A scientist studying the Milky Way galaxy notices a bright light in the sky. What information would she need to prove that the object is a comet and not a star?



Does the object move?

Is there gas in the object?

How big is the object?

Are there other objects orbiting it?


a I and II

b I and IV

c I, II, and IV

d I, II, and III

The boiling point of the solution was estimated to be 100.167 °C.

To calculate the boiling point of the solution:

ΔTb = Kb × m

where ΔTb = change in boiling point, Kb = boiling point elevation constant for water (0.512 °C/m), and m = molality of the solution.

Calculate the molality of the solution:

molality (m) = moles of solute / mass of solvent (in kg)

mass of solvent = 2750 g / 1000 = 2.75 kg (conversion to kg)

moles of solute (K3PO4) = 0.900 moles

m = 0.900 / 2.75 = 0.327 mol/kg

Solve for boiling point elevation:

ΔTb = Kb × m = 0.512 °C/m × 0.327 mol/kg = 0.167 °C

Determine boiling point of the solution:

boiling point of solution = boiling point of pure solvent + ΔTb

The boiling point of pure water is 100 °C, so:

boiling point of solution = 100 °C + 0.167 °C = 100.167 °C

Therefore, the boiling point of the solution is 100.167 °C.

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Answer:

A significant quantity of natural benzaldehyde is produced from cinnamaldehyde obtained from cassia oil by the retro-aldol reaction: the cinnamaldehyde is heated in an aqueous/alcoholic solution between 90 °C and 150 °C with a base (most commonly sodium carbonate or bicarbonate) for 5 to 80 hours, followed by ...

Explanation:

Answer:

52.165 inches

Explanation:

hope it help

Answer:

52.2 inches

Explanation:

Answer:

Explanation:

Here, we want to select what is contained in pure water with a pH of 7

Pure water with a pH of 7 simply contains equal concentration of hydroxide and oxonium ion (hydrogen ion)

Thus, in this case,the correct choice of answer would be B

Answer:

The shorter a wave length, the high its energy.       C

Explanation:

They are all related by one important equation: Any electromagnetic wave's frequency multiplied by its wavelength equals the speed of light. FREQUENCY OF OSCILLATION x WAVELENGTH = SPEED OF LIGHT We can use this relationship to figure out the wavelength or frequency of any electromagnetic wave if we have the other measurement.

Hope it helps!

1. The percentage composition of iron in the compound is 34.4%

2. The percentage composition of chlorine in the compound is 65.6%

3. The empirical formula of the compound is FeCl₃

Percentage of Fe = (mass of Fe / mass of compound) × 100

Percentage of Fe = (143 / 416) × 100

Percentage of Fe = 34.4%

Percentage of Cl = 100 – 34.4

Percentage of Cl = 65.6%

Divide by their molar mass

Fe = 34.4 / 56 = 0.614

Cl = 65.6 / 35.5 = 1.848

Divide by the smallest

Fe = 0.614 / 0.614 = 1

Cl = 1.848 / 0.614 = 3

Thus, the empirical formula of the compound is FeCl₃

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At the onset of puberty, the pituitary gland in the brain starts secreting high pulses of hormones called gonadotropins.

The pituitary gland is a small, bean-shaped gland located at the base of the brain, in a small depression of the skull called the sella turcica. It is often referred to as the "master gland" because it controls and regulates the functions of several other glands in the body. The pituitary gland is divided into two main parts: the anterior pituitary and the posterior pituitary.

The pituitary gland produces and releases several hormones, including growth hormone, thyroid-stimulating hormone, adrenocorticotropic hormone, follicle-stimulating hormone, luteinizing hormone, prolactin, and oxytocin. These hormones play critical roles in regulating growth and development, metabolism, reproduction, and the body's response to stress.

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Answer:

The new pressure becomes one third of the initial pressure.

Explanation:

The relation between pressure and volume at constant temperature is given by :

\(P\propto \dfrac{1}{V}\\\\P=\dfrac{1}{V}\)

Let new pressure and volume be P' and V' respectively.

