The purpose of uranium enrichment is to increase the percentage of the uranium-235 isotope with respect to others, with a necessary percentage of around 4% for light water reactors.
What is uranium?Chemical element uranium has the atomic number 92 and the letter U. It is an actinide metal in the periodic table's silvery-gray series. There are 92 protons and 92 electrons in an atom of uranium, of which 6 are valence electrons. All uranium isotopes are unstable, making uranium very mildly radioactive. The half-lives of uranium's naturally occurring isotopes range from 159,200 years to 4.5 billion years.
Uranium-238, which contains 146 neutrons and makes up more than 99% of the uranium on Earth, and uranium-235 are the two most prevalent isotopes in natural uranium (which has 143 neutrons). The element with the largest atomic weight among those found in the early universe is uranium. Its density is somewhat lower than that of gold or tungsten and is roughly 70% higher than that of lead.
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Your team is assigned the Funky Mix. Your unknown has a boiling range of 121-124 oC. You take an IR of your compound and see a carbonyl peak at 1730 cm -1. What is the most likely identity of your unknown
It is highly probable that your unknown compound is a ketone.
Based on the information provided, the most likely identity of your unknown compound is a ketone.
The presence of a carbonyl peak at 1730 cm-1 in the IR spectrum suggests that the compound contains a carbonyl functional group, which is commonly found in ketones.
Additionally, the boiling range of 121-124 oC is consistent with the boiling range of many ketones. Therefore, it is highly probable that your unknown compound is a ketone.
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A cup of sugar has a volume of 237 ml. What is the mass of the сup of sugar if the density is 1.59 g/mL?
Answer:
\(\boxed {\tt 376.83 \ grams}\)
Explanation:
The density formula is
\(d=\frac{m}{v}\)
Rearrange the formula for mass, m, by multiplying both sides of the equation by v.
\(d*v=\frac{m}{v}*v\)
\(d*v=m\)
The mass can be found by multiplying density and volume.
The density of the sugar is 1.59 grams per milliliter. The volume is 237 milliliters.
\(d= 1.59 \ g/mL \\v= 237 \ mL\)
Substitute the values into the formula.
\(m= 1.59 \ g/mL * 237 \ mL\)
Multiply. Note that the milliliters, or mL will cancel each other out.
\(m=1.59 \ g * 237\)
\(m=376.83 \ g\)
The mass is 376.83 grams.
Gravity is due to:
A. the pull between any objects with mass.
b. the pull between Earth and the moon.
c. the pull between atomic nuclei.
d. the pull between the Sun and Earth.
Answer:
I'm probably wrong but I wanna say C.
Explanation:
What effect did the copper wire have on the candle flame? Propose a hypothesis.
Answer:
The flame of the candle looks to go out, but the candle continues to burn. In actuality, the copper wire coil is transferring heat away from the candle flame. The flame returns after the coil of wire is removed.
Explanation:
how much heat energy in kilojoules would it take melt 5 ice cubes at 0° C , each with a mass of 4 grams?
Heat energy is equal to mcT+mL, where m is the mass of the water and c is its specific heat capacity.
L is the specific latent heat of ice fusion.
T stands for temperature change.
Heat energy released therefore equals 54.220+5336=420+1680=2100J.
The small change in volume is what it is. Discover the change in internal energy for a 6 cm cube of iron heated to temperatures between 20 and 300 °C. The amount of energy needed to melt 1 g of ice at 0 °C is 334 J, also known as the latent heat of melting. At zero degrees Celsius, liquid water has 334 J g-1 more energy than ice does. The latent heat of fusion is the energy that is released when the liquid water subsequently freezes. Between 4°C and 0°C, water expands abnormally. When cooled, liquid water contracts as expected up until a temperature of 4 degrees Celsius. After that, it continues to slightly expand up until it freezes, at which point it increases by about 9%.
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Why are all molecules not compounds?
Answer:
Explanation:
All compounds are molecules, but not all molecules are compounds. That is because a molecule can be made up of two atoms of the same kind, as when two oxygen atoms bind together to make an oxygen molecule. However, all compounds are made up of two or more different types of atoms.
