The average atomic mass of nitrogen is 14.003 amu.
Nitrogen exists in the form of two isotopes 14N and 15N.
In case an element exists in more than one type of isotope, then its average atomic mass can be calculated using the following formula
Average Atomic Mass = (Percentage abundance of isotope 1) x (Mass of isotope 1) + (Percentage abundance of isotope 2) x (Mass of isotope 2)/100
We are given that
Mass of isotope 1 = 14 amu
%age abundance of isotope 1 = 99.632 %
Mass of isotope 2 = 15 amu
%age abundance of isotope 2 = 0.368 %
Putting the above values in the equation
Average Atomic Mass = (99.632) x 14 + (0.368) x 15/100
Average atomic mass = 14.003 amu
Hence, the average atomic mass of nitrogen is 14.003 amu.
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Answer: It is 14.007 did the test
Explanation:
Postsynaptic currents produced by ampa glutamate receptors are _______ than those produced by other ionotropic glutamate receptors.
Metals participate in two types of single-displacement reactions. A reactive metal can displace _____ gas either from water or from an aqueous acid. A _____ reactive metal can also displace the ion of a _____ reactive metal from solution.
A reactive metal can displace HYDROGEN gas either from water or from an aqueous acid.
A MORE reactive metal can also displace the ion of a LESS reactive metal from the solution.
A more reactive metal (one that forms positive ions more easily) can displace a less reactive metal from a compound. This is called a displacement reaction. Metal can only displace another metal from a compound if it is located above it in the reactivity series.
As a result, the more reactive metal enters the solution as a cation, whereas the less reactive metal's cations are converted to metal. So more reactive metals displace less reactive metals from their salt solutions.
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For each carbon bond shown, how many electrons surround each carbon atom.
A) 2
B) 4
C) 6
D) 8
is granola a homogeneous or heterogeneous mixture??
Granola is a heterogeneous mixture.
Heterogeneous mixture is a mixture that does not resemble the uniform mixture and the mixture appears non-uniform.
Granola is a heterogeneous mixture in which Oats, nuts, honey, or other sweetener including brown sugar are commonly incorporated to make granola, that is then typically roasted until it is crunchy, toasted, and golden brown. Periodically, raisins will be added.
Since, different individual could be seen hence it is a heterogeneous mixture.
Hence, Granola is a heterogeneous mixture.
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PLEASE HELP ASAP!! GIVING BRAINLIEST!!
1. I believe the answer to the first one is K and K+ are the bigger atom.
2. So I believe Strontium looses 2 electrons
How many atoms does 2 SO₃
Answer:This formula has three types of atoms - nitrogen (N), hydrogen (H) and oxygen (O). There are a total of 4 atoms in one molecule of SO3.
What intermolecular force or forces govern the solubility of 9-fluorenone in diethyl ether?.
Dipole-induced dipole attraction intermolecular force governs the solubility of 9-fluorenone in diethyl ether.
A dipole-induced dipole attraction is a type of weak attraction as it results when a polar molecule induces a dipole either in an atom or in a non-polar molecule by disturbing the electron arrangement in the particular non-polar species.
Most organic molecules are polar since they have a dipole moment. On behalf of solvents, polarity refers to solvents having higher polarity, and non-polar solvents with lower polarity. Diethyl ether is located at the lower end of the polarity scale and is generally considered a type of 'non-polar' solvent. Therefore, diethyl ether has a small dipole.
As Diethyl ether has a very low polarity value, if any, it is clear that H-bonding is not possible. London dispersion forces are present in all either polar or non-polar molecules, so it is clear that they are present here too. Since it is slightly polar so it may be exhibiting weak dipole-dipole interactions.
Carbon-donated hydrogen bonding is a real thing but they are generally very very weak non-covalent interactions. . London Dispersion Force is present in every chemical system but is weak as well . There are many exceptions where these forces may be significant in the case of binding energies of several dispersion-dominated molecules.
Therefore, the solubility of 9-fluorenone in diethyl ether is governed by dipole-induced dipole attraction or London dispersion forces.
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in an insulated vessel, a quantity of hot water at temperature t1 is mixed with a different quantity of cold water at temperature t2 . after equilibrium is established, the vessel contains .
The correct option is (4) Water only.
After equilibrium is established, the vessel contains water only.
What is insulation?Insulation is a material that serves as a barrier between the interior of your home and the considerably variable outside temperature to decrease heat absorption or loss. Heat cannot be added or removed from the vessel since it is insulated; consequently, there is no heat exchange. If hot water and cold water are combined, the final water temperature in the equilibrium vessel will be moderate. Hot water generates the same amount of heat that cold water looses.
By limiting heat movement, insulation ensures optimal housing efficiency. Insulation is mostly used to keep the interior of your home at the proper temperature while consuming less energy.
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The complete question is:
"In an insulated vessel, a quantity of hot water at temperature T1 is mixed with a different quantity of cold water at temperature T2. After equilibrium is established, the vessel contains __________.
1. steam only
2. ice only
3. water and ice
4. water only"
Explain or show how you could calculate the mass of an object if you know its volume and density.
Answer:
yea I'm also looking for this question to .
Your lab supervisor tells you to heat a chemical until it is 165 degrees* F . What should your thermometer (which measures in C) read when it reaches the correct emperature ?
Answer:
73.8888 repeated
Explanation:
Which of the following is NOT part of Dalton's Atomic Theory?
1. Atoms are composed of tiny subatomic particles.
2. Atoms that combine do so in simple, whole-number ratios.
3. All elements are composed of atoms.
4. Atoms of the same element are identical.
Answer: The statement that theatoms are made up of protons, neutrons, and electrons is not a part of Dalton's atomic theory. Therefore, option c is correct.
Explanation:
What have scientists learned about the cuttlefish through observation?
Answer:
Explanation: Cuttlefish are often called the chameleons of the ocean; this is due to their striking ability to change color for a variety of reasons. ... Cuttlefish have been recognized as changing color to camouflage themselves from, or to warn off predators, and to interact with other cuttlefish.
ph is defined as the negative log10 of the hydrogen ion activity, ah , although general chemistry texts commonly express it in terms of the hydronium ion concentration. thus, ph
pH is defined as the negative log10 of the hydrogen ion activity, although general chemistry texts commonly express it in terms of the hydronium ion the pH is calculated as 3.23.
What is pH?In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. Historically, pH stood for "potential of hydrogen."
The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.
It is provided that,
{H3O+} = 5.79 X 10^-4M
We know that pH is basically the negative log10 of the hydrogen ion.
this means,
Thus, pH = -log10[H3O+]
Then putting the value of [H3O+]
pH = -log10 (5.39 x 10^-4)
pH = 3.23
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Complete question
PH is defined as the negative log10 of the hydrogen ion activity, aH+, although general chemistry texts commonly express it in terms of the hydronium ion concentration. Thus, pH = −log10 [H3O+], where [H3O+] represents the concentration of H3O+ in units of moles per liter (M). Calculate the pH or [H3O+], as required, for the following solutions. {H3O+} = 5.79 X 10^-4M
the freezing point of a cyclohexane sample is 6.20 °c. a solution is prepared by dissolving 0.4660 g of anunknown solute in 36.0 g cyclohexane. the freezing point of the resulting solution is 4.11 °c.
The answer of this question is 123.87 g
Here we have to find the molar mass of unknown solvent
Given,
freezing point of cyclohexane sample =6.20°c
freezing point of resulting solution =4.11°c
Delta Temperature(Δt) = kf × molality for finding molality
Moles = grams / molar mass
Molality = moles / kg solvent
In cyclohexane, the mass of mixed solute = 0.4 × 609
Solute mixed in cyclohexane and mixed in cycloheptene= 0.4^2 × 1000 / 36 π
Del Temperature (Δt)= kf × molality
= 2.0920 × 0.4 × 1004 / 36 × 2.09
M = 9320 / 73.29
= 123.87
Molar mass of an unknown solvent = 123.87 grams
so, the answer of this problem is 123.87 g
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calculate the molar concentration of a 3.0% mass percent concentration of h2o2. you can assume the density of the solution is 1.00 g/ml. (hint: start with 1.00 kg of solution)
The molar concentration of 3.0% mass percent concentration of H₂O₂ is 0.88 MOL/L
Explanation:
From the given problem:
Concentration of H₂O₂ = 3.0%
Volume = 1.00 ml
Density of solution = 1.00 g/ml
Here it is given that, In 3.0% H₂O₂ , the solution contain 30g H₂O₂ per 1000g of solution.
To find the molecular weight of H₂O₂, we have to do this calculation to get the molecular weight of H₂O₂= 2(mass of hydrogen) + 2(mass of oxygen) = 2×1 + 2×16
Since the molecular weight of H₂O₂ =34 g/MOL.
then 30g would be (Mass/ MOL. wt)
= (30g)/(34g/MOL.)
=0.88 MOL.
So the solution would be 0.88 MOL/L
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What is the atmosphere?
Answer:
The atmosphere is the layer of gases surrounding a planet or other celestial body.
Explanation:
Hope this helps:)
The particles of a gas inside a balloon are experiencing an increase in their average kinetic energy and the number of collisions with the wall of the balloon. What is the most likely outcome?
The slope of the graph
What units are appropriate for the slope?
The density of a gold sample is 18.88 is it pure gold?
20 is the slope of the given graph
The density of the pure gold is 19.3g/cc. here in this figure it is given that a graph plotted against mass vs volume. the slope is calculated by
y₂-y₁/x₂-x₁ = 0.4-0.1/0.02-0.005
=20
density of the sample is so from the above given data the calculated average density we get it 19.3 which is the pure golds density.
Gold nuggets are naturally occurring pieces of gold in nature. Streams often concentrate nuggets and fine gold in placer gold. Nuggets are obtained from placer mining, but are also found in gold-bearing veins or deposits of weathered deposits.
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At the end of an enzymatic reaction, what will the concentrations of the substrate, product, and enzyme be relative to the start of the reaction?.
At the end of an enzymatic reaction there remains a product and the unaltered enzyme.
What happens when the substrate concentration in an enzymatic reaction is increased?Concentration of Substrate: To a point, increasing the substrate concentration also increases the rate of reaction. Any increase in substrate will have no effect on the rate of reaction once all of the enzymes have bound, because the available enzymes will be saturated and working at their maximum rate.The products of the reaction are released from the active site and diffuse away after the reaction occurs." by OpenStax College, Biology, CC BY 3.0. We know that when an enzyme binds to its substrate, it lowers the activation energy of the reaction, allowing it to happen faster.One of the most important properties of enzymes is that the reactions they catalyse leave them essentially unchanged. After catalysing a reaction, an enzyme releases its products (substrates).This means that as the enzyme concentration decreases, so will the reaction rate. In most biological environments, the enzyme concentration is lower than the substrate concentration. The proportionality between enzyme concentration and enzyme activity is direct.To learn more about enzymatic reaction refer to
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the rate constant for the decomposition of acetaldehyde, ch3cho, to methane, ch4, and carbon monoxide, co, in the gas phase is 1.10 × 10−2 m −1 s−1 at 703.7 k and 4.90 x 10-2 m−1 s−1 at 865 k. determine the activation energy for this decomposition. give your answer in kilojoules per mole and use 3 sig figs in your answer.
The rate constant for the decomposition of acetaldehyde, CH₃CHO, to methane, CH₄, and carbon monoxide, CO, in the gas phase is 1.10 × 10² m⁻¹ s⁻¹ at 703.7 k and 4.90 x 10⁻² m⁻¹ s⁻¹ at 865 k.The activation energy for this decomposition in KJ/mole is 154.303
To determine the activation energy of a reaction (Ea) from two reaction rates (k₁ and k₂) at two different temperatures (T₁ and T₂).
we use the equation -
k₂ = Eₐ x ( 1 - 1 )
k₁ R T₁ T₂
Where,
R is the gas constant (8.3145 J/mol.K).
We have -
k₁= 1.10 x 10⁻² m⁻¹ s⁻¹
T₁= 703.7 K
k₂= 4.90 x 10⁻² m⁻¹ s⁻¹
T₂= 865 K
Putting the values in the equation -
4.90 x 10⁻² m⁻¹ s¹ = Ea x ( 1 - 1 )
1.10 x 10⁻² m⁻¹ s⁻¹ (8.3145 J/K.mol) 703.7 K 865 K
Ea = (4.90 x 10⁻² m⁻¹ s⁻¹) / ( 1 - 1 ) x (8.3145 J/K.mol)
1.10 x 10⁻² m⁻¹ s⁻¹ 703.7 K 851 K
Ea = 154303 J/mol
When divided by 1000,
Ea in KJ/mol = 154.303 KJ/mol
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Which object is a liquid, feels sticky, and is brown in color?(2 points)
Chocolate frosting
Coffee
Soil
Maple syrup
Answer:
Maple Syrup
Explanation:
Blue ink from two different pens appears to be the exact same color. Explain how
to determine whether the inks are identical.
A paper ink chromatogram can also be used to detect compounds by comparing them to already identified substances. If two substances create the same number of dots that match in color, they are most likely the same.
