The amount of the original isotope that remains after 30 days is 11.14.
What is the half life?
The half life of a radioactive nuclide has to do with the time that it takes for only half of the original number of nuclides to remain.
Now;
No = 150 grams
N = ?
t1/2 = 8 days
t = 30 days
Then;
N/No = (1/2)^t/t1/2
N/150 = (1/2)^30/8
N/150 = (1/2)^3.75
N = (1/2)^3.75 * 150
N = 11.14
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Given the half-life, the amount remaining is 11.14 g
What is the amount of Iodine-131 remaining after 30 days?The half-life of idine-131 is 8 days.
Using the half-life formula:
Nt = No * (0.5)^(t/t1/2)
Amount remaining = 150 * (05)^(30/8)
Amount remaining = 11.14 g
In conclusion, the amount remaining is determined from the half-life of the substance.
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A chemist measured the amount of magnesium oxide produced during an experiment. She finds that 999. g of magnesium oxide is produced. Calculate the
number of moles of magnesium oxide produced.
Round your answer to 3 significant digits.
Answer:
24.8 moles MgO
Explanation:
To find the number of moles produced, you need to multiply the mass (999 grams) by the molar mass of magnesium oxide. The molar mass is made up of the atomic weights of each element times their quantities in the molecule.
Molar Mass (MgO): 24.305 g/mol + 15.998 g/mol
Molar Mass (MgO): 40.303 g/mol
999 g MgO 1 mole
-------------------- x ---------------------- = 24.8 moles MgO
40.303 g
A 16.0 L gas cylinder has been filled with 8.00 moles of gas. You measure the pressure to be 3.70 atm . What is the temperature inside the tank? Express your answer to three significant figures and include the appropriate units.
The temperature inside the tank is 9.013K
Using the ideal gas equation
T=PV / nR
Given,
n = 0.821
R = 8
P = 3.70
V = 16
T = 16 * 3.70 / 0.821 * 8
T = 59.2 / 6.568
T = 9.013
The temperature inside the tank is 9.013K
Many gases such as nitrogen, oxygen, hydrogen, noble gases, some heavier gases like carbon dioxide, and mixtures such as air, can be treated as ideal gases within reasonable tolerances over a considerable parameter range around standard temperature and pressure.
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When uranium ionizes and becomes u 238 5 , there are _____ protons, _____ neutrons, and _____ electrons.
The ionized uranium (238 [tex]U^{5+}[/tex]) has 92 protons, 146 neutrons and 87 electrons.
What is Uranium(238) called?The U²³⁸ is a stable isotope of Uranium. It cannot sustain a chain reaction.
The atomic number for uranium is 92 and its atomic mass is 238.
How many protons, electrons and neutrons are there?The atomic number for U²³⁸ is 92.
So, the number of protons or electrons = 92
Then, the number of neutrons = atomic mass - number of protons
⇒ 238 - 92 = 146
How many protons, electrons and neutrons are there in the ionized Uranium?The Uranium is ionized and becomes ²³⁸U⁵⁺.
So,
The number of protons = 92
The number of electrons = 92 - 5 = 87 (Since uranium is ionized by 5+ electrons i.e., removing 5 electrons)
The number of neutrons = atomic mass - number of protons
= 238 - 92 = 146
Thus, when uranium ionizes and becomes ²³⁸U⁵⁺, there are 92 protons, 146 neutrons, and 87 electrons.
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another one. i’m still stuck on these problems pls help lol
Answer:
Not so sure. Hope it helps...
What is the ratio by mass of these compounds a. 2na+cl2 =2nacl? b.h2o +nao=2naoh? c.hcl+naoh=nacl+h2o?
The ratio of the mass of compounds:
a. 2Na + Cl[tex]_{2}[/tex] → 2NaCl = 46 + 70 → 46 : 70
b. H[tex]_{2}[/tex]O + NaO → 2NaOH = 1 : 8 + 23 : 16 → 23 : 16 : 1
c. HCl + NaOH → NaCl + H[tex]_{2}[/tex]O = 1 : 35 + 23 : 35 → 23 : 35 + 1: 8
What is a molecular mass?
