When a Kr-89 captures an electron, the particle that is formed is bromine with atomic number of 35.
What is radioactivity?Radioactivity is the spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
The radiation emitted includes the following;
gamma raysalpha particlesneutronselectronspositronsAn electron is a negatively charged subatomic particle that can be either bound to an atom or free (not bound). It has a charge of -1.
According to this question, when a Kr-89 captures an electron, the particle formed can be deduced as follows:
89/36Kr + 0/-1e = 89/35Br
This suggests that the particle formed when a particle of krypton captures an electron is bromine.
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Why add ammonia to test solution when checking the percent copper in a penny
Answer: it erases the blue oxidized copper and returns it to its pristine original look
Explanation:
The more cooper there is the better the ammonia will work
What is the wavelength of a microwave that has a frequency of 4.2 x 10^8 Hz
Answer:
0.714 m (app.)
Explanation:
use ∧ = c/f
here, ∧ = wavelength
c = velocity of light = 3 × 10^8 m/s
f = frequency = 4.2 × 10^8 Hz
Which one is stronger 1.starch or inulin and 2. Cellulose and inulin?helppppp
Answer:
depends on the type of insulin, but your normal low everyday kind strach is stronger then insulin is stronger than cellulose
Which pair of molecules can form a hydrogen bond with one another
Here's some examples
CH, OH, FH, etc
What is the ppm concentration when 7.0 x 10 "-3g" of sodium chloride is dissolved in a solution with a volume of 2
The ppm concentration of the sodium chloride solution, given that 7.0×10⁻³ g is dissolved with a volume of 2 L is 60 ppm
How do I determine the concentration in ppm?To obatin the concentration in ppm, we'll begin by obtaining the mole of the sodium chloride in the solution. This can be obtained as follow:
Mass of sodium chloride = 7.0×10⁻³ gMolar mass of sodium chloride = 58.5 g/molMole of sodium chloride =?Mole = mass / molar mass
Mole of sodium chloride = 7.0×10⁻³ / 58.5
Mole of sodium chloride = 0.00012 mole
Finally, we shall determine the concentration in ppm. This can be obtained as follow:
Mole of sodium chloride = 0.00012 moleVolume of solution = 2 LConcentration (in ppm) =?Concentration (in ppm) = (mole of solute / volume) × 10⁶
Concentration (in ppm) = (0.00012 / 2) × 10⁶
Concentration (in ppm) = 60 ppm
Thus, we can conclude that the ppm concentration is 60 ppm
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Find the volume of 0.240 M sulfuric acid necessary to react completely with 75.5 g sodium hydroxide.
The volume of the 0.240M sulfuric acid required to completely react with sodium hydroxide will be
Firstly we will write the correct balanced equation for the reaction:
2NaOH + H₂SO₄ ==> Na₂SO₄ + 2H₂O
Next, determine moles of NaOH present:
75.5 g NaOH x 1 mole NaOH/151 g = 0.5 moles NaOH
Next, determine number of moles H₂SO₄ needed to react with 0.5 moles NaOH,
0.5 moles NaOH x 1 mole H₂SO₄ /2 moles NaOH = 0.25 moles H₂SO₄ needed
Finally, calculate the volume of H₂SO₄ needed to provide 0.25 moles H₂SO₄:
(0.240 mole/L)(x L) = 0.25 moles
Molarity= 0.25/ volume
volume = 0.25/ molarity
= 0.25/ 0.24
=1.04 L
= 1040 mL
So, the volume of the given solute required to completely react with sodium hydroxide will be 1040 mL.
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Choose the statement that best reflects how energy is involved with chemical bonds.
A. Energy is needed to break bonds.
B. Energy is released when bonds are broken.
C. Energy is formed in the breaking of bonds.
D. Energy plays no role in chemical bonds.
Energy is needed to break bonds, is the best exemplifies the interaction of energy with chemical bonds.
What is chemical bond?
An enduring attraction between ions or atoms known as a chemical bond is what allows molecules and crystals to form. The bond may be created by the sharing of electrons in covalent bonds or by the electrostatic attraction of two oppositely charged ions, as in ionic bonds. Covalent, ionic, and metallic bonds are examples of "strong bonds" or "primary bonds," whereas dipole-dipole interactions, the London dispersion force, and hydrogen bonding are examples of "weak bonds" or "secondary bonds." The sharing or exchange of electrons between the involved atoms results in strong chemical bonds. The negatively charged electrons that surround the nucleus as well as the positively charged protons that make up a nucleus are attracted to one another because opposite electric charges are attracted to one another.
