Answer:
may involve a change in total mass
involve very high-energy changes
involve changes in nuclides when decay occurs
Explanation:
A nuclear reaction is different from a typical chemical reaction. The reaction occurs within the nucleus and involved nuclear materials.
Most nuclear reactions involves a change in mass due to the attenuation of the nuclear materials. Mass is converted to energy in nuclear reactions. Nuclear reactions are usually very high energy processes and they release a significant amount of energy. The nuclide changes as new atoms are formed by the process.The isotope 238U, which starts one of the natural radioactive series, decays first by alpha decay followed by two negative beta decays. At this point, what is the resulting isotope
Answer: The resulting isotope is [tex]^{231}_{92}\textrm {U}[/tex]
Explanation:
Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.
[tex]^{235}_{92}\textrm{U} \rightarrow ^{231}_{90}\textrm {Th}+^{4}_{2}n[/tex]
Beta Decay : It is a type of decay process, in which a proton gets converted to neutron and an electron. This is also known as -decay. In this the mass number remains same but the atomic number is increased by 1.
[tex]^{231}_{90}\textrm{Th}\rightarrow ^{231}_{92}\textrm {Th}+2^{0}_{-1}n[/tex]
The resulting isotope is [tex]^{231}_{92}\textrm {U}[/tex]
Hydrogen bonds are formed between molecules when hydrogen is covalently bonded to an element that has a
1
small atomic radius and low electronegativity
2
large atomic radius and low electronegativity
3
small atomic radius and high electronegativity
4
large atomic radius and high electronegativity
Submit Answer
Answer:
choice 3
Explanation:
Hydrogen bonding occurs when a H is bonded to a highly electronegative atom like F. Towards the upper right corner, most atoms have high electronegativity and small atomic radii, according to periodic trends.
Please give thanks :)
Hydrogen is covalently bonded to an element that has a small atomic radius and high electronegativity.
• An intermolecular attractive force in which an atom of hydrogen, which is bonded covalently to a small, highly electronegative atom is known as a hydrogen bond.
• Hydrogen bonds are very strong in comparison to other dipole interactions.
• A typical hydrogen bond exhibits a strength of about 5 percent of that of a covalent bond.
• Hydrogen bonding takes place only in molecules where hydrogen bonding is bonded covalently to one of the three elements, that is, oxygen, fluorine, or nitrogen.
Thus, correct answer is option 3.
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How many moles of N2O5 are needed
to produce 7.90 g of NO2?
Answer:
0.085 moles of N₂O₅ are needed
Explanation:
Given data:
Mass of NO₂ produces = 7.90 g
Moles of N₂O₅ needed = ?
Solution:
2N₂O₅ → 4NO₂ + O₂
Number of moles of NO₂ produced :
Number of moles = mass/ molar mass
Number of moles = 7.90 g/ 46 g/mol
Number of moles = 0.17 mol
now we will compare the moles of NO₂ with N₂O₅.
NO₂ : N₂O₅
4 : 2
0.17 : 2/4×0.17 = 0.085 mol
Thus, 0.085 moles of N₂O₅ are needed.
Methylcycohexane has a cyclic compound of 7 Carbons
True or
False
Answer:
True
Explanation:
Methylcyclohexane has a cyclic compound of 7 carbons false classified as Saturated Hydrocarbon.
Farmers breed cows to produce high amounts of milk. This is an example of...
A. natural selection
B. variation in species
C. selective breeding
D. inbreeding
a mountain
b trench
c mid ocean range
Which of the following is NOT true about comparisons between analog and digital signals?
Question 3 options:
Digital signals are pulses of voltage that switch currents on an off in devices like computers.
Analog signals are used to convert sound waves into electronic signals.
Digital signals are more prone to distortion.
Analog signals are more prone to distortion.
Answer:
Analog signals are used to convert sound waves into electronic signals.
Explanation:
i think i hope i helped :))
how is your day going?
Answer
B
Explanation:
I did this quiz and i think i got it right Good luck!
Complete the passage about the properties of ionic compounds.
It is difficult to break the lonic bonds in a compound because of the________
room temperature because they have_________
Answer:
Following are the solution to the given question:
Explanation:
Due to the strong attachment among ions, it's indeed hard to break the covalent compounds in a combination. The ionic compounds, as they have a great melting point, become solid at room temperature, and may we say that the stronger between both the ions, as it is on a high point of fusion, is quite desirable.
A metal ball and beaker of water are at room temperature. The ball is heated and immediately placed in the water. Which statement describes the energy transfers as the ball and the beaker of water approach thermal equilibrium?
A. The energy gained by the water will equal the energy lost by the surroundings.
B. The energy lost by the water and the cube will equal the energy lost by the surroundings.
C. The energy lost by the cube will equal the energy gained by the water and the surroundings.
There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, the correct option is option A.
What is energy transfer in thermodynamics?Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.
Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. The energy gained by the water will equal the energy lost by the surroundings.
Therefore, the correct option is option A.
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In the elimination reaction of 1-bromo-2-ethylcyclohexane in sodium hydroxide in ethanol solution A) is faster for the trans isomer since the bromine and ethyl group are of different sides of the ring. B) is faster for the trans isomer since the bromine and the ethyl groups are both axial. C) is faster for the trans isomer since the bromine and the ethyl groups are both equitorial. D) is faster for the trans isomer since there is a hydrogen anti-periplanar to the bromine in the preferred chair conformer of the compound. E) None of the above provides a correct response.
Answer:
D
Explanation:
Option D is correct
Cycloalkanes(1-bromo 2-ehtyl cyclohexane is this case) mainly preferred chair conformers while undergoing elimination reaction and further products are not those that predicted by zaitsev's rule.
Hence, the correct answer is faster for the trans isomer since there is a hydrogen anti-periplanar to the bromine in the preferred chair conformer of the compound.
The molecules in a solid do not move.
True
False
Answer:
True
Explanation:
Solid molecules don't move.
Molecule of a solid are tightly packed there is no space between them so there is no movement of the molecule.
The particles (atoms or molecules) are attracted to each other. The particles (atoms or molecules) vibrate but do not move past one another. The solid retains its shape.
true
MCQ
A sample of tungsten occupies a volume of 1.6 cm3. How many atoms of
tungsten in the sample? (For tungsten, density = 19.35 g/cm3)
O 61.92
O 0.337
2.03X10^23
O 1.014X1023
5.07X10^22
O 2.54X10-22
Answer:
1.014×10²³ atoms
Explanation:
Given data:
Volume of tungsten = 1.6 cm³
Density of tungsten = 19.35 g/cm³
Number of atoms of tungsten = ?
Solution:
First of all we will calculate the mass of tungsten.
density = mass/volume
by putting values,
19.35 g/cm³ = mass/1.6 cm³
Mass = 19.35 g/cm³× 1.6 cm³
Mass = 30.96 g
Number of moles of tungsten:
Number of moles = mass/molar mass
Number of moles = 30.96 g/ 183.84 g/mol
Number of moles = 0.1684 mol
1 mole contain 6.022×10²³ atoms.
0.1684 mol × 6.022×10²³ atoms / 1mol
1.014×10²³ atoms
Which of the following could form an ionic bond with an anion?
Hg22+
NO2–
SO32–
Ar
Answer:
the correct answer is A, Hg22+ on edge 2020
Explanation:
i took the review
The only cation that can form an ionic bond with an anion in the list is Hg22+.
The term "anion" refers to a negatively charged ion. An ionic bond is a kind of bond that is formed between an anion and a cation. As a result, ionic compounds are actually an ion pair.
If we look at the options closely, the only cation that can form an ionic bond with an anion in the list is Hg22+.
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if the Chemical Reaction bellow started out with a total mass of 45 grams, what would be the total mass of the products?
