A student is collecting data for the reaction of baking soda and vinegar. The initial temperature of the vinegar is 25˚ C and the final temperature of the reaction is 19˚ C. Identify the reaction as endothermic or exothermic and explain what is happening in terms of energy of the systems and the surroundings.

Mass of sulphur present in sample of Na2S2O3 (Sodim Thiosulphate) weighing 33.6 g would be 13.60g

Atomic mass of sulfur: 32g

Sulfur present in 1 molecule of Sodium thiosulphate: 2 atoms

Mass of sulfur in 1 mole of Sodium thiosulphate :

2 * atomic mass of sulphur

2 * 32 = 64g

Which means 158.1 g of Sodium Thiosulfate has 64 grams of sulfur in it...
We're given 33.6 g of sodium thiosulfate which will contain :

(33.6 * 64) / 158.1g = 13.60 g of Sulfur

Pityriasis versicolor, cyanide poisoning, and cisplatin side effects are all treated using sodium thiosulfate, also known as sodium thiosulphate.

To know more about Sodium Thiosulphate :

brainly.com/question/20703431

#SPJ4

We can see that the pressure of the gas has remained the same. Therefore, the answer is: It has stayed the same.

According to the Ideal Gas Law, PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is the absolute temperature.

If the volume of a fixed amount of gas is doubled, and the absolute temperature is doubled, then the new values of volume and temperature are V' = 2V and T' = 2T, respectively.

Using the Ideal Gas Law, we can write:

P'V' = nRT'

Substituting V' and T' and rearranging:

P' = (nRT') / V'

P' = (nR x 2T) / (2V)

P' = P

For more question on pressure click on

https://brainly.com/question/24719118

#SPJ11

Answer:

the answer is true

Explanation:

the reason why is because if you look at it a chemical in a repeating form os a compound so that means it is the same properties for food.

Answer:

True

Explanation:

Many different species eat grass, and rabbits can eat other plants besides grass. Foxes, in turn, can eat many types of animals and plants. Each of these living things can be a part of multiple food chains.

There are 6 number of valence electrons in the electron-dot structure of H₂O.

Water (H₂O) is a compound that has a molecular structure. In an electron dot diagram, the valence electrons in the outermost energy level of an atom are depicted as dots. The diagram depicts how the valence electrons are shared in a covalent bond.

Valence Electrons-

The electrons present in the outermost shell of an atom are called valence electrons. These electrons play an essential role in chemical bonding since they are responsible for the chemical reactivity of an atom.

The valence electrons are represented in the electron-dot structure with dots. In an electron dot diagram, the valence electrons in the outermost energy level of an atom are depicted as dots.

The electron dot structure of H₂O is:

Electron dot structure of H₂O molecule consists of two electrons of hydrogen and four electrons of oxygen.

Therefore, the total number of valence electrons in H₂O is 6.

Learn more about the valence electrons from the given link-

https://brainly.com/question/371590

#SPJ11

The initial pH of the solution is 1.76.

To learn more about The initial pH of the solution refer to:

https://brainly.com/question/30140546

#SPJ1

Answer:

56160grams

Explanation:

First, we need to convert the number of molecules of magnesium chloride (MgCl2) into moles by dividing by Avagadro's number (6.02 × 10^23 molecules)

n = nA ÷ 6.02 × 10^23

n = 14.07 × 10^26 ÷ 6.02 × 10^23

n = 14.07/6.02 × 10^(26-23)

n = 2.34 × 10^3 moles of MgCl2

The balanced reaction given in the question is as follows:

Mg + 2HCl → MgCl2 + H2

If 1 mole of Mg produced 1 mole of MgCl2

Then, 2.34 × 10^3 moles of Mg will also produce 2.34 × 10^3 moles of MgCl2.

Using mole = mass ÷ molar mass (MM)

Molar mass of Mg = 24g/mol

mass = mole × MM

mass = 2.34 × 10^3 × 24

mass = 56.16 × 10^3

mass = 56160grams.

Answer:

B

Explanation:

I know but I can't answer well. We might to choose the best answer so the answer is possible to be B.

First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

To learn more about copper here

https://brainly.com/question/13677872

#SPJ1

The Ka of formic acid is 1.54 x 10-4.

To calculate the Ka of formic acid, we can use the formula for Ka. Ka = [H+] [HCOO-]/[HCOOH]The value of [H+] can be calculated by taking the antilogarithm of -2.37 which comes out to be 5.01 x 10-3. Molar concentration of formic acid = 0.0272/0.25 = 0.1088The value of [HCOO-] is equal to [H+]. Therefore, [HCOO-] = 5.01 x 10-3M. Substituting the values in the above equation, we get the value of Ka as 1.54 x 10-4. Therefore, the correct option is C. 1.54 x 10-4.

The simplest carboxylic acid is formic acid, which only has one carbon. Is a useful organic synthetic reagent that occurs naturally in a variety of sources, including the venom of bee and ant stings. primarily utilized in livestock feed as a preservative and antibacterial agent.

Know more about formic acid, here:

https://brainly.com/question/28562918

#SPJ11

The time it takes for the ejected electrons to travel 2.75 cm to the detection device is approximately 2.165 ns.

To determine the time it takes for the ejected electrons to travel a distance of 2.75 cm to the detection device, we need to calculate their speed first. We can use the energy of the incident photons and the work function of the material to find the kinetic energy of the ejected electrons, and then apply the classical kinetic energy equation. Assuming the electrons have negligible initial velocity:

1. Calculate the energy of the incident photons:

Energy = hc / λ

where:

h is Planck's constant (6.626 x 10⁻³⁴ J·s),

c is the speed of light (3 x 10⁸ m/s),

λ is the wavelength of the photons (487 nm).

Converting wavelength to meters:

λ = 487 nm = 487 x 10⁻⁹ m

Substituting the values into the equation and converting to electron volts (eV):

Energy = (6.626 x 10⁻³⁴ J·s × 3 x 10⁸ m/s) / (487 x 10⁻⁹  m) = 4.065 eV

2. Calculate the kinetic energy of the ejected electrons:

Kinetic Energy = Energy - Work Function

where the work function is given as 2.43 eV.

Kinetic Energy = 4.065 eV - 2.43 eV = 1.635 eV

3. Convert the kinetic energy to joules:

1 eV = 1.6 x 10⁻¹⁹  J

Kinetic Energy = 1.635 eV × (1.6 x 10⁻¹⁹ J/eV) = 2.616 x 10⁻¹⁹ J

4. Apply the classical kinetic energy equation:

Kinetic Energy = (1/2) × m × v²

where m is the mass of the electron and v is its velocity.

Rearranging the equation to solve for velocity:

v = √(2 × Kinetic Energy / m)

The mass of an electron, m = 9.11 x 10⁻³¹ kg.

Substituting the values and calculating the velocity:

v = √(2 × 2.616 x 10⁻¹⁹ J / 9.11 x 10⁻³¹ kg) ≈ 1.268 x 10⁷ m/s

5. Calculate the time to travel 2.75 cm:

Distance = 2.75 cm = 2.75 x 10⁻² m

Time = Distance / Velocity = (2.75 x 10⁻² m) / (1.268 x 10⁷ m/s) ≈ 2.165 x 10⁻⁹ seconds

Converting to nanoseconds:

Time ≈ 2.165 ns

Therefore, it will take approximately 2.165 nanoseconds for the ejected electrons to travel 2.75 cm to the detection device.

Read more about Kinetic Energy here: https://brainly.com/question/8101588

#SPJ11

Answer:

Only Hydrogen and Group 1 elements have 1 valence electron

Explanation:

the valence number of electrons is the group number in the periodic table. So, the group 1 atoms( along with hydrogen) have 1 outer-shell electrons [valence electrons]

The part of speech for each word or phrase that is not concise science writing are: adjective, adverb, adjective respectively.