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Macmillan Learning
A 2.95 L container at 734 °C contains 5.10 g of N₂0,(g). The N₂O, gas decomposes completely, producing NO₂(g) and
NO(g). Assuming the container volume and the temperature do not change, calculate the pressure of the gas mixture after the
complete decomposition of N₂O,.
The container volume and the temperature do not change, the pressure of the gas mixture after the complete decomposition of N₂O is 3 atm.
The reaction is given as :
2N₂O ----> 2N₂ + O₂
volume = 2.95 L
temperature = 734 + 273 = 1007 K
mass = 5.10 g
moles = mass / molar mass
= 5.10 / 44
= 0.11 mol
using ideal gas equation here:
P V = n RT
P = (0.11 × 0.082 × 1007) / 2.95
P = 3 atm
Thus, The container volume and the temperature do not change, the pressure of the gas mixture after the complete decomposition of N₂O is 3 atm.
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Select the correct answer.
How many electrons does a covalent bond consist of?
O A.
OB.
O C.
O D.
one
two
four
eight
How many moles of a gas are in a 4.2L container at 310K at 0.36atm? *
*R value = 0.082 (atm x L)/ (mol x K)
0.357 mol
0.0594 mol
O1.872 mol
M
Considering the ideal gas law, the correct answer is the second option: 0.0594 moles of a gas are in a 4.2L container at 310K at 0.36atm
Ideal gas lawAn ideal gas is called a hypothetical or theoretical gas, which would be composed of particles that move randomly and without interacting with each other.
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. The universal constant of ideal gases R has the same value for all gaseous substances. n is the number of moles of the gas.Amount of moles in this caseIn this case, you know:
P= 0.36 atmV= 4.2 Ln= ?R= 0.082 (atm×L)/(mol×K)T= 310 KReplacing in the ideal gas law:
0.36 atm× 4.2 L = n× 0.082 (atm×L)/(mol×K)× 310 K
Solving:
(0.36 atm× 4.2 L)÷ (0.082 (atm×L)/(mol×K)× 310 K)= n
0.0594 moles= n
Finally, the number of moles of gas is 0.0594 moles.
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How many moles of Mn are there in a sample of Mn that contains 3.80×1024 atoms?
There are moles of Mn in a sample of Mn that contains 3.80 × 10²⁴ atom is 6.31 moles.
How to calculate number of moles?The number of moles in a substance can be calculated by dividing the number of atoms of that substance by Avogadro's number, which is equivalent to 6.02 × 10²³ atoms.
No of moles = no of atoms ÷ 6.02 × 10²³
According to this question, there are 3.80 × 10²⁴ atoms in manganese element. The number of moles in this substance is as follows:
no of moles = 3.80 × 10²⁴ ÷ 6.02 × 10²³
no of moles = 6.31 moles
Therefore, 6.31 moles is present in 3.80 × 10²⁴ atoms of manganese.
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If a sample of a certain solution is determined to have a pH of 11.4, what is the concentration of [H3O+] in the solution? Write your answer in scientific notation and
round the significand to two decimal places.
Answer
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the concentration of [H3O+] in the solution is [tex]10^{11.4}[/tex]. pH is a unitless quantity
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
Mathematically,
pH=-log[H⁺]=11.4
Solving this
[H⁺]=[tex]10^{11.4}[/tex]
Therefore, the concentration of [H3O+] in the solution is [tex]10^{11.4}[/tex].
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Please help I need help like right now!!
There are 0.0449 mole LiCIO4 and 0.135 mol H2O in the sample. Step 3: Divide each by the smallest number of moles to get the ratio.
What is the ratio of LICIO4:H2O? ?] mol LiClO4: [ ? ] mol H2O
The whole number mole ratio of LiCIO₄ to H₂O in the sample of the compound is 1 : 3.
What is the mole ratio of a reaction?The mole ratio of the reaction is the ratio in which moles of reactants combine to form moles of product.
The mole ratio of the given reaction is calculated below as follows:
Moles of LiCIO₄ present in the sample of the compound = 0.0449 mole LiCIO₄
Moles of H₂O present in the sample of the compound = 0.135 mol H₂O
To get the whole number mole ratio, we divide each mole of substance present in the sample by the smallest number of moles.
Mole ratio of LiCIO₄ = 0.0449 mole / 0.0449 mole
Mole ratio of LiCIO₄ = 1
Mole ratio of H₂O = 0.135 / 0.0449
Mole ratio of H₂O = 3
Hence mole ratio of LiCIO₄ to H₂O in the sample = 1 : 3
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in a newspaper, the prosecutor said, “Trace evidence is what was really important in this case. Without it, the suspect would not have been found guilty.” Based on this statement, what MOST likely happened in this case?
