Which statement is true for nuclear reactions but not for chemical reactions?
O A. The total number of atoms stays the same throughout the
reaction.
B. The nuclei of the atoms are changed by the reaction.
C. The total mass of the products is the same as the total mass of
the reactants.
D. The nuclei of the atoms stay the same throughout the reaction.
Answers
Answer: B. The nuclei of the atoms are changed by the reaction.
Explanation:
The statement which is true for nuclear reactions but not for chemical reactions is that the nuclei of the atoms are changed by the reaction.
There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus or nuclei respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
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Related Questions
Consider these two entries from a fictional table of standard reduction potentials.
X3++3e−⟶X(s)o=−2.11 V
Y3++3e−⟶Y(s)o=−0.22 V
What is the standard potential of a galvanic (voltaic) cell where X is the anode and Y is the cathode?
ocell=
V
Answers
Answer:
1.89 V
Explanation:
To calculate the standard cell potential, subtract the reduction potential of the anode from the reduction potential of the cathode.
So for your calculation,
-0.22 V - (-2.11 V)= 1.89 V
In the voltaic cell, current is produced by a sponteanous chemical reaction. The standard cell potential here is 1.89 V.
What is a voltaic cell?A voltaic cell is a cell that produces current by a sponteanous chemical reaction. We are told here that X is the anode and Y is the cathode.
Now;
E°cell = E°cathode - E°anode
E°cell = (−0.22 V) - (−2.11 V) = 1.89 V
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Whose ideas were based on scientifically gathered evidence?
A. Aristotle and alchemists
B. Aristotle and John Dalton
C. John Dalton and Marie Curie
D. Marie Curie and alchemists
Answers
Answer:
Maybe c?
Explanation:
John Dalton was an English chemist, and Marie Curie was a physicist and chemist. The ideas of John Dalton and Marie Curie were based on scientifically gathered evidence. Thus, option C is correct.
Who are John Dalton and Marie Curie?John Dalton and Marie Curie are famous physicists and chemists. John Dalton is most known for introducing the theory of the atom and color blindness. He gave the theory of atomism based on the experimental setup.
Marie curie hugely contributed to the discovery of radioactivity and cancer research. She and her husband experimented and searched for the radioactive material.
Aristotle was a philosopher and established the relation between the various fields of sciences. He originated the idea of Alchemy by combining the four elements.
Therefore, John Dalton and Marie Curie proposed ideas based on research.
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1)
Steel Wool Experiment
Before
Observations
After
Observations
Appearance
Steel wool dark gray,
Balloon deflated
Appearance
Steel wool dark
brown; Balloon
inflated
Mass (9)
485.68
Mass (9)
The students data can be seen here. A chemical reaction clearly took
place in the flask. One entry is missing: the mass of the system at the
end of the experiment. What amount should be added to the data
table?
Answers
Answer:
Chemical reactions, chemistry, science as inquiry and data analysis. ... Students burn steel wool in both an open and closed environment to understand ... The difference in mass for this small sample of steel wool will be very small. ... careful attention to the balloon! 9. When rusting occurs the properties of the metal changes.
Explanation:
Which best explains why ionization energy tends to decrease from the top to the bottom of a group? The number of orbitals decreases. The number of neutrons decreases. Electrons get closer to the nucleus. Electrons get farther from the nucleus.
Answers
Answer:
Electrons get farther from the nucleus.
Explanation:
By going from the top to the bottom of a group, the atomic number increases. That would mean that:
The number of orbitals increases, as there are more electrons.A higher atomic number implies an increasing number of neutrons.As there are more electrons, they get farther from the nucleus. The farther an electron is from the nucleus, the easier it is for the electron to be removed from the atom.Ionization energy decreases down the group because electrons get farther from the nucleus hence they are easier to remove.
Ionization energy refers to the energy required to remove an electron from an atom. The ionization energy is a periodic trend that decreases down the group but increases across the period.
The ionization energy decreases down the group because electrons get farther from the nucleus hence they are easier to remove.
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HELP HELP HELP HELP!!!!!!!
Answers
Answer:
About 200 moles water
Explanation:
O2 is the limiting reactant, and it allows for 193.75 moles of water to be produced. Good luck on your assignment!
