The heat produced when iron oxide reacts with carbon monoxide is -23.47 kJ/mol.
What is the enthalpy of reaction?
The standard enthalpy of the reaction is given by the enthalpy of formation of the products and the reactants. The reactants and the products of the reaction are:
Fe₂O₃ (s) + 3CO (g) → 2Fe(s) + 3CO₂ (g)
We know,
The standard enthalpy of formation of iron oxide = −825.50 kJ/mol
The standard enthalpy of formation of carbon monoxide = −110.53 kJ/mol
The standard enthalpy of formation of carbon dioxide = −393.52 kJ/mol
The standard enthalpy of reaction is calculated as:
[tex]\rm \Delta H_{rxn}[/tex] = [2(0) + 3(−393.52)] - [1(-825.50) + 3(-110.53)]
= (0−1180.56+825.50+331.59)
= −23.47 kJ/mol
Therefore, −23.47 kJ/mol is produced.
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Evaluate which factor is most likely to cause the concentration of greenhouse gases in the earth's atmosphere to increase?
A.
decreased number of decomposing plants
B.
decreased number of volcanic eruptions
C.
increased frequency of earthquakes
D.
increased human industrial activities
Answer:
D. increased human industrial activities
all waves, except electromagnetic waves, need a medium to travel through. what is a "medium"? give 2 examples
Answer:
air water
Explanation:
Mediums that can have waves
what is the atomic number of sodium
The atomic number of sodium atom (Na) is 11.
What is atomic number?Atomic number of any atom is denoted by the symbol Z, and it is equal to the number of protons or electrons present in that atom.
In the sodium atom, number of proton is equal to 11 and number of electrons is also equal to 11. So the atomic number of sodium atom is 11.
Hence atomic number of sodium is 11.
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The atomic number of sodium is 11.
1. The atomic number of an element represents the number of protons in the nucleus of its atom.
2. Sodium is an element with the symbol Na, and its atomic number can be found on the periodic table.
3. Locate sodium (Na) on the periodic table. It is in the third period and belongs to Group 1, also known as the alkali metals.
4. The atomic number is usually displayed above or below the element's symbol. In the case of sodium, the atomic number is 11.
5. Therefore, the atomic number of sodium is 11. It means that a neutral sodium atom has 11 protons in its nucleus.
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HELP ASAP PLEASE!!!!!!!Which statements describe what happens in a redox reaction? Check all that apply. A. One substance gains electrons and one substance loses electrons. B. Electrons are moved between two substances. C. There are two reduction reactions. D. The anions on two compounds trade places
Electrons are moved between two substances.
Which type of fossil can be described as dead wood that has turned into stone?
a. cast fossil
b. sedimentary fossil
c. petrified
d. mold fossil
Answer:
The answer is c hope it is right if it is rong please tell me tho :)
Please help I do not understand
A model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
What is density?Density is a measure of the compactness of a material.
Density is defined as the ratio of mass to the volume of a substance.
Density = mass/volumeDense materials have tightly packed particles while less dense materials have greater spaces between their particles.
Avogadro's hypothesis applies to substances in gaseous form since they do not have a constant volume.
Therefore, a model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
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What are some applications of fission reactions? as a zero-waste energy source for generating large amounts of heat for creating stable elements from unstable ones for creating new, heavier elements as the energy source in nuclear weapons
Some of the applications of fission reactions are as follows:
for generating large amounts of heatfor creating stable elements from unstable onesas the energy source in nuclear weaponsWhat are nuclear fissions?Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
Nuclear fission involves the release of radioactive particles which causes a decrease in the number of atoms.
Nuclear fission have the following applications in industry:
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Which of the following is the best hypothesis?
OA. Physical changes are much less interesting to watch than
chemical changes.
B. If sodium carbonate is added to vinegar, the reaction will absorb
heat.
C. Tearing a piece of paper is an example of a physical change.
D. Some chemical reactions absorb heat, and others release heat.
SUBMIT
Help me y’all
Answer:
B.) If sodium carbonate is added to vinegar, the reaction will absorb heat.
Explanation:
A.) is incorrect because this is not testable. Rather, it is just an opinion that cannot be proven correct or incorrect.
B.) is correct because this statement is testable. Tests need to be run to determine the accuracy of the statement.
C.) is incorrect because this statement explains something that does not need to be tested. It is an example of a physical change when one tears a piece of paper.
D.) is incorrect because this is already a true statement. It is obvious that not all reactions absorb/release heat. While tests could be run to further prove this statement true, it is already considered accurate.
35.0g of zinc oxide react with what volume of oxygen at stp given the following reaction: zn + o2 --> zno
The volume of oxygen that would react at STP will be 6.00 L
Stoichiometric calculationFrom the equation of the reaction:
[tex]2Zn + O_2 --- > 2ZnO[/tex]
The mole ratio of [tex]O_2[/tex] to the ZnO produced is 1:2
Mole of 35 g Zn = 35/65.3 = 0.536 moles
Equivalent mole of [tex]O_2[/tex] that will react = 0.536/2 = 0.268 moles
1 mole of gas at STP = 22.4 L
0.268 moles of gas = 0.268 x 22.4 = 6.00 L
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Just look at pic please it has the question and answers
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's balance the given equation ~
[tex]\qquad \sf \dashrightarrow \:S_8 + O_2 \rightarrow SO_3[/tex]
[tex] \textsf{Step 1 - balance Sulphur (S) on both sides} [/tex]
[tex] \textsf{[ By multiplying} [/tex] [tex] \sf{SO_3} [/tex] [tex] \textsf{by 8 on product side ]} [/tex]
[tex]\qquad \sf \dashrightarrow \:S_8 + O_2 \rightarrow 8 \: SO_3[/tex]
[tex] \textsf{Step 2 - balance Oxygen (O) on both sides} [/tex]
[tex] \textsf{[ By multiplying} [/tex] [tex] \sf{O_2} [/tex] [tex] \textsf{by 12 on reactant side ]} [/tex]
[tex]\qquad \sf \dashrightarrow \:S_8 +12 \: O_2 \rightarrow 8 \: SO_3[/tex]
So, we can infer that the Correct choice is D
Name the molecule in the picture
Answer:
1,3 - dimenthylbenzene
Right option is (c).
Explanation:
⠀
⠀
As here in the figure, we can see the hexagonal shape with a circle inside it which depicts the benzene ring. And at 1 and 3 carbon atom, the methyl group is attach to the it.
⠀
It's formula will be
[tex] \sf C_8H_{10}[/tex]
It is also known as m-xylene.
⠀
And this organic compound is used in leather and rubber industries.
How is knowing conduction of heat useful to us? Explain in your own words please xx
There are a lot you want to know about heat transfer.
If u understand the mode of heat transfer well, then heat transfer is easy to continue.
Answer:
1: They give to the body Vitamin D 2: they give solar energy and that is what gives us revaluation around the sun (Drag) 3: it gives plants energy for photosynthesis (or dont know)
4:solar panels gives energy by the sun radio controlled area that gives us the battery's, lights etc...
Explanation:
EXPLAIN IT
This atom can form up to _____ single covalent bond(s). An atom with two electron shells. There is one electron pair in the inner electron shell and four unpaired electrons in the outer electron shell. 0 1 4 2 3
Answer:
4
Explanation: it's a carbon atom right....soo it'll form 4 bonds(single)
An atom can form 4 single covalent bonds is carbon with two electron shell.
What are covalent bonds?The bonds are defined as a strong bond that binds atoms, ions, or molecules together and promotes the production of molecules.
There are three types of bonds.
Ionic bondCovalent bondMetallic bondCovalent bonds are defined as the bond formed by sharing of electrons with each other.
Covalent bonding is a stable equilibrium of the attractive and repulsive forces between two atoms that occurs when they share electrons. Bonding pairs or sharing pairs are other names for these electron pairs.
It can also be defined as a type of chemical link where atoms share electrons to create electron pairs.
Covalent bonds has low melting point, boiling point, enthalpy of fusion and enthalpy of vaporization.
Thus, an atom can form 4 single covalent bonds is carbon with two electron shell.
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If you have 294grams of a decaying isotope, how many grams will remain active after 4 half-lifes?
Answer:
18.375 gm left
Explanation:
1/2 ^4 = 1/16th will be left (see the '4' representing 4 half lives?)
294 * 1/16 = 18.375 gm
-0)
2H2(g) + O2(9) - 2H20(9)
How many liters of Hy are required to form 5 moles of H20 at STP?
)
A)
)
11.2 liters
B)
22.4 liters
44.8 liters
D
112 liters
Now
At STP any gas weighs 22.4L
Volume of H_2
22.4+(5)112LWILL GIVE BRAINLIEST What would the products of a double-replacement reaction between LiCl and MgO be? (Remember: In double-replacement reactions, the two cations switch places and the two anions switch places.)
1. Why does cabbage juice have different colors at different pH levels?
2. Would the solution be acidic or basic when cabbage juice is pink?
1:Red cabbage contains a water-soluble pigment called anthocyanin that changes color when it is mixed with an acid or a base.
2: Basic
Some calcifiers can use bicarbonate (HCO3-) to make their shells.
How will they be affected by the decrease in pH?
Answer:
The removal of this ion from water by the calcifiers will definitely decrease the pH of water.
What is the bicarbonate ion?
The bicarbonate ion is the ion that is designated as HCO3-. We must notice that this ion is present in abundant amounts in the sea. This amount definitely make the sea slightly alkaline.
Now we must note that the removal of this ion from water by the calcifiers that require it to make their shell will definitely decrease the pH of water.
Explanation:
The removal of this ion from water by the calcifiers will definitely decrease the pH of water.
What is the bicarbonate ion?The bicarbonate ion is the ion that is designated as [tex]HCO^{3-}.[/tex] We must notice that this ion is present in abundant amounts in the sea. This amount definitely makes the sea slightly alkaline.
Now we must note that the removal of this ion from water by the calcifiers that require it to make their shell will definitely decrease the pH of water.
Hence, the removal of this ion from water by the calcifiers will definitely decrease the pH of water.
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How many grams of sodium chlorate(nacio3) are in 1.23 x10^23 representative particles?
Answer:
About 21.7 grams.
Explanation:
To find the mass of a sample of sodium chlorate (NaClO₃) given the amount of particles present, we can convert from particles to moles, and moles to mass using its molecular weight.
The molecular weight of sodium chlorate is:
[tex]\displaystyle \begin{aligned} \mathcal{M}_\text{NaClO$_3$} &= (22.99 + 35.45 + 3(16.00)) \text{ g/mol} \\ \\ & = 106.44\text{ g/mol} \end{aligned}[/tex]
And recall that in one mole of any substance, there are 6.02 × 10²³ of it. Hence:
[tex]\displaystyle \begin{aligned} 1.23\times 10^{23} \text{ NaClO$_3$} &\cdot \frac{1\text{ mol NaClO$_3$}}{6.02\times 10^{23}\text{ NaClO$_3$}} \cdot \frac{106.44\text{ g NaClO$_3$}}{1\text{ mol NaClO$_3$}} \\ \\ &= 21.7 \text{ g NaClO$_3$} \end{aligned}[/tex]
In conclusion, there are about 21.7 grams of sodium chlorate.
what is the important of Noble gases
Answer:
most often helium and argon, the least expensive—are used to provide chemically unreactive environments for such operations as cutting, welding, and refining of metals such as aluminum (atmospheric oxygen and, in some cases, nitrogen or carbon dioxide would react with the hot metal).
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Jack would probably say his lines with a _______ voice.
A. puzzled
B. delighted
C. whining
A. because he might be in trouble in a play
Name these compounds according to IUPAC.
IUPAC is the nomenclature approach used for naming compounds. The compounds are ethane, butane, and butene.
What is IUPAC?IUPAC is the nomenclature method of the organic compounds that are universal and is recommended by the International union so that the names of the same chemical species are constant and ubiquitous all over.
The first compound has a single bond and two carbons hence ethane, the second compound has a single bond and four carbons and hence butane, and the third compound has one double bond and four carbon atoms and hence butene.
Therefore, the compounds are ethane, butane, and butene.
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If a substance cannot be separated by physical means or chemical means, it is ___________.
Question 4 options:
an element
a solution
a molecule
a compound
An element is a pure substance that cannot be separated into simpler substances by chemical or physical means
Answer:
It is an element.
Explanation:
chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.
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How many molecules are in a 45g sample of water?
Answer:
Solution : Number of moles of water `=(" Mass of water ")/(" Gram molecular mass of water ")= (45g)/(18g)= 2.5`. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.Explanation:
Hope It helps u
The common functions of all cells include:
2.0 mL of a 0.75 M solution of potassium permanganate , KMnO4 solution is used to make a 500 mL solution . What is the concentration of the new solution ?
The concentration of the new solution is 0.003 M.
How do we calculate the required concentration?Required concentration of the final solution will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ & V₁ are the molarity and volume of initial solution.
M₂ & V₂ are the molarity and volume of final solution.
On putting values from the question, we get
M₂ = (0.75)(2) / (500) = 0.003 M
Hence required concentration is 0.003M.
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Which is the balanced equation for v2o5 cas → cao v2s5? v2o5 cas → cao v2s5 5v2o5 5cas → 10cao 5v2s5 3v2o5 3cas → 3cao 3v2s5 v2o5 5cas → 5cao v2s5
We have the balanced reaction equation as; V2O5 + 5CaS → 5CaO + V2S5.
What is a balanced reaction equation?A balanced reaction equation is one in which the number atoms atoms on the reactant side is the same as the number of atoms on the products side.
In that case, we have the balanced reaction equation as; V2O5 + 5CaS → 5CaO + V2S5.
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Answer:
d
Explanation:
got 100
Which of the following increases air’s ability to hold water vapor? a. increase in wind speed c. decrease in temperature b. increase in temperature d. decrease in air pressure Please select the best answer from the choices provided A B C D
Increase in temperature increases air's ability to hold water vapour. That is option B.
What is water vapour?Water vapor is defined as the form of water when in gaseous state.
Water turns to vapour when heat is added to it leading to evaporation.
Therefore, Increase in temperature increases air's ability to hold water vapour.
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5. Elements are different because they contain different numbers of protons.
Answer:
True
Explanation:
The number of electrons are what determine an atom.
The number of electrons = number of protons
so the elements are different.
If the number of neutrons are different but the number of electrons and protons are same they are of the same element.
But here the number of protons are different so this is another element.
What kind of radioactive element is useful for dating an object?
a. one with a half-life close to the age of the object
b. one that is present in very small amounts
c. one that decays very quickly into a stable form
d. one that does not undergo transmutation
The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
What are radioactive elements?Radioactive elements are elements that involved in radioactivity and this comprises of atoms or particles in their nuclei whose atomic nuclei are not stable and they emit radiations to maintain stability.
Therefore, The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
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