How might a scientist confirm the results of other expirements by doing an experiment

When water (H2O) is added to liquid isopropanol to form a solution, then polar isopropanol molecules are attracted to polar water molecules at the surface of the water. It forms a solution of rubbing alcohol.

Isopropyl alcohol is water-soluble and forms hydrogen bonds with molecules of water (H2O).

When H2O is added to liquid isopropanol to form a solution, H2O spread in a uniform way in the solution.

These isopropanol molecules can surround H2O molecules, which are carried into the solution.

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Answer:

1
4
3
2

Explanation:

The group of chemical element which an atom from group 2A forms an ionic bond with is most likely from group 7A

An ionic bond can formed between calcium from from group 2A and fluorine from group 7A to form calcium fluoride. In order words, Calcium fluoride is an ionic chemical compound which is insoluble in water. Calcium fluoride is composed of calcium ion and fluoride ion.

In conclusion, it can be deduced from the explanation given above that calcium fluoride is an ionic compound.

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Answer:

Uranium is radioactive

Explanation:

just took the quiz

Answer:

The answer is option OB.

Answer: B) carbon + oxygen - carbon dioxide

Explanation: The symmetry of a carbon dioxide molecule is linear and centrosymmetric at its equilibrium geometry. The length of the carbon-oxygen bond in carbon dioxide is 116.3 pm, noticeably shorter than the roughly 140-pm length of a typical single C–O bond, and shorter than most other C–O multiply-bonded functional groups such as carbonyls. Since it is centrosymmetric, the molecule has no electric dipole moment. As a linear triatomic molecule, CO2 has four vibrational modes as shown in the diagram. In the symmetric and the antisymmetric stretching modes, the atoms move along the axis of the molecule. There are two bending modes, which are degenerate, meaning that they have the same frequency and same energy, because of the symmetry of the molecule. When a molecule touches a surface or touches another molecule, the two bending modes can differ in frequency because the interaction is different for the two modes. Some of the vibrational modes are observed in the infrared (IR) spectrum: the antisymmetric stretching mode at wavenumber 2349 cm−1 (wavelength 4.25 μm) and the degenerate pair of bending modes at 667 cm−1 (wavelength 15 μm). The symmetric stretching mode does not create an electric dipole so is not observed in IR spectroscopy, but it is detected in by Raman spectroscopy at 1388 cm−1 (wavelength 7.2 μm).

The pressure inside the container, under constant temperature, is approximately 68.33 kPa when the volume expands to 12.0 L.

If the temperature remains constant, the pressure of the gas in the container can be calculated using Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.

According to Boyle's Law, the initial pressure multiplied by the initial volume is equal to the final pressure multiplied by the final volume. Therefore, (205 kPa) × (4.0 L) = (final pressure) × (12.0 L).

To find the final pressure, we rearrange the equation and solve for the unknown: (205 kPa) × (4.0 L) / (12.0 L) = final pressure.

Calculating the expression gives us a final pressure of approximately 68.33 kPa. Therefore, the pressure in the container, when the volume expands to 12.0 L while keeping the temperature constant, is approximately 68.33 kPa.

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Answer:

I'm sure it's Dispersion

Explanation:

Answer: OB. Secondary Sectors.

Explanation: Make sure to study as the text provided, and study guide state manufacturers, butchers, and factory employees are apart of the secondary sector in the world economy. You’ll do great on Quiz 3.2.5! Make sure to study, have a g’day. Please don’t listen to people who say this answer is falsen as many other questions do, don’t be the one to spread false information as this people’s academics, here’s a picture as well ❤︎. Again, its B!

The strength of steel increases with an increase in carbon content. The more carbon that is dissolved in iron, the less it will corrode and the stronger it will become. In general, the increase in carbon percentage increases tensile strength but reduces ductility and toughness.

Higher carbon content lowers steel's melting point and its temperature resistance, but increases its hardness and strength. Carbon also helps to reduce the size of iron crystals, which affects their physical characteristics by making them stronger and harder. The percentage of elongation will decrease as carbon content increases.

The reduction in percentage elongation is due to the fact that increasing carbon content causes steel to harden, which leads to a reduction in ductility. In general, steel with low carbon content has high ductility and elongation, while steel with high carbon content has low ductility and elongation.

As the carbon content increases, the percentage area reduction also decreases. This is because an increase in carbon content makes steel more brittle, which reduces its ability to deform without cracking. Carbon has a significant effect on the ductility of steel, reducing it as carbon content increases. As the carbon content increases, the steel becomes more brittle, making it more likely to crack or break under stress.

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C. If  blood pressure decreases, filtration in the kidneys decreases.

D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises blood pressure.

The maintenance of blood pressure is defined as the high use of sodium in your diet and the low use of potassium in your diet can cause hypertension. It is also important to use those foods which are free from fats. It is also important that we should use fruits, vegetables, and grains in excessive amounts for the maintenance of blood pressure and for a healthy diet.

High blood pressure 190/110 mm Hg can cause the main vital organs of the body like the brain, heart, and kidney too. There are three factors that contribute to blood pressure which are resistance, blood viscosity, and blood vessel diameter.

So we can conclude that blood pressure is the pressure of circulating blood against the walls of the blood vessels.

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Which of the following statements are true of the maintenance

of blood pressure (BP)? (Read carefully and select all of the correct statements.)

A. Norepinephrine stimulates vasoconstriction in skin, viscera, and skeletal muscles, all of which lower BP.

B. Aldosterone stimulates the reabsorption of Na+ ions by the kidneys, which lowers BP.

C. If BP decreases, filtration in the kidneys decreases.

D. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises BP.

E. If BP decreases, the kidneys secrete the enzyme renin, which stimulates the secretion of epinephrine to prevent a further decrease.

F. The hormone ANP increases the excretion of K+ ions by the kidneys, which helps conserve water and raise BP.

G. The hormone ADH helps the kidneys conserve water and helps prevent a decrease in BP.

H. The elasticity of the large arteries helps decrease diastolic BP.

Answer:

a because two substances form a new substance

Explanation:

Answer:

A is the chemical reaction because  we can see rearrangement of the ionic structure of a substance, new bonds are forming up that results in the change in physical and chemical properties

Answer:

Option A

Explanation:

As we know  

Percent yield is the ratio of actual yield/theoretical yield

a) Percent yield  - Theoretical yield 52.3 g; actual yield 50.7g = 0.97 = 97%

b) Percent Yield - Theoretical yield 17.1 g; actual yield 15.7g = 92%

c) Percent Yield - Theoretical yield 38.8 g; actual yield 36.2 g = 93%

d) Percent Yield - Theoretical yield 24.6 g; actual yield 22.5 g = 91%

Hence option A is correct

Answer:

In a bottle.

Explanation:

I would like soda in a bottle because you don't get soda stuck in the aluminum can like you do a bottle. And it's also way more efficient because bottles have caps that you can screw on later, but aluminum doesn't.

Answer:

Your answer should be D

The theory of traits of a population change over time explains how people can change with respect to the  strength and intensity of basic trait dimensions.

Trait theory in psychology serves as the thorry that focus on the  idea that people differ  whichg can be attributed to their strength  as well as  intensity of basic trait dimensions.

It shouuld be noted that the criteria that characterize personality traits involves the act of consistency as well as  stability,  along with  individual differences.  Natural selection  give us the underswtandng of how genetic traits of a species undergo change over time.

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Answer:

a

Explanation:

Answer:

A

Explanation:

Periodic table is divided into three metals, non metals and metalloids. The non metals are kept on the right side of the periodic table. Th correct option is option D.

Non metals are the element that have property to gain electron. When any element gain electron then element attain negative charge and that element is called anion. The examples of non metals are Oxygen, nitrogen, carbon, Fluorine etc.

The properties of non metals are

Non metals are soft.

Non metals are not malleable that is they can be broken into thin sheets.

Non metals are not ductile they can not be broken into thin wires.

Non metals are brittle in nature that is they can be broken down easily.

Non metals are not lustrous.

In metals, reactivity increases down a group, and in non-metals reactivity increases up a group.

Therefore the correct option is option D.

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Answer:

d

Explanation:

same question

Answer:

6.82 Mol CO2

Explanation:

Answer:

False

Explanation:

Solubility refers to the ability of a substance to dissolve in a solvent, usually a liquid. It is a measure of the amount of a substance that can dissolve in a given amount of solvent at a given temperature. Solubility is not related to the ability of a substance to burn.

Option A displays the accurate dimensional analysis for converting 14,612 mL to daL.

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Answer:

malleable

Explanation:

The image represent in malleable property of metal.

The image possibly represents the photoelectric effect of a metal, which is when it emits electrons after being exposed to electromagnetic radiation. Metals are also characterized by physical properties such as conductivity, malleability, metallic luster, and metallic bonding.

Based on your question, the image possibly represents the photoelectric effect, a key property of metals. This phenomenon occurs when a metal surface exposed to electromagnetic waves of a certain frequency absorbs radiation and emits electrons. These emitted electrons are called photoelectrons. Metals can also exhibit free electron model behavior, where electrons freely roam within the metal structure.

Metals possess unique physical properties like conductivity, malleability, and metallic luster. Malleability refers to the metal's ability to deform without breaking, while conductivity refers to the metal's ability to transfer heat or electricity. A metallic luster gives metals their characteristic shiny appearance.

Finally, metals are also known for their metallic bonding—a unique force that holds together the atoms within a metallic solid. Metallic bonding gives rise to many useful and varied bulk properties of metals.

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Answer:

ΔH = -110.5kJ

Explanation:

It is possible to obtain enthalpy of combustion of a particular reaction by the algebraic sum of similar reactions (Hess's law). Using:

1. C(s) + O₂(g) → CO₂(g) ΔH₁ = -393.5kJ

2. CO(g) + 1/2O₂(g) → CO₂(g) ΔH₂ = -283.0kJ

The sum of 1 -2 gives:

C(s) + O₂(g) + CO₂(g) → CO₂(g) + CO(g) + 1/2O₂(g)

C(s) + 1/2O₂(g) → CO(g) ΔH = -393.5kJ - (-283.0kJ) =

The lipids that have two long hydrocarbon chains linked by an ester group are called phospholipids. Phospholipids are essential components of cell membranes as they form a bilayer structure, with the hydrophobic tails facing inward and the hydrophilic heads facing outward.

This arrangement provides a barrier that regulates the passage of substances into and out of the cell. In contrast, waxes have long hydrocarbon chains linked by a different type of bond, and they are primarily used for waterproofing and protection.

Steroids have a distinct structure with four rings of carbon atoms and are involved in a variety of physiological processes, including hormone regulation.

Triglycerides, on the other hand, have three long hydrocarbon chains linked to a glycerol molecule and are used for energy storage.

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Answer: D) Sodium Chloride is dense, soluble in water, brittle, ionic lattice, high melting point.

The best option to be a recrystallization solvent for sodium benzoate is water. Recrystallization is a purification technique that involves dissolving an impure sample in a solvent and then allowing the solute to slowly crystallize out of the solution under controlled conditions. The pure crystals can be separated from the remaining liquid through filtration.

The most effective solvent for recrystallization is one in which the compound is only slightly soluble at low temperatures but very soluble at high temperatures. By dissolving the compound in a hot solvent and then allowing the solvent to cool, the compound will slowly crystallize out of the solution while any impurities remain dissolved. These impurities are then removed by filtration.

Benzene is no longer used as a solvent because of its toxicity. Ethanol is not the best solvent for recrystallizing sodium benzoate, as it does not have a large enough temperature range to allow for sufficient crystallization and purity. Hexane is non-polar, whereas sodium benzoate is polar, making it ineffective as a solvent for recrystallization. Therefore, the best option to be a recrystallization solvent for sodium benzoate is water.

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Monodeuteriocyclopentane (C5H9D) can be prepared from Bromocyclopentane (C5H9Br) using an organometallic reagent such as lithium aluminum deuteride (LiAlD4).

The reaction can be summarized as follows:

Step 1: Formation of Organolithium reagent

React Lithium metal (Li) with deuterium gas (D2) in anhydrous ether (Et2O) to form Lithium Deuteride (LiD).

2 Li + D2 → 2 LiD

Then, react Lithium Deuteride (LiD) with Aluminum (Al) in anhydrous ether (Et2O) to form Lithium Aluminum Deuteride (LiAlD4).

LiD + Al → LiAlD4

Step 2: Reaction with Bromocyclopentane

Add Bromocyclopentane (C5H9Br) dropwise to the Lithium Aluminum Deuteride (LiAlD4) in anhydrous ether (Et2O) at low temperature, stirring continuously. The reaction results in the replacement of the bromine atom with a deuterium atom, forming Monodeuteriocyclopentane (C5H9D) and Lithium Bromide (LiBr).

LiAlD4 + C5H9Br → C5H9D + LiBr + AlD3

Step 3: Workup

Quench the reaction by adding dilute hydrochloric acid (HCl) dropwise to the reaction mixture, stirring continuously. This converts the organometallic reagent to the corresponding alcohol and allows for the separation of the product by extraction with a non-polar solvent such as diethyl ether (Et2O).

C5H9D + HCl → C5H9DOH + DCl

Finally, separate the product (C5H9D) from the ether layer by distillation under reduced pressure.