What is the pH of a solution with [OH-]=0.0004? (Show your work)
NO LINKS
Please help
Answers
Answer:
10.6
Explanation:
We'll begin by calculating the pOH of the solution. This can be obtained as follow:
Concentration of Hydroxide ion [OH¯] = 0.0004 M
pOH =?
pOH = –Log [OH¯]
pOH = –Log 0.0004
pOH = 3.4
Finally, we shall determine the pH of the solution. This can be obtained as follow:
pOH = 3.4
pH =?
pH + pOH = 14
pH + 3.4 = 14
Collect like terms
pH = 14 – 3.4
pH = 10.6
Thus, the pH of the solution is 10.6
calculate the molar mass of sodium carbonate
Answers
Answer:
Explanation:
105.9888 g/mol
Answer:
105.9888 g/mol
Explanation:
You will add both the molar mass of each element multiply by the number of atoms present.
how is the air in tube 4 kept out of contact with the nail
Answers
Answer:
If you ever wonder why nails rust, it's because rusting happens when a metal is exposed to oxygen. The molecules of iron on the surface of the nail exchange atoms with the oxygen in the air and produce a new substance, the reddish-brown ferrous oxide, a.k.a. rust.
Explanation:
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2NH3(g)+3CuO(s)= + 3H2O(I)+N2(g)
If a sample of 51.0g of ammonia's reacted with excess copper oxide, how many moles of nitrogen would be produced?
Answers
Answer:
1.50 mol N₂
Explanation:
Step 1: Write the balanced equation
2 NH₃(g) + 3 CuO(s) ⇒ 3 Cu + 3 H₂O(I) + N₂(g)
Step 2: Calculate the moles corresponding to 51.0 g of NH₃
The molar mass of NH₃ is 17.03 g/mol.
51.0 g × 1 mol/17.03 g = 2.99 mol
Step 3: Calculate the moles of N₂ produced from 2.99 moles of NH₃
The molar ratio of NH₃ to N₂is 2:1. The moles of N₂ produced are:
2.99 mol NH₃ × 1 mol N₂/2 mol NH₃ = 1.50 mol N₂
20 POINTS PLEASE ANSWER
In the following reaction, if you wanted to produce more hydrochloric acid (HCl), what should you do? (2 points)
4HCl + O2 ⇄ 2H2O + Cl2
Select one:
a. Add more H2O
b. Add more O2
c. Remove H2O
d. Remove Cl2
Answers
Answer:
Add more H2O
Explanation:
what is the acceleration of a 100kg object being pushed with a force of 1000 newton's
Answers
Answer:
the person that answered it with the link, dont click it's a virus
Explanation:
The fluorine-17 nuclide radioactively decays by electron capture.
Answers
Answer: daughter nucleus is Oxygen-17
Explanation: electron and proton form a neutron in nucleus.
Mass number remains same and number of proton decreases.
Fluorine -17 isotope undergoes nuclear decay by electron capture results in the formation of the oxygen-17 nuclei and one neutron as written below:
[tex]\rm _{9}^{17}F + _{-1}^{0}e \rightarrow _{9}^{1 7}O + _{0}^{1}n[/tex]
What is nuclear decay?Unstable radioactive isotopes of some elements undergoes breaking their nuclei by emitting or absorbing some charged particles such as alpha or beta.
Alpha decay result in the emission of one helium nuclei where, the mass number reduces by 4 units and atomic number by 2. In beta decay mass umber does not change but atomic number increases by one.
The process of electron capture, is the bombardment of an electron into the unstable nucelli result where the atomic number reduces by one. Therefore, fluorine converts to oxygen -17 by electron capture where the latter isotope is stable one.
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Your question is incomplete. But your complete question probably was:
Fluorine-17 nuclide radioactively decays by electron capture. Write a balanced nuclear chemical equation that describes this process.
Explain Lewis electron dot formula of H, O, N, H2, O2, and N2
Answers
Answer:
For a hydrogen atom, H which has only one valence electron, the Lewis electron dot formula is with a single dot on the H atom.
For oxygen atom which has six valence electrons, the Lewis electron dot formula is shown with six dots around the O atom
For nitrogen atom with five valence electrons, the Lewis electron dot formula is shown with five dots around the N atom
For the hydrogen gas molecule, the Lewis electron dot formula is shown with two dots between the two H atoms which represents the bonding electrons.
For the oxygen gas molecule, the Lewis electron dot formula is shown with four dots between the two O atoms which represents the bonding electrons, and four other dots on each atom which represents the non-bonding electrons
For the nitrogen gas molecule, the Lewis electron dot formula is shown with six dots between the two N atoms which represents the bonding electrons, and two other dots on each atom which represents the non-bonding electrons
Explanation:
Lewis electron dot structures are structural formulas for molecules and polyatomic ions that represent all valence (outermost shell electrons involved in bonding with other atoms of the same or different elements) electrons in an atom of an element. It shows the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule. These electrons are represented with dots around the atom, thus the name Lewis electron dot formula.
The Lewis electron dot formula for the given atoms and molecules are explained below:
For a hydrogen atom, H which has only one valence electron, the Lewis electron dot formula is with a single dot on the H atom.
For oxygen atom which has six valence electrons, the Lewis electron dot formula is shown with six dots around the O atom
For nitrogen atom with five valence electrons, the Lewis electron dot formula is shown with five dots around the N atom
For the hydrogen gas molecule, the Lewis electron dot formula is shown with two dots between the two H atoms which represents the bonding electrons.
For the oxygen gas molecule, the Lewis electron dot formula is shown with four dots between the two O atoms which represents the bonding electrons, and four other dots on each atom which represents the non-bonding electrons
For the nitrogen gas molecule, the Lewis electron dot formula is shown with six dots between the two N atoms which represents the bonding electrons, and two other dots on each atom which represents the non-bonding electrons
what blood vessels and chambers of the heart does a red blood cell pass as it delivers oxygen from the lungs to the brain and return to be oxygenated again.
Answers
Answer:
capillaries
Explanation:
hope it helps if I'm not tell me right away.
Answer:
Carotid artery, Jugular veins
The chambers are explained below.
Explanation:
THE BLOOD VESSELS
The carotid artery carries red blood (oxygenated) to the head and the neck region and that obviously include the brain via the aorta. To be precise the internal carotid artery supplies oxygenated red blood cells to brain. The jugular veins carry deoxygenated red blood cells from the head back to the heart via the superior vena cava. The most important function of the jugular vein is to drain deoxygenated blood from brain.
THE CHAMBERS
The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle which also pumps the same oxygenated blood to the rest of the body through the aortic valve (aorta).
The right atrium receives deoxygenated blood from the body via the vena cava and pumps the deoxygenated blood to the right ventricle which pumps the deoxygenated blood to be oxygenated by the lungs via the pulmonary valve (pulmonary artery).
CONCLUSION
The oxygenated red blood cells from the lung pass through the pulmonary vein through the left atrium to the left ventricle through the carotid artery (internal carotid artery) via the aorta to the brain and
The deoxygenated red blood cells in the brain are drained through the jugular vein via the superior vena cava to the right atrium, which pumps the deoxygenated blood to the right ventricle. From here the deoxygenated blood is pumped to the lungs via the pulmonary artery for oxygenation.
This is my answer, thus if I got your question right.
what is ionisation energy
Answers
Answer:
minimum energy required to to remove the most loosely bound election of an isolated gaseous atom.
Explanation:
PLEASE HELP !! ILL GIVE BRAINLIEST !! 100 POINTS
IF YOU KNOW CHEMISTRY OR BIOLOGY
Answers
As CaCl2 dissolves in water, and warms the solution,
a. delta H is positive, and delta S is negative
b. delta H is negative, and delta S is negative
c. delta H is negative, and delta S is positive
d. delta H is positive, and delta S is positive
Answers
As [tex]CaCl_{2}[/tex] dissolves in water, and warms the solution, delta H is negative, and delta S is positive.
What are exothermic and endothermic reactions?Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products which is used to break the bonds in the reactants. Chemical reactions that absorb (or use) energy are called endothermic.
The dissociation of [tex]CaCl_{2}[/tex] in water is
[tex]CaCl_{2}+H_{2}O(l)=Ca_{++}+2Cl_{-}+H_{2}O(l)[/tex]
As the solution is warm, change in Enthalpy is exothermic ΔH < 0.
(ΔH is negative, so the dissociation is exothermic).
As there are produced 2 ions from 1 solid molecule, the disorder is increasing and ΔS > 0
Hence, option C is correct.
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Please help with completing number 5
Answers
Answer:
D.
Explanation:
NH3 (Ammonia) is a water soluble gas, and is polar. While C6H14 is non-polar and does not mix with water soluble.
HELP PLEASE
The blank
and the blank
of atoms are the same on both sides of a chemical equation.
Answers
Answer:
which states that matter cannot be created or destroyed. Therefore, there must be the same number of atoms of each element on each side of a chemical equation.
Explanation:
help help help help
Answers
Answer:
2,4,6–trimethylheptanal
Explanation:
To name the compound given, we must first obtain the following:
1. Determine the functional group of the compound.
2. Determine the longest continuous carbon chain. This gives the parent name of the compound.
3. Identify the substituent group attached to the compound.
4. Locate the position of the substituent group.
5. Combine the above to obtain the name of the compound.
Now, we shall name the compound as follow:
1. The functional group of the compound is –CHO. Thus, the compound is an alkanal.
2. The longest continuous carbon chain is 7. Thus, the parent of the compound is heptanal.
3. The substituent group attached to the compound is methyl (–CH₃).
NOTE: There are 3 methyl groups attached to the compound.
4. The methyl groups attached to compound are located at carbon 2, 4 and 6.
5. Therefore, the name of the compound is:
2,4,6–trimethylheptanal
When 565g of a metal with temperature of 90.00 C added to 200.0 g of water at 25.00 degrees. Assuming all the heat lost by the iron is transferred to the water ( specific heat capacity of water = 4/18 J/(g-C)), and the final temperature of the mixture is 34.40 degree Celsius what is the heat capacity of the metal?
Answers
Answer:
The specific heat is 0.25J/g°C
Explanation:
To solve this question we must know that the heat released for the metal is equal to the heat absorbed for the water. The equation is:
S(Metal)*m(Metal)*ΔT(metal) = S(water)*m(water)*ΔT(water)
Where S of metal is our incognite (Specific heat of metal)
m is the mass of the metal = 565g
ΔT is change in heat of the metal = 90.00°C - 34.40°C = 55.60°C
Specific heat of water = 4.18J/g°C
The mass of water = 200.0g
ΔT of water is 34.40°C - 25.00°C = 9.40°C
Replacing:
S(Metal)*565g*55.60°C = 4.18J/g°C*200.0g*9.40°C
S(metal) = 0.25J/g°C
The specific heat is 0.25J/g°C
Someone please help !!!!!
Sodium chromate can be prepared by oxidizing a chromium(III) salt with sodium peroxide in alkaline
solution. The chromium(III) ions are oxidized to chromate ions. The peroxide ions are reduced to hydroxide
ions. Write down unbalanced half reaction equations and a balanced overall equation for the reaction.
The physical states of all the reagents and products must be shown throughout.
Answers
Here's link to the answer:
bit.[tex]^{}[/tex]ly/3a8Nt8n
What combinations of up and down did quarks combine to make the proton?
A. Down + down + down
B. Up+Up+ down
C. Up+Up+Up
D. Up+down+down
E. Up+down
Answers
Answer:
it is b
Explanation:
b is the quarks for a proton
Answer:
B
Explanation:
In this reaction diagram, which part represents the difference in energy
between the reactants and the products?
Potential energy
HA
Reaction progress
Answers
Answer:
Option D. G
Explanation:
In the energy profile diagram, the difference in the energy between reactant and product is called enthalphy Change (ΔH).
Mathematically, the enthalpy change (ΔH) is represented as:
Enthalpy change (ΔH) = Heat of product (Hₚ) – Heat of reactant (Hᵣ)
ΔH = Hₚ – Hᵣ
Considering the diagram given in question above, the difference in the energy of product and reactant is indicated by the letter G
Thus, option D gives the correct answer to the question.
Calculate mass in grams in 2.28 mol of h2so4
Answers
Answer:
224g
Explanation:
Molar mass of h2so4:
1.008x2+32.06+16.00x4=98.08g/mol
2.28 x 98.08=224g
Consider an atom that has an electron in an excited state. The electron falls to a lower energy level. What effect does that have on the electron?
Answers
Answer:
On returning to lowest energy state which is stable, it releases energy in the form of light. Hence, option A that is the electron releases energy in the form of light on falling to lower energy state from excite state.
Consider the following reaction
X + Al(NO3)3 (aq) → X(NO3)y (aq) + Al(s)
Using the provided Activity Series of Elements, determine which of the following elements could be X.
a. Copper b. Lead c. Iron d. Calcium
Answers
Answer: Calcium
Explanation: an element need to reduce Iron in reaction.
Calcium is only metal in list which can reduce Iron
What is the meaning of a null hypothesis being rejected?
The hypothesis is definitely correct.
The hypothesis might be correct.
The hypothesis is false.
The null hypothesis is correct.
Answers
Answer:
the hypothesis is false
Explanation:
it I rejected because the hypothesis has been tested severally and the answer still proves to be wrong
Answer:
probably the third option: The hypothesis is false
Explanation:
For lunch today, I ate an apple. What type of carbohydrate did I ingest?
Answers
Answer:
Monosaccharide
Explanation:
Apples contain high levels of fructose, which is a monosaccharide.
1 point C3Hg(g) + 5 O2(g) → 3 CO2(g) + 4H2O(g)
If 0.678 g of propane (C3Hg) are used in the reaction, how many liters of oxygen gas are required to react completely at STP?
Molar mass of C3Hg = 44.11 g/mol
0.077 L
1.72 L
75.9L
0.015L
Answers
Answer: 1.72
Explanation: