Which of the following is a chemical change?
A. Water vapor in the air turns to liquid water in the form of rain
B. The oxygen in the air forms ozone in presence of UV rays
C. Dust and soot particles being suspended in the air
D. Sulphur dioxide being released in the air

The net force on particle 3 due to the presence of particle 1 and particle 2 on the same straight line is 50.5 N to the right.

The force between the two particles is determined from Coulomb's law as shown below;

F = kq₁q₂/r²

F(1,2) = -(9 x 10⁹ x 28.1 x 10⁻⁶ x 25.5 x 10⁻⁶) / (0.3)²

F(1,2) = - 71.66 N

F(2,3) = + (9 x 10⁹ x 25.5 x 10⁻⁶ x 47.9 x 10⁻⁶) / (0.3)²

F(2,3) = + 122.15 N

The net force on particle 3 is determined as follows;

F(net) = 122.15 N - 71.66 N

F(net) = + 50.5 N

Thus, the net force on particle 3 due to the presence of particle 1 and particle 2 on the same straight line is 50.5 N to the right.

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The ionic equation:

2Mn\(O^{- }_{4}\) + 5 H2O4 + 6 \(H^{+}\)⇄  2\(Mn^{2+}\) + 10 CO2 + 8H2O

Molarity of KMnO4 is 0.0229M

Molarity:

Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of the amount of substance per unit volume of solution.

Formation of  the ionic equation:

2 × ( Mn\(O^{-}\)4)  + 8 \(H^{+}\) + 5\(e^{-}\) ⇄ \(Mn^{2+}\)  + 4 H2O )

5 × ( H2C2O4  ⇄ 2CO2  + 2\(H^{+}\)  + 2\(e^{-}\) )

_______________________________________

2Mn\(O^{-} _{4}\)  + 5 H2C2O4  + 6\(H^{+}\) ⇄ 2M\(n^{2+}\) + 10 CO2 + 8 H2O

Now we have to find the molarity of the permanganate,

Volume = 28.97ml

mass = 0.1058g

molecular mass = 0.105 × 1000/ 28.97

                          = 3.62g

molecular mass = 158

Molarity of the solution = mass/ molecular mass

                                       = 3.62/ 158

                                       = 0.0229M

Therefore the ionic equation is 2Mn\(O^{- }_{4}\) + 5 H2O4 + 6 \(H^{+}\)⇄  2\(Mn^{2+}\) + 10 CO2 + 8H2O and the molarity of the permanganate solution is 0.0229M.

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Answer:

diamond

Explanation:

In this case, the primary structure forms hydrogen bonds to fold itself.

The answer is primary structure.

The chemical species predominantly present in solution that will determine the pH is water (H2O).

When you add Ba(OH)2 to HCl, a neutralization reaction occurs which forms water and a salt (BaCl2). The equation for this reaction is: Ba(OH)2 + 2HCl → BaCl2 + 2H2O

Since water is the main product of the reaction, it will be the chemical species predominantly present in the solution. The pH of water is 7, which means that the solution will be neutral. Therefore, the formula of the chemical species predominantly present in solution that will determine the pH is H2O.

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The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.

Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.

Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.

According to the given data;

Decomposition of carbon monoxide (CO);

Oxygen produced = 3.36 g

Carbon produced = 2.52 g

We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;

Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol

Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol

Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;

0.21 mol C / (0.21 mol O) = x

Simplifying the equation, we have;

x = 1

Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.

Decomposition of carbon dioxide (CO₂);

Oxygen produced = 9.92 g

Carbon produced = 3.72 g

Following the same calculations as before;

Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol

Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol

Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;

0.31 mol C / (0.62 mol O) = y

Simplifying the equation, we have;

y = 0.5

Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.

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--The given question is incomplete, the complete question is

"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--

True.

Boron trifluoride (BF3) is a polar molecule because it contains polar covalent bonds and the molecular geometry of the molecule is trigonal planar.

