NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆ H:255.95
Further explanationGiven
Reaction and the enthalpy
Required
The change of enthalpy
Solution
Reaction 1
N2 (g) + 3H2 (g) --> 2NH3 ∆ H: -91.8 kJ/mol⇒reverse
2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol
Reaction 2
C (s, graphite) + 2H2 (g)⇒ CH4 (g) ∆H: -74.9 kJ/mol ⇒reverse
CH4 (g) ⇒ C (s, graphite) + 2H2 (g) ∆H: +74.9 kJ/mol ⇒ x2
2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mo
Reaction 3
H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g);∆ H: +270.3 kJ/mol
Add up all the reactions and remove the same compound from different sides :
2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol
2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mol
H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g) ∆ H: +270.3 kJ/mol
-----------------------------------------------------------------------------------------
2NH3(g) + 2CH4(g) ⇒ 2HCN + 6H2 ∆ H: 511.9 ⇒ :2
NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆ H:255.95
Based on the reactivities of the elements involved, which reaction will form products that are more stable than the reactants?
Answer:
Exothermic reaction
Explanation:
Since in an exothermic reaction heat is released, the products will be more stable than the reactants.
Which of the following is NOT a sign of a chemical reaction?
A. Change in color
B. Change in size
C. Bubble formation
D. A temperature change
. The atoms are held together because they both pull on the ________________ electrons
Answer:
negative and positive i think
Explanation:
In the diagram of a transverse wave shown, what does M represent?
Transverse Wave
P=1cycle per second
A. Wavelength
B. Frequency
C. Amplitude
D. Rest positions
In the diagram of a transverse wave, P = 1 cycle per second, M represent wavelength. Therefore, option A is correct.
What is transverse wave ?A wave is considered to be transverse if its oscillations run counterclockwise to the wave's direction of advance. A longitudinal wave, on the other hand, moves in the direction of its oscillations. Transverse waves include water waves.
Due to the shear stress produced, transverse waves are frequently observed in elastic solids; in this situation, the oscillations are caused by the displacement of the solid particles from their relaxed state in directions perpendicular to the wave's propagation.
Trough: A transverse wave's lowest point. The distance separating one transverse wave's peak from the next is known as the wavelength. The distance from the wave's resting position to its crest is its amplitude.
Thus, option A is correct.
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aspirin is a compound that contain carbon,hydrogen and oxygen. It is uesd as painkiller. An aspirin tablet contain 1.25×10³⁰ molecule. How many moles of this compound are present in the tablet
Answer:
Number of molecules = 1.25 x 10 30 molecules
Avogadro’s number = 6.022 x 10 23
Number of moles = ?
Formula
Number of moles = 1.25 x 10 30
6.022 x 10 23
= 2.07 x 106 moles
Explanation:
How many seconds are in 209.7 ms?
Answer:0.21 seconds
Explanation:
Just because it is and how science works
Answer:
0.21 seconds, please let me know if I am wrong
When enthalpy of reactants is higher than the product then the reaction will be.
Answer:
The reaction will be endothermic represented by a positive (+) sign
Is the specimen classified as living or non-living? Use three pieces of evidence and reasoning to justify your answer. Provide 3 out of the 7 characteristics of life criteria to use as evidence.
Answer: All living things move in some way. This may be obvious, such as animals that are able to walk, or less obvious, such as plants that have parts that move to track the movement of the sun. All living things grow. Earthworms hatch from eggs and can grow up to a metre or more in length! Some earthworms are also able to regrow small parts of their body that have been lost or injured. Chromists are a diverse group of plant-like organisms and range from very small to very large. They are found in almost all environments.
Explanation: I hope that helped yall!
Which of the following reactions would result in increased entropy?
Answer:
A option
Explanation:
Because recatants are in solid form having less enetropy and products are liquid form having more entropy
While other options reactants and products are in same phase gas phase having same entropy
The reaction that would result in increased entropy is the combustion reaction;
KNO3(s)--->K+(aq)+NO3-(aq). Option A
This is further explained below
What is a combustion reaction?Generally, a combustion reaction is simply a combustion process that occurs when a material combines with oxygen gas, producing energy as light and heat.
In conclusion, the chemical reaction KNO3(s)--->K+(aq)+NO3-(aq) is has all properties of a combustion reaction as the solid reactants gives an aq solution.
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what do african snails eat
Answer:
hope it helps you a little
When hydrogen gas reacts with oxygen gas, the potential energy diagram for the reaction will appear more to which of the following?
