Answer:
The estimated economic value of freshwater ecosystems to our economy is in the billions of dollars. Therefore, the correct answer is c) Billion of dollars.
10)
How many total atoms (N + H) are in one mole of ammonia (NH3) molecules?
A)
6.0x10^23
B)
1.2x10^24
C)
1.8x10^24
9
D)
2.4x10^24
Answer:
D
Explanation:
Took the test
Answer:
D
Explanation:
Got it right on my test
Consider the following reaction: 2N2O5(g) → 4NO2(g) + O2(g) Calculate the volume N2O5 that must decompose completely to produce 9.64 L nitrogen dioxide.
The volume of \(N_2O_5\) needed to produce 9.64 L of \(NO_2\) is 4.97 L, calculated using stoichiometry and the ideal gas equation.
The given chemical equation is \(2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)\) .The volume of \(N_2O_5\) that decomposes completely to form 9.64 L of \(NO_2\) is to be calculated. For this, we can use the concept of stoichiometry. Stoichiometry is a branch of chemistry that deals with the quantitative relationships between reactants and products in a balanced chemical equation.To calculate the volume of \(N_2O_5\) that is needed to produce 9.64 L of \(NO_2\), we will first determine the number of moles of NO2 produced in the reaction. For this, we can use the ideal gas equation, PV = nRT. Here, we have the volume of NO2 and we can assume the pressure and temperature to be constant. Thus, we have PV = nRT, where P = pressure, V = volume, n = number of moles, R = ideal gas constant, and T = temperature. Substituting the given values in the ideal gas equation, we get,n = PV/RT = (1 atm × 9.64 L)/(0.0821 L atm K-1 mol-1 × 300 K) = 0.404 molFrom the chemical equation, we see that 2 moles of \(N_2O_5\) give 4 moles of \(NO_2\). Thus, 0.404 mol of \(NO_2\) must have been produced from (0.404/2) = 0.202 mol of \(N_2O_5\). Using the ideal gas equation, we can also find the volume of 0.202 mol of \(N_2O_5\) at the given conditions. Thus, V = nRT/P = (0.202 mol × 0.0821 L atm K-1 mol-1 × 300 K)/1 atm = 4.97 L. Thus, the volume of \(N_2O_5\) that must decompose completely to produce 9.64 L nitrogen dioxide is 4.97 L.For more questions on stoichiometry
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In which of the following is the number of neutrons correctly represented?
A. F has 0 neutrons.
B. As has 42 neutrons.
C. Mg has 24 neutrons.
The number of neutrons correctly represented is B. As has 42 neutrons.
What is a Neutrons?Neutrons, as well as protons, ca be described as the subatomic particles that are present inside the nucleus of every atom and only in hydrogen, is where the nucleus contains only a single proton.
However the Neutrons have a neutral electric charge as well as and slightly more mass than positively charged protons.
It should be noted that Arsenic (As), has Atomic Number 33, Mass 74.922.
Mass number -Atomic number =Number of neutrons
And the Number of neutrons =74.922 - 33 = 41.9 =42
Therefore, option B is correct.
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Determine how many ml of water you need to remove, by evaporation, if you have a 500 ml of 10.20 M HNO3 dilute solution and you need to make it a 12 M HNO3 stock solution.
The total volume of water that would be removed will be 75 mL
Dilution equationUsing the dilution equation:
M1V1 = M2V2
In this case, M1 = 500 mL, V1 = 10.20 M, M2 = 12 M
Substitute:
V2 = 500 x 10.20/12
= 425 mL
The final volume in order to arrive at 12 M HNO3 would be 425 mL from the initial 500 mL. Thus, the total amount of water that will be removed by evaporation can be calculated as:
500 - 425 = 75 mL
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When 100 identical steel balls are placed on a
triple beam balance, their mass is determined to
be 1,450 grams. The mass of a single steel ball
would be closest to
Explanation:
thank you for the points
Rank in order of acidity (1= most acidic)
The rank order of acidity is para nitro phenol > meta nitro phenol > phenol > Para amino phenol.
What does acidity order mean?'The nitro group is a powerful electron withdrawing group. As a result, by removing electron density from the carboxylate ion, it increases the acidity of benzoic acid. This effect is strongest when the nitro group is in the ortho position (the effect is known as ortho effect).
The chemical structure of an acid can be used to predict its relative strength. An acid is generally stronger when the H-A bond is more polar. When the H-A bond is weaker and the conjugate base, A, is more stable, acidity increases.
Thus, The rank order of acidity is para nitro phenol > meta nitro phenol > phenol > Para amino phenol.
