A radioactive substances has half- life period of 30 days. the time required for 3/4th of the original number of atoms to disintegrate is 60 days.
Half life of radioactive substances T = 30 days
Time required for 3/4th t = ?
no. of atoms disintegrated = ( 3 / 4 ) N0
no. of atoms left after time t,
N = N0 -( 3/4) N0
= ( 1/4 ) N0
no. of half lives in time t ,
n = t / T
= t / 30
no. of nuclei after n half life is ,
N = N0× [tex](1/2)^{n}[/tex]
now, comparing both the equations,
[tex]N_{O}[/tex] / 4 = [tex]N_{O}[/tex] ( 1/2 )[tex]^{t/30}[/tex] = ( 2 )[tex]^{t/30}[/tex]
therefore,
[tex](2)^{2} = (2)^{t/30}[/tex]
now,
t/30 = 2
t = 60 days.
Thus, A radioactive substances has half- life period of 30 days. the time required for 3/4th of the original number of atoms to disintegrate is 60 days.
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the volume of water in a 100 ml graduated cylinder was recorded by several student in a group. their recorded volumes are similar, but vary by 0.01 ml
The volume of water in a 100ml graduated cylinder was recorded by several students in a group . thier recorded volumes are similar , but vary by 0.01 ml , this variation shows the uncertainty in measurements.
Uncertainty is defined as the quantification of the doubt about the measurement result. Error is the difference between a measurement result and the measured value and uncertainty describes the reliability of assertion that stated measurement result represents value of measured.
The marking on a 100 ml of graduated cylinder are every 1 ml . so the volume can be measured to the accuracy of ±0.01 ml .
Thus,The volume of water in a 100ml graduated cylinder was recorded by several students in a group . thier recorded volumes are similar , but vary by 0.01 ml , this variation shows the uncertainty in measurements.
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If your heart beats at a rate of 72 times per minute and your lifetime will be 70 years, how many times will your heart beat during your lifetime?
Answer:
2,649,024,000
Explanation:
Multiply 72*60*24*365*70
Distinguish between haploid and diploid
When an organism's cells only have one set of chromosomes, the organism is said to be haploid. All organisms that reproduce sexually are diploid (having two sets of chromosomes, one from each parent). Only the egg and sperm cells in humans are haploid.
The term "diploid" describes an organism's cells having two full sets of chromosomes, with one chromosome from each parent present in each pair. Since humans are diploid, the majority of their cells have 23 pairs of chromosomes.
Distinguish between haploid and diploid.
The number of chromosome sets found in the nucleus is the most obvious distinction between haploid and diploid cells. In contrast to diploid cells, which have two sets of chromosomes, haploid cells only have one set.The result of mitotic cell division is the formation of diploid cells. Following meiotic cell division, haploid cells are produced.Since there are two sets of chromosomes, there are two times as many chromosomes overall as there are in haploid cells. In comparison to diploid cells, there are half as many chromosomes because there is only one set present.To know more about haploid and diploid, click on the link below:
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Which item can only be observed using some kind of instrument?
1.heat from the Sun
2.the planet Venus
3.a radio signal
4.an earthquake
draw the major organic product formed from the formation of acebutolol with hcl. acebutolol is a β blocker used to treat high blood pressure. omit any inorganic counterions.
The major organic product formed from the formation of acebutolol with hcl is show in the picture.
Organic products are the compounds containing carbon to nitrogen, oxygen and halogen bonds.
Acebutolol hydrochloride is a selective, hydrophilic beta-adrenoreceptor blocker with mild intrinsic sympathomimetic activity, used in the treatment of patients with hypertension and ventricular arrhythmias.
It is a white, off-white powder which is freely soluble in water and slightly less soluble in alcohol, used to trat heart problems.Acebutolol is a β--blocker used to treat high blood pressure as it provides low grade β simulation when sympathetic activity is high.Chemical name for Acebutolol HCL is C₁₈H₂₈N₂O₄ · HClTo know more about organic product,
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Complete the following word equations
Magnesium + water
Answer:
Magnesium reacts with hot water or water vapour to form Magnesium hydroxide and hydrogen gas.
Explanation:
The actual temperature of a refrigerator is 37 deg f the tested temperature in deg f 39.1, 39.2, 39.2, 39.2, and 39.2 respectively this distribution shows
The actual temperature of refrigerator is 37°C and the tested temperature in °F 39.1, 39.2, 39.2, 39.2 and 39.2 respectively , this distribution show the Low accuracy and High precision.
Accuracy is defined as the , degree of closeness of the measured values to the actual value. In the given case the actual value is 37 °F and the measued values in °F are 39.1, 39.2, 39.2, 39.2, and 39.2, so here its shows the bad accuracy.
Precision is defined as the , closeness of measurements to each other measured values. Like in given case the measured values in °F are 39.1, 39.2, 39.2, 39.2 ans 39.2 , so, here there is a closeness in measured value so it show good precision .
Therefore,The actual temperature of refrigerator is 37°C and the tested temperature in °F 39.1, 39.2, 39.2, 39.2 and 39.2 respectively , this distribution show the Low accuracy and High precision.
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an atom is in its lowest energy state, or state, when its electrons are in the lowest possible energy levels. if an electron moves to a higher energy state the atom is said to be in a(n) state.
An atom's ground state is its lowest energy conceivable state, in which all of its electrons are at their lowest possible energy levels.
What degree of energy does an atom contain?The energy levels of the atoms match the rows of the Periodic List of Elements when you look at it. The last electrons of the two elements on the top row, hydrogen and helium, are filling their initial energy level.
The second energy level of the eight components in the second row is being filled. The chemical characteristics of an element are determined by its outermost electrons.
Starting with the level nearest to the nucleus, the energy levels were built up. By using the Aufbau Principle, electrons are filled in by moving from the initial lowest-energy level to a second, slightly higher energy level, and finally to the third, even higher energy level.
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photon has the frequency of 2.00 x 10^19 Hz, what is the energy and wavelength of this photon.
The energy and the wavelength of the photon would be 1.3252 ×10⁻¹⁴ Joules and 150 nanometers respectively.
What is the frequency?It can be defined as the number of cycles completed per second.It is represented in hertz and inversely proportional to the wavelength.
C=λν
λ = c / ν
Wavelength = 3×10⁸ / 2.00 x 10¹⁹
=1.5 x 10⁻¹¹
=150 nanometers
By using the Planck's energy formula,
E = hν
Where h is the Planck's constant with a value of 6.626×10⁻³⁴.
The energy of the Photon = 6.626×10⁻³⁴ ₓ 2.00x 10¹⁹
The energy of the Photon = 6.626×10⁻³⁴ ₓ 2.00 x 10¹⁹
=1.3252 ×10⁻¹⁴ Joules
Thus, the energy and the wavelength of the photon would be 1.3252 ×10⁻¹⁴ Joules and 150 nanometers respectively.
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Tough Tusion. 6. Consider the fission of uranium-235.
a. The fission of uranium-235 begins with the addition of a neutron to the nucleus. What isotope is formed? Give the isotope symbol.
b. After the neutron is added, the uranium atom is more unstable and undergoes fission. A possible set of products is krypton-94, barium-139, and 3 neutrons. How many protons are in these products?
c. Were any protons lost?
Uranium -236 (U-236) and the protons that are contained in the products are; krypton-36 and barium-56.
What is a fission reaction?The term fission refers to the process in which the nucleus of a larger element is bombarded with a small particle such as a neutron which causes the nucleus to become split. As the nucleus is split, smaller nuclei are able to be formed and this leads to the release of a tremendous amount of energy.
It should be known that fission reaction is one of the ways in which energy is released on a massive scale. While, it s true that fission reactions could be deployed on the negative scale such as in the production of the fission bombs, we should also know that it could be used positively to generate electricity in nuclear power plants.
The equation of the fission of uranium-235 begins with the addition of a neutron to the nucleus. What is then formed is uranium -236 (U-236). The protons that are contained in the products are; krypton-36 and barium-56.
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When purified cytochrome oxidase is exposed to cyanide, the cyanide binds reversibly and with high affinity to the enzyme’s active site. What will be the likely outcome if mitochondria are exposed to high levels of cyanide?.
The likely outcome if mitochondria are exposed to high levels of cyanide will be that the cyanide will prevent movement of electrons along the electron transport chain.
The majority of the chemical energy required to drive a cell's metabolic operations is produced by mitochondria, which are membrane-bound cell organelles (mitochondrion, singular). Adenosine triphosphate, a tiny molecule, serves as a storage container for the chemical energy generated by the mitochondria (ATP).
More than 90% of the energy in your body's cells is produced by mitochondria, which act as batteries in the cells. In high-energy-demanding organs including your heart, liver, muscles, and brain, mitochondria play a critical role. Mitochondria make about 25% of liver cells and 40% of heart muscle cells, respectively.
The unique compartments (organelles) in human cells called mitochondria are well recognised for acting as energy producers by disassembling food molecules and producing ATP, a fuel for the remainder of the cell
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The complete question is ''When purified cytochrome oxidase is exposed to cyanide, the cyanide binds reversibly and with high affinity to the enzyme's active site. What will be the likely outcome if mitochondria are exposed to high levels of cyanide?
A. The cyanide will prevent movement of electrons along the electron transport chain.
B. The cyanide will block movement of protons across the inner mitochondrial membrane.
C. The cyanide will inhibit transfer of electrons from NADH to initiate electron transport.
D. The cyanide will prevent oxygen from reaching the mitochondrial matrix.
PLS HURRY WILL MARK BRAINLIEST
What two terms describe how new cells are made?
Answer: Mitosis & meiosis
Explanation:
Answer:
I think it is cell division and mitosis
Explanation:
I hope this is right sorry if it isnt
The graph below shows how solubility changes with temperature.
A graph with the horizontal axis showing temperature ranging from 0 to 10 in units of 10 and the vertical axis solubility in grams of salt per 100 grams of water. Several compounds are shown. All data are approximate. The substances and their coordinates are as follows: upper N a upper C l: 0, 38; 10, 38; 20, 38; 30, 38; 40, 39; 50, 39; 60, 39; 70, 40; 80, 40; 90, 40; 100, 40. Upper N a subscript 2 upper H upper A s upper O subscript 4: 0, 5; 10, 18; 20, 28; 30, 39; 40, 49; 60, 65; 80, 82. Upper B a (upper N upper O subscript 3) subscript 2: 0, 5; 10, 8; 30, 12; 40, 15; 50, 18; 60, 20; 80, 28; 100, 33. Upper N a subscript 2 upper S upper O subscript 4: 0, 5; 5, 8; 10, 10; 15, 15; 20, 20; 25, 20; 28, 35; 30, 40; 32, 49; 33, 50; 35, 50; 40, 48; 50, 47; 60, 46; 70, 45; 80, 43; 90, 32; 100, 40. Upper C 3 subscript 2 (upper S upper O subscript 4) subscript 3 dot 9 upper H subscript 2 upper O: 0, 18; 20, 10; 30, 8; 50, 5; 60, 3; 80, 1; 100, 0.
Which two solutions have similar solubilities at 40°C?
Na2SO4 and NaCl
Na2HAsO4 and NaCl
Na2HAsO4 and Na2SO4
Ba(NO3)2 and Ce2(SO4)3 • 9H2O
Depending on the solubility at the temperature, 600 mL of saturated solution in NaCl must be prepare. Na₂HAsO₄ and Na₂SO₄ is the correct option.
The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility. Varying compounds have very different solubilities, which is a characteristic of a particular solute-solvent pair. The amount of a solute that dissolves in a specific volume of liquid is known as its solubility.
In terms of solubility, solute volume divided by solvent volume o
Saturated, unsaturated, and extremely saturated solutions are all possible.
The solubility of solutes increases as the temperature rises.
Depending on the solubility at the temperature, 600 mL of saturated solution in NaCl must be prepared.
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Answer:
C
Explanation:
Na2HAsO4 and Na2SO4
Explain why one redwood tree has almost the same density as a whole forest of redwood trees.
The density of one redwood tree has almost the same density as a whole forest of redwood trees because density does not change with the shape, size, and mass of an object.
What is density?“Density is characterized as a mass of a unit volume of an object.”
d = m/v
Where m = mass and v = volume
It is expressed as gram per cubic centimeter.
Density is a property that does not depend upon the amount of substance present.
Thus, due to the fact that density is independent of an object's shape, size, and mass, one redwood tree has nearly the same density as an entire forest of them.
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Four transmembrane regions changes conformation as gaba binds. which system is this process describing?
Ligand-gated ion channel is this process describing four transmembrane regions changes conformation as Gaba binds.
What are Gaba?In addition to being a ligand-gated ion channel, the [tex]GABA_A[/tex] receptor ( [tex]GABA_A[/tex] R) is an ionotropic receptor. Aminobutyric acid (GABA), the main inhibitory neurotransmitter in the central nervous system, is its endogenous ligand.
The postsynaptic cell's [tex]GABA_A[/tex] receptor opens up to chloride ions (Cl) and, to a lesser extent, bicarbonate ions (HCO3); this selective permeability is known as the [tex]GABA_A[/tex] receptor.
Depending on the membrane potential and the differential in ionic concentration, this may cause ionic fluxes across the pore. When the receptor is active, Cl will flow into the cell if the membrane potential is greater than the equilibrium potential, sometimes referred to as the reverse potential, for chloride ions.
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Methane, ch4, is the gas commonly found in labs to fuel bunsen burners. A) how many moles of methane are there in a 7. 21 gram sample?
Using the molar mass of methane, there are 0.45 mole of methane in a 7.21 gram sample.
Molar mass is defined as the mass per unit mole of a substance.
MM = m/n
where MM = molar mass
m = mass
n = number of moles
The molar mass of methane is the sum of the molar masses of each element.
C : 12.011
H : 1.00784
CH4 : 12.011 + 4(1.00784) = 16.04236 g/mol
If a sample of methane has a mass of 7.21 grams, using the formula for the molar mass, solve for the number of moles.
MM = m/n
16.04236 g/mol = 7.21 g/n
n = 7.21 g/16.04236 g/mol
n = 0.4494351205 mol
n = 0.45 mol
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Which of the following sequences describes how a four-stroke engine cycle
powers the engine?
The four-stroke engine cycle is defined by the following steps air and fuel intake, compression and ignition, combustion and expansion, and exhaust.
The correct option is B.
What is four stroke engine cycle?A four-stroke engine cycle is a style of engine in which the piston ignites internal combustion.
The entire piston travel along the cylinder is referred to as a stroke in an engine. The order in which the processes in the engine occur is as follows:
Injection: During this procedure, the engine is injected with both air and fuel.Ignition: After the intake materials are crushed, they are ignited.Fuel is burned after being ignited, and expansion occurs once more as a result of the products that are produced during the combustion event.Exhaust: In this stage, a piston forces the engine's burned gases out of the system.To know more about Four stroke engine visit:
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The complete question is-
Which of the following sequences describes how a four-stroke engine cycle powers the engine?
A. Expansion, air and fuel intake, compression and ignition,
extinguishment
B. Air and fuel intake, compression and ignition, combustion and
expansion, exhaust
C. Hydrogen and fuel intake, expansion, compression and ignition,
exhaust
D. Contraction, compression and ignition, air and fuel intake, exhaust
A student, Ken, is given a mixture containing two nitrate compounds . The mixture includes NaNO3 and Ca(NO3)2 . The mixture is 73.68% NO3 is by mass. What is the mass percent of NaNO3 in the mixture?
The mass percent of NaNO₃ in the mixture of the nitrate compounds 35.93 %.
What is the mass percent of NaNO₃ in a mixture of two nitrate compounds which includes NaNO₃ and Ca(NO₃)₂?The mass percent of NaNO₃ in a mixture of two nitrate compounds which includes NaNO₃ and Ca(NO₃)₂ is calculated as follows:
Mass percent of NO₃ = 73.68%
The number of parts of NO₃ in the mixture is 3 parts; 2 parts from Ca(NO₃)₂ and 1 part from NaNO₃.
1 part NO₃ = 73.68 %/3 = 24.56 %
Ca + Na = 100 - 73.8 = 26.2 %
molar mass of Ca = 40
molar mass of Na = 23
mass percent of Na = 23 * 26.2/53
mass percent of Na = 11.37 %
mass percent of NaNO₃ = 11.37 % + 24.56 %
mass percent of NaNO₃ = 35.93 %
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The road is 6 kilometers long. How
long is the road in meters?
Answer: It is 6000 meters
Explanation:
You multiply the length value by 1000
Polyacrylamide is a water-soluble polymer whose aqueous solution containing 25 g/l develops an osmotic pressure of 0. 54 torr at 25◦c. Find the approximate molecular weight of the polymer sample.
As the Cassini-Huygens spacecraft headed toward Saturn, it reached speeds of 5.2 kilometers per second. How many meters per minute did it travel at this speed?
The speed in number of meters per minute the spacecraft travel at the speed of 5.2 km per second is 3,12,000 meters per minute.
The speed is 5.2 km per second
We know that 1 kilometer per second is equal to 60000 meter per minute
So converting, we get 5.2×60000= 3,12,000 meters per minute
Conversion of units is the conversion between different units of measurement for the same quantity, typically through multiplicative conversion factors which change the measured quantity value without changing its effects.There is a multiplication factor introduced for the conversion of units through which it is converted.To learn more about unit conversion visit:
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Q+ is an ion of element Q. What has the highest value in the ion?
a. the nucleon number
b. the number of electrons
c. the number of neutrons
d. the proton number
The book says it's (the nucleon number) but I can't seem to know why.
The highest value of the ion is the nucleon number. The correct option is a.
What is nucleon number?The mass number of an element is so named because it represents the total number of protons and neutrons in the element.