2Na + 2H2O ---> 2 NA OH + H2
Answer:
When 45 gram of total mass of reactant react 45 gram of product will also produced
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
In a similar way,
2Na + 2H₂O → 2NaOH + H₂
45 g = 45 g
when 45 gram of total mass of reactant react 45 gram of product will also produced. (2NaOH + H₂ = 45 g)
Describe how you would prepare 5.00 × 102 mL of a 1.75 M H2SO4 solution, starting with an 8.61 M stock solution of H2SO4
We prepare the volume of the 8.61 M stock solution of 0.102 L, then we dilute it by adding water to 0.5 L
Further explanationGiven
5.00 × 10² mL of a 1.75 M H₂SO₄ solution
8.61 M stock solution
Required
The volume of stock solution
Solution
Molarity from 8.61 M to 1.75 M ⇒Dilution
We can use dilution formula :
[tex]\tt \boxed{\bold{M_1.V_1=M_2.V_2}}[/tex]
M₁=8.61 M
V₂=500 ml = 0.5 L
M₂=1.75 M
[tex]\tt V_1=\dfrac{M_2.V_2}{M_1}\\\\V_1=\dfrac{1.75\times 0.5}{8.61}\\\\V_1=0.102~L[/tex]
Which of the following would be most useful in trying to obtain procedural information to replicate an experiment previously published?
Answer:
Peer-reviewed Journal Article
Explanation:
1.Dictionary
2.Encyclopidia
3.Internet Search Engine
4.Peer-reviewed Journal Article
The correct answer as to which would be most useful in trying to obtain procedural information to replicate an experiment previously published would be a peer-reviewed journal article.
A peer-reviewed journal article is a journal article written by an expert or experts on a particular topic and has undergone thorough reviews by experts in the same field and certified to be of good-enough standards to be published.
Such an article would contain all the necessary information relating to the experiment leading to the article. Hence, in order to obtain procedural information to replicate an experiment that has been previously published, a peer-reviewed journal published on the same topic would do be the right place to seek.
Question 21 of 25
What is the oxidation state of Cl in HCIO4?
O A. +7
OB. -3
O c. -1
D. +8
Answer:
7
Explanation:
If the positive end of a water molecule were to encounter the surface shown above, what might happen to the surface’s negative charges? Explain your reasoning.
Answer:
The negative charges of the surface will be attracted to the positive ends of the water molecule
Explanation:
A water molecule is a polar molecule. This means that the two ends of a water molecule are oppositely charged with one end being positive and the other end being negative.
When the positive end of a water molecule encounters a surface as shown in the attachment, where positive and negative charges are evenly distributed at rest, with the negative charges free to move, the negative charges will be attracted to the positive end of the water molecule due to the principle of electrostatics which states that unlike charges attract, while like charges repel. This means that negative and positive charges are attracted to each other while positive and positive or negative and negative charges are repelled from each other. Therefore, the water molecule will adhere to the surface because of the attraction between opposite charges.
The unlike charges will attract as expected based on the laws of electrostatics.
According to the laws of electrostatics, like charges repel while unlike charges attract. We are told in the question that water is a polar molecule with a positive and a negative end.
If the positive end of water dipole approaches the negative charges on the surface, the unlike charges will attract as expected based on the laws of electrostatics.
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Describe the motion of particles in a liquid as it freezes.
Answer:
The particles in a liquid as it freezes slow down.
Explanation:
This is because heat is energy and when there is less heat, there is less energy causing the particles to slow down.
What is the molarity of a solution of 4.50 g
of NH4Br in enough H2O to make 213 mL of
solution?
Answer in units of M.
Answer:
M = 0.23 M
Explanation:
Given data:
Molarity of solution = ?
Mass of NH₄Br = 4.50 g
Volume of solution = 213 mL (213 mL× 1L /1000 mL = 0.213 L)
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of NH₄Br:
Number of moles = mass/molar mass
Number of moles = 4.50 g / 97.94 g/mol
Number of moles = 0.05 mol
Molarity:
M = 0.05 mol/ 0.213 L
M = 0.23 M
1×66÷3×6666666666666
Answer: 1.4666667e+14
Explanation:
If you have 23.8g of CaCl2, how many formula units is it
Answer:
1.3×10²³ formula unit
Explanation:
Given data:
Mass of CaCl₂ = 23.8 g
Number of formula unit = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 23.8 g/110.98 g/mol
Number of moles = 0.21 mol
1 mole of any substance contain 6.022×10²³ formula unit
0.21 mol × 6.022×10²³ formula unit / 1mol
1.3×10²³ formula unit
An atom gains two electrons. What is the overall charge now?
HURRY NEED NOW! Calcium has a charge of +2. The chart lists the charges of different ions.
