Answer:
The answer is C
Explanation:
Aluminium oxide is an amphoteric oxide.
MgO is a basic oxide.
N2O is an acidic oxide.
SO2 is an acidic oxide.
Consider the intermediate chemical reactions. 2 equations. First: upper C a (s) plus upper C upper O subscript 2 (g) plus one half upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s). Delta H 1 equals negative 812.8 kilojoules. Second: 2 upper C a (s) plus upper O subscript 2 (g) right arrow 2 upper C a upper O (s). Delta H 2 equals negative 1, 269 kilojoules. The final overall chemical equation is Upper Ca upper O (s) plus upper C upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s).. When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed. is halved. has its sign changed. is unchanged.
Answer: When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
Explanation:
Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.
According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.
The overall chemical reaction follows:
[tex]CaO(s)+CO_2\rightarrow CaCO_3(s)[/tex] [tex]\Delta H^o_{rxn}=?[/tex]
The intermediate balanced chemical reaction are:
(1) [tex]Ca(s)+CO_2(g)+\frac{1}{2}O_2(g)\rightarrow CaCO_3(s)[/tex] [tex]\Delta H_1=-812.8kJ[/tex]
(2) [tex]2Ca(s)+O_2(g)\rightarrow 2CaO(s)[/tex] [tex]\Delta H_2=-1269kJ[/tex]
The expression for enthalpy of the reaction follows:
[tex]\Delta H^o_{rxn}=[1\times (\Delta H_1)]+[\frac{1}{2}\times (-\Delta H_2)][/tex]
Hence, when the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
Answer:
A. is halved and has its sign changed.
Explanation:
just took the test on edge
what is the other metal react iron which get rusted
Answer:
The answer is OXIDATION REACTION.
Answer:
There's no other metal.
Explanation:
Iron reacts only with water and air to get the object rusted. There is no other metal which reacts with iron to get the object rusted.
However,
Zinc can be used to protect Metal from Rusting.
Which statement is true of a reversible reaction at equilibrium?
А.
The concentration of reactants is less than the concentration of products.
B.
The concentration of reactants and the concentration of products are equal.
с.
The concentration of reactants is greater than the concentration of products.
D.
The concentration of reactants and the concentration of products are constant.
Ε.
The concentration of reactants is decreasing and the concentration of products is increasing,
Answer:
D.
The concentration of reactants and the concentration of products are constant.
Explanation:
pls mark as brainliest
Which refers to a measure of how acidic or basic a solution is? pH solubility reactiveness hardness
Answer:
it is Ph of solution that tells you the acdic and basic nature of solution
if PH is lower than 7 the soution is acidic and if PH is larger than 7 the solution is basic
Explanation:
Answer:
A. Ph
Explanation:
PLEASE HELP
Which Is a result of topsoil loss A increase soil fertility B poor crop production C soften soil surface D deposition of aggregate
Answer:
B - Poor crop production
Explanation:
I just did the quiz on Edge 2021
Answer:
b
Explanation:
In general, atmospheric pressure is greatest near Earth's surface and ____ as you move upward away from sea level.
(decreaes
(doubles
(stays the same
(increaes
Mass box A = 10 grams; Mass box B = 5 grams; Mass box C—made of one A and one B
How many boxes of A would be required to make 30 grams of C?
For the process 2SO2(g) + O2(g) Right arrow. 2SO3(g), Delta.S = –187.9 J/K and Delta.H = –198.4 kJ at 297.0 K are known. What is the entropy of this reaction? Use Delta.G = Delta.H – TDelta.S.
Answer:
The entropy of this reaction (ΔS) = -187.9 J/K
Explanation:
.Step : Data given
ΔS = -187.9 J/K
ΔH = -198.4 kJ
T = 297.0 K
Step 2: The balanced equation
2SO2(g) + O2(g) → 2SO3(g)
Step 3: Calculate the entropy
ΔG = ΔH - TΔS
⇒ΔG = the gibbs free energy
⇒ΔH = the change in enthalpy of the reaction = -198.4 kJ
⇒with T = the temperature = 297.0 K
⇒with ΔS = the change of entropy = -187.9 J/K
ΔG = -198400 kJ -297*(-187.9kJ/mol)
ΔG = -198400+55806.3
ΔG = - 142593.7 kJ = the gibbs free energy
The entropy of this reaction (ΔS) = -187.9 J/K
Answer:
C. -187.9 J/K
Explanation:
Entropy is just ΔS, which it gives you in the question as -187.9 J/K.
