What is the volume of NaOH used in each Titration??​

Answer:

The breaking of chemical bonds never releases energy to the external environment. Energy is only released when chemical bonds are formed. In general, a chemical reaction involves two steps: 1) the original chemical bonds between the atoms are broken, and 2) new bonds are formed. These two steps are sometimes lumped into one event for simplicity, but they are really two separate events. For instance, when you burn methane (natural gas) in your stove, the methane is reacting with oxygen to form carbon dioxide and water. Chemists often write this as:

CH4 + 2 O2 → CO2 + 2 H2O + energy

Explanation:

here is the answer

Answer:

C) A constant that states how many atoms/molecules are in one mole of anything

Explanation:

Avogadro's number like the name suggests is a constant that states how many atoms/molecules are in one mole of anything.

Water is an essential part of life and its availability is important for all living creatures. On the other side, the world is suffering from a major problem of drinking water. There are several gases, microorganisms and other toxins (chemicals and heavy metals) added into water during rain, flowing water, etc. which is responsible for water pollution. This review article describes various applications of nanomaterial in removing different types of impurities from polluted water. There are various kinds of nanomaterials, which carried huge potential to treat polluted water (containing metal toxin substance, different organic and inorganic impurities) very effectively due to their unique properties like greater surface area, able to work at low concentration, etc. The nanostructured catalytic membranes, nanosorbents and nanophotocatalyst based approaches to remove pollutants from wastewater are eco-friendly and efficient, but they require more energy, more investment in order to purify the wastewater. There are many challenges and issues of wastewater treatment. Some precautions are also required to keep away from ecological and health issues. New modern equipment for wastewater treatment should be flexible, low cost and efficient for the commercialization purpose.

Answer:

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Explanation:

dnnxjxkxjxjndnfncjcshndnsbsnnsnssbsnsnsnsndndndnx

Answer:

it's none because the graph is decreasing like a milf so that why

Answer:

sana nakatulong po sainyo

Answer:

The estimated atomic of silicon is 28.082 a.m.u.

Explanation:

The estimated atomic mass of silicon ([tex]M_{Si, est}[/tex]), in a.m.u., is equal to the weighted average of atomic masses of silicon available in nature and in terms of their abundances:

[tex]M_{Si, est} = r_{1}\cdot M_{Si-28} + r_{2} \cdot M_{Si-29} + r_{3}\cdot M_{Si-30}[/tex] (1)

Where:

[tex]r_{1}[/tex], [tex]r_{2}[/tex], [tex]r_{3}[/tex] - Relative abundance of each isotope, no unit.

[tex]M_{Si-28}[/tex], [tex]M_{Si-29}[/tex], [tex]M_{Si-30}[/tex] - Atomic mass of each isotope, in a.m.u.

If we know that [tex]M_{Si-28} = 27.976\,a.m.u.[/tex], [tex]M_{Si-29} = 28.976\,a.m.u.[/tex], [tex]M_{Si-30} = 29.974\,a.m.u.[/tex], [tex]r_{1} = \frac{92.22}{100}[/tex], [tex]r_{2} = \frac{4.68}{100}[/tex] and [tex]r_{3} = \frac{3.09}{100}[/tex], then the estimated atomic mass of silicon is:

[tex]M_{Si, est} = r_{1}\cdot M_{Si-28} + r_{2} \cdot M_{Si-29} + r_{3}\cdot M_{Si-30}[/tex]

[tex]M_{Si,est} = \left(\frac{92.22}{100} \right)\cdot (27.976\,a.m.u.) + \left(\frac{4.68}{100} \right)\cdot (28.976\,a.m.u.) + \left(\frac{3.09}{100} \right)\cdot (29.974\,a.m.u.)[/tex]

[tex]M_{Si, est} = 28.082\,a.m.u.[/tex]

The estimated atomic of silicon is 28.082 a.m.u.

Answer:

D.

HCl is acid

Ca(OH)2 is base

CaCl2 is salt

In the given chemical equation Ca(OH)2 is the base and CaCl2 is the salt, thus  option D is correct.