Which are possible equations for an ionic compound with calcium?
CaO, CaMg, or CaF2
Ca2Cl, CaNa, or CaP
CaF, CaMg, or CaNa
CaO, CaF2, or CaCl2
Answer:
CaO, CaF2, or CaCl2
Explanation:
In an ionic compound, the charges need to balance out. This is the only set of compounds that fits this criteria.
Answer:
CaO CaF2 CaCl2 are ionic
Explanation:
Because electronegativity difference between calcium and other atom is more than 1.7
`Suppose you have a sample of NaOH (0.0315 L, to be exact). If this amount of NaOH is used to exactly titrate 0.0250 L of HCl that has a concentration of 0.105 M, what is the molarity of the NaOH? HINT: Remember to first get your balanced equation.
Answer:
0.0835 M
Explanation:
Step 1: Write the balanced equation
NaOH + HCl ⇒ NaCl + H₂O
Step 2: Calculate the reacting moles of HCl
0.0250 L of 0.105 M HCl react.
0.0250 L × 0.105 mol/L = 2.63 × 10⁻³ mol
Step 3: Calculate the reacting moles of NaOH
The molar ratio of NaOH to HCl is 1:1. The reacting moles of NaOH are 1/1 × 2.63 × 10⁻³ mol = 2.63 × 10⁻³ mol.
Step 4: Calculate the molarity of NaOH
2.63 × 10⁻³ moles of NaOH are in 0.0315 L of solution.
M = 2.63 × 10⁻³ mol / 0.0315 L = 0.0835 M
Alice and Bob are experimenting with two moles of neon, a monatomic gas, that starts out at conditions of standard temperature and pressure (273.15 K, 105 Pa). Alice heats the gas at constant volume until its pressure is doubled, then Bob further heats the gas at constant pressure until its volume is doubled. If Alice and Bob assume that neon behaves as an ideal gas, then how much heat have they added to the gas for the entire process.
Answer:
29273.178 joules have been added to the gas for the entire process.
Explanation:
The specific heats of monoatomic gases, measured in joules per mol-Kelvin, are represented by the following expressions:
Isochoric (Constant volume)
[tex]c_{v} = \frac{3}{2}\cdot R_{u}[/tex] (1)
Isobaric (Constant pressure)
[tex]c_{p} = \frac{5}{2}\cdot R_{u}[/tex] (2)
Where [tex]R_{u}[/tex] is the ideal gas constant, measured in pascal-cubic meters per mol-Kelvin.
Under the assumption of ideal gas, we notice the following relationships:
1) Temperature is directly proportional to pressure.
2) Temperature is directly proportional to volume.
Now we proceed to find all required temperatures below:
(i) Alice heats the gas at constant volume until its pressure is doubled:
[tex]\frac{T_{2}}{T_{1}} = \frac{P_{2}}{P_{1}}[/tex] (3)
([tex]\frac{P_{2}}{P_{1}} = 2[/tex], [tex]T_{1} = 273.15\,K[/tex])
[tex]T_{2} = \frac{P_{2}}{P_{1}} \times T_{1}[/tex]
[tex]T_{2} = 2\times 273.15\,K[/tex]
[tex]T_{2} = 546.3\,K[/tex]
(ii) Bob further heats the gas at constant pressure until its volume is doubled:
[tex]\frac{T_{3}}{T_{2}} =\frac{V_{3}}{V_{2}}[/tex] (4)
([tex]\frac{V_{3}}{V_{2}} = 2[/tex], [tex]T_{2} = 546.3\,K[/tex])
[tex]T_{3} = \frac{V_{3}}{V_{2}}\times T_{2}[/tex]
[tex]T_{3} = 2\times 546.3\,K[/tex]
[tex]T_{3} = 1092.6\,K[/tex]
Finally, the heat added to the gas ([tex]Q[/tex]), measured in joules, for the entire process is:
[tex]Q = n\cdot [c_{v}\cdot (T_{2}-T_{1})+c_{p}\cdot (T_{3}-T_{2})][/tex] (5)
If we know that [tex]R_{u} = 8.314\,\frac{Pa\cdot m^{3}}{mol\cdot K}[/tex], [tex]n = 2\,mol[/tex], [tex]T_{1} = 273.15\,K[/tex], [tex]T_{2} = 546.3\,K[/tex] and [tex]T_{3} = 1092.6\,K[/tex], the heat added to the gas for the entire process is:
[tex]c_{v} = \frac{3}{2}\cdot \left(8.314\,\frac{Pa\cdot m^{3}}{mol\cdot K} \right)[/tex]
[tex]c_{v} = 12.471\,\frac{J}{mol\cdot K}[/tex]
[tex]c_{p} = \frac{5}{2}\cdot \left(8.314\,\frac{Pa\cdot m^{3}}{mol\cdot K} \right)[/tex]
[tex]c_{p} = 20.785\,\frac{J}{mol\cdot K}[/tex]
[tex]Q = (2\,mol)\cdot \left[\left(12.471\,\frac{J}{mol\cdot K} \right)\cdot (536.3\,K-273.15\,K)+\left(20.785\,\frac{J}{mol\cdot K} \right)\cdot (1092.6\,K-546.3\,K )\right][/tex]
[tex]Q = 29273.178\,J[/tex]
29273.178 joules have been added to the gas for the entire process.