Power is measured in which unit?
Answer:
joules or watts
Explanation:
Answer:
the answer is B: watts
Explanation:
edge
What is the velocity of a wave with a wavelength of 0.03 m and a frequency of
120 Hz?
Answer:
3.6m/s
Explanation:
v= fλ
v= 120* 0.03
v= 3.6 m/s
How many moles of \ce{H2O}HX 2 O will be produced from 42.0 \text{ g}42.0 g42, point, 0, start text, space, g, end text of \ce{H2O2}HX 2 OX 2 ?
Answer:
1.272 moles are contained in 42 grams of water.
Explanation:
Chemically speaking, ice is the solid form of water and a molecule of water consist of two atoms of hydrogen and an atom of oxygen. Furthermore, atomic masses of hydrogen and oxygen are [tex]1.008\,\frac{g}{mol}[/tex] and [tex]15.999\,\frac{g}{mol}[/tex], respectively. A mole is the ratio of current mass of water to molecular weight of water, the latter one is now calculated before computing the amount of moles of water:
[tex]M = 1.008\,\frac{g}{mol} + 2\cdot \left(15.999\,\frac{g}{mol} \right)[/tex]
[tex]M = 33.006\,\frac{g}{mol}[/tex]
Finally, the amount of moles contained in 42 grams of ice is:
[tex]n = \frac{m}{M}[/tex]
[tex]n = \frac{42\,g}{33.006\,\frac{g}{mol} }[/tex]
[tex]n = 1.272\,mol[/tex]
1.272 moles are contained in 42 grams of water.
Esterification is what type of reaction? 1.addition 2.neutralization 3.combustion 4.equilibrium
Answer:
Equilibrium reaction
Explanation:
Give examples of partially miscible liquids.
Answer: Water, alcohols, aldehydes, and ketones.
Explanation:
Answer:
Examples of Partially Miscible and Immiscible Liquids: Illustrations of immiscible liquids are cooking oil and water, milk and oil, gasoline and water, and liquid metals and water. There are as well partially miscible liquids such as honey and water, butanol and water, and potassium chloride and water.
Explanation:
Hope it helps
Which symbol can be used to indicate the pressure at which a chemical reaction is carried out?
25°C
2 atm
Pt
Answer:
2 atm
Explanation:
Different symbols have different meanings in chemistry. For example, the symbol Δ = adding energy to the reactants.
To identify whether the reactants combine with a specific pressure, we have to use the symbol atm, in such a case 2 atm.
Hope that helps!
Dinitrogen pentoxide decomposes to form nitrogen dioxide oxygen, following the equation 2N2O3 - 4NO, + 0,. At
a certain timepoint, N2O5 is being consumed at a rate of 0.1 M/s. What's the rate of production of NO, and O, at the
same timepoint?
A. NO, is produced at 0.2 M/s, and O, is produced at 0.05 M/s.
B. NO, is produced at 0.2 M/s, and O, is produced at 0.2 M/s.
C. NO, is produced at 0.05 M/s, and O2 is produced at 0.2 M/s.
D. NO, is produced at 0.1 M/s, and O, is produced at 0.05 M/s.
Answer:
A. N₂O₅ is produced at 0.2 mol·L⁻¹s⁻¹, and O₂ is produced at 0.05 mol·L⁻¹s⁻¹.
Explanation:
2N₂O₅ ⟶ 4NO₂ + O₂
For every two molecules of N₂O₅ that disappear, we get four molecules of NO₂ and one of O₂.
NO₂ is forming twice as fast, and O₂ is forming half as fast, as N₂O₅ is decomposing.
N₂O₅ is decomposing at a rate of 0.1 mol·L⁻¹s⁻¹.
So, N₂O₅ is produced at 0.2 mol·L⁻¹s⁻¹, and O₂ is produced at 0.05 mol·L⁻¹s⁻¹.
