Answer:
Option d. is correct
Explanation:
Nitromethane is an organic compound that can be used as a fuel booster in rockets. Its chemical formula is [tex]CH_3NO_2[/tex].
This compound is produced as a result of reaction of sodium chloroacetate with sodium nitrite in aqueous solution.
The electron-dot structure of a nitromethane molecule shows [tex]+1[/tex] charge on the nitrogen.
Option d. is correct
How does temperature effect the molecules of a substance that is dissolved.
Explanation:
Generally, temperature increases the rate of any chemical reaction considerably.
In a dissolution process, the solute is solvated in the solvent. Solutes are usually the solids or liquids being dissolved in the solution.
When temperature increases, the average kinetic energy of the solvent molecules increase also. The indicator of the average kinetic energy in a body is heat. As molecules begins to move rapidly, it brings both the solvent and solute in contact faster with each other.The energy level diagram shown below represents a fictional gas. What is the energy of a photon that would move an electron from level 2 to level 5?
A. 5.8 eV
B. 4.8 eV
C. 4.2 eV
D. 2.65 eV
The energy of a photon that would move an electron from level 2 to level 5 : B. 4.8 eV
Further explanationThe electron energy at the nth shell can be formulated:
En = -Rh / n²Rh = constant 2.179.10⁻¹⁸ J
So the electron transfer energy (ΔE)
ΔE = E final- E initial
energy at n=2(level 2) = -5.3 eV
energy at n=5(level 5) = -0.5 eV
So the energy absorbed :
[tex]\tt \Delta E=-0.5-(-5.3)=-0.5+5.3=4.8`eV[/tex]
The energy required to move an electron from level 2 to level 5 is 4.8 eV.
According to the Bohr model of the atom, an electron moves from a lower to a higher energy level when it absorbs energy. The same energy is released when the atom returns to ground state.
When an electron from level 2 to level 5, the energy of the photon required is;
ΔE = E5 - E2 = -0.5eV - (-5.3eV)
ΔE = 4.8eV
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Where do karst regions occur?
Answer:
Image result for Where do karst regions occur?
Karsts are found in widely scattered sections of the world, including the Causses of France; the Kwangsi area of China; the Yucatán Peninsula; and the Middle West, Kentucky, and Florida in the United States.
Explanation:
Answer:
Middle West Kentucky.
Explanation:
Karst are found in widely scatter sections of the world.
Plz what’s the answer to this
Answer: E
Explanation:hope this helps you out
What is the compound name for HgCl2
Answer:
Mercury Chloride
Explanation:
Trust me, this answer is correct.
Suppose of sodium chloride is dissolved in of a aqueous solution of silver nitrate. Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the sodium chloride is dissolved in it. Be sure your answer has the correct number of significant digits.
Suppose of sodium chloride is dissolved in of a aqueous solution of silver nitrate. Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the sodium chloride is dissolved in it. Be sure your answer has the correct number of significant
What is pure convalent bond
Answer:
Pure covalent bonds exist between two atoms with the same electronegativities. A pure covalent bond has no ionic character at all. Diatomic elements are good examples of pure covalent bonds where the electrons are evenly shared between both nuclei.
Explanation:
Hope this helped!
what does the word "local" mean
Answer:
belonging or relating to a particular area or neighborhood, typically exclusively so
Explanation:
write a short paragraph about your daily activities nowadays
Ones day my include eating, resting, exercising. Unfortunately mine included not eating, not sleeping, and not exercising. I lay wife awake on my bed wishing for deaths door to find me sooner than later. I do my chores because if I don’t then my parents may take away the few things I love most. In conclusion, my daily activities include thoughts of “ why am I still alive” and actions of crying, punching ext.
Demonstrate how you can prepare 250ml 0.25M hydrogen peroxide from a solution of 20g/100ml of hydrogen peroxide.
To prepare 250 ml 0.25 M hydrogen peroxide, 10.63 ml of 20g/100 ml hydrogen peroxide has been taken and made up the volume to 250 ml.
The dilution of the sample can be prepared with the help of expression:
M1V1 = M2V2
M1 = molarity of the concentrated solution
V1 = volume of concentrated solution
M2 = molarity of diluted solution
V2 = volume of diluted solution.
The molarity of concentrated solution has been:
Molarity = [tex]\rm \dfrac{weight}{molecular\;weight}\;\times\;\dfrac{1000}{Volume\;(ml)}[/tex]
The 20g/100 ml Hydrogen peroxide has molarity:
Molarity = [tex]\rm \dfrac{20}{34.0147}\;\times\;\dfrac{1000}{100}[/tex]
Molarity of Hydrogen peroxide = 5.879 M
The volume of 5.879 M hydrogen peroxide is required to prepare 0.25 M hydrogen peroxide has been:
Volume of Hydrogen peroxide (20g/100 ml) [tex]\times[/tex] 5.879 = 250 ml [tex]\times[/tex] 0.25 M
Volume of Hydrogen peroxide (20g/100 ml) = 10.63 ml.
To prepare 250 ml 0.25 M hydrogen peroxide, 10.63 ml of 20g/100 ml hydrogen peroxide has been taken and made up the volume to 250 ml.
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Calculate the internal energy of a system (in kiloJoules) that absorbs 14.73 kJ while being compressed with a pressure of 1.54 atm from 5.72 L to 1.0 L. Answer to one decimal space.
The internal energy of a system : 21.9 kJ
Further explanationThe laws of thermodynamics 1 state that energy can be changed but cannot be destroyed or created
The equation is:
ΔU=Q+W
Energy owned by the system is expressed as internal energy (U)
The sign rules for heat and work are set as follows:
• The system receives heat, Q +
• The system releases heat, Q -
• The system does work, W -
• the system accepts work, W +
The system absorbs 14.73 kJ⇒Q=+14.kJ
The system compressed⇒work done on the gas⇒W=+
W=-PΔV
[tex]\tt W=-1.54(1-5.720)\\\\W=7.2688[/tex]
[tex]\tt internal~energy(\Delta U)=Q+W\\\\\Delta U=14.73+7.2688\\\\\Delta U=21.9[/tex]
state the difference between spermatozoon and spermatogonium
Answer:
spermatozoon:A spermatozoon is a motile sperm cell or moving from of the haploid cell that is the male gamete.
spermatogonium : A cell produced at an early stage in the formation of spermatozoa, formed in the wall of a seminiferous tuble and giving rise by mitosis to spermatocytes.
Ammonia's unusually high melting point is the result of:__________
a. dipole-dipole forces.
b. London dispersion forces.
c. hydrogen bonding.
d. covalent bonding.
e. ionic bonding.
Answer:
c. hydrogen bonding.
Explanation:
Hydrogen bonding occurs when hydrogen is covalently bonded to a highly electronegative atom such as oxygen, flourine, nitrogen etc.
Hydrogen bonds are quite strong and are known to lead to elevated boiling points. As a result of hydrogen bonding, ammonia is known to have a high melting and boiling point compared to its relative molecular mass.
a human skull is ?????
Answer:
part of the skeleton that supports the structure of face and forms a cavity from bone.
Hope it help u.
Explanation:
hope it is helpful to you
What is the IUPAC name of this compound? ________ CH3-CHCl-CH2-CH2-Cl
Answer:
The prefixes are fluoro-, chloro-, bromo-, and iodo-. Thus CH 3CH 2Cl has the common name ethyl chloride and the IUPAC name chloroethane. Alkyl halides with simple alkyl groups (one to four carbon atoms) are often called by common names.05/06/2019
The IUPAC name of this compound is 2,3- dichlorobutane.
What is compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Which of these is NOT evidence that a chemical change has taken place?
temperature rising when 2 substances are mixed
gas production
color change
melting
Which relation is correct
E ᾳ ѵ
ѵ = c / λ
both are correct
none
Answer:
geruow0irghvn3p0unhie0ghik
Explanation:
What would the molecular formula be if potassium and chlorine reacted to form a neutral compound?
compound is formed when potassium reacts with chlorine, which forms ions with a negative charge. The formula of this compound would therefore be KCl.
The molecular formula if potassium and chlorine reacted to form a neutral compound will be KCI.
What happens to potassium if it reacts to chlorine?Potassium metal, K, will burn in the presence of chlorine gas,[tex]Cl_{2}[/tex], to form potassium chloride, KCl, an ionic compound.The chemical equation of this is [tex]2K_{aq}[/tex] + [tex]Cl_{2}[/tex]g→[tex]2KCL_{s}[/tex]We can also picture this reaction as being a redox reaction.When potassium metal is oxidized by chlorine gas to potassium cations, chlorine gas will be reduced to chlorine anions.The potassium cations and the chlorine anions will be combined to produce potassium chloride.To learn about potassium and chlorine reactions, refer to: https://brainly.com/question/20690183
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Now consider a sample of the gas at 33 deg C, 744 mm Hg, and 450 mL. If the pressure is decreased to 725 mm Hg and the temperature raised to 66C. What is the new volume of the gas? New volume =
Answer:
V₂ = 511.59mL
Explanation:
Given data:
Initial volume = 450 mL
Initial pressure = 744 mmHg
Initial temperature = 33°C (33 +273 = 306 K)
Final temperature = 66°C (66+273 = 339 K)
Final pressure = 725 mmHg
Final volume =?
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 744 mmHg × 450 mL × 339 K / 306 K ×725 mmHg
V₂ = 113497200 mmHg .mL. K / 221850 K.mmHg
V₂ = 511.59mL
A solution of cough syrup contains 5.00% active ingredient by volume. If the total volume of the bottle is 80.0 mL , how many milliliters of active ingredient are in the bottle?
Answer:
someone is in my mind and it is telling me 5.55m
Explanation:
Answer:
4 mL
Explanation:
4mL is 5% of 80mL. Therefore my answer is right.
A sample of Br2 gas has a volume of 29.0L and a pressure of 1.50 atm. If the initial temperature of the gas is 23 °C, what volume, in liters, will the gas occupy at 3.50 atm and 271 °C?
Answer:
V₂ = 22.84 L
Explanation:
Given data:
Initial volume = 20.0 L
Initial pressure = 1.50 atm
Initial temperature = 23 °C (23 +273 = 296 K)
Final temperature = 271°C (271+273 = 544 K)
Final pressure = 3.50 atm
Final volume = ?
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 1.50 atm × 29.0L ×544 K / 296 K × 3.50 atm
V₂ = 23664 atm .L. K / 1036 atm.K
V₂ = 22.84 L
how to do question no 17
Explanation:
even I don't know this answer
but maybe you can solve it by putting the formula
How many centimeters are in .479 kilometers
Answer:
47900 cm
General Formulas and Concepts:
Chemistry
Base 10 Decimal SystemUsing Dimensional AnalysisExplanation:
Step 1: Define
0.479 km
Step 2: Identify Conversions
1 km = 1000 m
1 m = 100 cm
Step 3: Convert
[tex]0.479 \ km(\frac{1000 \ m}{1 \ km} )(\frac{100 \ cm}{1 \ m} )[/tex] = 47900. cm
Step 4: Check
We are given 3 sig figs. Follow sig fig rules.
47900. cm ≈ 47900 cm
A carbocation is an example of a(an) ____. Does a carbocation accept a pair of electrons, or does it donate a pair of electrons?
A. Electrophile. The carbocation accepts a pair of electrons.
B. Nucleophile. The carbocation accepts a pair of electrons.
C. Electrophile. The carbocation donates a pair of electrons.
D. Nucleophile. The carbocation donates a pair of electrons.
Answer:
Option A. The carbocation accepts a pair of electrons.
Explanation:
A carbocation is defined as a positively charged carbon, which is bound to 3 substituents. Since it has no electrons nonbonding, it only has six electrons in its valence shell. With only six electrons in its valence shell, a carbocation is a powerful electrophile (and Lewis acid) and can react with any nucleophile that is found.
Carbocations are proposed as intermediates in many organic reactions. They also work like free radicals, which are electron-deficient species.
Same as free radicals, the carbocations are stabilized by alkyl substituents.
Pre-Lab Questions
Which of the following are considered matter?
electricity
fire
air
water
Answer:
Fire, Air, Water.
Explanation:
Matter is anything that has mass and occupies space. However, not all form of matter are visible. Air is an example of invisible matter.
Note, electricity does not have mass or does not occupy space. Therefore, electricity is not a matter.
Answer:
Fire, Air, Water
Explanation:
Electricity is the of charged particles conducting medium. However, it is the electrons that are matter, not their movement.
Matter is anything that has mass and occupies space. The flame itself is a mixture of gases and so is matter. The light and heat produced are energy not matter.
Like solids and liquids, air is matter. It has a weight and it takes up space.
Water is a liquid and liquids are one of the four fundamental states of matter.
1. Is it possible to distinguish DNA and RNA structures by using Bial’s Test? Explain.
2. What are the functions of orcinol and FeCl3 in Bial’s Test.
Answer:
yes and thats all i know
Explanation:
28. Element X is powerful enough to reduce sodium ions to sodium metal. Barium is a strong enough reducing agent to reduce X +to X. What is the identity of element X? _____________
Answer:
hope it's correct.
Explanation:
element is nickel.
You have a bottle of 18 M H2SO4 in your chemical storage closet. You need to make 2000 mL of a 0.2 M solution. How much of the 18 M sulfuric acid should you need to make this solution (in mL)?
Answer:
20 ml
Explanation:
A person aims for a target with a wooden bow and arrow. The image shows the path of the
arrow to the target.
bow and arrow
target
Answer:
What’s the answer
Explanation:
I neeeddsdd
Which of the following statements correctly describes the function of cell parts?
A. The cell membrane determines which type of cell will develop.
B. The nucleus contains all the nutrients that the cell needs.
C. The mitochondria are the power plants of the cell.
D. The genes contain hemoglobin.
The statements correctly describes the function of cell parts is the mitochondria are the power plants of the cell. Therefore, option C is correct.
What do you mean by the mitochondria ?The cytoplasm of a cell contains tiny structures (fluid that surrounds the cell nucleus). The majority of a cell's energy is produced by mitochondria, which also have unique genetic material distinct from that present in the nucleus.
Oxidative phosphorylation, which produces ATP using the energy generated during the oxidation of the food we ingest, is the traditional function of mitochondria.
For the majority of biochemical and physiological activities, including growth, mobility, and equilibrium, ATP is used as the main energy source in turn.
Thus, option C is correct.
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