The fuel tank of a car can hold 75 litre If it take 5 min to fill the tank, what is the flow rate of fuel from the pump. Assume the relative density of the fuel is 0.68.​

Weathering changes the chemical and physical nature of an element that is why it is often difficult to identify a highly weathered mineral.

The breakdown and alteration of rocks and minerals at or near the Earth's surface as a result of exposure to various weathering agents, such as water, wind and temperature changes is known as weathering.

Minerals can undergo physical changes as a result of weathering, such as being broken up into smaller pieces or having their color and texture altered. Additionally, it may result in chemical alterations such as the removal or addition of specific chemical components.

This may lead to the creation of brand-new minerals or the modification of already existing minerals into new ones.  Highly weathered minerals might not still possess the same physical and chemical characteristics as their unweathered counterparts.

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Answer:

C

Explanation:

It looks pretty reasonable to me

Answer:

False

Explanation:

The given statement stating that resistance  is the slowing of the flow of electrons and where some of the electrical energy is converted into heat is true and it is a opposite of conduction.

Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.

In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .

When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:

1) heat conduction

2) electrical conduction

3)sound conduction

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The ionic and net ionic equation for HCl + Mg(C2H3O2)2 ⇒ MgCl2 + HC2H3O2 is H⁺ + Cl⁻ + Mg⁺ + C₂H₃O₂⁻ → Mg⁺ + Cl₂⁻ +  H⁺ + C₂H₃O₂⁻.

Ionic equations are chemical equations that only show the ions involved in a chemical reaction. In other words, ions that combine in solution to form new substances. The ions that do not participate are referred to as spectator ions.

A net ionic equation depicts only the chemical species involved in a reaction, whereas a complete ionic equation depicts the spectator ions as well.

Thus,  H⁺ + Cl⁻ + Mg⁺ + C₂H₃O₂⁻ → Mg⁺ + Cl₂⁻ +  H⁺ + C₂H₃O₂⁻ this is the net ionic equation.

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The balloon will be filled by a gas, and as the gas is not escaping we can assume that it is at a constant pressure.

The KMT (Kinetic Molecular Theory) explains the macroscopic properties of gases. This theory states that gases are formed by particles in constant motion, and that their kinetic energy is directly proportional to the temperature of the gas.

If we leave the balloon filled with gas in the sun we assume that the temperature of the gas inside will start to rise. When the temperature starst to rise, and the pressure is constant, particles will gain kinetic energy. This will result in particles moving faster and coliding with each other and with the balloon's walls more often. As a consecuence the particles will tend to stay farther from one another and the volume of the balloon will increase.

This is an example of Charles's Law that states that at constant pressure the volume of a gas is directly proportional to its temperature. In other words, when the temperature of the gas increases the volume increases as well.

To summarize, if we fill a balloon and we leave it in the sun its volume will increase.

Answer:

It is a step by step process

Explanation:

You cannot do the experiment and lab report without following the steps

Hope this is correct and helpful

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Answer: Approximately 22.04% of the original.

Explanation: Radioisotopes, like iodine-131, have unstable nuclei. To become stable, they eject some particle (alpha or beta) or energy (gama).

Half-life is a time for half of the substance to decay. Activity is rate of decay, i.e., the number of decays per unit time.

Half-life and Activity are related by the following:

\(A=A_{0}.\frac{1}{2^{n}}\)

where

A is activity

\(A_{0}\) is initial activity

n is number of half-lives passed in t

For iodine-131, half-live is 8.02, so in 17.5 it has passed:

\(n=\frac{17.5}{8.02}\)

n = 2.182

Final activity will be:

\(A=\frac{A_{0}}{2^{2.182}}\)

\(A = 0.2204A_{0}\)

Which means after 17.5 days, there were 22.04% of the original iodine-101.

Answer:

maximum amount of solute that is capable of being dissolved

Answer: A solution that contains a maximum amount if solute that is capable of being dissolved

Explanation:

A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved.

The identity of a cation solution that produces a mix of red and yellow colors in a flame test, but appears red when viewed through a cobalt filter, can be attributed to the presence of the strontium (Sr) cation.

During a flame test, different metal cations emit characteristic colors due to the excitation of electrons and their subsequent emission of light. Strontium, in particular, is known to produce a vibrant red color in flame tests.

The presence of both red and yellow colors indicates the possibility of multiple metal cations in the solution. While the specific metal responsible for the yellow color is uncertain, it could potentially be sodium or another metal that emits a yellow flame.

When the flame is viewed through a cobalt filter, which absorbs yellow wavelengths of light, the yellow color is filtered out, resulting in only the red color being observed. Since strontium is known for its distinctive red flame color and its emission is not affected by the cobalt filter, it is likely the metal cation responsible for the observed red color. Therefore, based on these characteristics, the identity of the cation solution is most likely strontium (Sr).

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Answer:

The answer to your question is given below.

Explanation:

We'll begin by converting 100 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

100 mL = 100 mL × 1 L / 1000 mL

100 mL = 0.1 L

Next, we shall determine the number of mole of NaCl in the solution. This can be obtained as follow:

Volume of solution = 0.1 L

Molarity of NaCl = 0.250 M

Mole of NaCl =?

