a student needs to prepare a 1h nmr sample for an organic compound soluble in chloroform (chcl3) . the student cannot use chcl3 as the solvent for the sample, but rather uses deuterated chloroform (cdcl3) because:

U has a total of six electrons. This corresponds to carbon (C). A is the second most common element in the atmosphere.

The second most common element in the atmosphere is oxygen (O). E is a noble gas.

Noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Based on the given options, E could be xenon (Xe).

S is an alkali metal.

Alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). Based on the given options, S could be sodium (Na).

O is a halogen.

Halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Based on the given options, O could be bromine (Br).

O has an atomic number larger than V but smaller than W.

Based on the periodic table, the atomic number of oxygen (O) is 8, which is larger than the atomic number of vanadium (V) (23) and smaller than the atomic number of tungsten (W) (74).

The charge on an L ion is +2.

The charge of +2 indicates that L must lose two electrons to form the ion. Based on the given options, L could be calcium (Ca).

C has five electrons in its outer energy fever.

Carbon (C) has four valence electrons, not five. This contradicts the given statement, so we need to revisit the deductions.

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An alloy is made of two or more different metals.These metals are of different sizes. This cause a distortion in the system and leads to a slide of of atoms when a force is applied and make it brittle.

Alloys are mixed metals. They are widely used in constructions, in electronic devices and in other industries due to their potential application superior over the pure metals.

There are atoms of various sizes in an alloy. The layers of atoms in pure metal are distorted by the smaller or larger atoms. This indicates that more force is needed to get the layers to slide over one another. Compared to pure metal, the alloy is tougher and more durable.

The irregularity of the atoms that make up high-entropy alloys is what gives is their immense strength. When the alloy is deformed, this disorder makes it difficult for the alloy's dislocation flaws to migrate through its crystal structure. But under adequate pressure, this also makes the alloy highly brittle.

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Answer:sodium, potassium, and chloride.

Explanation:just did it

Electrolytes are important minerals that carry an electric charge and play a crucial role in maintaining proper bodily functions. These minerals are found in both extracellular and intracellular fluids, and their concentration levels must be carefully balanced to ensure proper cell function.

When it comes to extracellular fluid, there are several electrolytes that are found in high concentrations. The three most important electrolytes that play a crucial role in extracellular fluid balance are sodium, chloride, and bicarbonate.

Sodium is an essential electrolyte that helps to maintain fluid balance in the body. It works by regulating the movement of water across cell membranes, helping to maintain the right amount of water both inside and outside of cells. Sodium also plays a key role in nerve and muscle function.

Chloride is another important electrolyte that is found in high concentrations in extracellular fluid. It works closely with sodium to regulate fluid balance and is also involved in the production of stomach acid, which aids in digestion.

Finally, bicarbonate is a key electrolyte that helps to regulate pH levels in the body. It works by buffering acids in the blood, helping to maintain a healthy pH balance. Bicarbonate is also involved in the production of digestive enzymes in the pancreas.

In conclusion, maintaining proper electrolyte balance is crucial for optimal health and wellbeing. Sodium, chloride, and bicarbonate are three essential electrolytes that are found in high concentrations in extracellular fluid and play an important role in maintaining proper cell function. By understanding the importance of these electrolytes, we can take steps to ensure that our bodies stay healthy and balanced.

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Answer:

This question is incomplete

Explanation:

The process described in which the solution absorbs thermal energy is referred to endothermic reaction. Endothermic reaction is a reaction that absorbs heat/thermal energy.

The other two processes mentioned will have to be determined based on the options provided. However, what appears to be the case, based on the construction of the question, is that the question describes types of saturation (saturated, unsaturated and supersaturated solutions).

Saturated solution: This is a solution that contains just the amount of solute that that the solvent can dissolve and any further addition of solute will leave the solute undissolved at the floor/base of the solution.

Unsaturated solution: This is a solution that contains less solute than the solvent can actually dissolves

Supersaturated solution: This is a solution that contains more solute than the solvent can dissolve, leaving the undissolved solute around the solution.

C. 0.5

This is the answer.

(assuming that the D option is 1, if it is 0.1 then the answer is 0.1)

\(0.5\)

Explanation:

As you know that decreasing in the concentration of OH- (i.e., 14, 13, 12, 11,..) makes to increase in the concentration of H+ ions (5,4,3,2,1).

In the reaction, A+ 3B -- > 2C + D the reaction is first order with respect to reactant A and second order with respect to reactant B. If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would be zero order by a factor of 1/2

The reaction given in the question is -

2A  + 3 B ---->  2C + D

From , the above reaction the rate law is written as -

rate = k [ A ]²[ B ]³

where ,

k = rate constant

In the above equation the order is determined by the sum of the powers of the concentrations , i.e. 2 + 3 = 5 order , which never possible ,

Hence , in the question ,

The by changing the concentration of B , the rate does not change .

hence , the rate is independent of the concentration of B .

Therefore ,

The order with respect to B will be zero .

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Answer:

The reaction can produce 287 grams of iron(II) carbonate

Explanation:

To solve this question we must find the moles of iron(II) chloride that react. Using the chemical equation we can find the moles of iron(II) carbonate and its mass -Molar mass FeCO3: 115.854g/mol-

Moles FeCl2:

1.24L * (2.00mol / L) = 2.48 moles FeCl2

As 1 mol FeCl2 produce 1 mol FeCO3, the moles of FeCO3 = 2.48 moles

Mass FeCO3:

2.48mol * (115.854g / mol) =

Answer:

287

Explanation:

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

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Answer: Unused glucose is stored mainly in the liver as glycogen.

Explanation: The body breaks down most carbohydrates from the foods we eat and converts them to a type of sugar called glucose. Glucose is the main source of fuel for our cells. When the body doesn't need to use glucose for energy, it stores it in the liver and muscles. This stored form of glucose is made up of many connected glucose molecules and is called glycogen. When the body needs a quick boost of energy or when the body isn't getting glucose from food, glycogen is broken down to release glucose into the bloodstream to be used as fuel for the cells.

When the body doesn't need to use glucose for energy, it stores it in the liver and muscles.

The compound CaS consists of the ions Ca²⁺ and S²⁻.

In the compound CaS, calcium (Ca) and sulfur (S) combine to form an ionic compound. Calcium, with a valence of +2, loses two electrons to attain a stable electron configuration, resulting in the formation of the Ca²⁺ ion. Sulfur, on the other hand, has a valence of -2, meaning it gains two electrons to achieve a stable electron configuration, forming the S²⁻ ion.

The ionic bond is formed through the attraction between the positively charged Ca²⁺ ion and the negatively charged S²⁻ ion.

This results in the formation of the compound CaS, where the Ca²⁺ and S²⁻ ions are held together by electrostatic forces. It is important to note that in an ionic compound, the total positive charge of the cations (Ca²⁺) balances the total negative charge of the anions (S²⁻) to maintain overall charge neutrality.

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Answer:

+4

Explanation:

In PbO2, oxygen exhibits an oxidation number of -2 (since it's not a peroxide or superoxide):

Let the oxidation number of Pb be x. Then, for the compound to be neutral, the oxidation numbers of all atoms should add up to zero.

⇒ x + (−2) + (−2) = 0

x = +4

So the oxidation no. of Pb is +4.

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Answer:

1 + (2+3+2)×3

1+7×3

1+21

22

Explanation:

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Answer: 1 + 6 + 9 + 6 = 22

Explanation:

al = 1

c = 6

h = 9

o = 6

180°: Linear, VSEPR number 2

107°: Trigonal bipyramidal, VSEPR number 5

120°: Trigonal planar, VSEPR number 3

Molecular geometry refers to the three-dimensional arrangement of atoms in a molecule. It determines the shape of the molecule and the relative positions of its atoms in space. The molecular geometry is determined by the number of atoms and the types of bonds between them.

The concept of molecular geometry is important in chemistry because it determines the physical and chemical properties of the molecule, such as its reactivity, polarity, and biological activity.

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Answer:

A

Explanation:

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Answer:

D

Explanation:

All about the motion.

Gentian violet, a dye used in DNA gel electrophoresis, exhibits a yellow color in strongly acidic solutions and turns purple in solutions with higher pH levels, such as neutral or basic solutions. This color change aids in the visualization of DNA fragments during the gel electrophoresis process.

Gentian violet is a common dye used in DNA gel electrophoresis to stain DNA bands. It is a cationic dye that binds to DNA molecules, making them visible under UV light. Gentian violet appears yellow in strongly acidic solutions and purple in solutions with a higher pH. During electrophoresis, the DNA is separated by size and charge, resulting in distinct bands on the gel. Gentian violet stains these bands, allowing scientists to visualize the DNA fragments. However, excessive use of gentian violet can damage DNA, so it is important to use it in moderation. In summary, gentian violet is a vital tool for DNA analysis, but its use must be carefully controlled to prevent any negative effects on the DNA samples.
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Given what we know, we can confirm that the concentration of salt outside the cell was above 10%.

This has to do with osmosis. Osmosis is the tendency of water to move towards a place with a higher concentration of solute. This is because of water's role as a solvent. The cell in this case shrinks because the water leaves the cell to dissolve the outside salt concentration, which tells us that it must be higher than 10%.

Therefore, we can confirm that the cell shrinks because water leaves the cell to dissolve the outside salt concentration, meaning that the outside concentration of salt is higher than 10%.

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Alkenes' sp2 hybridized carbon atoms are linked to alkyl groups, which have an impact on the stability of double bonds.

The diverse alkyl groups that are attached to the sp2 hybridized carbon atoms frequently have an impact on the chemical reactivity of alkenes as well. As a result, categorizing alkenes according to the number of alkyl groups connected to the C=C structural unit is particularly helpful. The degree of substitution is the term for this characteristic.

A monosubstituted alkene has a single alkyl group linked to the double bond's sp2 hybridized carbon atom. A terminal alkene is a type of alkene that has its double bond at the end of the chain of carbon atoms. Alkenes that have two, three, or four alkyl groups attached to the double bond's carbon atoms are di-, tri-, or tetra substituted, respectively.

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Answer:

protons=35 neutrons=44.9 electrons=35

Explanation:

Assuming the same cost structure, a competitive market produces greater output at lower prices than a monopoly market.

Assuming the same cost structure, a competitive market produces greater output at lower prices than a monopoly market. This is because competitive markets have multiple firms competing, leading to increased efficiency and lower prices for consumers, while a monopoly has a single firm dominating the market, allowing it to set higher prices without fear of competition.

In a competitive market, numerous businesses are active and in direct competition with one another. Offering products or services at competitive prices helps any business achieve its goal of maximising earnings. Multiple enterprises provide rivalry, which lowers prices and motivates businesses to raise their output in order to gain a bigger piece of the market. The market's overall output is higher as a result.

On the other hand, in a monopoly market, the entire market is controlled by a single dominant enterprise. Due to the absence of other businesses, the monopoly firm has the authority to set prices higher than what would be typical in a market with competitors. Since it has no direct competitors, the monopoly corporation can limit output to increase profits.

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They form a new compound with new properties from the original element.

The same components are always present in the same ratios in a compound. Compounds' characteristics differ, sometimes significantly, from the characteristics of the constituent . This is due to the fact that when elements in such a compound combine, a whole new substance with distinct features results.

A compound contains special characteristics that set it apart from the characteristics of its basic elements.

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Answer:

The chromium found in foods will not hurt you. But taking excessive chromium supplements can lead to stomach problems and low blood sugar (hypoglycemia). Too much chromium from supplements can also damage the liver, kidneys, and nerves, and it may cause irregular heart rhythm.

Answer:

The answer is B.  A river is a body of water, therefore, there will always be some water running over the rock.

Answer:

The answer is: B

Explanation:

The reason for this is because when a rock is underwater (the river, in this case), the water runs across it non-stop until the rock is removed from the water. The only way it can be polished if it is submerged under the water for quite some time (years and years).

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The diagram shows the stages jamila uses to make zinc sulfate and the stages in the correct order include the following below:

This is referred to as a process used to separate solids from liquids or gases using a filter medium.

In the formation of zinc sulfate, the zinc is usually added to concentrated H₂SO₄ and filtered with the use of filter paper through several techniques to ensure that the filtrate is dry and concentrated.

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Answer:

3.8

Explanation:

At body temperature, the amount of energy required to evaporate a substance depends on the substance itself.

Different substances have different heat of vaporization, which is the amount of energy required to change a unit mass of a substance from a liquid to a gas at constant temperature and pressure. For example, the heat of vaporization of water at body temperature is approximately 40.7 kJ/mol or 2260 J/g. This means that to evaporate one gram of water at body temperature, approximately 2260 joules of energy would be required. Without knowing the substance in question, it is difficult to determine the mass or quantity of a substance that requires 2404 J of energy to evaporate at body temperature. However, it is possible to calculate the amount of energy required to evaporate a given quantity of a substance at a specific temperature using the substance's heat of vaporization.

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Answer:

150cm3

Explanation:

Volume=Length x Width x Height

3cm x 5cm x 10cm= 150cm3

Answer:

Joule

Explanation:

This is the answer

Benzophenone dissolves in methanol because it forms intermolecular hydrogen bonds with the methanol molecules.

Methanol is a polar solvent, meaning it has a positive and negative end. Benzophenone is also polar, with the carbonyl group (C=O) being the most polar part of the molecule. The oxygen atom in the carbonyl group has a partial negative charge, and the hydrogen atoms in the methanol molecule have a partial positive charge.

This allows for the formation of intermolecular hydrogen bonds between the benzophenone and methanol molecules. These hydrogen bonds increase the solubility of benzophenone in methanol, allowing it to dissolve.

In summary, benzophenone dissolves in methanol due to the formation of intermolecular hydrogen bonds between the polar molecules.

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Water and carbon dioxide are the byproducts of hydrocarbon burning.

A mixture of hydrocarbon is called a hydrocarbon. The hydrocarbons methane (CH4), ethane (C2H6), and ethyne are examples of (C2H2). These compounds are all hydrocarbons since their corresponding molecular formulas show that they are all solely composed of the elements hydrogen and carbon.

The biggest and most intricate carbon molecules are found in coal. Various hydrocarbons produce different amounts of water and carbon dioxide because their hydrogen to carbon ratios vary. The ratio of charcoal to hydrogen is typically higher in longer, more complicated molecules.

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