The statement that is true is that It is endothermic and DH equals +91.8 kJ.
What is the truth?We can see that in this case that the heat of the reaction which we cam also call the enthalpy of the reaction is positive. Let us know that when we have a positive enthalpy what we have is an endothermic reaction.
Endothermic reactions are typically observed as a decrease in temperature, as energy is absorbed from the surroundings to fuel the reaction. Examples of endothermic reactions include the melting of ice.
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Missing parts;
Given the balanced equation representing a reaction at 101.3 kPa and 298 K:
N2(g) + 3H2(g) => 2NH3(g) + 91.8 kJ
Which statement is true about this reaction?
(1) It is exothermic and DH equals -91.8 kJ.
(2) It is exothermic and DH equals +91.8 kJ.
(3) It is endothermic and DH equals -91.8 kJ.
(4) It is endothermic and DH equals +91.8 kJ.
Write a K expression for
[CoCl4]2-(aq)(blue) + 6H2O(l) ⇌ [Co(H2O)6]2+(aq)(pink) + 4Cl-(aq)
The relationship between a reaction's products and reactants with regard to a certain unit is expressed by the equilibrium constant, K.
Thus, When a reaction is homogeneous, all of the products' and reactions' states of matter are the same (the prefix "homo" means "same"). The solvent typically controls the reaction's overall state of matter.
When a reaction is in chemical equilibrium, the concentrations of the reactants and products do not significantly fluctuate over time. A double arrow between the reactants and products denotes these reversible reactions.
As described, this reaction is endothermic, therefore when heat is added, the equilibrium constant moves to the right. In turn, this turns the solution blue. Cl- is drawn out of solution by the addition of AgNO3.
Thus, The relationship between a reaction's products and reactants with regard to a certain unit is expressed by the equilibrium constant, K.
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The total number of atoms in 3.75 mol of ammonium nitrate, NH4NO3 , is
The total number of atoms in 3.75 mol of ammonium nitrate, NH4NO3, is equal to the Avogadro's number, which is 6.022 x 10^23, times the number of moles, which is 3.75 in this case.
Thus, the total number of atoms in 3.75 mol of ammonium nitrate is equal to 2.26 x 10^24 atoms.
This number can be further broken down into the number of atoms of each element present in the compound. Ammonium nitrate is composed of two elements, nitrogen (N) and hydrogen (H). For each mole of ammonium nitrate, there are 4 moles of hydrogen atoms and 2 moles of nitrogen atoms.
Therefore, in 3.75 moles of ammonium nitrate, there are 15 moles of hydrogen atoms and 7.5 moles of nitrogen atoms, which is equal to 9 x 10^24 hydrogen atoms and 4.05 x 10^24 nitrogen atoms.
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Use the reaction to answer the question.
Fe2O3 + 3H2SO4
How many atoms of oxygen will be found in the product(s) of the reaction?
4
15
12
3
Answer:
The Correct answer is 15
Answer:
B). 15
Explanation:
Please help me as soon as possible! Thanks so so much!!!
The equilibrium constant, which indicates how far a chemical process progresses, is a thermodynamic quantity.
What is the equilibrium constant?
The equilibrium constant is a ratio of the concentrations (or partial pressures) of the products to the concentrations (or partial pressures) of the reactants.
1) The equilibrium constant is;
Keq = 1/(3.5) * (1.5)^2
Keq = 0.13
2) 0.15 = [0.25]/1 * [CO2]
[CO2] = [0.25]/0.15
[CO2] =1.67
3) Ksp = [Mg^+] [Cl^-]^2
4 * 10^-2 = [Mg^+] * [3.5 * 10^-3]^2
[Mg^+] = 4 * 10^-2/ [3.5 * 10^-3]^2
= 3.3 * 10^-5 M
4) Ksp = x^2
Ksp = (2 * 10^-3)^2
= 4 * 10^-6
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The specific heat of a certain type of metal is 0.128 J/(g-°C). What is the final temperature if 305 J of heat is added to 91.2 g of
This metal, initially at 20.0 °C?
