Answer:
Number of students-this has nothing to do with the question, its called a distractor.
The variable that would most likely not affect the time it takes the ice to melt is the Number of students. The correct option is C.
What are the variables in the experiments?Variables are the different substances or objects that participate in the experiment directly or indirectly. They are substances that together form the experiment. These variables impact the result of the experiment.
There are two types of variables. They are Dependent and independent variables. Dependent variables can be controlled in the experiment, but independent variables can't be controlled.
Students are performing the experiment, so they cannot be the variables because their presence or absence would be to impact the experiment.
Thus, the correct option is C. Number of students.
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Which of the following substituents is a moderate activator and an o/p director in electrophilic aromatic substitution reactions?
A) -Br
B) -SO3H
C) -CO2H
D) -NHCOR
E) -CHO
Answer:
NHCOR
Explanation:
In electrophilic aromatic substitution, certain substituents on the aromatic ring such as
-NHCOR are known to enhance ortho-para substitution. These ortho-para activating groups stabilizes the intermediate cation.
These ortho-para activating groups usually consists of species that donate electron density towards the reaction centre thereby stabilizing the carbocation and making the reaction faster.
A proposed mechanism for the reaction: 2 H2 + 2NO - N2 + 2H30 Step 1: H2g) + 2NO () - N2O (g) + H20) (slow) Step 2: N20cm) + H2 (g) - N2 (g) + H2O) (fast) What is the rate law and the intermediate respectively
Answer:
[tex]\text{Rate} = k\, [\mathrm{H_2\, (g)}]\cdot [\mathrm{NO\, (g)}]^2[/tex].
[tex]\rm N_2O\, (g)[/tex] is the intermediate.
Explanation:
RateBalanced overall reaction: [tex]\rm 2\, H_2\, (g) + 2\, NO\, (g) \to N_2\, (g) + 2\, H_2O\, (g)[/tex].
Proposed mechanism:
[tex]\rm H_2\, (g) + 2\, NO\, (g) \to N_2O\, (g) + H_2O \, (g)[/tex] (slow.)[tex]\rm N_2O\, (g) + H_2\, (g) \to N_2\, (g) + H_2O\, (g)[/tex] (fast.)Start with the slowest, rate-determining step of the proposed mechanism. Here, the rate-determining step is [tex]\rm H_2\, (g) + 2\, NO\, (g) \to N_2O\, (g) + H_2O \, (g)[/tex].
There are two species on the reactant side of this intermediate reaction: [tex]\rm H_2\, (g)[/tex] and [tex]\rm NO_2\, (g)[/tex]. The concentration of both of them should be in the rate expression of this step.
On the other hand, the coefficient of [tex]\rm H_2\, (g)[/tex] is one while the coefficient of [tex]\rm NO_2\, (g)[/tex] is two. Therefore, in the rate expression of this step, the concentration of [tex]\rm H_2\, (g)\![/tex] should have a power of one, while the concentration of [tex]\rm NO_2\, (g)\![/tex] should have a power of two.
include the rate constant [tex]k[/tex] to obtain the rate expression of the rate-determining slow step:
[tex]\text{Rate} = k\, [\mathrm{H_2\,(g)}]\cdot [\mathrm{NO\, (g)}]^2[/tex].
Make sure that all species in this rate expression are on the reactant side of the overall balanced reaction. Otherwise, further steps would be required to obtain the rate law of the overall reaction.
Therefore, by this proposed mechanism, the rate law of the overall reaction would be [tex]\text{Rate} = k\, [\mathrm{H_2\,(g)}]\cdot [\mathrm{NO\, (g)}]^2[/tex].
IntermediateIn a proposed reaction mechanism, a species is an intermediate if it appeared in one of the proposed steps, but not in the balanced overall equation.
The two steps of this proposed mechanism mentioned five species:
[tex]\rm H_2\, (g)[/tex].[tex]\rm NO\,(g)[/tex].[tex]\rm N_2O\, (g)[/tex].[tex]\rm H_2O\, (g)[/tex].[tex]\rm N_2\, (g)[/tex].With the exception of [tex]\rm N_2O\, (g)[/tex], all the other species appeared in the overall balanced equation. Therefore, [tex]\rm N_2O\, (g)\![/tex] is the intermediate.
A standard galvanic cell is constructed in which a Cu^2+ | Cu^+ half cell acts as the cathode Which of the following statements are correct?
(Choose all that apply)
A. Cr^3+|Cr could be the other standard half cell.
B. As the cell runs, anions will migrate from the other compartment to the Cu^2+|Cu^+ compartment.
C. I_2|I^- could be the other standard half cell.
D. Cu^+ is oxidized at the cathode.
E. In the external circuit, elections flow from the other compartment to the Cu^2+|Cu^+ compartment
Answer:
E. In the external circuit, elections flow from the other compartment to the Cu^2+|Cu^+ compartment
Explanation:
In a galvanic cell, electrons flow from anode to cathode. We must remember that oxidation occurs at the anode and reduction occurs at the cathode. Hence the process; M(s) -------> M^+(aq) + e occurs at the anode.
The electrons lost at the anode are conveyed to the cathode where they are accepted by other chemical species and are reduced to the corresponding reduced species according to the reaction; M^+(aq) + e -----> M(s)
Hence the Cu^2+ | Cu^+ half cell, being the cathode accepts electrons from the other half cell for this reduction reaction to take place, hence the answer
. What is the difference between the geometries of the bonding of the two oxygen atoms in acetic acid
Answer:
One oxygen atom is tetrahedral while the other is trigonal planar
Explanation:
Acetic acid contains two oxygen atoms. The two oxygen atoms are different and have different geometries.
The first oxygen atom which is part of the carbonyl moiety in the molecule is in a trigonal planar geometry since it is sp2 hybridized.
The second oxygen atom is in sp3 hybridized state hence it is tetrahedral.
Thus one oxygen atom is tetrahedral and the other is trigonal planar in acetic acid.
When 1.095 grams of NaOH was dissolved in a coffee cup calorimeter containing 150.00 grams of water, the temperature of the solution changed from 23.50 degree C to 25.32 degree C.
a) Calculate the heat of solution, Delta H_soln.
b) Calculate the Delta H_soln/mole of NaOH. The molar mass of NaOH is 40.00 grams/mole.
c) Is the heat of solution exothermic or endothermic?
Answer:
1. HEAT OF SOLUTION IS 1149.47 J
2. HEAT OF SOLUTION PER MOLE OF NaOH IS 41989.77 J/MOL OR 41.989 KJ/MOL
3. THE REACTION IS EXOTHERMIC
Explanation:
Mass of water = 150 g
Mass of NaOH = 1.095 g
Change in temperature = 25.32 - 23.50 = 1.82 C
Total mass of the mixture = 150 + 1.095 = 151.095 g
Specific heat capacity of water = 4.18 J/ g C
So to calculate the heat of solution, we have:
1. Heat of solution = mass * specific heat * change in temperature
Heat of solution = 151.095 * 4.18 * 1.82
Heat of solution = 1149.47 J
The heat of solution is therefore 1149.47 J or 1.15 kJ
2. Heat of solution per mole
1.095 g of NaOH produces 1149.47 J of heat
1 mole of NaOH contains 40 g
In other words:
1.095 g = 1149.47 J
40 g = x J
xJ = 40 * 1149.47 / 1.095
xJ = -41989.77 J
The heat of solution per mole of NaOH is -41.989 kJ / mol
3. The reaction is exothermic that is heat is evolved from the reaction. This is indicated by the negative sign.
Consider the following reaction at 298K.
2 H+(aq) + 2 Cr2+(aq) =H2(g) + 2 Cr3+(aq)
Which of the following statements are correct?
a) K > 1
b) ΔGo < 0
c) Eocell < 0
d) n = 2 mol electrons
The question is incomplete, the complete question is;
Consider the following reaction at 298K.
2 H+(aq) + 2 Cr2+(aq) =H2(g) + 2 Cr3+(aq)
Which of the following statements are correct?
Choose all that apply.
K > 1
ΔGo < 0
Eocell < 0
n = 2 mol electrons
The reaction is reactant-favored.
Answer:
K > 1
ΔGo < 0
n = 2 mol electrons
Explanation:
If we look at the reaction; 2 H+(aq) + 2 Cr2+(aq) -----> H2(g) + 2 Cr3+(aq), we will notice that the reaction is a spontaneous reaction because E°cell= 0-(-0.41) = 0.41 V
If the reaction is a spontaneous electrochemical process, we expect it to be product favoured with K>1. Also, a spontaneous reaction must have ∆G<0.
Lastly, we can see that two electrons were transferred according to the balanced equation for the electrochemical reaction.
Deduce the identity of the following compound from the spectral data given. C3H4BrN: H NMR, δ 2.98 (2H, triplet), 3.53 (2H, triplet) 13C NMR, δ 21.05 (triplet), 23.87 (triplet), 118.08 (singlet) (ppm):JR, 2963, 2254 cm" Express your answer as a chemical formula.
