2. what is the concentration of a hydrochloric acid solution if 25.00 ml of it are exactly neutralized by 22.8 ml of a 0.300 m sodium hydroxide solution?

The moles of Al₂O₃ produced by the reaction of 200g of Al with O₂ is 3.7 . 4 moles of Al reacts with 3 moles of O₂ to produce 2 moles of Al₂O₃ according to the reaction.

A mole is exactly 6.022 × 10²³, which is the number of particles defined by Avogadro. For all intents and purposes, the mass of one mole of a substance in grams and the mass of one molecule in Daltons are essentially equivalent.

The amount of anything with the same number of particles as 12.000 kg of carbon-12 is known as a mole. Avogadro's Number is that number of particles, which is approximately 6.02 × 10²³. 6.02 × 10²³ carbon atoms make up a mole of carbon.

In the reaction:

4Al(s) + 3O₂(g) → 2Al₂O₃(s)

According to stoichiometry, 4 moles of Al reacts with 3 moles of O₂ to produce 2 moles of Al₂O₃.

Number of moles of Al;

Moles = \(\frac{200}{27}\) = 7.4 moles

4 moles of Al produce 2 moles of Al₂O₃.

So, the moles of Al₂O₃ produced by 7.4 moles of Al will be;

Moles = \(\frac{2}{4}\) × 7.4 = 3.7 moles of Al₂O₃.

To know more about stoichiometry, visit;

https://brainly.com/question/30215297

#SPJ1

These statements contradict each other, hence C is true if and only if one of the three statements is true

Think about the following: C=(p∧q∧¬r)∨(p∧¬q∧r)∨(¬p∧q∧r)

The outer disjunction () is used in this compound statement C, and it states that it is true if and only if one of the three propositions (p∧q∧¬r)∨(p∧¬q∧r)∨(¬p∧q∧r) is true.

First, it is not conceivable for two or three of these statements to be true at the same time. For instance, if  (p∧q∧¬r) and (p∧¬q∧r)are both true, then (r, from the first conjuncture) and (r, from the second conjuncture), respectively, are true, which is a contradiction. The same logic can be used to rule out any other possibility.

To learn more about Contradiction :

https://brainly.com/question/17439687

#SPJ4

Answer:

My Understanding:

Explanation:

2 Carbon, 7 Hydrogen, 1 Oxygen, 1 Hydrogen plus 2 Oxygen is the reactants of 1 Carbon, 2 Oxygen plus 2 Hydrogen, and 1 Oxygen.

Answer:



Explanation:

To calculate the number of moles in 60g of CO2, we first need to determine the molar mass of CO2, which is the sum of the atomic masses of carbon and two oxygen atoms:

M(C) + 2 × M(O) = 12.01 g/mol + 2 × 16.00 g/mol = 44.01 g/mol

The molar mass of CO2 is 44.01 g/mol.

We can use the molar mass to convert the mass of CO2 to moles:

moles = mass / molar mass

moles = 60 g / 44.01 g/mol

moles = 1.36 mol (rounded to two decimal places)

Therefore, there are 1.36 moles of CO2 in 60g of CO2.

Answer: s sub level ↔ first energy level

s and p sub levels ↔ second energy level

s, p, and d sub levels ↔ third energy level

Explanation:

As we know, s sub level is nearest to the nucleus and lies in 1st principal shell, while if we see s and p sub levels are lies in 2nd subshell and s,p and d sub levels are lies in 3rd principal shell.

the pressure of the gas increases

Answer:

The number of collisions of gas particles increases.

Explanation:

Just took the test!!!

The pH of a saturated solution of Zn(OH)2 is approximately 9. When Zn(OH)2 dissolves in water, it undergoes hydrolysis, releasing hydroxide ions (OH-) into the solution.