T final = __ °C
Can someone please help if you know the topic I’ll mark brainliest, if not please do not answer.
Answer: 46.07 °C.
Explanation:
If you have the reaction 2A(g) + B(g)C(g) + 2D(g), what will happen if you increase the pressure?
HELP!
If you increase the pressure of the reaction 2A(g) + B(g)C(g) + 2D(g)the reaction will shift forward to the side with little moles of gas.
What is the reaction about?Le Chatelier's principle states that if pressure is raised, the reaction will favor the direction with a lower number of gas moles.
On this case, the cleared out side includes a add up to of three gas moles (two moles of A and one mole of B), whereas the correct side covers four gas moles (one mole of C and two moles of D). In this way, the balance will move towards the left-hand side in arrange to diminish the collective gas particles and relieve the rise in weight. The levels of A and B will rise, as the levels of C and D will decrease.
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Which best describes homeostasis?
A. altering the external environment to accommodate the body's needs
B. maintaining a relatively stable equilibrium by physiological processes.
C. keeping the body in a fixed and unaltered stated.
D. maintaining a constant internal environment.
Answer:
Yeah, it's B.
Explanation:
Homeostasis is when the body maintains a near constant internal environment.
Determine whether each of the following will increase or decrease the rate of a chemical reaction
Lowering the temperature slows down the motion of molecules, leading to fewer effective collisions between reactant molecules, thus decreasing the rate of the reaction.
Decreasing the volume of the system or increasing the pressure of the system can increase the frequency of collisions between reactant molecules, thus increasing the rate of the reaction. This is because a decrease in volume or an increase in pressure leads to an increase in the concentration of reactants in the system.
Decreasing the surface area of the reactants decreases the number of collision sites available, leading to a decrease in the rate of the reaction.
Adding a catalyst lowers the activation energy required for the reaction to take place, leading to an increase in the rate of the reaction.
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Advancements in biotechnology have led to the development of laundry detergent enzymes that are more effective at removing stubborn stains from clothing. These enzymes can replace the phosphates used in traditional detergents.
Which statement best explains why laundry detergent enzymes are better than phosphate-based laundry detergents?
Responses
Detergent enzymes are better because they help limit phosphate pollutants in the environment. Option 3.
Benefits of detergent enzymesPhosphates are a common ingredient in traditional laundry detergents, but they can have harmful effects on the environment.
When phosphate-containing detergents are used, the phosphates can end up in waterways and cause excessive algae growth, leading to decreased oxygen levels in the water and harm to aquatic life.
Enzyme-based detergents can be a more environmentally friendly option as they do not contain phosphates, reducing the amount of phosphate pollution released into the environment.
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A certain bimolecular reaction at 40 °C at an activation energy of 30 kJ/mol. The addition of a catalyst reduces the activation energy by a factor of 2. How much faster does the catalyzed occur?
Select one:
OA. 318.63
OB. 358.63
C. 338.63
OD. 378.63
One day it is clear and sunny, but you notice that the pressure is less than it was the day before. What weather might be coming? Why?
Answer:
I believe your answer is
Explanation:
when the pressure is less I believe it means rain is coming
3 What does this model show?
AECO
A.A single type of atom bonded together
B.An element because all the particles are the same
C.A molecule because there is more than one type of atom
D.An element because there is more than one type of atom
The model shows a molecule because there is more than one type of atom (option C).
What is a molecule?A molecule is the smallest particle of a specific element or compound that retains the chemical properties of that element or compound.
A molecule is made up of two or more atoms held together by chemical bonds.
According to this question, a model AECO is given. Each alphabet represents a different element, hence, indicating that four different atoms are bonded together to form a molecule.
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Use the table of molar masses to answer the question.
Please help!
Element Molar Mass (g/mol)
silicon 28.09
oxygen 16.00
How many molecules of silicon dioxide (SiO₂) are there in a 15-gram sample?
6.022 x 1023
2.049 × 1023
1.503 x 1023
1.251 x 1023
The number of molecules of silicon dioxide (SiO₂) present in 15 grams of the sample is 1.503×10²³ molecules (3rd option)
How do i determine the number of molecules present?We'll begin by obtaining the mole of 15 g of SiO₂. This is shown below:
Mass of SiO₂ = 15 grams Molar mass of SiO₂ = 60.09 g/molMole of SiO₂ =?Mole = mass / molar mass
Mole of SiO₂ = 15 / 60.09
Mole of SiO₂ = 0.2496 mole
Haven obtain the mole, we shall determine the number of molecules. Details below:
From Avogadro's hypothesis,
1 mole of SiO₂ = 6.022×10²³ molecules
Therefore,
0.2496 mole of SiO₂ = 0.25 × 6.022×10²³
0.2496 mole of SiO₂ = 1.503×10²³ molecules
Thus, the number of molecules is 1.503×10²³ molecules (3rd option)
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Answer:
Chemistry B Semester Exam 5/4/2023
1. Cs-Br
2. K-C is ionic, and C-O is polar covalent
3. All molecules are in constant motion, so they all have some kinetic energy.
4. The reaction between substances A and B has a lower activation energy than the reaction between substances B and C.
5. More bond energy is absorbed on the reactants side than is released on the products side.
6. an exothermic reaction
7. Endothermic reactions have a higher activation energy. Endothermic reactions require more energy to break up the bonds of the reactants.
8. Heat must be released by the products in order to convert from the reactants.
9. Cooling a purple solution will turn it pink.
10. Both are flexible, but one conducts electricity while the other insulates.
11. high pressure, high-temperature water extraction
12. steel + vanadium for shock absorption
13. 15
14. the number of atoms, type of elements, and mass of reactants and products are equal.
15. 64 grams
16. 1.503x10^23
17. The relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same.
18. The plastic balls are a good representation of neutrons, but there is no splitting of nuclei as happens in fission.
19. beta minus decay
20. alpha decay
21. Greenhouse gases have more than two atoms, allowing them to vibrate and release radiation, warming the atmosphere.
22. cause: acid rain, consequence: destruction of crops
23. toxic bacteria in the water supply
24. it reaches hard to get to oil and gas deposits.
Readiness Test: Populations, Communities, and Ecosystems
The structure of an ecosystem is characterized by the organization of both biotic and abiotic components. The reduction of the resources decrease the population of a species. The correct option is A.
An ecosystem is defined as the structural and functional unit of ecology in which the living organisms interact with each other and the surrounding environment. The living components of the ecosystem are called biotic components and the non-living components are called abiotic components.
In short, raw material extraction can adversely affect the environment, biodiversity loss, damage to ecosystem functions and global warming.
Thus the correct option is A.
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Please help, chemistry is hard
The formula of the hydrate, given that 10.00 g of the hydrated was heated and 7.342 g of solid, (NH₄)₃PO₄ was leftover is (NH₄)₃PO₄.3H₂O (option B)
How do i determine the formulaof the hydrate?First, we shall determine the mass of the water in the hydrate. Details below:
Mass of hydrate = 10.00 gMass of anhydrous, (NH₄)₃PO₄ = 7.342 gMass of water, H₂O = ?Mass of water, H₂O = Mass of hydrate - Mass of anhydrous
Mass of water, H₂O = 10 - 7.342
Mass of water, H₂O = 2.658
Finally, we shall determine the formula of the hydrate. Details below:
Mass of anhydrous, (NH₄)₃PO₄ = 7.342 gMass of water, H₂O = 2.658Formula of hydrate =?Divide by their molar mass
(NH₄)₃PO₄ = 7.342 / 149.09 = 0.049
H₂O = 2.658 / 18 = 0.148
Divide by the smallest
(NH₄)₃PO₄ = 0.049 / 0.049 = 1
H₂O = 0.148 / 0.049 = 3
Thus, the formula of the hydrate is (NH₄)₃PO₄.3H₂O (option B)
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Assign the oxidation numbers of each element given bold in the following chemical species: HCI, NH3, NO3, K₂Cr₂O7, Hg₂Cl2, HgCl2, Al(OH)3, Na3PO4
Answer:
HCI: H has an oxidation number of +1 and Cl has an oxidation number of -1.
NH3: N has an oxidation number of -3 and each H has an oxidation number of +1.
NO3: N has an oxidation number of +5 and each O has an oxidation number of -2.
K₂Cr₂O7: K has an oxidation number of +1, Cr has an oxidation number of +6, and each O has an oxidation number of -2.
Hg₂Cl2: Each Hg has an oxidation number of +1 and each Cl has an oxidation number of -1.
HgCl2: Hg has an oxidation number of +2 and each Cl has an oxidation number of -1.
Al(OH)3: Al has an oxidation number of +3, each O has an oxidation number of -2, and each H has an oxidation number of +1.
Na3PO4: Na has an oxidation number of +1, P has an oxidation number of +5, and each O has an oxidation number of -2.
what is the starting concentration of the Cu+ solution
5.1 g sodium carbonate solution was dissolved in water to make 500cm³ of solution.20cm³ of this solution was tirated against 20.45 cm³ of 0.04M hydrochloric acid . Calculate the % of purity of the sodium carbonate solid
Answer:
We know that, Va= 20.45 cm³, Vs= 20 cm³, Ma= 0.04M . But molar mass of Na₂CO₃ = 106. So, concentration (g/dm³) = 0.02045 × 106 = 2.1677 g/dm³. Hence, The percentage purity of the sodium carbonate solid is 21.25%.
Which are true of a catalyst (select multiple)?
A catalyst lowers the activation energy of a reaction
A catalyst raises the activation energy of a reaction
The concentration of the catalyst will increase during the chemical reaction
The concentration of the catalyst will decrease during the chemical reaction
The concentration of the catalyst will remain constant during the chemical reaction
Calculate the volume in mL of 0.567 M Ca(OH)2 needed to neutralize 42.8 mL of 0.490 M H3PO4 in a titration.
The volume in mL of 0.567 M Ca(OH)₂ needed to neutralize 42.8 mL of 0.490 M H₃PO₄ in a titration is 36.98ml.
A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.
In a reaction to water, neutralization results in excess hydrogen or hydroxide ions present in the solution. The pH of the neutralized solution depends on the strength of the acid or base involved in it.
Given,
Concentration of calcium hydroxide = 0.567M
Volume of phosphoric acid = 42.8 moles
Concentration of phosphoric acid = 0.49M
During neutralization, the number of moles of acid and base remain same,
M₁V₁ = M₂ V₂
i.e. Moles of acid = moles of base
0.49 × 42.8 = 0.567 × V₂
V₂ = 36.98 ml
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If you mix 20.0 mL of 0.010 M MgCl2with 20.0 mL of 0.0020 M Na2CO3, will magnesium carbonate, MgCO3, precipitate out from the solution? Explain. Given: Ksp(MgCO3) = 4.0 × 10-5.
If you mix 20.0 mL of 0.010 M MgCl[tex]_2[/tex] with 20.0 mL of 0.0020 M Na[tex]_2[/tex]CO[tex]_3[/tex], magnesium carbonate will not precipitate out from the solution.
The byproduct of the condensing of atmospheric water vapour that falls from clouds as a result of gravitational pull is referred to as precipitation in meteorology. Rain, sleet, slush, ice pellets, graupel, drizzle, and hail are the main types of precipitation.
When a region of the outside world becomes completely saturated with water vapour, the water condenses or "precipitates" or falls. Because the water vapour does not enough condense to precipitate, fog and mist are instead colloids rather than precipitation. magnesium carbonate will not precipitate out from the solution.
Ksp =[Mg²⁺][CO₃²⁻]
[0.010][20] = C₂×40
C₂=0.001M
Q= 0.005×0.001
= 5×10⁻⁶M
Q<Ksp
precipitation will not occur
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What is the mass of 6.02 x 1024 molecules of the compound HCl?
Answer:
First, we need to determine the molar mass of HCl.