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Calculate the molarity of a solution prepared by diluting 60.02 mL of a 0.574 M potassium chloride solution to 150.00 mL.
The molarity of the solution prepared by diluting 60.02 mL of a 0.574 M potassium chloride solution to 150.00 mL is 0.229 M.
The initial molarity of the potassium chloride, M₁ = 0.574 M
The initial volume potassium chloride , V₁ = 60.02 mL
The final molarity potassium chloride, M₂ = ?
The final volume potassium chloride, V₂ = 150 mL
The expression is as follows :
M₁ V₁ = M₂ V₂
M₂ = M₁ V₁ / V₂
M₂ = ( 0.574 × 60.02 ) / 150
M₂ = 0.229 M
The molarity of the solution is 0.229 M with the volume of the 150 mL.
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A solution is made using 65.1 g of hexane (MM = 86.18 g/mol) and 60.0 g of octane (MM = 114.2 g/mol). What is the mole fraction of the hexane in the solution?
The mole fraction of the hexane in the solution is 0.59
Data obtained from the question Mass of hexane = 65.1 gMolar mass of hexane = 86.18 g/molMass of octane = 60 gMolar mass of octane = 114.2 g/molMole fraction of hexane =? Determination of mole of hexane Mass of hexane = 65.1 gMolar mass of hexane = 86.18 g/molMole of hexane =?Mole = mass / molar mass
Mole of hexane = 65.1 / 86.18
Mole of hexane = 0.755 mole
Determination of mole of octane Mass of octane = 60 gMolar mass of octane = 114.2 g/molMole of octane =?Mole = mass / molar mass
Mole of octane = 60 / 114.2
Mole of octane = 0.525 mole
How to determine the mole fraction of hexane Mole of hexane = 0.755 mole Mole of octane = 0.525 mole Total mole = 0.755 + 0.525 = 1.28Mole fraction of hexane =?Mole fraction = mole / total mole
Mole fraction of hexane = 0.755 / 1.28
Mole fraction of hexane = 0.59
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Part A
A solution of cough syrup contains 5.00% active ingredient by volume. If the total volume of the bottle is 68.0 mL, how many milliliters of ac
ingredient are in the bottle?
Express your answer with the appropriate units.
There are 3.4 milliliters of the active ingredient in the cough syrup bottle.
To calculate the volume of the active ingredient in the cough syrup bottle, we need to multiply the total volume of the bottle by the percentage of the active ingredient.
Given:
Total volume of the bottle = 68.0 mL
Percentage of active ingredient = 5.00%
First, we convert the percentage to a decimal by dividing it by 100:
Percentage of active ingredient = 5.00% = 5.00/100 = 0.05
Next, we calculate the volume of the active ingredient:Volume of active ingredient = Total volume of the bottle × Percentage of active ingredient
Volume of active ingredient = 68.0 mL × 0.05
Volume of active ingredient = 3.4 mL
Therefore, there are 3.4 milliliters of the active ingredient in the cough syrup bottle.
It's important to note that the calculation assumes a homogeneous distribution of the active ingredient throughout the solution.
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Which of the following carbocations is(are) likely to undergo a rearrangement?
A. only I
B. I and III
C. II and III
D. I, II, III
The cations that are more likely to undergo rearrangement are II and III Option C
Why does cations undergo rearrangement?
Cation rearrangement is a phenomena that causes cations, which are positively charged ions, to reorganize themselves under specific conditions. The term "cation rearrangement " describes the movement of ions inside a substance or solution that is caused by a variety of elements, including concentration gradients, electric fields, or chemical reactions.
Rearrangements influence the mobility and redistribution of cations inside substances or solutions, which can have a significant impact on the system's behavior and characteristics.
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Can sound move through solids, liquids and gasses? How do you know? (give an example).
Sound can move through solids, liquids, and gases. Sound is a mechanical wave that propagates through a medium by causing vibrations or oscillations of particles within that medium.
Solids: Sound can efficiently travel through solids due to the tightly packed arrangement of particles. An example is when tapping one end of a long metal rod and hearing the sound transmitted through the rod.
Liquids: Sound can also move through liquids. For instance, on making sounds near a swimming pool, one can hear the sound underwater.
Gases: Sound can propagate through gases as well. An example is when speaking and hearing in a room.
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what is (3.11*10^-5)-(4.21*10^-2)
Taking into account the scientific notation, the result of the subtraction is -4.20689×10⁻².
Scientific notationScientific notation is a quick way to represent a number using powers of base ten, where the numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.Subtraction in scientific notationWhen the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found. In this case, the highest exponent is -2.
