What are the two processes underlying this image that turn peat into coal

Answer:

theory

If it has been tested enough, then it can be considered a scientific theory.

Answer:

The modern model recognizes particles in the atom, whereas Dalton’s model does not.

Explanation:

The modern model considers the atom to consist of electrons, protons, and neutrons.

A is wrong. The modern model of the atom is widely accepted.

B is wrong. Dalton assumed that all atoms are identical. The modern model recognizes that there are isotopes of atoms.

D is wrong. The modern model explains emission spectra. Dalton's model does not.

Answer:

C. The modern model recognizes particles in the atom, whereas Dalton’s model does not.

Explanation:

IM JUST HIM

Answer:

It has a different value at different temperatures.

Explanation:

For any system in equilibrium, the molar concentration of all the species on the right hand side are related to the molar concentrations of those at the left side by a constant known as the equilibrium constant.

The equilibrium is a constant at a given temperature as it is temperature dependent.

A change in temperature of an equilibrium system shifts the system to a new equilibrium point. A rise in temperature actually shifts equilibrium position to the direction that absorbs heat and vice versa.

The shift in equilibrium as a result of temperature change is actually a change in the value of the equilibrium constant. Equilibrium constant is represented as [tex]K_{eq}[/tex]

The derivation of the equilibrium constant is based on the Law of Mass Action which states: the rate of a chemical reaction is proportional to the product of the concentrations of the reacting substances.

Answer:

It has a different value at different temperatures.

Explanation:

I took the test, and this answer was correct

You can use this formula to help:

[tex]c = \frac{q}{m \: \times \: change \: in \: t} [/tex]

Where:

C = specific heat

q = heat

m = mass

t = temperature

What we know:

C = unknown

q = 956 J

m = 45 g

change in t = 12°C because 37°C - 25°C = 12°C

Plug known values into the formula:

C = 956 J / (45 g) (12°C) and we are left with a specific heat of 1.77J/g°C

Now, convert Joules to calories and then you get:

Answer: A. 0.423 cal/g°C

If the temperature of the alloy is 37°C, 0.423 cal/g°C.  is its specific heat. The correct answer is A.

To find the specific heat of the alloy, we can use the formula:

Q = mcΔT

where:

Q = heat absorbed (in joules)

m = mass of the alloy (in grams)

c = specific heat of the alloy (in cal/g°C)

ΔT = change in temperature (in °C)

We are given Q = 956 J, m = 45 g, ΔT = (37°C - 25°C) = 12°C. Now, we need to convert the heat and temperature from joules to calories:

1 cal = 4.184 J

Q = 956 J * (1 cal / 4.184 J) = 228.74 cal

Now, we can rearrange the formula to solve for c:

c = Q / (m * ΔT) = 228.74 cal / (45 g * 12°C) ≈ 0.423 cal/g°C

Therefore, the correct answer is A. 0.423 cal/g°C.

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The bond formed here would be a covalent bond.

This is because not only are the two molecules (Chlorine) listed nonmetals, but they also have identical electronegativity values. (Both have 7 electrons.)

Hope I could help! :)

Answer:

[tex]\boxed{\text{Chemical; physical; chemical}}[/tex]

Explanation:

Tarnish ing

Tarnishing is a chemical property.

One substance changes into another substance with different properties. For example, the tarnish on silverware is formed by the reaction of silver with hydrogen sulfite to form black silver sulfide.

2Ag + H₂S ⟶ Ag₂S + H₂

Freezing

Freezing is a physical property, because the composition of the substance does not change. After liquid water has frozen to ice, it is still water, but in the solid state.

H₂O(ℓ) ⇌ H₂O(s)

Rusting

Rusting is a chemical property, because a new substance with different properties is formed.

A simple equation for the formation of rust is

2 Fe + 3O₂ + H₂O ⟶ Fe₂O₃·H₂O

Answer:

1.  C. helium

2.  D. oxygen and acetylene

3.  B.  deliquescence

4.  C.  cutting very hard surfaces

5.  B.  3.5%

Explanation:

Answer:

2.56 L NiCl2

Explanation:

This is a stoichiometry problem. You need to find a way to go from g of Ni3(PO4)2 to L of NiCl2. To do this you travel

mass Ni3(PO4)2 > moles Ni3(PO4)2 > moles NiCl2 > L NiCl2

so you need to know the key that lets you travel from one to the next.

Mass > moles, use molar mass

moles > moles, use the mole ratio

moles > L, use the molarity (moles / liter) in this case. (With gases, you use the STP gas volume of 22.4L / mole).

The attached picture shows what this problem looks like.

The problem requires application of stoichiometry using a balanced chemical equation. About 2.51 L of 0.219 M NiCl2 solution is needed to produce 68.4 g of Ni3(PO4)2 precipitate.

The subject of the problem concerns stoichiometry in chemistry. Specifically, the use of a balanced chemical equation to calculate volumes of a solution needed, in this case - 0.219M of NiCl2 solution required to produce 68.4g of Ni3(PO4)2 precipitate.

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Answer: HBr & HF are correct on edmentum/ plato

Explanation:

All acids that start with the prefix "hydro" are also called binary acids. HCl containing anionic chloride is called hydrochloric acid. HCN containing hydrogen cyanide is called hydrocyanic acid

H2SO3 is not sulfite. Description: Acids containing non-metal elements other than hydrogen and oxygen are called hydrogen acids. Examples: HCl, HBr, HI.

A diprotic acid is an acid composed of hydrogen and one other element. The most common diprotic acids contain halogens. Acid names start with the prefix hydro-.

Acid has its own nomenclature. If the acid is composed of only hydrogen and one other element, its name is water- + stem of another element + -acid. For example, the compound HCl (aq) is hydrochloric acid, while H2S (aq) is hydrogen sulfide.

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Answer:

0.24  moles.

Explanation:

number of moles  = mass of sample /mass of 1 mole

9.8g /40.08g  = 0.2445  moles <3

Answer:

2.5 moles of O₂

Explanation:

2RbNO₃⇒2RbNO₂+O₂-------------The equation is balanced

Mole ratio for the equation

2RbNO₃⇒2RbNO₂+O₂

2                2              1

RbNO₃:O

2:1---------------------------------------For every mole of oxygen produced ,two moles of RbNO₃ are required

Given

5 moles of RbNO₃  will produce ? moles of oxygen

2 moles of RbNO₃=1 mole of oxygen

5 moles of RbNO₃=?

=(5×1)/2 = 2.5 moles

Answer:

Q14: 17,140 g = 17.14 kg.

Q16: 504 J.

Explanation:

Q14:

Q = m.c.ΔT,

where, Q is the amount of heat absorbed by ice (Q = 3600 x 10³ J).

m is the mass of the ice (m = ??? g).

c is the specific heat of the ice (c of ice = 2.1 J/g.°C).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 100.0°C - 0.0°C = 100.0°C).

∵ Q = m.c.ΔT

∴ (3600 x 10³ J) = m.(2.1 J/g.°C).(100.0°C)

∴ m = (3600 x 10³ J)/(2.1 J/g.°C).(100.0°C) = 17,140 g = 17.14 kg.

Q16:

Q = m.c.ΔT,

where, Q is the amount of heat absorbed by ice (Q = ??? J).

m is the mass of the ice (m = 12.0 g).

c is the specific heat of the ice (c of ice = 2.1 J/g.°C).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 0.0°C - (-20.0°C) = 20.0°C).

∴ Q = m.c.ΔT = (12.0 g)(2.1 J/g.°C)(20.0°C) = 504 J.

Answer:

Hcl

Explanation:

Arrhenius acid - produce H+

Arrhenius base - produce oh -

we can see here in the option B give us H+ which is arrhenius acid

HCl  is an Arrhenius acid. Hence, option B is correct.

According to Arrhenius's theory, acid is a substance that gives[tex]H^+[/tex] ion on dissolving in the aqueous solution.

It increases the concentration of [tex]H^+[/tex] ions in the solution.

The base is a substance that ionizes[tex]OH^-[/tex] ions by dissolving in the aqueous solution.

Arrhenius acid - produce [tex]H^+[/tex]

Arrhenius base - produce [tex]OH^-[/tex]

Hence, option B is correct.

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Nonrenewable resources are those found inside the earth, and they took millions of years to form. These include the fossil fuels, oil, natural gas, and coal and nuclear energy

Answer:

volume, pressure, moles of air molecules

Explanation:

The volume, Pressure and Moles of air molecules expect to change when you compare the starting and ending state of the tire.

So, option A , C and D is correct option.

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Final answer:

To determine the concentration of NaOH in a solution, you can use titrants such as Hydrochloric acid (HCl), Sulfuric acid (H2SO4), or Potassium hydrogen phthalate (KHP) through the titration process.

Explanation:

In order to determine the concentration of NaOH in a solution, you can use a process called titration with a titrant. Three possible titrant solutions that can be used to titrate an NaOH solution include:

Each of these substances can act as an acid to neutralize the basic NaOH solution, and through the process of titration, you can determine the exact concentration of NaOH presented in the solution.

answer:

temperature

pressure

volume

concentration of amount of reactants and product

Answer:

A space station

Explanation:

A space station provides an avenue for scientist to orbit the space and carryout scientific findings. Most space stations are usually controlled under agreement between different countries. The international space station is one such example.

A rover is usually a robotic device that has been pre-programmed and equipped with state of the art devices to carryout explorations on their own.

Most space observations are usually powerful telescopes on the earth surface that monitors events in space.

A satellite is a body that orbits another.

Answer:

space station

Explanation:

A gas deviates most from the ideal gas law at low temperatures and high pressures due to the increased significance of molecule volume and intermolecular attractions.

A gas will be least likely to exhibit the ideal gas properties predicted by the ideal gas law under conditions of low temperatures and very high pressures. At high pressures, gas molecules are forced closer together, which means they occupy a more significant volume relative to the space they are in, challenging the assumption that their volume is negligible. At low temperatures, the decreased kinetic energy of the gas particles means that intermolecular attractions become more significant, further deviating from ideal behavior.

Answer:

Brick.

Explanation:

The formula for the amount of heat absorbed by an object is

q = mCΔT

You want to know how much ΔT changes for each object.

[tex]\Delta T=\dfrac{q}{mC}[/tex]

If each object has the same mass and absorbs the same amount of heat, then

[tex]\Delta T \propto \dfrac{1}{C}[/tex]

The object with the smallest specific heat capacity should have the greatest temperature increase.

Brick will have the greatest temperature increase (we can't say how fast the objects will heat up, because that depends on thermal conductivity: how quickly the heat is carried to the interior of the object).  

Answer: Brick

Explanation:

Because any number is the lowest in this question it would be brick

Answer:

Here's what I get.

Explanation:

Two factors:

1. Higher accelerating voltages

Both types use a beam of accelerated electrons as a source of illumination.

Resolution depends on the wavelength of the electron beam. The shorter the wavelength, the smaller the objects you can "see."

SEMs usually use acceleration voltages up to 30 kV, while TEMs can set them as high 300 kV. Thus, the electron wavelengths in TEMs are shorter by a factor of 10.

2. Less spherical aberration

Spherical aberration degrades the quality of the image. It decreases as wavelength decreases, so you can push the magnification higher with a TEM without losing image quality.

Answer:

idfk

Explanation:

Answer:

The reaction will be spontaneous.

Explanation:

If ΔG is negative, the reaction is spontaneous.  

If ΔG = zero, the reaction is at equilibrium.

If ΔG is positive, the reaction is non-spontaneous.

Answer: The Answer is Yes! at least on odyssey ware

Explanation: I Know this is right because I was right and got a solid 100% on it. So there is the answer for yall legends!

Answer:

Cl₂ is the limiting reactant.

Explanation:

2Na + Cl₂ → 2NaCl,

It is clear that 2 mol of Na react with 1 mol of Cl₂ to produce 2 mol of NaCl.

For Na:

n = mass/molar mass = (8.0 g)/(22.989 g/mol) = 0.348 mol.

For Cl₂:

n = mass/molar mass = (8.0 g)/(70.9 g/mol) = 0.113 mol.

The limiting reagent in a chemical reaction is the substance that is totally consumed when the chemical reaction is complete. The amount of product formed is limited by this reagent, since the reaction cannot continue without it.

