what is the total gas pressure in atm inside the tank after the addition of nitrogen what is the total gas pressure in atm inside the tank after the addition of argon

1) Gas P is hydrogen as hydrogen burns with a pop sound

2) OH -ve is the ion responsible for making Q alkaline

3)Since OH (-ve ) ion is responsible so it must be basic means Ph is more than 7 or can say between 7 and 14

4)Reaction of calcium with cold water:

Ca (s) + 2H2O (l) --> Ca(OH)2(aq.) + H2 (g)

So basically it is an experiment you also can perform when you hold a lighter near the bubble that formed during the reaction it will burn out with a pop sound.

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The oxidation numbers for each atom in Rh(C2O4)2 are: Rh = +4(each), C = +2 (each), and O = -2 (each).

Assign oxidation numbers to each atom in Rh(C2O4)2:

1. Identify the oxidation numbers of the known atoms: In this compound, we know that the oxidation number of oxygen (O) is always -2 (except in peroxides).

2. Analyze the oxalate ion (C2O4)^2-: Since there are two oxygen atoms (each with an oxidation number of -2), their combined oxidation number is -4.

To balance the charge of the ion, the two carbon atoms must have a combined oxidation number of +4. Each carbon atom, therefore, has an oxidation number of +2.

3. Determine the oxidation number of Rh: In the compound Rh(C2O4)2, there are two oxalate ions, each with a charge of -2, resulting in a total negative charge of -4. To balance this charge, the oxidation number of Rh must be +4.

In summary, the oxidation numbers for each atom in Rh(C2O4)2 are: Rh = +4, C = +2 (each), and O = -2 (each).

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Answer:

  The probability would be 50%.                                                    

Answer:

Your first flip has a 1/2 or 50% chance of getting tails. In order to get 2 tails in a row you have to get tails first and then again. The first flip is 1/2 and the second one is another 1/2. Combined you have a 1/4 chance of getting 2 tails in a row.

Each time you flip you have 1/2 a chance, but when you look at all the flips at once, each consecutive flip of the same side has a smaller probability.

Answer:

The atomic number is the number of protons in the nucleus of an atom . The number of protons define the identity of an element

Answer:

Carbon dioxide molecule

Answer:a , d ,e

Explanation:

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The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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The paired t-test yields a different conclusion than the normal t-test because it accounts for the paired nature of the data, comparing the measurements taken at the top and bottom of the lake separately.

In this scenario, the paired t-test is appropriate because it analyzes the data as pairs, considering the chloride levels measured at the top and bottom of the lake for each sample. By comparing the differences within each pair, the paired t-test determines whether there is a significant difference between the chloride levels at the top and bottom of the lake.

Using the paired t-test, the differences between the paired observations are calculated, and the null hypothesis assumes that the mean difference is zero (no significant difference between the top and bottom chloride levels). The test then determines whether the observed differences are statistically significant at a chosen confidence level, in this case, 95%.

The normal t-test for differences in means, on the other hand, would treat the top and bottom chloride levels as separate and unrelated groups, disregarding their paired nature. By pooling the data and conducting a standard t-test, the analysis assumes that the two sets of measurements are independent, which may not be appropriate in this case. This can lead to a different conclusion compared to the paired t-test.

The different conclusion drawn from using the paired t-test compared to pooling the data and using the normal t-test is due to the consideration of the paired nature of the measurements. The paired t-test takes into account the potential correlation or connection between the measurements taken at the same location (top and bottom of the lake) and assesses the differences within each pair.

Pooling the data and using the normal t-test treats the measurements as independent, disregarding the pairing. This can result in a loss of valuable information and may lead to an inaccurate conclusion. The paired t-test is more appropriate when dealing with dependent or related measurements, ensuring a more accurate assessment of the differences between the top and bottom chloride levels.