Answer:
Maybe is D....
Explanation:
When the hydrogen peroxide decomposed,it graph such as A so maybe the formation of hydrogen peroxide is opposite direction as the A....Hope can help you.....
which description shows copper at rtp?
a) stationary and closed together
b) stationary and randomly arranged
c)vibrating and in a regular arrangement
d) vibrating and in a random arrangement
Answer:
c)vibrating and in a regular arrangement
Explanation:
Copper is a chemical element represented by the symbol Cu and having atomic number 29. Copper is a transition metal which means its subshells are not completely filled and that is why they are vibrating in the room temperature. But copper is a solid at room temperature with regular arrangement of atoms.
Hence, the correct answer is "c)vibrating and in a regular arrangement".
4 Fe + 3 O2 --> 2 Fe2O3
How many grams of Fe will react with 40.0 grams of O2?
Answer:
93.33 g of Fe
Explanation:
The balanced equation for the reaction is given below:
4Fe + 3O₂ —> 2Fe₂O₃
Next, we shall determine the masses of Fe and O₂ that reacted from the balanced equation. This can be obtained as follow:
Molar mass of Fe = 56 g/mol
Mass of Fe from the balanced equation = 4 × 56 = 224 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ from the balanced equation = 3 × 32 = 96 g
SUMMARY:
From the balanced equation above,
224 g of Fe reacted with 96 g of O₂.
Finally, we shall determine the mass of Fe required to react with 40 g of O₂. This can be obtained as follow:
From the balanced equation above,
224 g of Fe reacted with 96 g of O₂.
Therefore, Xg of Fe will react with 40 g of O₂ i.e
Xg of Fe = (224 × 40)/96
Xg of Fe = 93.33 g
Therefore, 93.33 g of Fe is required to react with 40 g of O₂.
What are the products of the combustion of a hydrocarbon?
O carbon and oxygen
O carbon dioxide and water
O carbon and hydrogen
O carbon dioxide and hydrogen
Answer:
carbon dioxide and water
The products of the combustion of a hydrocarbon is carbon dioxide and water. Hence option B is correct.
What is Hydrocarbon ?Hydrocarbon is a compound to which hydrogen atoms are attached to carbon atoms. Those are the chief components of petroleum and natural gas. Methane, Ethane, Butane and Pentane etc. are the examples of the hydrocarbon. liquid petroleum gas which we use to cook food in our home is a butane gas which is hydrocarbon.
when hydrocarbon react it releases heat, and carbon dioxide and water as by products.
lets see such a reaction for an example.
when methane react with a oxygen, it gives water and releases carbon dioxide.
CH₄ + 2O₂ ======= CO₂ + 2H₂O
Hence combustion of hydrocarbon gives water and carbon dioxide, option B is correct.
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8.0 dm of NO is mixed with 6.0 dm3 of O, at room temperature and pressure (RTP).
The reaction below takes place until one of the reactants is used up.
2NO(g) + O2(g) + 2NO,(9)
What is the volume of the mixture at RTP after the reaction has taken place?
A)8.0 dm3
B)10.0 dm3
C)12.0 dm3
D)14.0 dm3
Answer:
B)10.0 dm3
Explanation:
Now we have to apply Gay-Lussac's law which states that gases combine in simple volumes provided the temperature and pressure remain constant.
2NO(g) + O2(g) ------>2NO
combining volumes 2 : 1 : 2
Volumes before reaction 8.0 6.0 0.0
Reacting volumes 8.0 4.0 8.0
Volumes after reaction - 2.0 8.0
Therefore;
Total volume after reaction = 2.0 + 8.0 = 10.0 dm^3
The volume of the mixture after the reaction is 10 dm³
The correct answer to the question is Option B. 10 dm³
The above is simply a demonstration of Gay-Lussac' law. The volume of the mixture after the reaction can be obtained as follow:
2NO(g) + O₂ —> 2NO(g)
Combining Vol: 2 dm³ : 1 dm³ : 2 dm³
Before reaction: 8 dm³ : 6 dm³ : 0
During reaction: 8 dm³ : 4 dm³ : 8 dm³
After reaction: 0 dm³ : 2 dm³ : 8 dm³
The Volume after the reaction = 2 + 8 = 10 dm³
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What best explains why you should use transitions when writing an argument? Transitions help engage and interest the reader in the argument’s subject matter. Transitions help clarify the central argument for the reader. Transitions help the reader understand how the ideas in the argument are connected. Transitions make reading an argument smoother and more enjoyable.
