Calculate the [SO42−] in 0.20 M H2SO4.
a. 4.3 × 10−2 M
b. 8.4 × 10−2 M
c. 1.1 × 10−2 M
d. 6.4 × 10−1 M
e. 2.5 × 10−1 M

The type of reaction in which substances are combined to form more complex substances is called a synthesis reaction.

This type of reaction involves two or more reactants coming together to form a single, more complex product. The product of a synthesis reaction will have a higher molecular weight than the reactants. An example of a synthesis reaction is the combination of hydrogen and oxygen to form water (2H2 + O2 → 2H2O). The type of reaction in which substances are combined to form more complex substances is called a synthesis reaction. In a synthesis reaction, two or more reactants combine to form a single, more complex product. This process often involves the formation of new chemical bonds between the reactants. Synthesis reactions are essential in various fields, such as chemistry, biology, and materials science, as they help create complex molecules and compounds from simpler components. Overall, synthesis reactions contribute significantly to the development of new substances and materials.

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Answer:

Helium Nucleus

Explanation:

Answer:

Helium Nucleus

Explanation:

The drift speed of electrons in this aluminum wire is 1.12 × 10⁻³ m/s.

The drift speed of electrons in a wire can be calculated using the following formula;

v_d = I/(n × A × q)

where; v_d = drift speed of electrons (m/s)

I = current (A)

n = number of the charge carriers per unit volume (m⁻³)

A = cross-sectional area of the wire (m²)

q = charge of each electron (C)

First, we need to calculate the number of charge carriers per unit volume (n) using the density of aluminum (ρ), its molar mass (M), and Avogadro's number (N_A);

n = (ρ × N_A) / M

Given; Cross-sectional area of the wire (A) = 4.0 mm² = 4.0 × 10⁻⁶ m²

Current (I) = 6.0 A

Density of aluminum (ρ) = 2.7 g/cm³ = 2.7 × 10³ kg/m³ (since 1 g/cm³ = 10³ kg/m³)

Molar mass of aluminum (M) = 27 g/mol

Avogadro's number (N_A) = 6.022 × 10²³ particles/mol

Charge of each electron (q) = 1.6 × 10⁻¹⁹

Let's calculate n first; n = (ρ × N_A) / M

n = (2.7 × 10³ kg/m³ × 6.022 × 10²³ particles/mol) / 27 g/mol

n = 1.186 × 10²⁹ electrons/m³

Now we can put in the given values, along with the calculated value of n, into the drift speed formula to find v_d;

v_d = I / (n × A × q)

v_d = 6.0 A / (1.186 × 10²⁹ electrons/m³ × 4.0 × 10⁻⁶ m² × 1.6 × 10⁻¹⁹ C)

v_d ≈ 1.12 × 10⁻³ m/s

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The emission spectrum of hydrogen is a series of colored lines that are produced when an electron in a hydrogen atom falls from a higher energy level to a lower energy level.

The spectral lines in the hydrogen emission spectrum correspond to different energy transitions within the atom. The energy of a photon is directly proportional to its frequency, so the emission lines correspond to specific frequencies of light.  The emission spectrum of hydrogen consists of a series of discrete lines, called the Balmer series, which correspond to specific wavelengths of light emitted when electrons in a hydrogen atom transition from higher energy levels to lower ones.

This emission spectrum is related to the energy levels in the hydrogen atom as follows:
1. When an electron in a hydrogen atom absorbs energy, it jumps to a higher energy level, also known as an excited state.
2. The electron then releases the absorbed energy in the form of a photon when it transitions back to a lower energy level. The energy of the emitted photon corresponds to the difference between the two energy levels involved in the transition.
3. The distinct lines in the emission spectrum represent the specific energy differences between these energy levels, and each line corresponds to a unique transition between two energy levels.  In summary, the emission spectrum of hydrogen is a direct result of electrons transitioning between different energy levels in the atom, and the specific wavelengths of light emitted correspond to the energy differences between these levels.

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The compound that does not conform to the law of constant proportion law is is CO2 whose ratio by mass ought to be 8:3 and not 3:4.

The law of constant proportions portrays the ideas that the composition of a pure sample of a substances has a fixed composition by mass.

Following the law of constant proportion, the compound that does not conform to this law is is CO2 whose ratio by mass ought to be 8:3 and not 3:4.

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Answer:

your cool

Explanation:

The matching words are;

A. Breaking; forming; positive.

B. Twice; half.

A. The reaction results in the formation of twenty blue-red bonds after the breakdown of five blue-blue and twenty blue-red bonds. Bond-breaking enthalpies are usually positive.

B. It is assumed that both reactants and products in the reaction shown are in the gas phase. The products include twice as many gas molecules, while the reaction's delta S value is just 50%.

Bond enthalpy measures the amount of energy needed to break a mole of a specific bond and is always positive because it is an endothermic reaction.

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Missing parts;

Match the words in the left column to the appropriate blanks in the sentences on the right. Note that some words may be used more than once and some may not be used.

1. breaking

2. forming

3. positive

4. negative

5. twice

6. half

A. The reaction involves___five blue-blue and twenty blue-red bonds and then____twenty blue-red bonds. Enthalpies for bond breaking are always_____.

B. In the depicted reaction, both reactants and products are assumed to be in the gas phase. There are___as many molecules of in the products, delta S is___for this reaction

Answer:

1. B

2.C

3.D

4.Sorry don't this one :(

5.A

Explanation:

please give me at least 20 points ❤

Based on the description of the graph, the law that is based on it is A. Boyle's law.

Boyle's law states that, at a constant temperature, the pressure and volume of a gas are inversely proportional to each other. In other words, as the volume of a gas decreases, the pressure increases, and vice versa, when the temperature remains constant.

The graph described shows a curve that starts high on the horizontal axis (indicating a large volume) and curves toward the origin, indicating a decrease in volume. As the volume decreases, according to Boyle's law, the pressure of the gas would increase. The leveling out of the curve as it approaches the horizontal axis suggests that there is an equilibrium point where the pressure and volume have stabilized.

Therefore, the graph aligns with the behavior predicted by Boyle's law, which establishes the inverse relationship between pressure and volume for a given amount of gas at a constant temperature. Therefore, Option A is correct.

The question was incomplete. find the full content below:

Which law is based on the graph that is shown below?

A graph is shown with pressure on the horizontal axis and volume on the vertical axis. A curve starts high on the horizontal axis, curves toward the origin, and then starts to level out as it approaches the horizontal axis.

A. Boyle’s law

B. Charles’s law

C. Dalton’s law

D. Gay-Lussac’s law

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Answer:

isotope

isotope

isotope

isotope

isotope

isotope

isotope

isotope

isotope

Answer:

Particle take 0.11 min to travel 158 m distance.

Explanation:

Given data:

Speed of particle = 1.5 Km/m

Distance to cover = 158 m (158/1000 = 0.158 Km)

Time taken = ?

Solution:

Formula:

s = d/t

s = speed

d = distance

t = time

Now we will put the values in formula.

1.5 Km/m = 0.158 Km / t

t = 0.158 Km /1.5 Km/m

t = 0.11 min

Thus, particle take 0.11 min to travel 158 m distance.

Answer:

Oxygen travels to insect tissues through tiny openings in the body walls called spiracles, and then through tiny blind-ended, air-filled tubes called tracheae.

The structure in insects that allows oxygen to diffuse into their body is the spiracle.

Insects are animals that belong to the class Insecta in the phylum Arthropoda. They have a segmented body that is divided into 3 majors parts:

In addition, insects have jointed appendages and an exoskeleton made largely of chitinous proteins.

Gaseous exchange in insects is tracheal. The trachea is a network of tubes that lead to openings in the body of insects known as spiracles. In other words, air enters through the spiracle and connects to the trachea tubes where gaseous exchange occurs.

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Mg(s) + 2HCl(ag) + MgCl2(ag) + H2
If 1.53 g magnesium reacted,0.064 g of hydrogen gas is produced.

From the balanced chemical equation, 1 mole of magnesium reacts with 2 moles of hydrochloric acid to produce 1 mole of hydrogen gas.
The molar mass of magnesium is 24.31 g/mol. Therefore, the number of moles of magnesium in 1.53 g of magnesium is:

1.53 g / 24.31 g/mol = 0.063 moles

According to the balanced chemical equation, 1 mole of magnesium produces 1 mole of hydrogen gas. Therefore, 0.063 moles of magnesium produce 0.063 moles of hydrogen gas.

The molar mass of hydrogen is 1.008 g/mol. Therefore, the mass of 0.063 moles of hydrogen gas is:
0.063 moles x 1.008 g/mol = 0.064 g
So, 0.064 g of hydrogen gas is produced.

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Standard temperature and pressure (STP) is defined as a temperature of 0 degrees Celsius (273.15 Kelvin) and a pressure of 1 atmosphere (atm). The correct answer is C. Outdoors on a summer day.

While conditions may vary, outdoors on a typical summer day, the temperature and pressure are more likely to be close to the standard conditions. Inside a car tire (Option A), the air pressure can be higher than atmospheric pressure due to inflation. Above a bowl of ice water (Option B), the temperature may be lower than standard temperature. Above a pot of boiling water (Option D), the temperature is higher than standard temperature. At the top of a tall mountain (Option E), the atmospheric pressure is lower than at sea level, resulting in non-standard pressure. Therefore, the most likely location where the air would be at standard temperature and pressure is option C, outdoors on a summer day.

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Explanation:

To solve this question, we need to use the Hess's Law.

Hess's Law states that: in a chemical reaction, the heat released or absorbed is constant and independent of the number of steps the reaction goes through. That is, the law states that the enthalpy change of a chemical reaction depends only on its initial state and its final state.

Hess's Law is also known as the law of the sum of heats of reaction, because the enthalpy change is equal to the sum of the changes in the steps through which the chemical reaction passes (intermediate reactions). The calculation is performed as follows:

- If the chemical reaction is inverted, the sign of the enthalpy change must also be inverted;

- If the equation is multiplied, the enthalpy change must also be multiplied;

- If dividing the equation, the enthalpy change must also be divided.

So we're going to invert, divide, or multiply each given equation in order to get the equation that the question gives us.

The equation the question gives us is:

4Al(s) + 3MnO2(s) --> 2Al2O3 (s) + 3Mn(s)

Let's multiply the first equation by 2:

4 Al + 3 O2 --> 2 Al2O3

ΔH = -1676 * 2 = -3,352 kJ

Let's invert and multiply by 3 the second equation:

3 MnO2 -> 3 Mn + 3O2

ΔH = -521 * 3 * (-1)

ΔH = 1,563 kJ

Answer: -1,789 kJ

Answer:

Option C. By increasing the temperature

Explanation:

From the graphical illustration above, we see clearly that the volume and temperature of the gas are directly proportional. This implies that as the temperature increases, the volume will also increase and as the temperature decreases, the volume will also decrease. This can further be explained by using the ideal gas equation as shown below:

PV = nRT

P is the pressure.

V is the volume.

n is the number of mole.

R is the gas constant.

T is the temperature.

PV = nRT

Divide both side by P

V = nRT/P

Since n and P are constant, the equation above becomes:

V & T

V = KT

K is the constant.

The above equation i.e V = KT implies that:

As T increases, V will also increase and as T decreases, V will also decrease.

Considering the question given above,

The volume of the gas can be increased if the temperature is increased.

Organisms that reproduce sexually have offspring with greater variety because: B. The offspring get DNA from two parents, and it combines randomly.

Reproduction refers to a biological process through which living organisms (parents) mate to produce offspring.

Basically, there are two (2) main types of reproduction and these include;

During sexual reproduction, parent organisms produce offspring with greater variety because the genetic material of their parents are randomly combined to produce genetically-diverse offspring.

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Organisms that reproduce sexually have offspring with greater variety as a

result of offspring get DNA from two parents, and it combines randomly.

The DNA gotten from the daughter cells during meiosis involves the

production of unique cells from the parent cells

This is usually done by the daughter cells obtaining  DNA from both parent

and combining randomly. It doesn't mutate regularly as mutation represents

defects which occurs in cells.

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The elements in a group often look and behave similarly, because they have the same number of electrons in their outermost shell — the face they show to the world. Group 18 elements, on the far right side of the table, for example, have completely full outer shells and rarely participate in chemical reactions.

There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, for the easing the understanding of elements grouping of elements is done based on the way they behave in chemical reactions.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Grouping elements based on the way they behave in chemical reactions makes the study of elements in the periodic table much easier and comfortable.

Therefore, for the easing the understanding of elements grouping of elements is done based on the way they behave in chemical reactions.

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Answer:

So that we know how many electrons are thre in which shell and how many shells are present in an atom....

Explanation:

Hope it helps!!!

(a) Prandtl number:Prandtl number is a dimensionless quantity, and it represents the ratio of momentum diffusivity to thermal diffusivity. It is usually represented as Pr = v/α, where v is kinematic viscosity and α is thermal diffusivity. It is one of the key parameters that determine the flow characteristics of fluids. The Prandtl number can be determined by the following formula:Pr = μ*Cp/k = 0.001 * 1000 / 1 = 1The Prandtl number is 1.(b) Hydrodynamic and Thermal Boundary Layer:Thermal boundary layer and hydrodynamic boundary layer are the two types of boundary layers. The thermal boundary layer and hydrodynamic boundary layer have different lengths in fluid flow over a flat plate, and the thermal boundary layer is always longer than the hydrodynamic boundary layer because of the low thermal conductivity of the fluid.The ratio of the length of the thermal boundary layer to the length of the hydrodynamic boundary layer can be expressed as:δt/δ = (Pr)^1/2Where δt is the length of the thermal boundary layer, δ is the length of the hydrodynamic boundary layer, and Pr is the Prandtl number. The Prandtl number is greater than 1 for fluids with high viscosity and low thermal conductivity, and the thermal boundary layer is larger than the hydrodynamic boundary layer.Therefore, there is a relationship between the hydrodynamic and thermal boundary layer, and it is directly proportional to the square root of the Prandtl number. In summary, the thermal boundary layer and hydrodynamic boundary layer are related, and the Prandtl number plays a key role in their relationship.

The mole fraction of sodium chloride in the given solution containing 129 g of sodium chloride per 2.50 mol camphor is 0.469 or 46.9%.

To calculate the mole fraction of sodium chloride in the given solution, we need to first calculate the number of moles of sodium chloride present in the solution. Using the given mass of sodium chloride and its molar mass, we can calculate the number of moles of sodium chloride as follows:
Number of moles of sodium chloride = Mass of sodium chloride / Molar mass of sodium chloride
= 129 g / 58.5 g/mol = 2.21 mol
Now, to calculate the mole fraction of sodium chloride, we need to divide the number of moles of sodium chloride by the total number of moles in the solution. We are given that the solution contains 2.50 mol of camphor. Therefore, the total number of moles in the solution is:
Total number of moles in the solution = Number of moles of sodium chloride + Number of moles of camphor
= 2.21 mol + 2.50 mol = 4.71 mol
The mole fraction of sodium chloride can now be calculated as follows:
Mole fraction of sodium chloride = Number of moles of sodium chloride / Total number of moles in the solution
= 2.21 mol / 4.71 mol = 0.469 or 46.9%

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Answer:

0.0069

Explanation:

When converting between scientific notation try to remember that moving the decimal place to the left is positve and to the right is negative

Since you are changing from scientific to standard you will need to move to the left from the decimal point, making your answer 0.0069

The total reactive power absorbed by the line is: 120-J 160 VA

Given that, a load of 30 - j 40 is connected to a source of 100 v with a phase angle of 30o , through a transmission line with an inductive reactance of 80 ohms.

\(current, $I=I_L=\frac{100 \angle 30^{\circ}}{30-j 40+j 80}=\frac{100 \angle 30^{\circ}}{30+j 40}$\)

\($=2 \angle-23.13^{\circ}$\)

\($\begin{aligned} V_L &=\left(100\left(30^{\circ}\right)-I(j 80)\right.\\ &=\left(100 < 30^{\circ}\right)-(2 L-23.13)(j 80) \\ &=100 L-76.26 \text { volts. } \end{aligned}$\)

\($\begin{aligned} \text { Power delivered toads }=& V_l I_L^* \\=&(100 < -76.26)(2 L-23.13)^* . \\=&(100 < -76.26)(1.839-j 0.786)^* \\ &=(100 < -76.26)(1.839+j 0.786) \\ &=(100 < -76.26)(2 L+23.13) \\ S &=120-j 160 \mathrm{VA} \end{aligned}$\)

The component of complex power known as reactive power pertains to energy storage and retrieval rather than consumption. Real power, which really does work, and reactive power, which permits transformers to change, generators to produce, and motors to rotate, are the two types of power found in an AC power system.

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Answer:

90

Explanation: i think

Answer:

90 have 2 letters in their symbols

Answer:

It's answer is c) exactly 37 protons

Answer:

C) ,  Exactly 37 protons.

Explanation:

Remember the electrons have a negative charge, so to make a atom with 37 electrons neutral, you will need the same amount of the opposite type. That means you need 37 protons.

Chlorine may be added to water in a continuous, c.) Low dose method to initially disinfect a pipeline.

Chlorine can be added in a continuous low dose to maintain disinfection in the pipeline. This method is often used to prevent the growth of bacteria and other microorganisms in the water. Alternatively, a slug method may be used for an initial shock treatment, where a higher concentration of chlorine is added to the pipeline. Tablet or air injection methods may also be used for disinfection, but they are less commonly employed than the continuous or slug methods. Regardless of the method used, it is important to ensure that the chlorine is properly mixed and that the water is adequately monitored to ensure safe levels of chlorine and other content loaded in the water.

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The binding energy in MeV per atom is - 63284.56 Mev.

The amount of energy needed to detach a particle from a system of particles or to disperse every particle in the system is known as the binding energy. Subatomic particles in atomic nuclei, electrons attached to atom's nuclei, and atoms and ions bonded together in crystals are three examples of where binding energy is very relevant.

If we have a nucleus with Z protons and N neutrons and mass MA, where A = Z + N then its binding energy in MeV is given by: Eb(MeV) = (Zmp + Nmn - MA) x 931.494 MeV/u

Mass of atom = 69.955264 amu

Mass of proton = 1.007825 amu

Mass of neutron = 1.008665 amu

Binding energy, Mev = (Zmp + Nmn - M) × 931.494MeV/u

                                    = ( 1.007825 + 1.008665 -  69.955264) × 931.494

                                    = - 67.938774 × 931.494

                                    = - 63284.56 Mev

Therefore, the binding energy in MeV per atom is - 63284.56 Mev.

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Answer:

Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.

Answer:

Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum. Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.

Explanation:

710 mL volume in ml of 0.3000 m nacl solution is required to produce 0.2150 moles of nacl.

Molar Concentration = number of moles/ volume

volume = number of moles/ molar concentration

volume = 0.2150/ 0.3000 = 0.71  L

volume required = 0.71 L = 0.71L× 1000 mL/L = 710 mL

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