Answers
Answer: Please find answer in explanation column
Explanation:
During radioactive decay, the __unstable ________ isotope decays into a _stable ___________ isotope that has a different ____proton _______________ number
Or
During radioactive decay, the _ unstable parent nuclide ________ isotope decays into a _stable daughter nuclide ___________ isotope that has a different ____proton _______________ number.
There are 3 types of radioactive decay;alpha, beta and gamma, Of which the above clearly explains the beta decay. In beta decay, the unstable isotope having excess neutrons will undergo a beta decay emitting a beta particle.( ⁰₋₁e) causing the nucleus to loose a neutron but gain a proton.
Some heavy unstable isotopes which undergo radioactive (beta decay ) to become stable isotopes are phosphorus-32, strontium-90, iodine-131
Using Strontium 90 as an example , we have
⁹⁰₃₈St ----->⁹⁰₃₉Y + ⁰₋₁e
Strontium an unstable isotope undergoes a beta radioactive decay to form Yttrium.
Related Questions
Starting with 0.3500 mol CO(g) and 0.05500 mol COCl2(g) in a 3.050 L flask at 668 K, how many moles of CI2(g) will be present at equilibrium?
CO(g) + Cl2(g)》COCl2(g)
Kc= 1.2 x 10^3 at 668 K
Answers
At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
1: Write the balanced chemical equation:
\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)
2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.
Initial:
\(C_O\)(g) = 0.3500 mol
\(Cl_2\)(g) = 0.05500 mol
\(C_OCl_2\)(g) = 0 mol
Change:
\(C_O\)(g) = -x
\(Cl_2\)(g) = -x
\(C_OCl_2\)(g) = +x
Equilibrium:
\(C_O\)(g) = 0.3500 - x mol
\(Cl_2\)(g) = 0.05500 - x mol
\(C_OCl_2\)(g) = x mol
3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:
Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]
4: Substitute the given equilibrium constant (Kc) value into the expression:
1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)
5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:
1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x
6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.
7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.
8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):
\(Cl_2\)(g) = 0.05500 - x
9: Calculate the value of \(Cl_2\)(g) at equilibrium:
\(Cl_2\)(g) = 0.05500 - x
\(Cl_2\)(g) = 0.05500 - (positive value of x)
10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.
Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.
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Will give out brainiest for best answer giving 15 pts
Answers
Which element does this atom represent?
Answers
Answer:
Option C is correct = fluorine
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
This diagram show that there are 9 electrons and 9 protons are present. We know that the number of protons or electrons are atomic number of that element. From periodic table we know that atomic number of fluorine is 9 thus the given atom present fluorine atom.
In the image below if the frisbee represents lights, what does the fence represent?
Answers
Answer:
The atmosphere
Explanation:
It reflects and traps the light outside of the Earth's Atmosphere?
I think, hope i helped.
Convert 76.78 g of CO2 to a volume.
Answers
Earth is surrounded by an envelope of gases called the
Answers
how many moles of o2 are needed to produce 34.7g of fe203
Answers
Answer:
5.09 moles of Fe is required to react with 3.82 moles of O₂.
0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.
Reaction stoichiometry
In first place, the balanced reaction is:
4 Fe + 3 O₂ → 2 Fe₂O₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Fe: 4 moles
O₂: 3 moles
Fe₂O₃: 2 moles
The molar mass of the compounds is:
Fe: 55.85 g/mole
O₂: 32 g/mole
Fe₂O₃: 159.7 g/mole
Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Fe: 4 moles ×55.85 g/mole= 223.4 grams
O₂: 3 moles ×32 g/mole= 96 grams
Fe₂O₃: 2 moles ×159.7 g/mole= 319.3 grams
Moles of Fe needed
The following rule of three can be applied: If by stoichiometry of the reaction 3 moles of O₂ react with 4 moles of Fe, 3.82 moles of O₂ react with how many moles of Fe?
moles of Fe= 5.09 moles
Finally, 5.09 moles of Fe is required to react with 3.82 moles of O₂.
Moles of O₂ needed
The following rules of three can be applied: If by reaction stoichiometry 319.3 grams of Fe₂O₃ are formed from 3 moles of O₂, 34.7 grams of Fe₂O₃ are formed from how many moles of O₂?
moles of O₂= 0.326 moles
Finally, 0.326 moles of O₂ are needed to produce 34.7 grams of Fe₂O₃.
