A student adds alka-seltzer to pure water and the final ph of the solution is 8.3. what ion was released by alka-seltzer to change the ph?

The temperature of 3.69 L, 1.5 moles gas at a pressure of 389 mmHg would be 15.3 K.

The ideal gas law can be mathematically expressed as follows:

PV = nRT

Where:

P is the pressure

V is the volume

n is the number of moles

R is the gas constant and is 0.082  L atm K-1 mol-1

T is the temperature

In this case, P = 389 mmHg = 0.51 atm, V = 3.69 L, n = 1.5 mol

Making T the subject:

T = PV/nR

  = (0.51 x 3.69)/(1.5 x 0.082)

   = 15.3 K

In other words, the temperature of the gas would be 15.3 K.

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The equilibrium constant of the reaction from the calculation that has been done is 0.154

The concentrations (or partial pressures) of reactants and products in chemical equilibrium for a specific chemical reaction are related by the equilibrium constant (K), a mathematical equation. It quantifies the degree to which an equilibrium has been reached in a reaction.

We have the equation of the reaction as;

A(g) + B(g) ⇔C(g)

Thus;

Keq = 45.83/11.23 * 26.50

Keq = 0.154

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According to the law of conservation of mass, the mass of the reactants and products before the reaction must be equal. He is mistaken since the process of rusting the nail is occurring, and the mass of the finished product is growing.

what is the law of conservation of mass?

According to the law of conservation of mass of reactants before the reaction must be equal to the mass of the product.

What is rusting?

Rusting is a form of oxidation. Rust is formed when iron combines with water and oxygen to generate hydrated iron oxide. Which is given by.

Iron is present in nails, which when coupled with oxygen produces ferrous oxide, which is heavier than iron. The mass of the reactants is therefore greater than the mass of the result.]

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Answer:

K°(g)* + 419 Kj/mole => K⁺(g) + e⁻

Explanation:

1st ionization step for potassium is the ionization of the 4s¹ electron. This requires 419 Kj/mole energy (endothermic). The reaction equation is ...

K°(g)* + 419 Kj/mole => K⁺(g) + e⁻

*note: Ionization of group IA metals requires they be in gas phase. That is, as shown by the Born-Haber Cycle** for formation of ionic compounds ...

K°(s) + 89.24 Kj/mole => K°(g); then ...

K°(g) + 419 Kj/mole => K⁺(g).

**Recommend review of Born-Haber cycle for formation of ionic compounds.

Answer:

Explanation:

Problem:

In a gender based experiment, the blood pressure of different ages of men is been checked and recorded to determine if there is any correlation. What will be the independent, dependent and controlled variables?

Answer:

A controlled variable is the variable that is left constant throughout the course of an experiment. The controlled variable here is the gender.

A dependent variable is the variable that is been determined or measured during the course of an experiment. The dependent variable here is the blood pressure.

An independent variable is the variable that is intentionally or decidedly altered during the course of an experiment. The independent variable here is the age.

Answer:

I will be glad to

Answer:

Instrumental Methods.

Explanation:

Compared to simple laboratory tests, instrumental methods of analysis may give improved: speed (they are quick) accuracy (they reliably identify elements and compounds) sensitivity (they can detect very small amounts of a substance in a small amount of sample)

Have a wonderful day! :-)

Answer:

Lithium                    Li                        3                 3                 4

Titanium                Ti                        22               22               26

Cobalt                   Co                      27                27               32

Silicon                    Si                       14                 14                14

Platinum                 Pt                      78                 78               117

Bromine                 Br                      35                 35               45

Nickel                     Ni                     28                  28               31

Manganese            Mn                   25                    25             30

Boron                      B                       5                     5                6

Oxygen                   O                       8                     8                8

Zinc                         Zn                      30                  30             35

Lead                        Pb                      82                   82            125

Explanation:

Can I have brainliest? This took me like an hour to find the answers and type the answers. TYSMMMMMMMMMMMMMMM  

Edit: I am also in 6th grade, but I looked it up because I haven't learned this yet.

Answer:

4 L or 4000 mL

Explanation:

This question asks for the use of combined gas law:

(P1)(V1) / (T1) = (P2)(V2) / (T2)

...where pressure (P) is in atm, volume (V) is in liters, and temperature (T) is in kelvin.

1000 ml is 1 L, and everything else is already in the right units.

(1 atm)(1 L) / (20 K) = (0.5 atm)(V2) / (40 K)

Just solve the equation for V2, and you get a new volume of 4 liters

(1)(1) / (20) = (.5x) / (40)

1 / 20 = .5x / 40

2 = .5x

x = 4

Explanation:

Mixture is physically combined while compound is chemically combined

Answer:

A mixture is physical, while a compound is chemical.

