When Fe2O3(s) reacts with H2(g) to form Fe(s) and H2O(g), 98.8 kJ of energy are absorbed for each mole of Fe2O3(s) that reacts. Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation. Note that the answer box for the energy term is case sensitive. Use the SMALLEST INTEGER coefficients possible and put the energy term in the last box on the appropriate side of the equation. If a box is not needed, leave it blank.

Answer:

yes,its true

Explanation:

I just want to say first off

the immune cell known as T cell also known as white blood cells

Since the first main attack from the bodies response against a virus is deploying T cells to attack

CD4 cells are the basic T cells and HIV virus which is AIDS will start to "Eat itself inside" Ofc not they will use protein spikes to form their way in

they start to create copies of themselves inside the T cell itself and creating a new protein called Env to form their ways in ofc

They are able to bypass CD4 cells is because its a basic cellular receptor for T cells making them really deadly

They now will start to attack other white cells and deploying more and more of their virus cells

Cost-effective definition: producing good results without costing a lot of money. E.g: that machine is very cost effective, it made 200 shirts with only a dollar.

Time effective definition: how well time was used. E.g that machine is very time-effective, it made 200 pants in one hour!

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Explanation:

s=2

p=6

d=10

f=14

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Based on the information, we can infer that the red line is about 3.9 cm.

To identify the measure of the red line we must look at the metric rule at the bottom. As we can see, this demarcates the centimeters and the millimeters. Based on the information, we can infer that the answer is 3.9 cm since the line extends to the line that delimits this value.

Based on the above, we can infer that the red line measures about 3.9 cm, taking the ruler as a reference.

Note: This question is incomplete. Here is the complete information:

Attached image

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Answer:

4 CO + 8 H2 -> 4 CH3OH

Hope that it works

The temperature of the oxygen gas sample is 609 K, which is approximately 336°C or 637°F. The answer is A.

We can use the ideal gas law equation, PV = nRT, to solve for the temperature of the oxygen gas sample.

First, we need to calculate the number of moles of oxygen gas present in the sample using its mass and molar mass:

n = m/M

where:

n = number of moles

m = mass (in grams)

M = molar mass (in g/mol)

The molar mass of oxygen gas (O2) is 32.00 g/mol.

n = 48 g / 32.00 g/mol = 1.50 mol

Next, we can rearrange the ideal gas law equation to solve for temperature (T):

T = (PV) / (nR)

where:

T = temperature (in Kelvin)

P = pressure (in atm)

V = volume (in liters)

n = number of moles

R = gas constant (0.0821 L atm/mol K)

Plugging in the given values, we get:

T = (3.0 atm x 25 L) / (1.50 mol x 0.0821 L atm/mol K)

T = 609 K

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Answer:

C. Lithium has more protons, neutrons, and electrons.

Answer: C. Lithium has more protons, neutrons, and electrons.

Explanation:

Mixing calcium carbonate and HCl

Heating copper sulfate pentahydrate

Mixing potassium iodide and lead nitrate

Combining magnesium and HCl

Burning the candle.

The crushing of limestone is a bodily trade it no longer alters the chemical composition of the limestone. The heating of limestone is a chemical trade the limestone decomposes into two other materials, lime and carbon dioxide. both ended in gas formation. both ended in shade change.

Rust is not anything however Iron Oxide is a brand new substance shaped out of the response. The color of the floor of the iron additionally modifications. hence, rusting of iron is a chemical trade. Rusting is an instance of chemical exchange. A chemical property describes the ability of a substance to go through a particular chemical alternate. The chemical belonging of iron is that it is miles capable of combining with oxygen to form iron oxide, the chemical call of rust. like several steel carbonates, calcium carbonate reacts with acidic solutions to supply carbon dioxide gas.

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Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

To find the standard reduction potential at 25°C for the half-reaction Ag2CrO4(s) + 2e¯ → 2Ag(s) + CrO4²-(aq), we can use the Nernst equation, which relates the standard reduction potential (E°) to the equilibrium constant (K) and the reaction quotient (Q).

The Nernst equation is given as follows:

E = E° - (RT/nF) * ln(Q)

Given information:

Ksp = 1 × 10^(-12)

E = +0.799 V (standard reduction potential of Ag+ to Ag)

Since the reaction involves the dissolution of Ag2CrO4(s), the reaction quotient Q can be expressed as [Ag+]²/[CrO4²-].

Since the stoichiometry of the reaction is 2:1 for Ag2CrO4 to Ag+, we can say that [Ag+]² = Ksp.

Therefore, Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

Please note that without specific values for temperature (T) and the ideal gas constant (R), the exact standard reduction potential at 25°C cannot be determined.

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Answer:

Theoretical yield = 49.45g

Percentage yield= 93.6%

Based on the methods used to separate the substance into its parts is substance U is a mixture because physical methods were used to separate its parts; option D.

Separation techniques are techniques employed in the separation of mixtures of substances.

Mixtures are substance made up of two or more components physically joined together.

Considering the substance which is being separated, the separation techniques employed are physical separation techniques, hence the substance is a mixture.

In conclusion, physical separation techniques are employed in the separation of mixtures.

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Answer

Ag⁺(aq) + Cl⁻ → AgCl(s)

Explanation

The balanced molecular equation of mixed AgNO3 and MgCl2 solutions is:

2AgNO₃(aq) + MgCl₂(aq) → 2AgCl(s) + Mg(NO₃)₂ (aq)

The balanced complete ionic equation for the reaction is:

2Ag⁺(aq) + 2NO₃⁻(aq) + Mg²⁺(aq) + 2Cl⁻ → 2AgCl(s) + Mg²⁺(aq) + 2NO₃⁻(aq)

NO₃⁻ ions and Mg²⁺ are spectators, remaining in the solution. Ag⁺ and Cl⁻ ions react to form a precipitate of AgCl according to this net ionic equation below.

The balanced net ionic equation is:

Ag⁺(aq) + Cl⁻ → AgCl(s)

Answer:

36.09% approximately

Explanation:

I'm not good at English so I don't know if I get it right

Answer:

Water is polar

Explanation:

Answer:

Air and sunlight

Explanation:

To make energy, a plant must get carbon, hydrogen, and oxygen atoms. The source of these atoms are water and air.

The process in which green plants use sunlight to make their own food is called photosynthesis. Plants requires sunlight, chlorophyll, water, and carbon dioxide gas as raw materials. Chlorophyll is a substance that is present in leaves of the plant and makes plants greens. It consist of the metal Magnesium.

Photosynthesis also is done by other organisms besides green plants. These include prokaryotes like cyanobacteria, purple bacteria and green sulfur bacteria. These organisms exhibit photosynthesis just like green plants. The glucose is produced in them during photosynthesis and it is then used to fuel various cellular activities. The by-product of this physio-chemical process is oxygen.

Therefore, To make energy, a plant must get carbon, hydrogen, and oxygen atoms. The source of these atoms are water and air.

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Answer:

e. oxygen is a reactant in combustion and pure oxygen increases the reactant concentration

Explanation:

The reaction of a burning match is combustion. In this combustion, the organic components of the match (such as cellulose, C₆H₁₀O₅) react with oxygen, producing water and carbon dioxide:

Seeing as oxygen is a reactant and not a catalyst nor product, and that nitrogen plays no part in the reaction, the only correct answer is option e.

Answer:

The resulting concentrations at equilibrium are:

[PCl5] = 0.168 M

[PCl3] = 0.0595 M

[Cl2] = 0.0595 M

Explanation:

The question requires us to calculate the concentrations of PCl3 and Cl2, given that 0.670 moles of PCl5 were placed in a 4.00 L container and the equilibrium constant of the following reaction is 0.0211 M:

We can solve this problem using the equilibrium constant expression, considering that the concentration of PCl3 and Cl2 at the equilibrium will be the same (note that they present the same stoichiometric coefficient).

We can write the expression for the equilibrium constant as:

Considering that [PCl3] = [Cl2] = x, we can rearrange this expression to calculate x:

The concentration of PCl5 can be obtained from the number of moles given (0.670 moles) and the volume of the container (4.00L):

Now, applying the values of K (0.0211M) and [PCl5] (0.168M) to the expression we wrote above, we'll have:

Therefore, the resulting concentrations at equilibrium are:

[PCl5] = 0.168 M

[PCl3] = 0.0595 M

[Cl2] = 0.0595 M

The difference between the numbers,

(2.260×104)−(8.098×103) = 598.539.

Subtraction is a mathematic operation. Which is used to remove terms or objects in an expression.

Given:

Two numbers,

(2.260×104) and (8.098×103).

First, we simplify the numbers,

(2.260×104) = 235.04

And  (8.098×103) = 833.579.

The difference between the numbers,

(2.260×104)−(8.098×103) = 833.579 - 235.04.

(2.260×104)−(8.098×103) = 598.539

Therefore, then value is 598.539.

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The equilibrium constant shows the extent to which reactants are converted into products.

In this case, we must find the reaction quotient as follows;

Qc = [0.55]^2/[0.12] = 2.5

Since the Qc > Kc, it means that the reverse direction is favored in this reaction.

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sign of ∆H :-

We know

when methane burns in presence of oxygen heat is released as a form of energy so the reaction is exothermic.∆H must be -ve

#2

Answer:

Before we can sketch the Lewis structures of molecules, we must first understand the octet rule. The octet rule asserts that when atoms combine to create compounds, electrons are gained, lost, or shared among them, resulting in a stable electron configuration defined by eight valence electrons as a result. These rules are used in conjunction with the main-group components of the second period.

Explanation:

Hope it helps:)

Answer:

the amount of water vapor in the air compared to the amount it can hold

Explanation:

By definition, relative humidity is equal to the partial pressure of water divided by the total amount of water that the air can hold at that temperature. The last one basically restates the definition. (Partial pressure is the number of particles of a substance divided by the total number of particles.)

(Have a nice day too! Don't hesitate to ask any questions)

Answer:

0.11 m

Explanation:

H Ci + NaOH H2 O+ NaC1

by titration

0.0025 L of 0.13 mol Na OH = 0.00325 Mol NaOH

L

0.00325 Mol NaOH 1 Mol Hcl/I Mol NaOH = 0.00325 Mol hcl

now 0.00325 mol Hcl/ 0.030 L = 0.0108 M hcl

Answer:

C₄H₃N

Explanation:

To solve this question we must find the moles of each atom in order to find the empirical formula (Simplest ratio of atoms present in a molecule). With empirical formula and the molar mass of the compound we can find the molecular formula as follows:

Moles H:

91.5mg H * (1mmol / 1mg) =

91.5mmol H

Moles N:

424mg N * (1mmol / 14mg) =

30.286mmol N

The ratio of moles regard to moles N (The lower number of moles is:

H = 91.5mmolH / 30.286mmolN = 3.0

N = 30.286mmolN / 30.286mmolN = 1

empirical formula = CₓH₃N

The molar mass of this formula is:

12*x + 1*3 + 1*14 = 17g/mol

Solving for X:

12X + 17g/mol = 65g/mol

12X = 48g/mol

X = 4

There are 4 atoms of carbon and molecular formula is:

Answer:

A. Eight

Explanation:

Although there are eight major endocrine glands scattered throughout the body, they are still considered to be one system because they have similar functions, similar mechanisms of influence, and many important interrelationships.

Answer:

Hi! The answer to the first question is A. Nina hears the sound of her drum. This occurs last because all the other events must occur first in order for Nina to hear the drum. She must hit it, the surface of the drum must vibrate, and the sound waves must travel through the air. Only then will she hear the drum.

The answer to the second question is A. Hertz. The number of vibrations per second, or frequency, is measured in hertz (Hz).

Have a great day! - Mani :)