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Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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Answer:

The limiting reagents seemed to be those that were consumed first .

Because when this reagent is consumed, the reaction stops. The quantity of this determines the total quantity of the product formed.

Explanation:

A limiting reagent is one that is consumed in its entirety. In this way, it delimits the amount of product that can be formed.

Take the case of two substances that interact and produce a chemical reaction. If one of the substances runs out as it is consumed during the process, the reaction will stop. The reagent consumed acts as a limiting reagent, that is, it limits the possibility of the reaction proceeding, and therefore it also limits the amount of the product generated by the reaction.

Answer:Biopolymer: the monomeric amino acids are linked through an

amide bond (the carboxylic acids of one AA with the α-amino

group of a second)

Explanation:

In this reaction, elimination of water molecule takes place, therefore this reaction is elimination reaction. So, option C is correct.

In a one- or two-step method, two substituents are removed from a molecule in an organic reaction known as an elimination reaction. The E2 reaction is the name given to the one-step mechanism, and the E1 reaction to the two-step mechanism.

Dehydration and oxidation are the two basic techniques used in this kind of process. Dehydrohalogenation. Because it allows us to remove one of the variables and answer a more straightforward equation.

The halogenoalkane and either sodium or potassium hydroxide solution are the same chemicals you use for replacement or elimination.

Thus, option C is correct.

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Answer:

Its D and E

Explanation:

i took the test and the other guy who answered gave u half of the answer

hope this helps

pls mark brainliest

The information which can be inferred about the Sun according to the graph include:

This is defined as a pictorial representation of data in an organized manner.

From the graph, we can infer that the Sun has an intermediate temperature and is less brighter than most stars.

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Answer:

convection

Explanation:

i believe

The popcorn in the pot pops up because of the conduction process when heated. The solid particles transfers heat energy by conduction mode.

There are three mode of heat transfer namely, conduction, convection and radiation. Conduction is taking place in solids whereas, convection is taking place in liquids and gases. Radiation is the way of heat transfer through vacuum.

In conduction, the heat energy transfers from one molecule to the other which are closely packed in the solids as in a chain. Thus, heat easily moves through the chain.

In gases and liquids, the hot molecules moves to the surface to make other molecules hot and this flow of molecules make the entire substance hot.

Popcorn is a solid substance thus, able to conduct heat energy. This heat energy leads them to thermal vibration and they pop up from the hot pot. Therefore, it is an example of conduction.

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The standard enthalpy change for the reaction 2A+B⇌2C+2D is  664 kJ/mol and The heat that is absorbed when 3.70 mol of A reacts is 2456.8  J

The heat changes that take place as reactants combine to generate a product are measured by the enthalpy of a reaction.

The following formula can be used to determine the enthalpy change of a reaction:

Hess's law states that

Enthalpy of reaction =  product's enthalpy - the reactant's enthalpy.

Considering the given reaction: 2A + B ⇌ 2C + 2D  

Enthalpy of reaction =  product's enthalpy - the reactant's enthalpy.

Enthalpy of reaction (ΔH°f) = (2 C + 2 D) - (2 * A + B)

Enthalpy of reaction  (ΔH°f)  = {[2(223) + 2(-523)] - [2(-245) + 2(-387)]}

Enthalpy of reaction  (ΔH°f)  = 664 kJ/mol

ΔH = q ÷ n

ΔH = molar enthalpy (heat) of solution

q = amount of energy (heat) released or absorbed

n = moles of solute

so. q = ΔH xn

q = ΔH xn

q = 664 kJ/mol x 3.70 mol

Q= 2456.8  J

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Answer:

One oxygen atom is tetrahedral while the other is trigonal planar

Explanation:

Acetic acid contains two oxygen atoms. The two oxygen atoms are different and have different geometries.

The first oxygen atom which is part of the carbonyl moiety in the molecule is in a trigonal planar geometry since it is sp2 hybridized.

The second oxygen atom is in sp3 hybridized state hence it is tetrahedral.

Thus one oxygen atom is tetrahedral and the other is trigonal planar in acetic acid.

