The heat released after the reaction is -184.79 kJ
The chemical reaction between methane and fluorine is
[tex] CH_{4}[/tex] + 4[tex] F_{2}[/tex] -> [tex] CF_{4}[/tex] + 4HF, where reactants are methane and fluorine. The products are carbon tetrafluoride and hydrogen fluoride.
The limiting reactant is hydrogen fluoride. Number of moles = (0.440 × 4)/4, here 4 is the number of moles of hydrogen fluoride and fluorine
Performing multiplication and division
Number of moles = 0.440 moles of HF
Enthalpy of reaction = -1679.54 kJ
Heat released = (0.440 × -1679.54)/4
Performing multiplication and division to find the heat released
Heat released = -184.749 kJ
Thus, the heat released is -184.79 kJ
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Balance the chemical equation for the
conversion of titanium dioxide to titanium chloride.
TiO₂ + Cl₂ + C → TICI + CO₂
Answer:
Explanation:
Here, we see that on the left-hand side the elements are as such -
TI - 1
O - 2
Cl - 2
C - 1
On the right-hand side, we have -
TI - 1
Cl - 1
C - 1
O - 2
So, this is how they will be balanced out -
2TIO₂ + Cl₂ + 2C => 2TICl + 2CO₂
Ionic bonds have all of the following properties, except ___.
soluable (ability to dissolve) in water
strong crystalline solids
generally white in color
when dissolved are electrically conductive
How can you describe carbohydrates
(Digestion, Intestine, Bile)is secreted by the liver to help in the breaking down of food particles.
Answer:
Bile
Explanation:
Bile is secreted by the liver to help in the breaking down of food particles.
when 2 moles of react with to form according to the following equation, 799 kj of energy are evolved. is this reaction endothermic or exothermic? endothermic what is the value of ?
The given question is incomplete and the complete question is
When 2 moles of Fe(s) react with Cl2(g) to form FeCl3(s) according to the following equation, 799 kJ of energy are evolved. Is this reaction endothermic or exothermic and What is the value of q
When 2 moles of Fe(s) react with Cl2(g) to form FeCl3(s) according to the following equation, 799 kJ of energy are evolved then the reaction is exothermic reaction and the value of q is -1598 kJ
Mole is the amount of substances of a specified elementary entity
2 moles of Fe(s) react with Cl2(g) to form FeCl3(s)
Energy = 799 kJ
We have to calculated reaction endothermic or exothermic = ?
The value of q = ?
So according to the reaction 799 kJ of energy are evolved it means that the enthalpy is negative as the reactant have more energy than the product and which means this is an exothermic reaction
And here we know that enthalpy of reaction is -799kJ/mol and considering the reacted 2 mole of solid iron then
q = 2 mol×-799kJ/mol
q = -1598 kJ
-1598 kJ energy are evolved when 2 mole of solid iron is react
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explain how nutrition hormones and exercise affect bone development and growth
Answer:
Explanation:
Numerous, controlled studies have demonstrated that people who exercise regularly have greater bone density than those who are more sedentary.
Any type of exercise will stimulate the deposition of more bone tissue, but resistance training has a greater effect than cardiovascular activities.
Hope this helps
14.55ml of 0.3674 m naoh was required to neutralize 25.00 ml of hcl with an unknown concentration. what was the concentration of the hcl solution in the units of mol/l?
14.55ml of 0.3674 m NaOH was required to neutralize 25.00 ml of HCl with an unknown concentration. the concentration of the HCl solution in the units of mol/l is 0.212 mol / L.
given that :
volume V1 = 14.55 mL = 0.0145 L
Molarity M1 = 0.3674 M
Volume V2 = 25 mL = 0.025 L
molarity M2 = ?
using the formula for dilution , we get ;
M1 V1 = M2 V2
0.3674 × 0.0145 = M2 × 0.025
M2 = 0.0053 / 0.025
M2 = 0.212 M = 0.212 mol / L
Thus, 14.55ml of 0.3674 m NaOH was required to neutralize 25.00 ml of HCl with an unknown concentration. the concentration of the HCl solution in the units of mol/l is 0.212 mol / L.