The spots travel up the page the same distance (have the same R f value). A paper chromatogram can also be used to detect compounds by comparing them to already identified substances. If two substances create the same number of dots that match in color, they are most likely the same. Thus, ink is a mixture since it is composed of two substances: water (solute) and dye (solvent).
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5. Determine how the Sun can continue to heat the atmosphere at night. SC.6.E.7.5
Some terminator atmosphere streams over the horizon, and there may be a trace of warmth from sunlight reflected off the lunar surface.
What is the atmosphere?
The layer of gases held by Earth's gravity that surrounds the planet and constitutes its planetary atmosphere is known as the atmosphere or air. The Earth's atmosphere supports life by producing pressure on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and decreasing temperature extremes between day and night.
Some terminator atmosphere streams over the horizon, and there may be a trace of warmth from sunlight reflected off the lunar surface. However, the sun does not, in general, warm the environment at night. As a result, the atmosphere tends to cool during the night, reaching its coldest point right before morning.
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One type of neon has 10 neutrons, while other types have 11 neutrons and 12 neutrons. which term best defines the different types of neon atoms in nature?
One type of neon has 10 neutrons, while other types have 11 neutrons and 12 neutrons. The term best defines the different types of neon atoms in nature is known as Isotopes.
Isotopes are atoms of the similar element that have indifferent numbers of neutrons but the equal number of proton and electrons.
The different in the neutrons results the same element with different masses.
Neon is a chemical element. Its symbol is denoted by Ne.
It is called as Nobel gas and the most stable element.
If talking about the properties it is odorless , uncolored, monoatomic, chemically inactive.
Also called as inert gas.
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Answer: isotopes
Explanation:
i took the test
Mrs. bauer wanted to investigate whether the amount of time students studied for the test would affect their grade on final. what is the independent variable in the experiment?
Answer: amt of time students studied
Explanation:
Calculate the mass (mg) of a cube of palladium of edge length 0.055 mm given that the density of palladium
is 12.02 g/cm³
The mass (in mg) of the cube of palladium of edge length 0.055 mm is 0.002 mg
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
With the above formula, we can obtain the mass of the palladium. Details below
How to determine the mass of the silverEdge length (L) = 0.055 mm = 0.055 / 10 = 0.0055 cmDensity of palladium = 12.02 g/cm³Volume of palladium = L³ = 0.0055³ = 1.66×10⁻⁷ cm³Mass of palladium =?Density = mass / volume
Cross multiply
Mass = Density × Volume
Mass of palladium = 12.02 × 1.66×10⁻⁷
Mass of palladium = 2.0×10⁻⁶ g
Multiply by 1000 to express in milligram (mg)
Mass of palladium = 2.0×10⁻⁶ × 1000
Mass of palladium = 0.002 mg
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What is the chemical formula for sugar?
Answer:
C12H22O11
Explanation:
Sodium phosphate reacts with sulfuric acid to form sodium sulfate and phosphoric acid. What is the stoichiometric coefficient for sulfuric acid when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?.
When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.
In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.
The chemical equation for the given reaction is:
[tex]Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Put the necessary stoichiometric coefficient to balance each element.
Balancing Na:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Balancing P:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Balancing S:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Notice that H and O are already balanced.
Hence, the balanced chemical equation for the reaction is:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
where 3 is the stoichiometric coefficient of sulfuric acid, [tex]H_{2} SO_{4}[/tex].
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suppose 2 pints of a 19% alcohol solution is mixed with 8 pints of a 90% alcohol solution. what is the concentration of alcohol in the new 10-pint mixture
If we suppose 2 pints of a 19% alcohol solution is mixed with 8 pints of a 90% alcohol, then the amount of alcohol is calculated as 92.8%
What is molarity?A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration.
Molarity (M) is the amount of a substance that is present in a certain volume of solution.
Molarity is defined as the moles of a solute per liters of a solution which can further be formulated as:
M= Moles of the solute/ volume of solution.
Herein we have
0.19 (2 pints) + 0.90 (8 pints) = 9.28 pints
So, the concentration is:
9.28 pints / 10 pints × 100% = 92.8%.
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Compare and contrast a solution and a suspension
The difference between a solution and a suspension is in the particle sizes involved. A solution is a mixture of ions or molecules (very, very small). Solutions are transparent, meaning that you can see through them. A suspension has bigger particle sizes and so it may look cloudy or murky