Answer:
A
Antoine-Laurent Lavoisier
:D
The scientist was most essential to the use of radioactive isotopes in medicine is " John Lawrence's".
What is radioactive isotopes?The radioactive isotopes of such an element were called radioisotopes. Atoms that have too much energy in their nucleus or even an unstable neutron-proton pair.
It marked the beginning of John Lawrence's lengthy career of service and the first time a radioactive isotope had already been employed in the management of a human illness. His laboratory is regarded as the origin of nuclear medicine, for which he is regarded as its father.
The scientist most essential to the use of radioactive isotopes in medicine is " John Lawrence's".
To know more about radioactive isotopes.
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Identify the chromatography term that corresponds to each definition.
A value that quantifies the distance traveled by a substance relative to the distance traveled by the solvent Choose...
A method used to separate components of a mixture Choose...
The substance to which the sample is bound at the start of an experiment Choose...
The substance that carries the components of a mixture Choose...
Answer:
A value that quantifies the distance traveled by a substance relative to the distance traveled by the solvent- Retention factor
The substance to which the sample is bound at the start of an experiment- stationary phase
The substance that carries the components of a mixture- mobile phase
Explanation:
The retention is defined as a value that quantifies the distance traveled by a substance relative to the distance traveled by the solvent. It shows us how effective a solvent is at separating a mixture.
The stationary phase is the the substance to which the sample is bound at the start of an experiment. The solvent pick up the substance to be analyzed from this stationary phase. The different components of the mixture are found to move up the stationary phase at different speeds, causing them to eventually separate from each other.
The mobile phase is the substance that carries the components of a mixture during chromatography.
PLEASE HELP it’s due in 30 minutes
Answer:
1-6
3 1 3 3 2 2
Explanation:
Which of the following elements would be considered a compound? CH, Si, F, O6
Answer:
CH
Explanation:
CH, a typical sample of the compound contains one atom of carbon (C) to one atom of hydrogen (H).
Which of the following notations represents an alpha particle?
A. 2 He
C.B+
В. В
D. Y
Answer:
A. 2 He
Explanation:
The notation of an alpha particle is depicted as:
₂He
An alpha particles is a nucleus of 2 protons and 2 neutrons. So it is actually a Helium cation.
Alpha particles are monoenergetic and they mostly have discrete energy.
So, the mass number of the particle is 4 and atomic number is 2
Please help
15 points
Given
Atomic symbol
RequiredAtomic composition
Solution
Atomic number = number of protons = number of electrons
Mass Number (A) is the sum of protons and neutrons
Number of protons and Number of Neutrons in nucleus
Number of electrons in the shell
From the picture:
protons = 3
neutrons = 4
electrons = 3
atomic number = protons = electrons = 3
mass number = protons + neutrons = 3+4 = 7
A student determines the chromium(III) content of a solution by first precipitating it as chromium(III) hydroxide, and then decomposing the hydroxide to chromium(III) oxide by heating. How many grams of chromium(III) oxide should the student obtain if her solution contains 56.0 mL of 0.600 M chromium(III) nitrate?
Answer:
Explanation:
Chromium nitrate Cr( NO₃ )₂
Chromium hydroxide Cr( OH)₃
Chromium oxide ( Cr₂O₃ )
1 mole of chromium nitrate will form 1 mole of chromium hydroxide
1 mole of chromium hydroxide will form one mole of chromium oxide .
Moles of chromium nitrate in 56 mL of .6 M solution
= .056 x .6 = .336 moles
.336 moles of chromium nitrate will produce .336 moles of chromium hydroxide and .336 moles of chromium hydroxide will produce .336 moles of chromium oxide .
So chromium oxide produced = .336 moles
Molecular weight of chromium oxide = 152
.336 moles of chromium oxide is equal to
.336 x 152 grams of chromium oxide
= 51.07 grams .
What type of equation is this?
AlCl3 + NaOH → Al(OH)3 + NaCL
double
single
synthesis
decomp
combustion
Hurry I need Now!!!In which biome would the climax species be reached most quickly following a fire?
A Taiga
B desert
C Grassland
D. deciduous forest
E tropical rain forest
Answer:
D. Deciduous Forest.
Explanation:
Which part of the atom was discovered last?
Answer: The nuetron was
Explanation: sorry is this is incorrect but im
99% its right
What is the mass of 5 liters of fluorine (F2) gas at STP?