Explanation:
The diagram below shows the location of three stars in space.Three stars in space, Star 1 is on the far left, Star 2 is to it's right, Star 3 is to the left of Star 2, the distance between Star 2 and Star 3 is little further than the distance between Star 1 and Star 2.Star 3 is 138 light years away from Star 1 and 75 light years away from Star 2. Which of these conclusions about the stars is correct? (2 points)Group of answer choicesStar 2 is 213 miles away from Star 3.Star 2 is 63 kilometers away from Star 3.The light from Star 2 reaches Star 1 in 63 years.The light from Star 2 reaches Star 1 in 213 years.
Answers
Answer:
(c) Light from star 2 reaches star 1 in 63 years
Explanation:
You want to know the correct conclusion given three stars lie in a line and the distances from Star 3 to Star 2 and Star 1 are 138 light years and 75 light years, respectively. Star 2 is closer to Star 1 than to Star 3.
GeometryThe way the question and answer choices are written suggests the sum of distances between 1 and 2 and between 2 and 3 is the distance between 1 and 3. That is, the distance between Star 1 and Star 2 is ...
1 to 2 = (1 to 3) - (2 to 3) = 138 ly - 75 ly = 63 ly
The light from Star 2 reaches Star 1 in 63 years.
__
Additional comment
Units of miles and kilometers are irrelevant when it comes to distances between stars. Since 2 is closer to 1 than to 3, it means the distance from 1 to 2 cannot be greater than 75 ly, so cannot be 213 light years.
In an IR spectra the X axis is wavenumber of the IR radiation which is another way to describe the _____________ of the radiation. There is a direct correlation between wavenumber and energy, thus the higher the wave number the __________ the energy The Y axis is ______ which is a measure of the light that makes it through the sample to the detector. Light that does not make it through the sample to the detector is _____________ by a functional group in the molecule and converted to___________
Answers
Answer:
Energy, more.
Explanation:
wavenumbers are directly proportional to energy and frequency of the radiation means that if one increases the other automatically increases whereas one decreases the other is also decreases. If the wavenumber increases, the energy of radiation is also increases while on the other hand, if the wavenumber decreases the frequency and energy of radiation is also decreases.
Which part of a seed plant develops into sperm cells? o embryo pollen 0 seed O xylem
Answers
Answer:
Pollen
Explanation:
bc i take notes and also my sister studies bio
PLZ GIMME BRAINLIEST
Answer:
correct
Explanation:
in which of the following molecules , the highlighted carbon atom contains two unhybridized p-orbitals?
A. CH4
B. CH≡CH
C. CH3‒CH3
D. CH2=CH2
Answers
Answer:
D
Explanation:
The correct answer is D. In ethylene (CH2=CH2), the carbon atoms in the double bond have two unhybridized p-orbitals.
Why do we use an object's mass , rather than its weight, to indicate the amount of matter it contains?
Answers
Explanation:
because the mass of an object is lighter than the weight therefore knowing the mass in which the object occupies
Explanation:
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When a water molecule forms hydrogen bond with another water molecule, which atoms are involved in the interaction?
Answers
Answer:
hydrogen and oxygen
Explanation:
el 188497 percent of the world's water supply is difficult, if not impossible, to obtain or to use because it is in the oceans or in the form of glaciers and ice caps. Scientists are exploring methods of conserving and protecting the rest of Earth's water supply for the growing population. According to the information provided, which of the following activities most directly affects the water supply?
Answers
Producing energy and manfacturing of the following activities most Mass directly affect the water supply
what is The definition of MassAn object's mass is determined by how much matter it has. Anything that has more substance will weigh heavier overall. For instance, because an elephant contains more stuff than a mouse does, it has a heavier mass. How much energy an object contains is not determined by its size.
What does "has mass" mean?The resistance of the body to acceleration (change in velocity) when ever a net force is employed can be measured experimentally as mass, which is equivalent to inertia. The gravitational pull of an object to other bodies is also dependent on its mass.
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which change of phase is exothermic
Answers
Fusion, vaporization, and sublimation are endothermic processes, whereas freezing,condensation, and deposition are exothermic processes.
So what's 1+1? im giving brainliest!
Answers
1+1 is equal to 2 :)
1+1=2
The major products obtained from the following sequence of reactions are:
(CH 3) 2 CHCH 2 N(CH 2 CH 3 ) 2 →CH 3 I H 2 O→ Ag 2 O →heat products.
