which is equivalent to 200,000 grams.

molality = moles of solute/kilograms of solvent

molality = 1.717 mol / 200 kg = 0.008585 mol/kg

Now, we can calculate the change in freezing point and boiling point:

ΔTf = Kf × m = 1.86 °C/m × 0.008585 mol/kg = 0.01597 °C

ΔTb = Kb × m = 0.512 °C/m × 0.008585 mol/kg = 0.004393 °C

To find the new freezing point, we need to subtract the change in freezing point from the freezing point of pure water (0°C):

New freezing point = 0°C - ΔTf = 0°C - 0.01597 °C = -0.01597 °C

To find the new boiling point, we need to add the change in boiling point to the boiling point of pure water (100°C):

New boiling point = 100°C + ΔTb = 100°C + 0.004393 °C = 100.004 °C

Therefore, the new freezing point of the solution is -0.01597 °C and the new boiling point is 100.004 °C.

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The mass (in grams) of sodium sulfide, Na₂S, needed to react completely with 0.12 g aluminum fluoride, AlF₃ is 0.17 g

The mass of sodium sulfide, Na₂S, needed can be obtain as illustrated below:

Balanced equation:

2AlF₃ + 3Na₂S -> Al₂S₃ + 6NaF

From the balanced equation above,

168 g of AlF₃ reacted with 234 g of Na₂S

Therefore,

0.12 g of AlF₃ will react with = (0.12 × 234) / 168 = 0.17 g of Na₂S

Thus, we can conclude from the the above calculation that the mass of  sodium sulfide, Na₂S needed is 0.17 g

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