Which of the following is an example of chemical energy being used?
A.Eating a sandwich
B.Reading a book
C.Switching on a fan
D.Turning on the light

To separate a mixture of Mn(aq) and Zn(aq) using the process of separation, you can add the reagent NaOH.

When NaOH is added, it acts as a reagent. It will react with Mn(aq) to form a solid maganese hydroxide Mn(OH)2  precipitate, while Zn(aq) remains in the solution. The mixture can then be centrifuged to separate the solid from the solution. The supernate containing Zn(aq) can be decanted into a separate test tube, effectively separating the two chemical species. Therefore, the correct answer is a. NaOH. The separation is achieved due to the different sedimentation rates of the components. The sedimentation rate depends on factors such as the mass, size, shape, and density of the particles. By spinning the sample at high speeds for a specific duration, the components can be effectively separated based on their sedimentation properties.

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The enthalpy change for the formation of hydrogen peroxide is -473.6 kJ.

To calculate the enthalpy change for the formation of hydrogen peroxide (H2O2), we can use the given data:

The enthalpy change for the decomposition of hydrogen peroxide:

H2O2(l) → H2O(l) + 1/2 O2(g) ΔH = -98.0 kJ

The enthalpy change for the formation of water (H2O) from hydrogen gas (H2) and oxygen gas (O2):

2 H2(g) + O2(g) → 2 H2O(l) ΔH = -571.6 kJ

We want to find the enthalpy change for the formation of hydrogen peroxide, which is the reverse of the decomposition reaction.

Since the enthalpy change is additive, we can reverse the sign of the decomposition reaction and add it to the formation of water reaction:

Reverse of decomposition reaction:

H2O(l) + 1/2 O2(g) → H2O2(l) ΔH = 98.0 kJ

Adding the two reactions:

2 H2(g) + O2(g) → 2 H2O(l) ΔH = -571.6 kJ

H2O(l) + 1/2 O2(g) → H2O2(l) ΔH = 98.0 kJ

By adding these equations, we can cancel out the water (H2O) on both sides to obtain:

2 H2(g) + O2(g) → H2O2(l) ΔH = -473.6 kJ

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Answer:

Gadolinium 64

Gallium 31

Germanium 32

Explanation:

There is no such element as G in the periodic table.

What is an element?

A chemical element is a type of atom with a particular number of protons in the nucleus, such as the specific compound made up entirely of that species. Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical reaction. The number of protons in the nucleus is an element's defining attribute, and it is symbolised by the symbol Z - all atoms with the same atomic number are atoms of the same element. Atoms are rearranged into new compounds linked together by chemical bonds when various elements undergo chemical reactions.

There is no such element as G in the periodic table.

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The volume of steam that could be produced at STP if 12.8 g of oxygen reacts with excess hydrogen is 17.92 L

We'll begin by obtaining the mole of steam produced. This can be obtained as follow:

2H₂ + O₂ -> 2H₂O

From the balanced equation above,

1 mole O₂ reacted to produce 2 moles of steam, H₂O

Therefore,

0.4 mole O₂ will react to produce = 0.4 × 2 = 0.8 mole of steam, H₂O

Finally, we shall determin the volume as follow:

At standard temperature and pressure (STP),

1 mole of H₂O = 22.4 L

Therefore,

0.8 moles of H₂O = (0.8 mole × 22.4 L) / 1 mole

0.8 moles of H₂O = 17.92 L

Thus, we can conclude that the volume produced is 17.92 L

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Answer: everybody report fNnasks he doesn't answer nobody question if you see it like you told me do it yourself science is super easy

Explanation:

Answer:

It's C.

Explanation:

According to the site, "http://needtoknow.nas.edu/energy/energy-sources/renewable-sources/wind/" ... "Wind energy is an indirect form of solar energy created by a combination of factors, including the uneven heating of Earth’s atmosphere by solar radiation, variations in topography, and the rotation of Earth. People have been putting wind energy to use throughout history to propel sail boats, mill flour from grain, and pump water."

Answer:

I don't have access to any specific information about the genetics or family history of any individual. However, in general, it's important to note that humans do not have the genetic variation that could result in blue skin.

There are some genetic conditions, such as methemoglobinemia, that can cause a bluish discoloration of the skin, but these conditions are very rare and typically have other serious health effects. In general, the chances of a child being born with blue skin are essentially zero.

It's important to remember that genetics is a complex field, and the inheritance of traits depends on many different factors. The likelihood of a particular trait being passed down from parents to offspring depends on the specific genes involved, their dominance or recessiveness, and other factors such as environmental influences. In general, the inheritance of most traits is determined by the combination of genes from both parents, and predicting the likelihood of a particular trait appearing in an individual child is not always straightforward.

The reaction will produce 6.61 mole of magnesium oxide.

What is the purpose of magnesium oxide?

There are several uses for magnesium oxide. Some people use it as an antacid to treat acid indigestion, digestive problems, and heartburn. Magnesium oxide can also be used as a laxative to quickly and temporarily empty the bowels (before surgery, for example).

Briefing:

This clearly demonstrates that 100.95g magnesium nitride reacts with 108.06g of water to give stoichiometric ammonia and magnesium oxide.

moles of Mg3N2 = 3.82g /100.95g per mole =0.0387 mole

mole of OH2 = 7.73g/18.01g per mole

magnesium oxide, i.e. 0.0387 mole × 58.32g per mole= 6.61mole

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Answer:

1 or a

Explanation:

The number of grams in each mole of hydrogen gas is smaller than the number of grams in each mole of propane gas.

To solve such this we must know the concept of Combustion reaction. Therefore, the correct option is option A that is  the number of grams in each mole of hydrogen gas is smaller than the number of grams in each mole of propane gas.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water.

Propane has an energy of combustion of 2220 kilojoules per mole while hydrogen gas (rocket fuel) has an energy of combustion of 286 kilojoules per mole. Hydrogen gas has a much higher energy of combustion per gram than propane because the number of grams in each mole of hydrogen gas is smaller than the number of grams in each mole of propane gas.

Therefore, the correct option is option A.

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A tank contains 8l of water in which is dissolved 32 g (grams) of chemical. a solution containing 2 g/l. The amount of chemical in the tank after 20 minutes is 98.66 g.

Given that:

rate r1 = 4 L/min

rate r2 = 2 L/min

concentration c1 = 2 g/L

V(0) = 8 L

A(0) = 32 g

the equation is given as :

ΔV = r1 Δt - r2Δt

dV/dt = 2

integrating the condition , we get

V(t) = 2(t+4)

ΔA  = c1r1 Δt - c2r2 Δt

dA/ dt = 8-2c2

c2 = A/ V

dA/dt = 8 - 2A/ V

now by putting the value of V, we get

dA / dt + 1 / t + 4 A = 8

linear equation has integrating factor :

I = e^ ∫ 1/( t + 4) dt = t + 4

d [ ( t + 4)A] / dt = 8 (t + 4)

(t+ 4 )A = 4(t + 4)² + c

A(t) = (1 / t + 4 ) [ 4(t + 4)² + c]

A(0) = 32 means c = 64

A(20) = (1/6) [(24)² + 16]

          = 296 / 3

          = 98.66 g

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Answer:

Using two coils of wire wrapped around an iron core produces an input voltage and output voltage.

Explanation:

Answer:

49

Explanation:

Según la pregunta;

Relación de número atómico a número de neutrones = 7: 5

Debemos tener en cuenta que el número de neutrones = número de masa - número atómico.

Dado que el número total es 84

Sea el número atómico x

Por eso;

7/5 = x / 84 -x

7 (84 -x) = 5x

588 - 7x = 5x

588 = 5x + 7x

588 = 12 veces

x = 588/12

x = 49

Dado que número atómico = número de protones = número de electrones

El número de electrones = 49

The purpose of the calibration curve is to determine the concentration of a solution.

It is absolutely necessary for this experiment because it establishes a relationship between the measured response of an instrument (e.g., absorbance) and the concentration of the analyte. This relationship allows for the quantification of unknown samples based on their measured response.

In many analytical experiments, such as spectrophotometric analysis, the concentration of a solution is determined by measuring a physical property, such as absorbance or fluorescence. However, the instrument response alone does not provide the concentration information. The calibration curve is created by analyzing a series of standard solutions with known concentrations of the analyte.

By plotting the measured instrument response (e.g., absorbance) against the known concentrations, a linear relationship or a curve can be established. This calibration curve serves as a reference or standard to determine the concentration of unknown samples by comparing their instrument response to the curve.

Without the calibration curve, it would be impossible to accurately quantify the concentration of the analyte in the unknown samples. Thus, the calibration curve is essential for obtaining accurate and reliable results in the experiment.

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Answer:

56160grams

Explanation:

First, we need to convert the number of molecules of magnesium chloride (MgCl2) into moles by dividing by Avagadro's number (6.02 × 10^23 molecules)

n = nA ÷ 6.02 × 10^23

n = 14.07 × 10^26 ÷ 6.02 × 10^23

n = 14.07/6.02 × 10^(26-23)

n = 2.34 × 10^3 moles of MgCl2

The balanced reaction given in the question is as follows:

Mg + 2HCl → MgCl2 + H2

If 1 mole of Mg produced 1 mole of MgCl2

Then, 2.34 × 10^3 moles of Mg will also produce 2.34 × 10^3 moles of MgCl2.

Using mole = mass ÷ molar mass (MM)

Molar mass of Mg = 24g/mol

mass = mole × MM

mass = 2.34 × 10^3 × 24

mass = 56.16 × 10^3

mass = 56160grams.

Answer:

2 C2H2 (g) + 5 O2 (g) → 4 CO2 (g) + 2 H2O (l)

Explanation:

Redox reaction: In this type of reaction, oxidation and reduction reaction occurs simultaneously in same chemical reaction.

2C_2H_2+5O_2\rightarrow 4CO_2 + 2H_2O2C

2

H

2

+5O

2

→4CO

2

+2H

2

O

This reaction is a redox reaction :

Removal of hydrogen or addition of oxygen is termed as oxidation. in above reaction, removal hydrogen from acetylene gives carbon-dioxide.

Removal of oxygen or addition of hydrogen is termed as reduction. in above reaction, removal of one oxygen atom from oxygen molecule with addition of two hydrogen atoms gives water

The oxidation number of carbon in acetylene is -2.

The oxidation number of carbon in carbon-dioxide= +4

Oxidation number of carbon increases after the reaction which means that carbon is getting oxidized.

The oxidation number of oxygen in oxygen gas = 0

The oxidation number of oxygen in water = -2

Oxidation number of oxygen decreases after the reaction which means that oxygen is getting reduced.

The electrons released during oxidation are transferred to the species which are undergoing reduction reaction.

Answer:

Just put this, or something like it:

The oxidation number of carbon changes from -1 to +4.

The oxidation number of oxygen changes from 0 to -2.

Carbon is oxidized.

Oxygen is reduced.

Electrons are transferred from carbon to oxygen.

Explanation:

The  most probable speed is \(V_{mp}=401m/s\) and fraction of particles is f(\(V_{mp}\))=\(2.46 \times 10^{-21}\)

To understand the roots of the ideal gas laws, one must understand the kinetic molecular theory of gases. According to the kinetic molecular theory, gaseous particles are always moving randomly; each particle moves at a different speed while interacting with other particles and changing directions. The speed that reveals the highest amount of gas molecules moving at a given time is the one that is considered to be the most likely. The greatest value on the Maxwell's distribution map represents the speed that is most likely. The most probable speed is calculated by multiplying the total number of molecules by the sum of their individual speeds. The square root of the average velocity-squared of the molecules in a gas is what is known as the root-mean-square speed, which is used to determine how fast particles in a gas are moving.

for oxygen gas at T=310K

Mass of oxygen ,m= \(mass=\frac{32g/mol}{6.022\times10^{23} \:(molecules/mol)}\)

Mass of oxygen =\(53.1 \times 10^{-24} \:(g/molecules)\)

Mass of oxygen =\(53.1 \times 10^{-24} \:(g/molecules)(\frac{1Kg}{10^3g} )\)

Mass of oxygen =\(53.1 \times 10^{-27} Kg\)

\(V_{mp}=\sqrt\frac{2(1.38\times10^{-23})(310K)}{53.1\times 10^{-27} Kg}\)

\(V_{mp}=401m/s\)

f(\(V_{mp}\))=\(\frac{196}{e^{49} \sqrt{\pi} V_{mp}}\)

f(\(V_{mp}\))= \(\frac{196}{e^{49} \sqrt{\pi}\times 401}\)

f(\(V_{mp}\))=\(2.46 \times 10^{-21}\)

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The ratio of the acidic form of serine to the basic form of serine can be expressed using the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where pKa is the dissociation constant of serine (which is around 2.2), [A-] is the concentration of the basic form of serine, and [HA] is the concentration of the acidic form of serine.

Assuming that the total concentration of serine is 1.0 (i.e., [A-] + [HA] = 1.0), we can set up the following equation:

60 = [A-]/[HA]

or

[A-] = 60[HA]

Substituting this expression for [A-] into the Henderson-Hasselbalch equation, we get:

pH = 2.2 + log(60[HA]/[HA]) = 2.2 + log(60) = 4.8

Therefore, the pH of the solution where the ratio of the acidic form of serine to the basic form of serine is 60.0 is approximately 4.8.

