Answer:
The uranium fluoresces under UV light
Explanation:
The uranium fluoresces under UV light because the UV excites the electrons above the ground state and gives off photons as the electrons transition back to the ground state,” Naomi Marks, a research scientist at the Lawrence Livermore National Laboratory in California, tells Collectors Weekly.
Answer:
Uranium oxide.
Explanation:
Uranium glass does indeed glow under a blacklight. This is because of the uranium oxide that is used to produce the glass. When exposed to ultraviolet light, the uranium oxide will emit a greenish-yellow light.
Why is it not necessary to test the reactivity of the elemental metals with solutions of the same metal ion?
It is not necessary to test the reactivity of the elemental metals with solutions of the same metal ion because it won't react with itself.
What is Reactivity?
This is referred to as the relative capacity or how readily a substance undergoes a chemical reaction.
Reactivity of elements are dependent on various types of parameters such as the number of valence electrons, shells etc and can be tested with other substances. However, it can't be tested with the solutions of the same metal ion because no reaction will occur thereby making it the most correct reason in this scenario.
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Semiconductor materials with band gaps greater than 3. 5 ev are considered to be a?.
Semiconductor materials with band gaps greater than 3.5 ev are considered to be insulators because of high band gap.
What is semiconductor and what the semiconductor materials with band gaps greater than 3.5 ev are considered?Semiconductor is a p-n junction in which the p side is the major holes and is in the positive terminal and n side is electrons major in negative side.There is a case when the band gaps are less than semiconductor , insulators and metals called superconductors.Superconductors have energy band gap much less than the band gaps of metals, semiconductor and insulator.Here the question is asked for the kind of semiconductor material with band gaps greater than 3.5 ev.Materials with band gap of 1.5 to 3.0 ev are semiconductor , with zero ev are metals, and band gap of greater than 4 ev are insulators.Hence the semiconductor materials with band gaps greater than 3.5 ev are considered than 3.5 ev are considered to be insulator.To know more about semiconductor visit:
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The burette is filled with 0.3000 M NaOH. The beaker has 25.00 mL of 0.3000 M HCl. What volume of 0.3000 M NaOH was required by the titration to reach the equivalence point?
The burette is filled with 0.3000 M NaOH. The beaker has 25.00 mL of 0.3000 M HCl.volume of 0.3000 M NaOH was required by the titration to reach the equivalence point is 25 mL.
The equivalence point is the point where mole of each solution are equal to each other.The chemical equation is given as :
NaOH + HCl ----> NaCl + H₂O
The molarity expression is given as :
molarity = moles / volume
moles = molarity × volume
moles = 0.300 × 0.025
moles = 0.0075 mol
number of moles of HCl = number of moles of NaOH
moles of NaOH = 0.0075 mol
volume of NaOH = moles / molarity
= 0.0075 / 0.300
= 0.25 L = 25 mL
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6. Convert the pressure 0.75 atm to mmHg
a. 101.3 mmHg
b. 430 mmHg
c. 570 mmHg
1200
d. 760 mmHg
The pressure 0.75 atm to mmHg is 570 mmHg. Option C.
Since most barometers use mercury as the liquid the height of the liquid is often used as a measure of pressure. Therefore, millimeters of mercury or centimeters of mercury are sometimes used as units of pressure. KPa is an abbreviation for kilopascal, which is the pressure applied to a surface.
Calculation:-
1 atm = 760 MM of Hg
0.75 atm = 0.75 × 760
= 570 MM of Hg
KPa is widely used internationally as a unit of pressure and is also used for example to measure air pressure in car tires. The three methods of measuring pressure are absolute, gage and differential. Absolute pressure refers to the pressure in a vacuum while gauge pressure and differential pressure refer to other pressures such as the ambient atmospheric pressure or the pressure of an adjacent vessel.
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What chemical species are produced when borax dissolves in water? select all that apply.