Answer:

log = ( - 0.51 z 2) / ( 1 + ( / 305)

Explanation:

Answer:

The frequency would be 6.88*10^14Hz

\(v=\frac{c}{lambda} = \frac{3.00*10^8 m/s}{4.36*10^-7m}\)

We can solve the equation above to get the answer

The frequency of this radiation should be \(6.88\times 10^{14}\ Hz.\)

Since  A mercury lamp emits radiation with a wavelength of \(4.36 \times 10^{-7}\)m

So here the frequency should be

\(= c \div \lambda\\\\= 3.00 \times 10^{8} \div 4.36 \times 10^{-7} m.\\\\= 6.88\times 10^{14}\ Hz.\)

Hence, we can conclude that The frequency of this radiation should be \(6.88\times 10^{14}\ Hz.\)

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These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Option B)

A colloid is a type of mixture in which particles are dispersed throughout a medium, creating a homogeneous appearance. Unlike solutions, where the particles are completely dissolved, and suspensions, where the particles settle out, colloids have particles that are larger than those in solutions but smaller than those in suspensions. One characteristic of colloids is that they can scatter light due to the size of the particles. This scattering of light is known as the Tyndall effect. Examples of colloids include milk, fog, and aerosol sprays. These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Therefore option B) is correct

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Note Complete Question

which is an example of a colloid?

a mixture that settles out,

b mixture that scatters light,

c mixture that is separated by filtration,  

d salt and water mixture?

Answer: A. 212

Explanation:

Answer:

C

Explanation:

You can’t round a phone number or Pin code

why would you round your birth year?

Magnesium was 5.0g before heating.

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Answer:it is in the first sentence

Explanation:i did this and got it correct

Molecules with polar bonds or specific functional groups with asymmetric vibrations are most strongly affected by infrared photons. Molecules with nonpolar bonds or symmetric functional groups that lack infrared-active vibrations are least affected.

When a photon interacts with a molecule, the degree to which the molecule is affected depends on whether the photon's energy matches the energy required to excite the molecule's vibrational modes. Infrared (IR) photons have energies that correspond to molecular vibrations, and therefore, molecules with certain characteristics are most strongly affected by them. Molecules with polar bonds or functional groups containing asymmetric stretching or bending vibrations are most strongly affected by infrared photons. Examples include water (H2O), carbon dioxide (CO2), ammonia (NH3), and various organic compounds with functional groups like carbonyl (C=O) and hydroxyl (OH). Molecules with nonpolar bonds or symmetric functional groups that lack vibrational modes in the infrared region are least affected by infrared photons. These include diatomic molecules like oxygen (O2), nitrogen (N2), and noble gases such as helium (He). Hence Molecules with polar bonds or specific functional groups with asymmetric vibrations are most strongly affected by infrared photons. Molecules with nonpolar bonds or symmetric functional groups that lack infrared-active vibrations are least affected.

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Answer:

Explanation:

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:

HCl(aq) + NaOH(s) → NaCl(aq) + H2O(l)

From the balanced equation, we can see that one mole of hydrochloric acid reacts with one mole of sodium hydroxide to produce one mole of sodium chloride and one mole of water.

First, we need to determine which reactant is limiting, i.e., which reactant is completely consumed in the reaction. To do this, we need to compare the number of moles of each reactant, using their respective molar masses:

Molar mass of HCl = 1.008 g/mol (atomic weight of hydrogen) + 35.45 g/mol (atomic weight of chlorine) = 36.46 g/mol

Molar mass of NaOH = 22.99 g/mol (atomic weight of sodium) + 16.00 g/mol (atomic weight of oxygen) + 1.008 g/mol (atomic weight of hydrogen) = 39.99 g/mol

Number of moles of HCl = mass / molar mass = 30.0 g / 36.46 g/mol ≈ 0.823 mol

Number of moles of NaOH = mass / molar mass = 14.3 g / 39.99 g/mol ≈ 0.358 mol

Since the stoichiometric ratio between HCl and NaOH is 1:1, NaOH is the limiting reactant because it has fewer moles than HCl.

Therefore, we can calculate the maximum mass of NaCl that can be produced by the reaction using the number of moles of NaOH:

Number of moles of NaCl produced = number of moles of NaOH used in the reaction = 0.358 mol

Mass of NaCl produced = number of moles of NaCl produced x molar mass of NaCl

Molar mass of NaCl = 22.99 g/mol (atomic weight of sodium) + 35.45 g/mol (atomic weight of chlorine) = 58.44 g/mol

Mass of NaCl produced = 0.358 mol x 58.44 g/mol = 20.9 g

Therefore, the maximum mass of NaCl that can be produced by the reaction is approximately 20.9 g

In the case of a real gas when you're using Van Der Waals equation, the volume of a real gas is considered as (Vm - b), where b can be considered as the volume occupied by per mole.

Therefore, when the ideal gas law gets substituted with V = Vm  - b, it is given as : P(Vm  - b) = nRT

The presence of intermolecular attraction P was modified as follows.

\(\frac{P+a}{V^{2} } (Vm- b) = RT\\\frac{P+an^{2} }{V^{2} } (V - nb) = nRT\)

Where, Vm: molar volume of the gas

R: universal gas constant

T: temperature

P: pressure

V: volume

Thus, it is possible to reduce Van Der Waals equation to the ideal gas law as PVm = RT.

What is the significance of the Ideal gas Law?

The ideal gas law only functions as an approximation approach when high accuracy is not necessary because it describes the behaviour of ideal gasses, which there aren't any of. It is a solid introduction to the fundamental behaviour of gases and works well as a teaching tool, which is why it is taught to the majority of university students as part of any introduction to physics. In essence, the ideal gas law enables students to comprehend ideas such as the process of thermodynamic cycles, such as an engine, the reason an airbag expands, what transpires to a balloon at high altitude, and other related ideas.

Hence, Van Der Waals equation to the ideal gas law as PVm = RT.

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Answer:

0.0238 moles NaOH

Explanation:

To find the amount of moles, you need to

(1) convert the volume from mL to L (1,000 mL = 1 L)

(2) calculate the amount of moles (using the molarity equation)

It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 3 sig figs.

 125.0 mL NaOH                  1 L
---------------------------  x  ---------------------  =  0.1250 L NaOH
                                         1,000 mL

Molarity = moles / volume (L)                    <----- Molarity equation

0.190 M = moles / 0.1250 L                       <----- Insert values

0.0238 = moles                                         <----- Multiply both sides by 0.1250

Answer:

Explanation:

The equation says for every 3 moles of barium chloride you can make 2 aluminum chloride.

(8/3)*2 = 5.33 moles

First, we need to write out the balanced chemical equation for the reaction: 4 KO2 + 2 CO2 → 2 K2CO3 + 3 O2

From the equation, we can see that 4 moles of KO2 react with 2 moles of CO2 to produce 3 moles of O2. Therefore, we need to convert the given masses of KO2 and CO2 into moles:

moles of KO2 = 2.61 g / molar mass of KO2 = 2.61 g / 71.10 g/mol = 0.0367 mol
moles of CO2 = 4.46 g / molar mass of CO2 = 4.46 g / 44.01 g/mol = 0.1013 mol

Next, we need to determine the limiting reagent (the reactant that will be completely consumed in the reaction) by comparing the mole ratios of KO2 and CO2 in the balanced equation. The ratio of moles of KO2 to moles of CO2 is:
0.0367 mol KO2 / 4 mol KO2 per 2 mol CO2 = 0.0184 mol CO2

Since this ratio is less than the actual number of moles of CO2 we have (0.1013 mol), CO2 is in excess and KO2 is the limiting reagent.

Using the mole ratio from the balanced equation, we can calculate the number of moles of O2 produced:

moles of O2 = 3 mol O2 per 4 mol KO2 × 0.0367 mol KO2 = 0.0275 mol O2

Finally, we can convert the moles of O2 to grams:

mass of O2 = moles of O2 × molar mass of O2 = 0.0275 mol × 32.00 g/mol = 0.88 g
Therefore, 2.61 g of KO2 and 4.46 g of CO2 would produce 0.88 g of O2.

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To measure reaction heat under isochoric conditions, a bomb calorimeter is needed.

This device is designed to maintain a constant volume (isochoric) during the reaction, allowing for accurate measurement of reaction heat. To improve the accuracy of the coffee cup calorimeter for measuring reaction heat under isobaric conditions, a modification that could be made is to use a stirring device to ensure uniform mixing of the reactants and to minimize heat loss to the surroundings.

Additionally, a lid with a small hole could be placed over the top of the calorimeter to prevent heat loss while still allowing for pressure equalization. These modifications would help to minimize errors in heat measurement and improve the accuracy of the results obtained.