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Which statement correctly describes a chemical
reaction at equilibrium?
A.
B.
C.
D
The concentrations of the products and
reactants are equal.
The concentrations of the products and
reactants are constant.
The rate of the forward reaction is less than
the rate of the reverse reaction.
The rate of the forward reaction is greater
than the rate of the reverse reaction.
Answer: The concentrations of the products and
reactants are equal.
Explanation:
Calculate the AG° at 298 K for the following reaction. Show your work.
Fe₂O3(s) + 13CO(g) → 2Fe(CO),(g) + 3CO₂(g)
-824.2 -110.5
-733.8
-393.5
AH (kJ/mol)
87.4 197.6
AS (J/mol K)
445.2
213.6
The ΔG at 298K of the given reaction is -304.08kJ/mole.
Combustion is a high-temperature exothermic redox chemical reaction between a fuel and oxygen oxides. Photosynthesis is an example of an involuntary reaction. Plants absorb water and carbon dioxide. But for it to change, it needs sunlight. This is an involuntary reaction.
calculation:-
ΔG = ΔH -TΔS
Hence,
= (-733.8-393.5+824.2+110.5) - 298*(445.5+213.6-87.4-197.6)/1000
= -304.08kJ/mole
A spontaneous reaction is one that promotes the formation of products under the conditions under which the reaction occurs. A roaring campfire is an example of a natural reaction because it is exothermic. Processes that are spontaneous in one direction under certain conditions are not spontaneous in the reverse direction. For example, at room temperature and normal atmospheric pressure ice naturally melts but water does not naturally freeze.
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How do you find Mass number
Answer:
Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. A property closely related to an atom’s mass number is its atomic mass.
Explanation:
5. What are the coefficients when the equation below is balanced?
_H₂+_0₂→--H₂O
O 1,1,2
O 4,3,1
O 2,1,2
0 2,2,1
Answer:
C.) 2,1,2
Explanation:
You have to balance the equation by getting the number of elements on the left and right side to equal. Before balancing there is one more oxygen on the left side than the right side. You have to change the coefficient in front of H2O to fix this, and that means adding a "2" in front of the H2 to get that to equal as well.
You end up with 2H₂+10₂→ 2H₂O
The carbon cycle is normally self-regulating; it keeps itself constant. The amount of carbon dioxide kept in the oceans, locked in rocks and in the air is
ANSWER
over time.
Which model is useful in showing the reactivity of potassium?
Neither model is able to show the reactivity of potassium.
Model 1 because it shows an electron in the 4s orbital.
Model 2 because it shows an electron in the outermost ring.
Both models because each shows an electron in the outermost shell.
Both models are useful to describe the reactvity of potassium because each shows an electron in the outermost shell.
What are the valence electrons?Valence electrons can be described as the s and p electrons in the outermost shell while the electrons present in the inner shell are called core electrons.
Valence electrons can be all arranged in different shells and are negatively charged particles. These electrons are responsible for chemical interaction between atoms and the formation of chemical bonds.
Only the electrons present in the outermost shell can contribute in the formation of a chemical bond and decide the reactvity of atom such type of electrons is called valence electrons.
The reactivity in potassium can be seen due to one electron present in the valence shell.
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Five waves measure 25 cm and pass a point in 1 s. What is:
the wavelength
the frequency
the period?
Five waves measure 25 cm and pass a point in 1 s then the wavelength is 5cm the frequency is 5Hz and the period is 5 s
Wavelength is the distance between identical point in the adjacent cycle of a waveform signal propagated in space or along a wireFrequency is the number of waves that pass a fixed point in unit timeThis means the period of a wave is the inverse of the frequency so the formula for wave period is wavelength divided by velocityHere given data is
Five waves measure 25 cm and pass a point in 1 s
So, the wavelength = λ = v/f
Wavelength = 25 cm/5 waves
Wavelength = 5cm
Frequency = 1/T
Frequency = 1/5 = 5Hz
Period = 1/frequency
Period = 1/5 = 5 s
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gas of unknown molecular mass was allowed to effuse through a small opening under constant pressure conditions. it required 57 s for 1.0 l of the gas to effuse. under identical experimental conditions it required 26 s for 1.0 l of o2 gas to effuse. calculate the molar mass of the unknown gas.