The boron atom has a partial positive charge while the fluorine atoms have a partial negative charge due to the electronegativity difference between them. This creates a net dipole moment in the molecule making it polar.

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Answer:

False

Explanation:

Cows and other livestock release methane, which is a gas like Carbon Dioxide, but not the same thing, even though it does contribute into Carbon Dioxide.

To determine the value of the rate constant (k) at 63 °C given the rate constant (k) at 16 °C and the activation energy (Ea), we can use the Arrhenius equation:

k2 = k1 * exp((Ea/R) * ((1/T2) - (1/T1)))

Where:

k1 = rate constant at temperature T1

k2 = rate constant at temperature T2

Ea = activation energy (in J/mol)

R = gas constant (8.314 J/(mol·K))

T1 = initial temperature (in Kelvin)

T2 = final temperature (in Kelvin)

First, we need to convert the temperatures from Celsius to Kelvin:

T1 = 16 + 273.15 = 289.15 K

T2 = 63 + 273.15 = 336.15 K

Now we can plug in the values into the Arrhenius equation:

k2 = (2.65×10^(-2) s^(-1)) * exp((88.5 * 10^3 J/mol) / (8.314 J/(mol·K)) * ((1/336.15 K) - (1/289.15 K)))

Simplifying the equation and calculating the value of k2 will give you the rate constant at 63 °C.

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The time required to electrolyze molten metal at a current of 30.0 A to yield 1.00 g of silver metal is 90 seconds.

Number of moles = given mass = 1.0 = 0.0093

                              molar mass   108  

According to the mole concept:

One mole of atoms contains 6.022 x 10²³ number of particles.

We know that:

charge of 1 electron = 1.6 x 10⁻¹⁹

Charge of 1 mol electron = 1.6 x 10⁻¹⁹ x 6.022 x 10²³ = 96500 C

AgNO₃⇒ Ag³⁺ +3NO₃⁻

At cathode :  Ag³⁺ +3e⁻ ⇒  Ag

1 mol of silver is deposited as follows:

3 x 96500 = 289500 C

So 0.0093 moles of silver is deposited as

289500 C X 0.0093 =2692.35 C  

     1

Use the following formula to calculate the required time:

I= q/t

where,

I =  current = 30 A

q = total charge = 2692.35 C

t = required time (seconds) = ?

Substituting the values ​​into the above formula, we get:

t= q/1

t = 2692.35 C / 30 A

t = 89.745 ≈ 90 s

Therefore, the time required to electrolyze molten metal at a current of 30.0 A to yield 1.00 g of silver metal is 90 seconds.

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Answer:

The correct answer is 0.59M

Answer:

See the answer below

Explanation:

The cell represents the basic unit of life and any living organism.

One example of specialized cells in the body are the sex cells.

The sex cells are primarily concerned with reproduction and perpetuation of life. The cells undergo meiosis to produce haploid gametes. Male and female gametes then fuse together during fertilization to give rise to diploid zygotes which eventually give rise to new organisms.

The planet's albedo has ability to reflect light.

The planetary albedo would be the percentage of incoming solar radiation that Earth scatters back into space. The processes that control the quantity, distribution, and fluctuation of this reflected energy are crucial to the Earth's energy balance and have a significant impact on both climate including climate change.

Temperatures rise as a result of carbon dioxide, prolonging the growing season as well as raising the humidity. Each of these elements has stimulated some further plant growth. But hotter weather also stresses plants. Plants require more water to live in an extended, warmer growing season.

Therefore,  the planet's albedo has ability to reflect light.

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Answer:

a

Explanation:

i hope i am right

Option (4) is correct. The rate constant of a second order reaction has the unit  L/mole. sec.

In the Second order reaction the rate is proportional to the square of the concentration of one reactant. Rate of Second order reaction  is proportional to the product of the concentrations of two reactants. Such reactions generally have the form,

A + B → products.

Each monomer combines to form a larger molecule is called dimer. For the units of the reaction rate to be moles per liter per second (M/s), the units of a second-order rate constant must be the inverse (M−1·s−1). Because the units of molarity are expressed as mole/L, the unit of the rate constant can also be written as L(mole ·s).

