Why should we clean our glassware immediately after use?

Answer:

The molar mass of O is 16 g/mol and since we have 2 oxygen molecules we multiply 16 g/mol to get 32 g/mol.  Therefore our best option would be option C, 32 g/mol.

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Answer:

usually the perfumes are made of aromatic hydrocarbons invloving

cetone, ethanol, benzaldehyde, formaldehyde, limonene, methylene chloride, camphor, ethyl acetate, linalool and benzyl alcohol. which have density lower than the water hence they will float on the top of the water.

Hope this helps you

Explanation:

Answer:

113.8 J.

Explanation:

The following data were obtained from the question:

Mass (M) = 8.2 g

Change in temperature (ΔT) = 3.32 °C

Specific heat capacity (C) = 4.18 J/gºC

Heat required (Q) =..?

The heat required to raise the temperature of the water by 3.32 °C

can be obtained as follow:

Q = MCΔT

Q = 8.2 × 4.18 × 3.32

Q = 113.8 J

Therefore, the amount of heat required to raise the temperature of the water is 113.8 J.

1.

\(1.20 \: mol \times \frac{6.02 \times {10}^{23} }{1 \: mol} = 7.224 \times {10}^{23} atoms\)

2.

\(9.25 \times {10}^{25 \:} molecules \times \frac{1 \: mol}{6.02 \times {10}^{23} } \)

\( = 153.654485 \: moles\)

3.

molar mass = 3(24.31) + 127.60 + 5(32.07)

molar mass = 360.88 g

4.

molar mass = 3(58.93) + 2(30.97) + 8(16.00)

molar mass = 366.73 g

5.

molar mass = 98.09

\(125 \: g \times \frac{1 \: mol}{98.09 \: g} = 1.274339892 \: moles\)

//

I'm too lazy to do the rest but you should get a general idea of how to do it.

Also, round as you wish!

Ayo, thanks for my points

Answer:

Number 2 is Direction

Explanation:

The old answer for number four was incorrect

I apologize for the inconvenience but I do not have an answer that fits in the lines for number 4

Answer:

Mole Ratio Fraction

Explanation:

That's the answer.......

Answer:

Explanation:

Mole Ratio Fraction

The percent yield for this reaction is 81.9%.

To calculate the percent yield, we need to use the following formula:
Percent yield = (actual yield / theoretical yield) x 100
We are given that the theoretical yield is 24.9 g and the actual yield is 20.4 g. Plugging these values into the formula, we get:
Percent yield = (20.4 / 24.9) x 100
Percent yield = 81.9%
It is important to note that the percent yield is a measure of the efficiency of a reaction. A high percent yield indicates that a large percentage of the reactants were converted into products, whereas a low percent yield suggests that some of the reactants were lost or that side reactions occurred. In this case, a percent yield of 81.9% indicates that the reaction was fairly efficient and that most of the reactants were converted into products. However, it is still important to consider why the actual yield was lower than the theoretical yield and to optimize the reaction conditions to improve the yield in future experiments.

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Answer:

5.2 moles of  KClO₃  are needed

Explanation:

Given data:

Number of moles of potassium chlorate needed = ?

Number of moles of O₂ formed = 7.8 mol

Solution:

Chemical equation:

2KClO₃      →     2KCl + 3O₂

now we will compare the moles of KClO₃ and  O₂.

                   O₂        :         KClO₃    

                    3          :           2

                   7.8        :          2/3×7.8 = 5.2

5.2 moles of  KClO₃  are needed.

No, it's a bad idea to boil NaOH in a beaker. Even a dilute solution of NaOH will attack and etch glass at its boiling point.

When boiling NaOH, the solid dihydrate might melt straightly into a solution at 13.35 °C; however, boiling once the temperature exceeds 12.58 °C. it often decays into a solid monohydrate and a liquid solution. As it boils it will get more concerted and the NaOH corrosive effect will concentrate on a smaller top area. The solution may splatter or boil. Here is how to build a sodium boiling hydroxide solution safely, along with recipes for several common.

The dissolution of NaOH sodium hydroxide in water is conducted by the release of an amount of heat because the solvation of hydroxide ions and sodium ions is most exothermic. Solvation is the NaOH proceed by which ions in a solid boiling dissociate from each other and interact with water molecules.

So we can conclude that The solubilization curve tends to boil to carry lower NaOH concentration with the increase in temperature

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The mathematical formula for the gas pressure (in atm) at 50.0 °C is P2= 2.17 atm.

Under normal temperatures and pressures, substances that are totally in a gaseous state are referred to be gases. Certain solids or liquids have an accompanying gaseous phase known as a vapour. Smoke is a thin solid that results from insufficient burning.

The price hike is attributed by AAA to an increase in fuel demand. "Pump prices have risen as a result of increased gas demand and limited supplies. Drivers will probably continue to experience pump price increases if demand grows "in line with AAA.

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Both the Heisenberg uncertainty principle and the Schrödinger wave equation led to the concept of atomic orbitals, hence option D is correct.