So, 0.113 mol of Cl₂ react completely with 0.226 mol of Na which be in excess (0.384 - 0.226 = 0.158 mol).

So, the limiting reactant is Cl₂ which is the reactant has the lowest molar ratio.

Diatomic chlorine (Cl₂) is the limiting reactant for the reaction between 8 g of sodium and 8 g of diatomic chlorine.

The limiting reactant in a chemical reaction is simply defined as the reactant which is completely used up in the chemical reaction.

With the above information in mind, we can determine the limiting reactant for the reaction between 8 g of sodium and 8 g of diatomic chlorine (Cl₂). This can be obtained as follow:

2Na + Cl₂ —> 2NaCl

Molar mass of Na = 23 g/mol

Mass of Na from the balanced equation = 2 × 23 = 46 g

Molar mass of Cl₂ = 35.5 × 2 = 71 g/mol

Mass of Cl₂ from the balanced equation = 1 × 71 = 71 g

From the balanced equation above,

46 g of Na reacted with 71 g of Cl₂

Therefore,

8 g of Na will react with = [tex]\frac{8 * 71}{46}\\\\[/tex] = 12.3 g of Cl₂

From the calculation made above, we can see clearly that a higher mass of Cl₂ (i.e 12.3 g) than what was given (i.e 8 g) is needed to react completely with 8 g of Na.

Therefore, Cl₂ is the limiting reactant and Na is the excess reactant.

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Answer:

   1.93 x 10²⁴molecules

Explanation:

Given parameters:

Number of moles of CO₂ = 3.2 moles

To find the number of molecules of CO₂ in 3.2 moles, we simply use the expression below :

       Number of particles = number of moles x 6.02 x 10²³

The above equation relates the number of particles such as molecules, atoms, protons, electrons to the number of moles.

A mole can be defined as the amount of substance contained in the avogadro's number of particles(6.02 x 10²³)

Number of particles = 3.2 x 6.02 x 10²³ = 19.264 x 10²³ =

                                         1.93 x 10²⁴molecules

In 3.2 moles of CO₂, there are approximately 1.92624 × 10²⁴ molecules.

The number of molecules of carbon dioxide in 3.2 moles can be calculated by using Avogadro's number. Avogadro's number is 6.022 × 10²³ molecules per mole.

Therefore, in 3.2 moles of CO₂, there are 3.2 x 6.022 × 10²³ = 1.92624 × 10²⁴ molecules of CO₂.

Answer:

grease fire. The others are solids that will easily be put out with water.

Answer:

grease fire

Explanation:

DOING THAT WILL JUST MAKE IT WORSE

hope it helps

Answer:

148.1 mL.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R  is the general gas constant,

T is the temperature of the gas in K.

(V₁T₂) = (V₂T₁)

V₁ = 125 mL, T₁ = 25°C + 273 = 298 K,

V₂ = ??? mL, T₂ = 55°C + 273 = 353 K,

(V₁T₂) = (V₂T₁)

∴ V₂ = (V₁T₂)/(T₁) = (125 mL)(353 K)/(298 K) = 148.1 mL.

Answer:

Cross-pollination

Explanation:

This technique is used to create new varieties, usually with stronger characteristics than the two original varieties. When the pollen of one variety is placed to a different plant's stigma, the resulting seeds create a new variety. This cross-pollination is used in plants of the same species.  

Answer:

Crossbreeding

Explanation:

apex

Answer:

1st answer:  A. nitrogen

2nd answer:  A. Sodium carbonate

Explanation:

The gas usually filled in the electric bulb is

OPTION A

Washing soda is the common name for

OPTION A

Answer:

Explanation:

The given reaction equation is:

                2A + 4B → C + 3D

We know the mass of compound A in the reaction above. We are to find the mass of compound D.

We simply work from the known mass to calculate the mass of the unkown compound D

Using the mole concept, we can find the unknown mass.

Procedures

            Number of moles of A = [tex]\frac{mass of A}{molar mass of A}[/tex]

           From the balanced equation of the reaction, it is shown that:

         2 moles of compound A was used up to produced 3 moles of D

  Then [tex]\frac{3}{2}[/tex] x number of moles of A would give the number of moles of D

             Mass of D = number of moles of D x molar mass of D