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Step 1:

ok we have to use the formula PV=nRT

p=Pressure (must be converted to atm)= 780 mmHg

1 amt= 760 mmHg use this as a conversion factor

780 mmHg (1 atm/760 mmHg)= 1.026

V= Volume= 5.00 mL = o.5 L

n=number of moles which we have to find first

R= 0.0821

T(convert to Kelvins by adding 273.15 to the celsius temperature)= 135 C + 273.15= 408.15 k

Now plug in->

(1.026 atm)(o.5 L)= n(0.0821)(408.15 K)

(1.026 atm)(0.5 L)= n(33.509115)

(0.513)= n(33.509115)

n(number of moles)= 0.01532 mol

Now we have to convert to moles using Avagodro's number which states that 1 mol = 6.022 x 10^23 molecules or atoms

So 0.01532 mol (6.022 x 10^23 number of molesules)/ (1 mol) = 9.225704 x 10^21 = 9.226 x 10^21 colecules

Step 2

You must transfer pressure into pascals, 780 mm Hg = 103991 Pa

135*C = 408.15 k

then from the equation pV = nRt

n = pV / RT (T in Kelvins, V in M^3)

n = 103991 x 500 x 10^-6 / (8.314 x 408.15)= 0.015322 moles of N2

1 mol of everything is 6.022 x 10^23 particles, so 0.15322 moles is 0.15322 x 6.022 x 10^23 = 9.2269084 x 10^21 molecules

Explanation:

Hope this helps :)

According to the balanced equation, 31.7 grams of nitrogen gas (N₂) reacting with excess hydrogen gas (H₂) will produce a 2.264 moles of ammonia gas (NH₃).

To determine the moles of ammonia formed, we need to convert the given mass of nitrogen gas to moles using its molar mass and the stoichiometric ratio of the balanced equation.

The molar mass of nitrogen gas (N₂) is 28.02 g/mol. To calculate the number of moles of nitrogen gas, we divide the given mass by its molar mass:

31.7 g / 28.02 g/mol = 1.132 mol

According to the stoichiometry of the balanced equation, the ratio between nitrogen gas and ammonia gas is 1:2. This means that for every 1 mole of nitrogen gas, 2 moles of ammonia gas are produced.

Therefore, using the stoichiometric ratio, we can determine the moles of ammonia formed:

1.132 mol N₂ * (2 mol NH₃ / 1 mol N₂) = 2.264 mol NH₃

Thus, upon the complete reaction of 31.7 grams of nitrogen gas with excess hydrogen gas, 2.264 moles of ammonia gas will be formed.

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Answer:

It's basically a positive charged atom.

Explanation:

The mitochondrial inner membrane contains succinate dehydrogenase, a respiratory enzyme involved in the citric acid cycle and electron transport chain. Succinate dehydrogenase catalyzes the dehydration of succinate, converting it to fumarate in step 6 of the cycle. Two hydrogens are transferred to FADH2 to reduce FAD.

In the citric acid cycle, α-ketoglutarate is a molecule that is converted to succinate, fumarate, malate and oxaloacetate in the following processes.

Succinate binding of the succinate dehydrogenase reaction is competitively inhibited by malonic acid. Citric acid cycle intermediates such as succinate, succinyl-CoA and α-ketoglutarate accumulate in the presence of malonic acid.

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The diagram that shows what has occurred is diagram D

If a substance changes color during the reaction, it can be a sign that a chemical change has occurred.

We can see from the image that we have been told that there is change in the color of the system and then when that happens, it would be clear that the molecules in the reactants must have stick together so that we can have the products of the reaction as shown.

Thus the image that shows a chemical reaction is image D

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If 178 g of Na₂CO₃ is dissolved in enough water to make 1400 ml of solution. The molarity of the concentration of sodium carbonate will be 1.19 M.