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Answer:

a) elastic potential energy

b) kinetic energy

c) the forces acting on the stone are gravitational force and an upward force opposing the gravitational force.

d) potential and kinetic energy

Answer:

What can be said about these common forms of sulphur is that;

(B) They will exhibit same chemical properties

Explanation:

Allotropy is the property of an element to exist in two or more forms in the same physical state

Allotropes have several similar chemical  properties but differ in their physical properties, such as the white, pale yellow to totally colorless diamond and the gray graphite

Sulphur can exist in several allotropic forms, and carbon is the only element that has more allotropes than sulphur

The sulphur allotropes includes S₂, S₆, and S₅ have similar chemical properties but different physical properties.

The correct option is;

What can be said about these common forms of sulphur is that they have the same chemical properties

Answer:

Nonmetals tend to form negative ions due to the number of valence electrons in their atoms. Electrons are those negatively charged particles found...

Explanation:

Non metals tend to gain electrons to from negative ions due to their high electronegative value

Nonmetals are elements that do not have the characteristics of metals. Some of the characteristics of nonmetals are:

Nonmetals have high reactivity than metals and tends to gain electrons to from negative ions because of their high electronegative value. This makes them to attain a stable duplet or octet configuration.

Note: Electronegativity is the tendency of an atom to attract electron(s) to its self.

Thus, we can conclude that nonmetals tend to gain electrons because of their high electronegaive value

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Answer: (A) 1s

Explanation:

The extremophile sulfolobus acidicaldonius survives under high acidity and high temperature.

Thus, the correct answers are high temperature and high acidity (A and E).

A thermoacidophile species, such as Sulfolobus acidocaldarius, belong to the archaea phylum and is resistant to both high temperatures and highly acidic conditions. The adaptions of this species include that the optimal pH of its enzyme will lie below pH 7, since those are acidic conditions. Also, thermoacidophile species can inhabit hydrothermal springs, since they can live in high-temperature conditions.

Your question is incomplete, but most probably your options were

A. high temperature

B. low pressure

C. low oxygen

D. high alkalinity

E. high acidity

Thus, the correct options are A and E.

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According to the given statement It is a heterogeneous mixture can the students conclude about their sample.

If the chemical make-up of a combination remains constant throughout, it is said to be homogeneous. The salt water sample mentioned above is homogeneous due to the evenly distributed salt that has been absorbed across the entire sample. Heterogeneous mixes fall under the two divisions of suspensions and colloids.

The distribution of the particles is not regular in heterogeneous mixtures. With the eye, the heterogeneous combination may be seen. The composition of a heterogeneous mixture is not constant. Pizza, sweaters, and other common mixes are examples of heterogeneous mixtures.

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To increase the water solubility of resorcinol or salicylic acid, 3m naoh is used to dissolve them. the reason why they dissolve better in NAOH than in water is because resorcinol as well as salicylic acid have some measures of acidic hydrogens and so they can be ionized inside of NaOH.

Salicylic acid must be transformed into salicylate because it is insufficiently soluble in water at room temperature to produce the composition you want.

Note that Salicylic acid can be used to accomplish this by reacting with sodium bicarbonate (baking soda) in water; the salicylic acid will dissolve during the reaction.

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Answer:

See Explanation

Explanation:

The compound involved here is BF3(boron triflouride). The central atom is boron and it is surrounded by three fluorine atoms as shown in the image.

When a molecule has three electron domains in its structure, the molecule is trigonal planar. Hence, the molecular geometry of the compound is trigonal planar.

A buffer solution can resist a change in pH even when a strong acid or a strong base is added to it. A buffer solution is made up of a weak acid and its conjugate base, or a weak base and its conjugate acid.A hydrofluoric acid-sodium fluoride buffer solution can be made from hydrofluoric acid and sodium fluoride.