Answers
Answer:
The answer is "Option C".
Explanation:
Please find the complete question and its solution in the attached file.
using Hoffman's elimination reaction.
Make a He atom with a mass of 4. How many protons did you put in the nucleus?
Make a Li atom with a mass number of 7. How many electrons did you place in the outermost orbital
(ring)?
Make a N atom with a mass number of 14. How many neutrons are in the nucleus?
Make a B atom with a mass number of 11. How many electrons did you put in the second orbital (ring)?
Answers
Answer:
This question appear incomplete
Explanation:
This question appear incomplete. However, let's answer the resulting questions. Firstly, let's define mass number since each of the "problems" refers to mass number. Mass number is the total number of protons and neutrons in the nucleus of an atom. It should also be noted that number of protons in any given neutral atom is the same with the number of electrons of such an atom.
1) Make a He atom with a mass of 4. How many protons did you put in the nucleus?
Answer: Helium (He) atom (having a mass number of 4) has an atomic number of 2. Atomic number is the number of protons and thus 2 protons would be in the nucleus of the Helium atom.
2) Make a Li atom with a mass number of 7. How many electrons did you place in the outermost orbital (ring)?
Answer: Lithium (Li) atom (having a mass number of 7) has an atomic number of 3. Remember that atomic number (number of protons) equals number of electrons in a neutral atom. Thus, lithium atom would have 3 electrons; 2 electrons in it's first shell and 1 electron in it's outermost shell
3) Make a N atom with a mass number of 14. How many neutrons are in the nucleus?
Answer: Nitrogen (N) atom (with a mass number of 14) has an atomic number of 7. Since atomic number is the number of protons and mass number is the number of protons + neutrons. Then, number of neutrons would equal mass number minus atomic number:
number of neutrons = 14 - 7
number of neutrons = 7 neutrons
4) Make a B atom with a mass number of 11. How many electrons did you put in the second orbital (ring)?
Answer: An atom (Boron) with mass number of 11 has an atomic number of 5. Since atomic number eventually equals number of electrons, then Boron has 5 electrons; 2 electrons in it's first shell and 3 electrons in it's second orbital/ring.
Answer:
2 protons in the He nucleus,
1 electron in the outermost,
7 neutrons in the nucleus
3 electrons in the 2nd orbital ring
Explanation:
I just did it on E2020
Lucite contains 59.9 g C, 8.06 g H,
and 32.0 g O. You want to
determine the empirical formula.
How many moles of C are in the
sample?
[ ? ] mol C
Answers
The number of moles present of C in the given sample are 4.98.
The empirical formula for lucite is \(C_{5}\)\(H_{8}\)\(O_{2}\).
What are moles?Moles are standard units for measuring the quantities of atoms,molecules or specified particles.They are also called as mol.
How to calculate empirical formula?59.9g of C×\(\frac{mol C }{12.01 g of C}\\\)=4.98 mol of C
8.06g of H×\(\frac{mol H}{1.00gofH}\)=8.06 mol of H
32.0g of O×\(\frac{molO}{16.0gof O}\)=2 mol of O
it can be written as:\(C_{4.98}\)\(H_{8.06}\)\(O_{2}\)
In the above,oxygen has the least moles.So,divide by 2:\(C_{2.5}\)\(H_{4.03}\)\(O_{1}\)
However,it cannot be in decimal.So,multiply by 2:\(C_{5}\)\(H_{8}\)\(O_{2}\)
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Within a plant, photosynthesis is critical. It provides cells with the glucose they need for
energy. Photosynthesis is important for another reason, too. It's part of the flow of carbon
through organisms and the environment. This cycle, known as the carbon cycle, is essential
for life on Earth. It includes several processes that are occurring all the time. When plants
photosynthesize, carbon is removed from the atmosphere as carbon dioxide. When animals
and plants use cellular respiration, carbon is released into the atmosphere as carbon
dioxide. Organisms that die and are buried for millions of years turn into fossil fuels, which
are made of carbon. When humans burn those fossil fuels, carbon is released into the
atmosphere as carbon dioxide. Without enough carbon dioxide in the atmosphere, the
planet would be too cold. But too much carbon dioxide contributes to the warming of the
planet that could make it too hot to survive.
Based on the passage, what is one reason that the carbon cycle important?
A It adds carbon into the atmosphere whenever the level begins to drop too low.
