The autoionization of water is a reversible reaction.

2H₂O ⇌ H3O⁺ + OH⁻

This reaction is endothermic (ΔH is positive).

What is the effect of increasing temperature of water on:

The numerical value of Kw

Answer 1
Choose...
pH

Answer 2
Choose...
[H3O+ ]

Any object which have less density than the mercury will float in it and which have higher density will sink on it. Here, gold has higher density than  mercury. Thus it will sink on mercury.

Density of a substance is the measure of its mass per volume. Thus it says about how much denser the substance is in a specific volume. The ratio of density of an object to the density of  water is called specific gravity.

The density of mercury is 13.4 g/ml. Any object which is less dense than mercury will float on its surface whereas, objects which have higher density than mercury will sink on it.

The density of gold is 79.3 g/ml. All other given metals iron, lead and copper have a density less than that of mercury. Hence the substance which sink on mercury is gold. Option Dis correct.

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The mole fraction must be known in order to determine the partial pressure of h2.

What is molar fraction?

The amount of a component, ni, expressed in moles, divided by the sum of all the components, ntot, likewise stated in moles, is known as the mole fraction or molar fraction (xi or I).

Below is an example of this phrase:

xi=ni/ntot

What is partial pressure?

If a container is filled with multiple gases, each gas will exert pressure, which is known as partial pressure. Its partial pressure is the pressure of any gas contained within the container.

Using this mole fraction formula:

=Xa/Xa+Xb+Xc

=XH2/XH2+XN2+Xo2

=1/3

=1/3×2=2/3

The partial pressure of h2 is 2/3

Therefore, the partial pressure of h2 is 2/3.

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Natural abundance indicates the following percentage of the natural occurrence of an isotope of an element on the planet.

Natural abundance is defined as the relative amount of the isotopes of an element which occurs in nature. It is also known as geonormal abundance.

The formula to calculate the natural abundance of an element with two isotopes is given as :

x + (1 - x) = 1

Where,

x represents the fractional value of isotope-1 and 1 - x represents the fractional value of isotope-2.

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Answer:

Calcium Hydroxide is more soluble in water

Explanation:

Calcium Hydroxide is more soluble in water as all group 2 carbonates are not very soluble while Group 2 hydroxides are moderately soluble.

The reaction of acetic acid and calcium hydroxide is an example for double displacement reaction. The balanced equation can be written as,

2 HC2H3O2 (aq) + Ca(OH)2 (aq) ----------> Ca(C2H3O2)2 (aq) + H2O (l)

What is double displacement reaction?

The double displacement reaction is a type of reaction in which the cations and anions of the reacting species exchange with each other to form  two new compounds.

In the reaction of acetic acid and calcium hydroxide the cationic part of calcium hydroxide reacts with anionic part of acetic acid to give calcium acetate and the anionic part of calcium hydroxide reacts with cationic part of acetic acid to give water. This type of reaction between acetic acid and calcium hydroxide is called double displacement reaction.

Therefore, the balanced equation for double displacement reaction of acetic acid and calcium hydroxide can be written as,

2 HC2H3O2 (Aq) + Ca(OH)2 (aq) ---------> Ca(C2H3O2)2 (aq) + H2O (l)

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Answer:  They speed up and move farther apart.

Explanation:  With an increase in temperature, the particles move faster as they gain kinetic energy, resulting in increased collision rates. The volume increases as they start moving apart from each other.

Methane (CH4) is a hydrocarbon that is mostly found in natural gas and has a molecular weight of 4.051747moles per 65.0 grams.

Methane concentrations above a certain threshold can affect how much oxygen is breathed in. This can include headaches, face flushing, memory loss, vision issues, slurred speech, mood swings, nausea, and vomiting. Serious cases could result in altered breathing and heart rate, balance issues, numbness, and coma.

The gas methane (CH4) is colorless, odorless, and very combustible. Carbon and hydrogen are its main ingredients. According to us Environmental Protection Agency, it is also a powerful greenhouse gas, meaning means it influences climate change by causing more warming.

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Knowing the heat capacity of the water, we know that  the heat absorbed is  1.83 * 10^4 J.

We know that water can be able to absorb heat when it is heated and the heat that is absorbed can be able to change the state of the water. We are now going to see how we can be able to obtain the heat that is absorbed by the water.

Then;

H = mcdT

H = heat absorbed

m = mass of the water

c = heat capacity of water

dT = temperature change

Given that mass of the water = 59.5 g we can write;

H = 59.5 g * 4.18 * (100 ∘C - 26.5 ∘C)

H = 1.83 * 10^4 J

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Answer:

A

Explanation:

Independent variable: the surface of the slope rug, bubble wrap and wood

For this experiment, various solutions were compared to look for precipitation or bubbling. The precipitates or bubbles are the independent variable in the experiment. Therefore, option B is correct.

The term precipitation is defined as a solid produced by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid.

A substance separated from a solution or suspension by chemical or physical change, usually as an insoluble amorphous or crystalline solid.

