A 100. 0 mL sample of natural water was titrated with NaOH. The titration required 13. 57 mL of 0. 1123 M NaOH solution to reach a light pink phenolphthalein end point. Calculate the number of millimoles of NaOH required for the titration

Answer:

Explanation:

Answer:

It's basically an active site of an enzyme precisely fits a specific substrate. It reduces the energy that is well needed for reactants that come together.

Glucose is the simplest sugar and carbohydrate that provides energy. The simplified model of glucose (C₆H₁₂O₆) shows carbon, hydrogen, and oxygen atoms linked together.

Glucose is an example of a carbohydrate macromolecule that is further classified as a monosaccharide. They are crystalline and fundamental units of carbohydrates.

The molecular formula of glucose is C₆H₁₂O₆ and the mass is 180.156 g/mol. It is an aldohexose that contains an aldehydic functional group. In its structure, there are six oxygen atoms, six carbon atoms, and twelve hydrogen atoms.

Therefore, the glucose molecule is composed of C, H, and O.

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The transformation efficiency of E. coli HB101 using calcium chloride can vary depending on the experimental conditions and the protocol used.

However, transformation efficiency is a measure of how many bacterial cells take up the foreign DNA and become genetically transformed, usually reported as the number of transformants per microgram of DNA. To calculate the transformation efficiency of E. coli HB101 using calcium chloride, follow the 5 steps:

1. Perform a transformation experiment using E. coli HB101 and calcium chloride. This usually involves treating the bacterial cells with calcium chloride to make them more permeable to foreign DNA, then exposing them to the DNA of interest.

2. Plate the transformed cells on selective agar plates that will allow only the transformed cells to grow.

3. Count the number of transformant colonies that appear on the selective agar plates after a suitable incubation period.

4. Determine the amount of DNA (in micrograms) used in the transformation experiment.

5. Calculate the transformation efficiency by dividing the number of transformant colonies by the amount of DNA used.

The result will be in the unit of transformants per microgram of DNA. Keep in mind that the transformation efficiency can be influenced by factors such as the quality and concentration of the DNA, the bacterial strain, and the specific experimental conditions. Therefore, the transformation efficiency for E. coli HB101 using calcium chloride may differ between experiments and laboratories.

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Explanation:

There are certain metals that are less reactive compared to standard hydrogen electrode.

So, such metals do not release hydrogen gas in a reaction with dilute acids.

Examples of such metals are:

copper,silver,gold,platinum,mercury.

Answer:

A burning match stick is brought

near the mouth of the test tube, but no sound is

heard. That means hydrogen gas is not released in this reaction and the metal may be a less reactive metal and it is one among the above list of metals.

Answer:

i think it's a sedimentary rock...

reason:- these are the only rocks containing fossils

Explanation:

brainliest plz

It is true that water has a higher latent heat of vaporization than most other common liquids.

Latent heat of vaporisation is the amount of energy that is required to transform one gram of liquid water into water vapor.

Water has a very high heat of vaporisation because of the network of hydrogen bonding present between water molecules. Water's heat of vaporization is around 540 cal/g at 100 °C.

Compared to other liquid molecules, water has a higher heat of vaporisation.

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Answer:

8 bond

Explanation:

The Dichlorine heptoxide molecule contains a total of 8 bond(s) There are 8 non-H bond(s), 6 multiple bond(s) and 6 double bond(s).

In the solution water is solute and ethanol is solvent.

Binary solution

A mixture of two liquids that are completely miscible one with another is known as a Binary solution. The boiling point of binary solution depends upon the composition of the solution.

A binary solution consists of a solute and a solvent.

The solute is usually present in smaller quantity and solvent is in larger quantity.

If a solution has 70 ml ( larger quantity ) of ethanol , it means ethanol is the solvent .

water with 30 ml of quantity ( smaller quantity ) will be the solute.

So , in the mixture, water is the solute.

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Answer:

\({ \tt{c). \: replacement}}\)

C) replacement

Iron(III) oxide (Fe2O3) reacts with aluminium(Al) to form aluminium oxide(Al2O3) and molten iron(Fe). This is a replacement reaction

Answer: The light bends closer towards the normal and is refracted.

Explanation:  The light is passing through something less dense (air) to more dense (water), it's going to bend the light more towards the normal and will refract the light making it look bent at the surface of the water.

Answer:

Sure because of the gravity of the earth

Answer:

c

Explanation:

Answer:

The answer is

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question

mass of mineral = 14.7 g

volume = 2.2 cm³

It's density is

\(density = \frac{14.7}{2.2} \\ = 6.681818181...\)

We have the final answer as

Hope this helps you

Answer:

6.68g/cm³

Explanation:

The formula is [ d = m/v ] where m = mass and v = volume.

We are given both "m" and "v" so we can solve using those variables.

d = 14.7/2.2

d ≈ 6.68

Best of Luck!

IUPAC is the nomenclature approach used for naming compounds. The compounds are ethane, butane, and butene.

IUPAC is the nomenclature method of the organic compounds that are universal and is recommended by the International union so that the names of the same chemical species are constant and ubiquitous all over.

The first compound has a single bond and two carbons hence ethane, the second compound has a single bond and four carbons and hence butane, and the third compound has one double bond and four carbon atoms and hence butene.

Therefore, the compounds are ethane, butane, and butene.

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Answer:

Energy transfer between the particles in solids, liquids, and gases can explain how warm matter outside a cup can cause a cold liquid inside the cup to warm up.

Explanation:

Answer:

The drink in the regular cup warms up.

Explanation:

The reason why it warms up is because the cup is colder than room temperature and melts another reason why the drink in the regular cup warms up is because when we breathe out hot air is coming out soo that also makes the drink warmer.

When adding ice to a hot soup, it is generally recommended to use ice made from potable or drinkable water.

The water used to make the ice should be clean and free from any contaminants that could affect the taste or safety of the soup.

It is advisable to use filtered or purify water to make the ice to ensure that it is of good quality. This helps prevent any unwanted flavors or impurities from transferring to the soup.

Using tap water can also be acceptable if it meets the drinking water standards in your area and is considered safe for consumption. However, if you have concerns about the quality of your tap water, using filtered water is a safer option.

Ultimately, the goal is to add ice made from water that is safe and of good quality to avoid any negative impact on the taste or safety of the soup.

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Explanation:

High emission of CO2 which is bad and the wild animals which live in that spot will flee, thus that place will eventually lose much more ecological diversity.

E of C13−BE of C12=7.5×13−7.68×12=97.5−92.16=5.34 MeV.

Given that it serves as the reference point for calculating the atomic masses of all other nuclides, carbon-12 is particularly significant:by definition, it has an atomic mass of 12.

Numerous naturally occurring substances, including rocks like limestone, coral, as well as the shells or animals like clams, contain carbon-12.Coal and petroleum, two significant fuels, both contain carbon.

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it is chemical change because chemical change occur when bonds are broken or formed between molecules or atoms.

Explanation:

Difference between 63 and 65 = 2.

(63.55 - 63) / 2 * 100% = 27.5%.

(65 - 63.55) / 2 * 100% = 72.5%.

Hence there is 72.5% of the isotope with atomic mass 63 and 27.5% of the isotope with atomic mass 65 in copper.

Answer:

Known as Table salt

Answer:

52 mL of H₂O.

Explanation:

The balanced equation for the reaction is given below:

2H₂ + O₂ —> 2H₂O

From the balanced equation above,

2 mL of H₂ reacted with 1 mL of O₂ to produce 2 mL of H₂O.

Finally, we shall determine the volume of H₂O that will be produced by the reaction of 52 mL of H₂ at the same temperature and pressure.

This can be obtained as follow:

From the balanced equation above,

2 mL of H₂ reacted to produce 2 mL of H₂O.

Therefore, 52 mL of H₂ will also react to produce 52 mL of H₂O.

Thus, 52 mL of H₂O were obtained from the reaction.

The mass of the iron (Fe) sample that contains the same number of moles as a 14.0 g sample of Ar is 55.8 g.

To solve this problem, we must first determine the number of moles of Ar in the given 14.0 g sample. Ar's molar mass is 39.95 g/mol, according to the periodic table. Therefore, 14.0 g of Ar (1 mol Ar/39.95 g) = 0.350 mol Ar.

So the sample's Fe mass, which contains the same number of moles, is determined using the molar mass of iron (Fe) from the periodic table. Iron's molar mass is 55.8 g/mol. Therefore, the mass of the Fe sample is as follows:0.350 mol Fe x 55.8 g/mol = 19.53 g Fe. So, there are 19.53 grams of Fe in a sample of Fe that contains the same number of moles as a 14.0 g sample of Ar.

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The names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)

From the question,

We are to determine the how the name of CaS differ from the name of CdS

First, we will determine the identities of the elements in the given compounds

Ca represents calcium

and

S represents sulfur

∴ The compound is named Calcium sulfide

Cd represents the element Cadmium

and

S represent the element Sulfur

∴ The compound is named Cadmium sulfide

Hence, the names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)

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Answer:

the answer is d that is 6×2/3

Answer:

The question did not contain any listed options. However, starch is a common white powder that will give a color change on reacting with iodine molecules

Explanation:

Iodine is a common indicator used in the lab to detect the presence of starch or starchy substances.

Iodine molecules react with amylose in starch to form a complex with a deep blue-black coloration.

Hence, a common white powder which reacts with iodine molecules to give a blue-black color must be a substance that contains starch.

The answer is:

d) cornstarch