What belief has the scientist in The Daily Times article developed as a result of experimentation?
1. He believes that if deafness is caused by a defective gene, gene therapy has the potential to cure many forms of hearing loss.
2. He believes that deafness is not hereditary, therefore there is no gene treatment that applies.
3. He believes that the scientists that conducted the study do not have the credentials to validate the results.
4. He believes that the tests are not valid and the results are not true.

Answer:

we need we need to calculate normality of solution to find out gram equivalent of solution

1) Convert grams to moles

The molar mass of Cu is 63.546 g/mol.

0.007553 mol of Cu is equal to 7.6*10^-3 mol of Cu.

.

Answer:

compound

Explanation:

Lithium aluminum hydride (LiAlH4) is a powerful reducing agent commonly used in organic chemistry. It is highly reactive due to its high electron density, which makes it an excellent source of hydride ions (H-). When added to a reaction mixture, LiAlH4 can reduce a wide range of functional groups, such as carbonyl compounds, aldehydes, ketones, esters, and carboxylic acids.

The mechanism of reduction involves the transfer of hydride ions from LiAlH4 to the functional group, leading to the formation of an alcohol or an aldehyde. This process is known as hydride transfer, and it results in the conversion of a carbonyl compound into its corresponding alcohol. The reaction is usually carried out in anhydrous conditions and under inert atmosphere to avoid any undesired side reactions.

In summary, lithium aluminum hydride is a versatile reducing agent that can reduce a wide range of functional groups. Its ability to transfer hydride ions makes it a valuable tool in organic synthesis for the preparation of alcohols and other reduced compounds.

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The mass of MgCO₃ is 1.9 g, the calculations are shown in the below section.

The balanced chemical reaction is shown below

Na₂CO₃   +   Mg(NO₃)₂     ⇒   2 NaNO₃   + MgCO₃

0.200 M   0.0450 M                                        ?

10.0           5.00 mL                                          ?

Since the volume and concentration of Mg(NO₃)₂ and Na₂CO₃  is given , we can calculate the number of moles for each of them and then determine the limiting reagent.

Convert the volume of  Mg(NO₃)₂and Na₂CO₃ to liters:

5.00 mL x ( 1 L/1000 mL ) =   5.00 x 10⁻³ L

10.00 mL x ( 1L/ 1000 mL ) = 1.000 x 10 ⁻² L

Number of  mol Mg(NO₃)₂ = ( 0.0450 mol /L  ) x 5.00 x 10⁻³ L

                                          = 2.25 x 10⁻⁴ mol Mg(NO₃)₂

Number of mol Na₂CO₃ = ( 0.200 mol / L ) x 1 x 10⁻² L  

                                       = 2.000 x 10⁻³  mol Na₂CO₃

Limiting reagent

= 2.25 x 10⁻⁴ mol Mg(NO₃)₂ x ( 1 mol Na₂CO₃ / mol  Mg(NO₃)₂ )

= 2.25 x 10⁻⁴ mol  Na₂CO₃ required .

Limiting reagent is Mg(NO₃)₂ since 2.25 x 10⁻⁴ mol  Na₂CO₃ is required to react completely with  2.25 x 10⁻⁴Mg(NO₃)₂, and there's an excess.

Number of  mole  of MgCO₃ produced

= 2.25 x 10⁻⁴ mol  Mg(NO₃)₂ x ( 1 mol MgCO₃ / 1 mol Mg(NO₃)₂ )

= 2.25 x 10⁻⁴ mol  MgCO₃

No. of Mole = mass/molar mass

Mass = No. of Mole × molar mass

2.25 x 10⁻⁴ mol  MgCO₃ x   84.31 g/mol  = 1.90 g

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Answer: 4.74 moles of gas are in the container.

Explanation:

1. Use the ideal gas law. PV = nRT. and re-arrange from moles by divided RT on both sides.

2.You should get the following equation: \(n=PV/RT\)

3.Insert values: \(n = PV/RT = \frac{(4.9 atm)(28 L)}{(0.082 (L*atm)/(K*mol)*(353K)} = 4.74 moles.\)

4.There are 4.74 moles in the container.

Good luck with chemistry!

Answer: Negatively

Explanation:

Answer:

Negative charges

Explanation:

like magnets attract only their opposite poles, the charges behave in the same way.

Mark me brainliest if I'm correct. :D

Answer:

In science, we have a name for this, called Avogadro's number, and it describes the number of representative particles in one mole of a substance.

Avogadro's number is

6.022

×

10

23

l

mol

−

1

−−−−−−−−−−−−−−−−−

The inverse mole unit tells us there are

6.022

×

10

23

particles of something *per mole*.

The official definition of the mole is the quantity that describes the number of elementary entities as there are atoms in

12

g

of isotopically pure carbon-12.

From this definition, we see that

1

mol

of pure

12

C

has a mass of exactly

12

g

. The mass of a substance in one mole of that substance is called the molar mass of that substance.

To find the number of moles of a substance present, we divide the mass of the substance by its molar mass, which we see from the definition of molar mass:

molar mass

=

mass

mol

mol

=

mass

molar mass

Explanation:

That for every 2 moles of \(CO_2\), 3 moles of \(O_2\)are produced according to the given reaction. This reaction can be utilized to potentially mitigate the effects of carbon dioxide emissions by converting them into oxygen gas, thereby helping to combat climate change and improve air quality.

The given reaction shows the conversion of carbon dioxide (\(CO_2\)) to oxygen gas (\(O_2\)) using potassium superoxide (\(KO_2\)). The reaction can be summarized as follows:

184 \(KO_2\)(s) + 2 \(CO_2\)(g) → 2 \(K_2CO_2\)(s) + 3 \(O_2\)(g)

In this reaction, 184 moles of \(KO_2\)react with 2 moles of \(CO_2\)to produce 2 moles of \(K_2CO_2\)and 3 moles of \(O_2\). This means that for every 2 moles of \(CO_2\), 3 moles of \(O_2\)are produced.

This reaction is significant because it provides a method to convert carbon dioxide, which is a greenhouse gas contributing to global warming, into oxygen gas, which is essential for respiration and the survival of living organisms. The reaction utilizes potassium superoxide as a reactant, which acts as an oxidizing agent to convert \(CO_2\)into \(K_2CO_2\)and release \(O_2\).

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Explanation:

For us to answer these questions, we have to know two formulas:

Therefore:

a) particles of Na = 1.50 mol × (6.022 × 10²³) particles/mol

                            = 9.033 × 10²³ particles

b) particles of Pb = 6.755 mol × (6.022 × 10²³) particles/mol

                            = 4.068 × 10²⁴ particles

c) particles of Si

             = (7.02 g ÷ 28.085 g/mol) × (6.022 × 10²³) particles/mol

             = 1.51 × 10²³ particles

The molecular weight of gas X would be 23.36 g/mol.

According to Graham, the rate of effusion of gases is inversely proportional to the square root of their molecular weights.

Graham's law can be mathematically expressed as:

\(r_1/r_2\) = \(\sqrt{\frac{m_2}{m_1} }\)

Where \(r_1\) and \(r_2\) are rates of diffusion or effusion of gases 1 and 2, and \(m_1\) and \(m_2\) are their molecular weights respectively.

In this case, \(r_x\) = \(2.5r_{SF6}\) and the molecular weight of Sf6 is given as 146 g/mol. Thus:

2.5 = \(\sqrt{\frac{146}{m_x} }\)

6.25 = 146/\(m_x\)

\(m_x\) = 146/6.25

      = 23.36 g/mol

In other words, the molecular weight of gas X would be 23.36 g/mol.

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Answer:

If the reaction requires energy, it is often indicated above the arrow. A capital Greek letter delta (Δ) is written on top of the reaction arrow to show that energy in the form of heat is added to the reaction; hv is written if the energy is added in the form of light.

Answer:

it means that to get the product, the reactants were heated

Answer

Explanation

Given:

Quantity of heat, Q = 1.0 BTU

Initial temperature, T₁ = 63 °F

Final temperature, T₂ = 64 °F

What to find:

The mass of water

Step-by-step solution:

1.0 BTU is the amount of heat energy required to raise one pound of water by 1ºF.

The first step is to convert BTU to joules, and °F to °C.

Conversion factor:

1.0 BTU = 1055.06 J

(°F − 32) × 5/9 = °C

So 63 (F = (633F -32) x 5/9 = 17.222C

64°F = (64FF - 32) x 5/9 = 17.787C

8 − 32) × 5/9 = 0°C°°°°°°

Answer:

liquid

Explanation:

A solid is defined as substance with a set volume and form. A liquid is defined as substance with a set volume but no fixed form. A gas is substance that does not have a definite volume or shape. Plasma, like a gas, has no set volume or shape.

Answer:

20.05  ×10²³ molecules

Explanation:

Given data:

Mass of hydrogen = 10 g

Number of molecules of ammonia = ?

Solution:

Chemical equation:

3H₂ + N₂       →      2NH₃

Number of moles of hydrogen:

Number of moles = mass / molar mass

Number of moles =  10 g /  2 g/mol

Number of moles =  5 mol

now we will compare the moles of hydrogen and ammonia.

                 H₂            :           NH₃

                  3             :            2

                   5            :           2/3×5 = 3.33 mol

Number of molecules of ammonia:

1 mole contain 6.022 ×10²³ molecules

3.33 mol × 6.022 ×10²³ molecules / 1 mol

20.05  ×10²³ molecules

One mole of H₂S gas contains 6.022 × 10²³ H₂S molecules. Hence, 2.50 mol of H₂S contains 1.50 × 10²⁴ molecules. Thus, option A is correct.

Any substance containing 6.022 × 10²³ number of atoms is called one mole of that substance. This number is called Avogadro number. Thus, one mole every elements contains Avogadro number of atoms.

Similarly a compound is made of molecules. One mole of a compound contains 6.022 × 10²³ number of molecules. The mass of a compound with Avogadro number of molecules is called its molar mass.

As any other compound, one mole of H₂S contains 6.022 × 10²³ molecules. Therefore, the number of molecules in 2.50 moles of H₂S is :

2.50 moles × 6.022 × 10²³ molecules/mol =  1.50 × 10²⁴molecules

Hence, the number of molecules present in 2.50 moles of H₂S is  1.50 × 10²⁴.

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Ultraviolet and infrared rays are harmful rays emitted during arc welding.

During arc welding, an intense electric arc is generated, producing various types of radiation. Ultraviolet (UV) rays are one form of harmful radiation emitted during the welding process. UV rays have a shorter wavelength than visible light and can cause damage to the skin and eyes, leading to sunburn, skin aging, and even long-term health risks such as skin cancer.

In addition to UV rays, infrared (IR) rays are also emitted during arc welding. IR rays have longer wavelengths than visible light and can generate heat. Prolonged exposure to IR rays can cause thermal burns and skin damage.

To protect against the harmful effects of UV and IR radiation during arc welding, welders typically use personal protective equipment (PPE) such as welding helmets with shaded lenses or filters. These lenses are designed to block or reduce the transmission of harmful UV and IR rays while allowing safe levels of visible light to pass through, ensuring the welder's safety.

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Answer:

There are 24*60 minutes in a day (ignoring the imperfections of the natural world, the Earth and Sun). So there are 24*60 valid 24 hour times (excluding seconds) on a digital clock.

A measure of time representing the interval between consecutive passages of the Sun across the meridian, averaged over one year. 1 day = 24 hr (86,400 sec) and 60 minutes.

hope it helps ya mate! :-P

In the electrolysis of aqueous sodium chloride, we predict to happen at the cathode: Reduction of hydrogen ions. The correct option is A.

In the electrolysis of aqueous sodium chloride (NaCl), the cathode is the electrode where reduction occurs. Reduction is the gain of electrons, and it occurs at the cathode.

At the cathode, two possible reduction reactions can occur: reduction of hydrogen ions (H⁺) or reduction of water (H₂O). In this case, the presence of aqueous sodium chloride suggests that there are both sodium ions (Na⁺) and hydrogen ions (H⁺) in the solution.

However, the reduction of hydrogen ions (H⁺) is more favorable at the cathode than the reduction of water. The hydrogen ions (H⁺) from the dissociation of water and the sodium chloride solution will be preferentially reduced to form hydrogen gas (H₂).

Therefore, the predicted reaction at the cathode in the electrolysis of aqueous sodium chloride is the reduction of hydrogen ions (H⁺) to produce hydrogen gas (H₂). The correct option is A.

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Answer:

A. True

Explanation:

Answer:

The test for carbon dioxide uses an aqueous solution if calcium hydroxide which is lime water.And when carbon dioxide is bubbled through it , the colourless lime water turns milky or chalky

An organic compound is composed of 49.31% carbon, 43.79% oxygen, and the rest hydrogen and  if the molar mass is 146.1 g/mol then the molecular formula of this compound is C₆H₁₀O₄(Adipic acid).

The chemical molecule with the formula (CH2)4(COOH)2 is termed as adipic acid or hexanedioic acid. It is the most significant dicarboxylic acid from an industrial standpoint; every year, around 2.5 billion kilograms of this white crystalline powder are manufactured, primarily as a precursor to the manufacture of nylon.

A molecular compound's kind and quantity of atoms of each element are indicated by its molecular formula.

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Answer:

+1

Explanation:

An atom is considered to be neutral before losing or gaining any electrons. They are neutral in charge because they initially have the same number of protons (with charge of +1 each) and electrons (with a charge of -1 each).

Consider charge in an electron like a balance, with positively charged protons on one side and negatively charged electrons on the other. When you have the same number of each, there is equal amounts of positive and negative charge so the atom is neutral with a charge of zero.

For example, potassium has 19 protons, and 19 electrons. This means it has  19 positive charges and 19 negative charges. If you take away one electron, it now has 19 positive charges and 18 negative charges. So there is one more positive charge than negative, which means it is now an ion (a charged atom) with a charge of +1.

The depreciation expense for the year ended December 31, 2016, given the straight-line method, a 5-year useful life, and a salvage value of $600, is $1,320.

The depreciation expense for the year ended December 31, 2016, can be calculated using the straight-line method, which allocates the cost of an asset evenly over its useful life. In this case, the equipment was purchased for $7,200 on July 1, 2016, and has a useful life of 5 years with a salvage value of $600.

To calculate the annual depreciation expense, we need to determine the depreciable cost, which is the original cost minus the salvage value. In this case, the depreciable cost would be $7,200 - $600 = $6,600.

Next, we divide the depreciable cost by the useful life to determine the annual depreciation expense. In this case, the annual depreciation expense would be $6,600 / 5 = $1,320.

Therefore, the depreciation expense for the year ended December 31, 2016, given the straight-line method, a 5-year useful life, and a salvage value of $600, is $1,320.

The depreciation expense is calculated by subtracting the salvage value from the original cost to determine the depreciable cost. Then, the depreciable cost is divided by the useful life of the asset to determine the annual depreciation expense.

In this case, the firm purchased equipment for $7,200 on July 1, 2016, with a 5-year useful life and a salvage value of $600. Therefore, the annual depreciation expense for the year ended December 31, 2016, would be $1,320.

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Answer:

your answer is 8000 ppm

Brainpop is an online educational resource that provides animated videos, interactive quizzes, and games on various subjects. One of the topics covered in Brainpop is bacteria, which are single-celled organisms that exist in different forms, some of which can cause disease.

To test the knowledge of students on bacteria, Brainpop offers a true or false worksheet that includes various statements related to bacteria. In this worksheet, students need to read each statement and determine whether it is true or false based on their understanding of the topic.
Some of the statements included in the Brainpop bacteria true or false worksheet are:
- Bacteria are always harmful to humans.
- Antibiotics can cure all types of bacterial infections.
- Bacteria can survive in extreme environments like the ocean floor and outer space.
- Bacteria can be helpful in some ways, like aiding in digestion and producing oxygen.
The correct answers to these statements are as follows:
- False. While some bacteria can cause disease, many are harmless or even beneficial to humans.
- False. Antibiotics are only effective against certain types of bacteria and are not effective against viruses.
- True. Bacteria are known to survive in extreme conditions, which makes them a fascinating subject of study for scientists.
- True. Bacteria play an essential role in various ecosystems and have many practical uses, such as in the production of food and medicine.
Overall, the Brainpop bacteria true or false worksheet is an excellent tool for students to test their knowledge and improve their understanding of bacteria. By answering these questions correctly, students can gain a better appreciation for the role that bacteria play in our lives and in the natural world.

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Note- The Question seems Incomplete, and complete question isn't available in the search engine.

Answer:

The answer is the atoms of the reactants have combined to form a new substance. Every product of a chemical equation has to be a new substance. If their is no new substance then, a chemical change never occurred and there is no chemical equation. The new substance never has the same properties as the reactants. That's why they call it a "new" substance. Also, the atoms are the ones that combine. They are not mixed

Carbon dioxide is considered to be a greenhouse gas because it absorbs and emits infrared radiation.

Greenhouse gases like carbon dioxide trap heat in the atmosphere, leading to the warming of the Earth's surface and atmosphere.Carbon dioxide is a greenhouse gas, meaning that it can absorb and emit infrared radiation. Carbon dioxide and other greenhouse gases in the atmosphere act as a type of insulation, trapping heat and keeping the Earth's surface and atmosphere warm.A greenhouse gas is a gas that can absorb and emit infrared radiation. The greenhouse effect occurs when certain gases, such as carbon dioxide and water vapor, trap heat in the Earth's atmosphere. As more greenhouse gases are released into the atmosphere, the Earth's temperature increases, leading to climate change.

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The statement that correctly describes the boiling point of alcohols is option D which is alcohol boiling point are higher than that of their parent molecules.

Boiling point of alcohol explained.

Alcohol is  indeed capable of forming hydrogen bonds which can significantly affect its boiling point. Hydrogen bonding occurs between the oxygen atom of one alcohol molecule and the hydrogen atom of another. These intermolecular forces are stronger than the typical London dispersion forces found in nonpolar molecules.

Due to the presence of hydrogen bonding, alcohols generally have higher boiling points compared to nonpolar compounds of similar molecular weight.

Compared to their parent molecules, alcohol have higher boiling points .

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