A compound may precipitate when its concentration exceeds its solubility. This can be caused by temperature changes, solvent evaporation, or solvent mixing. A strongly supersaturated solution precipitates more quickly.

Independent variable are the surface of the slope rug, bubble wrap and wood.

Thus, option B is correct.

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The temperature of the silver will decrease by -828.7 °C

if it loses 982 J of heat energy

From calorimetry, we understood that heat released or lost is given by:

Q = MCΔT

Where

With the above formula, we can determine the temperature change of the silver. This is illustrated below

Q = MCΔT

-982 = 5 × 0.237 × ΔT

-982 = 1.185 × ΔT

Divide both side by 1.185

ΔT = -982 / 1.185

ΔT = -828.7 °C

Thus, the temperature will decrease by -828.7 °C

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Answer:

c. a reaction in which oxidation numbers change

Explanation:

In an oxidation reaction there is loss of electrons whereas in a reduction reaction there is gain of electrons. Therefore, a reaction in which oxidation numbers change identifies an oxidation-reduction reaction.

Answer:

C: a reaction in which oxidation numbers change.

Explanation:

[tex]-6.66^{0} C[/tex][tex]-30.4^{0} C[/tex]Between the two options, the option A shows the colder temperature, that is [tex]-30^{o}[/tex] F.

Both Fahrenheit and Celsius employ different temperatures as the water's freezing and boiling points, as well as differing sizes for their degrees. While water freezes at zero degrees Celsius and boils at one hundred degrees C, it does so at 32 degrees Fahrenheit and two hundred and twenty degrees F, respectively. You can see that although Fahrenheit has 180 ° between the freezing and boiling extremes, Celsius has 100 degrees. The difference between one degree Celsius and one degree Fahrenheit is 1.8.

On converting [tex]-30^{o}[/tex] F to Celsius we get, [tex]-30.4^{0} C[/tex]

and on converting [tex]20^{o} F[/tex] to Celsius, we get, [tex]-6.66^{0} C[/tex]

Hence, we can say [tex]-30.4^{0} C[/tex] is colder temperature than [tex]-6.66^{0} C[/tex].

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The given reaction is an example of nuclear fusion.

This is because two lighter hydrogen atoms fuse to give a heavier helium atom. There is also an increase in the atomic number of the product.

Nuclear fission reactions are reactions in which the nucleus of large atoms are split into nucleus of two or more smaller atoms.

For example, uranium atoms split into krypton and barium.

Nuclear fusion reactions involve the nucleus of two or more smaller atoms combining to give an atom of a larger nucleus.

For example, hydrogen atoms fuse to give a helium atom.

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Atom consists of electron, proton and neutron.  The number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.

Mass number =Number of neutrons+ number of protons

Mass number =55

Number of neutrons=atomic number+5

Substituting the given values in the above formula

55 =atomic number+5+ number of protons

50=2×atomic number

Atomic number=25

Therefore, the number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

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Answer:

13.89

Explanation:

13.89 moles (mole =mass)

Answer:

A.) 14.75 mol

Explanation:

To find the amount of moles, you need to use the Ideal Gas Law equation:

PV = nRT

In this equation,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = number of moles

-----> R = Ideal Gas Constant (0.08206 L*atm/K*mol)

-----> T = temperature (K)

You can plug the given values and the constant into the equation and simplify to find "n".

P = 10 atm                    R = 0.08206 L*atm/K*mol

V = 27 L                       T = 223 K

n = ? moles

PV = nRT                                                                   <----- Ideal Gas Law

(10 atm)(27 L) = n(0.08206 L*atm/K*mol)(223 K)   <----- Insert variables

270 atm*L = n(18.299 L*atm/mol)                           <----- Mutliply

14.75 mol = n                                               <----- Divide both sides by 18.299

The volume of the solution is obtained as 414 mL.

Often times, we want to  reduce the concentration of a solution and the way that we can be able to do that is by the process of dilution. When we say dilution what it means is that we are going to increase the volume of the solution.

In this case;

C1 = initial concentration

V1 = initial volume'

C2 = final concentration

V2 = final volume

Then;

C1V1 = C2V2

V1 = C2V2/C1

=  7.77 M * 842 mL/ 15.8 M

= 414 mL

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The molecular structure of C4H6 rigid is Not rigid.

The Schrödinger equation, a quantum mechanical equation for the motion of electrons in the field of nuclei, can theoretically be used to identify the molecule structure. The bond lengths and bond angles in a molecular structure are those where the molecular energy is lowest. The numerical solution of the Schrödinger equation to determine structures has developed into a highly developed technique requiring the use of computers and supercomputers.

Either either neutron diffraction or microwave vibration-rotation spectra are used to determine the nuclear locations within a molecule. X-ray diffraction investigations can be used to analyse the electron cloud that surrounds a molecule's nucleus.

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One kilopascal of pressure is 0.01 bar pressure. Thus 494 kilopascal pressure is 4.94 bar pressure.

