Pesticides are best described as _______. A. Polluting chemicals toxic to all living things b. Chemicals that destroy 33% of the world’s potential food supply c. Toxic chemicals used to control weed populations d. Toxic chemicals used to control pest populations Please select the best answer from the choices provided A B C D.

Answer:

Well, SCl2 is known, so is disulfur dichloride… Cl−S−S−Cl …and BOTH these species are molecular… On the other hand, lithium chloride, an ionic salt, is decidedly non-molecular, and consists of an infinite array of lithium and chloride ions held together by strong electrostatic forces ….. and thus we would expect the salt to have the much higher melting point….

The administered isotope will have an activity of 0.25625 micro curie reaching the liver, and it will take 15 days for the activity to reduce to half in the liver. The total time for the activity to reduce to half in the liver is 150 days.

To calculate the following parameters for the administered isotope, we will consider the given information:Initial activity: The initial activity of the administered isotope is 10.25 micro curie.Half-life of the isotope: The half-life of the isotope is 50 days. This means that after every 50 days, the activity of the isotope is reduced by half.

Liver's clearance half-life: The clearance half-life of the liver is 15 days. This means that the liver clears half of the activity it receives every 15 days.

Fraction of activity reaching the liver: Only 2.5% of the administered activity reaches the liver.Now let's calculate the parameters:

a. Activity reaching the liver: 2.5% of the initial activity is (2.5/100) * 10.25 micro curie = 0.25625 micro curie.

b. Time for the activity to reduce to half in the liver: The clearance half-life of the liver is 15 days, so the activity will reduce to half after 15 days.

c. Total time for the activity to reduce to half in the liver: Since the half-life of the isotope is 50 days and the clearance half-life of the liver is 15 days, we need to find the least common multiple (LCM) of 50 and 15. The LCM is 150 days.

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Note- the complete complete question is this

An isotope of 10.25 micro curie (Half-life is 50 days) was administered to the liver. If the liver's clearance half-life is 15 days and assumed that only 2.5% of activity reached the liver. Calculate the following? a) total number of decays in liver b) residence time c) cumulative activity d) dose from liver to liver. Assume S value of 2.1 x 10-7 (Rad/micro curie-h)

Electromagnetic radiation includes waves of the electromagnetic subject, which propagate through the area and deliver electromagnetic radiant electricity. It consists of radio waves, microwaves, infrared, mild, ultraviolet, X-rays, and gamma rays. All of these waves form part of the electromagnetic spectrum.

Electromagnetic waves are formed when an electric field couples with a magnetic area. The magnetic and electric powered fields of an electromagnetic wave are perpendicular to every different and to the path of the wave. Electromagnetic waves or EM waves are waves that can be created due to vibrations between an electric discipline and a magnetic discipline.

1. Type of electromagnetic waves that has the longest wavelength is radio waves

2. Type of electromagnetic wave that has the longest wavelength is gamma waves.

3. Another use of microwave radiation is Proofing yeast.

4. Objects in space that emit or give off radio waves (RADAR.

Radio Astronomy).

5. Range of microwaves is 1 - 10 ⁻³ m

6. The other common name for infrared rays is heat radiation.

7. To detect infrared rays radiation we use night-vision goggles.

8. Objects in space emit or give off ultraviolet light as Fluorescent Bulbs

9. To gather x-ray radiation we use radiography.

10. The electromagnetic radiation we are able to see with the eye is visible light.

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Answer:

Explanation:

The answer would be d

Answer:

The emission of electrons when light is shined on a metal.

Explanation:

When electromagnetic radiation (light) hits something/metal/material, there is emission of electrons [called "photoelectrons", which is what "photoelectric" is from]

Answer: i dont think anyone know because its ghard

Explanation:

The delta G for the dissociation is 87,865 joule/kg.

The process is non-spontaneous because the value of Gibbs free energy is positive.

The breaking up of a compound into a simpler form that can be recombined under other conditions.

Given,

\(\bold{2NH_3 (g) = N_2(g) + 3H_2(g)}\)

H = 145 kJ

Delta S = 195 J/k

Determining the G using the following process:

G = H -TS

\(\bold{G = (145\times10^3 J) -(293K \times 195 J/K})\)

G = 87,865 Joules/K

Thus, the value of Delta G is  87,865 and the process is non-spontaneous.

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Answer:

C. 87.9 kJ, nonspontaneous

Explanation:

just did the quiz

We can find the MFM of the compound by dividing the given molecular weight by the empirical formula weight.
Molecular weight of the compound is not given in the question, so we cannot calculate the molecular formula of the compound.

The given empirical formula is P2O5.

To obtain the molecular formula of the compound, we have to find its molecular weight.

The molecular formula of a compound is a multiple of its empirical formula mass.
The empirical formula mass of the compound can be obtained by adding the atomic masses of its constituent atoms. For the empirical formula P2O5, the atomic mass of one phosphorus atom (P) is 31.0 g/mol, and the atomic mass of one oxygen atom (O) is 16.0 g/mol.
Empirical formula mass (EFM) = 2 × atomic mass of P + 5 × atomic mass of O
EFM = 2 × 31.0 g/mol + 5 × 16.0 g/mol
EFM = 62.0 g/mol + 80.0 g/mol
EFM = 142.0 g/mol
The molecular formula mass (MFM) of the compound is a multiple of its empirical formula mass.

Therefore, we cannot determine the molecular formula of the compound with the given information.

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Answer:

mass matter

Explanation:

The statement "it is not the union that organizes the employees; it is management " means that :

This excerpt shows that although the union helps in the organization of employees for better and easy management of staffs by the management, the management creates an enabling environment by creating stipulations which allows the u ions to convince staffs to join and accept union representation in staff welfare matters.

Hence we can conclude that, the management creates the climate which allows the union to convince employees to accept union representation.

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The amount of charge that passed through the cell in 1 minute is 30 Coulombs.

In a galvanic cell, the flow of electric current is driven by a chemical reaction. The current represents the rate at which charge flows through the circuit. Charge is measured in Coulombs (C), and current is measured in Amperes (A). To calculate the amount of charge that passed through the cell, we can use the formula Q = I * t, where Q is the charge in Coulombs, I is the current in Amperes, and t is the time in seconds.

Given that the current is 0.50 A and the time is 1 minute, we first need to convert the time to seconds. There are 60 seconds in 1 minute, so the time becomes 60 seconds. Plugging these values into the formula, we have Q = 0.50 A * 60 s = 30 C.

Therefore, in the given scenario, a total of 30 Coulombs of charge passed through the galvanic cell in 1 minute. This indicates the amount of electrical charge transferred during the operation of the cell, providing useful information for various calculations and analysis related to the cell's performance.

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Answer:

When the bulb is turned on, an electrical current passes through the filament, heating it up so much that it emits light.

Explanation:

To find derivative symmetry operation through interaction of two symmetries, multiply the matrices for the two symmetries together, in the order that corresponds to the order in which we apply them. Here, we applied S₁ followed by S₂, so we multiplied S₂ times S₁. Resulting matrix corresponds to the composite symmetry.

Let's start by defining the two symmetries we are working with. We will call them S₁ and S₂, and we will represent them using matrices. The matrix for S₁ is:

[ 0  1 ]
[ 1  0 ]

The matrix for S₂ is:

[ 1  0 ]
[ 0 -1 ]

Now, to find the derivative symmetry operation, we need to multiply these two matrices together. However, we need to be careful about the order of multiplication, since matrix multiplication is not commutative. That is, S₁ times S₂ is not the same as S₂ times S₁.

To determine the correct order of multiplication, we need to consider how the two symmetries interact. When we apply S₁ followed by S₂, we first reflect the object across the line y=x (which is what S₁ does), and then we reflect it across the x-axis (which is what S₂ does). If we think about it, this is the same as reflecting the object across the line y=-x (which is a diagonal line that goes through the origin). So, we can represent this composite symmetry as a single matrix that corresponds to the reflection across y=-x.

To find this matrix, we simply multiply the matrices for S₁ and S₂ together, in the order S₂ times S₁. Here's how:

[ 1  0 ]   [ 0  1 ]   [ 0  1 ]
[ 0 -1 ] x [ 1  0 ] = [-1  0 ]

So, the matrix for the composite symmetry (which is the derivative symmetry operation) is:

[ 0  1 ]
[-1  0 ]

This matrix corresponds to the reflection across the line y=-x.

In summary, to find the derivative symmetry operation through interaction of two symmetries, we need to multiply the matrices for the two symmetries together, in the order that corresponds to the order in which we apply them. In this case, we applied S₁ followed by S₂, so we multiplied S₂ times S₁. The resulting matrix corresponds to the composite symmetry, which is the derivative symmetry operation.

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The mean wake time of 104.0 min before treatment is outside the 99% confidence interval of the mean wake time after treatment, it suggests that the drug is effective. This is further confirmed by the significant decrease in the mean wake time after treatment of 94.1 min. Therefore, it can be concluded that the drug is effective in treating insomnia in older subjects.

A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 16 subjects had a mean wake time of 104.0 min.

After treatment, the 16 subjects had a mean wake time of 94.1 min and a standard deviation of 23.7 min.

Assume that the 16 sample values appear to be from a normally distributed population and construct a 99% confidence interval estimate of the mean wake time for a population with drug treatments.

The formula for the confidence interval of the mean is:

\($$\overline{X} \pm z_{\alpha/2} \frac{s}{\sqrt{n}}$$\)

Here,

\($z_{0.005} = 2.576$\) for a 99% confidence interval as

\($α/2 = 0.005$\)

and the degrees of freedom is 15 since \($n-1=15$\).