The Heisenberg uncertainty principle claimed that it was impossible to know an electron's position and velocity at the same time. It gave rise to the notion that an electron would follow an orbital path, along which a general area could be identified.

It is defined as the presumption that a classical ensemble is susceptible to random momentum fluctuations of a strength that is dictated by and scales inversely with uncertainty in position.

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The number of ionic bond in copper is zero.

Pure copper or any pure metal for that matter are examples of metallic bonds, which are neither ionic nor covalent. The copper atoms are stacked very tightly in a solid lattice. In fact it has a face centered cubic lattice which is the closed packing of atoms possible. Each atom has twelve nearest neighbors which allows their 4s orbitals (mostly) to have the optimal overlap. All of these orbitals therefore combine in one gigantic band of delocalized orbitals that spans the entire crystal with its myriad atoms. This band is only partly filled and the difference in energy between one state and the next is puny, which explains copper’s outstanding conductive properties.

Therefore, the bonding in copper has a metallic character.

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Correct option:

The elements form ions with multiple charges is given by option B and D, i.e., Iron and Cobalt

The electronic configurations of elements(assumed):

\(A. \,Zinc\,-[Ar]\,3d^{10}4s^{2}\\\\B.\,Iron\,-[Ar]3d^64s^2\\\\C.\, Sodium\, [Ne]3s^1\\\\D.\,Cobalt\,[Ar]3d^74s^2\\\\E.\,Silver\,[Kr]4d^{10}5s^1\)

These electronic configurations are based many factors-

1. (n+l) energy rule which states higher the value of (n+l), higher will be the energy of the orbital.

2. Fully filled and half filled orbitals are more stable than partially filled orbitals.

Now,

Elements of d-block have multiple oxidation states. Zinc has fully filled d-orbitals. It is not considered as d-block metal as it has only 1 oxidation state, i.e, +2.

Sodium exists only in +1 oxidation state.

Also Silver exists in +1 oxidation state.

So, the correct answer is Iron and Cobalt which can form ions with multiple charges.

Correct options are B and D.

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Answer:

A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work.

Explanation:

The newer wave technology of Wi-Fi systems, which uses radio waves  with higher frequencies than those used by AM and FM radio, is most likely used to transmit more information in a shorter time, which is option D.

Higher frequency waves have shorter wavelengths, which means they can carry more information in a given amount of time. Wi-Fi systems use higher frequency radio waves than AM and FM radio, allowing them to transmit more data over a shorter period of time.

This is why Wi-Fi is able to provide high-speed internet access and support streaming of videos, music, and other multimedia content.

Option A, to safely store information for long periods of time, is not directly related to electromagnetic wave technology, as this is more related to data storage technology, such as hard drives, solid-state drives, and other forms of non-volatile memory.

Option B, to send information over long distances, is a capability of all electromagnetic waves, including AM and FM radio waves, as well as Wi-Fi waves. However, the specific frequencies and technologies used may vary depending on the requirements of the application.

Option C, to send information using sound waves instead of radio waves, is not relevant to Wi-Fi technology, as sound waves are not used for wireless communication. Sound waves are mechanical waves that require a medium, such as air or water, to travel through, while electromagnetic waves can travel through a vacuum, such as space.

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Answer:

Metal name (charge in roman numerals) Non metal

for example Iron (III) chloride

Explanation:

The rule for naming special transition metal are as follows -

a) First name the transition metal

b) Now write the name of the non metal in the chemical formula.

c) Write the charge for the non metal.

d) If there is a polyatomic ion, write the Common Ion Table ,its formula and charge.

e) Based on the total charge on the non-metal or polyatomic ion, deduce the total charge on the transition metal

f) Write the charge of transition metal after the name of metal in Roman Numeral in parentheses

Answer:

more reactents and products

Answer:

Neutral carbon-12 (or any carbon atom) has 6 electrons with a total negative charge of 6e- orbiting a nucleus with a total positive charge of 6e+, so that the total net charge is zero. The nucleus is made up of 6 protons, each with a positive charge of e+, and 6 neutrons, each with zero charge.

Explanation:

Answer:

Neutral Carbon-12 Atom

The long-chain molecules that consist of many repeating units are called polymers. Polymers are large macromolecules composed of monomer units that are chemically bonded together in a repetitive pattern.

The repeating units, also known as monomers, are linked through covalent bonds, creating a chain-like structure.

Polymers can have various sizes and complexity, ranging from simple structures like polyethylene to highly intricate and specialized macromolecules like proteins and DNA.

It is noticed that due to their repeating nature, polymers often possess unique physical and chemical properties, making them useful in a wide range of applications, including plastics, textiles, adhesives, and biomedical materials.

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Answer: the answer is n= 0.487 mol

Explanation: i took the test and got it right

The molar mass of calcium hydroxide, Ca(OH)₂ is 74.10 g/mol. The moles of the K₂SO₄ is 0.086 mol . The grams of the glucose is 639 g.