Pressure is an intensive quantity measuring the force produced on body by a mechanical stress. Pressure of a substances is inversely proportional to the volume and directly proportional to the temperature.

Pressure of a substance can be expressed in different units where, the SI unit is atm or atmospheric pressure. Other units are bar, pascal, kilopascal etc.

One kilopascal pressure = 0.01 bar. Hence, 494 kilopascal is:

(494 Kpa × 0.01 bar) / 1 kpa = 4.94 bar.

Hence, 494 Kpa pressure is 4.94 bar.

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The equilibrium constant expression for the given reaction of methane with hydrogen sulfide will be:

[tex]k_c = \frac{[CS_2][H_2]^4}{[CH_4][H_2S]^2}[/tex]

Equilibrium constant expression is a ratio of the concentration of products to that of the concentration of the reactants. It is given by k[tex]_c[/tex].

In the given reaction, the product of the concentration of the reactants is

[tex]k_r[/tex] = [tex][CH_4] [H_2S]^2[/tex]

while the product of the concentration of the products is

[tex]k_p[/tex] = [tex][CS_2][/tex] [tex][H_2]^4[/tex]

According to the definition,

[tex]k_c = \frac{k_p}{k_r}[/tex]

[tex]\therefore k_c = \frac{[CS_2][H_2]^4}{[CH_4][H_2S]^2}[/tex]

Thus, the equilibrium constant expression is the ratio of the concentration of products and reactants.

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The most likely way in which an atom of magnesium (Mg) will satisfy the octet rule when it forms bonds is by losing two electrons.

The octet rule is described as a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

The octet rule is held responsible for the relative inertness of the noble gases and the chemical behavior of certain other elements.

Magnesium (Mg) will satisfy the octet rule when it forms bonds is by losing two electrons.

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Answer:

by losing two electrons

Explanation:

I got it right on edge 2023

good luck

Since carbohydrates are essential biomolecules the action of sugars fluctuates when enzymes consume substrates of glucose molecules.

Gas pressure is the pressure created by the collision of gas particles with an object. Inside the balloon, gas particles collide with the inner wall of the balloon. It's these collisions that keep the balloon inflated. When carbon dioxide gas fills the balloon, it inflates. The more gas produced, the bigger the balloon will inflate.

The chemical reaction between baking soda and vinegar will inflate the balloon as long as the baking soda and vinegar react. Force Balance: The pressure inside the inflated balloon is greater than the pressure outside. The balloon is stable because the expansion force due to the pressure difference balances the contraction force due to the surface tension of the rubber.

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A Mole should not be considered a base unit in the SI system.

SI system is a metric system which is also known as the International system of units. Most of the measurements across the globe is measured by SI system. SI units are used in nearly every part of the globe, such as science, technology, mathematics and many more. The system includes coherent units known as derived units.

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Answer:21.0 mL

shorten math

The specific kind of potential energy does pemican have of dietary calories is chemical potential energy.

What is potential energy?

potential energy, stored in energy that depends upon  to the relative position of the  various parts of a system. A spring has more potential energy when it is the  compressed or stretched.

Sol-Chemical energy is simply energy that is stored to in compounds or elementary are  specifically in the atomic bonds that connect atoms and the  molecules. In food, it is  a form of potential energy id  because it's stores away.

The type of potential energy is  that exists within chemical bonds, and it is  released when of  those bonds are broken, is called chemical energy. Chemical energy is the  responsible for providing is  living cells with energy from food. The release of energy occurs in  when the molecular bonds are within food molecules are broken.

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Answer:

0.5 7.0 there is so many results

Explanation:

its very simple

The area of human activity that consumes the most energy is building construction and operation. Option B.

Humans impact the physical environment in many ways including overpopulation pollution burning fossil fuels and deforestation. Such changes are causing climate change soil erosion declining air quality and undrinkable water. Human geography includes the study of all human activities and their effects on the natural environment.

The impact of early human societies on the natural environment was minimal due to the presence of a small number of nomads, mainly through hunting, fishing, and gathering. The human activity system is a fictitious system that represents goal-oriented human activity. These systems are fictitious in the sense that they are intelligent constructs and do not describe actual real-world activities.

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Answer:

it will be all water and it needs to cool of

Answer:

Octane can be written as C8H18.

The balanced equation for combustion of octane is:

2C8H18 + 25 O2 ==> 16CO2 + 18H2O

Finding the limiting reactant:

10.g C8H18 x 1 mol C8H18 / 118 g = 0.0847 moles (÷2->0.042)

61.2 g O2 x 1 mol O2 / 32 g = 1.91 moles (÷25->0.077)

C8H18 is the limiting reactant and will dictate the maximum amount of H2O that can form.

Maximum H2O formed:

0.0847 moles C8H18 x 18 moles H2O / 2 moles C8H18 x 18 g H2O/mol = 14 g H2O formed (2 sig.figs.)

Explanation:

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