Then all the values are expressed as a function of the base 10 exponent with the highest exponent. In this case: 3.11×10⁻⁵= 0.00311×10⁻²
Taking the quantities to the same exponent, all you have to do is subtract what was previously called the number "a". In this case:
0.00311×10⁻² - 4.21×10⁻²= (0.00311 - 4.21)×10⁻²= -4.20689×10⁻²
Finally, the result of the subtraction is -4.20689×10⁻².
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What would be the mass of 4.640 x 10²1
particles of Aluminum (Al)?
The mass of 4.640 x \(10^{2}\) L particles of Aluminium is 33.67 g
The total number of molecules present in 22.4 litres of an element is equal to Avagadro's Number.
The value of Avagadro's number = \(6.023*10^{23}\).
To calculate the mass of \(4.640*10^{2}\) litres of Al, we first need to find the number of molecules present in it, then find the product of the number of molecules present will the mass of one molecule of Al atom.
Mass of Al=27
Number of molecules in 22.4 litres of Al = \(6.023*10^{23}\)
Number of molecules in 1 litre of Al = \(\frac{6.023*10^{23}}{22.4}\)
Number of molecules in \(4.640*10^{2}\) litres of Al= \(\frac{{6.023*10^{23}*4.640*10^{2}}}{22.4}\)
=\(1.247*10^{21}\)
Mass of \(1.247*10^{21}\) molecules of Al:
= \(1.247*10^{21}*27\) g
=33.669 g
=33.67 g
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describe how sulphate of lead 2 sulphate ammonium chloride can be obtained from a mixture of three
Steps in separating this mixture include:
Dissolve the mixture in waterAdd a solution of sodium sulfateFilter the precipitate to separate the lead sulfateAdd a solution of ammonium chlorideFilter the precipitate in other to separate lead chloride from the solutionHow to separate sulphate of lead, ammonium chloride, and ammonium sulphate from a mixture of three?A method for extracting sulphate of lead, ammonium chloride and ammonium sulphate out of three different components involves dissolving them first in water before adding sodium sulfate which then leads to formation of solid particles - namely Precipitated Lead Sulfate (PbSO4).
The next step requires removing these particles by employing a filtration process before including Hydrochloric Acid (HCl) so as to derive Ammoniated Lead Chloride (NH4PbCl3).
Again use filtration process on this compound as well followed up with yet another addition step involving Hydrochloric Acid which results in creation of Ammoniated Salt NH4Cl crystals into solution - collect these small gemstones via filtration before undergoing drying procedure thus achieving final products.
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Each 5-ml teaspoon of Extra Strength Maalox Plus contains 450 mg of magnesium hydroxide and 500 mg of aluminum hydroxide. How many moles of hydronium ions H3O are neutralized by 1 teaspoon of antacid product?
Answer:
0.0347 moles of hydronium ions
Explanation:
The equation of the neutralization reaction between hydroxide and hydronium ions is given below:
H₃O+ (aq) + OH- (aq) ----> 2 H₂O (l)
From the equation above, 1 mole of hydroxide ions will neutralize one mole hydronium ions.
The moles of hydroxide ions present in 1 teaspoon or 5 mL of antacid product is calculated as follows:
Number of moles = mass / molar mass
Molar mass of Magnesium hydroxide, Mg(OH)₂ = 58 g/mol
Molar mass of aluminium hydroxide, Al(OH)₃ = 78 g/mol
Mass of magnesium hydroxide = 450 g = 0.45 g
Mass of aluminium hydroxide = 500 mg = 0.5 g
Moles of magnesium hydroxide = (0.45/58) moles
Moles of aluminium hydroxide = (0.5/78) moles
Equation of the ionization of magnesium hydroxide and aluminium hydroxide is given below:
Mg(OH)₂ (aq) ----> Mg²+ (aq) + 2 OH- (aq)
Al(OH)₃ (aq) ---> Al³+ (aq) + 3 OH- (aq)
Number of moles of hydroxide ions present in (0.45/58) moles of magnesium hydroxide = 2 × (0.45/58) moles = 0.0155 moles
Number of moles of hydroxide ions present in (0.5/78) moles of aluminium hydroxide = 3 × (0.5/78) moles = 0.0192 moles
Total moles of hydroxide ions = 0.0155 + 0.0192 = 0.0347 moles hydroxide ions
Therefore, 0.0347 moles of hydroxide ions will neutralize 0.0347 moles of hydronium ions.
Which daughter element is produced from the alpha decay of 213 over 85 At ?