The number of moles of dissolved solute per liter of solution is the definition of molarity, a concentration unit. Molarity is defined as the number of millimoles per milliliter of a solution when the number of moles and the volume is divided by 1000.

Given,

Na₂CO₃ = solute

Mass of Na₂CO₃ = 178g

Molecular mass of Na₂CO₃ = 106 g

The number of moles of the solute = Given mass / molecular mass

= 178/106 = 1.67 moles

Volume of water (solvent) = 1400 ml = 1.4 l

Molarity = no of moles of solute/volume of solvent (in liters)

= 1.67/1.4 = 1.19 M

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The Cistercian order split from the Cluniac order to follow the rules of Saint Benedict more strictly.

The Cistercians, formally known as the Order of Cistercians (Latin: (Sacer) Ordo Cisterciensis, abbreviated as OCist or SOCist), are a Catholic religious order of monks and nuns who split off from the Benedictines and adhere to the Latin Rule, which incorporates Bernard of Clairvaux's contributions as well as the Rule of Saint Benedict. As a nod to the color of the "cuculla" or cowl (choir robe) worn by the Cistercians over their habits as opposed to the black cowl used by Benedictines, they are also known as Bernardines, after Saint Bernard himself, or as White Monks.

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In a sample of ground beef, there were 18.9% protein and 21.4% fat, both expressed in mass. Therefore, 125g of ground beef has 147.5 kilocalories.

The now-defunct kinetic theory of heat served as the basis for the calorie, a unit of energy. For historical reasons, the term "calorie" has two main definitions that are often employed.

Originally, the amount of heat needed to raise the temperature of one kg of water by one degree Celsius was referred to as a large calorie, dinner calorie, dietary nutrient, and kilo calorie (or one kelvin). A minuscule calorie or tiny calorie is the term used to describe the quantity of heat needed to produce the same increase in one kilogram of water.

The needed number of calories for ground beef is m.

protein in it = .18m

fat in it =  .21m

1 gram of protein gives 4 cals .

1 gram of fat gives 9 cals .

4 x .18m  + 9 x  .21m = 350

m = 147.5kilocalories

Therefore, 125g of ground beef has 147.5 kilocalories.

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A solution with a pH of 13.8 means that the solution is a strong base.

pH refers to power of hydrogen. The pH is a scale used to measure the degree of acidity or alkalinity of a solution.

pH scale ranges from 0 - 14

Where;

However, the closer the pH value is to 1, the more the acidity and vice versa while the closer it is to 14, the more the alkalinity and vice versa.

Therefore, a solution with a pH of 13.8 means that the solution is a strong base.

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Specific Heat of the metal will be = 4.184 J/C

Mass of metal = 28 g

Mass of water = 28 g

Rise in temperature = 23.8 - 19 = 4.8 C

Specific heat of water = 4.184 J/C

Let the specific heat of metal =S

The heat released by metal =mass of metal * specific heat of metal * Change in temperature

\(& =28\times S \times 4.8{ }^{\circ} \mathrm{C} \\& =134.4 S^{\circ} \mathrm{C}\)

Heat absorbed by water = mass of water x specific heat of water x change in temp. \(=28 \times 4.184 \times 4.8=562.3296 J\)

Using the principal of Caloriemeter:

We have, Heat released by metal = Heat absorbed by water

134.4S = 562.3296 =>4.184 J/C

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The correct question should be:

if we are heated a metal with 28g mass then we add it in a coffee cup with 28g water. the water temperature raised from 19 degree to 23.8 oc. what was the specific heat of the metal. the water specific heat of water is 4.184 j/g oc.

Answer:

30 miles

Explanation:

Answer:

15.06 L

Explanation:

Using the ideal gas law equation:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

According to the information provided in this question,

P = 3.50 atm

n = 1.9 moles

V = ?

T = 65°C = 65 + 273 = 338K

Using PV = nRT

V = nRT/P

V = (1.9 × 0.0821 × 338) ÷ (3.5)

V = 52.725 ÷ 3.5

V = 15.06 L