Convert the following to Kelvin
12) 0° C
13) -50° C
14) 90° C
15) -20° C

A 25.0-ml sample of 0.10 M HCl is titrated with the 0.10 M NaOH. The pH of the solution after the 12.7 ml of NaOH have been added to the acid is 1.4.

The moles of the HCl = molarity × volume

The moles of the HCl = 0.10  × 0.025

The moles of the HCl = 0.0025 mol

The moles of the NaOH = molarity × volume

The moles of the NaOH = 0.10  × 0.0127

The moles of NaOH = 0.00127 mol

HCl  +  NaOH ----> NaCl  +  H₂O

0.0025 mol of the HCl  react with the 0.0025 mol

Remaining moles =  0.0025 - 0.00127

                             = 0.00123 mol

[H⁺] = 0.00123 / ( 0.025 + 0.0127)

       = 0.033 M

pH = - log [H⁺]

pH = 1.4

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Answer:

D. severe weather events would occur more often

Explanation:

If the average global temperatures on Earth increased, there are high chances of severe weather events occurring more often

Increase in average global temperatures can result in these disasters.

When global temperatures increases, polar ice will melt and sea levels will increase.

This will cause storms in coastal areas and flooding.

Answer:

A BIG DI*CK

Explanation:

Answer:

1. Convert the mass of A to moles dividing in molar mass

2. Convert the moles of A to moles of D (2mol A = 3mol D)

3. Convert the moles of D to mass multiplying by its molar mass

Explanation:

As you can see in the equation, 2moles of A produce 3 moles of D, the equation is:

2mol A = 3mol D

But in the problem you are having the mass of A and you need the mass of D. That means you require to convert the mass of A to moles. With the moles of A you can find the moles of D and, as last, you need to convert the moles of A to mass.

To convert mass to moles or vice versa you must use Molar Mass. That means, the answer is:

Answer:

83 mL

Explanation:

Use the dilution equation M1V1 = M2V2

M1 = 18 M

V1 = ?

M2 = 6.0 M

M2 = 250 mL

Solve for V1 --> V1 = M2V2/M1

V1 = (6.0 M)(250 mL) / (18 M) = 83 mL

The amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.

The volume of a solution can be calculated using the following formula:

Volume = no of moles ÷ molarity

According to this question, 0.50 molal solution is used to prepare 0.50 moles of sodium chloride. The volume of the solution is calculated as follows:

Volume = 0.50 moles ÷ 0.5M

Volume = 1L

Therefore, the amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.

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The difference in binding energy per nucleon between 23/11 Na and 23/12 Mg can be calculated by finding the total binding energy for each isobar and dividing it by the respective number of nucleons.

To calculate the difference in binding energy per nucleon between the isobars 23/11 Na and 23/12 Mg, we need to find the total binding energy for each isobar and then divide it by the respective number of nucleons.

The atomic mass of 23/11 Na is 23, which means it has 23 nucleons (protons and neutrons). The atomic number is 11, indicating it has 11 protons.

The atomic mass of 23/12 Mg is also 23, so it has 23 nucleons. However, the atomic number is 12, indicating it has 12 protons.

We can use the equation:

Binding Energy per Nucleon = (Total Binding Energy) / (Number of Nucleons)

To find the total binding energy, we can consult a table or use an approximate average value. Let's assume the average binding energy per nucleon for both elements is 8.5 MeV (million electron volts).

For 23/11 Na:

Binding Energy per Nucleon = (Total Binding Energy of Na) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

For 23/12 Mg:

Binding Energy per Nucleon = (Total Binding Energy of Mg) / (Number of Nucleons)

                         = (8.5 MeV) / (23 nucleons)

The difference in binding energy per nucleon can then be calculated by subtracting the value for Na from the value for Mg.

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Answer:

Explanation:

V1/T1 =V2/T2    at constnant pressure

Answer:

c

Explanation:

The mass of sodium phosphate required to completely eliminate ions from hard water has been 22.4269 g.

The dissolved calcium and magnesium components in the solution have been identified as the hard water. The removal of these substances from the sample has decreased the hardness of the water.

When calcium chloride and magnesium nitrate were removed with sodium phosphate, the balanced reaction was as follows:

3Ca\(Cl^{2}\)+2\(Na_{3} Po^{4}\)⇒6NaCl+Ca3(\(Po^{4}\))2

3Mg(N\(O^{3}\))2+2\(Na_{3} Po^{4}\)⇒6NaNO3+Mg3(\(Po^{4}\))2

The moles of sample in the solution has been given by:

Moles=Molarity x volume(L)

The moles of calcium chloride in 0.054 M, 1.4 solution has been:

Moles Ca\(Cl^{2}\)=0.054x1.4

Moles Ca\(Cl^{2}\)=0.0756 mol

There have been 0.0756 mol of calcium chloride available.