Answer:
c
Explanation:
trust
Transitions help the reader understand how the ideas in the argument are connected best explains why you should use transitions when writing an argument. Therefore, option C is correct.
Why is it important to use transitions?They are cues that assist the reader in understanding your ideas. Transitional words or phrases help you move your thoughts from one sentence to the next and from one paragraph to the next.
Finally, transitional words smoothly connect sentences and paragraphs so that there are no abrupt jumps or breaks between ideas.
They make a direct link between ideas, sentences, and paragraphs. Specific words are used in effective transitions. Avoid using pronouns such as "this" to refer to an entire concept because it is not always clear who or what "this" refers to.
Transitions help the reader understand how the ideas in the argument are connected, which is why you should use them when writing an argument.
Thus, option C is correct.
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1. How many grams are in 0.20 moles of N,?
Answer:
[tex]\boxed {\boxed {\sf About \ 2.8 \ grams \ of \ nitrogen}}[/tex]
Explanation:
To convert from moles to grams, we must use the molar mass.
1. Molar Mass
The molar mass of an element can be found on the Periodic Table. We are looking for nitrogen or N.
Nitrogen (N): 14.007 g/mol2. Convert from moles to grams
Use the molar mass as a ratio or fraction.
[tex]\frac{14.007 \ g \ N}{1 \ mol \ N}[/tex]
Multiply the given number of moles (0.20) by the fraction we just made.
[tex]0.20 \ mol \ N *\frac{14.007 \ g \ N}{1 \ mol \ N}[/tex]
When multiplied, the moles of nitrogen will cancel each other out.
[tex]0.20*\frac{14.007 \ g \ N}{1}[/tex]
The denominator of 1 can be ignored to create a simple multiplication problem.
[tex]0.20 *14.007 \ g \ N[/tex]
[tex]2.8014 \ g \ N[/tex]
3. Round
The original measurement of moles (0.20) gives 2 significant figures, the last 2 and 0.
Therefore, we must round our answer to 2 sig figs. This is the tenths place for this number of grams we found.
[tex]2.8014 \ g \ N[/tex]
The 0 in the hundredth place tells us to leave the 8 in the tenth place.
[tex]\approx 2.8 \ g\ N[/tex]
There are about 2.8 grams of nitrogen in 0.20 moles of nitrogen.
What occurs as the atomic number of the elements in Period 2 increases?
1)The nuclear charge of each successive atom decreases, and the atomic radius decreases.
2)The nuclear charge of each successive atom decreases, and the atomic radius increases.
3)The nuclear charge of each successive atom increases, and the atomic radius decreases
4)The nuclear charge of each successive atom increases, and the atomic radius increases.
Answer:
3)The nuclear charge of each successive atom increases, and the atomic radius decreases
Explanation:
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
aluminiuim is obtained industrially by the electrolysis of aluminium oxide heated to high temperatures. explain the meaning of the term electrolysis.
Answer: When an electric current is passed through a substance to effect a chemical change.
What forms when two atoms combine? PLEASE HELP!!!!!!!
A. a molecule
B. a nucleus
C. a proton
D. an electron
Answer:
Option A - nucleus
Explanation:
A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.
Two atoms combine to form a molecule.
What is a molecule?
Molecule is two or more atoms connected by chemical bonds and form the smallest unit of a substance that retains the composition and properties of that substanceThe atoms can be the same like in oxygen molecule - An oxygen molecule has 2 oxygen atomsThe atoms can be different like in a water molecule - A water molecule has 2 hydrogen and 1 oxygen atomWhat is a nucleus?
The nucleus is positively charged region at the center of the atomIt consists of two types of subatomic particles packed together. The particles are protons and neutronsProton has a positive charge and neutron is electrically neutralWhat is a proton?
A proton is a subatomic particle found in nucleus of every atomProtons have a positive electric charge The number of protons in each atom is its atomic numberWhat is an electron?
It was discovered by English physicist J.J.Thomson Electron is a negatively charged subatomic particle that can be either bound to an atom or freeThey exist outside the nucleusThey are significantly smaller in mass and have both wave-like and particle-like characteristicsLearn more about Molecules at https://brainly.com/question/13348791
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PLEASE HELP ME ASAP IM DYING
Answer:
Empirical formula is NH₃
Explanation:
Given data:
Percentage of hydrogen = 82%
Percentage of nitrogen = 18%
Empirical formula = ?
Solution:
Number of gram atoms of H = 18 / 1.01 = 17.8
Number of gram atoms of N = 82 / 14 = 5 .9
Atomic ratio:
H : N
17.8/5.9 : 5.9/5.9
3 : 1
H : N = 3:1
Empirical formula is NH₃
What is the general trend for electron affinity values going across a period?
Answer:
increase.
Explanation:
as you cross the period the atomic size decrease makes the atoms to have more affinity to the coming electrons.
What is the noble gas electron configuration of bismuth (Bİ)?
OA [Kņ6s 6p
OB. e] 6s 6p
Oc. pke) 4l4 5d0 6s 6p
OD. [Kr] 5 5105p5 6s 6d10 6p?
OE. e) 6s5d0 6p
Answer: [Xe] 6s^2 6p^3
Explanation: The noble gases are on the last column of the periodic table and Xenon (Xe) is the noble gas before Bismuth (Bi). Then you go down to the next row which is 6s^2 and 6p^3.
Answer:
The correct answer is {Xe] 4f14 5d10 6s2 6p3
Explanation:
A serving of Frosted Flakes cereal contains 235,000 J of energy. Calculate the change in temperature (ΔT) that would occur if this food was used to heat 1,000 grams of water.
The change in temperature (ΔT) : 56.14 ° C
Further explanationGiven
Cereal energy = 235,000 J
mass of water = 1000 g
Required
the change in temperature (ΔT)
Solution
Heat can be formulated :
Q = m . c . ΔT
c = specific heat for water = 4.186 J / gram ° C
235000 = 1000 . 4.186 . ΔT
[tex]\tt \Delta T=\dfrac{235000}{1000\times 4.186}=56.14^oC[/tex]
What type of glassware is useful for transferring liquids from the large stock container to a smaller container such as a graduated cylinder
Answer:
Beaker
Explanation:
In the laboratory, we often need to transfer liquids from a large stock container to a graduated cylinder in order to measure a specific volume of liquid.
This is done using a beaker. A beaker is a lipped cylindrical glass container for laboratory use (Oxford dictionary).
Hence, when transferring liquids from the large stock container to a smaller container such as a graduated cylinder, we use a beaker.
Is it physically possible to create a chemical serum that would give you any sort of superpower??
multiple choice-- please help!
Study the chemical reaction.
A ⟶ B + C
This reaction is second order in A.
What is the rate law for this reaction?
Rate = K [B][C]^2
Rate = K [A]^2
The rate law for the reaction : r=k.[A]²
Further explanationGiven
Reaction
A ⟶ B + C
Required
The rate law
Solution
The rate law is a chemical equation that shows the relationship between reaction rate and the concentration / pressure of the reactants
For the second-order reaction it can be:
1. the square of the concentration of one reactant.
[tex]\tt r=k[A]^2[/tex]
2. the product of the concentrations of two reactants.
[tex]\tt r=k[A][B][/tex]
And the reaction should be(for second order) :
2A ⟶ B + C
Thus, for reaction above (reactant consumption rate) :
[tex]\tt r=-\dfrac{\Delta A}{2\Delta t}=k[A]^2[/tex]
What happens if you were to swallow a small amount if wet nail polish? Answer truthfully in your own words.
Answer:
I'm pretty sure you'll be fine
Explanation:
I've swallowed more than a small amount and I'm ok sort of
which of the following has the smallest radius? K+, K, Rb, Rb+
:
Option (c) is the correct answer.
Explanation:
It is known that when we move down a group then there is increase in size of atom. This is because there occurs increase in number of shells in the atom.
Also, when an atom loses electrons then it acquires a positive charge and size of the atom decreases. On the other hand, when an atom gain electrons then it acquires a negative charge and size of the atom increases.
Since, both Rb and K are same group elements and Rb has larger atomic size than K.
Hence, we can conclude that out of the given options K^{+}
+ has the smallest size.
Answer:
K+
Explanation:
Just took the quiz :)
why is carbon dioxide a green house gas
Answer:
That's because the glass walls of the greenhouse trap the Sun's heat. The greenhouse effect works much the same way on Earth.
Explanation:
Gases in the atmosphere, such as carbon dioxide, trap heat just like the glass roof of a greenhouse. These heat-trapping gases are called greenhouse gases.