A. 213 over 86 Rn
B.217 over 87 Fr
C. 213 over 84 Po
D. 209 over 83 Bi
Answer:
209
83 Bi
Explanation:
213 213 - 4 4
85 At = 85 - 2 Y + 2 He
what are nanofluids and how they work?
Answer:
What is nanofluids?
Nanofluids are engineered suspensions of nanometer-sized solid particles in a base fluid. Suspending small solid particles in the energy transmission fluids can improve their thermal conductivity and provides an effective and innovative way to enhance their heat transfer characteristics significantly.
How nanofluids work?
Nanofluid refers to the dispersion of metal or non-metal nano-powder into traditional heat exchange media such as water, alcohol, and oil to prepare a uniform, stable and high thermal conductivity. The traditional heat exchange medium has a low thermal conductivity and has been unable to meet the growing demand for industrial engineering heat exchange. The thermal conductivity of some metal or non-metal nanoparticles is often hundreds of times higher than that of heat-conducting media. For example, common silicon carbide nanoparticles have a thermal conductivity of 170-270 W/m•K. The researchers found that if the nanoparticles can be uniformly and stably dispersed in the heat transfer medium, the thermal conductivity of the nanoparticles will be greatly improved.
What is the molar mass
MgCrO4
The molar mass of MgCrO4 is approximately 140.30 g/mol.
To determine the molar mass of MgCrO4 (magnesium chromate), we need to calculate the sum of the atomic masses of each individual element in the compound.
The chemical formula MgCrO4 indicates that the compound consists of one magnesium atom (Mg), one chromium atom (Cr), and four oxygen atoms (O).
The atomic masses of the elements can be found on the periodic table:
Magnesium (Mg) has an atomic mass of approximately 24.31 g/mol.
Chromium (Cr) has an atomic mass of around 51.99 g/mol.
Oxygen (O) has an atomic mass of about 16.00 g/mol.
Now, we can calculate the molar mass of MgCrO4 by summing up the atomic masses of each element, considering the respective subscripts:
Molar mass = (Atomic mass of Mg) + (Atomic mass of Cr) + 4 × (Atomic mass of O)
Molar mass = (24.31 g/mol) + (51.99 g/mol) + 4 × (16.00 g/mol)
Molar mass = 24.31 g/mol + 51.99 g/mol + 64.00 g/mol
Molar mass ≈ 140.30 g/mol
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3. Once magnesium (Mg) gives up electron(s) to become an ion, it will become
Answer:
Option B. Cation that is smaller than the original atom.
Explanation:
Magnesium is a divalent element. This implies that magnesium can give up 2 electrons to become an ion (cation) as shown below:
Mg —> Mg²⁺ + 2e¯
Next, we shall write the electronic configuration of magnesium atom (Mg) and magnesium ion (Mg²⁺). This can be written as follow:
Mg (12) = 2, 8, 2
Mg²⁺ (10) = 2, 8
From the above illustration, we can see that the magnesium atom (Mg) has 3 shells while the magnesium ion (Mg²⁺) has 2 shells.
This simply means that the magnesium ion (Mg²⁺) i.e cation is smaller that the original magnesium atom (Mg).
Earth is surrounded by an envelope of gases called the
characteristics. of. rusting
Answer: metal turn orange and weaker as it gets oxidised
Explanation:
H2O2+CLO2====CLO-2+O2. Balance the equation using half reaction
Answer:
I have the explanation.
Explanation:
Question 8 (5 points)
(08.02 MC)
A 10 M concentrated stock solution of NaCl was used to prepare 5 liters of diluted 1 M solution. Which of the following statements is true about
the
process used to achieve this required dilution? (5 points)
O a
The volume of stock solution used was less than 0.4 liters.
Oь
The volume of stock solution used was more than 5 liters.
Ос
The volume of the solvent used was less than 0.4 liters.
Od
The volume of the solvent used was less than 5 liters.
Answer:
d . The volume of the solvent used was less than 5 liters.
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the volume of the stock (initial) solution by using the following equation:
\(M_1V_1=M_2V_2\)
Thus, we solve for, V1, which stands for the aforementioned volume of stock solution:
\(V_1=\frac{M_2V_2}{M_1}\)
Then, we plug in to obtain:
\(V_1=\frac{5L*1M}{10M}\\\\V_1=0.5L\)
Now, since the final volume was 5 L, we can infer that the volume of solvent is 4.5 L and that of the stock solution 0.5 L for a total of 5 L of diluted solution; therefore, the correct reasoning is d . The volume of the solvent used was less than 5 liters.
Regards!
