Water exhibits hydrogen bonding. Which option describes what this indicates about water?Water will generally require less energy for a phase change compared to a similar substance without hydrogen bonds.Water will generally have a lower melting point compared to a similar substance without hydrogen bonds.Water will generally require more energy for a phase change compared to a similar substance without hydrogen bonds.Water will generally have a lower boiling point compared to a similar substance without hydrogen bonds.

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The mass of calcium chloride and water used to form a 28.0% calcium chloride solution with a total mass of 663.2 g are 189.54 g and 473.66 g, respectively.

Then find the masses of calcium chloride and water used to form the solution, we first need to determine the mass of calcium chloride in the solution. Since the solution is 28.0% calcium chloride by mass, we can calculate the mass of calcium chloride as follows:

Mass of calcium chloride = 0.28 x 663.2 g = 185.62 g

Next, we can use the mass of calcium chloride to calculate the mass of water in the solution:

Mass of water = Total mass - Mass of calcium chloride

Mass of water = 663.2 g - 185.62 g

Mass of water = 477.58 g

Therefore, the mass of calcium chloride and water used to form the solution are 189.54 g and 473.66 g, respectively.

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Answer:

In a survey of a group of people, it was found that 60 0f them have

business, 45 have government jobs, 125 have farming, 27 have business

only, 15 have government job only, 10 have business and government

job only, 5 have government job and farming only.

i) How many people have all the profession?

ii) How many people were there in a survey?

Answer:

salty foods

Explanation:

Salty foods like chips, frozen dinners, and fast food may impair your body's immune response, as high salt diets may trigger tissue inflammation and increase the risk of autoimmune diseases.

Answer:

1. Convert the mass of A to moles dividing in molar mass

2. Convert the moles of A to moles of D (2mol A = 3mol D)

3. Convert the moles of D to mass multiplying by its molar mass

Explanation:

As you can see in the equation, 2moles of A produce 3 moles of D, the equation is:

2mol A = 3mol D

But in the problem you are having the mass of A and you need the mass of D. That means you require to convert the mass of A to moles. With the moles of A you can find the moles of D and, as last, you need to convert the moles of A to mass.

To convert mass to moles or vice versa you must use Molar Mass. That means, the answer is:

Answer:

a. The limiting reagent is NO2.

b. 126g of nitric acid can be produced.

Explanation:

1st) It is necessary to write the balanced equation:

From the balanced equation we know that 3 moles of NO2 (3x46g= 138g) react with 1 mol of water (18g/mol) to produce 2 moles of nitric acid (2x63g= 126g) and 1 mol of NO (30g/mol).

2nd) To calculate the limiting reagent it is necessary to use the given values and the stoichiometry of the balanced equation:

The 10.0g of NO2 will need 1.30g of H2O to react.

The 30.0g of H2O will need 230g of NO2 to react.

So, as we only have 10.0g of NO2 and 30.0g of H2O, the limiting reagent will be NO2.

3rd) Now, to calculate the theorical yield, we need to use the stoichiometry of the balanced equation using the limiting reagent:

1 mol of H2O produces 2 moles of nitric acid. With the molar mass of nitric acid (63g/mol), we can calculate the grams.

Finally, 126g of nitric acid will be produced if the reaction is 100% efficient (theoretical yield).

There are 0.50 moles in 1. 2.00 moles of ammonia (nh3).

1. 2.00 moles of ammonia (NH3) contains 6.022 x 1023 molecules of ammonia.

2. 0.50 moles of chlorine contain 3.02 x 1023 molecules of chlorine.

3. 0.250 moles oxygen contains 1.50 x 1023 molecules of oxygen.

4. 4.00 moles of sulfur dioxide contain 2.41 x 1024 molecules of sulfur dioxide.

5. 2.50 moles of methane contain 1.51 x 1024 molecules of methane.

6. 3.612 x 1024 molecules of phosgene (COCL2)

7. 3.01 x 1023 molecules of freon (CHCLF2)

8. 1.505 x 1024 molecules of sucrose (C12H22O11)

9. 1.806 x 1024 molecules of bromine

10. 3.01 x 1024 atoms of argon

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The given chemical equation can be balanced as: CH4 + 2O2 → CO2 + 2H2OTherefore, the balanced chemical equation for the reaction between 46 g of CH4 and 32 g of O2 is:CH4 + 2O2 → CO2 + 2H2OMoles of CH4 = (46 g)/(16.04 g/mol) = 2.87 molMoles of O2 = (32 g)/(32 g/mol) = 1 mol.

Moles of CH4 = (46 g)/(16.04 g/mol) = 2.87 molMoles of O2 = (32 g)/(32 g/mol) = 1 molFor the given reaction, one mole of CH4 reacts with 2 moles of O2. Therefore, 2.87 moles of CH4 would react with 2 × 2.87 = 5.74 moles of O2. As we can see from the given values, only 1 mole of O2 is present. Hence, O2 is the limiting reactant.The balanced chemical equation for the reaction between 46 g of CH4 and 32 g of O2 is:CH4 + 2O2 → CO2 + 2H2OOn

The basis of the balanced chemical equation, 2 moles of O2 is required for one mole of CH4. Here, the moles of O2 is lesser than 2 times the moles of CH4, which means O2 is the limiting reactant and CH4 is the excess reactant. Hence, 32 g of O2 will react completely with 1 mole of CH4, and 14.14 g of CO2 and 4 g of H2O will be produced as per the stoichiometry.

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Answer:

This question is incomplete

Explanation:

This question is incomplete because of the absence of options. However, when a solid substance is subjected to heat, it's particles will have an increase in kinetic energy which causes the solid to fluidize as it changes state to liquid (or fluid). The same thing can be said about the heating of a silver strip, the silver particles will have an increase in kinetic energy.

It should be noted that the particles of a solid substance generally have very little or no kinetic energy, thus the reason for the compact shape of a solid.

Oxygen is the oxidizing agent in a corrosion reaction.

Corrosion is an example of a redox reaction which involves both reduction and oxidation process. During corrosion a metal loses electrons and becomes oxidized to form a metal ion.  Therefore, oxygen is the oxidizing agent since it undergoes reduction by gaining electrons.

A substance that contributes electrons to another chemical species, reducing it, is known as a reducing agent. Strong reducing agents include several metal hydrides as well as active metals including sodium, potassium, and calcium. These reducing substances have the ability to form hydroxide ions (OH⁻) and hydrogen gas (H₂) when they come into contact with water.

Therefore, during corrosion of iron, iron is the reducing agent and gives electrons, while oxygen is the oxidizing agent and accepts the electrons.

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Answer:

CH3CH2CH2CH2CH2CH2OH-HEXAN-1-OL

Explanation:

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The molality of a solution containing 275.0-grams of methane, CH₄, dissolved in 300.0-m L of water is 57.3 M.

The molality of a solution containing 275.0-grams of methane, CH₄, dissolved in 300.0-m L of water is calculated as follows;

The molarity of a solution is defined as the ratio of number of moles of solute to the volume of the solution in liters.

The number of moles of  275.0-grams of methane, CH₄ is;

n = 275 / 16

n = 17.19 moles

The volume of the solution in liters = 0.3 L

The molality of a solution containing 275.0-grams of methane, CH₄, dissolved in 300.0-m L of water is ;

= 17.19 moles / 0.3 L

= 57.3 M

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Answer:

4 the number of figures

Explanation:

answers above

Answer:

cactus

Explanation:

Its a plant so it makes it own food

Answer:

câu trả lời trong hình ảnh

Answer:

Nicotine is classified as a stimulant drug.

The mass, in metric tons, of carbon in the methane is 1.83 metric tons

From the question, we are to determine the quantity of carbon in the methane

The mass of carbon in the methane can be calculated from

Mass of carbon in the methane = \(\frac{Mass\ of\ carbon\ in\ a\ molecule\ of \ methane}{Mass\ of\ a\ molecule\ of \ methane}\times Total\ mass\ of\ the\ methane\)

Mass of carbon in a molecule of methane = 12 g

Mass of a molecule of methane = 16 g

Therefore,

Mass of carbon in the methane = \(\frac{12}{16} \times 2.44\)

Mass of carbon in the methane = 1.83 metric tons

Hence, the mass, in metric tons, of carbon in the methane is 1.83 metric tons

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As the reaction between the two gases proceeds, the volume of the container will decrease due to the formation of a new gas, XY, which takes up less space than the two gases combined.

In a closed system, the decrease in volume is accompanied by an increase in pressure, as the molecules of XY have less space to move around in than the molecules of X and Y.

This is because the increased pressure will cause the molecules to move faster, thereby increasing the kinetic energy of the system. This increase in temperature will cause the reaction to speed up, leading to more molecules of XY being formed. As the reaction continues, the pressure, temperature, and volume will continue to change in a dynamic equilibrium until all the reactants are used up.

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A gas occupies 900.0 mL at a temperature of 27.0°C. What is the volume if the temperature is 105°C ?

Explanation:

\( \frac{V _{1} }{T _{1}} = \frac{V _{2} }{T _{2}} \\ \frac{(900)}{(27 + 273)} = \frac{V _{2}}{(105 + 273)} \\ V _{2} = \frac{340200}{300} \\ V _{2} = 1134 \: ml\)

Answer:

Sulfuric acid contains 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.

Explanation:

Answer:

D

Explanation:

Protons and Neutrons both have a mass of about 1 amu so you add them but electrons have a mass of 0 amu so they are left out.

The number of moles of gas in the canister can be calculated using the ideal gas law equation:

PV = nRT,

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Rearranging the equation to solve for n, we have n = PV / RT. Plugging in the given values, we have n = (0.750 atm) * (0.859 L) / (0.0821 atm·L/mol·K) * (176 K) ≈ 0.045 moles of gas.

The ideal gas law relates the pressure, volume, temperature, and the number of moles of a gas. By rearranging the equation and plugging in the given values, we can solve for the number of moles of gas in the canister. In this case, the pressure is 0.750 atm, the volume is 0.859 L, the temperature is 176 K, and the ideal gas constant (R) is 0.0821 atm·L/mol·K.

After performing the calculation, we find that the canister contains approximately 0.045 moles of gas. This calculation assumes that the gas in the canister behaves ideally, meaning it follows the assumptions of the ideal gas law, such as negligible molecular size and interactions between gas molecules.

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The isomer that cannot form an H-bonding interaction with another identical molecule, but can do so with a water molecule, is the primary amine isomer (C3H9N).

The primary amine isomer (C3H9N) has the following structure: H3C-CH2-CH2-NH2.This isomer cannot form H-bonding interactions with another identical molecule because it lacks a hydrogen atom bonded to the nitrogen atom. In order for H-bonding to occur between two molecules, there must be a hydrogen atom bonded to an electronegative atom (such as nitrogen, oxygen, or fluorine) and a lone pair of electrons on the electronegative atom.

In the case of the primary amine isomer, there is only one hydrogen atom bonded to the nitrogen atom, and it is already involved in forming an H-bond with a water molecule.However, the primary amine isomer can form an H-bonding interaction with a water molecule. The lone pair of electrons on the nitrogen atom can act as a hydrogen bond acceptor, while the hydrogen atom bonded to the nitrogen can act as a hydrogen bond donor. This interaction can occur between the lone pair of electrons on the oxygen atom of water and the hydrogen atom bonded to the nitrogen of the primary amine isomer.

In summary, the primary amine isomer (C3H9N) cannot form an H-bonding interaction with another identical molecule due to the lack of a hydrogen atom bonded to the nitrogen. However, it can form an H-bonding interaction with a water molecule.

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Answer:

3. Chemical energy

Explanation:

The command that allows moving a file from one location to another is the "mv command".

The mv command renames or transfers files and folders from one directory to another. A file or directory keeps its base file name when moved to a new directory. All links to other files are preserved when you transfer a file, with the exception of when you move it to a different file system. A directory and its contents are added beneath the existing directory when you transfer a directory into it.

The TargetDirectory option of the mv command allows you to provide a new file name or a new directory path name when renaming a file or directory.

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The birth rate is obtained to be 1.36 births per year

The birth rate is typically calculated as the number of births per 1,000 people in a given population over a specific period of time.

The formula that we can use so as to obtain the birth rate can be given as;

Birth rate = (Number of births / Population) x 1,000

We can find the birth rate from;

5.7 x 10^3 / 4.2 x10^6  x 1,000

1.36 births per year

This calculation provides an estimate of the number of births per 1,000 people in the population over a specific time period.

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Answer:

32.711

Explanation:

1 yard = 0.0009144 km

1 week = 168 hrs

6.01 x 10^6 / 168 = 35,773.81 yds/hr

                            =  32.711 km/hr