Molecular mass refers to the total sum of the masses of the atoms or components that make up the molecule.
Calculation:
a. 2Na + Cl[tex]_{2}[/tex] → 2NaCl
The atomic mass of Na= 23The atomic mass of Cl= 35(Na x 2) + (Cl x 2) → (Na x 2) : (Cl x 2)
(23 x 2) + (35 x 2) → (23 x 2) : (35 x 2)
46 + 70 → 46 : 70
b. H[tex]_{2}[/tex]O + NaO → 2NaOH
The atomic mass of H = 1The atomic mass of O= 16Atomic mass of Na= 23(H x 2) : (O x 1) + (Na x 1) : (O x 1) → (Na x 2) : (O x 2) : (H x 2)
(1 x 2) : (16 x 1) + (23 x 1) : (16 x 1) → (23 x 2) : (16 x 2) : (1 x 2)
2 : 16 + 23 : 16 → 46 : 32 : 2
1 : 8 + 23 : 16 → 23 : 16 : 1
c. HCl + NaOH → NaCl + H[tex]_{2}[/tex]O
The atomic mass of H= 1The atomic mass of Cl= 35The atomic mass of Na= 23The atomic mass of O= 16(H x 1) : (Cl x 1) + (Na x 1) : (Cl x 1) → (Na x 1) : (Cl x 1): (H x 2) : (O x 1)
(1 x 1) : (35 x 1) + (23 x 1) : (35 x 1) → (23 x 1) : (35 x 1) : (1 x 2) : (16 x 1)
1 : 35 + 23 : 35 → 23: 35 + 2: 16
1 : 35 + 23 : 35 → 23 : 35 + 1: 8
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Which is the best reason for choosing the beaker for heating the solution? the beaker is the only container that can withstand high temperatures. the beaker's wide mouth allows the thermometer to rest against the side. the beaker will not tip over when placed on the hot plate. the beaker is unbreakable.
The selection of the beaker for heating the solution:
The best reason for choosing the beaker for heating the solution is "The beaker will not tip over when placed on the hot plate".
What is a Beaker?:
A glass container with a flat bottom and a tiny pouring mouth is known as a beaker. It is employed in the chemistry lab to stir, heat, and mix liquids.Beakers can be heated on a hot plate directly. Because of their flat bottoms, these containers will uniformly distribute heat when the mixture is shaken. It is best to heat indirectly any other container without a flat surface.Borosilicate glass, which is frequently used to make glass beakers, has boron trioxide, which gives it the ability to withstand sharp temperature changes. It can endure temperatures of up to 400°C.
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When a substance is dissolved in water, the properties of the solution will be different from those of the water?
Answer:
yes
Explanation:
boiling point, freezing point, ph , density are just a few that would change
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes? Molecules in both the metal and the surrounding air will start moving at lower speeds. Molecules in both the metal and the surrounding air will start moving at higher speeds. The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up. The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Answer:
The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Explanation:
As molecules heat they begin to move faster. The heat from the metal plate will make the molecules at room temperature move faster. And the room temperature makes the hot place cool, making the hot plate molecules slow down.
To visualize this, you can use this link
https://phet.colorado.edu/en/simulations/gas-properties
click the play button to activate the activity
Which state of matter resists compression the most?
A. Gas
B. Liquid
C. All of these
D. Solid
Answer:
Explanation:
Answer: D. Solid
Arroyo Books sells new and used books, some long (with many pages) and some short (with fewer pages). Decide
whether each property of their books listed in the table below is extensive or intensive, if you can. If there's not
enough information to decide, check the can't decide box.
The percentage of words in the book which have more than two syllabus: Can't decide. The number of pages in the first chapter is extensive property. The shipping cost of the book (which depend on weight) is extensive property.
What is Intensive Property ?The property which do not depend on the quantity or amount of matter is called Intensive Property. The intensive properties are pressure, temperature, density, concentration, taste, color etc.
What is Extensive Property ?The property which depend upon the amount of matter in a sample is called Extensive property. The extensive properties are mass, volume, heat capacity, weight, length, shape etc.
The percentage of words in the book which have more than two syllabus in this case we cannot decide whether it is extensive property or intensive property.
The number of pages in the first chapter is extensive property because the pages have some mass and mass is extensive property.
The shipping cost of the book (which depend on weight) is extensive property as weight is an extensive property which depend upon the amount of matter.
Thus from the above conclusion we can say that The percentage of words in the book which have more than two syllabus: Can't decide. The number of pages in the first chapter is extensive property. The shipping cost of the book (which depend on weight) is extensive property.
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Sodium (Na) is a ____
The element oxygen has a molar mass of 15.999 grams, thus one mole of oxygen is equal to _____ g/mol.
Answer: 15.999 grams.
Explanation: The molar mass of an element is the mass of one mole of that element. You can also solve this with a little bit of math.
[tex]15.999gO*\frac{1molO}{15.999gO} =1molO[/tex]
I hope this helps! Pls mark brainliest!! :)
What volume (in liters, at 703 k and 2.04 atm) of chlorine gas is required to react with 3.39 g of p?
The volume of chlorine required is 7.71 L.
The reaction between phosphorus and chlorine is:
2P + 5Cl₂→ 5PCl₅
Therefore, 2 moles of P requires 5 moles of chlorine to react with it.
Given mass of P =3.39 g
Molar mass of P=30.97 g/mol
No. of moles of P = given mass/ molar mass = 3.39 / 30.97 = 0.109 moles
2 moles of P requires 5 moles of chlorine
0.109 moles of P will require 0.109 x 5/2 = 0.2725 moles of chlorine
According to ideal gas equation
PV=nRT
2.04 x V = 0.2725 x 0.0821 x 703
V = 0.2725 x 0.0821 x 703 / 2.04
V = 7.71L
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PLEASE HELP!! What is the pH of a solution with a [H3O+] concentration of 3.4 x 10-11 M? Is the solution acidic, basic, or neutral?
[tex]\\ \tt\leadsto pH=-log[H^+][/texM
[tex]\\ \tt\leadsto pH=-log[3.4\times 10^{-11}][/tex]
[tex]\\ \tt\leadsto pH=-log3.4-log10^{-11}[/tex]
[tex]\\ \tt\leadsto pH=-0.53+11[/tex]
[tex]\\ \tt\leadsto pH=10.47[/tex]
Basic
Considering the definition of pH, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.
Definition of pHpH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]= - log [H₃O⁺]
Numerical scale of pHThe numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
pH in this caseIn this case, you know [H₃O⁺]= 3.4×10⁻¹¹ M.
Replacing in the definition of pH:
pH= -log (3.4×10⁻¹¹ M)
Solving:
pH= 10.47
Finally, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.
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Which bond is the most polar?
Group of answer choices
a)between C and O
b)between Br and Br
c)between C and S
d)between C and Is
Answer:
a between c and o
Explanation:
♡´･ᴗ･`♡
The reaction catalyzed by succinyl-CoA synthetase temporarily transfers a phosphoryl group to a His residue in the enzyme's active site. What stabilizes the phosphoenzyme intermediate
Answer:
In the dephosphorylated structure, the enzyme is stabilized via coordination of a phosphate ion by the active-site histidine residue and the two ...
What is Chemical Bonding?
Explain please.
Answer:
Chemical bonds are how atoms, and even molecules join together.
Explanation:
There are two main types of primary chemical bonds. While secondary links relate to molecules, primary ties are atom to atom. This answer explains basic primary bonds only.
One must comprehend what a valence shell is before I proceed. The outer electron orbital of an atom is known as the valence shell. Most of the time (except from hydrogen), atoms desire to have 8 electrons in their valence shell, thus they form bonds with other atoms to accomplish this.
All bonds result in a new chemically different molecule. Now, the two types are:
Covalent: When two atoms combine their electrons to fill their valence shells. The atoms are joined together by this "sharing."Ionic: When one atom transfers an electron to another atom in order to fulfill the valence electron requirement. Because electrons have a negative charge, the atom that produced them gains a positive charge as a result of losing its negative charge. The atom that received the electron therefore acquires a negative charge. Because opposing charges attract, it seems sense that the charged atoms bind as a result.Increasing technology addiction among the youth write a letter to editor
Answer:
these two would help you
Explanation:
have a good day ᕕ( ᐛ )ᕗ
Which ionic compound is expected to form from combining the following pairs of elements: a. Barium and fluorine b. Cesium and chlorine c. Lithium and nitrogen d. Aluminum and oxygen
An ionic compound is composed of a cation (generally, a metal ion) and an anion (a nonmetal ion). The cation and the anion combine due to the Coulombic force of attraction to form an ionic lattice. The metal atom releases one or more electrons and the nonmetal receives these electrons until they fulfill their octet.
Ionic compounds are held together by opposite charges but do not have a charge. You have to balance the +’s and -‘s. Ba has a charge of +2 F has a charge of -1 You need 2 F- to balance the +2 of Ba BaF2.
a) BaF2 or barium fluoride
b) CsCl or cesium chloride
c) Li3N or lithium nitride
d) Al2O3 or aluminum oxide
Barium And Fluorine
Please check the attached file for a detailed answer.
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How do you define gravity, and how does it work?
Answer:
I'm not a genius but it's an invisible force that pulld object towards eachother, Earth's gravity is what keeps you on the ground and what makes things fall, Anything with mass also has gravity, objects with more mass means they have more gravity
Acetic acid (which is commonly known as vinegar) has a ph of 4.8. what is the hydronium ion (h3o ) concentration of the acetic acid?
Concentration of Hydronium ions in the Acetic acid is [tex]1.58\times10^{-5}[/tex]
Calculation of concentration of acid:
pH of a solution is defined by the concentration of Hydronium ions in the solution.
Also, pH is defined as the negative of logarithm of [tex]log[H^+][/tex]
[tex]pH= -log[H^+][/tex]
pH of Acetic acid= 4.8
Therefore,
[tex]4.8= -log[H^+][/tex]
Taking antilog, we get
[tex][H^+] = 0.0000158M= 1.58\times10^{-5}M[/tex]
The Hydronium concentration of the acetic acid is [tex]1.58\times 10^{-5}[/tex]M.
As Acetic acid is a weak acid which means that ionization of acid is not complete, ie. 100%
That is why the concentration of Hydronium ions are less in the solution.
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A pressure cooker is a covered pot sealed everywhere except for a small circular opening at the top. A small weight placed over this opening determines the pressure at which steam is released from the pot. Suppose that the radius of the opening is 0.450 mm and the weight is 0.848 N. Find the maximum pressure inside the pot.
Answer:
1.02 N/mm2
Explanation:
We can see that the pressure is applied on the small weight that covers the opening.
The area of the circular opening is π(0.512 mm)
= 0.824 mm2
Pressure = Pressure = Force / Area
= (0.847 N) / (0.824 mm2)
= 1.02 N/mm2
If 10L of O2 at 273K and 1 atm is compressed to a pressure of 7 atm at 250K, what is the new volume? *Please pay attention that it says "7 atm" and not "7L"!!!*
The new volume of the gas, given the data is 1.3 L
Data obtained from the questiom Initial volume (V₁) = 10 LInitial pressure (P₁) = 1 atmInitial temperature (T₁) = 273 KNew pressure (P₂) = 7 atmNew temperature (T₂) = 250 KNew Volume (V₂) =? How to determine the new volumeThe new volume of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
(1 × 10) / 273 = (7 × V₂) / 250
Cross multiply
273 × 7 × V₂ = 10 × 250
Divide both sides by 273 × 7
V₂ = (10 × 250) / (273 × 7)
V₂ = 1.3 L
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A sample of ideal gas at room temperature occupies a volume of 27.0 L at a pressure of 852 torr . If the pressure changes to 4260 torr , with no change in the temperature or moles of gas, what is the new volume, V2
The new volume V₂ is 5.4L
The new volume is calculated using Boyle's law formula
That is P₁V₁=P₂V₂
where,
p₁ = 852 torr
V₁ = 27.0
P₂ = 4260 torr
V₂=?