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Speed

Explanation:

The distance travelled by a body per unit time

Combined gas law states that when the number of moles of an ideal gas are held constant, the volume and pressure of the gas are inversely proportional while being directly proportional to temperature.

Under combined gas law, the three (3) main gas laws are combined together and these include:

Mathematically, the combined gas law is given by the formula:

\(\frac{PV}{T} =k\\\\\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\)

Where:

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The word equation for the reaction of lithium with water is:

Lithium + Water → Lithium hydroxide + Hydrogen

The pH of water changes due to the solution being basic because of the dissolved hydroxide.

Due to its lower density than water, lithium floats on the surface while fizzing and emitting hydrogen gas. It gradually transforms into a colorless solution of lithium hydroxide and disintegrates.

In this reaction, 2 moles of Li react with 2 moles of water to form 2 moles of LiOH and 1 mole of hydrogen gas.

Therefore, the correct equation is

2Li + 2H₂O→ 2LiOH + H₂

As, before the pH of water is nearly neutral but with the formation of lithium hydroxide which is a strong base the pH changes to basic.

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Answer:

A box

Explanation:

In quantum mechanics, the atom is metaphorically described as a box. In fact, the Schrödinger wave equation is based on the three dimensional box metaphor of the atom.

Thus, a box provides a convenient treatment of the atom as it represents the fundamental components of the problem of atomic structure, hence the answer.

C. A box

Thus, the correct option is C.

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(a)  it would take 23.1 kJ of heat energy to raise the temperature of a 1000.0 g copper pot by 60.0°C.

(b) it would take 26.9 kJ  of heat energy to raise the temperature of a 1000.0 g iron pot by 60.0°C.

The specific heat capacity of copper is 0.385 J/g·°C.

To calculate the amount of heat energy required to raise a 1000.0 g copper pot by 60.0°C, we can use the formula:

Q = m × c × ΔT

where;

Plugging in the values, we get:

Q = 1000.0 g × 0.385 J/g·°C × 60.0°C

Q = 23,100 J or 23.1 kJ

The specific heat capacity of iron is 0.449 J/g·°C.

Using the same formula as before, we can calculate the amount of heat energy required to raise a 1000.0 g iron pot by 60.0°C:

Q = 1000.0 g × 0.449 J/g·°C × 60.0°C

Q = 26,940 J or 26.9 kJ

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Answer

50 N

Explanation

Answer:

112.18 g.

Explanation:

you're using stoichiometry to find the mass of the compound S₃O.

Answer:

Carbon and phosphorus

Explanation:

The atoms of carbon and phosphorus are most likely to gain electrons from the given choices .

The reason for this is because, both carbon and phosphorus are non-metals. Most non-metals usually accept electrons.

Metals are usually electron donors .

Considering the definition of alkanes, single bonds are found in an alkane.

Alkanes are a class of hydrocarbons (compounds containing only carbon and hydrogen) that are made up of a variable number of carbon atoms joined together by single bonds. In turn, each carbon atom bonds to hydrogen atoms, which may eventually be replaced by other atoms or functional groups.

In other words, alkanes are open or closed chain molecules that are linked by simple bonds.

Alkanes are saturated hydrocarbons because the bonds between carbon atoms are simple and stable. And as mentioned, the hydrogen atoms bonded to each carbon atom can be replaced by other atoms, such as halogens (fluorine, bromine, chlorine) or various groups or “radicals”. In the latter case, the structure becomes more complex giving rise to branched alkanes.

In summary, single bonds are found in an alkane.

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Answer: C) single only

Explanation:

just got it right

Answer:

file link http/www.openfree

the pOH of a 0.0085 M KOH solution is 10.48.The term pOH is used in chemistry to describe the acidity or alkalinity of a solution.

The pOH of a 0.0085 M KOH solution is 10.48. The pOH of a solution is defined as the negative logarithm of its hydroxide ion concentration. The pOH of a solution may be calculated using the following formula:pOH=-log[OH-]In which [OH-] represents the hydroxide ion concentration.

A low pOH value indicates a high hydroxide ion concentration and a basic solution, while a high pOH value indicates a low hydroxide ion concentration and an acidic solution. KOH is a strong base, and it dissociates completely in water to form hydroxide ions (OH-).

Therefore, in a 0.0085 M KOH solution, the hydroxide ion concentration ([OH-]) is also 0.0085 M. The pOH of this solution can be calculated using the pOH formula:pOH=-log[OH-]pOH=-log(0.0085)pOH=10.48.

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Answer:

1s22s22p32d6

Explanation:

is a reasonable electron configuration