when you drop the soap it the floor clean or is the soap dirty? But how can the soap be dirty if the soap cleans the floor?

Question 17.

We are given the following balanced equation:

The reactant in excess is H2O, meaning the limiting reactant is Fe. We will first calculate the number of moles of Fe, use those moles to get Fe3O4 number of moles, then convert moles to mass.

We want to calculate the moles of Fe3O4 that will be produced, given:

mass of Fe = 500 g

we know

molar mass of Fe = 55,845 g/mol

molar mass of Fe3O4 = 231,533 g/mol

The molar ratio between Fe and Fe3O4 is 3:1

So:

Number of moles of Fe3O4 = 2.98 mol

According to molar concentration and pH concept, the pH of this solution is 0.808.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.Substitution of values in formula gives, molarity= 12.5/40×1/2=0.156 M  which is H+ concentration, thus pH=-log[H+]=-log[0.156]=0.808 M.

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Given what we know about the forces that act upon objects, we can confirm that an object to which balanced forces are applied will not be in motion.

Therefore, we can confirm that since the forces that are acting on the object are balanced, meaning that each force is matched by an opposite force of the same magnitude, the object will not move. For this object to move, the forces would have to become unbalanced by increasing the magnitude of one.

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The final temperature of the water is: T_final = 45.0°C

We can use the formula for the specific heat capacity of the water to solve this problem:

q = mcΔT

First, we can calculate the initial energy of the water:

q = mcΔT

q = (10.0 g) (4.184 J/g°C) (25.0°C)

q = 1,046 J

Next, we can calculate the final temperature after absorbing 840 J:

q = mcΔT

840 J = (10.0 g) (4.184 J/g°C) (ΔT)

ΔT = 20.0°C

Therefore, the final temperature of the water is:

T_final = T_initial + ΔT

T_final = 25.0°C + 20.0°C

T_final = 45.0°C

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11460 years ago a sample of wood was the part of a living tree.

The time required for half of something to undergo a process.

Carbon-14 has a half-life of 5,730 years. That means that no matter how many carbon-14 atoms were present when something died, after 5,730 years only half of them are left the rest have decayed to nitrogen.

The half life of C-14 is \(t_{\frac{1}{2}}\) =5730 years.

This means that if you start with a sample of 100g, only 50g will be left in 5730 years.

Here, Only 25g is left, therefore the number of years is =5730 × 2  = 11460years.

Hence, 11460 years ago a sample of wood was the part of a living tree.

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Answer:

The number by which we divide is called the divisor. The result obtained is called the quotient. The number left over is called the remainder.

Explanation:

Answer:

D.) rain water seeps into the ground

Explanation:

Obviously?

Answer:  D) If the reaction occurs in the gas phase

Explanation:

Answer: its vein

Explanation:

Answer: It’s blood

Explanation:

I did the quiz

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

CH3CH=C(CH3)CH=CHCH2CH3

Explanation:

This question is all about determining the stability for Dienes. Dienes are divided into three major parts that is the cumulated diene, Isolated dienes, and conjugated dienes.

Among the three types or classes of dienes, the conjugated type of diene is the most stable. That is to say that among the five compounds given in the question the most stable is CH3CH=C(CH3)CH=CHCH2CH3 which is a conjugated diene.

The reason behind the stability of this compound, that is CH3CH=C(CH3)CH=CHCH2CH3 is because of what is known as delocalization . Hybridization and Resonance are what causes the delocalization which involves pie interactions with alpha hydrogen, also, another reason behind the stability is the lower heat of hydrogenation.

Answer:

It indicates how fast reactants become products

Once alcohol is in the bloodstream it will reach the brain in a few seconds to minutes, depending on various factors such as the amount and concentration of alcohol consumed, body weight, metabolism, and other individual factors.

Alcohol can swiftly cross the blood-brain barrier after it is ingested, having an impact on the brain and neurological system. Depending on the quantity and frequency of drinking, alcohol's effects on the brain can range from minor disturbances in judgment and coordination to more serious consequences including loss of consciousness and, in the worst circumstances, death.

Long-term changes in brain structure and function, such as cognitive impairment and a higher chance of developing specific neurological and mental illnesses, can also result from chronic alcohol consumption.

Once alcohol is in the bloodstream it will reach the brain in a few seconds to minutes, depending on various factors such as the amount and concentration of alcohol consumed, body weight, metabolism, and other individual factors.