When borax dissolves in water, two chemical species are produced: B(OH)3 and [B(OH)4].
Describe Borax.Boron, oxygen, and soda are all ingredients in the substance known as borax. The most typical forms of borax are pentahydrate salts, which are soft, colorless, anhydrous, and decahydrate salts. Borax (Sodium Tetraborate Decahydrate) has the chemical formula Na2B4O7.10H2O.
How does a borax solution form in water?Borax is a white, crystalline substance that dissolves more readily in hot water than in cold. Boric acid, which makes up the aqueous solution of borax, is alkaline. Borax ionizes the (Hydroxyl ion) when it dissolves in water, and by hydrolyzing the ion of borate, boric acid is created. Aqueous borax solutions are naturally alkaline because boric acid is a mild acid and NaOH is a strong alkali.
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If there was splattering out of the evaporating dish while you were completing the heating process, how would this have an effect on the subscript of chlorine in the formula? (The formula is Magnesium Chloride)
HCl may spatter in a harmful manner if you use too much heat. 5) Heat the mixture until all of the water has evaporated.
By heating, what do you mean?Heat is the result of the movement of kinetic energy within a material or an item, or by a source of energy to a material or an object. Radiation, conduction, & convection are the three mechanisms through which such energy can be transferred.
What kind of heating is most cost-effective in Australia?Reverse-cycle air con is by far the least expensive way to heat ones home based solely on operating costs. According to our calculations, an opposite way air conditioner will only cost slightly more to run for an entire year than just an immersion heater will charge to run for just three months during the winter.
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what acts as a connector to help convert the nucleotide sequence of mrna into the amino acid sequence of a polypeptide during translation?
Answer:The cell has just transcribed this mRNA strand from its DNA, and it now translates the mRNA's nucleotide sequence into a chain of amino acids. This chain, called a polypeptide, forms the basic structure of a protein. A cellular component called a ribosome coordinates the translation process.
Explanation:
Which of the following halogens is darkest in colour?
Select one:
a. l
b. Br₂
c. F2₂
d. Cl₂
I₂ is the halogens which is darkest in colour than other.
What is halogen?Halogens are the elements which belongs to group 17. Group 17 elements are known as halogens. They are highly electronegative in nature.
The last electronic configuration is ns2 np5. Since, one electron is less to get stable electronic configuration. Therefore, they accept one electron and get stable electronic configuration.
Why halogens are dark in colour?As we move down the group, the darkness of colour increases. This is due to ionization energy which decreases as we move down the group. This is due to increase in the atomic size and decrease in nuclear form which further make high energy level to absorb lesser light and reflects deepen colour on moving down the group. Due to which they appears dark. Therefore, option A is the correct option.
Thus, we can concluded that I₂ is the halogens which is darkest in colour than other.
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In(s) = -4197 (1/T)+17.96 how many grams of salt will dissolve in 5 ml of water at 85c
ln(s) = -4197 (1/T) + 17.96, the amount of salt that will dissolve in 5ml of water at 85°c is 25.6grams, option B.
How is linear regression calculated?With the equation, ln(s) = -4197 (1/T) + 17.96
Where, ln(s) = natural log of substance in solid state
T = temperature of water, 85°c = (85 + 273) to kelvin
Applying to the equation;
ln(s) = -4197 x 1/(85 + 273)) + 17.96
ln(s) = (-4197 /(358)) + 17.96
ln(s) = -11.72 + 17.96
ln(s) = 6.236, to the nearest two decimals, 6.24
s = [tex]e^{6.24}[/tex] where, e is the base the natural log
s = 512.8 grams per 100ml (513, nearest whole number)
If 100ml = 513 grams,
then 5ml = (5 / 100) x 513
s = 25.64 grams/5ml
s = 26 grams
The full question is:
The result of your solubility of a salt experiment led to the following linear regression equation:
ln(s) = -4197 (1/T) + 17.96
How many grams of salt will dissolve in 5 ml of water at 85°c?
a. 260
b. 26
c. 5
d. 511
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The trend towards smaller atomic radii as one moves to the right in a period is _____.
The increasing effective nuclear charge is what causes the tendency towards smaller atomic radii as one advances to the right in a period.
Effective nuclear charge: What is it?Effective nuclear charge is the term for the positive charge that nuclear protons exhibit when they interact with valence electrons.. The effective nuclear charge is always less than the total number of protons in a nucleus because of the shielding effect.
What factors affect effective nuclear charge?The kind of electron determines the effective nuclear charge. Even electrons in 4s and 5s s orbitals spend some time near the nucleus, where they experience the full nuclear charge. As a result, on average, s electrons experience a nuclear charge that is closer to the true nuclear charge.
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What are the two layers that are formed when you mix water and Isopropanol
According to the concept of solubility, isopropanol is miscible with water and hence there is one layer that is formed when water and isopropanol are mixed.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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Progression through the cell cycle is regulated by oscillations in the concentration of which type of molecule?.
Variations in the concentration of the cyclin-type molecule control how quickly the cell cycle advances. It takes a lot of regulation to move a cell cycle forward.
To ensure that division and proliferation are the desired results, a variety of checks and balances are employed. cell cycle -dependent kinases (CDKs) and their partner cell cycle are responsible for facilitating progression. 84,85 Each pair corresponds to a specific cell cycle stage.
Cyclins fall into two primary categories: G1/S cyclins are crucial for maintaining cell cycle regulation at the G1/S transition, and Cyclin A/CDK2 is active in S phase. The modulation of the cell cycle at the G2/M transition depends on G2/M cyclins (mitosis).
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How many asymmetric carbons are present in the compound 2,3,4-tribromohexane
Answer:
There will be 2 asymmetric carbons
Explanation:
2,3,4 trichloropentane 2,4 cetre are chiral but 3
rd
centre is pseudo chiral. It depends on the configuration of 2 & 4 so, the statement is false.
solution
HELP!!!!!!! (CORRECT ANSWERS ONLY!!!!)
7.0 mol Mn can form 7.0 mol MnO and 5.0 mol O2 can form 10.0 mol MnO. What mass of MnO forms during the reaction?
MnO: 70.94 g/mol
[?] g MnO
The mass of the MnO forms during the reaction is equal to 496.58 g.
What is a mole?A mole can be a standard unit that is used to determine how many entities such as atoms, molecules, ions, or other particular particles are present in a given amount of substance.
The number of elementary entities in one mole was found to be 6.023 × 10 ²³ which is known as Avogadro’s constant.
The reaction of Mn and oxygen is represented as:
[tex]2Mn + O_2 \longrightarrow 2 MnO[/tex]
Given, 7 mol of Mn can form MnO = 7 mol
5 mol oxygen gas can form MnO = 10 mol
From the equation, we can say that 2 mol of Mn reacts with oxygen = 1 mol
Then, 7 mol of Mn will react with oxygen = 7/2 = 3.5 mol
Therefore, if we have 7 mol of Mn and 5 mol of O₂then Mn is the limiting reagent.
Then 7 mol of MnO will form MnO = 7 mol
The mass of 7 mol of MnO = 7 ×70.94 = 496.58 g
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Answer:
rounded to ones is 496.60
Write a balanced equation for the reaction that occurs when a piece of magnesium is dropped into hydrochloride acid (HCI) solution forming magnesium chloride (MgCl2) in aqueous state and hydrogen gas
Answer:
The balanced chemical equation is:
Mg_((s))+ 2HCl_((aq))rarrMgCl_(2(aq)) + H_(2(g)
Explanation:
The reaction between magnesium and hydrochloric acid combine to form a salt of magnesium chloride and release hydrogen gas. This single replacement reaction is a classic example of a metal reacting in an acid to release hydrogen gas.