The molar mass of the Calcium oxide , Ca(OH)₂ is :

Ca(OH)₂ = 40 + 2( 15.99 + 1 )

              = 74.10 g/mol

The moles of the  K₂SO₄ in the 15 g of the  K₂SO₄ :

Moles = mass / molar mass

Moles = 15 / 174.25

Moles = 0.086 mol

The moles of the glucose, C₆H₁₂O₆ = 3.55 mol

The mass of the glucose = moles × molar mass

                                         = 3.55 × 180

                                         = 639 g

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The best radioactive isotope for age-dating a rock from 50,000 years ago would be Carbon-14 (14C).

Carbon-14 (14C) is the most suitable radioactive isotope for dating materials up to approximately 50,000 years old, making it ideal for age-dating a rock from 50,000 years ago. This is because 14C is formed in the upper atmosphere when cosmic rays interact with nitrogen, and it is incorporated into living organisms through photosynthesis or consumption. After an organism dies, the 14C begins to decay at a known rate, known as the half-life, which is approximately 5730 years. By measuring the remaining amount of 14C in a sample, scientists can determine how long it has been since the organism died and, therefore, date the rock or material containing organic matter to estimate its age. Other radioactive isotopes with longer half-lives, such as Uranium-238 or Potassium-40, are better suited for dating much older rocks or minerals.

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The StartBracket upper O upper H superscript minus EndBracket equals StartFraction equation [OH-] = 1.0 x \(10^_-14\)/ [H+] is used to calculate [OH-] from [H+]. It is derived from the ion product constant for water.

The condition that accurately demonstrates the way that you could work out [OH-] from [H+] is:

[Goodness ] = 1.0 x \(10^_-14\)/[H+]

This condition is gotten from the particle item consistent for water, which is:

Kw = [H+][OH-] = 1.0 x \(10^_-14\)

At 25°C, the convergence of H+ and Gracious in unadulterated water are equivalent and each is equivalent to 1.0 x\(10^_-7\) mol/L. In this way, the pH of unadulterated water is 7.

On the off chance that the grouping of H+ in an answer is known, the centralization of Goodness can be determined involving the particle item consistent for water and reworking the condition to settle for [OH-]. This is on the grounds that the convergence of H+ and Goodness are conversely relative to one another.

Assuming the pH of the arrangement is known, the grouping of H+ can be determined utilizing the condition:

pH = - log[H+]

and afterward subbed into the situation to ascertain [OH-].

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The balanced chemical equation between pottasium and chlorine is as follows: 2K + Cl₂ → 2KCl. It is a combination reaction.

A chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

According to this question, a chemical reaction occurs between potassium metal and chlorine gas to form pottasium chloride as follows:

2K + Cl₂ → 2KCl

The chemical reaction is a combination reaction because it involves the combination of two elements to form a compound.

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Answer:

true is the answer of first

Which of the halves that of compounds will make up the buffer solution in a solution Any of the halves that of substances, when present in a solution, will make it a buffer solution None of the above.

As a result, it's essential to have liquids whose pH doesn't really alter even when strong alkalies nor strong acids are added. These are referred to as buffer solutions. The ability of a buffer to withstand a change in pH is known as buffer capacity.

it can neutralize a small amount of additional acid or base, the pH of the liquid is kept comparatively steady.

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Answer:

they are either donated to or taken by another atom to achieve octet arrangement

Explanation:

for example Na+ and Cl- .. they both have one extra and one less electron .

so they donate and receive one electron to/from each other to achieve the octet arrangement ..

Therefore, the pH of a 0.369 M solution of carbonic acid is approximately 5.91.

To calculate the pH of a solution of carbonic acid (H2CO3), we need to consider the dissociation of carbonic acid and the equilibrium expression for its ionization.

The dissociation of carbonic acid can be represented as follows:

H2CO3 ⇌ H+ + HCO3-

The equilibrium expression for this dissociation is:

Ka1 = [H+][HCO3-]/[H2CO3]

Given that the Ka1 value for carbonic acid is 4.50 x 10^-7, we can set up an ICE (Initial, Change, Equilibrium) table to determine the concentration of H+ in the solution.

Let's assume x mol/L is the concentration of H+.

H2CO3 ⇌ H+ + HCO3-

Initial: 0 0 0.369 M

Change: -x +x +x

Equilibrium: 0 x 0.369 + x

Using the equilibrium expression, we can write:

4.50 x 10^-7 = (x)(0.369 + x)

Since the value of x is much smaller compared to 0.369, we can assume that x is negligible in comparison and simplify the equation:

4.50 x 10^-7 ≈ (x)(0.369)

Solving this equation for x gives:

x ≈ 4.50 x 10^-7 / 0.369

x ≈ 1.22 x 10^-6

The concentration of H+ in the solution is approximately 1.22 x 10^-6 M.

To calculate the pH of the solution, we use the equation:

pH = -log[H+]

pH = -log(1.22 x 10^-6)

pH ≈ 5.91

Therefore, the pH of a 0.369 M solution of carbonic acid is approximately 5.91.

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