Answer:
NO2 is produced at 0.2 M/s, and O2 is produced at 0.05 M/s.
Explanation:
Name the first 20 elements of the pereodic table
Answer:
alkali metals hydrogen lithium sodium potassium rubidium cesium francium alkaline earth metals beryllium magnesium calcium strontium barium radium group 3 boron aluminium gallium indium thalium carbon family carbon silicon germanium tin lead
Explanation:
i hope this will help you :)
There's Hydrogen and Helium
Then Lithium, Beryllium
Boron, Carbon everywhere
Nitrogen all through the air
With Oxygen so you can breathe
And Fluorine for your pretty teeth
Neon to light up the signs
Sodium for salty times
Silicon
(Phosphorus, then Sulfur) Chlorine and Argon
(Potassium) And Calcium so you'll grow strong
(Scandium) Titanium, Vanadium and Chromium and Manganese
This is the Periodic Table
Noble gas is stable
Halogens and Alkali react aggressively
Each period will see new outer shells
While electrons are added moving to the right
Iron is the 26th
Then Cobalt, Nickel coins you get
Copper, Zinc and Gallium
Germanium and Arsenic
Selenium and Bromine film
A very good example of soft water is A. Distilled water B. Sea water C. Underground water D. Polluted water
Answer:
The answer is option A.
Distilled water
Since all the chemicals that will cause hardness in the water has been removed.
Hope this helps.
synthetic fibres catch fire easily so they are_____
Answer:
artificial polymer fibers that melt upon heating
Explanation:
What is the complete ionic equation for the reaction between Na 2 SO 4 and CaCl 2 ?
Answer:
Na2SO4 + CaCl2 → 2Na+ SO4 2- + Ca2+ 2Cl-
Hope this helps.
Answer:
2Na+(aq)+SO42-(aq)+Ca2+(aq)+2Cl-(aq)->CaSO4(s)+2Na+(aq)+2Cl-(aq)
Explanation:
Which describes gneiss?
igneous
formed from shells
tends to split along bands
grains randomly arranged
Answer:
tends to split along bands
Explanation:
Answer: C
Explanation: E2022
I need an answer,
Chemistry "question":
Name this molecule.
Answer:
3–methylhexane.
Explanation:
To effectively name the compound given in the question, do the following:
1. Locate the longest continuous carbon chain. This gives the parent name of the compound.
2. Identify the substituent attached to the compound.
3. Locate the position of substituent in the compound using the lowest possible count.
4. Combine the above to get the name of the compound.
Now, let us name the compound with the illustration given above.
1. The longest continuous carbon chain is carbon 6 i.e Hexane
2. The substituent attached to compound is methyl i.e CH3.
3. The substituent i.e CH3 is located at carbon 3.
4. We shall combine the above to get the name of the compound. Therefore, the name of the compound is:
3–methylhexane.
The reaction of nitrogen gas and oxygen gas to form nitrogen monoxide gas is shown below. If the measured concentrations of all three chemicals at some point in time are: [N2] = 0.80 M
[O2] = 0.050 M
[NO] = 0.10 M
Which statement is TRUE about the reaction at this point in time? N2(g) + O2(g) ⇄ 2 NO(g) K = 0.10
The reaction is at equilibrium.
The reverse reaction is occurring at a faster rate than the forward reaction.
The forward reaction is occurring at a faster rate than the reverse reaction.
This set of concentration values is impossible because the concentrations of N2 and O2 must be the same.
Answer:
The reverse reaction is occurring at a faster rate than the forward reaction.
Explanation:
When the reaction:
aA + bB ⇔ cC + dD
has not reached the balance, it is possible to calculate:
[tex]Qc=\frac{[C]^{c}*[D]^{d} }{[A]^{a}*[B]^{b} }[/tex]
where Q is called the reaction quotient, and the concentrations expressed in it are not the equilibrium concentrations, but other concentrations given at a time of the reaction.