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Answer:

2 m/s

Explanation:

Applying the formulae of velocity,

V = d/t............. Equation 1

Where V = Velocity of the body, d = distance, t = time

From the question,

Given: d = 600 m, t = 5 minutes = (5×60) = 300 seconds.

Substitute these values into equation 1

V = 600/300

V = 2 m/s.

Hence the velocity of the body when it travels is 2 m/s

Answer:

C.

Explanation:

Answer:

That depends on the amount. Solubility is the maximum amount of salt dissolved in 100 g of water. So, if the amount is within limit, then yes. Solubility of anhydrous copper sulfate is 24.3 g/100 g water, so it is not bad. Put it in perspective, the solubility of NaCl is about 35 g/100 g water at room temperature. If the amount of copper sulfate is unknown, qualitative I'd say solid copper sulfate will dissolve in water completely.

Explanation:

If you use the pentahydrate CuSO4.5H2O then the solubility at 20°C is 20.8g/100ml H2O

If you use the anhydride, CuSO4. then the solubility at 20°C is 36.2g/100ml H2O

Enthalpy change (H) and entropy change (S) are 11.7 103 Jmol-1 and 105 Jmol-1K-1, respectively, for a reaction at 25 °C.

The absolute entropies of a reactants and their products are S°(N2H4) (= half of this period J/(mol•K), S°(N2) = 191.6 J/(mol•K), or S°(H2) = 130.7 J/(mol•K) at 25°C, where the standard enthalpy change (H°) is 50.6 kJ/mol.

E0 is known as 0.268 V at standard potential at 25°C, despite a slight variation in the computed value above. Similar to a silver-silver chloride electrode, the electrode potential is dependent on the chloride ion concentration.

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Answer:

Potassium, sulfur, fluorine, barium

The elements that will lose one electron are:

a. sodium

d. Potassium

An element in its natural state has an equal number of protons and electrons, giving it a net charge of zero; however, when an element loses an electron as part of a chemical reaction it becomes positively charged, or oxidized.

Out of the given options, sodium and potassium looses one electron and attains a positive charge leading to the formation of cation. While Fluorine and chlorine gains one electron and attains a negative charge leading to the formation of anion.

Thus, correct options are a and d.

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Answer:

Aneroid barometer and mercury barometer are such two types. The main difference between aneroid and mercury barometer is that aneroid barometer measures the atmospheric pressure using the expansion of a metal whereas mercury barometer measures the atmospheric pressure by adjusting the height of mercury inside a tube.

Explanation:

Coarse and excellent adjustment The coarse adjustment knob  solely be used with the lowest electricity objective lens. Once it is in focus, you will only need to use the best focus. Using the coarse center of attention with greater lenses may result in crashing the lens into the slide.

You must have the object situated before you exchange objectives to increase the magnification, because the subject of view turns into smaller; if the object is off to the side, it might also disappear when you go to higher magnification.

The optics of a microscope's lenses alternate the orientation of the photo that the consumer sees. A specimen that is right-side up and going through proper on the microscope slide will appear upside-down and going through left when considered through a microscope, and vice versa.

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The ink dyes that travel to the top of the paper have a greater affinity for the mobile phase than the stationary phase whereas the other ink dyes that remained near the bottom of the paper have a greater affinity for the stationary phase than the mobile phase.

Chromatography is the process by which molecules of colored subtances such as dyes are separated based o their affinity for a particular solvent or solid phase as well as based on their molecular weights.

Chromatography separates substances based on differences in their physical properties.

In a chromatographic setup, there are two phases:

In the given chromatographic separation process, the dye to be separated is applied o the stationary phase and a mobile phase is allowed to move over the dye.

The particles of the dye are separated based on their affinity for either the stationary or mobile phase.

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Answer:

30 yard per second

Explanation:

300/10 = 30

The cost of the patch : = 887.84 cents

Given

16.2 cm² patch

cost = $3.58/in²

Required

The cost of the patch

Solution

We must pay attention to the conversion factor when changing units

1 cm² = 0.155 in²

16 cm² = 2.48 in²

Cost :

= $3.58/in² x 2.48 in²

= $8.8784

1 dollar is equal to 100 cents, so :

= $8.8784 x 100 cents/$

= 887.84 cents

Like charges repel each other, while opposite charges attract each other. This principle is one of the fundamental aspects of electrostatics. According to Coulomb's law, the force between two charged particles is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

As the distance between two charged particles decreases, the force between them increases. This is because the closer the particles are, the stronger the electric field they create, leading to a stronger force of interaction.