A student measures the length of a book to be 32.4 cm. The accepted value of the length is 32.9 cm. What is the percent error of the student’s measurement?
The percent error of the student’s measurement is 98.48%
While doing any experiment or any calculation we usually calculate the estimated result or value that needs to come at the end of the reaction and that is called as theoretical value. But once the experiment is completed the value that we get is not the same as that of theoretical value and this value is called as the experimental value.
To understand the error that had happened during the experiment we find out the percent error and the formula for it is as follows
Percent error = Experimental value × 100
Theoretical value
When we use the same formula for the above given case we can see that the expected measurement was supposed to be 32.9 but the student measure it to be 32.4 so the percent error here is
= 32.4 × 100 ⇒ 98.48%
32.9
Hence the percent error in calculation is 98.48%
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Why would this path of neurons not work to perform a reflex?
Select all that apply.
the motor neuron should be the interneuron
the motor neuron should be the sensory neuron
the sensory neuron should be the interneuron
the interneuron should be the motor neuron
For reflex action the motor neuron that generates the reflex action and pass to the sensory neuron. Interneuron helps to sensory neuron to communicate with motor neurons. Thus in this picture motor neuron be the interneuron and interneuron be the motor neuron. Thus option A and D are correct.
What is reflex action?Reflex action is generated by our body by the sudden action to for sense of touch or other stimulants. For example, if touch a very hot body, we will take our hand within second and this is resulted by the action of neuron and is called the reflex action.
The movement of hands and legs are controlled by the motor neurons. If we touch any stimulant sensory neurons pass signals to the motor neuron and a signal containing the information of action is returned to the sensory neurons of our hand.
Here, the communication between sensory neuron and motor neuron is facilitated by interneurons. motor neuron be the interneuron and interneuron be the motor neuron. Thus option A and D are correct..
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How many types of atom are contained in an element
Answer:
There are more than 109 different types of atom – one for each element. Differences between the atoms give the elements their different chemical properties. In 2001, there were 115 known elements. However, those above 109 are highly unstable and have been made in only tiny quantities.
Explanation:
A particular element is composed of only one type of atom. Atoms are further composed of subatomic particles called electrons, protons and neutrons.
which of the following quantum numbers (n, l, ml, ms) is not permissible? and why?
a) 1, 0, 0, +1/2
b) 4, 2, -1, -1/2
c) 5, 3, -3, -1/2
d) 2, 1, -1, +1/2
e) 3, 2, -2, -1/2
In the given set of quantum numbers, the set of quantum numbers which is not permissible or forbidden is 4, 2, -1, -1/2, which is option b.
A quantum number is the set of number, which is used to describe the position and energy of the electron in an atom. There are four types of quantum number, which is principal, azimuthal, magnetic, and spin quantum number.
In first option, by looking at first two numbers it is observed that electron is from 1s orbital and it is half-filled. Hence, it is permissible.
In the second option, electron is from 4d orbital and the electron is filled in [tex]p_{y}[/tex] orbital. The electron should be filled first in [tex]p_{z}[/tex] orbital which has ml value -2. Hence, the second set is not permissible.
In the third option, electron is from 5f orbital and it is half-filled in downward position. Hence this set is permissible
In the fourth option, electron is from 2p orbital and it is filled in upward position. Hence, this set is permissible.
In the fifth option, electron is from 3d orbital and it is filled in downward position. Hence, this set is permissible.
Therefore, the set of quantum number which is not permissible is 4, 2, -1, -1/2.
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Chemistry help would be greatly appreciated
The percent by mass of the chromium is 32.1 %.
What is the percent by mass?The term percent by mass has to do with the ratio of the mass of a particular component of the component to the total mass of the compound multiplied by hundred. Let us recall that a percent must involve hundred.
Now we have;
Mass of Cr = 16.05
Total mass of the sample = 50 g
We now have;
Mass of Cr/ Total mass * 100/1
= 16.05/50 g * 100/1
= 32.1 %
Hence, from the total sample, we have about 32.1 % of chromium.