V'=3V (given)

So,

\(P'=\dfrac{1}{V'}\\\\=\dfrac{1}{3V}\\\\=\dfrac{1}{3}\times \dfrac{1}{V}\\\\P'=\dfrac{1}{3}\times P\)

Hence, new pressure becomes one third of the initial pressure.

i cant understand your question define briefly

Substance C is a solid solute because the solubility of a solid increases with increasing temperature. Therefore, option B is correct.

Solubility refers to the ability of a solute to dissolve in a solvent and form a homogeneous mixture called a solution. It is a measure of how much of a solute can dissolve in a given amount of solvent under specific conditions, such as temperature and pressure.

Solubility is typically expressed as the maximum amount of solute that can dissolve in a specified amount of solvent. The solubility of a substance is influenced by various factors, including the nature of the solute and solvent, temperature, pressure, and the presence of other substances.

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Answer: it's substance A hope it helps.!

Answer:

Two moles.

Explanation:

Sulphuric (sulfuric) acid \(\rm H_2SO_4\) is a diprotic acid. When one mole of \(\rm H_2SO_4\) molecules dissolve in water, two moles of \(\rm H^{+}\) ions would be produced.

\(\rm H_2SO_4 \to 2\, H^{+} + {SO_4}^{2-}\).

On the other hand, sodium hydroxide \(\rm NaOH\) is a monoprotic base. When one mole of \(\rm NaOH\) formula units dissolve in water, only one mole of hydroxide ions \(\rm OH^{-}\) would be produced.

\(\rm NaOH \to Na^{+} + OH^{-}\).

Note that \(\rm H^{+}\) and \(\rm OH^{-}\) react at a one-to-one ratio:

\(\rm H^{+} + OH^{-} \to H_2O\).

As a result, it would take \(2\; \rm mol\) of \(\rm OH^{-}\) to react with the \(\rm 2\; mol\) of \(\rm H^{+}\) that was released when \(1\; \rm mol\) of \(\rm H_2SO_4\) is dissolved in water. Since one mole of \(\rm NaOH\) formula units could produce only one mole of \(\rm OH^{-}\), it would take \(\rm 2\; mol\) of \(\rm NaOH\) formula units to produce that \(2\; \rm mol\) of \(\rm OH^{-}\) for reacting with \(1\; \rm mol\) of \(\rm H_2SO_4\).

We do not have enough information to deduce the isotope that would have nine neutrons. Option 5

The atom is composed of subatomic particles. The subatomic particles that are in the atom are such that we have the electrons that are negatively charged, the protons that are positively charged and the neutrons that are uncharged.

Now, we know that the number of neutrons is obtained as the difference between the mass number and the atomic number of the atom. In this case, we only have the mass numbers and not the atomic numbers thus we do not have sufficient information.

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Answer:

if you meant 3.82* 10^24, the answer is 6.34551495 moles

if you meant 3.28*1024, the answer is 6.49780731*10^-21 moles

since you're going from molecules to moles, you need to divide by Avogadro's number which is 6.02*10^23

Answer:

poor access to health care providers

Explanation:

without health care providers you cant get tested.

Answer:

4th phrase

substances in equal amounts in the body

Answer:

D

Explanation: (:

Answer:

D. Many, many years of deposition

Explanation:

The layers of the rocks in one region of the parks are smooth and distinct, which are evidence of many, many years of deposition.

The layers on the rocks are because of different deposition of sediments. Different sediments deposited over the rocks through wind, water and ice over the ages.

Hence, the correct answer is D.

Answer:

d

Explanation:

a pex

Answer:

complementary colour

Explanation:

The complementary colors are used for the light that is transmitted when complex ions absorb wavelength of visible light.

Complementary colors are color pairs that cancel each other whenever combined and mixed, resulting in a grayscale color either white or black. They offer the most contrast for the those two hues when put adjacent to each other. Colors that are complementary are sometimes known as "opposite colors."

Light, often known as visible light, is electromagnetic radiation that falls within the region of the electromagnetic spectrum which the human eye can perceive.

Therefore,  the complementary colors are used for the light that is transmitted when complex ions absorb wavelength of visible light.

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Answer:

I think option B is the correct answer.

