what is agriculture​

The change in color might indicating the formation of a new product. Hence, the color change indicates a chemical change.

A chemical change involves the breaking/ making or both of chemical bonds. Chemical changes results in formation of new products that have different properties and structure from the initial substances.

A physical change include change in size, shape, state etc. All phase changes such as melting, boiling, freezing are physical changes. Evolution or absorption of heat, conductivity, solubility etc are physical changes.

A change in color indicates that a new product with different color is formed in the system. Therefore, option c color change indicates a chemical change.

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Explanation:

Identify the substance: Determine the identity of the substance that is being measured in moles.

Determine the molar mass: Look up the molar mass of the substance in a periodic table or a reference book. The molar mass is expressed in grams per mole.

Set up the conversion factor: Use the molar mass to set up a conversion factor. The conversion factor is a ratio that relates the number of moles to the number of grams.

Example: If the molar mass of the substance is 50 g/mol, the conversion factor would be:

1 mol / 50 g

This means that one mole of the substance is equal to 50 grams.

Apply the conversion factor: Multiply the given quantity, expressed in moles, by the conversion factor. The moles unit will cancel out, leaving the unknown quantity in grams.

Example: If the given quantity is 2 moles of the substance, the calculation would be:

2 mol x (1 mol / 50 g) = 0.04 g

Therefore, the unknown quantity is 0.04 grams.

Check the units: Always double-check that the units of the final answer are correct. In this case, the units should be in grams

Answer:

100 m of KCL

Explanation:

This is because it is a more reactive metal and higher in the electro reactivity series which lead us to believe that it will take a longer time to heat along with the fact that it is lower in the periodic table and is a metal

Answer:

Your Answer would be Option B

Answer:

B

Explanation:

The Answer is B-Transfer of heat through direct physical contact

Explanation:

Using the formula ΔTb = Kb x molality, where ΔTb is the change in boiling point, we can solve for it and add it to the boiling point of pure water to find the boiling point of the KCl solution.

ΔTb = Kb x molality

ΔTb = 0.512 °C/m x 0.74 molal

ΔTb = 0.37968 °C

Boiling point of KCl solution = 100.00 °C + 0.37968 °C

Boiling point of KCl solution = 100.38 °C

Therefore, the boiling point of the KCl solution is 100.38 °C.

The volume concentration of clay exchange cations (Qv) in the sand is estimated to be 0.54 meq/cm³.

This value is calculated by multiplying the weight percent of montmorillonite clay (10 wt%) by the QCEC value (1.0 meq/g) and dividing it by the grain density (2.70 g/cc) and porosity (20%).

To calculate the volume concentration of clay exchange cations (Qv), we start by converting the weight percent of clay to meq/cm³. First, we convert the QCEC value from meq/g to meq/cc by dividing it by the grain density: 1.0 meq/g / 2.70 g/cc = 0.37 meq/cc.

Next, we multiply the weight percent of clay (10 wt%) by the QCEC value in meq/cc: 10 wt% * 0.37 meq/cc = 0.037 meq/cc.

Since the porosity is given as a percentage, we convert it to a decimal by dividing by 100: 20% / 100 = 0.20.

Finally, we divide the volume concentration of clay exchange cations by the porosity: 0.037 meq/cc / 0.20 = 0.185 meq/cc.

Therefore, the volume concentration of clay exchange cations (Qv) in the sand is estimated to be 0.185 meq/cc or 0.54 meq/cm³.

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To synthesize 2-methylpentan-3-one efficiently, following process has to be followed:

Start with the synthesis of 2-methylpentan-3-ol, which can be prepared via a Grignard reaction. Firstly, prepare 2-methylpentan-3-ol by reacting ethyl magnesium bromide with 3-methylbutanal.

Afterward, hydrolysis of this Grignard reagent using HCl or dilute sulfuric acid provides the alcohol.2-methylpentan-3-ol.

( Grignard reaction -The Grignard reaction is an organometallic chemical reaction in which carbon alkyl, allyl, vinyl, or aryl magnesium halides (Grignard reagent) are added to the carbonyl groups of either an aldehyde or ketone. This reaction is important for the formation of carbon–carbon bonds.)

Now,the oxidation of 2-methylpentan-3-ol is carried out using oxidizing agents like PCC (pyridinium chlorochromate), PDC (pyridinium dichromate), or Jones reagent to synthesize 2-methylpentan-3-one.Oxidation of 2-methylpentan-3-ol to synthesize 2-methylpentan-3-one can be represented as follows: PCC or PDC or Jones Reagent2-methylpentan-3-one.

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Answer:

tell me how you want

this done?

Explanation:

A photon has energy of 1.8 x 10⁻¹² Jules. The wavelength of this photon is 11.04 × 10⁻¹⁴ m.

Given that :

Energy of the photon : 1.8 × 10⁻¹² J

Energy of the photon is given by the formula :

E = h v

where,

E = energy of photon

h = Planck constant = 6.626 × 10⁻³⁴ J.s

v = frequency of photon

frequency of photon is given as :

v = c / λ

therefore ,

E = h c / λ

λ = h c /E

c = speed of light = 3 × 10⁸ m/s

λ = (6.626 × 10⁻³⁴ J.s  × 3 × 10⁸ m/s) /  1.8 × 10⁻¹² J

λ = 11.04 × 10⁻¹⁴ m

Thus, A photon has energy of 1.8 x 10⁻¹² Jules. The wavelength of this photon is 11.04 × 10⁻¹⁴ m.

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Answer: First, here is the balanced reaction:  2C4H10  +  13O2  ===>  8CO2  +  10H2O.

This says for every mole of butane burned 4 moles of CO2 are produced, in other words a 2:1 ratio.

Next, let's determine how many moles of butane are burned.  This is obtained by

5.50 g / 58.1 g/mole  =  0.0947 moles butane.  As CO2 is produced in a 2:1 ratio, the # moles of CO2 produced is 2 x 0.0947  =  0.1894 moles CO2.

Now we need to figure out the volume.  This depends on the temperature and pressure of the CO2 which is not given, so we will assume standard conditions:  273 K and 1 atmosphere.

We now use the ideal gas law PV = nRT, or V =nRT/P, where n is the # of moles of CO2, T the absolute temperature, R the gas constant (0.082 L-atm/mole degree), and P the pressure in atmospheres ( 1 atm).

V = 0.1894 x 0.082 x 273.0 / 1  =  4.24 Liters.

Explanation:

The element symbol for Gold is Au.

The Element Symbol for Gold is Au

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Based on the information provided, you should choose a 20 ml syringe for compounding the sterile order for chlorothiazide, as it will allow you to withdraw the exact calculated amount needed.

You should pick a 30 ml syringe to withdraw 20 ml of chlorothiazide. This will allow you to withdraw the medication with enough room in the syringe to prevent any spills or contamination. It is always important to choose a syringe size that is larger than the volume you need to withdraw to ensure accuracy and safety in compounding sterile orders.
Based on the information provided, you should choose a 20 ml syringe for compounding the sterile order for chlorothiazide, as it will allow you to withdraw the exact calculated amount needed.

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The number of carbon atoms present in 1.25 mol of silver acetate is 1.875 × 10²³.

Avogadro's number is define as the number of atoms of any substance present in one mole of that substance, and it is equal to 6.022 × 10²³, i.e.
1 mole = 6.022 × 10²³ atoms/mol

Given moles of silver acetate = 1.25 moles

Number of atoms of silver acetate in 1.25 moles = 1.25 × 6.022 × 10²³ = 7.5×10²³

Molecular formula of silver acetate is CH₃CO₂Ag, means in this molecule total 8 atoms are present so number of carbon atom will be calculated as:

Carbon atoms = (2× 7.5 × 10²³) / 8 = 1.875 × 10²³ atoms [here we multiply by 2 because 2 atoms of carbon is present in olecule]

Hence required atoms of carbon is 1.875 × 10²³.

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This will produce one AlCl3 molecule on the right-hand side. Thus, we get:r = 1

The correct option is option (d) 3, 1, 3, 2.

In the given balanced chemical equation:pBaCl2 + q A12 (SO4)3------AlCl3 + s BaSO4We need to find the values of p, q, r and s.To balance the equation:2AlCl3 + 3BaSO4 → BaCl2 + Al2(SO4)3Initially, there are p BaCl2 molecules, but this will produce p BaCl2 molecules on the right-hand side. Thus, we get:p = 1Similarly, there are q Al2(SO4)3 molecules, but this will produce q Al2(SO4)3 molecules on the left-hand side.

Thus, we get:q = 3Again, there are s BaSO4 molecules, but this will produce s BaSO4 molecules on the right-hand side. Thus, we get:s = 3Finally, there are no AlCl3 molecules on the left-hand side.

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Answer:

3500000 try this i think it's right not sure

Explanation:

Calories are used to define the unit of energy given by the consumed food in the body. A dinner containing 3.5x10⁶ joules has calories of 836.52 Cal.

Calories have been defined as the amount of energy given by the food and its various components, including carbohydrates, proteins, fats, fibers, etc. The stored calories more than the use of those calories results in their storage in the adipose tissues which may lead to obesity.

The food energy from joules can be converted into large calories (Cal) as it is the required amount to raise 1°C of the temperature of a 1 kg substance at 1 atm pressure.

The conversion is done as:

1 J = 0.000239 Cal

3500000 joules = 836.520 Cal

Therefore, the energy of dinner in calories is 836.520 Cal.

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A science communicator's relationship to the public is most similar to that of a translator or intermediary. The role of a science communicator is to bridge the gap between scientific language and jargon and the general public's understanding of scientific concepts and research.

It take complex ideas and make them accessible to a broader audience through various forms of media such as articles, videos, and presentations. Science communicators also strive to engage with the public, build trust and credibility, and facilitate conversations about science-related issues. In essence, they act as a conduit between the scientific community and the public, facilitating understanding and promoting scientific literacy.

Science communicators play an important role in promoting scientific literacy and critical thinking skills, which are essential in today's world where scientific issues and technologies are becoming increasingly relevant to our daily lives.

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Answer:

D

Explanation:

Please mark me as brainlyest

Producing hydrogen gas. Hence, option D is correct.

Electrolysis is described by two half-reactions. These half reaction are the oxidation half-reaction and reduction half-reaction.

Electrolysis involves the transfer of electrons. Each half reaction is characterized by the loss or gain of electrons.

The only reason why producing hydrogen gas is not used most of the time is because electrolysis has very low efficiency, most of the energy finishes up being converted to heat and 95% of the hydrogen is produced by steam reforming.

Hence, option D is correct.

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False. The distance between molecules decreases for all solids when they turn into liquids.

When a solid turns into a liquid, the distances between molecules generally decrease, rather than increase.

In a solid, molecules are typically arranged in a regular, ordered pattern and are closely packed together. As the solid is heated and melts, the molecules gain kinetic energy, causing them to vibrate and move more rapidly.

This increase in motion allows the molecules to break free of their ordered positions and slide past one another, resulting in a decrease in intermolecular distances and a transition from a solid to a liquid state.

There are some exceptions to this general trend, such as in cases where the solid structure is more porous and loosely packed than the liquid, but in most cases, the statement is false.

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Answer:

Al and Hcl

Explanation:

Reactants are the elements, compounds etc before the arrow

To prevent accidental vapor inhalation from volatile solvents, it is important to use Volatile solvents in a well-ventilated area with proper storage and disposal procedures for volatile solvents to prevent environmental contamination and fire hazards.

A volatile solvent is a liquid substance that has a high vapor pressure at room temperature. This means that the solvent evaporates quickly and easily, producing vapors that can be inhaled or ignite with a spark. Examples of volatile solvents include acetone, ethanol, and methanol.

To prevent accidental vapor inhalation from volatile solvents,

In conclusion, the inhalation of volatile solvents can pose health hazards such as respiratory irritation, intoxication, and central nervous system depression. To prevent accidental inhalation, it is important to use these solvents in a well-ventilated area, wear appropriate PPE and also follow proper storage and disposal procedures for volatile solvents.

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Answer:

B.sugar solution

Explanation:

A sugar solution is not a compound.

Rather, the solution is a mixture and an impure substance.

Answer:

16 neutrons.

Explanation:

From the question given above, the following data were obtained:

Mass number = 30

Atomic number = 14

Neutron number =?

Next, we shall determine the number of protons present in the isotope. This can be obtained as follow:

The atomic number of an element is simply defined as the number of protons present in the atom of the element. Thus,

Atomic number = Proton number

Atomic number = 14

Therefore,

Proton number = 14

Finally, we shall determine the number of neutons present in the isotope as follow:

Mass number = 30

Proton number = 14

Neutron number =?

Mass number = Proton + Neutron

30 = 14 + Neutron

Collect like terms

Neutron = 30 – 14

Neutron = 16

Therefore, the isotope contains 16 neutrons.

sunlight gives energy to living things

Explanation:

sun is the main energy for the earth

The mass of the given samples is 150.125 amu, 1,955,000 amu, 7.28336 * 10^22 amu, 24.31 amu, and 3.826206 amu respectively

The mass of the given samples can be calculated in the following way

To calculate the mass of a sample, you need to multiply the number of atoms in the sample by the atomic mass of the element. The atomic masses of the elements are given in the table inside the cover of the book.

a. 125 carbon atoms:

The atomic mass of carbon = 12.01 amu

Mass of sample = 12.01 amu/atom * 125 atoms = 150.125 amu

b. 5 million potassium atoms:

The atomic mass of potassium = 39.10 amu

Mass of sample = 39.10 amu/atom * 5,000,000 atoms = 1,955,000 amu

c. 1.04 × 10^22 lithium atoms:

The atomic mass of lithium = 6.94 amu

Mass of sample = 6.94 amu/atom * 1.04 * 10^22 atoms = 7.28336 * 10^22 amu

d. 1 atom of magnesium:

The atomic mass of magnesium = 24.31 amu

Mass of sample = 24.31 amu/atom * 1 atom = 24.31 amu

e. 3.011 × 10^23 iodine atoms:

The atomic mass of iodine = 126.90 amu

Mass of sample = 126.90 amu/atom * 3.011 * 10^23 atoms = 3.826206 amu

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According to the package insert, before reconstitution, varivax should be stored in the freezer. Based on this information, the suitable temperature range for varivax should in between -18 °C (0 °F) and -20 °C (-4 °F).

Based on the information provided, Varivax should be stored in the freezer. Typically, the temperature range for freezer storage is between -18 °C (0 °F) and -20 °C (-4 °F). Therefore, Varivax should be stored within this temperature range until it is ready for reconstitution. It is important to follow the specific storage instructions provided in the package insert to ensure the stability and efficacy of the product.

Hence, Varivax should be stored in the freezer with a temperature range in between -18 °C (0 °F) and -20 °C (-4 °F).

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Answer:

c. 800 K, 0.1 atm

Explanation:

Good luck in AP Chem

After 7.36 seconds,  1.5 mg of Kr-92 remains.

To calculate the remaining mass of Kr-92 after a certain time, we can use the concept of radioactive decay and the equation:

N(t) = N₀ * (1/2)^(t / T₁/₂)

Where:

N(t) is the remaining quantity at time t,

N₀ is the initial quantity,

t is the elapsed time,

T₁/₂ is the half-life of the radioactive substance.

Given:

Initial mass (N₀) = 24 mg

Half-life (T₁/₂) = 1.84 seconds

Elapsed time (t) = 7.36 seconds

Let's calculate the remaining mass of Kr-92 after 7.36 seconds:

N(t) = N₀ * (1/2)^(t / T₁/₂)

N(7.36) = 24 mg * (1/2)^(7.36 / 1.84)

N(7.36) = 24 mg * (1/2)^4

N(7.36) = 24 mg * 1/16

N(7.36) = 1.5 mg

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