Which group is known as the halogens?
A.01
B.2
C.17
D. 18

Answer:

a

Explanation:

neutalize acidity level

Answer:

Solvent = Water

Solute = Salt

Answer:

Magnesium in tube 3 and copper in tube 5 became compounds

If each of the test tubes contained a less reactive compound and a more reactive element or less reactive element and more reactive compound , in first case chemical change of displacement reaction will occur while in second case no reaction will occur as zinc exists as an element.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

5.11 %

Explanation:

Step 1: Convert the volume of water to millimeters

We will use the relationship 1 L = 1,000 mL.

\(4.52 L \times \frac{1,000mL}{1L} = 4.52 \times 10^{3} mL\)

Step 2: Calculate the mass corresponding to 4.52 × 10³ mL of water

The density of water is 1.00 g/mL.

\(4.52 \times 10^{3} mL \times \frac{1.00g}{mL} = 4.52 \times 10^{3} g\)

Step 3: Calculate the mass of the solution

The mass of the solute (glucose) is 243 g and the mass of the solvent (water) is 4.52 × 10³ g. The mass of the solution is:

m(solution) = m(solute) + m(solvent)

m(solution) = 243 g + 4.52 × 10³ g

m(solution) = 4.76 × 10³ g

Step 4: Calculate the mass percent of glucose in the solution

\(\% Glucose = \frac{mass\ of\ solute}{mass\ of\ solution} \times 100 \% = \frac{243g}{4.76 \times 10^{3}g} \times 100 \% = 5.11 \%\)

As per the given balanced reaction, 2 moles of silver gives 1 mole of the product silver sulfide. Hence, 0.04 moles will given 0.02 moles of silver sulfide.

The theoretical yield of a reaction is the amount of product obtained based on the balanced chemical equation of the reaction. However, the actual yield might vary from the the theoretical value.

The given reaction of Ag and H₂S shows that, two  moles of Ag produce one mole of the product silver sulfide.

Number of moles of silver sulfide produce by 0.04 moles of Ag is  then half of this number that is 0.02 moles of Ag₂S.

Therefore, 0.0 moles of Ag will give 0.02 moles of silver sulfide.  Using the same way, we can determine the yield of products in any reaction.

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This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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To find the density of the unknown piece of metal, we can use the formula:

Density = mass / volume.

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Answer:

Option A. ZnCl₂ (aq) + H₂ (g)

Explanation:

In a chemical equation, reactants are located on the left hand side (L. H. S) while the products are located on the right hand side (R. H. S) i.e

Reactants —> Products

From the question given above, we obtained the following equation:

Zn (s) + 2HCl (aq) —> ZnCl₂ (aq) + H₂ (g)

The products of the above equation is:

ZnCl₂ (aq) + H₂ (g)

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

From the question

mass = 50 kg

acceleration = 0.8 m/s²

We have

Force = 50 × 0.8

We have the final answer as

Hope this helps you

When using the separatory funnel for the extracting an aqueous solution of benzoic acid. The organic solvents is most likely not going to be the top most layer of the extraction is the correct option is dichloromethane.

The density of the water is 1 g/cm³

The Hexane has a density of 0.655 g/cm³

The Diethyl ether has a density of 0.713 g/cm³

The ethyl alcohol density is of 0.78 g/cm³

The dichloromethane density is of 1.33 g/cm³

The dichloromethane is denser than the water so it  will most likely not going to be the top layer of the extraction.

Thus, the correct option among the organic solvent is the dichloromethane.

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The partial pressure of \(N_2\)is 165.6 kPa and the partial pressure of \(H_2\)is 434.4 kPa.

To calculate the partial pressures of \(H_2\)and \(N_2\)in the 10dmcube container, we need to use the ideal gas law equation, which states that the pressure of a gas is directly proportional to its number of moles and temperature, and inversely proportional to its volume.

First, we need to calculate the number of moles for each gas. Since we are given the volume of each gas and the volume of the container, we can use the formula:

Number of moles = Volume / Molar volume

The molar volume is the volume occupied by one mole of a gas at a given temperature and pressure. At standard temperature and pressure (STP), the molar volume is 22.4 L/mol.

For \(N_2\), the number of moles is 2 dmcube / 22.4 L/mol = 0.089 mol
For \(H_2\), the number of moles is 5 dmcube / 22.4 L/mol = 0.223 mol

Next, we can calculate the partial pressures of each gas using the formula:

Partial pressure = (Number of moles / Total number of moles) * Total pressure

The total pressure is the sum of the pressures of each gas:

Total pressure = Pressure of N2 + Pressure of \(H_2\)

Given that the pressure of N2 is 100 kPa and the pressure of \(H_2\)is 500 kPa, we have:

Total pressure = 100 kPa + 500 kPa = 600 kPa

Now we can calculate the partial pressure of \(N_2\):

Partial pressure of \(N_2\)= (0.089 mol / (0.089 mol + 0.223 mol)) * 600 kPa = 165.6 kPa

Similarly, we can calculate the partial pressure of \(H_2\):

Partial pressure of H2 = (0.223 mol / (0.089 mol + 0.223 mol)) * 600 kPa = 434.4 kPa

Therefore, the partial pressure of \(N_2\)is 165.6 kPa and the partial pressure of \(H_2\)is 434.4 kPa.

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The best diagram to represent N2O is the second diagram.

The Lewis diagram is used to represent the way two or more atoms bond. This is possible by using lines to represent bonds and dots to represent electrons.

In the case of the molecule N2O bonding occurs in the following way:

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0.342 x \(10^(^1^6^)\))  photons are required to emit 1 joule of energy.

A photon is a particle of light defined as a discrete bundle (or quantum) of electromagnetic (or light) energy.

We need to find the number of photons emitted per second.

So we have E = hc ÷ λ

= (6.6 x \(10^-(^3^4^)\)x 3 x \(10^8\) m/s) ÷ 6.78 x \(10^(^-^7^)\)nm

= 2.92 x \(10^(^-^1^9^)\)Joules

Now number of photons per second = I / E (I = intensity)

= 1 x \(10^(^-^3^)\) joule / sec ÷ 2.92 x \(10^(^-^1^9^)\)joule

= 0.342 x\(10^(^1^6^)\)

Hence, 0.342 x \(10^(^1^6^)\))  photons are required to emit 1 joule of energy.

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Answer:

\(\boxed {\boxed {\sf 2.7 \ g/mL}}\)

Explanation:

Density is the mass per unit volume of a substance. It is calculated by dividing the mass by the volume.

\(\rho = \frac{m}{v}\)

The mass of the mineral is 48.6 grams. The volume is 18 milliliters.

Substitute the values into the formula.

\(\rho= \frac{ 48.6 \ g}{18 \ mL}\)

Divide.

\(\rho = 2.7 \ g/ mL\)

The density of the mineral sample is 2.7 grams per milliliter.

Answer:

Ionic bond

Explanation:

An ionic bond holds positive and negative ions together.

A full response is that the molecule with 32.1 g of S and 32 g of O has the empirical formula SO2.

Every compound's empirical formula is the simplest whole-number ratio of all of its atom types. It could occasionally be the same as the compound's molecular formula.

By first calculating the masses of each element contained in a compound, it is possible to experimentally ascertain the complex's empirical formula. Afterward, turning each element's mass into a corresponding mole.

To determine the empirical formula of the compound, we need to find the simplest whole-number ratio of the elements in the compound.

Moles of S = mass of S / molar mass of S

Moles of S = 32.1 g / 32.06 g/mol (molar mass of S)

Moles of S = 1.001 mol

Moles of O = mass of O / molar mass of O

Moles of O = 32 g / 15.99 g/mol (molar mass of O)

Moles of O = 2.001 mol

Moles of S in simplest ratio = 1.001 mol / 1.001 mol = 1

Moles of O in simplest ratio = 2.001 mol / 1.001 mol = 2

The empirical formula of the compound is SO2.

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Ionization potential and ionization energy are two terms used to describe the same thing.

The ionization potential of hydrogen atom is 13.6 eV

The ionization potential is the energy that is required to remove an electron from the neutral atom. It is the same as the ionization energy.

From the question, we can see that the ionization energy of the hydrogen atom is 13.6 eV, it also means that the ionization potential of the hydrogen atom is also 13.6 eV.

Therefore, If ionization energy of hydrogen atom is 13.6 eV then its ionization potential will be 13.6 eV

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The number of moles of Cl₂ gas is equal to 1.83 mol in 130 g of chlorine gas.

A mole can be used to describe a standard unit that is utilized to determine a given count of particles. The particles that can be counted are chemically identical chemical entities, individually distinct.

A mole can be used to calculate quantities such as atoms, molecules, ions, or other particular particles.

Given, the mass of the chlorine gas = 130 g

The mass of one mole of chlorine gas = 71 g/mol

The number of moles of Cl₂ gas = Mass/ molar mass = 130/71 = 1.83 mol

Therefore, the number of moles of chlorine gas is 1.83 mol.

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We have to do a dimensional analysis. We have to convert from 25.9 grams of Cr2O3 to moles using the molar mass of Cr2O3 which is 152 g/mol (You can find the molar mass using the periodic table). Then, we have that in 1 mol of Cr2O3, there are 2 moles of chromium (Cr) and finally, the value that we obtain is converted to grams of Cr using the molar mass of Cr which is 52 g/mol.

This dimensional analysis would look like this:

The answer is that the mass of chromium is 17.7 grams.

Answer:

k20

Explanation:

potassium oxide

hope this helped

Answer:

a. The Zn and HCl both retained their identity.

%Chlorine= Mass of organic compound

Mass of chlorine × 100 Chloral ( CCl 3CHO ) = 147.5106.5×100=72.20% Pyrene( CCl 4 )= 154142×100=92.20% Highest

Explanation:

Answer: Chloroform (CHCL3) has a lower percentage of Chlorine than CCL4 as:

Explanation:
Percentage of Chlorine in CCL4 is 93% whereas percentage of Chlorine in CHCL3 is 35%

Hope this helps.

Answer:

El termómetro expuesto directamente al sol medirá la temperatura del aire circundante y la radiación solar, pero no la temperatura del sol en sí.

There are two main types of autotrophic bacteria: photoautotrophs utilize light as an energy source, whereas chemoautotrophs derive energy by oxidizing inorganic compounds.

Photoautotrophs use pigments such as chlorophyll or bacteriochlorophyll to capture light energy, which is then used in the process of photosynthesis to produce organic compounds from carbon dioxide. Chemoautotrophs, on the other hand, do not require light as an energy source and instead use energy from the oxidation of inorganic compounds such as ammonia, hydrogen sulfide, or ferrous iron to drive the synthesis of organic compounds.

Chemoautotrophic bacteria are often found in extreme environments such as deep-sea hydrothermal vents, where they are able to derive energy from the chemical reactions occurring in the surrounding environment.

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Answer:

About 170-180 grams of potassium nitrate are completely dissolved in 100 g.

Explanation:

Hello!

In this case, according to the reported solubility data for potassium nitrate at different temperatures on the attached picture, it is possible to bear out that about 170-180 grams of potassium nitrate are completely dissolved in 100 g; considering that the solubility is the maximum amount of a solute that can be dissolved in a solvent, in this case water.

Best regards!

Answer:

pH ≈ 4.92

Explanation:

pH = -log(0.000012)

pH ≈ 4.92