The molar mass of the other gas is 153.79 g/mol
Step 1: The Data given,
It required 57 s for 1.0 L of the gas to effuse.
Under identical experimental conditions it required 26 s for 1.0 L of O2 gas to effuse.
Step 2: Calculate the molar mass
Graham's law of effusion says:
r1/r2 = √(M2/M1)
⇒ with r1 = effusion rate 1 = L/57s
⇒ with r2 = effusion rate 2 = L/26s
⇒ with M1 = molar mass of the gas = x g/mol
⇒ with M2 = molar mass of oxygen = 32 g/mol
We should be careful if we plug in the effusion rate. Because the fractions could flip if we don't give the effusion rates as numeral values.
(L/57s)/(L/26s) = 26/57 = √(32/M1)
26/57 =√(32/X)
(26/57) ² = 32/X
0.208064 =32/X
X = 32/0.208064
X = 153.79 g/mol
Hence, The molar mass of the other gas is 153.79 g/mol
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how do you think the phsyical properties (strength,flexibility, and viscosity) of the polymer would change if more borate ion had been added? why do you think that
The physical properties (strength, flexibility, and viscosity) of the polymer would change if more borate ion had been added is that it becomes thicker and the viscosity will decreases.
The reaction takes place when the borax is added to the solution. when we add the borax in the solution the glue and the borax will combine and form the new substance that is flexible and the springy. The physical properties like strength, flexibility and the viscosity would change.
Thus, The physical properties (strength, flexibility, and viscosity) of the polymer would change if more borate ion had been added is that it becomes thicker and the viscosity will decreases.
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the following metal specimen was tensile tested until failure. which type of metal would experience this type of failure?
brittle metal would experience this type of failure
Glass, ceramic, graphite, and some alloys with very low plasticity are examples of brittle materials. In these materials, cracks can start without plastic deformation and quickly progress to brittle breakage. It is a steel-gray, lightweight metal called beryllium. It is also highly brittle, which means that it fractures easily when under stress but does not typically distort before it does so (similar to glass or ceramic). Beryllium is a naturally occurring element found in over 100 different minerals and has a wide range of modern-day applications. Cast iron has a rough feel and is more brittle because it includes 2% to 3.5% carbon. Despite being made of alloyed metals, carbon steel lacks other alloying components, hence despite being an alloy, it is not classified as an alloy.
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calculate the theoretical yield of all products when 18.9 grams of lithium phosphate reacts with excess gold (i) acetate
The yield of products formed is:
gold phosphate equals 111.93 grams and the yield of lithium acetate 32.30 grams.
This theoretical yield can be calculated as:
Molar masses of reactants and products that they need. lithium phosphate equals 115.79 grams per mole. Mass of gold phosphate equals 685.87 grams per mole and the molar mass of lithium acetate equals 65.98 grams per mole. Using number of moles and mass of substance produced we can calculate the products formed.
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Which best explains how the chemical reaction shown below follows the law of conservation of mass? 2H2 + O2 → 2H2O
The given equation is showing the law of conservation of mass as the number of hydrogen and oxygen atoms are same on the both sides of the equation.
What is the chemical equation?A chemical equation can be described as the representation of a reaction in terms of chemical symbols of the substances. A chemical equation possesses of participating reactants in the reaction, formed products, and an arrow representing the direction of the chemical reaction.
The chemical equation in which the number of atoms of each element is equal on either side of the equation is called a balanced chemical equation.
The law of conservation of mass obeys by every balanced chemical equation. By following law of conservation, the total mass of the chemical elements on the reactant side should be equal to the total mass of chemical elements on the product side in a balanced chemical equation.
