What is a stem cell?

Answer:

2-bromopentane

Explanation:

In this case, we have a substitution. An Sn2 reaction. With this in mind, we have to identify the leaving group in this case "OH" from the 2-pentanol. The nucleophile is a "Br" atom provided by the PBr3. So, the "OH" would be replaced by "Br". If we have an Sn2 reaction we will have an inversion in the configuration. If we start with a wedge bond for "OH" we will have a dashed bond for "Br", if we have a dashed bond for "OH" we will have a wedge bond for "Br". In the 2-pentanol we have any special configuration because we don't have a chiral carbon, so we can have both options (wedge and dashed) for the product (See figure 1).

Percent of gold and copper are 88.2 and 11.8

Red gold is a gold-copper alloy used to make jewelry .

Let the mass  of gold be m1

Let the mass of copper be m2

We are given that m1+m2 =8.97 g

We know that volume is the ratio of mass to density

Thus

m1/d1  + m2/d2 = 0.528 cm3

where d1 and d2 is the density of gold and copper

m1/19.3 + m2/8.96 = 0.528

8.96m1 +19.3 m2 = 0.528 x 19.3 x 8.96 = 91.305

putting m1 = 8.97 - m2

8.96 ( 8.97 - m2 ) + 19.3 m2 = 91.305

80.3712 - 8.96m2 + 19.3 m2 =91.305

10.34 m2 = 91.305-80.3712

m2 = 10.9338 /10.34

      =1.0537gm

m1=8.97-1.0537

    =7.91gm

Therefore, percent of gold = 7.91/8.97 x 100 =88.20%

                 percent of copper = 100-88.2=11.8%

Therefore, percent of gold and copper are 88.2 and 11.8

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Answer:

Earth

Explanation:

Answer:

Earth

Explanation:

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Answer:

2.58g

Explanation:

First calculate the moles of butane used in the reaction

moles = mass÷molar mass

= 0.85÷58

= 0.0147

According to the stoichiometric ratio:

C4H10 : CO2 = 2:8

moles of CO2 =(8÷2)×0.0147

=0.0586 moles

mass of CO2 = 0.0586×44

= 2.58g

2.58g is the mass of carbon dioxide produced when 0.85 grams of butane (\(C_4H_{10}\)) reacts with oxygen according to the following balanced chemical equation:  \(2C_4H_{10} + 13O_2 - > 8CO_2 (g) + 10H_2O (g)\)

The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is “mol”.

Firstly calculate the moles of butane used in the reaction

moles = \(\frac{mass}{molar \;mass}\)

= \(\frac{0.85}{58}\)

= 0.0147

According to the stoichiometric ratio:

\(C_4H_{10}\) : \(CO_2\) = 2:8

moles of \(CO_2\) = (\(\frac{8}{2}\)) × 0.0147

=0.0586 moles

mass of \(CO_2\) = 0.0586×44

= 2.58g

Hence, option A is correct.

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Answer:

A. on the reactant side

Explanation:

A catalyst will appear in the steps of a reaction mechanism, but it will not appear in the overall chemical reaction

We need the chemical equation first

\(\\ \tt\bull\rightarrowtail {Na\atop Sodium}+{O_2\atop Oxygen}\longrightarrow {Na_2O\atop Sodium\: oxide}\)

The ratio is 1:2

The maximum mass of ammonia that can be produced from a mixture of 330.0 g of N2 and 420.0 g of H2 is 400.7g. Hydrogen is left unreacted. The mass of the Hydrogen would remain unreacted is 349.3g.

A chemical reaction's limiting reagent is the one that will totally consume all of the reactants. The reaction cannot continue if that reactant is no longer present. It prevents the reaction from intensifying as a result.

The reactant with surplus reagent is the one that would have continued to react if the other had not been used up.

The limiting reactant is the one that is consumed first and establishes a maximum limit on the quantity of product(s) that can be produced.

Calculate the amount of each reactant present and compare it to the amount of each reactant in the balanced chemical equation to determine the limiting reactant.

1) Moles of N2=330/28=11.79

moles of H2=420/2=210

moles of NH3 formed=2*11.79=23.57moles = 400.7g

2) Hydrogen is left unreacted.

3) hydrogen left=210-11.79*3=174.64moles = 349.3g

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Answer:

sorry to do this but I really needed some points to ask my question from someone else so that's why I am doing so really sorry and thank you for free points

The number of atoms of any element in the given chemical formula is the number that is written on the foot of the symbol of that element. Therefore, the correct option is option C.

Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.

Atom consists of electron, proton and neutron. The total mass of atom is inside the nucleus. Inside the nucleus proton and neutron is there. So calculate mass of an atom, total mass of all protons is added to the total mass of neutron. Electrons revolve around the nucleus.

If an electron of hydrogen gets excited and drops from energy level 2 to level 1 to release  least energy. The level shows the energy levels.

Therefore, the correct option is option C.