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The mass (in grams) of AsH₃ made from 22.22 grams of H₂ is 571.63 grams

The mass of AsH₃ produced can be obtained as illustrated below:

2As + 3H₂ -> 2AsH₃ + 150 Kcal

From the balanced equation above,

6.06 grams of H₂ reacted to produce 155.9 grams of AsH₃

Therefore,

22.22 grams of H₂ will react to produce = (22.22 × 155.9) / 6.06 = 571.63 grams of AsH₃

Thus, from the above calculation, we can conclude that the mass of AsH₃ produced from the reaction is 571.63 grams

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Answer:

the generation of electricity and other energy jointly, especially the utilization of the steam left over from electricity generation to produce heat.

I hope it helps!! Have a nice day

Answer:

Cogeneration r is the use of a heat engine or power station to generate electricity and useful heat at the same time.

Answer:

Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO

Explanation:

The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.

The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.

The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.

The methyl groups are non-polar and do not have any significant reactivity.

The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.

The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.

The Electronegativity Difference between the C and H atoms in ethane would be 0.35.

The structure of ethane is as follows:A) Electronegativity of Carbon (C) is 2.55, and Hydrogen (H) is 2.20.  Electronegativity Difference (ΔEN) = 2.55 - 2.20 = 0.35B) There would be a partial negative charge on the Carbon atom, and there would be a partial positive charge on the Hydrogen atoms.C) The ethane molecule is less polar than water. This is because the electronegativity difference between the Carbon and Hydrogen atoms is low (0.35) in ethane, whereas the difference between the Oxygen and Hydrogen atoms is high (1.4) in water. Due to the high electronegativity difference in water, it creates a dipole moment, making it a polar molecule. Whereas ethane has no dipole moment and is considered a nonpolar molecule.D) If the oceans were filled with ethane instead of water, then there would be no hydrogen bonding. As a result, many of the physical properties of the ocean would be different.

For example, the freezing point of the ocean would be much lower because of the weak intermolecular forces between ethane molecules. Due to the absence of hydrogen bonding, the viscosity of the oceans would be less than that of water, leading to easier movement of organisms.

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Answer:

The mass of PCl₃ is 332.3 g.

The molecules of PCl₃ is \(1.45\times10^{24}\ g\)

Explanation:

Given that,

Mass of P₄ = 75.0 g

Mass of Cl₂ = 275 g

We know that,

The reaction is

\(P_{4}+6Cl_{2}\Rightarrow 4PCl_{3}\)

We need to calculate the moles of P₄

Using formula of moles

\(n=\dfrac{m}{M}\)

Put the value into the formula

\(n=\dfrac{75.0}{123.89}\)

\(n=0.61\ moles\)

We need to calculate the moles of Cl₂

Using formula of moles

\(n=\dfrac{m}{M}\)

Put the value into the formula

\(n=\dfrac{275}{70.906}\)

\(n=3.89 moles\)

We need to calculate the number of moles of \(4PCl_{3}\)

Moles in 1 P₄ = 0.61

So, \(moles\ in\ 4PCl_{3} = 4\times0.61\)

\(moles\ in\ 4PCl_{3}=2.42\ moles\)

We need to calculate the mass of \(PCl_{3}\)

Using formula of mass

\(m=M\times n\)

Put the value into the formula

\(m=137.3\times2.42\)

\(m=332.3\ g\)

We need to calculate the molecules of \(PCl_{3}\)

Using formula of molecules

\(molecules=n\times N\)

Where, n = number of moles

N = avagadro number

Put the value into the formula

\(molecules=2.42\times6.023\times10^{23}\)

\(molecules=1.45\times10^{24}\ g\)

Hence, The mass of PCl₃ is 332.3 g.

The molecules of PCl₃ is \(1.45\times10^{24}\ g\)

There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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A sample of gas at 2815 torr is cooled from 150.0 C to 100.0 C. Assuming the volume is constant, 2482.2torr is the pressure in atm of the gas at 100.0 C.

The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure (symbol: p / P). The pressure in relation to the surrounding air pressure is known as gauge pressure, also spelt gauge pressure.

Pressure is expressed using a variety of units. Some of these are calculated by dividing a unit of force by a unit of area; for instance, the metric system's unit of pressure, a pascal (Pa), is equal to one newton / square metre (N/m2).

P₁/T₁=P₂/T₂

2815 ×373/423=2482.2torr

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