I think it will help you.

Answer:

OB. The government provides soil and freshwater resources to all American citizens

Explanation:

have a great day ahead" :)

Answer:

Yes

Explanation:

The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time. It is an intrinsic expansion whereby the scale of space itself changes. The universe does not expand "into" anything and does not require space to exist "outside" it.

Answer:

56.52 units

Explanation:

hope that helps :)

Answer:

the sour food changed

Explanation:

because the molecules were able to move fast enough to overcome the attraction between them, it's molecules now move in place

Formula

\(\ell=\frac{n h}{2 \pi}\)

\(\ell = angular \: momentum\)

\(n = principal quantum number \\ h = Planck's constant \\ \pi = pi\)

The section many chemical and pysical changes are Happening In nature relate to section "matter Isn't lost In photosynthesis" by the fact that,It provides another example of how matter is conserved within ecosystems.

Similar to the law of conservation of energy, the total mass of a system is conserved. Mass can neither be created nor be destroyed. However, the mass of a system can be transferred to another system or can be converted as heat energy.

Photosynthesis is the process of synthesizing chemical energy in green plants using light energy. The reaction involves the combination of carbon dioxide and water to form glucose and oxygen gas.

In this reaction, the total mass of the reactants is exactly equal to the total mass of the products. Hence, the mass is conserved. This is the case for all balanced chemical reactions and physical changes. Hence, option A is correct.

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Answer:

read below ( sorry if this doesn't help :/ )

Explanation:

Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. The chemical symbol for Cadmium is Cd.

Answer:

No. of proton: 48

No. of neutron:64

No. of electrons: 48

The key IR stretch for the aromatic substitution pattern of 5-iodosalicylamide is 770-715 cm-1; monosubstituted.

Monosubstituted is a term used to describe a molecule or compound in which a single atom or group of atoms has been replaced by another atom or group of atoms. This type of substitution is a common reaction in organic chemistry and is used to modify the properties of the molecule or compound. Monosubstitution can be used to change the reactivity, solubility, melting point, boiling point, and other physical and chemical properties of the molecule or compound. Monosubstitution is also used to create new compounds with desired properties, such as drugs, dyes, and other materials. Monosubstituted compounds are often more stable than their parent compounds and can be used in a variety of applications.

This stretch corresponds to the C-I bond stretching vibration in the monosubstituted aromatic ring, which is the primary motif of 5-iodosalicylamide.

Therefore the correct option is B.

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The number of moles of lead hydroxide formed is 0.00304 moles. So the mass of lead hydroxide formed will be 0.733g

The balanced reaction between lead nitrate with sodium hydroxide is as follows.

Pb(NO₃)₂ + 2NaOH ⇒ Pb(OH)₂ + 2NaNO₃

So one mole of lead nitrate reacts with 2 moles of sodium hydroxide to give one mole of lead hydroxide and two moles of sodium nitrate. Since sodium hydroxide is in excess, lead nitrate is the limiting agent.

Here it is given that molarity of solution is 0.135 M.

Molarity = Number of moles/ Volume of solution in litres

0.135 = number of moles/ 0.0225 L

Number of moles = 0.135× 0.0225

                              = 0.00304 moles

So from 0.00304 moles of lead nitrate 0.00304 moles of lead hydroxide is formed.

Molar mass of lead hydroxide = 241.21 g

Mass = Molar mass × number of moles

      =241.21 × 0.00304

      = 0. 733 g

So 0.733g of lead hydroxide is produced.

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Cloning is used for to create duplicate of other cell or organism. Because there are legal and ethical restrictions regarding human cloning. So, option D is correct.

The process in which replication occurs to produce another cell, tissue or organism is called as cloning. It increase the disease resistance and yield.

Banana cloning allows them to be a crop provides high yields, with or without pollination and seed formation. But before domestication, most banana varieties produces large number of seeds in the middle of the fruit.

Scientists clone banana plants it gives genetic modification for the lack of traditional breeding opportunities. It is an effective way to develop bananas yield.

Hence, option D is correct.

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Answer:

Scientist are born the most likely people to become scientist have naturally accelerated thought process from a young age