Answer:
The molar density of any ideal gas at STP is:
1 mol / 22.4 L = 0.04464 mol / L
The molar mass of F2 is: 2(19) = 38 g/mol
0.04464 mol / L * (38 g / mol) = 1.70 g/L
Explanation:
Why is the liquid oxygen machine producing less liquid oxygen than normal?
Answer:
Liquid oxygen evaporates at only a slightly higher temperature than liquid nitrogen because they have similarly low attraction between molecules. This would mean less liquid oxygen is coming out of tank 3 because some of it is evaporating as a gas instead.
The liquid oxygen machine is producing less liquid oxygen than normal because there's a low attraction between the molecules.
It should be noted that oxygen in its liquid state will take up less space. It can also be stored at a lower pressure than when it's in its gaseous state.
From the complete question, the liquid oxygen evaporates at a slightly higher temperature than the liquid nitrogen. The reason for this is due to the fact that they have similarly low attraction between molecules.
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what is 78%
of 100? help
Answer:
78
Explanation:
You have 100%, you take 22% and get 78%
Help pls!!!!!!!!!!!!!!!!!!!!!!!
Answer:
D a compound
Explanation:
In a laboratory experiment, students synthesized a new compound and found that when grams of the compound were dissolved to make mL of a diethyl ether solution, the osmotic pressure generated was atm at K. The compound was also found to be nonvolatile and a non-electrolyte. What is the molar mass they determined for this compound
The question is incomplete, the complete question is;
In a laboratory experiment, students synthesized a new compound and found that when 12.23 grams of the compound were dissolved to make 228.1 mL of a benzene solution, the osmotic pressure generated was 4.55 atm at 298 K. The compound was also found to be non-volatile and a non-electrolyte. What is the molecular weight they determined for this compound?
Answer:
287.76 g/mol
Explanation:
From;
π = M R T
M = molarity
R= gas constant
T = temperature
number of moles = π * volume/RT
number of moles = 4.55 * 228.1/1000/0.082 * 298
number of moles = 1.037855/24.436
number of moles = 0.0425 moles
Molar mass = mass/number of moles
Molar mass = 12.23 grams/0.0425 moles
Molar mass = 287.76 g/mol
Carbon monoxide and carbon dioxide have
Answer:
different chemical properties and the same physical properties
Explanation:
Both carbon monoxide and carbon dioxide are gases.
So physically, the two compounds have no fixed shape and volume and their molecules are far apart.
Therefore, they have similar physical properties.
Based on chemical properties, the compounds or molecules given are different.
They will combine chemically in diverse ways.
3. different chemical properties and the same physical properties
Physical properties:
Both carbon monoxide and carbon dioxide are gases. So physically, the two compounds have no fixed shape and volume and their molecules are far apart. Therefore, they have similar physical properties.Chemical properties:
The compounds or molecules given are different. They will combine chemically in diverse ways.Carbon Dioxide (CO₂) is a chemical compound consisting of one carbon atom and two oxygen atoms while Carbon Monoxide (CO) is a chemical compound which contains one carbon atom and one oxygen atom.CO is also a colorless and odorless gas while CO₂ is entirely human-made and is not naturally present in the atmosphere.Thus, both gases are chemically different.Therefore, option 3 is correct.
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what the the noble gas configuration for Boron
Answer:
[He]2[tex]s^{2}[/tex]3[tex]p^{1}[/tex]
Explanation:
The electron configuration for Boron is 1[tex]s^{2}[/tex]2[tex]s^{2}[/tex]3[tex]p^{1}[/tex], but you can also write it as the noble gas configuration, which is [He]2[tex]s^{2}[/tex]3[tex]p^{1}[/tex]
Note that helium has the configuration of 1[tex]s^{2}[/tex], so we instead of writing it, we write [He]. This can be useful when writing the configurations of elements from the later periods as it saves space.
A sample of compound A (a clear, colorless gas) is analyzed and found to contain 4.27g carbon and 5.69g oxygen. A sample of compound B (also a clear, colorless gas) is analyzed and found to contain 5.19g carbon and 13.84g oxygen. Are these data an example of the law of definite proportions, the law of multiple proportions, or neither? What do these data tell you about substances A and B?
Answer:
law of multiple proportions
Explanation:
The law of multiple proportions states that, if two elements A and B, combine to form more than one chemical compound. Then the various masses of one element A, which combine separately with a fixed mass of element B are in simple multiple ratio.