Apart from written communication in everyday life, writing is considered the cornerstone of scientific communication. In a scientific article, concise writing is always a key feature. Hence the answer to the question is an adjective, adverb, adjective respectively.

Concise writing, according to the question, means using only the words needed to convey an idea in a simple and understandable way. In science writing, it is more critical since it involves expressing complicated concepts in straightforward language without losing the underlying scientific message.

For instance, in the given question, each of the three phrases: bright as a summer day, gracefully, and lovely are not concise science writing since they represent an excess in the usage of language. Therefore, they do not adhere to the rules of conciseness in writing.

To know more about part of speech click on below link:

https://brainly.com/question/12011328#

#SPJ11

Answer:

Explanation:

its b i did this i k its gonna be right

Among the given options, the form that would not insure against external explosion is d) unendorsed DP-1.  option d

To understand why, let's first clarify the terms used in the options. DP stands for Dwelling Property, which is a type of insurance policy that covers residential properties. The numbers 1, 2, and 3 refer to different forms or levels of coverage provided by the insurance policy.

In the case of an external explosion, it typically refers to an explosion that occurs outside the insured property and causes damage to the property. This can include explosions from nearby buildings, gas leaks, or other external sources.

Now, looking at the options:

a) Endorsed DP-1: This indicates that the DP-1 policy has been endorsed or modified to include additional coverage. Depending on the specific endorsement, it may or may not cover external explosions. Therefore, it is possible that an endorsed DP-1 could provide coverage against external explosions if the endorsement includes such coverage.

b) DP-2: The DP-2 form is a broader form of coverage compared to DP-1. It typically covers a wider range of perils, including external explosions. Therefore, DP-2 is more likely to provide coverage against external explosions.

c) DP-3: The DP-3 form is the broadest and most comprehensive form of coverage among the three. It typically covers a wide range of perils, including external explosions. Therefore, DP-3 is likely to provide coverage against external explosions

d) Unendorsed DP-1: This refers to a standard DP-1 policy without any additional endorsements or modifications. The unendorsed DP-1 policy is typically the most basic form of coverage and may have limited coverage options. It is less likely to include coverage for external explosions unless specifically mentioned in the policy.

Option d

For more such question on explosion visit:

https://brainly.com/question/29482908

#SPJ8

Respuesta:

1.50 moles

Explicación:

Paso 1: Escribir la ecuación química ajustada para la descomposición del carbonato de calcio

CaCO₃ ⇒ CaO + CO₂

Paso 2: Calcular los moles correspondientes a 150 g de CaCO₃

La masa molar de CaCO₃ es 100.09 g/mol.

150 g × 1 mol/100.09 g = 1.50 mol

Paso 3: Calcular los moles de CO₂ producidos a partir de 1.50 moles de CaCO₃

La relación molar de CaCO₃ a CO₂ es 1:1.

1.50 mol CaCO₃ × 1 mol CO₂/1 mol CaCO₃ = 1.50 mol CO₂

The possible values of the quantum numbers are:

Orbital shape quantum number l: 0, 1, 2, 3, 4, or 5.

Magnetic quantum number m: -l to +l.

Spin quantum number, s: +1/2 or -1/2.

For the principal quantum number n = 6, the possible values of the azimuthal (orbital shape) quantum number l are 0, 1, 2, 3, 4, and 5.

The magnetic quantum number m can have values ranging from -l to +l, inclusive.

The spin quantum number, s can be either +1/2 or -1/2.

So, the valence electrons in an atom with principal quantum number n = 6 can have the following quantum numbers:

Azimuthal quantum number, l can be 0, 1, 2, 3, 4, or 5.

Magnetic quantum number, m can range from -l to +l, inclusive.

Spin quantum number, s can be either +1/2 or -1/2.

Learn more about quantum numbers at: https://brainly.com/question/2292596

#SPJ1

The temperature at which reactions with ΔH = -126 and ΔS = 84 become spontaneous is 271.65 K or -1.5 degree celsius.

To explain why, we must first examine the relationship between ΔH, ΔS, and temperature.

The Gibbs free energy change, ΔG, is given by the equation ΔG = ΔH - TΔS, where T is the temperature in Kelvin.

If ΔG is negative, the reaction is spontaneous; if it is positive, the reaction is non-spontaneous; and if it is zero, the reaction is at equilibrium.

We can rearrange this equation to solve for T and find the temperature at which the reaction becomes spontaneous:

ΔG = ΔH - TΔS < 0

ΔH - TΔS < 0

TΔS > ΔH

T > ΔH/ΔS

The temperature at which the reaction becomes spontaneous is greater than ΔH/ΔS.

Given: ΔH = -126, ΔS = 84

T > ΔH/ΔS

T > -126/84

T > -1.5 or T > 271.65 K.

Thus, the temperature at which reactions with ΔH = -126 and ΔS = 84 become spontaneous is 271.65 K or greater than this temperature.

To learn more about ΔG, visit the following link:

https://brainly.com/question/28301494

#SPJ11

Answer:

the answer is B because it is a chemical reaction

The mutated amino acid at position 229 is arginine (Arg), and its substitution can potentially disrupt the 3D structure and alter the function of the protein due to changes in side chain properties and interactions.

Structure of the Amino Acids:

The wild-type amino acid at position 229 is not specified, so the structure cannot be provided.

The mutated amino acid is arginine (Arg), which has a side chain containing a positively charged guanidinium group.

Importance of the Position:

The specific position 229 in the protein sequence may be functionally significant, such as being involved in protein-protein interactions, binding sites, catalytic activity, or structural stability.

Without detailed knowledge of the protein, its function, and its structural context, it is difficult to determine the exact importance of this specific position.

Effects of the Mutation on Structure and Function:

The substitution of an amino acid at position 229 from the original to arginine can have various effects on protein structure and function.

Arginine's larger and positively charged side chain may introduce steric clashes or alter electrostatic interactions within the protein structure.

The mutation can potentially disrupt local or global protein folding, stability, or conformational changes, affecting its overall 3D structure.

The functional consequences of the mutation depend on the specific role of the amino acid at position 229, which can include changes in protein-protein interactions, enzymatic activity, substrate binding, or signal transduction pathways.

It is crucial to analyze the protein's structural context, available experimental data, and computational modeling techniques to gain a more accurate understanding of the specific effects of the mutation on the protein's structure and function in the given context.

Learn more about Amino Acids from the given link:

https://brainly.com/question/31872499

#SPJ11

Answer:

The corect answer would be C.

Explanation:

The flow rate set at a differentt time would be the correct measurement beecause wats and speed add up to your main answer.

Answer:

See image

Explanation:

Answer:

yes your answer is correct for this question.

Answer: A. They were traveling through different types of rocks

Explanation:

It is more difficult to precipitate cupric acetate (verdigris) than cupric carbonate hydroxide (malachite) is due to the solubility of the compounds. Cupric acetate is more soluble in water compared to cupric carbonate hydroxide.

Cupric acetate requires a higher concentration of the precipitating agent to effectively precipitate cupric acetate. In addition, the formation of malachite involves a chemical reaction between copper ions and carbonate ions in the presence of hydroxide ions, which leads to the formation of a solid precipitate. On the other hand, the formation of verdigris involves the reaction between copper ions and acetic acid to form a complex compound, which makes it more difficult to precipitate.

To learn more about malachite https://brainly.com/question/28200812

#SPJ11

The following chemical equation 2C8H18(g)+ 25O2(g)→ 16CO2(g)+ 18H2O(g) is balance and 48.64 grams of oxygen is required in the combustion of octane in gasoline.

