The work of John Lawrence scientist was most essential to the use of radioactive isotopes in medicine.
Which scientist use of radioactive isotopes in medicine?John Lawrence was the first scientist that use a radioactive isotope in the treatment of a human disease. He became known as the father of nuclear medicine and his laboratory is considered the birthplace of this field.
So we can conclude that the work of John Lawrence scientist was most essential to the use of radioactive isotopes in medicine.
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Newton law of motion
Answer:
newtons law states that every body in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to square of the distance between their centers
Answer:
an object at rest tends to stay at rest
What is the name of this hydrocarbon?
hexane
O heptane
O octane
O pentane
Mark this and return
H H H H H
|||||
H-C-C-C-C-C-H
|||II
H H H H H
Save and Exit
Next
Submit
Answer:
alkanes alkens alkenes and a bromatic hydrocarbons
Answer:
[tex]\huge\boxed{\sf Pentane}[/tex]
Explanation:
The given compound has:5 carbonsall single bondsPrefix for 5 carbons = Pent
Suffix for all single bonds = ane (since the compound is alkane)
So, the name of this hydrocarbon is:
Pentane[tex]\rule[225]{225}{2}[/tex]
How many moles FeBr3 are required
to generate 275 g NaBr?
2FeBr3 + 3Na₂S → Fe₂S3 +6NaBr
Answer:
0.893mol
Explanation:
n = m ÷ M
= 275 ÷ (23 + 80)
= 2.67 mol
* now use the Mol ratio *
NaBr : FeBr3
6 : 2
2.67 : x
5.67 = 6x
n( FeBr3 ) = 0.893 mol
What is the independent variable for boiling temperature of water as salt is adddd
The independent variable is the different amounts of salt that will be added to the water.
What is a variable?A variable is any characteristic, number, or quantity that can be measured or counted.
The independent variable is the different amounts salt that will be added to the water (what is done by the scientist).
The dependent variable is the boiling temperature of the water (what is being measured).
HYPOTHESIS: If salt is added to water then, the boiling temperature is lowered.
Hence, the independent variable is the different amounts of salt that will be added to the water.
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HELP FAST PLEASE! If a reaction takes place and the theoretical yield is 73 g and the actual yield is 62 g, calculate the percent yield.
Choices:
A. 76%
B. 1.16%
C. 116%
D. 85%
Answer:
A
Explanation:
I think it's A. There are good answer for A.
The chemical formula for a emerald is BeAl2(SiO3)6.
An emerald can be described as
Emerald can be described as a transparent, green coloured gem stone made up of mineral beryl together with trace amount of chromium or sometimes vanadium having chemical formula as [tex]Be_3Al_2(SiO_3)_6[/tex] .
Through time, the emerald has been known as a symbol of truth and love.
In ancient Greece and Rome, emerald was said to be the gemstone of the goddess Venus, purveyor of love and hope.
On the other side of the world, emeralds were revered by the Incas and believed by the Egyptians to be a source of eternal life.
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anyone? got an answer
How do you separate a honey and water solution?
Answer:
Keep it undisturbed for some time and let it settle down. Then use a separating funnel, to separate them both
Explanation:
the ability to roll your tongue allele T is dominant to the allele t inability to roll your tongue. if mother is a homozygous tongue roller TT and father tt can't roll his tongue. what possible offspring will they have?
Answer:
homozygote
Explanation:
Because tongue-rolling is recessive, the only way a person would be unable to roll his/her tongue would be if s/he were homozygous mutant.
Which compound contains only nonpolar covalent bonds?.
Answer:
02 or oxygen if im not mistaken
predict the missing component in the nuclear equation
The answer is C since both charge and mass have to be balanced on both sides of the equation.
Describe the reasoning behind using phosphorus and boron in conjunction
with one another.
defective greatest formerly knows sd ghost;
The cutoff frequency for a certain
element is 1.22 x 1015 Hz. What is its
work function in eV?
Hint: 1 eV 1.60 x 10-19 J
[?] eV
The cutoff frequency for a certain element is 1.22 x 1015 Hz this is its
work function in eV that is Work done = 5.05 eV.
What is supposed through a piece function?Definition of labor function is the power this is wished for a particle to return back from the indoors of a medium and spoil via the surface —used particularly of the photoelectric and thermionic emission of electrons from metals paintings function.
Work function = hfh= planks constant.f= frequency.W = 6.626 10^-34 1.22* 10^15.W = 8.08 10^-19 / ( 1.6 10^-19)W = 5.05 eV.Read more about work:
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9- Which pair of formulae represents two alkanes? (1 mark)
A)CH4 and C8H18
B)C₂H6 and C5H8
C) C3H6 and C5H12
D) C₁0H8 and C4H8
Answer:
A) CH4 and C8H18
Explanation:
General Formula for an Alkane = CnH2n+2This means for every number of Carbon (C) atoms, there are twice as many Hydrogen (H) atoms with an additional two added onto that.Therefore, if there is one Carbon Atom, and we multiply that by two, and then add an additional two, we get 4 Hydrogen atoms, so CH4, which is our first FormulaeSecondly, if we have eight Carbon Atoms, and we multiple that by two (16), and then add an additional two, we get 18 Hydrogen atoms, so C8H18, which is our second FormulaeThe other Formulas do not follow this 'General Formula'what are the 3 common gases that give off reactions?
The 3 common gases that give off reactions are Hydrogen sulfide, Carbon monoxide, Nitrogen oxides.
What are off reactions
Off reactions are defined as chemical reactions that occurs when something burns or during combustion of materials which gives off energy.
Some gases that give off reaction are:
Hydrogen sulfideCarbon monoxideNitrogen oxidesNote that these gases are mostly poisonous.
Therefore, the 3 common gases that give off reactions are Hydrogen sulfide, Carbon monoxide, Nitrogen oxides.
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How many moles of electrons are transferred when 2.0 moles of aluminum metal react with excess copper(II) nitrate in aqueous solution to form Al(NO3)3(aq) and Cu(s)
Moles of electrons:
The moles of electrons that are transferred are 12F
A balanced equation:
2 moles of Aluminium metal react with excess copper(II) nitrate.
[tex]2Al + 3Cu{(NO_3)}_2 \rightarrow 2Al{(NO_3)}_3 +3 Cu[/tex]
Given:
Moles of Aluminium = 2
As Aluminium goes from 0 to +3 oxidation state
[tex]Al \rightarrow Al^{3+} + 3e^-[/tex]
And copper goes from +2 to 0
[tex]Cu^{2+} + 2e^-\rightarrow Cu[/tex]
On balancing the number of electrons we get:
For 1 mole of Al [tex]6e^-[/tex] is required.
Therefore for 2 moles of Al,
Total [tex](2\times6)[/tex]F mole of electrons
Where F= Faraday's constant= 96500 C
So, 12F moles of electrons are transferred.
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What is the molar volume of a gas at standard temperature and pressure? 1.0 L2.4 L11.2 L22.4 L
The molar volume of a gas at standard temperature and pressure is 22.4L
Molar volume of a gas at STP
Because the particles in gases are compressible, they can be driven to enclose one another when subjected to high pressure. As a result, the volume of the gas is smaller and there is less free space. The temperature has an impact on gas volume as well. A gas expands as a result of its molecules moving more quickly when it is heated. The comparison of gas volumes must be done at standard temperature and pressure due to the variation in gas volume caused by variations in pressure and temperature. The definition of standard temperature and pressure (STP) is (273.15K) and 1atm pressure. The volume of one mole of a gas at STP is its molar volume. A mole (6.02 x 10^23 typical particles) of any gas takes up 22.4L at STP.
using ideal gas law:-
PV =nRT
P = 1.00atm
n = 1.00 mol
R = 0.0821 L atm/mol K
T = 273 K
V = ?
V = nRT/P
V = (1.00 x 0.081 x 273)/1.00
V = 22.4 L
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The ideal gas law only approximates the behaviour of real gases. The conditions
under which the ideal gas law is MOST accurate are
Answer:
I d K
Explanation:
How much energy is required to heat 36. 0 g h2o from a liquid at 65°c to a gas at 115°c? the following physical data may be useful.
The required energy will be "87752 J".
What is energy?The definition of energy is "ability to do work," which is the capacity to apply a force that causes an item to move.
Mechanical, heat, chemical, electrical, radiant, nuclear, and sound are the seven types of energy.
The energy will be:
Q1 = 36 × 3.18(100-65)
Q1 = 5267 J
Moles of water = [tex]\frac{36.0}{18}[/tex]
Moles of water = 2
then,
Q2 = 2× 40.7
Q2 = 81.4 KJ
Q2 = 81400 J
Q3 = 36.0 × 2.01(115-100)
Q3 = 1085 J
hence,
Required energy will be= Q1+ Q2+ Q3
Required energy = 5267 + 81400 + 1085
Required energy = 87752 J
hence, 87752 J energy is required to heat 36. 0 g h2o from a liquid at 65°c to gas at 115°c.
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Identify the reaction type for each unrelated, radical reaction as either initiation, propagation, or termination. Reaction A. A chlorine chlorine bond splits into two chlorine radicals. What type of reaction is reaction A
A is the initial reaction when a chlorine bond splits into two chlorine radicals.
What are radicals?In chemistry, a radical is an atom, molecule, or ion that has an unpaired valence electron.
The question is based on Radical Chain Reaction. And these reactions have three different phases: Initiation, Propagation and Termination.
Reaction A- Initiation
Reaction B- Termination
Reaction C- propagation
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what is the molarity of the NaOH
the answer is:
40 g/mole
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From the calculations, the percentage of the mineral left is 6.25%.
What is half life?The term half life refers to the time that it takes for only half of the number of radioactive isotopes to remain.
From;
N/No = (0.5)^t/t1/2
N = ?
No = ??
t = 2000
t1/2 = 500
N/No =(0.5)^(2000/500)
N/No = 0.0625
Thus the percent left = 0.0625 * 100 = 6.25%
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Which of the following is NOT an example of pseudoscience?
A. Psychics
B. Healing crystals
C. Vaccines
D. Acupuncture
Answer:
I think its vaccines
• Reflect on the importance of stoichiometry and rate of chemical reaction in the design of car airbags
Answer:
If an insufficient amount of nitrogen were produced, the air bag would under inflate and not provide adequate protection. Clearly, the stoichiometry of the reaction is very important.
Which formula represents the compound commonly known as phosphine with iupac name phosphorus trihydride? ph ph2 ph3 ph4
C. PH3 represents a compound commonly known as phosphine, whose IUPAC name is phosphorus trihydride.
What type of bond is PH3?The electronegativity of PH3 found in the Periodic Table of the Period attracts covalent electron pairs and creates covalent bonds. However, because the electrons are not bound, asymmetrical rate distribution occurs. Therefore, PH3 is a polar molecule with a non-polar covalent bond and currently has no polar bond.
What defines a covalent bond?A covalent bond consists of sharing one or more electron pairs between two atoms. These electrons are attracted to two nuclei at the same time. Covalent bonds are formed when the difference in electronegativity between two atoms is too small for electron transfer to form ions.
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Answer:
C.) ph3
Explanation:
A distillation column with a partial reboiler and a total condenser is being used to separate a mixture of benzene, toluene, and 1,2,3-trimethylbenzene. The feed, 40 mol% benzene, 30 mol% toluene, and 30 mol% 1,2,3-trimethylbenzene, enters the column as a saturated vapor. We desire 95% recovery of the toluene in the distillate and 95% of the 1,2,3-trimethylbenzene in the bottoms. The reflux is returned as a saturated liquid, and constant molar overflow can be assumed. The column operates at a pressure of 1 atm. Find the number of equilibrium stages required at total reflux, and the recovery fraction of benzene in the distillate. Solutions of benzene, toluene, and 1,2,3-trimethylbenzene are ideal.
Answer:
11.8.4 Distillation Columns
Distillation columns present a hazard in that they contain large inventories of flammable boiling liquid, usually under pressure. There are a number of situations which may lead to loss of containment of this liquid.
The conditions of operation of the equipment associated with the distillation column, particularly the reboiler and bottoms pump, are severe, so that failure is more probable.
The reduction of hazard in distillation columns by the limitation of inventory has been discussed above. A distillation column has a large input of heat at the reboiler and a large output at the condenser. If cooling at the condenser is lost, the column may suffer overpressure. It is necessary to protect against this by higher pressure design, relief valves, or HIPS. On the other hand, loss of steam at the reboiler can cause underpressure in the column. On columns operating at or near atmospheric pressure, full vacuum design, vacuum breakers, or inert gas injection is needed for protection. Deposition of flammable materials on packing surfaces has led to many fires on opening of distillation column for maintenance.
Another hazard is overpressure due to heat radiation from fire. Again pressure relief devices are required to provide protection.
The protection of distillation columns is one of the topics treated in detail in codes for pressure relief such as APIRP 521. Likewise, it is one of the principal applications of trip systems.
Another quite different hazard in a distillation column is the ingress of water. The rapid expansion of the water as it flashes to steam can create very damaging overpressures.
What does it mean when a solution is saturated?
O The container is full.
O No more solute can dissolve in solvent.
O The solute has turned into a solid.
O The solvent has turned into a solid.
Answer:
A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.
Explanation:
What is the wavelength of an electromagnetic wave that has a frequency of 7.80 * 10 ^ 14 Hz in a vacuum? (The speed of light in a vacuum is 3.00 * 10 ^ 8 m/s.)
A. 1.22 * 10 ^ - 15 * m
B. 3.85 * 10 ^ - 7 * m
C. 2.34 * 10 ^ 23 * m
D. 2.60 * 10 ^ 6 * m
Answer:
B.) 3.85 x 10⁻⁷ m
Explanation:
To find the wavelength, you can use the following formula:
wavelength = speed of light / frequency
Since you have been given both the speed of light and frequency, you can plug these values into the equation to find wavelength.
wavelength = speed of light / frequency
wavelength = (3.00 x 10⁸ m/s) / (7.80 x 10¹⁴ Hz)
wavelength = 3.85 x 10⁻⁷ m
You are trying to determine how
many moles of lithium nitrate are in
256 mL of a 0.855 M solution.
How many liters is 256 mL?
Answer:
0,218 moles
Explanation:
I will first explain how many liters is 256ml, that is 0,256 l.
because the m stands for milli which is a factor of 1000 -> (256 ml / 1000 = 0,256 l)
To calculate the amount of moles you multiply the volume with the concentration. So 0,256l x 0,855M = 0,218 moles.
Answer: 0.256
Explanation:
Match the zone to its characteristics.
Horse latitudes
Subpolar low
Doldrums
?
?
?
Heavy precipitation, little
wind
The trade winds and
westerlies originate here
Lies along the polar jet
stream
The zone and its characteristics include the following:
Subpolar low: Lies along the polar jetstream.Horse latitudes: The trade winds and westerlies originate here.Doldrums: Heavy precipitation, little wind.What is Horse latitude zone?This is referred to regions which is located at about 30 degrees north and south of the equator and forms the basis of westerlies.
The other zones such as doldrums are also found at the equator with their respective features and can be seen above. This therefore makes it the most appropriate choice.
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