A chemical equation is a symbolic representation of a chemical reaction that shows the products, reactants, and direction of the reaction.

An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.

A base is a chemical species that donates electrons, accepts protons, or releases hydroxide (OH-) ions in aqueous solution.

A salt, in chemistry, is defined as the product formed from the neutralisation reaction of acids and bases.

Therefore,  in this chemical  equation  option D is true about the equation i.e

Ca(OH)2 is the base and CaCl2 is the salt.

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Answer:

C

I am pretty sure that is the answer

The mass of the given cube of 173.7g and the volume of the box is 9 cm³.Then the density is 19.3 g/cm³. Therefore, the element with this density is gold. Option D is correct.

Density of a substance is the ratio of mass to its volume. Thus it tells about how much denser the substance is in the given volume. This physical quantity is dependant on mass, volume temperature and pressure.

The element have their own density corresponding to the mass and volume used. The dimensions of the given box is 3, 3 and 1. Thus volume is the product of this length, breadth and height.

Volume = 3 ×3 × 1

             = 9 cm³.

Mass of the box is given 173.7 grams. Now, the density of the element is calculated as follows:

Density = 173.3 /  9 cm³

             = 19.3 g/cm³.

From the table, it is clear that the this density corresponds to the element gold. Therefore, option D is correct.

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Answer:

The correct answer is :

         a silver nitrate solution (AgNO3) is mixed with a solution of magnesium bromide (MgBr2). The balanced reaction would be: 2 AgNO3(aq) + MgBr2 --> 2 AgBr + Mg(NO3)2

the last one

Answer:

B) Cu2+ + 2e– → Cu.

Explanation:

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In this case, in the regard of redox reactions, we must keep in mind that half-reactions show us how the flow of electrons when an element undergoes a change in its oxidation state, say increasing or decreasing. In such a way, if the element is oxidized, increase the oxidation state, we add electrons on the right side and the contrary if the element is reduced, decrease the oxidation state.

In such a way, we can see that the reaction B) Cu2+ + 2e– → Cu, shows how the Cu2+ cations are reduced by adding electrons to produce Cu and thus, conserve the charge.

Best regards!

Answer:

i think 554 I think

Explanation:

maybe ..

Answer:   A process of cooking food in a pot made from unglazed and natural clay. coddling: Heating food in water kept just below the boiling point.

Explanation:

Answer:

diffusion: the movement of molecules in a solution from an area of

higher concentration to an area of lower concentration

Diffusion is the movement of particles from where there are more to where there are less. This movement occurs until particles are evenly spread out. While diffusion can be seen in all states of matter, it is most common in liquids and gases.

Answer:Any acid that dissociates 100% into ions is called a strong acid. If it does not dissociate 100%, it is a weak acid.

Explanation:acid. (d) Water can act as a Brønsted-Lowry base. ... (b) Give the conjugate acid of the following Brønsted-Lowry bases: ... 16.21 Label each of the following as being a strong base, a weak base, or a species with ... (C) NH Weak base, Netyt is a weak acid ... CHz Lo0H is stronger acid than Hys, so equilibrinus lies to right.

Answer:

C

Explanation:

I think it is a ever lasting process of pain and happiness cause the ones that are closest to you can make it hurt most but they can also make your day So probably

Answer:

7178.22 mL

Explanation:

Applying,

PV = P'V'................. Equation 1

Where P = Initial pressureof gas, V = Initial volume of gas, P' = Final pressure of gas, V' = Final volume of gas.

make V' the subject of the equation

V' = PV/P'.............. Equation 2

From the question,

Given: V = 2250 mL, P = 290 kPa, P' = 0.9 atm = (101×0.9) = 90.9 kPa

Substitute these values into equation 2

V' = (2250×290)/90.9

V' = 7178.22 mL

Answer:

Paleoclimatology

Step by Step explanation:

is the study of climate records from hundreds to millions of years ago. Information for paleoclimate studies come from natural records rather than instruments: these indirect records of climatic conditions are called proxy records. Coring a tree to gain access to tree ring data.

Answer:

Chemistry

Explanation:

Chemistry is considered the central science.

Chemistry is sometimes called "the central science" because it's so important to other fields of science, like biology, geology, astronomy, physics, medicine, engineering, materials science, and many other areas of study.

All the branches of science possess their own level of importance, However, physics deals with the fundamental workings of material reality which are central to all other branches of science.

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Answer:

The correct answer is - reduce carbon emission, decrease deforestation snd increase plantation, use renewable energy.

Explanation:

Global warming is the process that is caused by human activities to increase the temperature of the earth. It increases the heat of the climate of the earth that leads to a negative impact on the environment. Increasing the greenhouse gas emission leads to trapping heat and cause global warming.

The three major solutions are:

1. reduce carbon and greenhouse gases: The main cause of global warming is the emission of greenhouse gases and an increase in carbon in the atmosphere, so reduce these gas emissions by avoiding fossil fuels that release carbon.

2. reduce deforestation and increase the plantation: trees take carbon dioxide from the environment, So prevent them from cutting and planting new trees will help reducing carbon from the environment.

3. Using renewable energy will help them to not depend on fossil fuels or water waste that will help in reducing global warming.

Answer:

A. their cells contain a nucleus

Explanation:

hope it helps

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Answer:

An increase in temperature typically increases the rate of reaction because an increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision.Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions. It is only these collisions (possessing at least the activation energy for the reaction) which result in a reaction.

Explanation:

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Answer:

96.3g is the actual yield from this reaction

Explanation:

Have been 113g...

The percent yield of a reaction is defined as one hundred times the ratio between actual yield (Our incognite) and the theoretical yielf (113g). The equation is:

Percent yield = 85.22% = Actual Yield / 113g * 100

0.8522 = Actual Yield / 113g

0.8522*113g =

96.3g is the actual yield from this reaction

Answer:

96.3

Explanation:

Just took the test

Explanation:

                 Two advantage of Tourist Industry:

Tourism is one of the largest and fastest growing industry in terms of generating more revenues, providing Large number of employment opportunities and only one major ways to development the nation within short spam of time. There are so many facts that, tourism helps making the country renowned all over the world and is called only one weapon to make country strong as from all the aspects.

Although, as we all know that, there are several facts and data's which shows that tourism is only one largest industry throughout world that generated huge amounts of Money than others. So what are the advantages of tourism? Which can be pointed out as following :-

1. Tourism helps to generate more revenues in the country.

2. The tourism can change the nation within a short time period.

3. Tourism helps to provide more numerous kinds of human resources in the nation.

4. Tourism is only one way to develop and to make renowned in the world

Answer:  5 plates

Explanation:

Because you have 5 sandwiches total

5 plates are the theoretical yield. Hence, option C is correct.

The theoretical yield is the maximum possible mass of a product that can be made in a chemical reaction.

The actual yield is the result obtained from the experiment while the theoretical yield is the result obtained from our calculations.

The actual yield of a chemical reaction rarely equals the theoretical yield because some of the amounts are lost during the process.

5 plates are the theoretical yield.

Hence, option C is correct.

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Answer:

NaOH+ N2O3---> NaNO2 + H2O

Answer:

x = 2, [tex]CH_{4} + 2O_{2} = CO_{2} + 2H_{2}O\\[/tex]

Explanation:

This question is related to balancing chemical equations.

[tex]CH_{4} + xO_{2} = CO_{2} + 2H_{2}O\\[/tex]

- There must be the same amount of carbons (C), hydrogens (H), and oxygens (O) on each side of the equals sign.

- There is already 1 carbon and 4 hydrogens on each side of the equals sign. The big number in front of the chemical compound multiplies into the individual elements and can be multiplied by the subscripts to get the total number of each element.

- On the right side of the equation, there are 4 oxygens (O), and on the left side, there are 2. In order for there to be 4 oxygens (O) on the left side, there must be a 2 in front of [tex]O_{2}[/tex].

Therefore, x = 2.

[tex]CH_{4} + 2O_{2} = CO_{2} + 2H_{2}O\\[/tex]