Molarity = mole / Volume

0.250 = mole of NaCl / 0.1

Cross multiply

Mole of NaCl = 0.250 × 0.1

Mole of NaCl = 0.025 mole

Finally, we shall determine the mass of 0.025 mole of NaCl. This can be obtained as follow:

Mole of NaCl = 0.025 mole

Molar mass of NaCl = 23 + 35.5

= 58.5 g/mol

Mass of NaCl =?

Mole = mass / Molar mass

0.025 = mass of NaCl /58.5

Cross multiply

Mass of NaCl = 0.025 × 58.5

Mass of NaCl = 1.46 g

Thus, to prepare the solution, weigh out 1.46 g of NaCl and dissolve in 1 L of water.

The volume of the solids are found in the attached table.

Volume of a substance refers to the amount of space a given mass of the substance occupies.

Since liquids have no definite volume, the volume of liquids are measured using containers.

Also, the volume of solids can be determined by displacing liquids.

The unit for measuring  the volume of a liquid substance is liters.

Other multiples of the base unit are, mL, cL, dL, daL, hL, kL.

Considering the given volume of substances, the table can be filled as seen in the attachment.

In conclusion, the volume of solids was determined by displacing liquids water.

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The alcohol and water molecules sharing the same space leads to a more compact arrangement of the molecules in the combination, which is the best explanation for the observed drop in volume.

In this illustration, adding water to alcohol results in a final volume that is roughly 10% lower than the combined volumes of the two liquids. The "vanishing volume" results from variations in how the solvent molecules are packed in the mixture compared to the pure components.

Alcohol molecules slide into the spaces between the water molecules as it dissolves, reducing the volume.

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If 50cm³ of alcohol is mixed with 50cm³ of water. The volume of the mixture is 97cm³. What is the best explanation for this observation?

A. Water evaporates leading to decrease in volume of the mixture

B. Water and alcohol molecules react and form a compact solution

C. Alcohol being volatile evaporates and decreases the volume of the mixture

D. The alcohol and water molecules sharing the same space leads to the decrease in volume of the mixture

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

The correct answer is A. Since the system is cooled, the reaction will try to generate heat to compensate for the loss.

According to Le Chatelier's principle, the system will shift in the direction that opposes the stress. In this case, cooling is the stress and the system will shift in the direction that produces heat.

Therefore, the reaction will shift to the right (products) to generate heat. This will cause the concentration of HI to increase, while the concentrations of H₂ and I₂ decrease, according to the stoichiometry of the reaction. Therefore, the correct answer is A. The reaction shifts to the right (products) and the concentration of HI increases.

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Answer: The reaction shifts to the left (reactants) and the concentrations of H^2 and I^2 increase is correct. (Answer C)

Answer:

             0.1608 mol/L

Explanation:

Calculate moles as,

Mole = Mass/M.Mass

Mole = 31.4 g / 78.045 g/mol

Mole = 0.402 mol

Now,

Molarity = Moles / Vol. in L

Molarity = 0.402 mol / 2.5 L

Molarity = 0.1608 mol/L

Answer:

730×10 6 g

Explanation:

each one mole of NH4NO3 has 2 moles of nitrogen (2×14)

N NH4NO3

2×14 14+(4×1) +14+(3×16)

28 80

? 2.086 × 10 9

2.086× 10 9 ×28 ÷80 = 730 × 10 6 g of Nitrogen

Answer:

the family have been served dinner with the kids

the house has been watched by the police for week

the lights went off when i was doing my home work

Answer:

follow hypothesis bud

Explanation:

yep

A dam constructed to produce tidal power does so by harnessing water flow to drive turbines and electric generators .

Tidal energy was employed in grain mills to crush grains mechanically, just like wind energy was. grain crushing Here, the tidal energy generated by the turbines was used. Hydroelectric dams, which serve as significant energy storage, also employ tidal energy to store energy.

Tidal power can harm marine life because tidal turbines' whirling blades can cause marine organisms to perish. Fish habitations in tidal power settings may be impacted by noise from the turbines' rotation. Tidal energy can also affect how sediment and water are processed.

Therefore, option B is correct.

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Answer:

B. first level consumers.

Explanation:

The first level consumers are also the primary consumers. They are the animals that depends or rely on plants to transform chemical energy into carbohydrates and sugar.

Primary consumers are mostly herbivores. They feed on plant matter by which they derive their nutrition. They have special enzymes that helps to convert plant materials into substances needed for their body.

So, the first level consumer takes plant matter and convert them into useful food materials for their own nutrition.

The second level consumers depend on the first level consumers for nutrition.

The heat (kJ) released to the surroundings : -70.56 kJ

Reaction

CH₄(g) + 3Cl₂(g) → CHCl₃(l) + 3HCl(g) ΔH°=-336 kJ

For 3 mol HCl formed ⇒ ΔH°=-336 kJ

23.0 g of HCl :

\(\tt \dfrac{23}{36.5}=0.63\)

Heat released for 0.63 mol HCl :

\(\tt \dfrac{0.63}{3}\times -336=-70.56~kJ\)

The heat (kJ) released to the surroundings at the given equation is 70.7KJ.

We know that

\(Moles\ or\ HCl\ formed = mass \div molar\ mass\\\\= 23.0\div 36.46\)

= 0.631 mole

Since energy should be related at the time when 3 moles of HCI should be generated = 336 K

Now energy released is  

\(= (336\div 3)\times 0.631\)

= 70.65 kJ

Hence we can conclude that heat released to the surrounding is 70.7 kJ.

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Answer:

From the given equation, we can see that for every 2 moles of Al, we get 3 moles of H2

So, we can say the the number of moles of H2 is 3/2 times the number of moles of Al

We are given the number of moles of Al and we have to find the number of moles of H2

We have deduced the relationship:

Moles of Al * 3 / 2 = Moles of H2

Replacing the variables with given values

3.5 * 3 / 2 = Moles of H2

Moles of H2 = 5.25 moles

An ionic equation for sodium hydroxide and calcium carbonate is Na⁺ + OH⁻ + Ca²⁺ + CO₃²⁻\(\rightarrow\)Na⁺ +CO₃²⁻ + Ca²⁺ + OH⁻.

Ionic equation is defined as a chemical equation which represents electrolytes in aqueous solutions and are expressed as dissociated ions. Ions present in aqueous solutions are stabilized by ion dipole interactions with the water molecules which are present.

An ionic equation can be written for any electrolyte which dissociates and reacts with the polar solvent. In a balanced ionic equation , number and type of atoms on each sides of reaction arrow are same. Even the net charge on both sides of the arrow is same.

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The kJ of the energy absorbed for the every mole of the carbon reacted is 104.8 kJ.

The chemical equation is as :

2C + 2H ---> C₂H₄   ,     ΔH = + 52.4 kJ/mol

The ΔH is the enthalpy change that is determined by the subtracting the energy of the reactants to the products.

The  ΔH = energy of the products - energy of the reactants

The expression for the energy is as :

q = n ΔH

Where,

n = number of the moles

ΔH = enthalpy change

The kJ of the energy absorbed for the every mole of the carbon reacted :

q = 2 mol × 52.4 kJ/mol

q = 104.8 kJ

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Answer:

The binding energy of a mole of the nuclei is 252KJ

Explanation:

The binding energy is the amount of energy required to separate an atom into its nuclei.

From Einstein's relations,

       E = Δm\(c^{2}\)

where E is the energy, Δm is the mass defect and c is the speed.

The mole of nuclei moves with the speed of light, so that;

  c = 3.0 × \(10^{8}\) m/s

Given that Δm = 0.00084Kg/mol, the binding energy is calculated as;

       E = 0.00084 × 3.0 × \(10^{8}\)

         = 252000

        = 252KJ

The binding energy of a mole of the nuclei is 252KJ.

Answer:

7.55×10^10 KJmol-1

Explanation:

The actual mass of a nucleus is usually less than the sum of the masses of the constituent neutrons and protons that make up the nucleus. This difference is called the mass defect.

The mass defect is related to the binding energy holding the neutrons and protons together in the nucleus. Since energy and mass are related by Einstein's equation;

E=∆mc^2 where;

E = binding energy of the nucleus

∆m= mass defect of the nucleus

c= speed of light

The larger the mass defect, the larger the binding energy of the nucleus and the more stable the nucleus.

From the data provided;

Mass defect= 0.00084 kg/mol or 0.84g/mol

Since 1 g/mol= 1 amu

0.84g/mol= 0.84 amu

The conversion factor from atomic mass units to MeV is 931

Binding energy = 0.84 × 931= 782.04 MeV

Since 1eV= 96.49KJmol-1

782.04×10^6eV= 7.55×10^10 KJmol-1

Answer:25,06 kJ of energy must be added to a 75 g block of ice.

ΔHfusion(H₂O) = 6,01 kJ/mol.

T(H₂O) = 0°C.

m(H₂O) = 75 g.

n(H₂O) = m(H₂O) ÷ M(H₂O).

n(H₂O) = 75 g ÷ 18 g/mol.

n(H₂O) = 4,17 mol.

Q = ΔHfusion(H₂O) · n(H₂O)

Q = 6,01 kJ/mol · 4,17 mol

Q = 25,06 kJ.

Explanation:

The factors that affect electronegativity is Number of electrons and atomic radius. Option A

The term electronegativity has to do with the the bonding situation between two atoms. In this situation, the electrons of the bond would be closer to one of the atoms than the other. In that case, there would be an unequal sharing of the electrons.

There are several facts that affect the electronegativity of an atom and these are the things that determine how electronegative that any particular atom would be.

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Answer: Cytosine, Thymine, Cytosine, Guanine (option A)

Explanation:

In DNA strands, you must use base-pairing rules to complete strands.

The base-pairing rules are:

Adenine (A) bonds with Thymine (T)

Guanine (G) bonds with Cytosine (C)

By using these rules, you can pair the sequence GAGC with CTCG

The sequence CTCG is also represented as the bases Cytosine, Thymine, Cytosine, and Guanine, making A the correct answer.

I hope this helps!