A.
The murder weapon was found at the suspect’s home.
B.
Multiple witnesses claimed to have seen the suspect commit the crime.
C.
A piece of the suspect’s hair was found on the victim’s body.
D.
There was video footage of the suspect leaving the victim’s home.
Trace evidence in the above case refers to the piece of the suspect’s hair that was found on the victim’s body.
Trace Evidence Analysis is the field of forensic science that deals with the minute transfers of materials that cannot be seen with the human eye. The handling and analysis of trace evidence requires care and specialized techniques. Trace evidence may provide a link between the victim and a suspect, a victim and a scene, or the suspect and a scene.
Thus with the help of trace trace evidence we can identity the suspect.
It is not uncommon for people to shed hair throughout the day. The ease of transfer of this type of evidence makes it very useful in criminal investigation. Forensic testing of hairs involves identification of human versus animal hair and also the comparison of microscopic features to differentiate between hairs from different individuals. Once comparison is completed, hair with follicular tags can be sent to the Nuclear DNA Unit for analysis.
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ASAP PLEASEEEEE HELP
Leaving the doors open while the air conditioner is on in a home represents?
A. an loop system
B. an open system
C. an closed system
D. an isolated system
Option B: an open system
What is the mass of 1.81 x 1023
molecules of nitrogen, N2? The molar
mass of N2 is 28.02 g/mol.
The mass of nitrogen, N₂ that contains 1.81×10²³ molecules is 8.42 g
How do I determine the mass of nitrogen, N₂?From Avogadro's hypothesis,
6.02×10²³ molecules = 1 mole of nitrogen, N₂
But
1 mole of nitrogen, N₂ = 28.02 g
Thus,
6.02×10²³ molecules = 28.02 g of nitrogen, N₂
With the above information, we can obtain the mass of nitrogen, N₂ that contains 1.81×10²³ molecules as follow:
6.02×10²³ molecules = 28.02 g of nitrogen, N₂
Therefore,
1.81×10²³ molecules = (1.81×10²³ × 28.02) / 6.02×10²³
1.81×10²³ molecules = 8.42 g of nitrogen, N₂
Thus, we can conclude that the mass of nitrogen, N₂ is 8.42 g
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Calculate the molecular formula for a compound whose empirical formula is CH2O and molar mass is 150.0 g/mol.
Step 1: Calculate the molar mass for the empirical formula.
What is the molar mass of CH2O?
(C=12.01 amu, H=1.01 amu, O=16.00 amu) [?] g/mol CH₂O
The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.
Considering the question given above, the following data were obtained:
Empirical formula = CH₂O
Molar mass of compound = 150 g/mol
Scaling factor (n) =?
Empirical formula × n = molar mass
[CH₂O]n = 150
[12 + (2×1) + 16]n = 150
[12 + 2 + 16]n = 150
30n = 150
Divide both sides by 30
n = 5
Therefore, the scaling factor is 5
A scale factor is a ratio between corresponding measurements of an object and a representation of that object.In chemistry, the empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound. .Learn more about empirical formula at:
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Develop your understanding: Open the Isotopes screen, then explore to develop your own ideas about “isotopes”
1. Which element does the image below represent?
Please harry please
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. First image represent oxygen element and second picture represent fluorine element.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In first image the number of protons are 8 which is of oxygen element. In second image the number of protons are 9 which is of Fluorine element.
Therefore, first image represent oxygen element and second picture represent fluorine element.
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A sample of ideal gas is in a sealed container. The pressure of the gas is 735 torr , and the temperature is 6 ∘C . If the temperature changes to 74 ∘C with no change in volume or amount of gas, what is the new pressure, P2 , of the gas inside the container?
Express your answer with the appropriate units.
The final pressure of the gas is 914 torr. This is obtained by the use of the ideal gas equation and its parameters.
What is the ne pressure?The ideal gases are those kind of gases to which we can be able to apply the ideal conditions. Let us recall that the laws of the ideal gas pertains to the gases that are in the ideal condition. This implies that the gases are at a low pressure and a high temperature.
Now we have that;
Initial pressure P1 = 735 torr
Final pressure of the gas P2 = ??
Initial temperature of the gas T1 = 6 ∘C or 279 K
Final temperature of the gas T2 = 74 ∘C or 347 K
Then by the use of the formula;
P1/T1 = P2/T2
P1T2 = P2T1
P2 = P1T2/T1
P2 = 735 * 347 /279
P2 = 914 torr
The pressure that the gas would have at the end of the process is 914 torr.
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A beaker weighed 53.10g. To the isolated beaker was added 5.348g of iron pellets and 56.1g of hydrochloride acid. What was the total mass of the beaker and the products after reaction?
114.5 g is the total mass of the beaker .
Total mass of beaker=53.10g+5.348g+ 56.1g
Total mass=114.5 g
Mass is used in physics to specific inertia, a fundamental function of all remember. basically, it's far a mass of rely's resistance to changing its course or pace in response to the software of a force.
The exchange that an applied force produces is smaller the extra mass a body has. The kilogram, the unit of mass within the international machine of gadgets, corresponds to 6.62607015 1034 joule seconds using Planck's consistent (SI). One joule is produced by way of multiplying one kilogram by means of one rectangular meter per 2d.
The kilogram is decided by genuine measurements of Planck's regular on account that the second one and the meter have formerly been described in phrases of other bodily constants.
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chemical reaction NaCl (aq) + AgNO3 (aq)
The given reaction is a double displacement reaction where, Cl and NO₃ group displaces between and sodium and silver atoms. The complete reaction is written as follows:
[tex]\rm NaCl (aq) + AgNO_{3} (aq) \rightarrow AgCl (s) + NaNO_{3} (aq)[/tex].
What is double displacement reactions?There are various kinds of reactions classified based on the way of regrouping of atoms in the reactants. In a double displacement reaction, two species from the reactant side are displaced of each other.
The reaction between sodium chloride and silver nitrate gives sodium nitrate in aqueous form and the precipitate of silver chloride. Here the groups nitrate and chlorine displaces between sodium and silver. Hence it is a double displacement reaction.
The net reaction represents the formation of the silver chloride precipitate.
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Use the periodic table to determine which of the following could be an isotope of bromine (Br). Check all that apply.
Z = 79, A = 196
Z = 35, A = 79
A = 79, N = 44
Z = 44, N = 44
The isotopes of bromine from the options would be Z = 35, A = 79.
What are isotopes?Isotopes are atoms of the same element with the same atomic number but different neutron numbers.
The atomic number of an atom is the number of protons present in the nucleus of the atom. Since elements are arranged according to their atomic number on the periodic table, isotopes of the same element will occupy the same position on the periodic table.
Now, considering the isotope of bromine (Br). The atomic number is 35. The atomic number is denoted as Z on the periodic table. The normal bromine atom has a mass number of 80. With 35 as the number of protons, the number of neutrons can be calculated as:
80 - 35 = 45.
Considering an atom with Z = 35, A = 79, means the atomic number is 35, which means it is a bromine atom. The mass number is 79 instead of 80.
79 - 35 = 44.
This means that the atom has 44 as the neutron number instead of 45. Thus, Z = 35, A = 79 is the only isotope of bromine.
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If 6.92 mol of C5H12 reacts with excess O2, how many moles of CO2 will be produced by the following combustion reaction? C5H12+8O2⟶6H2O+5CO2
If 6.92 mol of C₅H₁₂ reacts with excess O₂, number of moles of CO₂ will be produced by the following combustion reaction is 34.6 mol.
The balanced reaction is given as:
C₅H₁₂ + 8O₂ ---> 5CO₂ + 6 H₂O
Moles of C₅H₁₂ = 6.92 mol
1 mole of C₅H₁₂ produces 5 moles of CO₂
therefore , 6.92 mol of C₅H₁₂ = 5 × 6.92 mol
= 34.6 mol of CO₂
number of moles of CO₂ = 34.6 mol
Thus, If 6.92 mol of C₅H₁₂ reacts with excess O₂, number of moles of CO₂ will be produced by the following combustion reaction is 34.6 mol.
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A volume of 85.0 mL of H2O is initially at room temperature (22.00 ∘C ). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.20 ∘C , what is the mass of the steel bar?
The mass of the steel bar is 26.7 g.
the specific heat capacity expression is given as :
Q = m c ΔT
Q steel = Q water
where,
specific heat for water = 0.452 J/ g ° C
specific heat capacity for steel = 4.18 J/ g ° C
Q steel = -Q water
m c ΔT = - m c ΔT
85 × 0.452 × (19.2) = m × 4.18 ×0.8
mass of steel = 26.7 g
Thus, A volume of 85.0 mL of H2O is initially at room temperature (22.00 ∘C ). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.20 ∘C , the mass of the steel bar is 26.7 g.
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Tricarbon Octasulfide: How many carbons?
* Tricarbon Octasulfide: How many carbons
The Tricarbon Octasulfide: number of carbons is 3.
