1. High levels of photochemical smog are due to I. nitrogen dioxide. II. sulfur dioxide. III. VOCs.

The number of particles in 28.5 g of sodium chloride, NaCl is 2.93×10²³ particles

From Avogadro's hypothesis,

1 mole of NaCl = 6.02×10²³ particles

But,

1 mole of NaCl = 23 + 35.5 = 58.5 g

Thus, we can say that:

58.5 g of NaCl = 6.02×10²³ particles

58.5 g of NaCl = 6.02×10²³ particles

Therefore,

28.5 g of NaCl =

\( \frac{28.5 \times 6.02 \times {10}^{23} }{58.5} \)

Thus, the number of particles in 28.5 g of sodium chloride, NaCl is 2.93×10²³ particles

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Answer:

CaCO3

Explanation:

E.F. is looking for the lowest possible ratio

In a voltaic cell, also known as a galvanic cell, the spontaneous redox reaction generates an electric current. The correct statement about voltaic cells and electrolytic cells is (c) "In a voltaic cell, electrons travel from the cathode to the anode in solution."

In a voltaic cell, also known as a galvanic cell, the spontaneous redox reaction generates an electric current. The anode, where oxidation occurs, is the site of electron loss, while the cathode, where reduction occurs, is the site of electron gain.

Electrons flow from the anode to the cathode through an external circuit, providing the electrical current. This movement of electrons in a voltaic cell is from the cathode (positive electrode) to the anode (negative electrode) in the external circuit.

In contrast, in an electrolytic cell, a nonspontaneous redox reaction is driven by an external electrical source.

The anode becomes the positive electrode where oxidation occurs, and the cathode becomes the negative electrode where reduction occurs.

Electrons flow from the external source to the anode (positive electrode), opposite to the direction of electron flow in a voltaic cell.

Therefore, statement (c) correctly describes the direction of electron travel in a voltaic cell.

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Answer:

CaCO3

Explanation:

answer attached

hope this helps!

The statements are related to a postulate of the kinetic molecular theory of gases is gas particles are in constant motion and are very far apart compared to their size. Therefore, option B is correct.

According to kinetic molecular theory, gas particles are in constant motion and have perfectly elastic collisions. Both Charles' and Boyle's laws can be explained using kinetic molecular theory. The average kinetic energy of a gas particle collection is only proportional to absolute temperature.

The kinetic-molecular theory is a theory that explains matter states and is based on the idea that matter is made up of tiny particles that are constantly in motion. The theory contributes to the understanding of observable properties and behaviors of solids, liquids, and gases.

Gas particles are in constant motion and are very far apart in comparison to their size, according to a postulate of the kinetic molecular theory of gases.

Thus, option B is correct.

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Answer:

62.58200 centimeters

Explanation:

Hope this helps!

Answer:

Calcium chloride

Explanation:

Sublimation is the process whereby a solid substance is converted to gas when heat is applied. Solid normally gets converted to the liquid phase before reaching the gaseous phase but these substances gets converted from solid straight to gas

Solid—> Gas

Dry ice( solid CO2) and Ammonium chloride undergo sublimation while Calcium chloride doesn't.

Ammonium chloride

Answer:

Removing the cap from a soft drink bottle releases pressure and causes the excess carbon dioxide molecules to come out as bubbles. however the drink is still supersaturated , and will release that carbon dioxide till it goes flat

Firstly, divide the number of atoms by Avogadro's number:

moles = (2.87 x 10^21 atoms) / (6.022 x 10^23 particles/mole)

moles = (2.87 x 10^21 atoms) / 6.022 x 10^23 particles/mole

moles = 0.00477 moles

So, there are 0.00477 moles of Mo in the sample.

Mo is the chemical symbol for Molybdenum. Molybdenum is a chemical element with the atomic number 42, which means it has 42 protons in its nucleus. It is a metal with a high melting point and is used in various applications, including as a component of steel alloys, catalysts, and electronics.

