Answer:
[NH₄NO₃] at D → 0.279 M
Explanation:
This exercise involves a series of dilutions one after the other.
First of all, we calcualte ammonium nitrate's concentration at A.
15.71 g . 1 mol/ 80 g = 0.196 mol / 0.150 mL = 1.31 M
At B → 1.31 M . 20 mL/ 75 mL = 0.349 M
At C → 0.349 M . 15 mL / 25 mL = 0.209 M
[NH₄NO₃] at B = 0.349 M
[NH₄NO₃] at C = 0.209 M
So let's calculate the new moles
In 1 mL of B we have 0.349 mmoles
In 10 mL of B we have 3.49 mmoles
In 1 mL of C we have 0.209 mmoles
In 10 mL of C we have 2.09 mmoles
Volume of D = 10 ml + 10ml = 20 mL
Total mmmoles = 3.49 mmoles + 2.09 mmoles = 5.58 mmoles
[NH₄NO₃] at D = 5.58 mmoles / 20mL → 0.279 M
On June 21st which location below will experience the longest amount of daylight?
1. Equator
2. North pole
3. Tropic of Capricorn
Answer:
2. North pole
Which reservoir is found underground in the cracks and spaces in the soil, sand, and rock?
Glaciers
Ground water
Polar ice caps
Rivers
Answer:
Ground water
Explanation:
The ground water reservoir is found underground in cracks and spaces in the soil, sand and rock.
Ground water is a very important portion of the water cycle where water is stored in an aquifer.
Aquifers are porous and permeable formations that stores ground water within them.
In this manner, ground water system is recharged by infiltration of water from the surface. Water percolates and collects inside an aquifer in this manner.
Answer:
Ground Water
Explanation:
Consider the Bohr Model of Phosphorus below. Which statement is FALSE?
(A) The electrostatic potential energy of ALL electrons is negative.
(B) The electrons with the least potential energy are closest to the nucleus.
(C) Energy is released when the electron is ejected from the atom.
(D) When an electron is infinitely far from the nucleus, the electrostatic potential energy is O.
Answer:
(C) Energy is released when the electron is ejected from the atom.
Explanation:
In the Bohr model of the atom, electrons are arranged in energy levels. The electrons in the lowest energy levels are nearest to the nucleus. An electron may move from a lower to a higher energy level by absorbing energy that is equal to the difference between the energies of the higher and lower energy level.
The potential energy of all electrons inside the atom have negative values and an electron which is infinitely far from the nucleus has an electrostatic potential energy of zero.
Energy is absorbed when an electron is removed from the atom (ionization). Hence the process is highly endothermic. Therefore it is false to say that "Energy is released when the electron is ejected from the atom."
strength, sickness, Stretchiness, and color are all different
1:Traits
2:Futures
3:None of the above
Answer:
1) Traits
Explanation:
Strength, sickness, Stretchiness, and color are all different because they result in a different body part and there all traits of the body
A mixture of 2 g of H2 gas (MM= 2g/mol) and 16 g of Ne gas (MM= 4g/mol) were occupied in 2 L balloon
at 30'C. What is the total pressure
inside the balloon?
The total pressure inside the balloon : 62.1 atm
Further explanationGiven
2 g of H2 gas (MM= 2g/mol)
16 g of Ne gas (MM= 4g/mol)
2 L balloon at 30'C
Required
The total pressure
Solution
mol H2 :
= mass : MM
= 2 : 2
= 1
mol Ne :
= 16 : 4
= 4
Total mol of gas = 5
T = 30+273 = 303 K
Ideal gas law :
P = nRT/V
P = 5 moles x 0.082 L.atm/mol.K x 303 K / 2 L
P = 62.1 atm
how many grams is 26.17 L Xe at STP
Answer:
Mass = 157.56 g
Explanation:
Given data:
Mass of Xe in gram = ?
Volume = 26.17 L
Temperature = standard = 273.15 K
Pressure = standard = 1 atm
Solution:
we will calculate the number of moles first.
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
1 atm ×26.17 L = n×0.0821 atm.L/ mol.K × 273.15 K
26.17 atm.L = n× 22.43 atm.L/ mol
n = 26.17 atm.L / 22.43 atm.L/ mol
n = 1.2 mol
Mass of Xe:
Mass = number of moles × molar mass
Mass = 1.2 mol × 131.3 g/mol
Mass = 157.56 g
Which element is an alkali metal?
A.
Sodium
B.
Calcium
C.
Hydrogen
D.
Zinc
Please help me answer this question
Drag the tiles to the correct boxes to complete the pairs.
Match the natural resources to their uses.
water
forests
wetlands
parks
paper
preserving aesthetic value
irrigation
trapping sediments
Answer:
water - irrigation
forests - paper
wetlands - trapping sediments
parks - preserving aesthetic value
Explanation:
One important use of water is for the irrigation of farmlands. Irrigation makes it possible for farming activities to continue all year round.