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in a mixture of an alcohol and ketone of equal molecular weight, which will have the larger rf value and why?
The ketone will have a larger rf value because it is more polar than the alcohol.
Does more polarity suggest a greater or lesser Rf value?
Calculating the Rf value is possible if you can see the spots.The identity and properties of the various compounds can be established using the Rf values.Since more polar compounds have a stronger affinity for the polar solid phase, they will have smaller Rf values.Rf values are typically higher for low-polarity chemicals compared to higher-polarity ones. Generally speaking, as the polarity of a compound increases, so does its absorptivity (i.e., the more polar the compound, the stronger it binds to the adsorbent).To learn more about Rf values, follow the link https://brainly.com/question/26639192
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would you expect the dissolved oxygen levels in water sampled from a stream entering a lake to be higher or lower than the dissolved oxygen levels in water sampled from the lake itself? explain why.
I would expect the dissolved oxygen levels from wаter entering а lаke to hаve lower thаn the lаke itself becаuse the steаm is аble to hаve wаrm wаter which cаn cаuse the lаke temperаture to be wаrm аlso. Hаving wаrm wаter meаns hаving less dissolved oxygen.
What is the dissolved oxygen level?Dissolved oxygen (DO) is the аmount of oxygen thаt is present in wаter. Wаter bodies receive oxygen from the аtmosphere аnd from аquаtic plаnts. Running wаter, such аs thаt of а swift moving streаm, dissolves more oxygen thаn the still wаter of а pond or lаke. Heаlthy wаter should generаlly hаve dissolved oxygen concentrаtions аbove 6.5-8 mg/L аnd dissolved oxygen sаturаtion between аbout 80-120%.
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A sample of 0.195g of potassium was added to 500cm3 of cold water. When the reaction was finished, 100cm3 of 0.100 mol/dm3 hydrochloric acid was added to form solution X.
i. Calculate the number of moles of hydroxide ions formed when the potassium was added to water.
ii. Calculate the number of moles of hydrogen ions in 100 cm3 of 0.100 mol/dm3 hydrochloric acid.
iii. Write a balanced equation for the neutralization reaction.
iv. Suggest a pH value for solution X. Explain your answer.
The calculations about the neutralization reaction show that;
1) hydroxide ions has a concentration of 0.0025 M
2) The amount of the HCl is 0.01 moles
3) The reaction equation is; [tex]KOH (aq)+ HCl(aq) ----- > H_{2} O (l)+ KCl(aq)[/tex]
4) The pH of the solution is 7.
What is the reaction?We know that the addition of the potassium to the water is going to lead to a reaction that would produce potassium hydroxide as one of the products of the reaction as we can see it; [tex]2K(s) + 2H_{2} O(l) ---- > 2KOH(aq) + H_{2}(g)[/tex]
Number of moles of the potassium used = 0.195g/39 g/mol
= 0.005 moles
Since we produced 0.005 moles of hydroxide ions, the concentration of the hydroxide ions is; 0.005 moles * 500/1000 L = 0.0025 M
ii) Number of moles of the hydrogen ions = Concentration * volume
= 0.1 * 100/1000
= 0.01 moles
The balanced reaction equation of the neutralization reaction is given by;
[tex]KOH (aq)+ HCl(aq) ----- > H_{2} O (l)+ KCl(aq)[/tex]
The pH of the solution ought to be seven.
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which is the best reason that the atomic radius generally increases with atomic number in each group of elements?
The atomic radius becomes larger as move down the group or column in the periodic table because it increases the number of energy levels with each successive period.
As we move down the group, the number of period increases, which means the number of shells in an atom also increases. So, the extra electrons are added in the next shell with each successive period down the group, and the atomic size increases with an increase in atomic number down the group.
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How many electrons are located in the outermost orbit in the bohr model of a boron atom?.
The number electrons in the outermost orbit in the Bohr model of a Boron atom is 3. The outermost orbit of the electrons of a Boron atom is in the L-shell.