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21.
THINK SMARTER Pablo had a
cup of shredded wheat cereal,
a cup of low-fat milk, and one
other item for breakfast. He had
about 21 grams of protein.
What was the third item Pablo
had for breakfast?
About 21 protein grams were in him. Pablo's third breakfast dish was a scrambled egg.
Describe protein.Protein makes up the majority of the body's organs, tissues, and body parts, include muscle, bones, skin, and hair. It contributes to the production of hemoglobin, which transports oxygen in the blood, and enzymes, which drive numerous chemical reactions.
What is the primary advantage of consuming protein?Your muscles' primary building material is protein. Therefore, consuming enough protein will help you keep your lean muscle and encourage muscular growth when you engage in strength exercise. Eating a lot of protein can help build muscle mass and strength, according to numerous studies.
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gold bar 20cm by 5 cm by 5cm has the density of 19.4g /cm what is the mass
The mass of the gold bar is 9700 g.
Density is the substance's mass in line with a unit of volume. The image most often used for density is ρ, although the Latin letter D also can be used. Mathematically, density is described as mass divided with the aid of volume.
Density is the dimension of the way tightly a cloth is packed together. it is defined as the mass per unit volume. Density symbol D or ρ Density components ρ = m/V, where ρ is the density, m is the mass of the object and V is the quantity of the object. The density of a liquid is a measure of ways heavy it is for the amount measured. in case you weigh identical amounts or volumes of two distinctive beverages, the liquid that weighs more is dense.
Calculation:-
Given,
density = 19.4 g/cm
volume = 20 × 5 × 5
= 500 cm³
Density = mass/volume
mass = density × volume
= 19.4 × 500 g
= 9700 g
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List the elements from least to greatest atomic radius: Zinc (Zn), Oxygen (O), Rubidium (Rb)
Answer:
1 ) Zinc
2 ) Oxygen
3 ) Rubidium
Explanation:
Zinc ( Zn ) - r = 140 pm
Oxygen ( O ) - r = 152 pm
Rubidium ( Rb ) - r = 303 pm
Hope this helps! :)
Use the molar bond enthalpy data in the table to estimate the value of Δ∘rxn for the equation?
C2H4(g)+HBr(g)⟶C2H5Br(g)
The bonding in the molecules is shown.
From the values of bond enthalpy shown, the enthalpy of the reaction is -263 kJ/mol.
What is the enthalpy of the reaction?We know that the enthalpy of the reaction has to do with the energy that has been lost or gained in the reaction. We know that in the course of a chemical reaction, thee is the breaking and the forming of bonds.
Looking at the reaction, we know that the enthalpy of the reaction is to be obtained as the difference between the total bond energies of the products and the total bond energies of the reactants.
The bond energies present are;
C=C - 598 kJ/mol
C-C - 346 kJ/mol
C -H - 416 kJ/mol
H -Br - 366 kJ/mol
C - Br - 285 kJ/mol
Then we have;
[1(346) + 5(416) + 1(285)] - [1( 598) + 4(416) + 1(346) + 1( 366)]
[346 + 2080 + 285] - [598 + 1664 + 346 + 366]
2711 - 2974
= -263 kJ/mol
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which of the bonds shown in red are expected to have ir-active stretching frequencies?
C-C triple bond have different environment. Hence, it will show IR active stretching frequency.
What makes a stretch IR active?To be IR active, a molecule's dipole moment must change as a result of the vibration caused by IR light absorption. The dipole moment is a vector quantity that is affected by the molecule's orientation and the photon electric vector.Some bonds absorb infrared light more strongly than others, whereas others do not. A periodic shift in the dipole moment of the molecule is required for a vibrational mode to absorb infrared light. These vibrations are referred to as infrared active.To learn more about Dipole moment refer,
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The IR active stretching would be observed for the bonds that are not symmetrical.