The total number of protons and neutrons in an atomic nucleus is known as the mass number, also known as the atomic mass number or nucleon number. It is roughly equivalent to the atomic mass expressed in atomic mass units.
In the given ion Q+, the nucleon number has the highest value in the ion
Thus, the correct option is a.
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I in Ca(IO3)2 is ?
Answer
And workout
Ca(IO3)2 is Calcium iodate
I in Ca(IO3)2 is Iodate.
The oxidation number of O in Ca(IO3)2 is -2. The oxidation number of I in Ca(IO3)2 is +5. The oxidation number of Ca in Ca(IO3)2 is +2. The oxidation state is the atom's charge after ionic approximation of its bonds. The oxidation number of H is +1 when combined with more electronegative elements (e.g. non-metals) it is -1 in when combined with less electronegative elements (e.g. metals).
Calcium iodates are inorganic compound composed of calcium and iodate anion. Two forms are known, anhydrous Ca(IO3)2 and the monohydrate Ca(IO3)2(H2O).
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a student practicing for cross country meet runs 250 m in 30 s . what is her avarge speed
Answer:
8 1/3 m per second
Explanation:
You divide 250 by 30
A researcher wants to experiment with an element that reacts like sodium (na) but has a greater atomic mass. which element should the researcher select for the experiment?
Answer: iodine
Explanation:
calculate the force of attraction in n between a cation with a valence of 2 and an anion with a valence of 3 the centers of which are separated by a distance of 6.9 nm
The force of attraction in between a cation with a valence of 2 and an anion with a valence of 3 would be 1.5 x [tex]10^{-10}[/tex] N.
Force of attractionAccording to Coulomb's law constant,
k = 9 x 10^9 Nm^2/C^2
The magnitude of the charge of an electron is
e= 1.6 x 10^9 C
The magnitude of the electric force (F) between the cation and the anion is given by
F = k Q^2/d^2
= k 2e^2/d^2
= (9 x 10^9 Nm^2/C^2) x 10^9 x {2x (1.6 x 10^-19)^2}/ (2.5)^2
= 1.5 x 10^-10 N
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Why is an acid able to produce ions in aqueous solution? assume that the general formula of an acid is given by ha, where a is usually a halogen or oxygen atom.
Acids separate into ions in water or other aqueous solutions. These are in charge of how electricity conducts through them. In the absence of water, acids do not dissociate hydrogen ions. We can therefore state that acids exclusively create ions in watery solutions.
The polar H-A bond breaks due to the attraction between H and the O of water
An aqueous solution is one in which water serves as the solvent. Chemical equations typically illustrate it by adding (aq) to the appropriate chemical formula. For instance, Na +(aq) + Cl might be used to indicate a solution of table salt, or sodium chloride (NaCl), in water (aq).
Aqueous solutions are those in which water serves as the solvent. Even though water is a great solvent, not everything readily dissolves in it.
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Sodium phosphate reacts with sulfuric acid to form sodium sulfate and phosphoric acid. What is the stoichiometric coefficient for sulfuric acid when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?.
Answer:
dividing the number of moles of each reactant
Explanation:
1. Based on our lab to find the volume of objects, which object had the greatest volume?
The cube, rectangular prism, cylinder, cone, pyramid, and sphere are the fundamental geometric shapes for which volume formulas are known.
Which object had the largest volume?An object's volume is the amount of space it occupies. Cubic meters are used to measure large volumes (m3). Cubic centimeters (cm3) or cubic millimeters are used to measure smaller volumes (mm3). For instance, a cup is said to have a 100 ml capacity if its brim can carry 100 ml of water used to describe volume. The 3-dimensional space inhabited by matter or encircled by a surface is measured by its volume.
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Explain the meaning of crude oil and petro chemicals
Crude oil is a mixture of hydrocarbons whereas Petrochemicals are made primarily from hydrocarbons but also from other chemical substances.
A mixture of hydrocarbons known as crude oil is one that is found in naturally occurring subsurface reservoirs in the liquid phase and continues to be liquid at atmospheric pressure after passing through surface separating equipment.Heating oils, gasoline, diesel, and jet fuels, lubricants, ethane, propane, and butane, as well as numerous other products utilised for their energy or chemical content, are all produced from crude oil through refinement.Crude oil is among the most significant fuel sources globally and historically made for more than a third of the world's energy use.Chemicals derived from petroleum and crude oil are known as petrochemicals.Olefins and aromatics are two categories for petrochemicals, which are substances made from petroleum.Products made from petrochemicals range in complexity from explosives to something as basic as plastic carry bags.Learn more about hydrocarbons here:
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