On the other hand, as the magnitude of the charges decreases, the force between the particles also decreases. This is because the force is directly proportional to the product of the charges. If one or both of the charges are smaller, the force they exert on each other will be weaker.

In summary, according to Coulomb's law, decreasing the distance between charged particles increases the force between them, while decreasing the magnitude of the charges decreases the force. This understanding of the relationship between charge, distance, and force is crucial in explaining the behavior of charged particles and the interactions between them.

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The characteristics of the reflection of sunlight allow us to find that the correct result for the phase of the moon to go from illuminated to dark, the correct answer is:

The solar system is made up of the sun, planets, satellites and other small bodies, of all these the only object that can emit light is the Sun, all of which can only reflect light from the Sun.

In the Sun - Earth - Moon system shown, the observation of the moon occurs by reflected light coming from the Sun.

Let's analyze the different positions shown:

Point X. The moon is between the Earth and the Sun, therefore there is no light reflected back to the Earth the Moon looks dark

Point W. The moon, the sun and the Earth form 90º, therefore only a part of the light is reflected towards the earth.

Point Z. At this point the objects are in a line Sun Earth and Moon, for which all the light is reflected towards the Earth

Point Y. At this point there is 90º between the sun, the earth and the moon, sun a part of the light is reflected

For the question in which points we see the image of the illuminated moon to dark moon.

Let's analyze the possibilities that the points  Y and W the sun reflect a fraction of the light,  

The points X and Z do not reflect all or all reflect of the light.

They ask the point for which the system stops lighting up

In this case the moon must reflect some light, position Y and move to the point where it does not reflect any light, position x

Let's review the different answers to find the correct one is;

In conclusion with the characteristics of the reflection of sunlight, we can find that the correct result for in which phase the moon goes from illuminated to dark moon, the correct answer is:

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The specific heat capacity of the given metal is 0.1234 J/g°C.

The specific heat capacity of a metal is the electricity required to elevate one kilogram (kg) of the cloth by one diploma Celsius (°C).

The specific heat capacity of a substance is the heating ability of a pattern of the substance divided by means of the mass of the pattern, also every so often called massic heat ability. precise warmth capability is a measure of the amount of heat power required to change the temperature of 1 kg of a material by 1 k.

q = m x C x DT

q = m x C x ( T f - T i )

q = amount of heat energy gained or lost by a substance

m = mass of the sample

C = heat capacity ( J oC⁻¹g⁻¹ or J K⁻¹ g⁻¹ )

T f = final temperature

T i = initial temperature

-q metal = q water

-(mCΔT) = mCΔT

-( mC (T f-T i ) =  mC( T f-T i )

- (240 g x C x (27°C-150°C) =  150g(4.18J/g°C ) × ( 27°C-21°C )

- ( 240g × C × -127 °C = 150 × 4.18 × 6°C

C =  150 × 4.18 × 6°C / 240g × -127 °

C = 3762 / 30480

C = 0.1234 J/g°C

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The name of the aromatic hydrocarbon shown in the photo is 1,4-dimethylbenzene.

Xylene, xylol or dimethylbenzene is a derivative of benzene. It is made up of carbon and hydrogen. It is a colorless, flammable liquid with a toluene-like odor. This aromatic hydrocarbon is a good solvent, we find it in many fuel formulations.

This aromatic hydrocarbon is found in different substances such as some oils, in coke gases (combustible gases that have a luminous flame when burned) and in gases obtained from the distillation of wood.

Xylenes are substances that can affect the functions of living beings, their vapors can give different symptoms such as nausea, headache and discomfort.

Therefore, we can confirm that the name of the aromatic hydrocarbon shown in the photo is 1,4-dimethylbenzene.

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Answer:

joib

Explanation:

Answer: human induced global warming

Explanation:

It’s the only one that makes sense if you read the question

The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.

To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.

The ideal gas law equation is given by:

PV = nRT

Where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

At STP, the pressure is 1 atm, and the temperature is 273.15 K.

From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.

Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.

Therefore, the volume of I2 gas formed is 21 L.

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