Explanation:

A mixture is a combination of two or more substances that are physically mixed together. The components of a mixture can be easily separated from one another by physical means, such as filtration or evaporation. The substances in a mixture retain their individual properties and do not chemically react with one another. For example, a mixture of salt and sand can be separated by dissolving the salt in water and then filtering the mixture to remove the sand particles. Each component of the mixture retains its own properties throughout the process.  On the other hand, a compound is a substance that is made up of two or more different elements chemically combined in fixed proportions. The components of a compound are held together by chemical bonds, resulting in a new substance with different properties from the original elements. Compounds cannot be easily separated into their individual components by physical means. For example, water (H2O) is a compound made up of hydrogen and oxygen. The elements hydrogen and oxygen chemically react to form water, and it is not possible to separate the hydrogen and oxygen in water by physical means alone.  In summary, a mixture is a physical combination of substances that can be easily separated, while a compound is a chemical combination of elements that cannot be easily separated. Mixture components retain their individual properties, while compounds have properties different from their component elements.

Answer:

Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions.

Explanation:

At pH 0, glutamate (C5H8NO4-) exists predominantly as an anion with a negative charge.

HOOC-CH2-CH2-CH(NH3+)-COO-

The carboxyl group (-COOH) on the left side of the molecule is deprotonated, resulting in a negatively charged carboxylate group (-COO-). The amino group (-NH2) on the right side of the molecule is protonated, carrying a positive charge (+NH3+). The central carbon atom is connected to the rest of the molecule with a single bond.

It's important to note that the pH of 0 is highly acidic, and glutamate is found in this charged form due to the low pH environment. In physiological conditions or at higher pH levels, glutamate will exist in different forms depending on the pH of the solution.

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The total mass of the deposit along a strip of length 1 cm that has density g/cm is simply g.

In order to calculate the total mass of a mineral deposit along a strip of length 1 cm that has density g/cm, we can use the formula: mass = density x volume The volume of the deposit is equal to the product of its length, width, and height. Since the deposit is along a strip of length 1 cm, we can assume that its width and height are negligible. Therefore, the volume of the deposit is approximately 1 cm³.

Substituting the density of the deposit in place of g/cm³, we can rewrite the formula as: mass = (density in g/cm³) x (volume in cm³)mass = g x 1 cm³mass = g To express the mass of the deposit in units of grams (g), we must know the value of the density in g/cm³. Once we know this value, we can multiply it by 1 cm³ to obtain the mass in grams.

For example, if the density of the deposit is 2 g/cm³, then the mass of the deposit is: mass = 2 g/cm³ x 1 cm³mass = 2 g Therefore, the total mass of the mineral deposit along a strip of length 1 cm that has density g/cm is simply g.

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To determine the value of ∆Hrxn for the reaction, we can use the equation:

∆Hrxn = q / n

where q is the heat of the reaction, n is the number of moles of reactants, and ∆Hrxn is the change in enthalpy of the reaction.

We can use the equation for calculating heat:

q = mc∆T

where q is the heat, m is the mass of the solution, c is the specific heat of the substance, and ∆T is the change in temperature.

The mass of the solution is equal to the volume of the solution times the density:

m = V * d

Plugging this equation into the equation for calculating heat, we get:

q = (V * d) * c * ∆T

We can use the values given in the problem to solve for q:

q = (0.200 L * 1.00 g/mL) * (4.18 J/g°C) * (23.48°C - 22.15°C)

q = 4.32 J

To determine the value of ∆Hrxn, we need to know the number of moles of reactants. The concentration of the HCl solution is 0.2 M, so the number of moles of HCl is:

n = (0.200 L) * (0.200 mol/L) = 0.040 mol

Plugging this value into the equation for ∆Hrxn, we get:

∆Hrxn = q / n = (4.32 J) / (0.040 mol) = 108 J/mol

Therefore,  ∆Hrxn=108 J/mol

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The fish would not survive because the amount of the oxygen corresponds only to 0.0047ppm.

We know that the ppm is one of the units that can be used to measure the concentration. Note that the ppm is the acronymn that stands for parts per million.

In this case, we have to note that the parts per million that we talking about in the problem that we have here is actually mL or oxygen per mL of water. We can see that in the case that we have, the amount of the oxygen is 0.0047 mL in 1L of water which is less than the threshold amount required.

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Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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Answer:

0.0188

Explanation:

using pv=nRt

where v--volume

p pressure

n number of moles

t temperature in kelvin

R molar gas constant=8.314atmmoldm^-3k^-1

4.972 × 9.583 =n × 8.314 × (31.8 + 273)

note I changed 31.8c to kelvin

making n subject of the formula

n=(4.972 × 9.583)/(8.314 ×(31.8 + 273)

n=(4.972 × 9.583)/(8.314 ×(304.8))

n=0.0188 moles

The estimated age of the rock is approximately 1.58 x 10^10 years.