The papers yield pulp which is used to produce paper. This implies that paper is important product obtained from the forest.
The wetlands trap sediments and retain particulates from both onsite and offsite sources(blue earth county).
A park serves to preserve aesthetic value. This is a primary importance of the parks.
A chemist measures the amount of chlorine gas produced during an experiment. He finds that 98.2 of chlorine gas is produced. Calculate the number of moles of chlorine gas produced.
Answer:
[tex]1.385\ \text{moles}[/tex]
Explanation:
[tex]m[/tex] = Mass of chlorine gas produced = [tex]98.2\ \text{g}[/tex]
[tex]M[/tex] = Molar mass of chlorine gas [tex]Cl_2[/tex] = [tex]70.9\ \text{g/mol}[/tex]
Number of moles is given by
[tex]n=\dfrac{m}{M}[/tex]
[tex]\Rightarrow n=\dfrac{98.2}{70.9}[/tex]
[tex]\Rightarrow n=1.385\ \text{moles}[/tex]
Number of moles of chlorine gas produced is [tex]1.385\ \text{moles}[/tex].
Which of the following is not a good safety practice in the kitchen?
A
keep cleaning agents in a safe place away from food supplies
B
keep household cleaners and other hazardous chemicals in their original container
C
mix household cleaners to get a stronger cleaning product
D
keep the phone number for the poison control hotline next to the phone
Answer:
C. Mix household cleaners to get a stronger cleaning product
Explanation:
dont ever try that
C. Mix household cleaners to get a stronger product.
This is not safe because mixing chemicals may cause a toxic gas to form. This gas is toxic to people and can cause health issues.
I'm really sorry it took so long the school Wifi cut off while i was writing it lol
Xavier used a chart to list the roles of two different molecules in protein production.
Which headings best complete the chart?
Y: DNA
Z: tRNA
Y: tRNA
Z: DNA
Y: mRNA
Z: tRNA
Y: tRNA
Z: mRNA
Answer:
Y: tRNA
Z: DNA
Explanation:
This question involves two different nucleic acid molecules that are involved in protein production. Xavier used a chart to highlight the functions these nucleic acids perform during protein synthesis.
- Transfer RNA known as tRNA is a type of RNA molecule found in the ribosomes. It functions to read the mRNA codon and carry corresponding amino acid to the ribosomes for linking with one another. Based on this, "Y" on the chart is a tRNA molecule.
- Deoxyribonucleic acid, also known as DNA, is a molecule found in the NUCLEUS whose function is to store the genetic information in the cell. DNA carries the information needed for the synthesis of protein. Based on this, Z is a DNA molecule.
Answer:
The guy above is right! I got 100 on my test :]
An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.81 amu. What is the percent abundance of ¹²²X?
Answer:
40.5% is abundance of X-122
Explanation:
we know there are two naturally occurring isotopes of X, X-120 and X-122.
First of all we will set the fraction for both isotopes
X for the isotopes having mass 122
1-x for isotopes having mass 12 0
The average atomic mass of X is 120.81 amu
we will use the following equation,
122x + 120 (1-x) = 120.81
122x + 120 - 120x = 120.81
122x- 120x = 120.81 -120
2x = 0.81
x= 0.81/2
x= 0.405
0.405 × 100 = 40.5%
40.5% is abundance of X-122 because we solve the fraction x.
now we will calculate the abundance of X-120.
(1-x)
1 - 0.405 = 0.595
0.595 × 100 = 59.5 %
59.5 % for X-120.
Classify each of the following as a Strong acid (sa) or a Weak acid (wa) and indicate how each should be written in aqueous solution. Classify ... In solution this acid should be written as: fill in the blank 1 1. nitric acid fill in the blank 3 2. perchloric acid fill in the blank 5 3. hydrofluoric acid
Answer:
1. nitric acid: sa
2. perchloric acid: sa
3. hydrofluoric acid: wa
Explanation:
A strong acid (sa) is the one that is completely dissociated into ions in water. Conversely, a weak acid (wa) is not completely dissociated in water.
From the options, the strong acids are:
1. nitric acid (HNO₃). It dissociates completely into ions when is dissolved in water, as follows:
HNO₃ → H⁺ + NO₃⁻
2. perchloric acid (HClO₄). It is completely dissociated in water as follows:
HClO₄ → H⁺ + ClO₄⁻
The weak acid is hydrofluoric acid (HF). In water, only a small proportion is dissociated into ions. The proportion of ions formed is given by the equilibrium constant Ka. The dissociation is written by using double arrows:
HF ⇄ H⁺ + F⁻
What is the source of thermal energy for Earth's mantle?
A Earth's core
B. global warming
C. mantle downwelling
D. radiation from the sun
Answer:
D. Radiation from the sun
Explanation:
The main source of thermal energy for the earth is Sun. The sun is major source which provide heat energy and light energy to the earth. The sun converts almost 4 million tons of energy into electromagnetic radiations which is a source of thermal energy for Earth's Mantle.
which of the following is required for a reaction to occur?
a. energy
b. collisions
c. activation energy
d. all of the above
A sample of crude oil contains 3.09 mM naphthalene, 10.0 mM methylnaphthalene, 23.2 mM dimethylnaphthalene, and 14.4 mM trimethylnaphthalene. What is the total number of moles of all naphthalene compounds combined in 100.0 mL of the oil
Answer: 0.00507 moles
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml
1. moles of napthalene = [tex]\frac{3.09\times 0.001\times 100.0}{100}=0.000309moles[/tex]
2. moles of methyl napthalene = [tex]\frac{10.0\times 0.001\times 100.0}{1000}=0.001mole[/tex]
3. moles of dimethyl napthalene = [tex]\frac{23.2\times 0.001\times 100.0}{1000}=0.00232moles[/tex]
4. moles of trimethyl napthalene = [tex]\frac{14.4\times 0.001\times 100.0}{1000}=0.00144moles[/tex]
Thus total moles of all naphthalene compounds combined is (0.000309+0.001+0.00232+0.00144) = 0.00507.
HELP PLEASE
Which of these is measured in meter per second per second?
•speed
•velocity
•acceleration
•displacement
IM NOT SURE IF MY ANSWERS RIGHT SO IM NOT POSITIVE SORRY
According to VSEPR theory, if there are three electron domains in the valence shell of an atom, they will be arranged in a(n) __________ geometry.A. linearB. trigonal planarC. octahedralD. trigonal bipyramidalE. tetrahedral
Answer: B. trigonal planar
Explanation:
Valence Shell Electron Pair Repulsion Theory (VSEPR) is a model to predict the geometry of the atoms making up a molecule where atoms are arranged such that the forces of repulsion are minimum.
If a central atom is bound to three electron domains ,the number of electron pairs is 3, that means the hybridization will be [tex]sp^2[/tex] and the electronic geometry of the molecule will be trigonal planar as the electron pairs will repel each other and attain a position which is most stable.
Example: [tex]BCl_3[/tex] with 3 electron domains has trigonal planar geometry.
What is the short name used to refer to the elements that make up livings?. Single choice.
A. LIVE
B. CHNOPS
C. PBNJ
Answer:
B
Explanation:
Answer:
B. CHNOPS
Explanation:
Carbon Dioxide
Hydrogen
Nitrogen
Oxygen
Phosphorus
Sulfur
Calculate the number of vacancies in gold per cubic centimeter at 1000 K, where the density and atomic weight for gold at are 18.63 g/cm3 and 196.9 g/mol, respectively, at 1000 K. The energy for vacancy formation in gold is 0.98 eV / atom. (Please express scientific notation using E to indicate the exponent - for example, 2.5E3
Answer:
autom is 18.63 g
Explanation:
there
If you start with 8.95 g of crude sulfanilamide and recrystallize it from ethanol to recover 7.20 g of pure sulfanilamide, what is the percent recovery
Answer:
[tex]\% rec=80.4\%[/tex]
Explanation:
Hello!
In this case, since the percent recovery for this crystallization operation is computed as shown below:
[tex]\% rec=\frac{m_{recovered}}{m_{initial}} *100\%[/tex]
Thus, by plugging in the initial 8.95 g and the recovered 7.20 g, we obtain:
[tex]\% rec=\frac{7.20g}{8.95g} *100\%\\\\\% rec=80.4\%[/tex]
Best regards!
Zinc chloride is soluble.
Give the name of a soluble carbonate.
Give the name and formula of the precipitate formed when zinc chloride reacts with the
carbonate in a.
4 a Give the names of two solutions that would react together to form a precipitate of lead
chloride.
b Give the name and formula of the soluble product of this reaction.
Write the word equation for this reaction.
5 Copy and balance the following equations and add state symbols. Then write a word equation for
each.
a NaOH + CuCl2-NaCl + Cu(OH)2
b Ca(NO3)2 + Na2CO3 - CaCO3 + NaNO3
(NH4)2SO4 + Pb(NO3)
2NH4NO3 + PbSO4
с
Why must energy be absorbed to change a liquid to a gas?
Answer: Heat energy is absorbed to vaporize a liquid because molecules which are held together by intermolecular forces in the liquid are separated as the gas is formed
Explanation:whatever that means^ I looked it up
A student dissolves of styrene in of a solvent with a density of . The student notices that the volume of the solvent does not change when the styrene dissolves in it. Calculate the molarity and molality of the student's solution. Be sure each of your answer entries has the correct number of significant digits.
Answer:
0.576M and 0.655m
Explanation:
...Dissolves 15.0g of styrene (C₈H₈) in 250.mL of a solvent with a density of 0.88g/mL...
Molarity is defined as moles of solute (Styrene in this case) per liter of solution whereas molality is the moles of solute per kg of solvent. Thus, we need to find the moles of styrene, the volume in liters of the solution and the mass in kg of the solvent as follows:
Moles styrene:
Molar mass C₈H₈:
8C = 12.01g/mol*8 = 96.08g/mol
8H = 1.005g/mol* 8 = 8.04g/mol
96.08g/mol + 8.04g/mol = 104.12g/mol
Moles of 15.0g of styrene are:
15.0g * (1mol / 104.12g) = 0.144 moles of styrene
Liters solution:
250mL * (1L / 1000mL) = 0.250L
kg solvent:
250mL * (0.88g/mL) * (1kg / 1000g) = 0.220kg
Molarity is:
0.144 moles / 0.250L =
0.576MMolality is:
0.144 moles / 0.220kg =
0.655mScientists describe the motion of an object in relation to which of the following? A)Gravitational pull
B)[Force
C)Another object
D)Its mass
Answer:
A) Gravitational Pull
Explanation:
Objects on Earth are pulled toward the center of Earth. The force of gravity, like all other forces, can cause changes in the speed of objects.
Answer:
c
Explanation:
The arrangement in which the X substituents are at maximum separation is called the anti conformation. What is the dihedral angle between the X substituents for the anti conformation
Answer:
The dihedral angle between the X substituents for the anti conformation is 180°
Explanation:
Note: I think this question is not complete. Still, it can be answered. But for your concept and understanding, I am completing this question and then I will try to solve this question for you.
Other part of this question is about Gauche conformations and angle between the x substituents.
So, I will be drawing and answering both.
Answer to the original question: 180°
So, the dihedral angle between the X substituents for the anti conformation is 180°
Answer to the Gauche Conformation: 60°
Here, in this question we are discussing about the possible different staggered conformations of CH2XCH2X
You can see the angles between the X substitutes in anti conformations and Gauche Conformations for yourself in the attachment below.
Furthermore, this CH2XCH2X has 3 possible different staggered conformations. Out of which, one is anti conformation and other two are Gauche conformations.
Please refer to the attachment to see the conformations. Check the angles between X-X. In anti conformation, angle between X-X is 180° and energy is lower, because of the less interaction between H and X. However, in Gauche conformation, angle between X-X is 60° and energy is higher, because of the more interactions between H and X than anti conformation.
Why does a mixture of hydrogen and oxygen in a balloon not spontaneously explode at room temperature
Answer:
Because the molecules of the mixture would be compact or bond together at room temperature. In this case, both gases will condense to form water (or ice, if the room temperature is prolonged) and such droplets of water will not cause a balloon to spontaneously explode at room temperature.
Explanation:
A mixture of hydrogen and oxygen will form water. Recall that the chemical formula for water is H₂O, where H represents Hydrogen and O represents Oxygen.
A balloon is a light (not thick) solid substance with a thin membrane when blown or filled with some elements or gases.
Room Temperature means cool or cold temperature. You already know that generally at room temperature, the molecules of any substance will stick together or will become less mobile (less spontaneous).
In this case, hydrogen gas and oxygen gas will go through a process called condensation - to form water - and then through the process called freezing - to form ice.
At room temperature, the gases will first change state (state of matter) from gaseous to liquid and then from liquid to solid.
This is why the balloon will NOT spontaneously explode.
In the nitrogen cycle, plants use nitrogen compounds to produce *
Answer: Once nitrogen is converted into compounds like ammonium and nitrate, these can be taken up from soils by plants and then the nitrogen can be used to form macromolecules like proteins and nucleic acids (DNA and RNA).
The answer is proteins
Number of moles in 9.04 x 1023 molecules of H2O?
Answer:
44x+7y
Explanation:
The number of molecules in one mole of water is 6.02 × 10²³. Therefore, the number of moles of carbon dioxide which contains 9.04 × 10²³ molecules is 1.50.
What is Avogadro number ?The number of atoms that constitutes one mole of a substance is called Avogadro number. It is equal to 6.02 × 10²³. Thus, one mole of every elements contains Avogadro number of atoms.
Similarly, one mole of a compound contains 6.02 × 10²³ number of molecules. Thus, one mole of carbon dioxide contains these much molecules.
Given the number of molecules of water = 9.04 × 10²³
Then, no.of moles = number of molecules/ Avogadro number.
no.of moles =9.04× 10²³ /6.022 × 10²³ = 0.68.
Therefore, the number of moles of H₂O that contains 9.04 × 10²³molecules is 1.50
Find more on Avogadro number:
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