Molybdenum is a transition metal, and as such, it is relatively unreactive compared to other elements in its group. It is not highly reactive because it does not readily undergo chemical reactions with other factors under normal conditions.

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There are 0.00477 moles of Mo in the sample.

Mo is the chemical symbol for Molybdenum. Molybdenum is a chemical element with the atomic number 42, which means it has 42 protons in its nucleus. It is a metal with a high melting point and is used in various applications, including as a component of steel alloys, catalysts, and electronics.

Molybdenum is a transition metal, and as such, it is relatively unreactive compared to other elements in its group. It is not highly reactive because it does not readily undergo chemical reactions with other factors under normal conditions.

Firstly, divide the number of atoms by Avogadro's number:

\(moles = (2.87 \times 10^{21} atoms) / (6.022 \times 10^{23} particles/mole) \\moles = (2.87 \times 10^{21} atoms) / 6.022 \times 10^{23} particles/mole\\moles = 0.00477 moles\)

So, there are 0.00477 moles of Mo in the sample.

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Answer:

Very sweet tea

Explanation:

yeah... because sweet tea can cause tooth decay in our mouth thats why...(Please check the other answers also...Its all my point of view....thank you)

The closest relative to HIV-1 is Chimp SIV.

HIV-1 is believed to have originated in chimpanzees that were infected with simian immunodeficiency virus (SIV).

Specifically, the strain SIVcpz found in the subspecies Pan troglodytes troglodytes is associated with the transmission of SIV to humans.

The transmission occurred through the hunting and butchering of chimpanzees for food.

SIV is a retrovirus that causes immunosuppression or weakens the immune system in infected primates.

In some species of African nonhuman primates, such as sooty mangabeys and African green monkeys, SIV infections are normal and asymptomatic.

Therefore, Chimp SIV is considered the closest relative to HIV-1

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There are 6 chemically non-equivalent carbons in Meperidine and 9 chemically non-equivalent carbons in the Hydrolysis product of the Solanaceae Alkaloid Atropine.

Meperidine is an analgesic compound with the chemical formula C15H21NO2. It contains 6 chemically non-equivalent carbons. The six chemically non-equivalent carbons in meperidine are:

The Hydrolysis product of the Solanaceae Alkaloid Atropine is a compound with the chemical formula C17H23NO3. It contains 9 chemically non-equivalent carbons.

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225.0 g of water releases -33,646.125 J of heat energy when it cools from 85.5°C to 50.0°C.

To calculate the amount of heat released when water cools, we can use the formula:

Q = m * c * ΔT

Where:

Q is the heat energy in joules,

m is the mass of the water in grams,

c is the specific heat of water in J/g•°C,

ΔT is the change in temperature in °C.

Given:

m = 225.0 g

c = 4.18 J/g•°C

ΔT = (50.0°C - 85.5°C) = -35.5°C (negative because the water is cooling)

Substituting these values into the formula, we have:

Q = 225.0 g * 4.18 J/g•°C * (-35.5°C)Q = -33,646.125 J

The negative sign indicates that heat is being released by the water as it cools. Therefore, 225.0 g of water releases -33,646.125 J of heat energy when it cools from 85.5°C to 50.0°C.

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Answer:

9.8g

Explanation:

Using periodic table find molar mass of C and H:

C=12.01g/mol

H=1.008g/mol

Molar mass of C2H4=(12.01)2+(1.008)4=28.03g/mol

Using molar mass times moles of the chemical to find the mass in 0.35 moles of c2h4:

28.03 x 0.35=9.8grams

2 C4H10 + 13 O2 → 8 CO2 + 10 H2O.

Answer:

Ozon prevents us from UV rays of the sun. Ozone hole means that UV rays are entering the Earth. This results in cancer.

Explanation:

Chlorofluorocarbons are causing this

Answer:

The term ‘ozone hole’ refers to the depletion of the protective ozone layer in the upper atmosphere (stratosphere) over Earth's polar regions. People, plants, and animals living under the ozone hole are harmed by the solar radiation now reaching the Earth's surface—where it causes health problems, from eye damage to skin cancer.

Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.

Answer: Anaphylaxis

Explanation:

I have a nut allergy, and this has happened to me once. The doctors also told me a lot about anaphylaxis, and I like to learn about myself.

I hope this helps!! :)

Answer:

only student B

Explanation:

five electrons int eh valence shell of nitrogen atoms

Answer:

Like signs.

Explanation:

When two charges are like signs, a repelling force will occur.

Answer: assume pathogens are present and treat the samples accordingly

Explanation:

When investigators are unable to conclusively ascertain the source of a biological sample found at a crime scene, the correct thing to do is to treat it as if pathogens are present in it and handle it according to set rules on how to handle pathogens.

This is done to ensure that if a pathogen is indeed present, it would not cause a health emergency by infecting those who come in contact with the samples at the scene.

Magnesium or metal reacts with oxygen to produce magnesium oxide or metal oxide. The mass of oxygen needed to completely react with magnesium is 64 g.

Mass is the weight or the quantity of the substance that is estimated in grams and kilograms.

The balanced reaction can be given as:

\(\rm 2Mg + O_{2} \rightarrow 2MgO\)

From the balanced reaction, 2 moles of magnesium and 1 mole of oxygen are required to produce 2 moles of magnesium oxide.

If 2 mol Mg requires 1 mol oxygen then, 4 mol Mg will need 2 mol of oxygen.

The mass of oxygen can be calculated as:

\(\begin{aligned}\rm mass &=\rm molar\; mass \times moles \\\\&= 32 \times 2\\\\&= 64 \;\rm gm\end{aligned}\)

Therefore, option B. 64 gm of oxygen are required.

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Answer:

when we do increased activity our body requires more energy and therefore more oxygen and

therefore heart has to pump blood much faster and that's why increase heart rate

Answer:

do some jumping activity and other exercises

Explanation:

hope it helps

Measuring tools like Clear ruler, yardstick, measuring tape etc. They are very useful for the perfect fit and shape of any garment and even home furnishing.  

Sewing is the craft of fastening or attaching objects using stitches which is made up of a sewing needle and thread.

Measuring tools are the instruments used by practitioners and researches to aid in the assessment or evaluation of the subjects, clients or patients etc. These instruments are used to measure or collect the data on a variety of variables ranging from psychosocial wellbeing or physical functioning.

Measuring tools in sewing are as follows: Measuring tape, clear ruler, quilting ruler, yardstick, French curve etc.

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A droplet of CH3(CH2)14NH3 is placed into a beaker of hexane, the compound would likely show limited solubility, resulting in phase separation between the CH3(CH2)14NH3 droplets and the hexane solvent. The nonpolar nature of hexane would restrict interactions and reactivity between the CH3(CH2)14NH3 and the solvent molecules.

When a droplet of CH3(CH2)14NH3 (a long-chain alkylammonium compound) is placed into a beaker of hexane (a nonpolar solvent), we can predict the following:

1. Solubility: Since hexane is a nonpolar solvent, it has a low affinity for polar or ionic compounds. CH3(CH2)14NH3 is a quaternary ammonium compound with a positively charged NH3+ group. As a result, it is more likely to be soluble in polar solvents such as water rather than nonpolar solvents like hexane. Therefore, the CH3(CH2)14NH3 droplet would be insoluble or only sparingly soluble in hexane.

2. Phase Separation: Given the difference in solubility between CH3(CH2)14NH3 and hexane, phase separation would occur. The CH3(CH2)14NH3 droplet would likely form a separate phase within the hexane, typically as small droplets or aggregates that do not mix uniformly with the solvent.

3. Limited Intermolecular Interactions: In the hexane phase, the long hydrocarbon chain of CH3(CH2)14NH3 would be surrounded by nonpolar hexane molecules, leading to weak intermolecular interactions. The polar NH3+ group would be less favorable to interact with the nonpolar hexane molecules, further reducing any possible solubility.

4. Limited Reactivity: In a nonpolar solvent like hexane, the chemical reactivity of CH3(CH2)14NH3 would be diminished compared to its reactivity in polar solvents. Many chemical reactions and interactions typically occur more readily in polar solvents due to the increased ability to solvate and stabilize charged or polar species.

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Answer:

where are the statements??

Carbon dioxide remains in the atmosphere and warms our planet by trapping heat (illustrates the greenhouse effect).

1. The greenhouse effect occurs when certain gases, including carbon dioxide, trap heat in the Earth's atmosphere, leading to global warming.

2. Polar ice cores contain air pockets that provide information about past atmospheric conditions, allowing scientists to understand and measure changes over thousands of years.

3. Carbon dioxide (CO2) is one of the primary greenhouse gases targeted when studying the warming effects of human activities on the climate.

4. Melting ice attached to continental land masses, such as glaciers in Antarctica, contributes to subsidence, increased ocean temperatures, and rising sea levels.

5. Deforestation reduces the number of trees available for photosynthesis, leading to a decrease in photosynthetic output and carbon fixation to sugar. This results in increased levels of carbon dioxide in the atmosphere, contributing to climate change.

6. Fracking is a process used to extract natural gas from fissure cracks in rocks. It has been associated with increased seismic activity, water contamination, and involves techniques such as directional drilling and the use of solvents, water, and sand.

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Answer:

C₃H₅N₃O₉

Explanation:

Molar mass of nitroglycerin (Ratio of mass and moles of the compound) is:

1.00g / 0.0041mol = 226.8g/mol

We can write the equations:

0.6H = C (1)

-60% as many carbon atoms as hydrogen atoms-

3N = O (2)

C = N

Using as basis the atoms of Carbon:

Carbon = 1

Nitrogen = 1

Oxygen = 3

Hydrogen = 1/0.6 = 1.67

A molecular formula has just whole numbers. This ratio of atoms times 3:

Carbon = 3

Nitrogen = 3

Oxygen = 9

Hydrogen = 5

C₃H₅N₃O₉. Molar mass of this formula is:

C = 12.01g/mol*3 = 36.03g/mol

H = 1.01g/mol*5 = 5.05g/mol

N = 14g/mol*3 = 42g/mol

O = 16g/mol*9 = 144g/mol

Molar mass:

36.03g/mol + 5.05g/mol + 42g/mol + 144g/mol = 227g/mol ≈ 226.8g/mol

That means molecular formula of nitroglycerin is:

The molecular formula of nitroglycerin is C₃H₅O₉N₃

Mass of nitroglycerin = 1.00 g

A number of moles of nitroglycerin =  0.0041 mol

It is required to calculate the molecular formula of nitroglycerin.

An empirical formula tells us the relative ratios of different atoms in a compound.

The molecular formula of nitroglycerin can be estimated with the help of empirical formula.

The molar mass of nitroglycerin (Ratio of mass and moles of the compound) is:

1.00g / 0.0041mol = 226.8 g/mol

We can write the equations:

0.6H = C (1)

-60% as many carbon atoms as hydrogen atoms-

3N = O (2)

C = N

Using as basis the atoms of Carbon:

Carbon = 1

Nitrogen = 1

Oxygen = 3

Hydrogen = 1/0.6 = 1.67

A molecular formula has just whole numbers. This ratio of atoms times 3:

Carbon = 3

Nitrogen = 3

Oxygen = 9

Hydrogen = 5

C₃H₅N₃O₉.

Molar mass of this formula is:

C = 12.01g/mol*3 = 36.03g/mol

H = 1.01g/mol*5 = 5.05g/mol

N = 14g/mol*3 = 42g/mol

O = 16g/mol*9 = 144g/mol

Molar mass:

36.03g/mol + 5.05g/mol + 42g/mol + 144g/mol = 227g/mol ≈ 226.8g/mol

That means molecular formula of nitroglycerin is:

C₃H₅N₃O₉

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Answer:

...are in constant motion

Explanation:

Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in and also the state of matter as well.