a plane flying at 250 mph for 5 hours. how far did the plane fly?

will give brainliest

Answer:

13.5 g of chromium (II) chloride (CrCl2).

Explanation:

What is given?

Molality (m) = 0.294 m.

Mass of solvent = 375 g = 0.375 kg.

Molar mass of chromium (II) chloride (CrCl2) = 122.8 g/mol.

Step-by-step solution:

Let's remember the concept of molality: The molality (m) of a solution is the moles of solute divided by the kilograms of solvent. Its formula is the following:

As we have the molality, and the mass of solvent in kg, we just have to solve for 'moles of solute', which in this case, the solute is CrCl2, and replace the given data, like this:

We have 0.110 moles of CrCl2, but the problem is asking for its mass, so let's convert 0.110 moles to grams using the molar mass of CrCl2:

The answer is that we need to add 13.5 g of chromium (II) chloride (CrCl2).

25 gigaseconds is equal to 2,500,000,000,000 centiseconds

0.67 moles of glucose are dissolved in 250 mL of a 2.67 M solution.

Thus, The name "glucose" is derived from the Greek word for "sweet." Your body uses this particular sort of sugar, which it obtains from the food you consume, as fuel.

It is referred to as blood glucose or blood sugar when it passes through your bloodstream to reach your cells. The hormone insulin transports glucose from the blood into the cells for use as fuel and storage. Blood glucose levels are higher in diabetics than in healthy people.

Either their cells don't react to insulin as insulin should or they don't have enough insulin to get it through. Long-term high blood glucose levels can harm your kidneys, eyes, and other organs.

Thus, 0.67 moles of glucose are dissolved in 250 mL of a 2.67 M solution.

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Answer: 18

Explanation:

i think  so

The ability of an atom to draw in the shared pair of electrons is measured by its electronegativity. For calculating electronegativity, people frequently utilize the Pauling scale.

When an electron is added to a neutral atom in a gaseous state to create a negative ion, the energy of the atom changes (in units of kJ/mole). In essence, it conveys the atom's propensity to pick up an electron.

In the modern periodic table's 17th group, fluorine is located above chlorine. Despite having seven electrons in its valence shell, it is smaller than an atom of chlorine.

The electron density rises as a result. Fluorine has a higher electronegativity because of its high electron density, which can draw in a shared pair of electrons.

Therefore, The ability of an atom to draw in the shared pair of electrons is measured by its electronegativity. For calculating electronegativity, people frequently utilize the Pauling scale.

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Combustion reactions require oxygen, a fuel, and give off energy.

Combustion reactions, also known as burning, are chemical reactions that occur when a fuel combines with oxygen in the presence of an ignition source. The main answer to the question is that combustion reactions require all of the mentioned components: oxygen, a fuel, and they give off energy.

Oxygen is a crucial component in combustion reactions because it acts as an oxidizer. It combines with the fuel, which can be any combustible material such as wood, gasoline, or natural gas. The presence of oxygen enables the fuel to undergo oxidation, releasing energy in the form of heat and light.

Without a fuel source, combustion cannot occur. The fuel provides the carbon and hydrogen atoms necessary for the reaction. Different fuels have varying energy content and combustion characteristics, which can affect the intensity and efficiency of the reaction.

When a fuel and oxygen react, a chemical reaction takes place, resulting in the release of energy. This energy is in the form of heat and light, which is why combustion reactions often produce flames. The energy released during combustion can be harnessed for various purposes, such as heating, cooking, or powering engines.

In summary, combustion reactions normally require oxygen as an oxidizer, a fuel source to provide the necessary atoms, and they give off energy in the form of heat and light. These reactions are essential for various practical applications and play a vital role in our daily lives.

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After 62 hours, approximately 23.4375 grams of the 750 gram sample of K-42 is left.

To calculate the amount of K-42 remaining after 62 hours, we need to determine the number of half-lives that have passed and then calculate the remaining amount using the formula:

Remaining amount = Initial amount × (1/2)^(number of half-lives)

Given that the half-life of K-42 is 12.4 hours, we can divide the total time (62 hours) by the half-life to find the number of half-lives:

Number of half-lives = 62 hours / 12.4 hours = 5

Now, we can calculate the remaining amount:

Remaining amount = 750 g × (1/2)^5 = 750 g × (1/32) = 23.4375 g

Therefore, approximately 23.4375 grams of the 750 g sample of K-42 will be left after 62 hours.

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Answer:

C) 0.121 M

Explanation:

HCl + H₂O = H₃O⁺ + OH⁻

.121M              .121M

HCl is a strong acid . It will dissociate almost 100 % so the concentration of acid and hydronium ion formed will be equal . It is to be noted that hydronium ion is formed due to association of H⁺ and H₂O . H⁺ is formed due to ionisation of HCl .

So concentrtion of hydronium ion ( H₃O⁺ ) will be .121 M.

2.69 × \(10^2^3\) atoms are in 10.0 L of Xe gas at STP . The correct option is A) 2.69 x \(10^2^3\) atoms .

At STP (standard temperature and pressure), 1 mole of any gas occupies 22.4 L. To find the moles of xenon in 10.0 L, we can use the formula:

moles = volume (L) / molar volume (L/mol)

moles = 10.0 L / 22.4 L/mol ≈ 0.446 moles

Now, to find the number of xenon atoms, we multiply the moles by Avogadro's number (6.022 x  \(10^2^3\) atoms/mol):

atoms = moles × Avogadro's number

atoms = 0.446 moles × 6.022 x \(10^2^3\) atoms/mol ≈ 2.69 x \(10^2^3\) atoms

So, the correct answer is A) 2.69 x \(10^2^3\) atoms.

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Answer:

1: because phosphate contain oxide ions so that is base character

The process of adding a solid to a  liquid to make a mixture is called Dispersion. The mixture can be a solution or a suspension.

For the mixture to be totally in a state of equilibrium, the mixture has to be a solution, which means that the solid particles have fully dissolved in the liquid, otherwise known as a solvent.

Dispersions could result in different mixtures which are named according to how they appear. An example is a suspension, which appears to be partly dissolved in the liquid to form a semi-solid mixture.

Dispersions could also result in emulsions and colloids, all of which have large particles and are non-crystalline in nature.

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Answer:

Explanation:

The positively charged center in an atom is called as Nucleus. It is made up of positively charged protons and neutral sub-atomic particle called as neutrons.

What is meant by protons ?

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Answer:

The correct answer is A and D.

Explanation:

Please I want brainliest.

Reason:

The size of the ions follows the order:

Negatively charged ion > Neutral atom >

Positively charged ion

This is because of the size of ions increases when the electrons are added to the outermost shell of an atom.

This happens due to the increase in

electron-electron repulsion.

Moreover, when the electrons are removed from an atom, then the affective nuclear charge that is experienced by the outermost electron increases.

Thus the size of the positively charged ion is least.

The answer is 3. No, because this fragment does not contain the bromine atom.

In mass spectrometry, fragmentation occurs when a molecule is bombarded with high-energy electrons, causing it to break apart into smaller fragments. The fragment appearing at m-15 indicates the loss of a methyl group (CH3) from the molecular ion. Since the fragment does not contain the bromine atom, it would not contribute to a signal at m-13, which would correspond to the loss of a hydrogen atom (H) from the molecular ion. Therefore, we would not expect a signal at m-13 that is equal in height to the m-15 peak.

In mass spectrometry, the molecular ion peak (M+) corresponds to the intact molecular ion with the highest mass-to-charge ratio (m/z). Fragments are generated through the cleavage of chemical bonds within the molecule. The m/z value of a fragment peak corresponds to the mass of the fragment divided by its charge. In this case, the molecular ion peak at m/z = 150 suggests a molecule with a mass of 150 atomic mass units (amu) and a single positive charge. The presence of a fragment peak at m-15 indicates the loss of a methyl group (CH3) from the molecular ion. However, the fragment at m-15 does not contain the bromine atom since the bromine atom is still attached to the main carbon chain. Therefore, a signal at m-13, which would correspond to the loss of a hydrogen atom (H) from the molecular ion, would not be expected to be equal in height to the m-15 peak because it does not contain the bromine atom.

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The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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Answer:

7500000cm/hr

Explanation:

6km=600000cm

24min=24/60hr=0.4hr

so, according to the question

6k/24km=600000cm÷0.4hr

=1500000cm/hr

therefore in 5 hours we can run:

5×1500000cm/Hr

=7500000cm/hr

A person can run "7,500,000 cm" in 5 hours.

According to the question,

A person can run 6 km in 24 minutes, i.e.,

= \(\frac{6}{24} \ km/min\)

and,

5 hours = 300 minutes

then,

→  A person can run in 5 hours:

= \(\frac{6}{24}\times 300\)

= \(\frac{1800}{24}\)

= \(75 \ km\)

By converting km into cm, we get

= \(7500000 \ cm\)

So the above is the right answer.

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Answer:

1st question: The moon is closer to Earth so it is easier to see and visit.

2nd question: The moon has a week/month cycle instead of a day/night cycle.

3rd question: The corona

Explanation:

Answer: A.HCI

Explanation:

Answer: 322.56 Kelvin

Explanation:

Use the Ideal Gas Law

\(PV=nRT\)

R is the gas constant

T is the temperature in Kelvins

P is the pressure in atmospheres

V is the volume in liters

n is the number of moles of gas

First, the mm of mercury need to be converted to atmospheres using the conversion factor 1atm = 760 torr.

\(751.2mmHg (torr) =0.988atm\)

Now plug everything in

\((0.988)(26)=(0.97)(0.0821)T\\T=322.56K\)

The number of moles of NaCl contained in 5 L of a 2.2 M solution is 11 moles

The molarity of a solution gives a relationship between volume and mole of substance. The mathematical relationship is given below:

Molarity = number of mole / Volume

With the above formula, we can determine the number of mole of NaCl in the solution. Details below:

Molarity = number of mole / Volume

Cross multiply

Number of mole = molarity × volume

Number of mole of NaCl = 2.2 × 5

Number of mole of NaCl = 11 moles

Thus, the number of moles of NaCl is 11 moles

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Answer:

105.98844 g/mol

Explanation:

The balanced molecular equation for the reaction is:

\(3Ca(NO_3)_2 + 2AlPO_4 \rightarrow Ca_3(PO_4)_2 + 2Al(NO_3)_3\)

The resulting ionic equation is:

\(3Ca^{2+} + 6NO_3^- + 2Al^{3+} + 2PO_4^{3-} \rightarrow Ca_3(PO_4)_2 + 2Al^{3+} + 6NO_3^-\)

The net ionic equation is:

\(2PO_4^{3-} + 3Ca^{2+} \rightarrow Ca_3(PO_4)_2\)

When calcium nitrate (Ca(NO₃)₂) and aluminum phosphate (AlPO₄) are mixed, they undergo a double displacement reaction. In the balanced molecular equation, the reactants are written in their molecular form, and the products are formed by exchanging the positive and negative ions. To balance the equation, we need three calcium nitrate molecules and two aluminum phosphate molecules:

\(3Ca(NO_3)_2 + 2AlPO_4 \rightarrow Ca_3(PO_4)_2 + 2Al(NO_3)_3\)

In the ionic equation, the soluble compounds dissociate into their respective ions. Calcium nitrate dissociates into three calcium ions (Ca²⁺) and six nitrate ions (NO₃⁻), while aluminum phosphate dissociates into two aluminum ions (Al³⁺) and two phosphate ions (PO₄³⁻). The equation becomes: \(3Ca^{2+} + 6NO_3^- + 2Al^{3+} + 2PO_4^{3-} \rightarrow Ca_3(PO_4)_2 + 2Al^{3+} + 6NO_3^-\)

The net ionic equation focuses on the essential ions involved in the reaction, excluding the spectator ions (ions that remain unchanged throughout the reaction). In this case, the nitrate ions are spectator ions. Thus, the net ionic equation is obtained by eliminating the nitrate ions from both sides of the equation: \(2PO_4^{3-} + 3Ca^{2+} \rightarrow Ca_3(PO_4)_2\)

The net ionic equation represents the core reaction, highlighting the ions directly involved in the formation of the product, calcium phosphate (Ca₃(PO₄)₂).

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Answer:

proton

A proton is composed of two up quarks, one down quark, and the gluons that mediate the forces "binding" them together.

The appropriate reagents for each reaction are

1. \(H_{2}\), Pd/C

2. \(H_{2}O\), \(H_{2}SO_{4}\)

3. HBr

4. \(H_{2}SO_{4}\) heat

5. mCPBA

6. NaOMe

7. \(Br_{2}\)

Orgаnic trаnsformаtion involves the conversion of one substrаte into аnother by the use of inorgаnic/orgаnic reаgents. The reаction scheme under considerаtion here involves vаrious trаnsformаtions on cyclopentene/cyclopentаnol. The trаnsformаtion involves oxidаtion, hydrаtion, dehydrаtion epoxide formаtion, аnd dihydroxylаtion.

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The difference in energy between the two levels responsible for the ultraviolet emission line of the magnesium atom at 202.5 nm is 419.4 kJ/mol

The energy of a photon may be calculated in ways: If the photon's frequency is known, we will use the formula E = h f . Max Planck proposed this equation, which is why it is called Planck's equation. If the photon's wavelength is known, the photon's energy may be calculated with the use of the system E = h c λ.

The frequency of a photon is described as how many wavelengths a photon propagates every second. in contrast to an electromagnetic wave, a photon cannot simply be of a coloration. instead, a photon will correspond to light of a given color.

calculation:-

Wavelength λ = 285.2 nm = 285.2 x 10-9 m

Energy difference ΔE = photon energy = hc/λ

= 6.626 x 10-34 x 2.998 x 108/285.2 x 10-9

= 6.965 x 10-19 J

where h is Planck constant and c is the speed of light

If you need the energy difference in kJ/mol, then multiply the above value by Avogadro's number:

ΔE(kJ/mol) = 6.965 x 10-19 x 6.022 x 1023

= 4.194 x 105 J/mol = 419.4 kJ/mol

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The formula that represents an isomer of the compound is formula 1 which has the same molecular formula as the compound; C₃H₈O.

Isomerism is a phenomenon that occurs when two or more organic compounds have the same chemical formula but distinct properties because of variations in the atoms' arrangements in space or along the carbon skeleton.

Isomers are molecules or polyatomic ions that have the same number of atoms in each element and the same chemical formula but have different spatial configurations of those atoms.

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Complete question :

A jeweler has five rings, each weighing 18 g, made of an alloy of 10% silver and 90% gold. She decides to melt down the rings and add enough silver to reduce the gold content to 75%. How much silver should she add?

Answer:

Kindly check explanation

Explanation:

Given the following :

Weight of each alloy = 18g

Initial % of Silver = 10% = 0.1

Initial % of Gold = 90% = 0.9

New % of gold = 75% = 0.75

Hence, new % of silver will be (1 - 0.75) = 0.25

Let the amount of silver to be added = s

Hence,

Initial gold content = final gold content + added silver

18 * 0.9 = 0.75(18 + s)

16.2 = 13.5 + 0.75s

16. 2 = 13.5 + 0.75s

16.2 - 13.5 = 0.75s

2.7 = 0.75s

s = 2.7 / 0.75

s = 3.6

S = 3.6

Hence the amount of silver needed per ring in other to reduce the gold content = 3.6g

Total for the 5 rings = (3.6 * 5) = 18g

The parameters that would be different for a reaction carried out in the presence of a catalyst compared to the same reaction carried out in the absence of a catalyst are: ΔH‡, Ea, and k.

When a catalyst is present in a chemical reaction, it provides an alternative pathway with lower activation energy (Ea) for the reaction to occur. This means that the catalyst lowers the energy barrier for the reaction, making it easier for the reactants to reach the transition state and form the products. Consequently, the activation energy (Ea) is reduced in the presence of a catalyst.

The enthalpy change of the transition state (ΔH‡) is also affected by the presence of a catalyst. Since the catalyst provides an alternative pathway, the transition state formed in the presence of the catalyst may have a different enthalpy compared to the transition state in the absence of a catalyst.

Additionally, the rate constant (k) of the reaction is influenced by the catalyst. The catalyst increases the rate of the reaction by providing an alternative reaction pathway with a lower activation energy. As a result, the rate constant (k) is generally higher when a catalyst is present.

Therefore, the parameters that differ for a reaction carried out in the presence of a catalyst compared to the absence of a catalyst are ΔH‡, Ea, and k.

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