Comparing Qc with Kc allows to find out the status and evolution of the system:
If the reaction quotient is equal to the equilibrium constant, Qc = Kc, the system has reached chemical equilibrium. If the reaction quotient is greater than the equilibrium constant, Qc> Kc, the system is not in equilibrium. In this case the direct reaction predominates and there will be more product present than what is obtained at equilibrium. Therefore, this product is used to promote the reverse reaction and reach equilibrium. The system will then evolve to the left to increase the reagent concentration. If the reaction quotient is less than the equilibrium constant, Qc <Kc, the system is not in equilibrium. The concentration of the reagents is higher than it would be at equilibrium, so the direct reaction predominates. Thus, the system will evolve to the right to increase the concentration of products.In the case of the reaction:
N₂ (g) + O₂ (g) ⇄ 2 NO (g)
[tex]Qc=\frac{[NO]^{2} }{[N_{2} ]*[O_{2} ] }[/tex]
Being:
[N₂] = 0.80 M [O₂] = 0.050 M [NO] = 0.10 Mand replacing:
[tex]Qc=\frac{0.10^{2} }{0.80*0.050 }[/tex]
you get:
Qc= 0.25
Being Kc=0.10, Qc>Kc. Then the system is not in equilibrium and will evolve to the left to increase the concentration of reagents. So, the reverse reaction is occurring at a faster rate than the forward reaction.
Determine the genotypes of offspring 1-8.
Consider this reaction. What volume of oxygen gas, in milliliters, is required to react with 0.640 g of SO2 gas at S TP? 11.2 mL 22.4 mL 112 mL 224 mL
Answer:
112mL
Explanation:
We'll begin by calculating the number of mole in 0.640g of SO2.
This is illustrated below:
Molar mass of SO2 = 32 + (16x2) = 64g/mol
Mass of SO2 = 0.640g
Number of mole of SO2 =.?
Mole = mass /molar mass
Number of mole of SO2 = 0.640/64
Number of mole of SO2 = 0.01 mole
Next, we shall determine the number of mole of O2 required for the reaction. This is illustrated below:
2SO2(g) + O2(g) —> 2SO3(g)
From the balanced equation above,
2 moles of SO2 reacted with 1 mole of O2.
Therefore, 0.01 mole of SO2 will react with = (0.01 x 1)/2 = 0.005 mole of O2.
Therefore, 0.005 mole of O2 is required for the reaction.
Finally, we shall determine the volume of O2 required for the reaction as follow:
Note: 1 mole of a gas occupy 22.4L (22400mL) at stp.
1 mole of O2 occupy 22400mL at stp.
Therefore, 0.005 mole of O2 will occupy = 0.005 x 22400 = 112mL
Therefore, 112mL of O2 is required for the reaction.
Answer:
the answer is C
Explanation:
i did the test on edg and got it right
Which compound contains covalent bonds? AlN Ca3N2 NaCl HCl
Answer:
Ca3N2
Explanation:
What is the Ka of a 0.0796 M solution of nitrous acid (HNO2) with a pH of 2.95?
Answer:
Coefficient = 1.58
Exponent = - 5
Explanation:
pH = 2.95
Molar concentration = 0.0796M
Ka = [H+]^2 / [HA]
Ka = [H+]^2 / 0.0796
Therefore ;
[H+] = 10^-2.95
[H+] = 0.0011220 = 1.122 × 10^-3
Ka = [H+] / molar concentration
Ka = [1.122 × 10^-3]^2 / 0.0796
Ka = (1.258884 × 10^-6) / 0.0796
Ka = 15.815 × 10^-6
Ka = 1.58 × 10^-5
Coefficient = 1.58
Exponent = - 5
Which of the following has the shortest bond lenght Options A). H2 B).N2 C).O2 D).F2
Answer:
B. N2
Explanation:
The triple bonds pull the atoms closer together, and since N2 is the only molecule with the triple bond, it is the shortest bond length.
help on this one, i have no idea how to do it
Answer:
c
Explanation:
write the steps you would use for making tea.use the words solution,solvent,solute,dissolve,soluble,insoluble,filtrate and residue
what type of electromagnetic waves does the human eye see as the colors red, blue, or green
Answer:
Visible light waves
Explanation:
Visible light waves are the only electromagnetic waves we can see. We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength.