To reduce 100 mg of benzil to benzoin, the theoretical mass of NaBH4 needed is approximately 0.423 g.
:
To calculate the theoretical mass of NaBH4 required, we need to consider the stoichiometry of the reaction and the molar masses of the compounds involved.
The balanced chemical equation for the reduction of benzil using NaBH4 is:
C14H10O2 + 4 NaBH4 -> C14H12O2 + 4 NaBO2 + 8 H2
From the equation, we can see that 1 mole of benzil (C14H10O2) reacts with 4 moles of NaBH4 to produce 1 mole of benzoin (C14H12O2).
First, let's calculate the molar mass of benzil:
Molar mass of benzil (C14H10O2) = (14 * 12.01 g/mol) + (10 * 1.01 g/mol) + (2 * 16.00 g/mol) = 228.23 g/mol
Next, we calculate the amount of benzil in moles:
Mass of benzil = 100 mg = 0.100 g
Moles of benzil = mass / molar mass = 0.100 g / 228.23 g/mol ≈ 0.000438 mol
Since the stoichiometry of the reaction is 1:4 (benzil to NaBH4), the moles of NaBH4 required can be calculated as follows:
Moles of NaBH4 = 4 * moles of benzil ≈ 4 * 0.000438 mol ≈ 0.00175 mol
Finally, we calculate the mass of NaBH4:
Molar mass of NaBH4 = (1 * 22.99 g/mol) + (1 * 1.01 g/mol) + (4 * 1.01 g/mol) + (1 * 4.00 g/mol) = 37.83 g/mol
Mass of NaBH4 = moles of NaBH4 * molar mass of NaBH4 = 0.00175 mol * 37.83 g/mol ≈ 0.0661 g ≈ 0.423 g (rounded to three decimal places)
Therefore, the theoretical mass of NaBH4 needed to reduce 100 mg of benzil to benzoin is approximately 0.423 g.
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what is the answer to this ?
Answer:
it is either d or c
Explanation:
Answer:
im pretty sure its 31
just add up the masses then divide by 3
Explain why this statement is false.“Because there is no change in composition during a physical change, the appearance of the substance will not change.”
The element carbon exists in several different forms. Pure carbon can be found in the form of diamonds, coal, and the graphite in your pencil. Which statement concerning carbon is FALSE?
A) All carbon atoms have 6 protons.
B) All carbon atoms have 6 neutrons.
C) All carbon atoms have an atomic mass equal to the number of protons and neutrons.
D) All carbon atoms have an atomic number of 6.
Answer:
B) All carbon atoms have 6 neutrons.
Explanation:
The false statement from the given choices is that all carbon atoms have 6 neutrons.
There is a phenomenon called isotopy in chemistry.
Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.
These atoms of elements are called isotopes. Carbon atoms generally have proton number of 6 which is the same as the atomic number. As with all atoms, the mass number or atomic mass equals the number of protons and neutrons.For the isotopes of carbon, their number of neutrons differs.
For example:
¹²₆C ¹³₆C ¹⁴₆C
The number of neutrons differs in the above isotopes.
Number of neutrons = mass number - atomic number;
¹²₆C , number of neutrons = 12 - 6 = 6
¹³₆C, number of neutrons = 13 - 6 = 7
¹⁴₆C, number of neutrons = 14 - 6 = 8
Therefore, based on the concept of isotopy, all carbon atoms do not have 6 neutrons.
Column A 1. Reproduction: Reproduction 2. offspring: offspring 3. gamete: gamete 4. Budding: Budding 5. Binary fission: Binary fission 6. zygote: zygote 7. fragmentation/regeneration: fragmentation/regeneration 8. mitosis: mitosis 9. meiosis: meiosis Column B a.Bacteria b.Egg or sperm cell/ specialized cells c.A new living organism d.Sea star/ planarian e.Female and male create mini-me by cell division f.The original cell after egg cell and sperm cell join g.One or two parents, organisms make new offspring h.Hydra i.Healling and growth occurs in budding
Answer:
1. Reproduction: One or two parents, organisms make new offspring
2. Offspring: A new living organism
3. Gamete: female and male create mini-me by cell division
4. Budding: Hydra
5. Binary fission: Bacteria
6. Zygote: The original cell after egg cell and sperm cell join
7. Fragmentation/Regeneration: Sea star / Planarian
8. Mitosis: Healling and growth occurs in budding
9. Meiosis: Egg or sperm cell/ specialized cells
Explanation:
1. Reproduction is the process by which organisms make new offspring either sexually (involving two parents) or asexually (involving one parent only).
2. An Offspring is a new living organism
3. A gamete is a mature sexual reproductive cell, as a sperm or egg, that unites with another cell to form a new organism. It formed from female and male parents by cell division known as meiosis
4. Budding is a form of asexual reproduction in which a new offspring grows out from a part of the parent. It occurs in Hydra.
5. Biinary fission is a form of asexual reproduction which involves a separation of the parent into two new offspring. It commonly occurs in Bacteria
6. Zygote is the original cell formed after egg cell and sperm cell fuse.
7. Fragmentation/Regeneration: this is a form of reproduction in which a parent splits into fragments which are then able to develop into new organisms. It occurs in Sea star and Planarians
8. Mitosis is a form of cell division which a cell divides into two identical daughter cells with the same genetic components as the parent cell. It functions in healing and growth as well as in budding
9. Meiosis is a type of cell division that results in the production of sex cells or gametes. The number of chromosomes in the parent cell is halved and four gamete cells are produced. Egg or sperm cell/ specialized cells are produced by meiosis.
Energy is released during which phase changes? Check all that apply.
boiling
condensing
depositing
freezing
melting
subliming
Answer:
Condensing, depositing, and freezing
Explanation:
Answer:
B C D
Explanation:
condensing
depositing
freezing
Copper has a specific heat of 0.385 J/gºC.
If 7.67 kJ of energy is applied to an 62.0 g sample of copper originally at 26.7 °C, what
will its final temperature be?
Answer:
The final temperature is 348.024°C.
Explanation:
Given data:
Specific heat of copper = 0.385 j/g.°C
Energy absorbed = 7.67 Kj (7.67×1000 = 7670 j)
Mass of copper = 62.0 g
Initial temperature T1 = 26.7°C
Final temperature T2 = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
Q = m.c. ΔT
7670 J = 62.0 g × 0.385 j/g °C ×( T2- 26.7 °C )
7670 J = 23.87 j.°C ×( T2- 26.7 °C )
7670 J / 23.87 j/°C = T2- 26.7 °C
T2- 26.7 °C = 321.324°C
T2 = 321.324°C + 26.7 °C
T2 = 348.024°C
The final temperature is 348.024°C.
Why are constants important during an investigation
Answer:
Control Constants Control constants or control variables are quantities a researcher holds steady during an experiment. Even though the value or state of a control constant may not change, it is important to record the constant so the experiment may be reproduced. Examples: temperature, day/night, duration of a test, pH
Answer:
TL;DR: In a science experiment, the controlled or constant variable is a variable that does not change. For example, in an experiment to test the effect of different lights on plants, other factors that affect plant growth and health, such as soil quality and watering, would need to remain constant.
Plutonium-242 (242Pu) undergoes alpha decay to form what daughter isotope and decay particle?
Answer:
Decay. Plutonium-242 primarily decays into uranium-238 via alpha decay, before continuing along the uranium series.
Explanation:
please mark as brainlist
11. The strength of a force is measured in
Answer:
In units.
Explanation:
Such as newtons or pounds.
The strength of the force is basically expressed by magnitude. The correct option is B.
A force's magnitude, which denotes its size, intensity, or quantity, is used to represent its strength.
A force's magnitude is a scalar quantity, which means that it is characterized purely by its numerical value and unit of measurement.
Forces are commonly quantified in Newtons (N) in the context of physics. The magnitude of a force indicates how powerful or weak the force is, regardless of its direction.
The direction of a force, on the other hand, denotes the line or route along which the force acts. While direction is crucial in understanding the overall influence of forces, magnitude measures the strength and determines the force's impact on an item or system.
Thus, the correct option is B.
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Your question seems incomplete, the probable complete question is:
The strength of the force is expressed by?
(A). Direction
(B). Magnitude
(C). Both
(D). None
If it rains, then practice is cancelled that day.
It rains on Thursday. What can you conclude?
Answer:
I can conclude practice was cancelled on Thursday
Explanation:
Since the sentence says "If it rains, practice is cancelled that day" since its raining on Thursday, practice is cancelled for Thursday
hope this helps :)
Find the number of atoms of each element in 180g na2so4
Answer:
Explanation:
There really are no atoms. Some are ions. However at your level, I think you are expected to answer something connected to 6.02 * 10^23
First Find the mass of one mole
Na: 2 * 23 = 46
S: 1 * 32 = 32
O: 4* 16 = 64
Total 142
Next Find the number of Moles
1 mole has a mass of 142
x mole have a mass of 180
Cross Multiply
142 * x = 180 * 1
x = 180 / 142
x = 1. 27 moles.
Next figure out the number of atoms in 1.27 moles of Na2SO4
Na: 2 * 1.27 * 6.02 * 10^23 = 1.53 * 10^24
S : 1 * 1.27 * 6.02 * 10^23 = 7.6 * 10^23
O: 4 * 1.27 * 6.02 * 10^23 =3.05 * 10^24
Total 5.34*10^24
cientific Investigations
7
Katrina finds the following passage in a science textbook
There are many ways to conserve water. One way that people can save water is to reuse it. For example, instead of pouring
the old water from a pet's bowl down the sink, use it to water a plant. Another way to cut down on water use is to collect
rainwater A large barrel can be placed under a downspout to catch the rain. The collected rainwater can be used to wash a car
or water the lawn A third way to save water is to choose outdoor water activities wisely. Instead of playing in the sprinklers, swim
in a pool The sprinklers must run water continuously, but once a pool is filled, the water can be used again and again. One last
way to prevent water waste is to stop flushing unnecessary items down the toilet. Toilets use a lot of water when they flush. Do
not flush insects or used Kleenex down toilets. Following these suggestions will save gallons of water
What is this passage suggesting about tap water?
It has more energy than hydrogen gas
B
it is not an important resource
C. It is a limited resource
It is an unlimited resource
Answer:
C, it is a limited resource.
Explanation:
The___ is the female reproductive organ that produces egg cells.
Answer:
ovaries...
Explanation:
Answer:
Ovaries
Explanation:
Hope this helped
You should run an experiment several times to make sure your
results are consistent and reliable. In the preceding phrase, what
does 'consistent' mean?
O obvious
O sporadic
O unchanging
O testable
Plz help
Answer:
O unchanging
Explanation:
The experiment results cannot change, otherwise the experiment would be inconclusive.
why chlorine is more reactive than hydrogen
Answer:
Hi Todoroki here!!!
Explanation:
Chlorine has the electron configuration [Ne]3s 2 3p 5, with the seven electrons in the third and outermost shell acting as its valence electrons. Like all halogens, it is thus one electron short of a full octet, and is hence a strong oxidising agent, reacting with many elements in order to complete its outer shell.
Your welcome!!
The surface temperature of a star is indicated by which characteristic?
a
absolute brightness
b
color
c
shape
d
size
Answer:
B. Color
Explanation:
We can estimate the temperature of a star by looking at the color of the star.
Red stars are the least hot among stars and Blue stars are the hottest.
Choose the atom with the larger ionization energy. Silicon (Si) or Sulfur (S)
Answer:
silicon (Si)
Explanation:
Sulfur is known to have to smallest amount of radius, therefore silicon has the largest ionization energy.
What is an example of an element in a microscopic form and macroscopic form.
Answer:
as examples of substances in the macroscopic scale, we can give names of any substance that we see from a single strand of hair to a large vehicle
As examples of substances on a microscopic scale, we can give microorganisms such as bacteria, fungi, viruses, etc.
You can find vinegar and baking soda in most kitchens, but are they
chemicals? Explain.
That’s the question, and please help! If you answer please explain it so I can actually understand and answer the question and my work. Thank you!
Answer:
Yes
Explanation:
Because they both react with something
Determine the volume of an 85-gram sample of gold at ST
M
Answer:
Volume of gold is 9.64 L .
Explanation:
Given data:
Mass of gold = 85 g
Temperature = standard = 273 K
Pressure = standard = 1 atm
Volume of gold = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will calculate the number of moles of gold.
Number of moles = mass/molar mass
Number of moles = 85 g/ 197 g/mol
Number of moles = 0.43
1 atm × V = 0.43 mol ×0.0821 atm.L/ mol.K × 273 K
V = 9.64 atm.L / 1 atm
V = 9.64 L
. An atom can be called a particle, but a molecule is never called a particle.
Answer:
it's because a particle is a very small matter piece, and an atom is a very small piece of matter, but a particle is some atoms joined together to make a substance, but a particle, which is made from atoms, can't be called atoms.
Explanation:
solve the quadratic equation 2x^2+13x=15 by method of completing the square
Answer:
x = 1, -7.5
Explanation:
2x² + 13x = 15
Divide the left side of the equation by 2
2(x² + 6.5x) = 15
Divide 6.5 by 2 and square the quotient
6.5/2 = 3.25
3.25² = 10.5625
Add 10.5625 to the left side
2(x² + 6.5x + 10.5625) = 15
Since you have a 2 outside the parentheses, you will be adding 10.5625•2 to the right side.
10.5625 • 2 = 21.125
2(x² + 6.5x + 10.5625) = 36.125
To factor (x² + 6.5x + 10.5625), add b/2 to x
b/2 = 6.5/2 = 3.25
2(x + 3.25)² = 36.125
Divide by 2
(x + 3.25)² = 18.0625
Square root.
(x + 3.25) = √18.0625
x + 3.25 = ±4.25
Subtract 3.25.
x = 4.25 - 3.25 = 1
x = -4.25 - 3.25 = -7.5
x = 1, -7.5
The Valence Electron shell is the first shell next to the nucleus. true or false
helpppppp helpppppp helppppp
where is the diagram?
without the diagram i can't help
Answer:
1. Aorta
2. Right ventricle
3. Right ventricle
4. Right ventricle
5. Left ventricle
Explanation:
i believe these are correct because i got the same answers on my test
Help me out in this problem
Answer:
The light rays are refracted in the water
Explanation:
The reason why the spoon is bent in the water is due to the refraction of light rays in water.
Refraction is a property of waves in which they bend as they cross from the boundary of one medium to another.
Usually, when light rays passes from a less dense medium to a denser one, the rays are bent towards the normal.
The rays which forms the spoon in the water will be bent as it passes through the air - water boundary. This is why the spoon would be seen as bent.whenn he said yes would go
Answer: I said god bless him
Explanation:
The tables show the mass, volume, and appearance of four unknown substances and the densities of four known substances.
Using the tables, what is unknown substance S?
Answer:
Substance S is GLYCEROL.
Explanation:
To know what substance S represent, let us determine the density of substance S.
From the question given above, the following data were obtained:
Mass of S = 92.09 g
Volume of S = 73.09 mL
Density of S =..?
Density = mass /volume
Density of S = 92.09/73.09
Density of S = 1.26 g/mL
Finally, we shall determine what substance S represent as follow:
Comparing the density of substance S (i.e 1.26 g/mL) with those given in question above, substance S is GLYCEROL.
Which lists mixtures, in order, from the smallest particles to the largest particles?
A. solution, colloid, suspension
B. solution, suspension, colloid
C. suspension, colloid, solution
D. suspension, solution, colloid
Answer:
A. Solution, Colloid, Suspension
Hope i could help
Answer:
its A
Explanation:
got it right on edge, i hope this helps
define the following terms using specific examples to help with your explanation:
a element
b metal
c non-metal
d compound
Answer:
Element: Elements are the pure substances that cannot be broken to its smaller ones. e.g. sodium, hydrogen etc.Metals: metals are substances that belong to the left part of the periodic table. metals conduct heat and electricity. they are usually solid at room temparature. Group I and II metals are soft and can be cut by a knife. e.g. Sodium, Zinc, copper etc. Non-Metal: non-metals belong to the right side of the periodic table. They do not conduct electricity and are usually liquid and gas at room temparature. e.g. Oxygen, helium, Iodine etc.Compounds: Compounds are new substances formed when two or more different elements are chemically combined. eg. Sodium Chloride, Calsium Sulphate etc.
the potential energy in molecules is stored in...
Energy, potential energy, is stored in the covalent bonds holding atoms together in the form of molecules. This is often called chemical energy. Except at absolute zero (the coldest temperature it is possible to reach), all molecules move.
Answer:
Chemical energy
Explanation:
Energy, potential energy, is stored in covalent bonds holding atoms together in the form of molecules