The hydroxide ions increase the concentration of OH- ions in the solution, making it basic. The pH scale ranges from 0 to 14, with 7 being neutral. Since the solution is basic, the pH will be greater than 7. Zn(OH)2 is a weak base, and its hydrolysis is not complete, resulting in a pH of around 9. In more detail, when Zn(OH)2 dissolves in water, it forms Zn2+ and OH- ions. The OH- ions, being a strong base, react with water to form more OH- ions, increasing the concentration of OH- in the solution. This leads to a basic pH. However, the hydrolysis of Zn(OH)2 is not complete, meaning not all of the Zn(OH)2 molecules dissociate into Zn2+ and OH- ions. Some Zn(OH)2 remains undissociated, contributing to the solution's slight acidity.

learn more about pH here:

https://brainly.com/question/2288405

#SPJ11

Answer: 0.19 M

Explanation:

The gram formula mass of HCl is 36.46 g/mol, so 35 grams of HCl is about 35/36.46 = 0.96 moles.

molarity = (moles of solute)/(liters of solution) = 0.96 / 5.0 = 0.19 M

Molarity (M) = 0.961 moles / 5.0 liters ≈ 0.1922 mol/L

The molarity of the solution is approximately 0.1922 mol/L or 0.1922 M.

To calculate the molarity (M) of the solution, we need to use the formula:

Molarity (M) = Number of moles of solute / Volume of solution (in liters)

Given that 35 grams of HCl are dissolved in 5.0 liters of water, we first need to find the number of moles of HCl using its molar mass.

The molar mass of HCl (hydrochloric acid) is the sum of the atomic masses of hydrogen (H) and chlorine (Cl):

Molar mass of HCl = 1.01 g/mol (H) + 35.45 g/mol (Cl) = 36.46 g/mol

Now, we can calculate the number of moles of HCl:

Number of moles = Mass of HCl / Molar mass of HCl

Number of moles = 35 g / 36.46 g/mol ≈ 0.961 moles

Finally, we can calculate the molarity of the solution:

Molarity (M) = 0.961 moles / 5.0 liters ≈ 0.1922 mol/L

The molarity of the solution is approximately 0.1922 mol/L or 0.1922 M.

To know more about molarity:

https://brainly.com/question/14828835

#SPJ2

Answer:

Water that falls from the clouds.

Explanation:

The mass of one mole of hydrogen gas (H₂) is 2 g/mol. Then, the mass of 18.06 moles of hydrogen gas is 36.12 g.

One mole of any substance contains 6.02 × 10²³ atoms. This number is called Avogadro number. Thus, one mole of every elements contains Avogadro number of atoms.

Similarly one mole of a compound contains Avogadro number of molecules. Hydrogen normally exists in the molecular state H₂ as hydrogen gas.

Molecular mass of H₂ = 2 g/mol.

given number of moles = 18.06 moles.

mass of hydrogen gas = number of moles × molecular mass

mass = 18.06 × 2 = 36.12 g.

Therefore, the mass of 18.06 moles of hydrogen gas is 36.12 g.

Find more on hydrogen gas:

https://brainly.com/question/11426882

#SPJ1

Answer:

A. An indicator added to the solution turns green-blue.

Explanation:

A pH scale measures the concentration of hydrogen ions in acidic and alkaline solutions.

In chemistry, pH literally means the power of hydrogen ions and it is a measure of the molar concentration of hydrogen ions in a particular solution; thus, specifying the acidity, neutrality or basicity of any chemical solution.

Mathematically, the pH of a solution is given by the formula;

\( pH = -log_{10}(H^{+}) \)

On a pH scale, a solution with a pH of 7 is neutral, a solution with a pH below 7 is acidic and it's basic (alkaline) when it's pH is above 7.

A pH indicator can be defined as a compound (substance) that indicates the concentration of hydrogen ions present in a solution by changing its color over a narrow range of pH values.

A pH range of 1 to 3 (1 - 3) represents a strong acid with a red color.

When an indicator added to a solution turns green-blue, it simply means that a weak base is present.

Answer:

1 ppm :)

Explanation: i was guessing and 1 ppm was the answer :)

Answer:

A nucleus is a positive charge

Explanation:

A nucleus is made up of protons and neutrons. Protons have a positive charge and neutrons have a neutral charge.

The purpose of the lab report is to investigate calorimetry and specific heat. Calorimetry is a technique used to measure the heat exchange in a system, while specific heat is the amount of heat energy required to raise the temperature of a substance by a certain amount. The lab aims to provide an opportunity to learn and apply scientific skills and concepts related to these topics.