B
It helps maintain a level of carbon in the atmosphere that is neither too hot nor
too cold.
с
It removes carbon from the atmosphere whenever the level begins to become
too high.
D
It releases carbon into space, preventing it from building up in Earth's
atmosphere.
Answers
Answer:
i think the answer is B
Explanation:
Answer:
B. (It helps maintain a level of carbon in the atmosphere that is neither too hot nor too cold.)
Explanation:
A galvanic cell consists of a Mg electrode in a 1 M Mg(NO3)2 solution and another metal electrode X in a 1 M X(NO3)2 solution.
The galvanic cell has an E°cell value of 1.61 V. Which of the following elements fits the identity of X. (Use table table 18.1)
Select one:
a.
Pb
b.
Zn
c.
Ni
d.
Fe
e.
Mn
Answers
Answer:
To determine the identity of metal X, we need to compare the standard reduction potentials of the possible metals with the standard reduction potential of the Mg half-reaction.
From Table 18.1, we can find the standard reduction potentials for each of the metals listed:
Pb: -0.13 V
Zn: -0.76 V
Ni: -0.25 V
Fe: -0.44 V
Mn: -1.18 V
The reduction half-reaction for the Mg electrode is:
Mg2+ + 2e- → Mg E° = -2.37 V
The overall reaction for the galvanic cell is:
Mg(s) + X2+(aq) → Mg2+(aq) + X(s)
The standard cell potential is given by:
E°cell = E°(cathode) - E°(anode)
where the cathode is the reduction half-reaction and the anode is the oxidation half-reaction.
Substituting the given values, we get:
1.61 V = E°(X2+/X) - (-2.37 V)
Simplifying, we get:
E°(X2+/X) = 1.61 V + 2.37 V = 3.98 V
Comparing E°(X2+/X) with the standard reduction potentials in Table 18.1, we see that only zinc (Zn) has a reduction potential that is more negative than 3.98 V. Therefore, the metal X is zinc (Zn).
Therefore, the answer is (b) Zn.
What is the molarity of a solution that contains 20 grams of CaBr2
in 0.50 liter of solution?
Answers
Answer:
2 M
Explanation:
mole weight of CaBr2 = 40 + 2 * 79.9 = 199.8 gm
20 gm is then 20/199.8 =.1 mole
.1 mole / .50 liter = 2 M
23.780 g of acetaldehyde (CH3CHO) reacts completely with oxygen to produce acetic acid (HC2H3O2) using manganese (II) acaetate catalyst according to the equation shown below: 2CH3CHO + O2 → 2HC2H3O2 What mass of oxygen reacted with acetaldehyde ? (Atomic mass: C-12.011 g/mol; 0-15.999 g/mol; H- 1.008 g/mol). Show answer choices 34.558 g 34.494 g 8.623 g 17.247 g
Answers
The mass of oxygen, O₂ required to react with the 23.780 g of acetaldehyde, CH₃CHO is 8.636 g
How do i determine the mass of oxygen required?The mass of oxygen, O₂ required to react with the 23.780 g of acetaldehyde, CH₃CHO can be obtain as follow:
2CH₃CHO + O₂ → 2HC₂H₃O₂
Molar mass of CH₃CHO = 44.053 g/molMass of CH₃CHO from the balanced equation = 2 × 44.053 = 88.106 gMolar mass of O₂ = 31.998 g/molMass of O₂ from the balanced equation = 1 × 32 = 32 gFrom the balanced equation above,
88.106 g of CH₃CHO reacted with 32 g of O₂
Therefore,
23.780 g of CH₃CHO will react with = (23.780 × 31.998) / 88.106 = 8.636 g of O₂
Thus, the mass of oxygen required for the reaction is 8.636 g. None of the options are correct
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At which electrade in a voltaic cell does redaction always occar?
Answers
Answer:cathode
Explanation:It is also known as the galvanic cell or electrochemical cell. In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.
Question 9 of 16
What is the reactant(s) in the chemical equation below?
3CO(g)+Fe₂ O₃(s) → 2 {Fe}(s)+3CO₂(g)
A. Fe₂ O₃(s)
B. 2 Fe(s)+3CO₂(g)
C. 2 Fe(s)
D. 3 CO(g)+Fe₂ O₃(s)
Answers
Answer:
3CO(g) + Fe₂O₃(s)
Explanation:
In a chemical equation, the reactants are the substances that undergoes a chemical reaction to form the products. In this case, 3CO(g) and Fe₂O₃(s) react to form 2 {Fe}(s) and 3CO₂(g).