Which bonds are IR active?We know that compounds that are polar implies that the molecules do have a dipole moment in the molecule. This means that the bond is not symmetrical owing to the fact that the groups that are attached to the central atom of the bond are not the same.
The IR active compounds are the compounds that are have bonds that are not symmetrical. All we need is to look at the bonds and find out the ones that are not symmetrical and hence would have a net dipole moment.
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how many grams of P4 are needed to produce 4.6 grams of P2O5
The 'a' of 'penta' is deleted when it occurs before 'o' as in 'oxide,' therefore 5.270 grams of P4 are required to generate 4.6 grams of P2O5.
P2O5: what is it in science?Many laboratory professionals are familiar with phosphorus pentoxide as a potent desiccant. It is produced by igniting elemental phosphorus in a dry air current. P2O5 can be found in a variety of crystal and amorphous forms, with crystalline P4O10 being the most prevalent.
Does every farmer require phosphorus?The need for phosphorus is essential to life. It is the P in ATP, the molecule that transports energy throughout cells, and the backbone of DNA. Since phosphorus is necessary for plant growth, farmers have been providing it to their crops for thousands of years.
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If you were to combine two carbon-12 atoms in a fusion process, what element would you get?.
The element would you get is Mg. 6C12 + 6C12 1 11Na24 + +1e0.
The first step in making carbon is to fuse the nuclei of hydrogen the lightest element to make helium the second lightest element. The next step is to fuse the two helium 4 nuclei. Each contains two protons and two neutrons. Forms beryllium-8. This takes in another helium and produces carbon-12.
The main problem in the carbon cycle is proton addition but after a carbon-12 nucleus fuses with a proton to form nitrogen-13 one of the protons decays to carbon-13 emitting a positron and a neutrino. Two more proton captures produce nitrogen-14 and then oxygen-15. Stellar Fusion Reactors In massive stars hydrogen burns to form helium. This produces carbon which can be further processed into oxygen and heavier elements.
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Manganese, Mn, forms two ions, one with a 2+ charge and one with a 3+ charge. What is the formula for manganese (II) sulfide?
Manganese, Mn, forms two ions, one with a 2+ charge and one with a 3+ charge. the formula for manganese (II) sulfide is MnS.
The manganese atomic number is 25. the manganese is the metal . metal have tendency to donate valence electron. manganese donate 2 electrons and form Mn⁺². The sulfur atomic number is 16. sulfur is nonmetal and tendency to accept electrons. sulfur accepts electrons and form S²⁻. The manganese and sulfur thus combines and form ionic compound. the formula for ionic compound manganese(II)sulfide is MnS
Thus, Manganese, Mn, forms two ions, one with a 2+ charge and one with a 3+ charge. the formula for manganese (II) sulfide is MnS.
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I am a number greater than
8 tens and 5 ones. I am
less than 8 tens and 7
ones.
Who am I?
Answer:
86
Explanation:
8 tens 7 ones 87
8 tens 5 ones 85
Right in the middle is 86
Hopes this helps please mark brainliest
Answer:
86
Explanation:
8 tens 7 ones 87
8 tens 5 ones 85
Right in the middle is 86
What is the difference between molecular shape/molecule geometry and electron group arrangement/electron geometry?.
We can determine how different electron groups are arranged with the aid of electron geometry. On the other side, understanding molecular geometry aids in understanding the complete atom and its configuration.
What distinguishes molecular form from molecular geometry?The main distinction between a molecule's shape and geometry is that a molecule's shape refers to its structure, excluding the lone pair on its central atom, but a molecule's geometry specifies how its lone pair and bond pair electrons are arranged around its central atom.
What distinguishes molecular geometry from electron geometry?The arrangement of the electron groups geometrically around the main atom is known as the electron geometry. The geometrical configuration of molecules is known as molecular geometry atoms surrounding the primary atoms.
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