In a calorimetry and specific heat lab, the primary objective is to measure and calculate the specific heat of a substance. This involves using a calorimeter to measure the heat exchange between the substance and its surroundings. By conducting controlled experiments and varying the variables, such as the mass and temperature of the substance, the relationship between heat transfer and temperature change can be observed and analyzed.

The lab report will likely include a detailed description of the experimental setup, the materials used, the data collected, and the calculations performed to determine the specific heat. It may also discuss any sources of error and propose ways to improve the accuracy of the results. The purpose of the lab is to develop an understanding of calorimetry principles, practice scientific measurement techniques, and apply the concept of specific heat in practical situations.

learn more about calorimetry  here:

https://brainly.com/question/1407669

#SPJ11

Answer:

Option 4

Explanation:

Answer:

Practice good personal hygiene. Wash your hands after removing gloves, before leaving the laboratory, and after handling a potentially hazardous material. While working in the laboratory, wear personal protective equipment - eye protection, gloves, laboratory coat - as directed by your supervisor.

Explanation:

Martin's statement is testable because it can be answered using an experiment. Option C.

Research questions are questions raised during observations. These questions are meant to be answered during the course of the research.

Thus, the experiment must be designed in such a way that all the questions raised during observations are answered by the results of the experiment.

Martin is asking how fast water and nutrients move up the stem of a carnation. A carnation is a plant.

The rate at which water and nutrients move up the stem of a plant is something that can be determined by performing a relevant experiment using the plant in question. This has actually been done in several experiments in the past.

Thus, the question asked by Martin is testable using an experiment.

More on research questions can be found here: https://brainly.com/question/25655057

#SPJ1

Answer: C

Explanation:

Because the environments in which they created change constantly, mass communication theories are said to be dynamic.

What are the four mass communication theories?

Authoritarian theory, libertarian theory, social responsibility theory, and soviet media theory are the "original" four theories of the mass communication.

Analysis of extensive information exchanges is the focus of the discipline of study known as mass communication. There are numerous theories of mass communication, all of which place emphasis on the speaker, media sources, audience, and other pertinent elements.

Theories of mass communication are important because they shed light on how people utilize, interact with, and distribute media. These theories offer a framework for comprehending the impact that the messages in media may have on audiences. For professionals in professions like marketing, broadcasting, journalism, or related ones, mass communication theories may be useful.

To learn more about mass communication use link below:

https://brainly.com/question/1186120

#SPJ4

Answer:

After the reaction, the total mass of the products must be D. Less than 10.0 grams

Answer:

C

Explanation:

APEX

the conclusions of an scientific experiment tell why the data support or reject the hypothesis. Thus option C is correct.

Scientific experiment involve asking different scientific questions, making hypothesis, design experiment, result and conclusion.

A good scientific experiment should have some facts which can be answered by using data analysis.

The types of scientific questions are Verification questions, Theory questions, Experimental questions

The verification question can be solved by collecting data from observation, which include characteristics or properties of a subject.

A theory question refers an imaginative exercise, is not fictional, depend on prior knowledge of the phenomenon being asking about.

The scientific question or an experimental question used to compare the element of a system when altered, it involves variables such as independent, dependent and controlled variables.

Thus option C is correct.

Learn more about scientific experiment, here:

https://brainly.com/question/1347425

#SPJ2

Given :

Half-life of Iodine , \(t_{0.5}=8 \ days\) .

Initial concentration , \([A_o]=100\ mg\) .

To Find :

The amount of sample remains after 32 days .

Solution :

Rate constant is given by :

\(k=\dfrac{0.693}{t_{0.5}}\\\\k=\dfrac{0.693}{8}\ s^{-1}\\\\k=0.086625\ s^{-1}\)

Now , by rate law :

\([A]=[A_o]e^{-kt}\)

Putting all given values, we get :

\([A]=100\times e^{-(0.086625)\times 32}\\\)

\([A]=6.25\ mg\)

Therefore , the remaining sample after 32 days is 6.25 mg .

Hence , this is the required solution .