2 moles of sodium phosphate are needed, according to the chemical equation, to neutralise 3 moles of calcium chloride.

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The mass of 7,00 × 10²² NaOH molecules is 4,64 gram. 7,00 × 10²² NaOH molecules equal 0.116 moles NaOH.

To find out the mass of 7,00 × 10²² NaOH molecules you can use the following steps

Step 1: The first step is to calculate the number of moles of the compound.

mol = number of particles ÷ Avogadro's number

      = 7,00 × 10²² ÷ 6,022 × 10²³

      = 0,116 mol

Step 2: The next step is to calculate the mass of the molecules.

mass = mol × relative molecular mass

         = 0,116 mol × 40 gram/mol

          = 4,64 gram

So the mass of 7,00 × 10²² NaOH molecules is 4,64 gram.

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Answer:

It can be formed either through a process of evaporation or sublimation. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form

Explanation:

hope it help

Answer:

No. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form

Answer:

a fundamental universal constant, the speed at which light and all forms of electromagnetic radiation travel in a vacuum, standardized ...

Explanation:

299 792 458 m / s

Answer:

touch it :)

Explanation:

Answer: I Believe The answer to this question is to hover your hand over the piece of Metal, life what'd you do in a house fire to tell if the doorknob is hot.

Explanation:

Electronegativity generally increases as you go across a row, or period, in the periodic table.

Electronegativity is a measure of an atom's ability to attract electrons towards itself in a chemical bond. As you move across a row in the periodic table from left to right, the number of protons in the nucleus increases, leading to a greater positive charge in the nucleus. This increasing positive charge pulls the electrons closer to the nucleus, resulting in a higher electronegativity.

Additionally, as you move across a period, the atomic size decreases. With a smaller atomic size, the outermost electrons are closer to the nucleus, which increases the attractive force between the electrons and the nucleus. This stronger attraction contributes to a higher electronegativity.

Thus, the combination of increased nuclear charge and decreased atomic size as you move across a period leads to an overall increase in electronegativity.

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Answer:

a) The predominant Brownstead-Lowry acid- base is perchloric acid

b) A conjugate acid base pair is HClO4 and ClO4^-

c) forward reaction is favored and equilibrium position lies towards the far right

Explanation:

The molecular equation is;

HClO4(aq) + NaH2PO4(aq) -----> H3PO4(aq) + NaClO4(aq)

The net ionic equation of the reaction is;

H^+(aq) + H2PO4^-(aq) ----> H3PO4(aq)

The predominant Brownstead-Lowry acid- base is perchloric acid .

A conjugate acid base pair is HClO4 and ClO4^-

Since the both species; perchloric acid and sodium dihydrogen phosphate are both highly soluble in water yielding ions and also dissociate to a large extent in solution, the forward reaction is favoured leading to the formation of phosphoric acid. Remember that phosphoric acid does not easily dissociate in solution hence the forward reaction is faster than the reverse reaction and the equilibrium position lies towards the far right.

The 85th percentile of blood pressure readings is approximately 137.64. a. To calculate the z-score for a blood pressure reading of 140, we can use the formula:

z = (x - μ) / σ

where x is the value (140 in this case), μ is the mean (121), and σ is the standard deviation (16).

Substituting the values into the formula:

z = (140 - 121) / 16

z ≈ 1.19 (rounded to two decimal places)

b. To find the proportion of Canadians with high blood pressure, we need to calculate the area under the normal distribution curve for values above 140. This can be done by finding the cumulative probability using the z-score.

Using a standard normal distribution table or a calculator, we can find that the cumulative probability corresponding to a z-score of 1.19 is approximately 0.881.

Therefore, the proportion of Canadians with high blood pressure is approximately 0.881 (rounded to four decimal places).

c. To find the proportion of Canadians with systolic blood pressure in the range from 100 to 140, we need to calculate the area under the normal distribution curve between these two values.

Using the z-scores corresponding to 100 and 140, we can find the cumulative probabilities for each value. The cumulative probability for a z-score of -1.25 (corresponding to 100) is approximately 0.105, and the cumulative probability for a z-score of 1.19 (corresponding to 140) is approximately 0.881 (as calculated in part b).

The proportion with systolic blood pressure between 100 and 140 is the difference between these two probabilities:

Proportion = 0.881 - 0.105 ≈ 0.776 (rounded to four decimal places)

d. The 85th percentile represents the value below which 85% of the blood pressure readings fall. To find the 85th percentile, we need to determine the z-score that corresponds to an area of 0.85 under the normal distribution curve.

Using a standard normal distribution table or a calculator, we can find that the z-score corresponding to an area of 0.85 is approximately 1.04.

To find the actual blood pressure reading at the 85th percentile, we can use the z-score formula:

x = μ + (z * σ)

Substituting the values:

x = 121 + (1.04 * 16)

x ≈ 137.64

Therefore, the 85th percentile of blood pressure readings is approximately 137.64.

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The arrangement of the gases in terms of  deviations from ideal behavior is; chlorine > fluorine > oxygen > Nitrogen.

We know that gases tend to follow the idea gas law. The gases that have ideal behavior tend to show this behavior at high temperatures and low pressure such that the interactions between the gas molecules could be regarded as non existent.

Now; we know that the greater the molar mass of the gas, the greater the gas tends to depart from ideal behavior. As such we would tend to arrange the gases in order of decreasing molar mass.

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Answer:

ive learned about the chart , ive learned about the coolest chemicle reactions and how. the can change colors , ive also learned that chenistrey is all around us since the beginning of life ,and how liquid can turn solid

Explanation:

Answer:

Electronic configuration of Cl = 2,8,7

Valency of Cl = -1

Explanation:

Given,

The atomic number of X = 17

  Element with atomic number 17 = Chlorine(Cl)

The mass number of element = 35

Electronic configuration of Cl = 2,8,7

Valency of Cl = -1

Hydration is a specific example of the phenomenon known generally as a. solvation

The act of hydrating involves combining or dissolving an object in water. It is a particular instance of the more general phenomena known as solvation, which is the process by which solvent molecules surround and scatter a solute to create a homogeneous solution. However, hydration explicitly refers to solvation with water as the solvent.

Solvation may also happen with solvents other than water. Solvation is the process through which a solute and solvent interact to stabilise a solute species. Due to its impact on the solubility, reactivity, and behaviour of compounds in solution, solvation is a crucial mechanism in many chemical and biological processes.

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Pka values below -2 represent strong acids.

A strong acid is one that completely dissociates in water, releasing a high concentration of hydrogen ions (H+). The strength of an acid can be determined by its pKa value, which is the negative logarithm of the acid dissociation constant (Ka).

In general, pKa values below -2 are considered indicative of strong acids. Acids with lower pKa values have higher acidity and readily donate protons in aqueous solutions.

Therefore, among the given pKa values, any value below -2 would represent a strong acid.

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Answer:

A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly

12 grams of carbon-12 (i.e., 6.023 X 1023).

Explanation:

The following statements are true regarding the use of indicators in selective media: they provide a visible change in the media indicating a reaction.

They often indicate whether an acid or base has been produced they may react with a product from a biochemical reaction to produce a color change. Indicators are substances that change color based on their response to an alteration in pH, such as the presence of acidic or basic components. Indicators are used in selective media to reveal the presence of the required organisms. The use of indicators in selective media has several benefits.

When the organism grows in a selective medium that has been supplemented with an indicator, the presence of the organism is immediately apparent because the indicator undergoes a color change as a result of the metabolic activity of the organism.

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Answer:

Explanation:

The insects have been defined as the most successful arthropods. There are far more species in the class Insecta than in any other group of animals. The insects are the only invertebrates with wings.

The insects play a very important role in the web of the life in every environment. Their jobs include pollinating flowering plants, since it is the source of food for insectivorous animals and it assist in the decomposition of plants and animals.

The two different methods which help to identify the species of the insects from the eggs on human remains are by using a small paint brush dipped in water and the other way is by using the forceps.

The study of insects and their life cycle are found to be important for the forensic entomologist. This is because it could set a timeline on when the crime is happened. The life cycle of a blowfly starts as an egg and then goes to be maggots.

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The two types of hard water is temporary hard water and permanent hard water. Temporary hard water is softened by boiling.

What is hard water?

Hard water is known to be highly concentrated in calcium and magnesium largely due to to the ions of these elements dissolved in ground water that have the presence of these elements which could be sourced from rocks with the additional help with water from rain. A physical evidence that a water is hard water would be that it doesn't lather easily with soap.

In summary, temporary hard water responds to heating which makes the water much more easier to be used for laundry, and drinking.

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Answer:

This would be considered an average speed, as it's an estimate of how fast the cheetah can run over a certain distance, taking into account variations in its speed. It's not instantaneous, which would refer to the speed at a specific moment, and it's not constant, which would refer to the same speed being maintained over a period of time.

Sn2 mechanism for nucleophilic substitution reactions involves one step and occurs with inversion of configuration is true.

Sn2 is a single-step mechanism in which the bond is broken by the attacking nucleophile from the back of the carbon atom. Two reactants are involved in this reaction.

In this mechanism, The nucleophile approaches the substrate at 180° to the carbon leaving group. The carbon-nucleophile bond is formed and the carbon leaving group breaks.

The nucleophile can attack at the same side where the leaving group is present or the nucleophile can attack from the opposite side of the carbon atom. Since complete inversion of configuration is required, so it is compulsory for the nucleophile to attach from the opposite side.

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