We can see that the ratio of oxygen that combines with carbon in the two compounds( A and B) is 1:2. This demonstrates the law of multiple proportions.
The substances A and B must be CO and CO2 respectively.
Helppp plssss pls help it’s Science I will give Brainlyist no cap I will just plssss help
Answer:
I cant see it that well but id be happy to help if u post a clearer picture!
Explanation:
50 points Two waves combine with constructive interference. What must be true of the
combined wave that forms?
A. It has a lower frequency than that of the original waves.
B. It has a higher amplitude than that of the original waves.
C. It has a higher frequency than that of the original waves.
D. It has a lower amplitude than that of the original waves.
Answer:B
Explanation:
Maybe
Answer:B is correct
Explanation:
metric conversion ( convert )
Answer:
13. 2g
14. 5000mL
15. 104,000m
16. 160mm
17. 5600000mg
18. 10hs
19. 0.250km
20. 1daL
Explanation:
13. 1000milligram (mg) = 1gram (g)
Hence, 2000mg = 2000/1000
= 2g
14. 1 litre (L) = 1000millilitre (mL)
Hence, 5L = 5 × 1000
= 5000mL.
15. 1kilometre (km) = 1000metre (m)
Hence, 104km = 104 × 1000
= 104,000m
16. 1 centimetre (cm) = 10millimeters (mm)
Hence, 16cm = 16 × 10
= 160mm
17. 1kilogram (kg) = 1000000 milligram (mg)
Hence, 5.6kg = 5.6 × 1000000
= 5600000mg
18. 1 second (s) = 0.01 hectosecond (hs)
Hence, 1000s = 1000 × 0.01
= 10hs
19. 1000metre (m) = 1kilometre (km)
Hence, 250m = 250/1000
= 0.250km
20. 1 centiliter (cl) = 0.001 Decaliter (daL)
Hence, 1000cl = 1000 × 0.001
= 1daL
Answer and I’ll give you brainliest!
What type of reaction is this *
N2 + H2 → NH3
O synthesis
O combustion
O decomp
O single
O double
show the formation of Mgion and Oion.
13) How many moles of CH3NH2 can be produced
from 24 moles of N2?
Answer:
To answer this question we would need the Molecular empirical formula that relates the reactant of N2 to the final product of CH3NH2. Then it would be easily solved by using stoichiometric ratios. Basically it is done similar to unit conversion problems.
How many moles are in 3.69 x 1022 atoms of Ag?
Answer:
I'm assuming that 1022 is supposed to be 10^22, or 10 to the 22nd power. If that is the case, then the answer is 0.0612956811 mol. Round it to the number that you are supposed to round it to.
What is the mass in grams of 2.5 mol of O2?
Answer:
80grams
Explanation:
RAM of O=16
molar mass of O2= 16×2=32g/mol
mass= mole × molar mass
= 2.5×32= 80g
If you travel through a city and find that you travel 5 km in 30 minutes, you could say that your constant speed is 6 km/h. is it true of false
Answer:
False.
Explanation:
(5 kilometers / 30 minutes), you could then say that in 60 minutes (one hour) you would be traveling at (10 kilometers / 60 minutes)...
Therefore, it is unlikely that you would be traveling at (6 kilometers / hour), so the answer should be... False.
1. I am a vertebrate
2. I can sprint up to 43 miles per hour
3. Although I have wings, I am flightless
4. I am a large animal that also lays very large eggs
Answer:
ostrich??????????????????
Energy can generally be considered to be either kinetic energy or potential energy. Some specific forms of energy, such as
electrical, magnetic, and gravitational energy, can operate in the space around objects and affect other objects that come near. In
these examples
A. energy is continuously created.
B. energy is continuously destroyed.
C. energy exists in a field.
D. all of these
Answer:
d hope it's right hope this helps
Answer:
Energy exists in a field.
Explanation:
Electrical field, magnetic field, and gravitational field.
A and B are wrong otherwise the law of conservation of energy would be violated
Why is HCI a strong acid and HCIO a weak acid?
Strong Acid: dissolves and dissociates 100% to produce protons (H+) 1. seven strong acids: HCl, HBr, HI, HNO3, H2SO4, HClO4, & HClO3 2. ... Weak Acid: dissolves but less than 100% dissociates to produce protons (H+) 1.
235U92 + 1N0 + 135Cs55 + 99Rb37 + x1n0