Answer:The explanation is true

Directly proportional is like temperature and volume

V=kT  as Temp increases, volume increases

Inversely proportional is like pressure and volume

VP=k  as P increases, V decreases.

since wavelength time frequency is the speed of light,

wavelength and frequency are inversely proportional

lf=c

Explanation:

In electromagnetic waves, the frequency and wavelength are inversely proportional, which means if one gets larger, the other must get smaller. ...

The hybridization of the central carbon atom in CS₂ is Sp₂, and the approximate bond angle around the carbon is 107°.

Hybridization is a process by which two or more elements or compounds are combined to form a new substance with different properties. This process is widely used in chemistry to create new molecules and compounds. It can also be used to produce new varieties of plants and animals, and to create new materials and technologies. Hybridization can involve the combination of elements from different sources, such as combining molecules from different organisms to create new proteins.

Sp₂ hybridization involves the mixing of one s orbital and two p orbitals, which results in three sp₂ hybrid orbitals that are all in a plane and are arranged at 120° angles relative to one another. However, due to the presence of the two double bonds, the angle between them is compressed to 107°.

To learn more about hybridization

https://brainly.com/question/15088849

#SPJ4

The central carbon atom in CS2 is sp hybridized with an approximate bond angle of 180°.

The central carbon atom in CS2 is sp hybridized.

Carbon disulfide (CS2) is a linear molecule with two double bonds between carbon and sulfur atoms. In this molecule, the carbon atom undergoes sp hybridization, meaning that it mixes one s orbital and one p orbital to form two sp hybrid orbitals. The approximate bond angle around the carbon atom in CS2 is 180°.

https://brainly.com/question/32541376

#SPJ12

Answer: Yes it is

Explanation:

The movement of the continental plates is due to convection currents located at the Earth's mantle below the crust.

In conclusion, the movement of the continental plates is due to convection currents located at the Earth's mantle below the crust.

Learn more about the continental plates here:

https://brainly.com/question/10508547

Some of the desirable qualities in a germicide include rapid action, penetrating ability, and broad-spectrum action. The correct options are c, d and e.

Rapid action is important because it ensures that the germicide is able to quickly and effectively eliminate the target pathogen. Penetrating ability is also crucial because it allows the germicide to reach the target pathogen even if it is located deep within a surface. Broad-spectrum action is desirable because it means that the germicide is effective against a wide range of pathogens, which is particularly important in healthcare settings where different types of pathogens may be present.

On the other hand, it is not desirable for a germicide to be inactivated by organic matter, as this can reduce its effectiveness in the presence of bodily fluids or other organic substances. Narrow-spectrum action may also be less desirable, as it may only be effective against specific types of pathogens, limiting its usefulness in certain situations. Solubility in a solvent may be important depending on the intended use of the germicide, but it is not necessarily a primary desirable quality.

In summary, the most important desirable qualities in a germicide are rapid action, penetrating ability, and broad-spectrum action, while being inactivated by organic matter and having narrow-spectrum action may be less desirable.

To know more about germicide, refer to the link below:

https://brainly.com/question/13052271#

#SPJ11

The total heat energy required is expressed according to the formula:

where:

Qvap is the heat energy absorbed by the vapor

Qw is the heat energy absorbed by the water

Get the heat energy absorbed by the vapor at 100 degrees

Given the following parameters;

Mass of water = 100g

Molar mass of water (H2O) = 18.015g/mol

Hvap,w = 2259 J/g = 40.8 kJ/mol

Substitute the given parameters into the formula to have:

Get the heat absorbed by the water from 30 to 100 degrees and from 100 to 110 degrees using the formula below. Note that the water vapor is being heated without any phase changes, so we will be utilizing the specific heat capacity of water vapor.

Get the total heat energy required;

Explanation:

cooling

communication

heating

motion

Answer:

I believe it's all of the above

Explanation:

Because heating and cooling can be done by an AC unit, which takes electricity. Communication also takes electricity, along with lighting (especially if we're talking light fixtures to light up homes). Not to mention motion, such as cars and other transportation uses, believe it or not, electricity.

Hope this helped, also please tell me if I'm wrong.