Answer:
the last one
Explanation:
2AgNO3 + BaCl2 → 2AgCl + Ba(NO3)2
How many grams of AgCl, silver chloride, are produced from 5.0 g of AgNO3, silver nitrate?
4 g AgCl
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Stoichiometry
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
[RxN] 2AgNO₃ + BaCl₂ → 2AgCl + Ba(NO₃)₂
[Given] 5.0 g AgNO₃
Step 2: Identify Conversions
[Reaction - Stoich] 2AgNO₃ → 2AgCl
Molar Mass of Ag - 107.87 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of AgNO₃ - 107.87 + 14.01 + 3(16.00) = 169.88 g/mol
Molar Mass of AgCl - 107.87 + 35.45 = 143.32 g/mol
Step 3: Stoichiometry
Set up: \(\displaystyle 5.0 \ g \ AgNO_3(\frac{1 \ mol \ AgNO_3}{169.88 \ g \ AgNO_3})(\frac{2 \ mol \ AgCl}{2 \ mol \ AgNO_3})(\frac{143.22 \ g \ AgCl}{1 \ mol \ AgCl})\)Multiply/Divide: \(\displaystyle 4.21533 \ g \ AgCl\)Step 4: Check
Follow sig fig rules and round. We are given 1 sig fig.
4.21533 g AgCl ≈ 4 g AgCl
Which refers to solid ice that condenses and forms on surfaces like grass or windows?
dew
frost
hail
sleet
Frost refers to solid ice that condenses and forms on surfaces like grass or windows.
WHAT IS FROST?Frost refers to a deposit of small white ice crystals formed on solid surfaces when the temperature falls below freezing temperature.
Frost forms when the temperature of the atmosphere is below freezing i.e. < 0°C.
Therefore, frost refers to solid ice that condenses and forms on surfaces like grass or windows.
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Kinetic energy CANNOT be converted into potential energy
True
False
Answer:
false
Explanation:
Answer:
False
Explanation:
Because if you shoot a arrow and go back and get it and use it again it is potential
What is the heat of combustion of ethane, c2h6, in kilojoules per mole of ethane? enthalpies of formation can be found in the table of thermodynamic properties.
The heat of combustion of ethane (C2H6) in kilojoules per mole can be determined by subtracting the sum of the enthalpies of formation of the products from the sum of the enthalpies of formation of the reactants.
The enthalpy of formation is the change in enthalpy when one mole of a compound is formed from its constituent elements in their standard states. By referring to the table of thermodynamic properties, the enthalpies of formation for ethane (C2H6), carbon dioxide (CO2), and water (H2O) can be obtained.
The heat of combustion of ethane can be calculated using the following equation:
ΔHcomb = ΣΔHf(products) - ΣΔHf(reactants)
For the combustion of ethane, the reaction equation is:
C2H6 + 3.5O2 → 2CO2 + 3H2O
Using the enthalpies of formation from the table, the heat of combustion of ethane can be calculated.
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Which of these can be described as a system of stars, gases, dust, and other matter that orbits a common center of gravity?
A.) nebula
B.) asteroid
C.) galaxy
D.) planet
The galaxy is defined as a system of stars, gases, dust, and other matter that orbits a common center of gravity. Thus the correct option is C.
What is a galaxy?A galaxy is generally defined as the massive collection of billions of stars with their solar systems, gas and dust all guarded together by the center of gravity.
It is in the planet earth which is the part of our solar system we all live. The solar system is found to be the part of the galaxy called Milky Way. Our milky way galaxy also contains a supermassive black hole in the center.
There are several types of galaxies which are present in different shapes. Some of them are found to be in spiral shape and some other galaxies are seen as oval shaped and they are known as elliptical galaxies.
There are also some galaxies with irregular shapes and they are seen as blobs. It is the stars that are present inside each galaxies produces light and this massive system comprising of stars, dust gases and the matter are held by the gravity.
Thus the correct option is C- galaxy.
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ch 11. which one of these substances is a liquid at room temperature?
a. CH3OH
b. CF4
c.SiH4
d.CO2
CH\(_3\)OH is a liquid at room temperature. Therefore, the correct option is option A.