To estimate the age of the rock based on the mass ratio of 208Pb to 232Th, we can use the concept of radioactive decay and the half-life of 232Th.

The ratio of 208Pb to 232Th in the rock represents the amount of 208Pb that has been formed through the radioactive decay of 232Th over time. Since one 208Pb atom is the final decay product of one 232Th atom, the mass ratio can be used to determine the fraction of 232Th that has decayed.

Given that the mass ratio of 208Pb to 232Th is 0.28/1.00, we can calculate the fraction of 232Th that has decayed as follows:

Fraction of 232Th decayed = (1 - mass ratio of 208Pb/232Th) = (1 - 0.28/1.00) = 0.72

The fraction of 232Th that has decayed corresponds to the fraction of the original amount of 232Th present in the rock. Using the concept of half-life, we can relate this fraction to the age of the rock.

Since the half-life of 232Th is 1.39 x 10^10 years, we can calculate the number of half-lives that have passed using the fraction of 232Th decayed:

Number of half-lives = log(base 0.5) (fraction of 232Th decayed)

Number of half-lives = log(base 0.5) (0.72) ≈ 1.14

The number of half-lives represents the time elapsed, and each half-life is equal to 1.39 x 10^10 years.

Therefore, the age of the rock can be estimated as:

Age of the rock = Number of half-lives x Half-life of 232Th

= 1.14 x 1.39 x 10^10 years

≈ 1.58 x 10^10 years

The estimated age of the rock is approximately 1.58 x 10^10 years.

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we write the empirical formula using the mole ratios as subscripts: Empirical formula of Calcocite = Cu2STherefore, the empirical formula for Calcocite is Cu2S.

Calcocite is a mineral composed of 79.9 mass % copper and 20.1 mass % sulfur. To determine the empirical formula for Calcocite, we must first determine the mole ratios of copper and sulfur in the mineral.

Here's how: Step-by-step explanation:

We assume a 100 g sample of Calcocite.

Then, the mass of copper in the sample is 79.9 g (79.9 mass % of 100 g) and the mass of sulfur in the sample is 20.1 g (20.1 mass % of 100 g).Next, we find the moles of copper and sulfur using their atomic masses:

Moles of copper = 79.9 g / 63.55 g/mol (atomic mass of copper)

= 1.257 moles Moles of sulfur

= 20.1 g / 32.06 g/mol (atomic mass of sulfur)

= 0.626 moles

Then, we divide each mole value by the smallest mole value to get the simplest whole-number ratio of moles:

Moles of copper / Smallest mole value

= 1.257 / 0.626

= 2.007 Moles of sulfur / Smallest mole value

= 0.626 / 0.626

= 1.000 (Note that we rounded off the mole ratio of copper to two decimal places, which may introduce some errors in our calculation.

However, we will use this rounded value to make our empirical formula easier to write.)

Finally, we write the empirical formula using the mole ratios as subscripts: Empirical formula of Calcocite = Cu2STherefore, the empirical formula for Calcocite is Cu2S.

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Answer:

D

Explanation:

The mass of salt in the tank after t minutes can be determined using the formula: Mass of salt = concentration of salt × volume of solution.

To find the mass of salt in the tank after t minutes, we need to multiply the concentration of salt by the volume of the solution. The concentration of salt is given as 0.03 kg/L, and the volume of the solution is given as kg. Therefore, the mass of salt can be calculated by multiplying 0.03 kg/L by kg.

The concentration of salt in the tank will reach 0.03 kg/L after minutes. This means that at this time, the amount of salt in the tank will be such that if it is divided by the volume of the solution, it will equal 0.03 kg/L. To calculate the time it takes for the concentration of salt to reach 0.03 kg/L, we need to divide the mass of salt by the volume of the solution and then multiply it by 1/L. This will give us the time in minutes.

In the second part of the question, a cold drink initially at 35°F warms up to 38°F in 3 minutes while sitting in a room of temperature 72°F. To find how warm the drink will be if left out for 30 minutes, we need to consider the rate at which the drink warms up and the time it is left out.

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The situation described can be solved using the combined gas law, which states:

(P1 x V1) / (T1) = (P2 x V2) / (T2)

Where P1, V1, and T1 are the initial pressure, volume, and temperature of the gas, respectively. P2, V2, and T2 are the final pressure, volume, and temperature of the gas, respectively.