Overall reaction:

C5H9Br + LiAlD4 → C5H9D + LiBr + AlD3

Note: All reactions involving organometallic reagents should be carried out under inert gas atmosphere, such as nitrogen or argon, to prevent oxidation of the reagents or the products. Also, appropriate safety precautions should be taken as these reagents are highly reactive and can pose fire and explosion hazards.

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Answer:

Ca(2+)

Explanation:

Sodium (Na) only have one valence electron and will lose it in order to gain a full octet. There will be an unbalance of electrons and protons where there are more protons there electrons. The correct ion formula for sodium is Na (1+).

Nitrogen has 5 valence electrons and will gain three more to gain a full octet. There will be an unbalance where there are more electrons then protons. Nitrogen will form the ion N (3-).

Calcium has two valence electrons and will lose them in order to gain a full octet. There will be an unbalance where there are more protons then electrons. Calcium will form the ion Ca 2+

Therefore, Ca2+ is the ion with the correct charge.

2815.9 g  is the maximum mass of ammonia that can be produced by the reaction of 1,000g of nitrogen with 500g of hydrogen

Write the balanced equation.

3H₂ + N₂ → 2NH₃

Calculate the moles of hydrogen in 500g.

n = m/M; where n = moles, m = mass, and M = molar mass.

M(H₂) = 2 × 1.008 g/mol H = 2.016 g/mol H₂

n(H₂) = (500)/(2.016 g/mol) = 248.015 mol H₂

Calculate the moles of nitrogen in 1,000g

M(N₂) = 2 × 14.007 g/mol N = 28.014 g/mol N₂

n(N₂) = (1,000g )/(28.014 g/mol) = 35.696 mol N₂

Calculate the moles of ammonia that can be produced by 248.015 mol H₂ and 35.696 mol N₂, using the mole ratio between each reactant and ammonia in the balanced equation.

248.015 mol H₂ × 2 mol NH₃/3 mol H₂ = 165.34 mol NH₃

35.696 mol N₂ × 2 mol NH₃/1 mol N₂ = 71.392mol NH₃

Because H₂ produces the least number of moles of NH₃, it determines the maximum mass of NH₃.

Calculate the mass of NH₃ in 3.3069 mol.

m = n × M

M(NH₃) = 14.007 g/mol N + (3 × 1.008 g/mol H) = 17.031 g/mol NH₃

m(NH₃) = 165.34 mol × 17.031 g/mol = 2815.9 g NH₃

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If the pressure is increased from 1 atm to 10 atm maintaining the constant temperature of 0℃, Ice will change to liquid water

We know that, pressure is inversely proportional to volume. When pressure in a system increases, the volume would decrease or vice versa.

In the given scenario, the pressure is increased from 1 atm to 10 atm. As the pressure is increased, the volume would decrease.

At 0℃, the volume of ice is higher than the volume of water. The forward reaction is the formation of water which has lower volume from ice. Thus, increasing the pressure would cause the ice to melt and results in the formation of water in liquid state.

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To explain the changes that the balloon underwent using the ideal gas law, we need to consider the variables of the ideal gas law: pressure (P), volume (V), temperature (T), and the number of moles of gas (n).

Here is a table to identify the variable that was changed and the primary effect it had:

| Change | Variable | Effect |

|--------|----------|--------|

| Change 1 | Volume (V) | Increase |

| Change 2 | Temperature (T) | Increase |

| Change 3 | Pressure (P) | Decrease |

| Change 4 | Number of moles (n) | Increase |

1. Change 1: Increase in Volume (V)

  - Effect: The balloon expanded.

  - Explanation: Increasing the volume of the balloon allows more space for the gas molecules, causing the balloon to expand.

2. Change 2: Increase in Temperature (T)

  - Effect: The balloon expanded further.

  - Explanation: Increasing the temperature of the gas increases the kinetic energy of the gas molecules, causing them to move faster and exert greater pressure on the balloon, leading to further expansion.

3. Change 3: Decrease in Pressure (P)

  - Effect: The balloon deflated.

  - Explanation: Decreasing the pressure on the balloon reduces the force exerted by the gas molecules on the balloon, causing it to deflate.

4. Change 4: Increase in Number of moles (n)

  - Effect: The balloon expanded again.

  - Explanation: Increasing the number of moles of gas increases the amount of gas inside the balloon, leading to further expansion.

Overall, these changes demonstrate the relationship between the variables of the ideal gas law and the corresponding effects on the balloon's volume, pressure, and temperature.

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