The earth is closest from the sun in___

Answer:

the answer would be b

Explanation:

the body sytsem needs to depend on eah other in order to work

Body systems are like runners in a marathon, who each run alone and don't need the other runners to finish the race, is not a good way to describe a body system, hence option B is correct.

Your digestive tract takes nutrients and water from the food you eat in to your body. The body's cells receive oxygen, water, and nutrients through your circulatory system.

Your skin, excretory system, and respiratory system all function to remove wastes from your cells.

Your body's many systems depend on one another to function properly. While your heart's muscles require oxygen from your lungs to beat, your respiratory system depends on your circulatory system to distribute the oxygen it collects.

Therefore, option B is correct.

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Dopamine is a neurotransmitter in the brain involved in various physiological functions, including movement, reward, motivation, and pleasure.

As a researcher working with the novel molecule, your goal would be to investigate whether it exhibits agonistic activity towards dopamine receptors. This involves studying its ability to bind to dopamine receptors and initiate the associated signaling pathways. To determine if the molecule is a dopamine agonist, you would typically conduct experiments using in vitro and/or in vivo models. In vitro experiments involve working with isolated components, such as cell cultures or purified receptor proteins, while in vivo experiments involve studying the molecule's effects in whole organisms.

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Answer:

\(\large \boxed{\text{-92 $^{\circ}$C}}\)

Explanation:

We can use the Ideal Gas Law and solve for T.

pV = nRT

Data  

p = 1.25 atm

V = 25.0 L

n = 2.10 mol

R = 0.082 06 L·atm·K⁻¹mol⁻¹

Calculations

1. Temperature in kelvins

\(\begin{array} {rcl}pV & = & nRT\\\text{1.25 atm} \times \text{25.0 L} & = & \rm\text{2.10 mol} \times 0.08206 \text{ L}\cdot\text{atm}\cdot\text{K}^{-1}\text{mol}^{-1} \times T\\31.25&=&0.09847T\text{ K}^{-1}\\T& = &\dfrac{31.25}{\text{0.098 47 K}^{-1}}\\\\& = &\text{181 K}\end{array}\)

2. Temperature in degrees Celsius

\(\begin{array} {rcl}T & = & (181 - 273.15) \, ^{\circ}\text{C}\\& = & -92 \, ^{\circ}\text{C}\\\end{array}\\\text{The temperature of the gas is $\large \boxed{\mathbf{-92 \, ^{\circ}}\textbf{C}}$}\)

Answer:

The Bohr atomic model did not make correct predictions of large- sized atoms and provided sufficient information only for smaller atoms.

Answer:

3

Explanation:

We have to cancel out the electrons so multipy ionic reaction of Ag by 3 and add it to ionic reaction of Al.

Answer:

27.50 g

Explanation:

Unless weight was somehow gained/lost during the reaction, the products should weigh as much as the reactants. Since this isn't specified the mass of the reactants should be equal to the mass of the products.

Answer:

Explanation:

Omg so exited!

Fog remains suspended in the air because they are supported by slight movement in the air

If the air near the ground cools down enough and is humid and light wind (stable), water vapour in the air may condense into minute water droplets. Near ground level, these raindrops make it harder to see. Fog is the term for the phenomenon.

Fog is defined as "air that is near to the surface and contains suspended water droplets, typically generated by diabatic cooling" in Understanding Weather and Climate.

When the air close to the ground cools down sufficiently, the water vapor condenses into liquid water or ice, creating fog. Fog comes in a wide variety of forms. When the air close to the ground is chilly enough, ice fog develops.

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When nitrate solution of metal X reacts with sodium chloride then white precipitate is formed then metal X is Ag

AgNO 3​ +NaCl→AgCl↓(whiteppt)+NaNO 3​Aqueous nitrate solution of metal X react with Hypo-phosphorous acid to produce  

Z3​ PO 4​ ​ .4AgNO 3​+H 3​ PO 2​ +2H 2​ O→ ZH 3 PO 4​  +4Ag+4HNO 3

​Lead (II) nitrate solutions that have sodium chloride added will produce a white precipitate of (relatively) insoluble lead chloride. for chlorophyll. Together, opposites are pulled. Harmful energy is drawn to positive energy. When Pb(NO3)2(aq) and NaCl(aq) are combined, PbCl2(s) and NaNO3 precipitate (aq). Give an explanation for why there is no response when solid sodium chloride and solid lead nitrate come into contact. If both substances are solids, nothing will happen; they will merely combine and have no effect. Lead (II) and nitrate establish ionic connections with one another since they don't contain reactive ions in their solid state.

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Answer:

  1.7700×10^-22 g

Explanation:

A face-centered-cubic cell contains 4 atoms, so the volume per atom is ...

  (389.80×10^-12 m)³/(4 atoms) ≈ 1.4725×10^-29 m³

Then the mass of 1 atom is ...

  (12020 kg/m³)(1.4725×10^-29 m³) ≈ 1.76995×10^-25 kg

  ≈ 1.7700×10^-22 g

_____

Additional comment

That is the approximate mass of a Palladium atom.

Answer:

1.7700×10^-22 g

Explanation:

To properly test for total chlorine in water, it is important to collect the correct amount of water. The recommended amount of water to collect for total chlorine testing is at least 100 mL.

This amount of water ensures that the test results are accurate and representative of the overall chlorine content in the water sample.

It is also important to ensure that the water sample is collected in a clean and sterile container to avoid any contamination that may affect the test results.

It is recommended to collect the water sample from the middle of the water source, and to avoid collecting water that may have been stagnant for an extended period of time.

Proper collection and testing of water for total chlorine is crucial in ensuring the safety and quality of drinking water.

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Answer:

Compounds have a homogenous composition of atoms even thou they are different atoms . they are always joined in the same ratio and cannot be separated by physical methods. May lose their property as they undergo chemical changes generally.

Whereas mixture are formed by uneven ratio of atoms and these are made and separated by physical processes .No new substances are formed in mixtures .The constituents of a mixture do not lose their properties

Explanation:

Answer:

28g/mol

2 moles of nitrogen are present

Explanation:

The molar mass is defined as the mass of a chemical when 1 mole of this substance is present and is used to convert mass of the substance to moles or vice versa. Is widely used in stoichiometry problems.

1 atom of nitrogen has a molar mass of 14g/mol. N₂(g) -The molecule that contains 2 atoms of nitrogen- has a molar mass of 28g. That is 28g/mol.

56g of N₂ are:

56g * (1mol / 28g) =

La(OH)3 precipitates at a pH of approximately 7.21 in this acidic solution when treated with NaOH.

To determine the pH at which La(OH)3 precipitates in an acidic solution containing 0.017 M La3+ treated with NaOH, we can follow these steps:

1. Write the balanced chemical equation for the reaction:
La3+ + 3OH- → La(OH)3 (s)

2. Write the solubility product (Ksp) expression for La(OH)3:
Ksp = [La3+][OH-]^3
Given that Ksp for La(OH)3 is 2×10^-21.

3. Calculate the concentration of OH- ions needed to precipitate La(OH)3:
[OH-] = (Ksp / [La3+])^(1/3)
[OH-] = (2×10^-21 / 0.017)^(1/3)
[OH-] ≈ 1.62×10^-7 M

4. Determine the pOH:
pOH = -log([OH-])
pOH = -log(1.62×10^-7) = -(log 1.62 +(-7*log10)) = -(0.209 +(-7*1)) = -(0.209-7) = -(-6.791) = 6.791
pOH ≈ 6.79

5. Calculate the pH:
pH = 14 - pOH
pH ≈ 14 - 6.79
pH ≈ 7.21

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The phasor transform of the current source is 300∠60∘ mA.

The phasor transform of a current source described as i(t)=300sin(500t 60∘) ma can be found using the following steps:

1. Identify the amplitude and frequency of the current source. The amplitude is 300 mA and the frequency is 500 Hz.

2. Convert the sinusoidal function to a phasor form using Euler's formula:

e^(jθ) = cosθ + j sinθ

3. Substitute the values of amplitude and frequency into the phasor form:

i(t) = 300e^(j(500t + 60∘))

4. Simplify the expression by using the properties of exponential functions:

i(t) = 300e^(j500t)e^(j60∘)

5. Express the phasor transform in polar form by identifying the magnitude and phase angle:

Magnitude = 300 mA

Phase angle = 60∘

6. Write the phasor transform as a complex number in polar form: i(t) = 300∠60∘ mA

Therefore, the phasor transform of the current source is 300∠60∘ mA.

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The physical process that is primarily responsible for the purification achieved during recrystallization is the process of selective solubility.

The process of selective solubility refers to the ability of a substance to selectively dissolve in a particular solvent or a combination of solvents. The substance that is more soluble in a solvent will dissolve in that solvent while the impurities that are less soluble will remain undissolved.

The process of recrystallization is used to purify a solid that contains impurities. In this process, a solid is dissolved in a solvent that is heated to the boiling point. Once the solution is saturated, it is cooled slowly, and crystals are allowed to form. During recrystallization, the impurities are excluded from the growing crystals because of their lower solubility in the solvent, and the crystals that form are pure.

Therefore, the process of selective solubility is primarily responsible for the purification achieved during recrystallization.

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Answer:$$7.50 x 10^23$$

$$H_2SO_4$$?

Explanation:It is a fact that such a quantity has a mass of  

98.08

⋅

g

. Why? Because  

6.022

×

10

23

particles SPECIFIES a molar quantity. And we know (or can calculate) that sulfuric acid has a molar mass of  

98.08

⋅

g

...  

Answer:

balanced equation:

2Ca(NO3)2 (aq)-----> 2CaO (s) + 4NO2 (g) + O2 (g)

So heating 2 moles of Ca(NO3)2 gives 2 moles of CaO, 4 moles of NO2 and 1 mole of O2. This is a heat decomposition reaction. It gives a white precipitate (CaO), and brown pungent gas (NO2).

Answer:

The balanced equation of the reaction is below.

Explanation:

2Ca(NO3)2 -----> 2CaO + 4NO2 + O2.

Answer:

Explanation:

sunlight

soil

water

sugar

carbon dioxide

minerals

leaves

vitamins

Answer:

a) club soda is a compound

b) Club soda is a manufactured form of carbonated water, commonly used as a drink mixer. Sodium bicarbonate, potassium sulfate, potassium bicarbonate, potassium citrate, or sodium citrate is artificially added to replicate constituents commonly found in natural mineral waters

A: Negatively charged ions

B: Hydrophollic molecules

Facilitated diffusion is the spontaneous passive transport of molecules across the biological membrane through the help of a membrane protein. This type of diffusion occurs in the molecules that cannot cross the membrane freely and requires a molecule to enter and leave the membrane.

Negatively charged ions and hydrophobic molecules require facilitated diffusion.

Therefore, option A and B are correct.

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Answer:

It is broken down into water and oxygen

Explanation:

2H2O2 -----> 2H2O +O2

The compound expected to show intense IR absorption at 2250 \(cm^{-1}\) is \((CH_3)_2CHCN\). This is because the compound has characteristic of the nitrile functional group, -C≡N.

IR absorption is a technique used to identify the functional groups in a compound by measuring the wavelengths at which the compound absorbs infrared radiation. Different functional groups have characteristic IR absorption frequencies, which can be used to identify them. The IR absorption frequency of 2250 \(cm^{-1}\) is characteristic of the nitrile functional group, -C≡N. Therefore, the compound that would be expected to show intense IR absorption at this frequency is the one that contains the nitrile functional group, which is \((CH_3)_2CHCN\). The other compounds, \(CH_3CH_2CH_2COOH, (CH_3)_2CHCH_2OH\), and \(CH_3CH_2CH_2CONH_2\), do not contain the nitrile functional group, so they would not be expected to show intense IR absorption at 2250 \(cm^{-1}\).

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Answer:

Hess’s Law describes how the __Heat__ energy of a reaction consists of the _Enthalpy__ of the energy changes of the individual step reactions

Explanation:

Hess law is a legendary law which is given by

\(\\ \rm\Rrightarrow ∆H_{net}=\sum \delta H_r\)

The balanced nuclear equation for the synthesis of 289 Uup (element 115) is as follows:
243 Am + 48 Ca → 289 Uup + 4 n
This reaction involves firing a beam of 48 Ca ions at 243 Am. The collision of the two nuclei results in the creation of a superheavy element, 289 Uup. In the process, two neutrons are also ejected. The reaction is balanced with the lowest possible coefficients, indicating that for every one 243 Am and 48 Ca that react, one 289 Uup and four neutrons are produced. The synthesis of superheavy elements through nuclear reactions such as this one is an area of ongoing research in nuclear physics.

To write a balanced nuclear equation for the synthesis of the superheavy element 289Uup (element 115) using the given terms, we can follow these steps:
1. Identify the initial reactants: 48Ca ions and 243Am.
2. Recognize that two neutrons are ejected during the reaction.
3. Determine the resulting product, which is 289Uup.
The balanced nuclear equation can be written as:
48Ca + 243Am -> 289Uup + 2n
This equation indicates that when a beam of 48Ca ions is fired at 243Am, it results in the synthesis of the superheavy element 289Uup, along with the ejection of two neutrons.

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Answer:

1. a series of steps 2. experiment

Explanation:

Explanation:

acid ,HNO3

base,KOH

salt ,KNO3

No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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Answer:

Na^+

Explanation:

The symbol for sodium is Na.  The term "sodium ion" assumes that the reader knows that sodium's single 3s electron is susceptible to theft by any nearby element that has a high electron affinity.  Sodium's ionization energy is low, allowing the 3s electron to move elsewhere and leave behinf a positively charged Na^+ atom.

Explanation:

6 CO2 + 12 H2O ---->C6H12O6 + 6 O2+ 6 H2O