A chemist measures the amount of oxygen gas produced during an experiment. She finds that of oxygen gas is produced. Calculate the number of moles of oxygen gas produced. Be sure your answer has the correct number of significant digits.
Answer:
This question is incomplete. A fragment of the question is missing. The fragment is:
She finds that 4.87 g of oxygen gas is produced
0.152 moles
Explanation:
Using the formula: mole = mass / molar mass
According to the question, a chemist measures the amount of oxygen gas produced during an experiment. Oxygen gas has the chemical formula: O2. Hence, the molar mass will be:
O2 = 16(2) = 32g/mol
If the mass of the oxygen gas to be 4.87 g of oxygen gas.
Therefore,
moles = 4.87/32
moles = 0.152mol
What are two dangers associated with
nuclear fission?
Answer:
Nuclear energy produces radioactive waste
A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years
Explanation:
What is the product in this reaction? What are its properties
Answer:
In a chemical reaction, substances (elements and/or compounds) called reactants are changed into other substances (compounds and/or elements) called products. You can’t change one element into another in a chemical reaction — that happens in nuclear reactions. Instead, you create a new substance with chemical reactions.
In general terms, a chemical reaction follows this format:
Reactants→Products
For example, take a look at the reaction that occurs when you light your natural gas range. Methane (natural gas) reacts with the oxygen in the atmosphere to produce carbon dioxide and water vapor. The chemical equation that represents this reaction is written like this:
Methane and oxygen (oxygen is a diatomic — two-atom — element) are the reactants, while carbon dioxide and water are the products.
Explanation:
In the given incomplete chemical reaction, the product formed are [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex], respectively.
Product is the final result in a chemical reaction where reactants react to produce new substance.
The complete balanced reaction for the given reaction is expressed as:
[tex]\rm CH_4+2O_2\rightarrow CO_2 + 2H_2O[/tex]
In this reaction, methane undergoes combustion reaction in presence of oxygen to produce [tex]\rm CO_2[/tex] and [tex]\rm H_2O[/tex] as the final product.
Properties of the final products are:
[tex]\rm CO_2[/tex] (carbon dioxide) is a colorless, odorless gas that is denser than air. It is non-flammable, non-toxic, and does not support combustion. It is a greenhouse gas, which means that it contributes to global warming and climate change.
Water is a colorless, odorless, and tasteless liquid that is essential for life. It helps in various metabolic process taking place within human body.
Therefore, the complete and balanced equation for provide equation with final product is [tex]\rm CH_4+2O_2\rightarrow CO_2 + 2H_2O[/tex].
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The given question is incomplete. The complete question is:
What is the product in this reaction: [tex]\rm CH_4+2O_2\rightarrow[/tex]? What are its properties?
Proton-proton chain reaction is:
O The destruction of energy due to lost atoms
The creation of energy through the process of nuclear fusion
The sharing of energy through radioactive zone
O The decline of energy due to a solar eclipse
★Plato/Edmentum users★
The creation of energy through the process of nuclear fusion. ✔
Have a good day fellow cheaters :)♡
Answer:
B
Explanation: