What is the predicted change in the boiling point of water when 2.10 g of
barium chloride (BaCl2) is dissolved in 5.50 kg of water?

Answer: 4,3,2

Explanation:

Answer:

poh = .253

p h2o= p[H+] +P[OH-]

ph2o is 14

14= pH+ + poH

14 = pH+ +.253

14-.253 =pH+

13.747 =ph+

and we know that

log [H+] = -pH+

[H+] = antilog pH+

H+ = antilog 13.747

H+ = 1.79×10-15

The mass of HCl in the flask is approximately 0.1109 grams.

To indicate the reaction's endpoint in this titration, phenolphthalein is utilised as an indicator. Water and a salt are produced by the reaction between the base (NaOH) and acid (HCl). When sufficient base has been supplied to completely neutralise all of the acid present, the indicator's colour changes from colourless to pink, signalling the reaction's completion.

According to the information provided, the amount of HCl(ag) in the flask is 25.00 mL, and the amount of NaOH(ag) is 0.150 M. To attain the endpoint, 20.20 mL of NaOH(ag) are needed.

To calculate the amount of HCl(ag) present in the flask, we can use the equation:

moles of HCl = moles of NaOH

moles of NaOH = concentration of NaOH x volume of NaOH used

moles of NaOH = 0.150 M x 0.02020 L = 0.00303 moles

moles of HCl = 0.00303 moles

To convert moles of HCl to grams, we need to use the molar mass of HCl:

molar mass of HCl = 1.00794 g/mol (for H) + 35.453 g/mol (for Cl) = 36.46094 g/mol

mass of HCl = moles of HCl x molar mass of HCl

mass of HCl = 0.00303 moles x 36.46094 g/mol = 0.1109 g

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Answer:

Those people could sustain on Mars, by living closer to the poles

Explanation:

As it is given that caps involve the water ice instead of the carbon dioxide

And, current observations of spectrum analyzed that the polar caps are totally different from one other i.e northern one involves more water ice while on the other hand,  the southern one involves most of the carbon dioxide

Moreover, the astronomers unable to see to spectrum portions as the atmosphere absorbs the wavelength

So we conclude that the people could survive on mars if they live near to poles

Answer:

I think that the statement is relative to speed because it is saying km per second.

Answer:

Speed

Explanation:

The pH of a cola is 3.120, which means that the concentration of H3O+ ions in the solution is 10^(-pH) or 7.93x10^(-4) M.

This is because pH is defined as the negative logarithm (base 10) of the concentration of H3O+ ions in a solution. Therefore, if we take the antilog of the pH value, we get the concentration of H3O+ ions in the solution. In this case, we have to round the value to three significant figures, since the pH value is given to three decimal places. So, the molar concentration of H3O+ in a cola with a pH of 3.120 is 7.93x10^(-4) M.

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The molar concentration of [H3O+] in a solution can be calculated using the pH. Here, it is found to be approximately 7.59 x 10^-4 M.

The concentration of [H3O+] in a solution can be calculated using the pH of the solution. The formula to calculate the concentration of H3O+ is 10^(-pH). Thus, in this case, the molar concentration of H3O+ in cola with a pH of 3.120 is 10^(-3.120). Using a calculator we get the result approximately to be 7.59 x 10^-4 M. Therefore, the molar concentration of [H3O+] in the cola is 7.59 x 10^-4 M.

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Answer:

B!

Explanation:

The relative mass of both protons and neutron are 1, while mass of electrons is about \(\frac{1}{1836}\). I hope this makes it simpler to understand.

The energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.

The term enthalpy is defined as the sum of the system's internal energy and the product of its pressure and volume.  

Ice warming Cs = 2.09 J/g∙°C

Enthalpy of fusion ∆H = 6.02 kJ/mol

Liquid water warming Cs = 4.18 J/g∙°C

Enthalpy of vaporization ∆H = 40.7 kJ/mol

Steam Warming Cs = 2.01 J/g∙°C

Step 1: Warm ice from −15.0°C to 0°C.

q1 = 470.25 joule

Step 2: Melt ice.

q2 = 5016.66

Step 3: Warm liquid water from 0°C to 45.0°C.

q3 = 2821.5 joule

The total energy is the sum of the energy of each step.

q = q1 + q2 + q3

= 470.25 + 5016.66 + 2821.5

= 8.30kj

Thus, energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.

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12 moles of H₂ need to produce 8 moles of NH3 if you have plenty of N₂ .

What is a chemical reaction ?

Chemical reaction, the process by which one or more substances (reactants) are transformed into one or more other substances (products). Substances are either chemical elements or compounds. Chemical reactions rearrange the constituent atoms of reactants to produce different substances as products.

Chemical reactions are  part of technology, culture, life . Fuel combustion, glass and pottery making, beer , and wine and cheese making are few examples. Activities involving chemical reactions that have been around for thousands of years. Chemical reactions are abundant in a variety of complex processes occurring in the Earth's geology, atmosphere and oceans, and in all biological systems.

The balanced chemical equation is:

N2+3H2→2NH3

From stoichiometry,

2 mol of NH3

is produced from 3 mol of H2

8 mol of NH3 will be produced from = 3/2×8=12 mol of H2

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8.11 ×10⁻¹⁹ J is the energy of a photon with a wavelength of 245 nm.

The distance that lies across the two locations on a wave is called its wavelength, and it frequently needs to be measured from peak to the lowest point or from low to trough. Common units of measurement are meters, centimeters, or nanometers. Since frequency and wavelength are inversely correlated, the shortest the wavelength, the bigger the rate of change.

According to the De Broglie relation, a photon possessing a wavelength of 245 nm will have an energy of 8.11 1019 J.

The wavelength is the separation between two bottoms or peaks that follow one another. The top and bottom points of a wave are called its peak and trough, respectively.

The wave's energy and wavelength have the following relationships:

E=hc / λ

E= 8.11 ×10⁻¹⁹ J

Among the various kinds of ocean or sea energy that waves produce is wave energy. Uneven warmth from the sun of the planet causes the wind to be produced, and the breeze that blows over water causes waves to be produced.

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Answer:

The answer is "6.68 \(\frac{ml} {hr}\)".

Explanation:

It's going to be 18.18 kg to turn body mass to kg.  

Size 1mg / kg / hr, therefore = 1 x 18.18

                                               = 18.18 kg / hr  

now we adding 30 mg / ml of dextrose = 30 x 15

                                                                 \(=\frac{450mg}{15 ml +150 ml}\)

of dextrose, from 15 ml to 150 ml;  

Therefore, now 450 mg in 165m:    

\(= \frac{ 450}{165}\\ \\=2.72 \frac{mg} {ml}\)  

now divide the   18.18 by 2.72:

\(=\frac{18.18}{2.72}\)

= 6.68 \(\frac{ml} {hr}\)

The nurse teaches a client about the dangers of using sodium bicarbonate regularly. The effect of sodium bicarbonate is the nurse trying to prevent will be Sodium bicarbonate use over an extended period of time may result in sodium and water retention together with systemic alkalosis.

Feeling thirsty, experiencing stomach cramps, and experiencing gas are typical sodium bicarbonate side effects. You could be more vulnerable to adverse reactions that are more severe if you have certain medical conditions, such as high blood pressure, heart failure, and especially kidney disease.

An antacid was using to treat acid indigestion and heartburn is also sodium bicarbonate. In some circumstances, your doctor may also advise you to take sodium bicarbonate to reduce the acidity of your blood or urine. Ask your doctor as well as a pharmacist for more details if you're interested in using this drug for any other conditions.

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Answer:

they are very dangerous.

Explanation:

they cause disease in humans, animals, crops, and can cause permanent damage to immune systems.

Answer:

viruses can shut your immune system and infect blood cells thus killing you. vaccines will provent this by prepering your immune system so when you get said virus, it will reduce your chance of death

Explanation:

im not smart with health but i hope this is correct!

3.0 moles of KNO₃ must be dissolved in water in total in order to create a 2.0 M solution with a capacity of 1.5 liters. The right response is (C) 3.0 mol.

To determine the number of moles of KNO₃ that must be dissolved in water to make a 2.0 M solution with a volume of 1.5 liters, we need to use the formula:

Molarity = moles of solute / volume of solution

Rearranging this formula to solve for the moles of solute, we get:

moles of solute = Molarity x volume of solution

Substituting the given values, we get:

moles of KNO₃ = 2.0 mol/L x 1.5 L = 3.0 mol

Therefore, the total number of moles of KNO₃ that must be dissolved in water to make a 2.0 M solution with a volume of 1.5 liters is 3.0 moles. The correct answer is (C) 3.0 mol.

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Answer:

CO3- is an example of a polyatomic ion.

Explanation:

Electrons are passed through a series of redox reactions, and each transfer causes protons to be pumped across the membrane. This creates a concentration gradient, which is used to power ATP synthesis through the process of chemiosmosis.

During chemiosmosis in aerobic respiration, protons are pumped across the inner mitochondrial membrane from the matrix to the intermembrane space.

Aerobic respiration is a process of producing energy that involves the complete breakdown of glucose in the presence of oxygen. It is a crucial metabolic pathway that is present in all higher organisms, including humans.Chemiosmosis is the process in which a transmembrane electrochemical gradient drives ATP synthesis. It is an important part of cellular respiration and oxidative phosphorylation.

During the process of oxidative phosphorylation, protons are pumped across the inner mitochondrial membrane, which creates a proton gradient that powers the synthesis of ATP. In aerobic respiration, the electron transport chain (ETC) is the primary mechanism that generates the proton gradient.

Electrons are passed through a series of redox reactions, and each transfer causes protons to be pumped across the membrane. This creates a concentration gradient, which is used to power ATP synthesis through the process of chemiosmosis.

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Answer:

"Forensic science is a critical element of the criminal justice system. Forensic scientists examine and analyze evidence from crime scenes and elsewhere to develop objective findings that can assist in the investigation and prosecution of perpetrators of crime or absolve an innocent person from suspicion."

Explanation:

Strictly from: https://www.justice.gov/olp/forensic-science#:~:text=Forensic%20science%20is%20a%20critical,an%20innocent%20person%20from%20suspicion.

Forensic science is any science used to aid in a criminal/legal investigation

The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.

For (1),

The longest straight chain have 7 carbon compound and having single bond, suffix of this compound is Heptane. Now there are three functional group of methyl there for prefix is trimethyl. Overall the name of compound is 3,4,5-trimethylheptane.

The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are four functional group of methyl there for prefix is tetramethyl. Overall the name of compound is 2,2,3,3-tetramethylpentane.

The longest straight chain have 5 carbon compound and having single bond, suffix of this compound is pentane. Now there are three functional group of methyl and ethyl so they write according to alphabetic order. Overall the name of compound is 2,2- dimethyl-3-ethylpentane.

Thus, we concluded that the The Iupac Name of given three compounds are 3,4,5-trimethylheptane, 2,2,3,3-tetramethylpentane and 2,2- dimethyl-3-ethylpentane.

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Answer:

nucleus

Explanation:

An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.

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The molar solubility of Na3PO4 in a saturated solution where [Na+] = 0.30 M is 1.0 x 10^-26 M.

The molar solubility of Na3PO4 can be determined using the solubility product constant (Ksp) expression for the dissociation reaction of Na3PO4:
Na3PO4(s) ⇌ 3Na+(aq) + PO43-(aq)
Ksp = [Na+]^3[PO43-]
Since the solution is saturated, the concentration of Na+ is given as 0.30 M. Therefore, we can substitute this value into the Ksp expression and solve for the molar solubility (x) of Na3PO4:
Ksp = (0.30 M)^3 (x)
Simplifying the expression, we get:
Ksp = 0.027x
Rearranging the equation, we can solve for x:
x = Ksp / 0.027
The value of Ksp for Na3PO4 is 2.7 x 10^-28 (at 25°C), so substituting this value into the equation gives:
x = (2.7 x 10^-28) / 0.027
x = 1.0 x 10^-26 M
Therefore, the molar solubility of Na3PO4 in a saturated solution where [Na+] = 0.30 M is 1.0 x 10^-26 M.

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In 1911, astronomers Hertzsprung and Russell independently plotted the spectral class (temperature) against the luminosity (energy emited) for known stars. They discovered that the stars were grouped together in different regions on the graph. This graph is now known as the Hertzsprung- Russell Diagram (see attached image).

The HR diagram shows us that there are different types of stars and that stars evolve in different ways depending on their initial mass. This can tell us what reactions are occurring in the stars' cores.

Stars follow a distinct path as seen on the diagram, and evolve in the following ways:

- Main Sequence > red giant > planetary nebula > white dwarf

- Main Sequence > supergiant > supernova > blackhole/neutron star

- Main Sequence > white dwarf

Temperature: surface temperature of stars

Absolute magnitude: measure of the luminosity or brightness of a star

Luminosity: the relative magnitude, relative to the magnitude of our sun

Spectral Class: temperature group of stars. categorised into OBAFGKM. Stars on the left the the hottest.

Main Sequence: Majority of stars lie in the main sequence, including our sun. These stars are fusing hydrogen to helium in their cores.

Red giants/Super giants: consists of a small minority of stars found at the top right of the HR diagram. These are very large and luminous, but have a much cooler temperature.

White Dwarfs: consists of a majority of stars, found at the bottom left of the HR diagram. These have very low luminosity, despite relatively high surface temp. and undergo fusion. These will not evolve anymore and will continue until all energy is used up in its core, and die out.

Blue Giants: rare, short-lived stars, and very luminous, hot, bright, and massive. These are found in the top left of HR diagrams, and are fusing heavier elements in their cores. They don't last long and will quickly evolve into white dwarfs.

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Fractional distillation

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

As two chemicals interact they can change

Explanation:

Some times smoke can indicate a chemical change

The product of the number 1.00 x 10³ and the measurement 0.00357 m, expressed in the correct number of significant digits, is 3.57.

To determine the product of two numbers while considering significant digits, we need to multiply the numbers and then round the result to the appropriate number of significant digits based on the given measurements.

In this case, the number 1.00 x 10³ has three significant digits because the trailing zeros after the decimal point and before the non-zero digit are considered significant. The measurement 0.00357 m has four significant digits as all non-zero digits in a decimal number are significant.

Performing the multiplication, we get:

(1.00 x 10³) * (0.00357 m) = 3.57 m

Since the measurement 0.00357 m has the smallest number of significant digits (four), we round the product to match that precision. Therefore, the product is expressed as 3.57, with four significant digits.

It's important to note that the rules of significant digits help ensure the accuracy and precision of calculations and measurements. By considering the appropriate number of significant digits, we can properly convey the level of certainty and precision in our calculations and measurements.

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The correct choice is A) −5Δ[Br−]/Δt. The rate expressed as Δ[Br2]/Δt is proportional to -5 times the rate of change of Br−.

In the given reaction 5Br−(aq) + BrO3−(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(aq), the stoichiometric coefficients provide information about the relationship between the reactants and products. To determine the rate expressed as Δ[Br2]/Δt, we need to compare it with the rate of change of the other species.

Based on the balanced equation, for every 5 moles of Br− consumed, 3 moles of Br2 are produced. Therefore, the rate of change of Br−, Δ[Br−]/Δt, is related to the rate of change of Br2, Δ[Br2]/Δt, by a factor of -5/3.

The other choices, B) −0.6Δ[Br−]/Δt, C) 3Δ[BrO3−]/Δt, and D) −Δ[H2O]/Δt, do not correspond to the correct relationship based on the stoichiometric coefficients of the reaction. Therefore, the correct answer is A) −5Δ[Br−]/Δt.

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