Make V₂ the subject of the formula by diving into both sides of the equation by P₂
V₂ = P₁V₁/P₂
⇒ 852 *
V₂ is, therefore, = 5.4 L
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Please if anyone can help answer!
1.What is a solvent? give examples.
2.What is a solute? give examples.
3.What factors influence the solubility of a solute in a solvent?
Answer:
1.A solvent is a liquid in which another substance is dissolved to form a solution. Examples of solvents include water, alcohol, and vinegar.
2.A solute is a substance that is dissolved in a solvent to form a solution. Examples of solutes include salt, sugar, and caffeine.
3.Several factors can influence the solubility of a solute in a solvent, including the nature of the solute and solvent, the temperature, and the pressure.
Explanation:
Please help me thank you!
The difference in the electronegativity of the Y-P bond is 0.97.
What is electronegativity?The term electronegativity has to do with the difference between the ability of two atoms in a bond to attract the shared electrons of the bond towards themselves.
The electronegativity value of Y is 1.22 while the electronegativity value of P is 2.19.
Hence;
ΔEN = 2.19 - 1.22
ΔEN = 0.97
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the authors imply that the response of various officials to attempts to measure their countries' carbon stock through field surveys has been
The measurement of the countries' carbon stock through field surveys by has been unhelpful, because the officials don't make their countries' land holdings readily available for study.
What is an inference?An inference can be defined as an act through which a reader can deduce the meaning and message (information) that is associated with certain text in a passage, especially through induction.
In this scenario, we can infer and logically deduce that the author implied that the measurement of the countries' carbon stock through field surveys by has been unhelpful, because the officials don't make their countries' land holdings readily available for study.
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Complete Question:
The authors imply that the response of various officials to attempts to
measure their countries' carbon stock through field surveys has been:
A. unhelpful, because they fear that jobs for their countries' scientists will be lost.
B. helpful, because their countries have invested significantly in technology to allow studies to expand.
C. helpful, because their countries stand to benefit from universal carbon data that the studies will uncover.
D. unhelpful, because they do not make their countries' land holdings readily available for study.
NH4+H2O →NH3+H3O
Which one is acting weaker base?
Answer:
NH3
Explanation:
In solution, they are in equilibrium. NH4+ acts as a bronsted Lowry acid and donates an H to become NH3, and NH3 acts as a bronsted lowry base and accepts an H. In this pair, NH3 is a weak base, which gets its basic character due to the presence of lone pair of nitrogen and its ability to donate it.
Sixty-three grams of copper reacted with 32 grams of sulfur. this chemical reaction produced the compound copper sulfide. what was the mass of this compound?
The mass of, [tex]Cu_2S[/tex], compound formed is 77.9g
62 grams of copper reacted with 32grams of sulfur to form copper sulfide.
[tex]Cu + S_2 \rightarrow CuS_2[/tex]
stoichiometry of Cu to S is 2:1
We need to find the limiting reactant
Molar mass of copper = 63.5 g/mol
Molar mass of Sulfur = 32 g/mol
Number of moles of Copper = [tex]\dfrac{mass} {molar mass } = 0.99mole[/tex]
Number of moles of Sulfur = [tex]\dfrac{mass} {molar mass} = \dfrac{32g} {32g/mol} = 1 mole[/tex]
Since copper have lesser number of moles, therefore the limiting reagent is copper so the amount of product formed depends on amount of Cu present
stoichiometry of Copper to [tex]Cu_2S[/tex] is 2:1
0.99 mol of Copper forms = [tex]\dfrac{0.99} {2}[/tex] = 0.49 mol of [tex]Cu_2S[/tex]
Mass of [tex]Cu_2S[/tex] produced = Number of moles [tex]\times[/tex] Molar mass
Mass of [tex]Cu_2S[/tex] produced = 0.49 mol [tex]\times[/tex] 159 g/mol = 77.9g
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please help. i’m strugglingggg
Rewrite this measurement with a simpler unit, if possible.
Answer:
m/s
Explanation:
One 'm' and one 's' in the numerator and the denominator 'cancel out' and you are left with m / s