A liquid comprises an almost incompressible fluid with an almost constant volume regardless of pressure that adapts to the form of its container. It constitutes one among the four basic forms of matter and the only one that has a known volume but no set shape. A liquid typically has a density that is higher than a gas and comparable to a solid. Condensed matter so refers to both liquid and solid. On the opposite hand, since both liquids and gases may flow, therefore are both referred to as fluids. CH\(_3\)OH is a liquid at room temperature.
Therefore, the correct option is option A.
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For the reaction
CO(g) + 3H2(g)----->CH4(g) + H2O(g)
H°rxn = -206.1 kJ and S°rxn = -214.7 J/K
The standard free energy change for the reaction of 1.78 moles of CO(g) at 308 K, 1 atm would be kJ.
This reaction is (reactant,product) favored under standard conditions at 308 K.
Assume that H°rxn and S°rxn are independent of temperature.
The standard free energy change for the reaction of 1.78 moles of CO(g) at 308 K, 1 atm would be -36.9 kJ. This reaction is product-favored under standard conditions at 308 K.
To calculate the standard free energy change (ΔG°) for the reaction, we can use the equation:
ΔG° = ΔH° - TΔS°
Given that ΔH°rxn = -206.1 kJ and ΔS°rxn = -214.7 J/K, we need to convert the values to kJ and adjust the sign for ΔS°:
ΔH°rxn = -206.1 kJ
ΔS°rxn = -214.7 J/K = -0.2147 kJ/K
Now we can substitute these values into the equation:
ΔG° = -206.1 kJ - (308 K)(-0.2147 kJ/K)
= -206.1 kJ + 66.1736 kJ
= -139.9264 kJ
Since the question asks for the standard free energy change for 1.78 moles of CO(g), we need to calculate the moles of CO(g) in the reaction:
1 mole of CO(g) reacts to form 1 mole of CH₄(g)
1.78 moles of CO(g) will react to form 1.78 moles of CH₄(g)
Therefore, the standard free energy change for the reaction of 1.78 moles of CO(g) at 308 K, 1 atm is -139.9264 kJ.
Based on the negative value of ΔG°, the reaction is product-favored under standard conditions at 308 K.
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how would you detect sulphur in organic compounds
Answer:
sodium fusion is changed to sodium sulphide if sulphur is present in the compound
In what way is a single cell similar to an organism that contains cells?
Like organs in an organism, each organelle has a specific function in a cell. All of the organelles work together to carry out the functions of the cell as a whole, just as organs do to an organism. ... Each organelle contributes to the function of the cell as a whole, and they are essential for the cell's survival.
A sample of gas at 25 C has a volume of 11 L and exerts a pressure of 0.868 atm. How many moles of gas are in the sample?
0.39 mol
3.9 mol
9.3 mol
87 mol
Answer:
0.39 moles of gas are in the sample
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P*V = n*R*T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas.
In this case:
P= 0.868 atmV= 11 Ln= ?R= 0.082 \(\frac{atm*L}{mol*K}\)T=25 C= 298 KReplacing:
0.868 atm*11 L= n*0.082 \(\frac{atm*L}{mol*K}\) *298 K
Solving:
\(n=\frac{0.868 atm*11 L}{0.082 \frac{atm*L}{mol*K} *298 K}\)
n= 0.39 moles
0.39 moles of gas are in the sample
Point out which of your chosen scientist’s contributions are present in the modern atomic model and which were eventually disproven and thus are not part of the modern model
The scientist I have chosen is J.J. Thomson, who made significant contributions to the study of atomic structure in the late 19th and early 20th centuries.
Thomson's most well-known contribution is his discovery of the electron, which he identified as a negatively charged particle present in all atoms. This discovery formed the basis of Thomson's "plum pudding" model of the atom, which proposed that atoms consisted of a positively charged "pudding" with negatively charged electrons scattered throughout.
While this model was eventually disproven, Thomson's discovery of the electron and his work on the measurement of atomic and molecular masses laid the foundation for the modern atomic model. Specifically, Thomson's work on mass spectrometry led to the development of more advanced techniques for determining the masses and properties of atoms and molecules, which are still used in modern research today.
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HELP PLEASE !!!
Name the Salt formed When Nitric acid + Magnesium hydroxide
Answer:
magnesium chloride
Explanation:
Complete step-by-step answer:
The remaining ions combine to produce the salt of neutralisation. The salt is magnesium chloride. The chemical formula for the compound is $MgC{{l}_{2}}$.
Write a balanced nuclear equation for the alpha decay of titanium-45.
Explanation:
20984Po→20582Pb+42α
4520Ca→4521Sc+0-1e+00ν
Explanation:
The alpha decay of polonum-209, which consists of the emission of an alpha particle, will leave behind the atom of a different element.
Notice that the identity of the element changes after the decay. This means that you're dealing with a nuclear transmutation, a process that converts an atom of a given element into an atom of a different element.
How many moles are in 122 g of Cu? Conversion factor: 1 mol = molar mass
Answer:
122g/63.5
1.92 mol
What is the empirical formula for the compound that has 46 grams of sodium, 64 grams
of sulfur, and 48 grams of oxygen?
Answer:
Na2S2O3Explanation:
Divide each weight by their respective element weights.
Na\(_2\)S\(_2\)O\(_3\) is the empirical formula for the compound that has 46 grams of sodium, 64 grams of sulfur, and 48 grams of oxygen.
What is empirical formula?In chemistry, the equation of maybe a chemical compound is the simplest complete number percentage of atoms that make up a molecule. The empirical formulas for sulfur monoxide, SO, and disulfur dioxide, S2O2, are two simple instances of this concept.
They do not, nonetheless, share comparable molecular formulas, which indicate how many elements are contained in each chemical compound's molecules. An empirical formula does not specify the arrangement or number of atoms. Several polymers, including such silicon dioxide, nor ionic compounds, including such calcium chloride (CaCl2), have this property (SiO2).
moles of sodium = 46/23=2
moles of sulfur = 64 / 32=2
moles of oxygen =48 / 16 =3
Na\(_2\)S\(_2\)O\(_3\) is the empirical formula
Therefore, Na\(_2\)S\(_2\)O\(_3\) is the empirical formula.
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A compound is 21.6% Mg, 21.4% C, and 57.0% O. What is the empirical formula of the compound?
Answer:
Compound x = \( MgC_{2}O_{4}\)
Explanation:
Let the compound be x
Assuming we have a 100g of compound x
Given the following data;
Magnesium, Mg = 21.6% = 21.6g
Carbon, C = 21.4% = 21.4g
Oxygen, O = 57.0% = 57.0g
Now, we would find the amount of moles for each element.
Atomic mass of Mg = 24.30g
Atomic mass of C = 12.01g
Atomic mass of O = 16.00g
Amount of moles for Mg;
21.6*(1/24.30) = 0.89mol
Amount of moles for C;
21.4*(1/12.01) = 1.78mol
Amount of moles for O;
57.0*(1/16.00) = 3.56mol
We then divide by the smallest to find the ratio;
0.89/0.89 = 1 Mol of Mg
1.78/0.89 = 2 Mol of C
3.56/0.89 = 4 Mol of O
Therefore, the ratio of Mg, C and O is 1:2:4.
Compound x = \( MgC_{2}O_{4}\)
Hence, the empirical formula of the compound is \( MgC_{2}O_{4}\)
80 Points for the first 2 middle school people who answer plus a free brain list
What is the difference between chemistry terms like atoms, molecules, compounds, mixtures, etc.?
Sure, here is a brief explanation of the difference between atoms, molecules, compounds, and mixtures in chemistry:
Atoms are the smallest unit of an element that can exist. They are made up of protons, neutrons, and electrons.
Molecules are groups of two or more atoms that are chemically bonded together. The atoms in a molecule can be of the same element, like in oxygen (O2), or of different elements, like in water (H2O).
Compounds are substances that are made up of two or more elements that are chemically combined. Compounds have a fixed composition, meaning that they always contain the same elements in the same proportions.
Mixtures are substances that are made up of two or more substances that are not chemically combined. The components of a mixture can be separated by physical means, like filtration or distillation.
Here is a table that summarizes the key differences between atoms, molecules, compounds, and mixtures:
| Property | Atom | Molecule | Compound | Mixture |
|---|---|---|---|---|
| Composition | Single element | Same element or different elements | Two or more elements | Two or more substances |
| Bonding | Not bonded | Chemically bonded | Chemically bonded | Not chemically bonded |
| Separation | Not possible | Not possible | Possible | Possible |
| Properties | Same as element | Same as elements or different | Different from elements | Same or different from components |
I hope this helps! Let me know if you have any other questions.
Match 4 terms with definitions
Answer:
Explanation:
atom = no. d
element=no. b
particles=no. a
scienctific theroy=no. c
1. (a) Write resonance structures showing how the aryl group of trans- anethole stabilizes the intermediate carbocation shown in "Under- standing the Experiment." (b) Based on your results, explain any differences or similarities in the stereochemistry of the bromine addi- tion reactions of trans-cinnamic acid and trans-anethole.
a) Resonance structures showing how the aryl group of trans- anethole stabilizes the intermediate carbocation:
Carbocation (I) gets stabilized by the resonance effect of the aryl group of trans-anethole, which results in intermediate carbocation (II) shown below.
The intermediate carbocation (II) formed has a stabilized aryl group, which makes the intermediate relatively stable and more reactive than the corresponding cation of styrene or vinyl chloride.
b) Based on your results, explain any differences or similarities in the stereochemistry of the bromine addition reactions of trans-cinnamic acid and trans-anethole:
In both the cases of trans-anethole and trans-cinnamic acid, the addition of bromine takes place in a stereospecific way. In trans-anethole, addition takes place with the formation of trans-2,3-dibromoanethole, which is similar to the formation of the anti-addition of bromine in trans-cinnamic acid to form trans, trans-2,3-dibromocinnamic acid. Therefore, both the bromine addition reactions lead to the formation of the corresponding anti-isomers in high yields due to the steric factor involved in the intermediate carbocation formation.
Intermediate carbocation plays a crucial role in this reaction. In the case of trans-anethole, intermediate carbocation gets stabilized by the resonance effect of the aryl group of trans-anethole, which results in a relatively stable intermediate. On the other hand, in the case of trans-cinnamic acid, intermediate carbocation formation occurs at the more substituted carbon atom, which leads to the formation of the anti-isomer. This is because the aryl group gets stabilized by the delocalization of electrons due to its π-electron-rich nature.
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How does oxygen become an ion with a -2 charge?
A. they gain two electrons
B. they lose two electrons
C. they share two electrons
Answer:
they gain two electrons
Explanation:
because they gain negativity :)
Question 10 of 10
After a person eats a sugary snack, his blood sugar levels may rise for a short
period of time. However, the body works quickly to return blood sugar levels
to normal. What is this an example of?
O A. Respiration
B. Homeostasis
C Ethics
D. Development
A student is studying asbestos, a mineral that causes cancer in humans. One of the components of asbestos is silicon, a somewhat reactive element, that is the second most abundant element found in the Earth’s crust. Which characteristic of silicon is most closely related to its chemical reactivity?
The atomic mass of silicon, which is 28.085 amu
The density of silicon, which is 2.33 g/cm3
The 4 valence electrons in each atom of silicon
The 14 protons in each atom of silico
Answer:
The destiny of silicon,which is 2.33 g/cm3
Explanation:
Pedro's book weighs 19/4 pounds. Blanca's book weighs 17/7 pounds. Use estimation to determine about how much more Perdro's book wweighs than Blanca's.
A 1lbs
Sorry I meant math.
B 2lbs
C 6lbs
D 7lbs
Answer:
2pounds
Explanation:
Given parameters:
Weight of Pedro's book = \(\frac{19}{4}\) pounds
Weight of Blanca's book = \(\frac{17}{7}\) pounds
Unknown:
How much more does Pedro's book weigh more than Bianca's book ?
Solution:
To Solve this problem, let us convert the fractions to decimal;
Weight of Pedro's book = 4.75 pounds
Weight of Bianca's book = 2.43 pounds
Differences = 4.75pounds - 2.43 pounds
= 2.32 pounds
Estimating gives 2pounds
A worker is melting samples of various metals. Which sample will require the most heating to melt?
(check upload for chart)
A.
1 kg of aluminum
B.
2 kg of nickel
C.
3 kg of silver
D.
5 kg of tin