Which is a disadvantage of using chemical indicators? they are expensive to use. they measure ph directly. they must be selected for a narrow ph range. they do not use electricity to operate.

Answer:

tap water Is the pure substance

Answer:

Ethanol is pure

Explanation:

Purity meaning homogenious molecules/atoms, steel is a mix of iron and carbon, tapwater has minerals in it + fluoride etc, petrol has oxane and ethanol in it. ethanol is only ethanol and is inherently pure

Answer:

iron

Explanation:

has more magnetic metal

Between iron and copper metals, iron is more active than copper metal as it is present above Co in the electrochemical series.

Electrochemical series is a type of reactivity series in which metals are arranged from bottom to the top in the increasing order of their reactivity.

As we know that reactivity is directly proportional to the activity of any element. In the electrochemical series iron is situated at the top position as compared to the copper metal.

So, iron is more active.

To know more about electrochemical series, visit the below link:

https://brainly.com/question/3066473

#SPJ4

The structures of the two intermediates and the final product of the Grubbs catalysis reaction are shown in the attached image, with emphasis on the stereochemistry of the two intermediates and the end product.

Intermediates are those species which are formed during the process of any chemical reaction which in turn finally converts into products.

Stereochemistry is a discipline of chemistry that studies the three-dimensional structure of molecules and how it influences their physical and chemical properties.

According to the question it is discussing about the Grubbs catalysis reaction which is a transition metal carbene series complex in which mixture of two optical active compounds are obtained which are the intermediates which finally gives product after reduction.

Hence the required structures are shown in the attached image.

To know more about stereochemistry, visit the below link:

https://brainly.com/question/12973261

#SPJ4

Answer:

the N at the top is north bottom is south w on your left is west and e of your right is east

Answer:

The Lewis structure indicates that each Cl atom has three pairs of electrons that are not used in bonding (called lone pairs) and one shared pair of electrons (written between the atoms). A dash (or line) is sometimes used to indicate a shared pair of electrons: A single shared pair of electrons is called a single bond.

Explanation:

Answer:

C. Nylon

Explanation:

Nylon is a synthetic fiber, strong, elastic, and holds excellent abrasion resistance. Therefore it is used for making parachutes and ropes for rock climbing.

Answer:

Nylon

Explanation:

Mass is the weight of the compound or the molecule in a sample that is given in grams. The mass of sucrose in the sample is 171 gms.

The mass of the compound is the product of the molar mass of the compound and the number of moles of the compound in a sample.

Given,

The molar mass (m.w.t) of sucrose = 342.3 g/mol

Number of moles (n) of sucrose = 0.500 moles

The mass of sucrose is calculated as:

[tex]\begin{aligned} \rm mass &= \rm molar\; mass \times moles \\\\&= 342.3 \times 0.500\\\\&= 171.15 \;\rm gm\end{aligned}[/tex]

Therefore. the mass of sucrose in the sample is option A. 171 gms.

Learn more about mass here:

https://brainly.com/question/4058235

At an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L

Avogadro's law states that equal volumes of different gases contain an equal number of molecules provided temperature and pressure remains in the same conditions. It is expressed;

V₁/n₁ = V₂/n₂

Given the data in the question;

To determine the new volume, we substitute our given values into the expression above.

V₁/n₁ = V₂/n₂

V₁n₂ = V₂n₁

V₂ = V₁n₂/n₁

[tex]V_2 = \frac{5.00L * 1.80mol}{0.965mol}\\\\V_2 = \frac{5.00L * 1.80}{0.965}\\\\V_2 = \frac{9L}{0.965} \\\\V_2 = 9.22L[/tex]

Therefore, at an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L

Learn more about Avogadro's law: https://brainly.com/question/3491421

Explanation:

When a carboxylic acid is treated with an alcohol and an acid catalyst, an ester is formed (along with water). This reaction is called the Fischer esterification.

The reaction between alcohols and carboxylic acids is called Fischer esterification.

Fischer Esterification is an organic reaction that produces an ester by converting carboxylic acids in the presence of excess alcohol and a strong acid catalyst.

This ester is created in the presence of water.

Thus, the reaction between alcohols and carboxylic acids is called Fischer esterification.

Learn more about Fischer esterification

https://brainly.com/question/20534038

#SPJ4

Iodine and quaternary ammonium are chemical sanitizers approved for operations.

These are chemicals which help to remove pathogens from the surface of materials.

Iodine and quaternary ammonium are able to do that in a safe manner. This is therefore the reason why both of them were approved as sanitizers and chosen as the most appropriate options.

Read more about Sanitizers here https://brainly.com/question/4713569

Answer:

shows how anything like each thing is composed of for instance see how water is made of: hydrogen and oxygen which makes it a compound

The elements are the basic things by which everything in the world is build up. Different elements combine to form compounds. There are various kinds of inorganic and organic compounds around us that create the matter.

Elements are the basic things of any substance in the world. There are 118 known elements which can be found in the modern periodic table. These elements include metals, gases, and semi metals.

Atoms of same elements forms molecules. Atoms of different elements combines to form the compounds. There are various types of compounds such as ionic compounds, covalent compounds, coordination complex etc.

Water is a compound formed from the elements hydrogen and oxygen. The table salt we use every day is a compound, sodium chloride. Similarly we can find there are many compounds that we use everyday are creating the matter in the world.

Find more on elements:

https://brainly.com/question/13025901

#SPJ3

Answer:

According to the kinetic theory of gases, in an ideal gas between two successive collisions, a gas molecule travels in a straight line.

According to the kinetic theory of gases, an ideal gas molecule move in a straight line between two successive collisions.

The kinetic theory of gases says that the gas is many large numbers of subatomic particles, which randomly motion always.

They move on a straight plane and only change their path when they collide with other molecules or the container's walls.

Thus, according to the kinetic theory of gases, an ideal gas molecule move in a straight line between two successive collisions.

Learn more about the kinetic theory of the gases

https://brainly.com/question/15064212

#SPJ4

Answer:

3,550,000

Explanation:

3 significant figures is a number which has 3 figures

and zeros ( zero is not a figure )

Answer:

3550,000

Explanation:

Rounding rule:

If > 5 enter one

If < 5 rounding

Note:

< = less than

> = greater than.

Solve:

Base on the given:

it < 5 rounding

Thus,

3545,530 ≈ 3550,000

~Lenvy~

The element which is likely to have a high thermal conductivity among given options is sodium.

Thermal conductivity of any substance is define as the capability of the substance to carry heat or transfer of heat.

As we know that metals are the good conductors of heat and non-metals are bad conductors, so we exclude carbon, antimony and chlorine atom from this group as they are non-metals. And sodium atom has the thermal capability.

Hence option (4) is correct.

To know more about thermal conductivity, visit the below link:
https://brainly.com/question/11213835

Answer: Option (4) is correct

Explanation:

The next stage of exploration should be gathering information about the planetary system.

Once we confirm other planetary systems, the next stage of exploration should be the use of instruments that helps us to collect information about that planetary objects so we can conclude that the next stage of exploration should be gathering information about the planetary system.

Learn more about exploration here: https://brainly.com/question/13335713

Answer:

45830.4 moles

Explanation:

Ideal gas law is the hypothetical equation in which the pressure, volume, and temperature of the gas are directly related. It can be denoted as:

PV = nRT

The ideal gas law is:

PV = nRT

where,

P = Pressure

V = Volume

R = Gas constant

T =Temperature

n = moles

Given:

Moles in container = 1.95

Temperture = 294.85 K

Pressure = 3.75 atm

Volume =?

Substituting the values:

V = nRT/P

V = 1.95 × 0.082 × 294 / 3.75

Volume = 12.5 L

Now, the condition when changed, such that temperature is 301.25 K, pressure is 0.998 atm, and Volume is 12.5 L, then moles will be equal to:

PV/RT = n

0.998 × 12.5 / 0.082 × 301.25 = n

n = 45830.4 moles

Therefore, 0.521 moles is still present in the container.

To know more about ideal gas law, refer to the following link:

brainly.com/question/12124605

The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s )

To determine the atom we will have to determine the molar mass of the atom

Applying De Broglie equation

λ = h / mv

Vrms = [tex]\sqrt{\frac{3RT}{M} }[/tex]  ---- ( 1 )

Where : λ  = 2.31 * 10⁻¹¹,  R = 8.314 J / k.mol,  T = 373 K, h = 6.626 * 10⁻³⁴ J.s

From equation ( 1 )

M = ( h² Ua ) / 3RT*λ² --- ( 2 )

where : Ua ( mass of an atom ) = 6.022 * 10²³,  h = 6.626 * 10⁻³⁴,  R = 8.314 J / k.mol, λ  = 2.31 * 10⁻¹¹,    T = 373 K

Insert values into equation ( 2 )

M ( molar mass ) = 32 g/mol

Sulphur has a molar mass of 32 g/mol therefore the atom is sulphur.

Hence we can conclude that The atom that moves at its rms velocity at 100°C with a wavelength of 2.31 * 10 m is : SULPHUR ( s ).

Learn more about sulphur : https://brainly.com/question/26328290

Answer:

two electrons

Explanation:

Calcium atoms will lose two electrons in order to achieve the noble gas configuration of argon.

Answer:

The key difference between dissociation and solvation is that dissociation is the breakdown of a substance into the atoms or ions from which the substance is made of whereas solvation is the dissolution of a substance in a solvent due to the attraction forces between solvent molecules and the components.

Explanation:

Solvation refers to the process of surrounding solute particles with solvent molecules, leading to the formation of a solution. Dissociation specifically refers to the breaking apart of ionic compounds or molecules into their constituent ions when dissolved in a solvent.

Solvation occurs due to the attractive forces between the solute and solvent molecules, such as dipole-dipole interactions or hydrogen bonding. The result of solvation is the formation of a homogeneous solution where the solute particles are evenly distributed at the molecular level within the solvent.

Ionic compounds are composed of positively charged cations and negatively charged anions held together by electrostatic forces. When an ionic compound is dissolved in a solvent, such as water, the solvent molecules interact with the compound's ions, pulling them apart and surrounding them.

To learn more about the solvation, follow the link:

https://brainly.com/question/1118783

#SPJ6

Answer:

ΔS=2.303 n Rlog(

V

1

​

V

2

​

​

)

=2.303×10×8.314log(

10

100

​

)=191.47 JK

−1

Thus ΔS=191.47JK

−1

Explanation:

Answer:

( c ) sunlight.

Explanation:

the leaves are closer to the sunlight they require.

Answer:

0.2 moles

Explanation:

The equation is given by;

2HCl => H² + Cl²

According to stoichiometry;

[tex] \frac{n \: hcl}{2} = \frac{n \: h {}^{2} }{1} [/tex]

[tex]nhcl = 2 \times nh {}^{2} [/tex]

To produce 0.62 moles of H² gas we need,

nHCL=2×0.62=1.24 moles

Using the relation;

number of moles:Number of atoms/Avogadro's constant

We can then say;

N(numb. of atoms)=n×Na

Number of atoms=1.24×6.02×10²³

Number of atoms=7.5852×10²³ atoms

Answer:

FLUORINE

Explanation:

It has 5 electrons In Its 2P shell!

Answer:

Fluorine

Explanation:

because it has a score of 4.0 which is the highest possible

The world is divided into large areas based on their average temperatures and precipitation is called climate zones.

The principal zones that are demarcated by lines of latitude due to which the earth can be divided on the basis of climate. Tropical zone, Subtropics zone, Temperate zone and Cold zone are the four types of climatic zones.

So we can conclude that large areas based on their average temperatures and precipitation is called climate zones.

Learn more about climate here: https://brainly.com/question/17922964

The world is divided into large areas called climate zones based on their average temperatures and precipitation.

Climate zones are areas of the Earth that results from differences in climate such as temperature, humidity, amount of precipitation etc.

Climate zones of the globe are as follows:

Therefore, it can be said that the world is divided into large areas called climate zones based on their average temperatures and precipitation.

Learn more about climate zones at: https://brainly.com/question/1080277

Answer:

Electronic configuration of nitrogen: K=2 L=5

Electronic configuration of phosphorus : K = 2 L = 8 M = 5

The element nitrogen will be more electronegative because of the smaller size of its atom. nitrogen accepts electrons more easily.

Explanation:

Explanation:

Nitrogen is more electronegative than phosphorus.

Reason :-

From top to bottom down a group, electronegativity decreases.

Explanation :-

Number of shell increases down a group, so there is an increased distance b/w the valence electrons and nucleus, or a greater atomic radius.‎ ‎

       Since nitrogen has a smaller atomic radius than phosphorus, the attraction of its nucleus towards the incoming electron is more than phosphorus. So , because of smaller atomic size nitrogen accepts electrons more easily.

The formation of a primary alcohol from a ketone involves the use of a ketone and NaBH4 followed by an acid workup.

The question is unclear but clearly relates to the formation of a primary alcohol. The first step in this reaction is the attack of the NaBH4 on the carbonyl carbon of butanone.

The reaction sequence is completed by an acid work up in which an acidic hydrogen is abstracted by the nucleophile to yield a primary alcohol.

Learn more about primary alcohol:https://brainly.com/question/7207863

The limiting reactant for the combustion reaction for acetylene is oxygen.

Limiting reagents are those reagent which is present in less quantity as compared to the other reagent present for the formation of product.

Given chemical reaction is:

2C₂H₂(l) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)

From the stoichiometry of the reaction, it is clear that:

2 moles of C₂H₂ = react with 5 moles of O₂

37 moles of C₂H₂ = react with 5/2×37=92.5 moles of O₂

And given moles of oxygen is 81 moles.

81 moles of O₂ = reacts with 2/5×81=32.4 moles of C₂H₂

And given moles of C₂H₂ = 81 moles.

Hence, O₂ is the limiting reagent.

To know more about limiting reagent, visit the below link:

https://brainly.com/question/14222359

Answer:

O2 is the limiting reactant.

Answer:

Chlorine

Explanation:

Answer: By reacting with the hydrogen ions.

Explanation:

The single most important factor influencing potassium ion secretion is its concentration in blood plasma.

This is the liquid portion of the blood and serves as the transport medium for nutrients in the body.

When there is a high concentration in the plasma, it maximizes the concentration gradient which favors its secretion into the urinary fluid.

Read more about Plasma here https://brainly.com/question/2901507

The single most important factor influencing potassium ion secretion is concentration.

This is the liquid part of the blood present in the body and it transports nutrients throughout the body.

Whenever in the body there is high concentration of potassium ion as a result of which concentration gradient increases which in turn favors the secretion of potassium ion into the urinary fluid.

Hence concentration is the important factor.

To know more about concentration gradient, visit the below link:

https://brainly.com/question/19191811

#SPJ4