Now, substituting all the values:

\($$94.1 \pm 2.576 \times \frac{23.7}{\sqrt{16}}$$\)

The calculation gives a 99% confidence interval estimate of the mean wake time of 94.1 ± 15.4 min (rounded off to one decimal place).

The mean wake time of 104.0 min before treatment is not within the 99% confidence interval of the mean wake time after treatment. This indicates that there is a significant decrease in the mean wake time after treatment.

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The entire amount of greenhouse gases (such as carbon dioxide and methane) produced by human actions is known as a carbon footprint. One of the highest rates in the world, the average carbon footprint of a person in the United States is 16 tonnes.

As we drive, heat our homes with oil or gas, consume fuel for transportation, or use electricity produced from coal, natural gas, or oil, we all emit greenhouse gases.

Described by the WHO as a weight of CO2, a carbon footprint is a measurement of the effect your actions have on the amount of carbon dioxide (CO2) created by the combustion of fossil fuels.

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The concentration of CO (g) in the equilibrium mixture is 0.020 M. In other words, only a small amount of CO (g) is produced in this reaction at 1000°C. T 0.020 M.

The concentration of CO in an equilibrium mixture (in mol/L) is 5.8 M.

Given that the concentration of H2O (g) is [H2O] = 0.500 M at 1000°C, and  the reaction is:

C(s) + H2O(g) ⇄ CO(g) + H2(g) KC = 0.2 at 1000°C

We need to determine the concentration of CO in an equilibrium mixture (in mol/L)

if a reaction mixture initially contains only reactants.

We can solve this problem using the ICE table method as follows:

Let x be the change in concentration of H2O (g) and CO (g) when they reach equilibrium.

Then the equilibrium concentrations of CO (g) and H2 (g) are equal to x. Hence, the equilibrium concentration of H2O (g) is (0.500 - x) M. Substitute these values in the expression for Kc and solve for x.

Kc = [CO (g)] [H2 (g)] / [H2O (g)] [C (s)]

= 0.2[CO (g)] = Kc [H2O (g)] [C (s)] / [H2 (g)]

= 0.2 × (0.500 - x) / x

We can simplify this expression by cross-multiplication to get:

5x = 0.1 - 0.2xx = 0.02 M

Substituting x = 0.02 M in the expression for [CO (g)], we get:

[CO (g)] = 0.2 × (0.500 - 0.02) / 0.02 = 5.8 M (approx.)

Therefore, the concentration of CO (g) in an equilibrium mixture (in mol/L) is 5.8 M.                                                                                               The problem requires us to find the equilibrium concentration of CO (g) in a mixture that initially contains only reactants.

To solve this problem, we need to use the expression for the equilibrium constant Kc, which is given by:

Kc = [CO (g)] [H2 (g)] / [H2O (g)] [C (s)]

We can also use the ICE table method to solve this problem. In this method, we start with the initial concentration of the reactants and calculate the change in concentration of each species as they reach equilibrium.

We then use the equilibrium concentrations to calculate the value of Kc and solve for the unknowns. Here is how we can set up the ICE table for this problem: Reaction:

C(s) + H2O(g) ⇄ CO(g) + H2(g)

Initial: [C] = [H2]

= 0 M,

[H2O] = 0.500 M

Equilibrium: [C] = [H2] = x,

[H2O] = 0.500 - x,

[CO] = [H2] = x

Change: +x +x -x -x

Substituting the equilibrium concentrations into the expression for Kc, we get:

Kc = [CO] [H2] / [H2O] [C]

= x² / (0.500 - x)

= 0.2

Solving for x, we get: x = 0.020 M

Substituting this value of x into the expression for [CO], we get:

[CO] = x = 0.020 M

Therefore, the concentration of CO (g) in the equilibrium mixture is 0.020 M.

In other words, only a small amount of CO (g) is produced in this reaction at 1000°C. T 0.020 M.

The concentration of CO in an equilibrium mixture (in mol/L) is 5.8 M.

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The following is a balanced reaction equation: 2CH4 + O2 > 2CH3OH

Let us first compute the delta H reaction using the conventional enthalpy of formation numbers.

Delta H rxn = sum of delta Hf product and delta Hf reactant

- [CH3OH *2] = [CH4*2]

= [-201.2 kJ/mol x 2] + [-74.87 kJ/mol * 2]

= -252.66 kJ

As a result, 2 mol CH4 produces -252.66 kJ of heat.

Let us now calculate the 38.8 g CH4

2.42 mol CH4 = 38.8 g CH4 * 1 mol / 16.04 g

-252.66 kJ = 2 mol CH4

2.42 mol = ? kJ

-306 kJ = 2.42kJ * (-252.66 kj) / 2 mol

As a result, the 38.8 g CH4 will produce 306 kJ (-306kJ) of heat.

Because of the exothermic reaction, a negative sign is assigned.

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Answer:

The answer would be A

Explanation:

A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).

The pair of substances that are most likely to form a homogeneous solution is B. H2O and CH3OH. A homogeneous mixture is one in which the components are evenly distributed throughout the mixture. These types of solutions have uniform properties and the same composition throughout.A heterogeneous mixture is one in which the components are not evenly distributed. This means that the mixture has distinct regions or phases that are visibly different from one another. The following are the most likely pairs of substances to form a homogeneous solution:A) F2 and C2H5OH (Heterogeneous mixture)B) H2O and CH3OH (Homogeneous mixture)C) LiCl and C10H20 (Heterogeneous mixture)D) CH4 and C2H5OH (Heterogeneous mixture).

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Answer:

number of neutrons = mass number - number of protons

Answer:

Yes,

Chemical Reactivity of metals decrease as you go left to right of the periodic table Chemical Reactivity increases as you go down the group....

Explanation:

Hope it Helps!!!

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We need 0.0161 liters of the 2.07 M sulfuric acid solution to make 57 milliliters of a 0.58 M solution of sulfuric acid.

We need to use the formula:

C1V1 = C2V2

Where

We want to find the volume of the 2.07 M sulfuric acid solution needed to make 57 milliliters of a 0.58 M solution. Let's plug in the values we know:

2.07 M * V1 = 0.58 M * 57 mL

Simplifying the equation, we get:

V1 = (0.58 M * 57 mL) / 2.07 M

V1 = 16.0874 mL

To convert the volume to liters, we divide by 1000:

V1 = 16.0874 mL / 1000 mL/L

V1 = 0.0161 L

Therefore, we need 0.0161 liters of the 2.07 M sulfuric acid solution to make 57 milliliters of a 0.58 M solution of sulfuric acid.

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The rate will increase by a factor of 8 if both NO and Cl₂ concentrations are doubled.

The reaction between Cl2 and NO is shown below:

2Cl₂ + 2NO --> 2ClNO + Cl₂

When the concentration of Cl₂ is doubled, the rate doubles. When the concentration of NO is doubled, the rate quadruples. If both Cl₂ and NO concentrations are doubled, the rate will increase by a factor of 8.

The rate of reaction is proportional to the frequency of collisions between particles. Therefore, increasing the concentration of reactants will increase the rate of reaction.The rate of a reaction can be expressed as the change in concentration of the reactant or product per unit time.

The rate of reaction can be affected by several factors, such as temperature, concentration, pressure, and the presence of a catalyst.

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Answer:

10076.55

Explanation:

The following is not a property of gases so the answer is "density of gases is much larger than those of solids or liquids" is not a property of gases.The correct answer is: "None of these answers." All of the statements listed in the question are properties of gases.

Gases are a state of matter that do not have a fixed shape or volume, and they expand to fill their containers completely. Gases have low densities compared to solids or liquids, which means that they are much lighter in weight. They are also highly compressible, meaning that their volume can be reduced by increasing the pressure exerted on them.

The density of gases can vary widely, depending on the temperature, pressure, and composition of the gas. For example, the density of helium gas is much lower than that of oxygen gas, due to the differences in their atomic masses. However, all gases are less dense than solids or liquids, and they all exhibit the same fundamental properties of gas behavior.

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Full Question:  Which of the following is not a property of gases?

Genetic engineering has helped farming primarily by creating crops that resist some diseases.

Through the use of genetic engineering, scientists have been able to modify the DNA of crops to make them more resistant to various diseases. This has led to increased crop yields, as fewer crops are lost to diseases, and reduced dependency on harmful chemical pesticides, which can have negative effects on the environment and human health.

Genetic engineering has significantly improved farming practices by developing disease-resistant crops, leading to higher crop yields and more sustainable agricultural methods.

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As the world becomes more environmentally conscious, it is critical that we consider the impact of our everyday activities, such as grocery shopping, on the environment. Grocery transportation choices play a critical role in the carbon footprint of grocery consumption.

Customers should choose transportation options that are both practical and ecologically friendly to ensure that their grocery shopping does not contribute to climate change. Several supermarkets now deliver groceries using electric vehicles, bicycle, or other sustainable modes of transportation. In addition, in some cities, shoppers may use electric cargo bicycles or even cargo bikes to transport groceries, avoiding the need for petrol-powered transportation.

When it comes to grocery transportation, every effort should be made to decrease the carbon impact. Customers should choose modes of transportation that are both practical and kind to the environment. This is not only good for the planet but also beneficial for our health and the health of future generations. Therefore, customers must adopt eco-friendly transport choices to keep the environment safe and healthy.

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Explanation:

the correct answer is the atmosphere, for it is the sphere of all gases surrounding the Earth