When burning of petrol happens and releases toxic hydrocarbons and carbon dioxide gasses with some amount of oxygen is known as combustion.

The balanced chemical equation is 2C8H18(g)+ 25O2(g)→ 16CO2(g)+ 18H2O(g),

                      number of moles = mass / molar mass

substituting the value in equation,

                      number of moles = 14 / 114g = 0.122 moles.

number of moles of oxygen 0.122 × 0.122 moles. = 1.52 moles.

                    1.52 = mass / 32

                      mass = 48.64 gram.

Therefore,48.64 grams of oxygen is required in the combustion of octane in gasoline.

Learn more about combustion, here:

https://brainly.com/question/13153771

#SPJ1

The balanced chemical equation would be as follows,

C8H18(g)+12.5 O2(g)→ 8 CO2(g)+ 9 H2O(g)

105.26  grams of oxygen are required to react with 14.0 grams of octane ( C8H18 ) in the combustion of octane in gasoline.

A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products

The balanced chemical equation would be as follows,\

C8H18(g)+12.5 O2(g)→ 8 CO2(g)+ 9 H2O(g)

114 grams of octane ( C8H18 ) require 400 grams of oxygen

1 gram of octane requires 400/114 grams of oxygen

30 grams of octane require 400/114×30 grams of oxygen

30 grams of octane require 105.26  grams of oxygen

Thus,105.26  grams of oxygen are required to react with 14.0 grams of octane ( C8H18 ) in the combustion of octane in gasoline.

Learn more about chemical reactions here,

brainly.com/question/22817140

#SPJ1

Looking for evidence entails careful study. The answers to the question is below;

The crime that Mr. Fraser describes is drive-by killing.

The police select their suspect by the act of showing pictures to one of the teenagers and thereafter they the suspect out, the suspect the saw that shoot the father.

The fact was that there was no evidence since they did not find the gun and the car used in the crime was not identified. Even the suspect vehicle (shooter) was not identified also.

The approximate figure is about 252 out of 367 cases of wrongful conviction have been identified. That is 69% of DNA exonerations. Others about 250-285 cases.

The National Registry of Exonerations has stated that about 450 non-DNA-based exonerations  where there was eyewitness misidentification. That is about 3 quarters have eye witness testimonies.

Reconstructive memory is simply known as the act of remembering that involves the reproduction of an experience or event that is known to be partially stored in memory before.

Fraser challenged the judge to go out and inspect the crime scene themselves.

The outcome of the challenge was that the judge thereby granted the retrial for Francisco Carrillo and thus released him so he can prepare his defense before the prosecution day.

Mr. Fraser suggested that people learn to be more effective with how they handle things or situations so as to get the right evidence and also that people be more cautious about how true some eyewitness testimonies may be.

Learn more about this case from

https://brainly.com/question/24612601

3) orbitals can hold two electrons provided they are spinning in the same direction

We define an orbital in chemistry as a region in space where there is a high probability of finding an electron.

Each orbital holds a maximum of two electrons which spin in opposite direction according to Pauli exclusion principle.

According to this principle no two electrons can have the same set of quantum numbers. As a result, the spin quantum numbers of two electrons in the same orbital must differ hence they spin in opposite directions.

https://brainly.com/question/19536139

Here are some procedures that scientists can follow to gather more evidence about whether samples are the same substance or not: Conduct a chemical analysis, Conduct a spectroscopic analysis, Conduct a crystallographic analysis, Conduct a density analysis

Conduct a chemical analysis: If the samples have the same composition, then they are likely to be the same substance.

Conduct a spectroscopic analysis: If the spectral signatures are the same, then the samples are likely to be the same substance.

Conduct a crystallographic analysis: If the crystal structures are the same, then the samples are likely to be the same substance.

Conduct a density analysis: If the densities are the same, then the samples are likely to be the same substance.

To know more about spectral signatures, here

brainly.com/question/22636286

#SPJ1