The tricarbon octasulfide is C₃S₈. The tricabon octasulfide contains three carbons in the molecular formula. carbon is the element with the chemical symbol C is place in the group 14 and the period second in the periodic table. the atomic number of carbon is six. tri carbon is an inorganic compound with the chemical formula C₃ having three carbon atoms. carbon is used as the fuel in the form of coal , methane . carbon is a non metal and the state of carbon is solid state at room temperature.
Thus, The Tricarbon Octasulfide: number of carbons is 3.
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1. How many days would it take to count 10Lb of rice grains? A single grain of rice weighs 0.000064 lb (6.4x10-5 lb) Assume: 1grain/second
If a single grain of rice weighs 0.000064 lb and assuming 1 grain of rice is counted per second, the number of days to count 10 lb of rice would be 1.8084 days.
Dimensional analysisAccording to the analysis:
1 grain = 0.000064 lb
This means that 0.000064 lb is counted per second according to the rate given.
There is a total of 10 lb of rice, how many 0.000064 lb can be deducted from 10 lb?
10/0.000064 = 156250
In other words, there are 156250 grains of rice in total.
1 grain = 1 sec
How many seconds will it take to count 156250 grains?
156250 x 1 = 156250 seconds
60 seconds = 1 minute
60 minutes = 1 hour
124 hours = 1 day
Total number of seconds in a day (24 hours) = 60 x 60 x 24
= 86400 seconds
So, how many 86400 seconds can be deducted from 156250 seconds?
156250/86400 = 1.8084
Thus, it will take a total of 1.8084 days to count 10 lb of rice grains.
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What are the two substances produced through photosynthesis? A. water. B. sugars. C. oxygen. D. carbon dioxide.
SC.8.P
2. Construct Arguments Suppose you are a
construction worker. You use aluminum for a
window frame, copper for wiring, and iron for
nails. Use the properties of these materials to
justify their specific uses.
The aluminum use for a window frame , copper for wiring and iron for nail because of they are malleable , ductile, good conductor of electricity and high energy efficiency.
The aluminum is used for window because aluminum is malleable and the aluminum have high energy efficiency. The copper is used as for the wiring because the copper is the good conductor of the electricity. The iron is use for the nail because iron is hard and have the tendency to resist the corrosion.
Thus, The aluminum use for a window frame , copper for wiring and iron for nail because of they are malleable , ductile , good conductor of electricity and high energy efficiency.
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The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. However, given the same kinetic energies, a lighter molecule will move faster than a heavier molecule, as shown in the equation for rms speed
rms speed = square root 3RT/M
where R = 8.314 J/(mol•K) and M is molar mass in kilograms per mole. Note that a joule is the same as a kilogram-meter
squared per second squared (kg•m²/s²).
What is the rms speed of Cl₂ molecules at 411 K?
What is the rms speed of He atoms at 411 K?
The RMS speed of Cl₂ and He molecules at 411 K is 379.97m/s and 1600 m/s
In a gas, the root-mean-square speed is used to calculate particle speed, which is defined as the square root of the common velocity squared of the molecules in the gas. It is represented mathematically as vrms=3RT/M.
The average kinetic energy of gas molecules is proportional to temperature and inversely proportional to molecular weight.
The root mean square(RMS) speed of the molecule in a gas can be calculated using the following formula
Rms speed = √(3RT/M)
Here R is the gas constant, T is the absolute temperature and M is the molar mass of the gas molecule in kg/mol
Now we have to calculate the RMS speed of Cl₂ molecules at 411 K? and the RMS speed of He atoms at 411 K.
At 411 K, the RMS speed of Cl2 molecules is
RMS speed = √(3RT/M)
=√((3 x 8.314 x 411)/(71 x 10-3 ))
=√(10251.162/0.071)
= √144382.563
= 379.97m/s
RMS speed of He molecules at 411 K
RMS speed = √(3RT/M)
=√((3 x 8.314 x 411)/(4 x 10-3 ))
=√(10251.162/0.004)
= √2562790.5
= 1600 m/s
Therefore the RMS speed of Cl₂ and He molecules at 411 K is 379.97m/s and 1600 m/s
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Question attached, chemistry :(
Answer:
jar 1 = barium chloride
jar 2 = potassium bromide
jar 3 = calcium iodide
Explanation:
Electronegativity (EN): A measure of an atom's ability to attract electrons (or electron density) toward itself. On the Pauling scale, fluorine is the most electronegative element (EN = 4.0) and cesium and francium are the least electronegative elements (EN = 0.7).