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Answer:

Iron‑56 is the most abundant isotope, so the atomic mass of iron is most similar to the mass of iron‑56.

Explanation:

The atomic abundance of the isotopes of Iron is:

⁵⁴Fe: 5.82%

⁵⁶Fe: 91.66%

⁵⁷Fe: 2.19%

⁵⁸Fe: 0.33%

Where the Iron-56 is the most abundant isotope of Iron atom

As atomic mass is defined as the sum of the masses of the ions multiplied by its abundance, and the Iron-56 is the most abundance isotope, the atomic mass of Fe most be similar to the ⁵⁶Fe mass because is the most abundant isotope.

Right option is:

Iron‑56 is the most abundant isotope, so the atomic mass of iron is most similar to the mass of iron‑56.

the atomic abundance of the isotopes of Iron is:

⁵⁴Fe: 5.82%

⁵⁶Fe: 91.66%

⁵⁷Fe: 2.19%

⁵⁸Fe: 0.33%

Since the Iron-56 is the most abundant isotope of the Iron atom

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Answer:

give me brainliest

Explanation:

The shielding effect sometimes referred to as atomic shielding or electron shielding describes the attraction between an electron and the nucleus in any atom with more than one electron. The shielding effect sometimes referred to as atomic shielding or electron shielding describes the attraction between an electron and the nucleus in any atom with more than one electron.

Answer:

The shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud

Explanation:

i am not sure but i hope it will help you

Answer:

c. match the number of each element in the name.

Explanation:

For making the formula of covalent compound, we must write the symbol of the first element of covalent compound and then write the name of the second element and add the suffix with the symbol of second element. Also put the number of each element with the name which indicates the quantity of elements that take part in forming new covalent compound.

Aluminum and Sodium Nitrate: No Reaction

Sodium is a chemical element found in nature as a silver-white metal. It is the sixth most abundant element in the Earth's crust, making up around 2.8 percent of the total mass of the crust. It is also one of the most important elements in human diet. Sodium is essential for many biological processes, such as maintaining water balance, transporting nutrients, and regulating nerve impulses. It can be found in many foods, such as table salt, dairy products, seafood, and processed foods. It is also an important component of many medications, such as antacids, diuretics, and blood pressure medications. Without adequate sodium in the diet, people may experience headaches, fatigue, muscle cramps, and other symptoms. Too much sodium in the diet, however, can increase the risk of high blood pressure, stroke, and heart disease.

Aluminum is more reactive than sodium, so a reaction will not occur when they are combined. Aluminum will not react with the sodium nitrate because sodium is not reactive enough to cause a reaction.

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4. The process which leads to transition from the above task are as follows:

5. The two processes that cause transition from each given below:

6. The major reason why water shortages are the problems for many people around the world is simply because of climatic change which alters the weather of a given place at a period of time, thereby leading to water insufficiency.

Melting refers to a chance of state of matter which refers to the process whereby a solid substance changes to liquid.

From the context of the above task, river ice melts into river in a process known as melting.

In conclusion, we can now deduce from the explanation given above that transition is a process which involves the change in form of matter.

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C₅H₆ is the first pentyne, C₆H₁₂ is the first hexyne, C₇H₁₀ is the first heptyne,

C₈H₁₂  is the last pentyne (this is 1-octyne). pentyne: 1-Butyne, hexyne: 3-methylpentane, heptyne: 3,3-dimethylbut-1- ene, and octyne: 5-(2-methylpropyl)-decane

Alkynes are hydrocarbons with at least one triple bond between two carbon atoms. Alkynes have the general formula. Alkyne must contain at least two carbon atoms, much like alkene.

The -ane ending in the name indicates that the substance is an alkane. Methane, ethane, propane, butane, pentane, hexane, heptane, and octane are the names of the alkanes. The general formula for alkanes.

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The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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15 moles of NaCl would have been used up in the reaction as a result.

The number of moles is obtained by taking each mass and dividing it by the molar mass. The molar mass of Ca₃(PO₄)₂ is 310.18 grammes/mole. The result is 0.016 moles of Ca₃(PO₄)₂ when five is divided by 310.18.

The balanced chemical equation for the reaction of sodium chloride (NaCl) and calcium phosphate (Ca₃(PO₄)₂) is:

3Ca₃(PO₄)₂ + 6NaCl → 6NaPO₄ + CaCl₂ + 2Ca₃(PO₄)₂

calculate the amount of NaCl consumed using the following proportion:

2 mol Ca₃(PO₄)₂ / 6 mol Sodium Chloride = 5 mol Ca₃(PO₄)₂ / x

Solving for x, we get:

x = (6 mol NaCl × 5 mol Ca₃(PO₄)₂) / 2 mol Ca₃(PO₄)₂

x = 15 mol NaCl

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Answer:48

Explanation:

Answer:  3. 0.125 X 10”23 molecules

Explanation:

Ratio of moles of NH₃ produced to moles of N₂ used: 2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used: 2 moles of NH₃ / 3 moles of H₂

From the balanced chemical equation:

N₂ + 3 H₂ ⟶ 2 NH₃

We can determine the ratio of moles of products to the moles of each reactant.

Ratio of moles of NH₃ produced to moles of N₂ used:

From the balanced equation, we can see that 1 mole of N₂ reacts to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used:

From the balanced equation, we can see that 3 moles of H₂ react to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 3 moles of H₂

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Given the equation of reaction;

N₂ + 3 H₂ ---> 2 NH₃

Calculate the ratio of the moles of produced to the moles of each of the reactants used. (Write two separate ratios.)

Answer: 2755.2 g of \(Fe\) will be produced from 24.6 mol of haematite.

Explanation:

The balanced chemical equation is:

\(Fe_2O_3+3CO\rightarrow 2Fe+3CO_2\)  

According to stoichiometry :

1 mole of \(Fe_2O_3\) produce = 2 moles of \(Fe\)

Thus 24.6 moles of \(Fe_2O_3\) will produce=\(\frac{2}{1}\times 24.6=49.2moles\)  of \(Fe\)  

Mass of \(Fe=moles\times {\text {Molar mass}}=49.2moles\times 56g/mol=2755.2g\)

Thus 2755.2 g of \(Fe\) will be produced from 24.6 mol of haematite.

Answer:

Explanation:

i) in keeping industrial machine cool

ii) in textile inustries for dying clothes

Answer:

A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes.The second change of phase is boiling, as the temperature stays the same during the transition to gas.

Explanation:

The de Broglie wavelength of an electron traveling at 1.59×105m/s is  0.4547 x 10⁻⁹ m.

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically regarded to be elementary particles.

The length scale at which a particle's wave-like characteristics are significant is indicated by its de Broglie wavelength. The symbol or dB is typically used to indicate the De Broglie wavelength. The de Broglie wavelength for a particle with momentum p is given by dB = hp.

λ = h/mv

Where,

λ = wavelength of electron

m = mass of electron = 9.11e-31 kg

v = speed of electron = 1.59 × 10⁵ m/s

h = constant

Therefore,

λ = (6.626x10⁻³⁴J-s) ÷  [(9.11e-31 kg) (1.59 x 10⁵ m/s)]

λ = 0.4547 x 10⁻⁹ m

Thus, The de Broglie wavelength of an electron traveling at 1.59×105m/s is  0.4547 x 10⁻⁹ m.

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According to Newton's second law, force equals mass multiplied by acceleration. As a result, in a car accident, the force exerted by the vehicle and its occupants decreases as the time required for the vehicle to stop increases.

We clearly observed in the Exploration that when two cars collide, each feels a force from the other.

According to Newton's third law, when one object exerts a force on another, the second object feels an equal and opposite force exerted by the first object. This is very clear in the two-object collision.

The force with which your body is struck in a collision is referred to as crash force. Crash force is equal to your body weight multiplied by the vehicle's speed.

Newton's second law states that force equals mass multiplied by acceleration. As a result, the force exerted by the vehicle and its occupants in a car accident decreases as the time required for the vehicle to stop increases.

Thus, this way it hits the car.

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We can see that an atom with 14 protons, 14 neutrons, and 16 electrons is unstable, and has a -2 charge.

So the correct option is the third one.

An atom with 14 protons, 14 neutrons, and 16 electrons is not stable. The number of protons in an atom, also known as its atomic number, determines its element and its chemical properties. In this case, the atom has 14 protons, which corresponds to the element silicon (Si) on the periodic table.

For an atom to be stable, it should have a balanced number of protons and electrons. Electrons are negatively charged particles that orbit the nucleus of an atom in energy levels or electron shells. The number of electrons in a stable atom should be equal to the number of protons, resulting in a neutral charge overall.

In this case, the atom has 14 protons and 16 electrons, which means it has two more electrons than protons, resulting in a net charge of -2. This is an example of an ion.

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The volume of 0.791 M KOH solution required to make 3.80 L of a solution with a pH of 12.30 is 57.6 mL.

The pOH of the KOH solution whose pH is 12.30 is calculated below as follows:

pH + pOH = 14

pOH = 14 - pH

pOH = 14 - 12.30

pOH = 1.70

The [OH⁻] is then calculated as below:

[OH⁻] = \(10^{-1.70}\)

[OH⁻] = 0.012 M

The  [OH⁻] of the new solution is 0.012

To find the volume of 0.791 M KOH solution required, we use the dilution formula.

C₁V₁ = C₂V₂

V₁ = C₂V₂ / C₁

V₁ = 3.8 * 0.012 / 0.791

V₁ = 0.0576 L or 57.6 mL

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you can use this method to balance any equation,

write you elements down , then start balancing them one after the other,

starting from metals , to non metals

it's better to balance hydrogen and oxygen the last and in most cases , they are automatically balanced

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Answer:

A.

It indicates the direction in which the reaction occurs.