What is Bohr model?The Bohr model is a structural model of an atom where the electrons revolve around the nucleus of an atom in distinct circular orbits (shells). Each shell has a maximum number of electrons by this formula: 2n², where n is the principal quantum numbers (n = 1, 2, 3, 4, ...).
The 1st orbit called K-shell has the maximum electrons 2(1)² = 2.The 2nd orbit called L-shell has the maximum electrons 2(2)² = 8.The 3rd orbit called M-shell has the maximum electrons 2(3)² = 18.The 4th orbit called N-shell has the maximum electrons 2(4)² = 32.The 5th orbit called O-shell has the maximum electrons 2(5)² = 50.The composition of numbers of electrons in each shell of an atom is called electronic configuration.
Boron is an atom with the atomic number 5. So, it has 5 electrons. The electronic configuration is
K-shell = 2 electronsL-shell = 3 electronsL-shell is the outermost orbit in the Bohr model of a Boron atom.
Hence, the number of electrons in the outermost orbit in the Bohr model of a Boron atom is 3.
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hydrochloric acid reacts with many metals to form hydrogen gas and the corresponding metal chloride. if you needed to produce hydrogen gas as a source of fuel, and given a choice of na, mg, al, or zn as the metal, which one would you choose to maximize the amount of hydrogen gas produced per gram of metal?
Magnesium would be chosen to produce the hydrogen gas .
What is Chemical reaction ?
There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.
Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.
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if you were asked to design a metal support bracket for a shelf, which of the strengths studied in this lab would you use to determine the design strength? why might you use a safety factor? explain your reasoning.
The safety factor describes how much more robust a system is than is necessary for the load that is intended.
The shape, dimensions, and holes of a metal support bracket determine its strength. Static loading, bracket material Designing a metal support bracket that is strong depends on the metal's thickness and profile. Thus, strength is determined by shape, size, and holes. The bracket's material not only determines its strength, but it also has the ability to withstand rusting. Static loading examines the amount of load the bracket can support before deflection to evaluate the strength. utilising the safety factor .
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Which of the following are spectator ions in the equation below? Select all that apply
Pb(C₂H302)2(ag) + 2 LiCl(ag) 2 LIC₂H302(ag) + PbCl2(s)
Pb2+(aq)
Li+(aq)
Cl-(aq)
C2H3O-2(aq)
I hope i entered the answer options right
The type of radioactive decay that releases only energy in order to become stable is
A. gamma decay
B.beta decay
C.electronic decay.
D. alpha decay.
Answer: B Is the answer
Explanation: I just did this
what will the evaporation of water and the formation of sea ice do to the salinity of water? group of answer choices
The ocean's salinity is raised by both sea ice production and ocean water evaporation. Ongoing inflow of fresh water from the rivers, fall of rain and snow, and the melting of ice constantly balance.
Why is water salinity important?It makes a significant contribution to conductance and influences many elements of the biochemistry in groundwaters as well as the biological activities that take place there. Temperature, pressure, and salinity all influence the physical properties of water, including its density its heat capacity.
How is water salinity influenced?Seawater salinity is impacted by rains, ice development, melting, and drainage. Seawater evaporate, leaving behind salts, which enhances their concentration and raises the salt of the water.
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if the bromobenzene is added too quickly, what side product is formed (draw the structure in pen and name it!)?
If the bromobenzene is added too quickly, biphenyl is formed as the side product with the Grignard reagent.
What is Grignard reagent?
Grignard reagent is an organomagnesium halide which has the formula RMgX where R is alkyl or aryl group, Mg is magnesium, X is an halide.
When bromobenzene is added too quickly to the Grignard reagent, biphenyl is formed as a by-product. the formation of the side product is enhanced by high temperature. So, this reaction is carried out in low temperature.
Therefore, biphenyl is formed as side product when bromobenzene is added quickly to the Grignard reagent. The structure of biphenyl is two benzene rings joined together.
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