The buffer solution can be calculated as follows: Hydrofluoric acid is a weak acid, with a Ka of 7.1 × 10−4.Moles of Hydrofluoric acid (HF) = 0.30 × VolumefHF = [HF]/V = 0.30 mMoles of sodium fluoride (NaF) = 0.70 × VolumefNaF = [NaF]/V = 0.70 mMoles of Hydrogen Fluoride (H+) = Molarity × Volume = 0.30 × VolumepH = pKa + log ([A-]/[HA])Ka = [H+][A-]/[HA]7.1 × 10−4 = [H+][NaF]/[HF][H+] = 5.3 × 10−4[Naf]/[HF] = 7/3log [NaF]/[HF] = log (7/3) = 0.851pH = pKa + log ([A-]/[HA])pH = 3.86 + 0.851 = 4.71Therefore, the pH of a buffer solution made from equal amounts of 0.30 M hydrofluoric acid and 0.70 M sodium fluoride is 4.71.

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The 95% margin of error for the mean increase in blood pressure that one would expect for cigarette smokers over the time span indicated by the experiment is ±1.98 (rounded off to two decimal places).

The mean increase in blood pressure that one would expect for cigarette smokers over the time span indicated by the experiment can be estimated by using the formula;μ = x ± z(\(a^{2}\)) * σ/√n

Where;μ is the population mean increase.x is the sample mean increase.z(\(a^{2}\)) is the z-scoreα is the level of significanceσ is the population standard deviationn is the sample size.

Substituting the given values into the formula;μ = 9.1 ± 1.96 * 5.5/√37= 9.1 ± 1.98

The mean increase in blood pressure that one would expect for cigarette smokers over the time span indicated by the experiment lies between 7.12 to 11.08.

Hence, the estimated mean increase is between 7.12 to 11.08 millimeters of mercury.

The 95% margin of error can be calculated using the formula;

Margin of error (E) = z(\(a^{2}\)) * σ/√n

Margin of error (E) = 1.96 * 5.5/√37

Margin of error (E) = 1.98 (approximated to two decimal places).

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Sarah discovered that the proportion of O2 in the ocean differs based on the water temperature. Some parts of the ocean have more dissolved O2, while other parts have less.

Sarah recently learned that the proportion of O2 found in the ocean differs based on the water temperature. Specifically, she found out that parts of the ocean have a higher quantity of dissolved O2, while other parts have a lesser quantity of it. This means that the amount of O2 present in the ocean can vary depending on the temperature of the water.

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The weight of 5.3 x 10²⁴ molecules of C₆H₁₂O₆ is 9.5294 x 10²⁶ g

To calculate the weight of 5.3 x 10²⁴ molecules of C₆H₁₂O₆ (glucose), we need to determine the molecular weight of glucose and then multiply it by the given number of molecules.

The molecular formula of glucose (C₆H₁₂O₆ ) indicates that it consists of 6 carbon (C) atoms, 12 hydrogens (H) atoms, and 6 oxygen (O) atoms.

Using the atomic weights of carbon (12.01 g/mol), hydrogen (1.01 g/mol), and oxygen (16.00 g/mol), we can calculate the molecular weight of glucose:

To find the molecular weight of glucose, we add up the atomic weights of all the constituent atoms:

(6 x atomic weight of carbon) + (12 x atomic weight of hydrogen) + (6 x atomic weight of oxygen)

(6 x 12.01 g/mol) + (12 x 1.01 g/mol) + (6 x 16.00 g/mol) = 180.18 g/mol

The molecular weight of glucose (C₆H₁₂O₆ ) is 180.18 g/mol.

To find the weight of 5.3 x 10²⁴ molecules of glucose, we can use the following equation:

Weight = Number of molecules x Molecular weight

Weight = (5.3 x 10²⁴ molecules) x (180.18 g/mol)

Calculating this expression:

Weight = 9.5294 x 10²⁶ g

Therefore, the weight of 5.3 x 10²⁴ molecules of C₆H₁₂O₆ (glucose) is approximately 9.5294 x 10²⁶ grams.

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We must first determine the molar mass of the compound to convert it to grams, which we use to calculate the molecular weight.

It is possible to determine the molar mass of \(C_6H_1_2O_6\) (glucose), by adding the atomic masses of its constituent parts:

C: 6 atoms x atomic mass of carbon (12.01 g/mol) = 72.06 g/mol

H: 12 atoms x atomic mass of hydrogen (1.01 g/mol) = 12.12 g/mol

O: 6 atoms x atomic mass of oxygen (16.00 g/mol) = 96.00 g/mol

Total molar mass of \(C_6H_1_2O_6\) = 72.06 g/mol + 12.12 g/mol + 96.00 g/mol = 180.18 g/mol

Now we can find the weight of \(5.3 * 10^2^4\) C6H12O6 molecules using this molar mass:

(number of molecules) x (molar mass) = weight (in grams).

(5.3 x \(10^2^4\) molecules) x (180.18 g/mol) = weight

Weight = 9.00 x \(10^2^6\) grams

Therefore, the weight of 5.3 x \(10^2^4\) molecules of C6H12O6 is approximately 9.00 x\(10^2^6\) grams.

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group j neptunium Atomic number 93

Answer:

one of series of tests

Explanation:

test (something, especially a new product) to assess its suitability or performance.

"all seeds are carefully trialed in a variety of growing conditions"

Medical Definition of trial

1 : a tryout or experiment to test quality, value, or usefulness — see clinical trial. 2 : one of a number of repetitions of an experiment. trial.

Answer:

last onee

Explanation:

The answer to this question is it allows for great diversity among the finches, allowing the population to survive even if there is an ecological change.

Charles Darwin is known as the inventor of the famous theory of evolution. Darwin's Theory of Evolution states that those with characteristics best suited to their environment are more likely to survive and reproduce. Individuals then pass on these desirable characteristics to their offspring.

Finches have beaks that specialize in eating insects. Charles Darwin realized that they all descended from a common ancestor. When they scattered to different islands. These birds have adapted to eat a wide variety of available foods. A long period of natural selection has produced 13 different species of finches.

The environment is a factor that may naturally manipulate the species. And the environment also causes the species to change over time.

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At the end of 60 hours, 1/16th of the original sample of sodium-60 will remain.


The half-life of sodium-60 is 15.0 hours. This means that half of the initial sample will decay in each half-life period. If we start with 16 grams of sodium-60, then after the first 15.0 hours, there will be 8 grams remaining. After the second 15.0 hours, there will be 4 grams remaining. And after the third 15.0 hours, there will be 2 grams remaining.

At this point, we have reached 45.0 hours. There are still 15.0 hours left until the 60.0 hour mark, which is exactly one half-life. Therefore, we can calculate that there will be half of the remaining 2 grams remaining, which is 1 gram.

Therefore, at the end of 60.0 hours, only 1/16th of the original sample of sodium-60 will remain. This is because we have gone through four half-life periods, and 2^4 (or 16) is the same as the initial amount of sodium-60 we started with.

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Answer:

perform multiple trials for each release height instead of just one

Explanation:

Based on the correlation coefficients (R =) of the Beer's Law plots, it is clear that the two dyes to be used are the ones with correlation coefficients closest to 1.000.

Coefficients are numerical values that are used to describe the relationship between two or more variables. In mathematics, they are often used in equations to represent the relative strengths of different factors or components of the equation. In statistics, they can be used to represent the strength of the correlation between two variables. They can also be used to represent the magnitude of a change in one variable that is caused by a change in another variable.

Based on the correlation coefficients (R =) of the Beer's Law plots, it is clear that the two dyes to be used are the ones with correlation coefficients closest to 1.000. This shows that the equations are highly linear, indicating that the data is very good. Therefore, the two dyes to be used are the ones with the highest correlation coefficients, and the amount to be used can be determined by the Beer's Law equation, which shows the relationship between absorbance and concentration.  

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Answer:

Sodium hydroxide is deliquescent (absorbs moisture from the atmosphere) solid. It cannot be weighed accurately. Therefore, it is not possible to prepare a standard solution of sodium hydroxide of accurately known concentration by weighing NaOH.