Indicate which compounds present i) in the reactants and ii) in the products from this lab experiment could be expected to give positive tests with a) permanganate and b) ceric ammonium nitrate. Reactants: "fresh aqueous aspartame" hydrolyzed aspartame "beverage A," which is a diet soft drink 24% aqueous methanol distilled water products: -the result of: 30 mL of aspartame stock solution, 10 drops of 6M NaOH in a flask and heated gently for 60 minutes on a steam bath -the result of: 10mL of diet soft drink with 10 drops of 95% ethanol

The correct matches are:

(i) Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules.

(ii) 1º and 2º amides experience primarily hydrogen bonding between their molecules.

(iii) Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape.

(iv) 1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape.

i.

Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules due to the presence of polar bonds within the molecules.

ii.

1º and 2º amides experience primarily hydrogen bonding between their molecules, as they contain the necessary hydrogen and oxygen or nitrogen atoms for hydrogen bonding.

iii.

Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape. This is due to the absence of hydrogen bonding in these compounds, resulting in weaker intermolecular forces.

iv.

1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape. This is because they can form extensive hydrogen bonding between their molecules, leading to stronger intermolecular forces and higher boiling points.

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Answer:

steam and methane

Explanation:

Answer: B. Fire is releasing energy

Explanation:

Answer:

A catalyst

Catalysts speed up the rate of reaction without being changed or used up in the reaction.

Hope this helps!

Answer:

Physical

Explanation:

The change of density alone is a physical change, but there might be some chemical change that results in physical change. For example: Burning a piece of paper will definitely change the density of the paper as some of its content is being changed into smoke which is a gas. So there will be a change in volume which in turn leads to change in density. Therefore, the change of density alone is a physical change, but the change might occur due to another chemical change.

#Please mark my answer as brainliest#

A molecule refers to a basic unit of a substance that is composed of two or more atoms bonded together, while a compound refers to a substance made up of two or more different elements chemically combined in a fixed ratio.

A molecule is a basic unit of a chemical substance that consists of two or more atoms bonded together. It is the smallest particle of a substance that retains the chemical properties of the substance. A molecule can be composed of elements of the same type (such as O2, a molecule of oxygen), or elements of different types (such as H2O, a molecule of water).

A compound, on the other hand, is a substance made up of two or more different elements combined chemically in a fixed ratio. The elements in a compound are combined through chemical bonds, forming a new substance with unique properties that are different from those of the individual elements. In other words, a compound is a type of molecule that is composed of elements from two or more different types.

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Answer:

I think it is true, but I am not to sure.

Answer:

True

Explanation:

Tornadoes are far and away the most dangerous storms in terms of deaths and injuries by an order of magnitude. Hurricanes, typhoons, and storm surges cause the most property damage, droughts and floods cause the most crop damage

Based on the lab values provided, the answer would be D. The patient has been immunized against hepatitis B as indicated by the presence of HBsAB.

The absence of HBsAg and HBcAb suggest that the patient has not had a recent or current infection with hepatitis B. It is important to note that these lab values should be interpreted by a health care provider in the context of the patient's medical history and any additional lab or clinical findings.

HBcAb (-) means the patient does not have antibodies for the hepatitis B core antigen, suggesting no past infection. These results suggest that the patient has been immunized against hepatitis B.

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Interpreting these lab values for a 40-year-old patient with the given terms:

HBsAg (-), HBsAB(+), HBcAb(-)

a. the pt had hepatitis
b. the pt has hepatitis
c. the pt should consider immunization
d. the pt has been immunized

Your answer: d. the pt has been immunized.

HBsAg (Hepatitis B surface antigen) is negative, which indicates the patient does not have an active Hepatitis B infection.
HBsAB (Hepatitis B surface antibody) is positive, which suggests that the patient has developed immunity to Hepatitis B, either from previous exposure or immunization.
HBcAb (Hepatitis B core antibody) is negative, which means the patient has never been exposed to Hepatitis B.

Therefore, the interpretation of these lab values suggests that the patient has been immunized against Hepatitis B.

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Answer:

Alkalis form chemical salts when they are combined with acids. e.g Sodium hydroxide  ,Potassium hydroxide  and Ammonia

Explanation:

Answer:

a substance which is alkali is a base that is soluble in water.an example is sodium hydroxide.

Answer:

How did John D Rockefeller make his fortune? Rockefeller founded the Standard Oil Company in 1870. He ran it until 1897, and remained its largest shareholder.

Answer:

oil

Explanation:

There are enzymes that interact with one enantiomer but not the other is incorrect. The interaction of some enzymes with one enantiomer but not the other.

Enzymes are proteins that are capable of lowering the activation energy and speeding up or slowing down a chemical reaction. It means that enzymes do not alter the energy of the reactants and products of the reaction; they only affect the activation energy. The enzymes are not consumed during the reaction in which they are involved, and they remain the same after the reaction.

Therefore, they can be used over and over again to catalyze the same reaction. Enzymes are stereospecific, meaning they can interact with specific stereoisomers of a compound. There are enzymes that interact with one enantiomer but not the other, which is incorrect because enzymes interact with specific enantiomers of a compound. Enzymes are stereospecific, meaning they can interact with specific stereoisomers of a compound.

The incorrect statement about enzymes is option D. There are enzymes that interact with one enantiomer but not the other. Enzymes are not consumed during a reaction, and they are proteins that can speed up or slow down chemical reactions by lowering the activation energy.

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Answer:

Explanation:

In first picture,

When rock was not in the cylinder,

Volume of water

\( = {18cm}^{3} \)

In second picture,

When rock is in the cylinder,

Volume of water

\( = {36cm}^{3} \)

Hence,

Volume of rock

\( = 36 {cm}^{3} - {18cm}^{3} \)

\( = 18 {cm}^{3} (ans)\)

For each combination, we can determine whether it can be a buffer or not: Weak acid and its conjugate base, Weak base and its conjugate acid can be buffer, Strong acid and strong base, Weak acid and strong base, Weak base and strong acid can not be a buffer.

Weak acid and its conjugate base: This combination can be a buffer, as it contains a weak acid and its corresponding conjugate base. When a strong acid is added to the solution, the conjugate base will react with the acid to form the weak acid, thus minimizing the change in pH.

Weak base and its conjugate acid: This combination can also be a buffer, as it contains a weak base and its corresponding conjugate acid. When a strong base is added to the solution, the conjugate acid will react with the base to form the weak base, minimizing the change in pH.

Strong acid and strong base: This combination cannot be a buffer, as it does not contain a weak acid or a weak base. When a strong acid or strong base is added to the solution, it will completely ionize and cause a large change in pH.

Weak acid and strong base: This combination cannot be a buffer, as the weak acid will be completely consumed by the strong base, resulting in the formation of the conjugate base and a large change in pH.

Weak base and strong acid: This combination also cannot be a buffer, as the weak base will be completely consumed by the strong acid, resulting in the formation of the conjugate acid and a large change in pH.

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False.

Radiation itself does not typically have a green glow, intense heat, crackling sound, or ammonia smell. These descriptions do not accurately represent the properties of radiation.

The emission of energy in the form of particles or electromagnetic waves is referred to as radiation. Our senses cannot immediately notice it. Radiation is measured and detected using specialized apparatus and detectors.

Alpha particles, beta particles, gamma rays, and X-rays are a few examples of different forms of radiation that have unique characteristics and may be identified with the right tools. For instance, ionizing radiation is typically detected using Geiger-Muller counters or scintillation detectors, whereas radiation exposure is measured using dosimeters.

For precise radiation risk identification and protection, it's crucial to rely on the right detection tools and follow safety procedures.

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The approximate pH at the equivalence point of a weak acid-strong base titration if 25 ml of aqueous hydrofluoric acid requires 30.00 ml of 0.400 m NaOH is 0.66.

We must first figure out how many moles of NaOH were supplied to achieve the equivalence point in a weak acid-strong base titration before we can determine the pH there.

Molarity times volume is 0.400 mol/L times 0.03000 L, or 0.0120 mol of NaOH.

NaOH and HF have a 1:1 stoichiometric ratio, therefore 0.0120 mol of HF is also how many moles were in the initial solution.

We can now calculate HF's Ka using the equilibrium formula for HF:

Ka = [HF][H+][F-]

All of the HF's reactions with the NaOH at the equivalence point have produced water and NaF.

The pH at the equivalency point is as a result:

pH is almost equal to -log[H+] = -log (0.220) = 0.66 (to two significant figures).

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the actual quantity of nitrogen, phosphorus, and potassium guaranteed to be applied to the maize field is 50 kg, 50 kg, and 25 kg, respectively.

For Nitrogen (N):

The percentage of nitrogen in the fertilizer is 20%. Therefore, the amount of nitrogen applied can be calculated as:

Nitrogen = (20/100) * 250 kg

Nitrogen = 0.2 * 250 kg

Nitrogen = 50 kg

For Phosphorus (P):

The percentage of phosphorus in the fertilizer is also 20%. Thus, the amount of phosphorus applied can be calculated as:

Phosphorus = (20/100) * 250 kg

Phosphorus = 0.2 * 250 kg

Phosphorus = 50 kg

For Potassium (K):

The percentage of potassium in the fertilizer is 10%. So, the amount of potassium applied can be determined as:

Potassium = (10/100) * 250 kg

Potassium = 0.1 * 250 kg

Potassium = 25 kg

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Prior to giving nitroglycerin, an additional diagnostic test that is often indicated is an electrocardiogram (ECG/EKG).

An electrocardiogram (ECG or EKG) is a diagnostic test that measures the electrical activity of the heart. It is a non-invasive procedure that involves attaching electrodes to the patient's chest, arms, and legs to detect and record the electrical signals produced by the heart.

During an ECG, the electrodes detect the electrical impulses generated by the heart's natural pacemaker, the sinoatrial (SA) node, and the subsequent conduction of these impulses through the heart. The electrical activity is then recorded as a series of waveforms on a graph, which can be interpreted by a healthcare professional.

The ECG provides valuable information about the heart's rhythm, rate, and overall electrical conduction. It helps in diagnosing various cardiac conditions, including abnormal heart rhythms (arrhythmias), heart attacks (myocardial infarction), ischemia (lack of blood flow to the heart), and structural abnormalities.

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The aqueous solutions has the highest boiling point is 0.1M BaCl₂ because it dissociates into three ions in solution, which is the highest number of ions. Option C is correct.

The boiling point of a solution is directly related to the concentration of solute particles in the solution. A solution having a higher concentration of solute particles will have a higher boiling point.

Out of the given options, BaCl₂ dissociates into three ions (Ba²⁺, 2Cl⁻) in solution, K₂SO₄ dissociates into three ions (2K⁺, SO₄²⁻) in solution, Na₃PO₄ dissociates into four ions (3Na⁺, PO₄³⁻) in solution, and KNO3 dissociates into two ions (K⁺ NO₃⁻) in solution.

Therefore, the aqueous solution with the highest boiling point will be the one that dissociates into the most number of ions i.e 0.1M BaCl₂.

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Benzene will release the greatest amount of heat when 1.00 mol of it is dissolved.

Molar Heat of Fusion and Melting Point for Selected Substances.The molar heat of fusion of a substance is the quantity of heat needed to melt one mole of it at its melting point. The quantity of heat discharged when 1.00 mol of a substance is dissolved is referred to as the molar heat of fusion. The unit of measurement for molar heat of fusion is kJ/mol.The following is a list of the melting points and molar heat of fusion for the given substances.Argon Melting Point: -189.4°C Molar Heat of Fusion: 1.18 kJ/molBenzene Melting Point: 5.5°C Molar Heat of Fusion: 9.87 kJ/molMercury Melting Point: -38.8°C Molar Heat of Fusion: 2.29 kJ/molWater Melting Point: 0°C Molar Heat of Fusion: 6.01 kJ/molThe quantity of heat released when 1.00 mol of each substance is dissolved is the molar heat of fusion. The substance with the highest molar heat of fusion would release the greatest amount of heat when 1.00 mol of it is dissolved.Benzene has the highest molar heat of fusion of the four substances, with a value of 9.87 kJ/mol.

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Answer:

they change the object hehehehe

Answer:

D. Perform repeated trials.

Explanation:

I did the exam and got it correct :D!

When lithium sulfate reacts with water, lithium hydroxide, and hydrogen sulfate will be resulted. The coefficients will be 1,2,2,1. Thus, option A is correct.

The balanced equation for the reaction between lithium sulfate and water, forming lithium hydroxide and hydrogen sulfate can be written as:

\(Li_2SO_4 + 2H_2O - > 2LiOH + H_2SO_4\)

This equation will be known as a displacement reaction because the sulfate ions exchange the position from lithium ions and form sulfate ions to form water.

1 molecule of Lithium sulfate and molecules of water react to form 2 molecules of Lithium-Hydroxide and Hydrogen-Sulphate replacing positions. Therefore the coefficients of this balanced equation are 1,2,2,1.

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We need to add 0.148 moles of sodium hydroxide to 150 ml of a 0.387 M hydrocyanic acid solution to prepare a buffer with a pH of 9.170.

To prepare a buffer with a pH of 9.170, we need to find the pKa of hydrocyanic acid. The pKa of hydrocyanic acid is 9.21.

Using the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

We can rearrange this equation to solve for [A-]/[HA]:

[A-]/[HA] = 10^(pH-pKa)

[A-]/[HA] = 10^(9.170-9.21)

[A-]/[HA] = 0.524

Now, we need to determine the concentrations of the acid and its conjugate base in the buffer. Let x be the number of moles of sodium hydroxide needed to neutralize the acid:

Initial concentration of hydrocyanic acid: 0.387 M

Concentration of hydrocyanic acid after addition of NaOH: (0.387 - x) M

Concentration of cyanide ion after addition of NaOH: x / 0.150 L = 6.67 x M

Using the equation for the buffer concentration ratio:

0.524 = (6.67 x) / (0.387 - x)

Solving for x:

x = 0.148 moles of NaOH

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Answer:

\(MgI_{2}\)

Explanation:

To write the correct formula for magnesium iodide, we can use the periodic table to see how many valence electrons they will lose/gain. Since Magnesium will lose two electrons and Iodine will gain 1 electron, you need two Iodine for every Magnesium ion. Therefore, the formula is      \(MgI_{2}\).

In addition to the name of the chemical and any special warnings, there are several other important pieces of information that should be included on the label of stock solutions prepared in the lab. These include:

1. Concentration: The concentration of the stock solution should be clearly indicated. This can be expressed as molarity (M), percentage (%), or other appropriate units.

2. Date of Preparation: It is important to include the date when the stock solution was prepared. This helps in tracking the age and shelf life of the solution.

3. Storage Conditions: The recommended storage conditions should be provided, such as temperature, light sensitivity, or any other specific requirements to maintain the stability and integrity of the solution.

4. Hazard Symbols or Codes: If the chemical is hazardous, it is important to include the appropriate hazard symbols or codes, such as GHS (Globally Harmonized System) pictograms, to indicate the potential risks associated with the solution.

5. Safety Precautions: Any necessary safety precautions or handling instructions should be clearly stated, including the use of personal protective equipment (PPE), ventilation requirements, and handling procedures.

6. Batch or Lot Number: If applicable, a batch or lot number can be included to help with traceability and quality control.

It is essential to ensure that all information on the label is accurate, up-to-date, and compliant with local regulations and safety standards. Properly labeled stock solutions help to minimize the risks associated with handling and using chemicals in the laboratory.

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The solutes in an aqueous solution of KF in order of increasing concentration are : Lowest concentration: K+ (aq),H+ (aq),OH- (aq),F- (aq),Highest concentration: HF (aq)

In an aqueous solution of KF, K+ ions come from the dissociation of KF, but KF is a strong electrolyte and dissociates almost completely, so the concentration of K+ ions is relatively high. H+ ions are present in water due to the self-ionization of water, but their concentration is relatively low. OH- ions are also present due to the self-ionization of water, but their concentration is lower than that of H+ ions. F- ions come from the dissociation of KF, so their concentration is higher than that of OH- ions. HF is a weak acid that partially dissociates in water, resulting in a higher concentration of HF compared to the other ions in the solution.

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Answer:

283.5g

Explanation:

first u need to know the molar mass of hno3 which is 63.01

the g=1.5×3×63.01

g= 283.5

Compared to other common sugars, The sweetest-tasting simple carbohydrate in the diet is fructose

A naturally occurring sugar called fructose can be found in a variety of fruits, vegetables, and honey.

Compared to other common sugars like glucose and sucrose (table sugar), it is sweeter.

Fructose is quickly absorbed into the bloodstream after consumption and can serve as a quick source of energy.

Due to its extreme sweetness, it is frequently employed as a sweetener in many processed foods and beverages.

High-fructose corn syrup is a commercial sweetener with a considerable fructose content that is frequently used in sodas and other sweetened beverages.

Therefore, fructose is the sweetest simple carbohydrate.

Option C) fructose is the correct answer.

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Answer:

A chemical formula tells us the number of atoms of each element in a compound.

Explanation:

Explanation:

formula shows

Answer to the question : D.                                                            

Answer:

my answer is C. having mass and taking space