Answer:
The volume of the solvent is less than 5
Explanation:
What system is used to help match DNA from crime scenes to a DNA database?
A.
CODIS
B.
AFIS
C.
NIBIN
D.
FBI
Answer:
A. CODIS
Explanation:
The Combined DNA Index System (CODIS), administered by the FBI, maintains DNA profiles obtained through federal, state, and local DNA sample collection programs, and makes this information available to law enforcement agencies across the country for law enforcement identification purposes.
Which step of mitosis involves the nucleus spitting and nuclear membranes forming around each new nucleus??
Answer:
telophase
Explanation:
If a hydrocarbon consists of 7 Carbon atoms and only contains single bonds, how many Hydrogen atoms does it
have?
16
Explanation:Hydrocarbons are compounds that only consist of hydrogens and carbons.
Saturation
For a hydrocarbon to be saturated, it must have the maximum amount of possible hydrogens. This means that a hydrocarbon will only have single bonds. The hydrocarbon described in the question (known as heptane) is saturated. To find the number of hydrogens in a saturated hydrocarbon we can use the formula 2x+2, where x is the number of carbons.
2(7) + 2 = 16Thus, the hydrocarbon has 16 hydrogens.
Lewis Structure
The formula above is based on the Lewis structure of hydrocarbons. The Lewis structure of a compound is a visual representation of the elements and bonds within the compound. Another way to find the number of hydrogens is by drawing the complete Lewis structure and then counting the hydrogens. Attached below is the Lewis structure of heptane.
A 1.00 liter solution contains 0.42 moles nitrous acid and 0.32 moles sodium nitrite .
If 0.16 moles of nitric acid are added to this system, indicate whether the following statements are true or false.
(Assume that the volume does not change upon the addition of nitric acid.)
A. The number of moles of HNO2 will decrease.
B. The number of moles of NO2- will remain the same.
C. The equilibrium concentration of H3O+ will increase.
D. The pH will decrease.
E. The ratio of [HNO2] / [NO2-] will increase
Answer:
E. The ratio of [HNO2] / [NO2-] will increase
D. The pH will decrease.
Explanation:
Nitrous acid ( HNO₂ ) is a weak acid and NaNO₂ is its salt . The mixture makes a buffer solution .
pH = pka + log [ salt] / [ Acid ]
= 3.4 + log .32 / .42
= 3.4 - .118
= 3.282 .
Now .16 moles of nitric acid is added which will react with salt to form acid
HNO₃ + NaNO₂ = HNO₂ + NaNO₃
concentration of nitrous acid will be increased and concentration of sodium nitrite ( salt will decrease )
concentration of nitrous acid = .42 + .16 = .58 M
concentration of salt = .32 - .16 = .16 M
ratio of [HNO₂ ] / NO₂⁻]
= .42 / .32 = 1.3125
ratio of [HNO₂ ] / NO₂⁻] after reaction
= .42 + .16 / .32 - .16
= 58 / 16
= 3.625 .
ratio will increase.
Option E is the answer .
pH after reaction
= 3.4 + log .16 / .58
= 2.84
pH will decrease.
What is the safe way to dispose of an acidic solution
I'd say by Neutralization so as to make it Harmless.
Or
You Over dilute it with Water
Note: You pour the acid into water...Not water into acid as it may spill and burn your skin.
Answer: D
Explanation:
What does the 195 represent in the isotope notation?
195Pt
78
This atom has a mass number of 195. Hence, there are 78 protons in an atom, which is the atomic number.
What is an example of an isotope?Atoms that belong to the same element with the same isotopes Z but a distinct mass number A are known as isotopes. Carbon-12, Carbon-13, while Carbon-14 are three isotopes of the element carbon, each with a mass of 12, 13, and 14.
What is an example of an isotope?Atoms that belong to the same element with an identical electron density Z but a distinct mass number A are known as isotopes. For instance, carbon-12, carbon-13, or carbon-14 are three isotopes of the crystal structures, with corresponding weights of 12, 13, and 14.
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When an element loses electrons, it forms *
Negative ions or anions
Positive ions or cations
neutral atoms or neutrons
alpha and beta particles
Answer: Positive ions or cations
Explanation:
The ions are formed when an atom gains or lose electrons.
The ions are classified into two which are called the cations and anions. The cation is classified as the positive charge formed by the loss of electrons. Example: \(Na^+\) is formed by the loss of one electron by \(Na\)
The anion is classified as the negative charge ion formed by the gain of electrons. Example : \(F^-\) is formed the gain of one electron by \(F\)
Thus when an element loses electrons, it forms positive ions or cations.