The molar mass of HCl = the mass of hydrogen (1.008 g/mol) + the mass of chlorine (35.45 g/mol) = 36.45 g/mol.
Next, we can use Avogadro's number (6.02 x 10^23 molecules/mol) to convert the number of molecules to moles:
6.02 x 10^24 molecules / 6.02 x 10^23 molecules/mol = 10 moles
Finally, we can use the molar mass to convert moles to grams:
10 moles x 36.45 g/mol = 364.5 grams
Therefore, the mass of 6.02 x 10^24 molecules of HCl is 364.5 grams.
A mixture of He , Ar , and Xe has a total pressure of 2.10 atm . The partial pressure of He is 0.250 atm , and the partial pressure of Ar is 0.300 atm . What is the partial pressure of Xe ? Express your answer to three significant figures and include the appropriate units.
The partial pressure of the gas in a mixture is the pressure that the gas would exert if present alone in the vessel at the same temperature as that of the mixture. Here the partial pressure of Xe is
The pressure exerted by a mixture of two or more non-reacting gases enclosed in a definite volume is equal to the sum of the partial pressures of the component gases.
According to Dalton's law of partial pressures, total pressure is:
P = p₁ + p₂ + ...
2.10 = 0.250 + 0.300 + p
p = 1.55
Partial pressure of Xe = 1.55
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If an ideal gas has a pressure of 7.07 atm, a temperature of 43.65 °C, and a volume of 64.01 L, how many moles of gas are in
the sample?
n=_____mol
Will mark brainly please help asap!
Answer:
17.4 mols
Explanation:
Use the ideal gas Law: Pv=nRt where P is pressure, V is volume, n is the number of mols, R is the Gas constant (0.08206 L*atm/mol*K), and T is the temperature in Kelvin.
Convert temperature to Kelvin: 43.65 C+273= 316.65 K
Pv=nRt -----> Plug in what is given and Solve the equation for n
7.07 atm*64.01 L= n *(0.08206 L*atm/mol*K)* 316.65 K
n= 17.4 mols
In addition to pH meter, what other methods and/or experimental devices may be used to determine the Ksp values of sparingly soluble electrolytes? Please give at least three examples.
What factor(s) may change Ksp values? Please elaborate your answer.
The solubility product of a sparingly soluble salt is defined as the product of molar concentrations of its ions in a saturated solution of it at a given temperature. The two important factors that affect the solubility product are pressure and temperature.
Using an electrical conductivity measurement, determine the ion concentration in a saturated solution and use this number to compute the solubility product.
Using a colorimetric technique, determine the ion concentration in a saturated solution and use this number to compute the Ksp.
It is the pressure which affects the solubility of gases only.
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consider the combustion of carbon monoxide in oxygen gas.2CO(g)+O2(g)=2CO2(g).In this reaction 10.8 moles of carbon dioxide was produced. Calculate the number of moles of carbon monoxide used in this reaction to produce such number of moles of carbon dioxide.
In this reaction 10.8 moles of carbon dioxide was produced. 10.8moles of carbon monoxide used in this reaction to produce such number of moles of carbon dioxide.
In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of very small objects like molecules, atoms, or other predetermined particles. The mole designates 6.02214076 1023 units, which is a very large number.
For the Worldwide System of Units (SI), the mole is defined as this number as of May 20, 2019, according to the General Convention on Measurements and Weights. The total amount of atoms discovered through experimentation to be present in 12 grammes of carbon-12 was originally used to define the mole.
2CO(g)+O[tex]_2[/tex](g)=2CO[tex]_2[/tex](g)
moles of carbon dioxide= 10.8 moles
According to stoichiometry
moles of carbon monoxide= (2/2)× 10.8 =10.8moles.
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If liquid carbon disulfide reacts with 4.5x10^2ml of oxygen to produce the gases carbon dioxide and sulfur dioxide what volume of each product is produced
If liquid carbon disulfide reacts with 4.5x10²ml of oxygen to produce the gases carbon dioxide and sulfur dioxide. 300mL is the volume of each product is produced.
A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, like the cubic metre or litre, or different imperial or US-standard units, including the gallon, quart and cubic inch.
Volume and length (cubed) have a symbiotic relationship. The volume more a container is typically thought of as its capacity, not as the amount of space it takes up. In other words, the volume is the quantity of fluid (liquid or gas) that the container may hold.
CS[tex]_2[/tex] (l) + 3O[tex]_2[/tex] (g) → CO[tex]_2[/tex](g) + 2SO[tex]_2[/tex] (g)
3 moles of oxygen gas form one mole of carbon dioxide
4.50 x 10² mL, or 450. mL
150. mL of CO2 (g)
Since 3 moles of oxygen produce 2 moles of sulfur dioxide,
450. mL×(3/2) =300 mL of SO2 (g).
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I am trying to utilize an acid-base neutralization reaction to remove limescale (CaCO3) from my faucet using hydrochloric acid (HCl). Which would help make this reaction go faster?
There is no way to speed up the reaction
Use less concentrated HCl solution
Using something abrasive to grind the limescale into smaller pieces
Cooling down the faucet by running cold water
Using a more concentrated HCl solution would help make the acid-base neutralization reaction go faster in removing limescale (CaCO₃) from your faucet.
What would help make this reaction go faster?
The rate of the reaction generally increases with the concentration of the reactants, so a more concentrated HCl solution will react more quickly with the limescale than a less concentrated one.
Using something abrasive to grind the limescale into smaller pieces might help expose more surface area of the limescale to the acid, but it would not directly affect the rate of the acid-base neutralization reaction.
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The compound oxygen difluoride is quite reactive, giving oxygen and HF when treated with water.
OF2(g) + H2O(g) -> O2(g) + 2HF(g)
E rxn = –318 kJ
Using bond energies, calculate the bond dissociation energy of the O–F bond in OF2
The compound oxygen difluoride is quite reactive, giving oxygen and HF when treated with water. -126kj is the bond dissociation energy of the O–F bond in OF[tex]_2[/tex].
The amount of energy necessary to homolytically shatter a chemical bond is known as bond dissociation energy. Radical species are often produced by a homolytic fracture. The abbreviations BDE, D0, and DH° are used to denote this energy.
Bond dissociation power is frequently used to gauge a chemical bond's strength as well as for contrasting different bonds. Be aware that the enthalpy change depends on the temperature. Bond dissociation energy is often measured in kJ/mol or kcal/mol.
-318 kJ/mol = BDE for OF[tex]_2[/tex]+ BDE for H[tex]_2[/tex]O - BDE for O[tex]_2[/tex] - 2 x BDE for HF.
Substituting all the values, we get
BDE of O–F bond = -126kj
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I WILL GIVE 35 POINTS TO THOSE WHO ANSWER THIS QUESTION RIGHT NOOOO SCAMS PLEASE
The number of mole of Ba₃(PO₄)₂ you can make from 3.54 L of 0.373 M BaCl₂ is 0.44 mole
How do i determine the mole of Ba₃(PO₄)₂ produced?First, we shall determine the mole in 3.54 L of 0.373 M BaCl₂. Details below:
Volume = 3.54 LMolarity = 0.373 MMole of BaCl₂ =?Molarity = Mole / Volume
Cross multiply
Mole = molarity × volume
Mole of BaCl₂ = 0.373 × 3.54
Mole of BaCl₂ = 1.32 mole
Finally, we can determine the mole of Ba₃(PO₄)₂ produced. Details below:
3BaCl₂ + 2H₃PO₄ -> Ba₃(PO₄)₂ + 6HCl
From the balanced equation above,
3 moles of BaCl₂ reacted to produce 1 mole of Ba₃(PO₄)₂
Therefore,
1.32 mole of BaCl₂ will react to produce = (1.32 × 1) / 3 = 0.44 mole of Ba₃(PO₄)₂
Thus, the number of mole of Ba₃(PO₄)₂ you can make from the reaction is 0.44 mole
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