To solve for the final temperature (T2), we can rearrange the equation as:

T2 = (P2 x V2 x T1) / (P1 x V1)

Let's plug in the given values:

P1 = 700 mm

P2 = 800 mm

V1 = V2 (since the volume is doubled)

T1 = 0°C + 273.15 = 273.15 K (converting to Kelvin)

So, we have:

T2 = (800 mm x 2V1 x 273.15 K) / (700 mm x V1)

T2 = (1600/7) x 273.15 K

T2 = 392.2 K

Therefore, the final temperature at which the volume of gas would be doubled, if the pressure increases from 700-800 mm and the gas is initially at 0°C, is approximately 392.2 Kelvin (which is approximately 119°C or 246°F).

15.15 mL of a 0.33 M NaCl solution is required to prepare 1.00 L of a 0.0050 M NaCl solution.

The equation for the molarity of a solution is given as:Molarity (M) = moles of solute / liters of solutionWe know that we have 1.00 L of a 0.0050 M NaCl solution, which means we have:moles of NaCl = Molarity × liters of solution= 0.0050 mol/L × 1.00 L= 0.0050 molSo we need to find how many milliliters (mL) of a 0.33 M NaCl solution contain 0.0050 mol of NaCl.To do this, we use the equation:moles of solute = Molarity × liters of solution

We can solve this equation for liters of solution

:Liters of solution = moles of solute / Molarity= 0.0050 mol / 0.33 mol/L= 0.01515 LWe need to convert this into milliliters:1 L = 1000 mL0.01515 L × 1000 mL/L ≈ 15.15 mLSo, to prepare 1.00 L of a 0.0050 M NaCl solution, we need 15.15 mL of a 0.33 M NaCl solution. Summary:To prepare 1.00 L of a 0.0050 M NaCl solution, we need 15.15 mL of a 0.33 M NaCl solution.

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Answer:

During gas exchange,oxygen moves into blood and carbon dioxide moves into the alveoli.

Its true

Explanation:

Hope its help

Cellular respiration can occur either anaerobically (without oxygen) or aerobically. Glucose and oxygen interact during aerobic cell respiration. As byproducts, both water and carbon dioxide are produced.

In the majority of cells, glycolysis turns glucose into pyruvate, which mitochondrial enzymes then oxidize to produce carbon dioxide and water. However, due to the absence of mitochondria in some platelets, most notably adult red blood mitochondria, glycolysis serves as the only method of ATP synthesis.

The carbon dioxide moves out of the circulation, via the capillaries, and onto the alveoli where it is ejected, while at the same time oxygen bonds with hemoglobin to be transported back to the tissues once the venous returns to the lungs.

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Answer: The mass of 0.004 moles of sodium hydrogensulfate is 0.568 g.

The mass of a substance can be calculated from the number of moles of the substance using the substance's molar mass. The molar mass of a substance is the mass of 1 mole of the substance, and it is typically measured in grams per mole (g/mol).

To find the mass of 0.004 moles of sodium hydrogensulfate (NaHSO4), we can use the substance's molar mass:

mass = (0.004 moles) x (142.08 g/mol)

mass = 0.568 g

So, the mass of 0.004 moles of sodium hydrogensulfate is 0.568 g. This is the mass of the substance when it is in the form of NaHSO4.

None of the given options is entirely correct.

With paper chromatography, mixtures of substances are separated according to how well they dissolve in a solvent and how well they stick to the paper's fibers.

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Answer:

The hydrolysis of an amide produces a carboxylic acid and ammonia or an amine.

Explanation:

Please mark brainliest! :)

To determine the \(Al_3^+:Ag^+\) concentration ratio in the electrochemical cell, the Nernst equation is used. By solving the equation, the ratio is found to be 1/27, which corresponds to option A (0.0094:1).

To determine the \(Al_3^+:Ag^+\) concentration ratio in the given electrochemical cell, we need to use the Nernst equation, which relates the cell potential (Ecell) to the concentrations of the species involved. The Nernst equation is given by:

Ecell = E°cell - (RT/nF) * ln(Q)

In this case, the balanced redox equation is:

\(Al(s) + 3Ag+(aq)\) → \(Al_3+(aq) + 3Ag(s)\)

The number of electrons transferred (n) is 3.

Since the reaction is at standard conditions (25°C), we can assume that E°cell = 0.59 V (retrieved from standard reduction potentials).

Plugging the values into the Nernst equation:

2.34 V = 0.59 V - (8.314 J/(mol·K) * (298 K) / (3 * 96485 C/mol) * ln(Q)

Simplifying the equation:

1.75 V = ln(Q)

Taking the exponential of both sides:

\(Q = e^{(1.75)}\)

Now, Q represents the concentration ratio of products to reactants. The ratio of \(Al_3^+\) to \(Ag^+\) is 1:3, based on the balanced equation. Therefore:

\(Q = [Al_3^+]/[Ag^+]^3 = 1/3^3 = 1/27\)

Comparing this to the options given, the closest ratio is 0.0094:1 (option A).

Therefore, the correct answer is A) 0.0094:1.

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