WHO EVER ANSWERS FIRST IS GETTING BRAINLIEST ( Correctly )
Most geologists rejected Alfred Wegener’s idea of continental drift because
they were afraid of the new idea.
Wegener was too interested in what Earth was like millions of years ago.
Wegener used several different types of evidence to support his hypothesis.
Wegener could not identify what force could move the continents.
Answers
Answer:
Wegener could not identify what force could move the continets.
Explanation:
Brainliest will be rewarded!
Answers
Option B, where [OH-] is 1.0 x 10-13 mol dm-³3, is the only one that can be considered basic. Therefore, Option B is the correct answer.
To determine whether a solution is basic or acidic at 25 °C, we can compare the concentration of hydroxide ions ([OH-]) with the concentration of hydronium ions ([\(H_3O\)+]). In a neutral solution, the concentrations of [\(H_3O\)+] and [OH-] are equal, resulting in a pH of 7.
Option A states that the concentration of [\(H_3O\)+] is 1.0 x 10-3 mol dm-3. Since [\(H_3O\)+] represents the concentration of hydronium ions, this solution would be acidic because the concentration of [\(H_3O\)+] is higher than [OH-], indicating an excess of hydronium ions.
Option B states that the concentration of [OH-] is 1.0 x 10-13 mol dm-³3. In this case, [OH-] is higher than [\(H_3O\)+], indicating an excess of hydroxide ions. Therefore, this solution would be considered basic.
Option C states that the solution has a pH of 4.00. A pH of 4.00 is below the neutral pH of 7, indicating an excess of hydronium ions and an acidic solution. Therefore, this option does not represent a basic solution.
Option D states that the concentration of [\(H_3O\)+] is 1.0 x 10-13 mol dm-3. Similar to Option A, this concentration of [\(H_3O\)+] indicates an acidic solution, not a basic one.
Option B
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Answer:
D is the correct answer
Explanation:
In order for a solution to be basic at 25 C, the H+ concentration has to be less than the OH- concentration, and given that H+ times OH- is 10^-14, we deduce that H+ must be less than 10^-7 for the solution to be acidic. Thus, A can be eliminated, and so can C. With B, we calculate an H+ concentration of 0.1M, which also fails to be less than 10^-7
Thus, D is the correct answer and we can verify that as H+ is less than 10^-7.
Note: I do not know why my previous answer was deleted for "being incorrect", and i'm not sure how the incorrect answer was "expert verified", but I am as certain that D is the correct answer as i am sure of 3*(4+5-1) being equal to 24.
1 answer
......................................................
Answers
The most accurate statement about signal transmissions among the given options is:
a) All signals in transmission will lose clarity with distance.
When a signal is transmitted over a distance, it can experience various types of degradation or attenuation. Factors such as distance, interference, noise, and the medium through which the signal travels can all contribute to a reduction in the clarity or quality of the signal. This means that as the distance between the source and receiver increases, the signal may become weaker, distorted, or prone to interference, resulting in a loss of clarity.
Shivani measures out 6.0 moles of epsom salt (MgSO) to put her bath. How many grams MgSO4 went in the bath?
Answers
Answer: 720 g
Explanation:
To solve this we must be knowing each and every concept related to mole. Therefore, shivani measures out 6.0 moles of epsom salt (MgSO\(_4\)) to put her bath. 1,566g MgSO\(_4\) went in the bath.
What is mole?A mole is merely a measuring unit. In reality, it is one of its International System of Units' seven foundation units. When current units are insufficient, new units are created.
Chemical reactions frequently occur at levels where employing grams would be inappropriate, but using absolute quantities of atoms/molecules/ions would also be misleading.
For all practical reasons, one mole of a substance in grams is nearly equal to 1 molecule for the compound per daltons.
Mathematically,
number of mole =given mass ÷ molar mass
number of mole=6.0 moles
molar mass of epsom= 261.47g/mol
substituting all the given values in the above equation, we get
6.0 moles =mass of epsom ÷ 261.47g/mol
mass of epsom =1,566g
Therefore, 1,566g MgSO\(_4\) went in the bath.
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what is the mass spectrom
Answers
Answer:
Here's your Answer
Explanation:
the mass spectrum is the graphical representation of the ion abundance versus the mass to charge of the ions separated in mass spectrometer