Answer: Br-CH₂-CH₂-C≡N (3-bromopropanenitrile)
Explanation:
The question tells us to " Deduce the identity of the following compound from the spectral data given. C3H4BrN: H NMR, δ 2.98 (2H, triplet), 3.53 (2H, triplet) 13C NMR, δ 21.05 (triplet), 23.87 (triplet), 118.08 (singlet) (ppm):JR, 2963, 2254 cm" Express your answer as a chemical formula".
Answer: Another Alternative to this is seen below
The Double Bond Equivalent of C₃H₄BrN = 3+1-4/2-1/2+1/2 = 2
2254 cm-1 Vc ≡N [IR analysis]
2963.4 = sp³Vc-H streek [IR analysis]
N≡C-CH₂-CH₂-Br (C₃H₄NBr)where the first CH₂ = b = 2.98 (2H,triplet) and
the second CH₂ = a = 3.53 (2H,triplet)
Note: where both are 1HNMR.
N≡C-CH₂-CH₂-Br
where C = c = 118.08 (singlet)
CH₂ = b = 21.05 (triplet)
CH₂ = a = 23.87 ( triplet)
Note: where all are 13CNMR
Important:
I have attached a copy of the solution to enhance better understanding in case the typed solution isn't clear enough.
Why are atoms of carbon-14(C-14) unstable?
Calculate the freezing point of a solution of 500.0 g of ethylene glycol dissovled in 500g water. Kf = 1.86 degrees C/m and Kb (which my instructor said was just extraneous info that is not used here) is 0.512 degrees C/m.
Answer: [tex]T_{f}[/tex] = -29.96 °C
Explanation: A solution has a lower freezing point compared to the pure solvent, due to the solute lowering the vapor pressure of the solvent.
The "new" freezing point is calculated as:
[tex]\Delta T_{f} = K_{f}.m[/tex]
[tex]K_{f}[/tex] is the molal freezing-point depression constant
m is molality concentration, i.e., moles of solute per kilogram of solvent
Before calculating freezing point, let's find moles of ethylene glycol ([tex]C_{2}H_{6}O_{2}[/tex]) in the solution:
Molar mass [tex]C_{2}H_{6}O_{2}[/tex] = 62.08 g/mol
For 500 g:
[tex]n = \frac{500}{62.08}[/tex]
n = 8.05 moles
The molality concentration for 0.5kg of water:
m = [tex]\frac{8.05}{0.5}[/tex]
m = 16.11
The freezing point will be:
[tex]\Delta T_{f} = K_{f}.m[/tex]
[tex]\Delta T_{f} = -1.86*16.11[/tex]
[tex]\Delta T_{f} = -29.96[/tex]
Freezing point of a solution of Ethylene Glycol and Water is -29.96°C
Barium fluoride, , is partially soluble with Ksp of 1.7e-06. What is the solubility of barium fluoride in pure water
Answer:
[tex]7.5x10^{-3}M[/tex]
Explanation:
Hello,
In this case, since the dissociation barium fluoride is represented at equilibrium by:
[tex]BaF_2(s)\rightleftharpoons Ba^{2+}(aq)+2F^-(aq)[/tex]
Hence, the equilibrium expression is:
[tex]Ksp=[Ba^{2+}][F^-]^2[/tex]
Whereas the molar solubility is represented as the reaction extent [tex]x[/tex]:
[tex]Ksp=[x][2x]^2[/tex]
In such a way, we can solve for [tex]x[/tex]:
[tex]1.7x10^{-6}=4x^3\\\\x=\sqrt[3]{\frac{1.7x10^{-6}}{4} } \\\\x=7.5x10^{-3}M[/tex]
Which as said before, is the molar solubility.
Best regards.
For each name, draw the structure.
a) (E)-5-Methyl-2-hexene
b) (S)-1,1,2-Trichloro-2-fluoroethane
c) 2,5-Diethyl-1-methylcyclohexanol
Answer:
See figure 1
Explanation:
For this question, we can analyze each molecule:
-) (E)-5-Methyl-2-hexene
In this case, we have a carbon chain of 6 carbons. We have a double bond between carbons 3 and 2. Also, we have a methyl group is placed on carbon 5. Finally, the "E" configuration makes reference to the double bond, the groups on each side of the double bond must have an opposite configuration.
-) 2,5-Diethyl-1-methylcyclohexanol
In this molecule, we have a carbon chain of 2 carbons. In carbon 2 we have two chlorine atoms. In carbon 1 we have a fluorine atom and a chlorine atom. The "S" configuration makes reference to carbon 1 (the chiral carbon), so we have to assign the priorities for each group bonded to carbon 1:
1 = Chlorine
2 = Fluorine
3 = Carbon 2
4 = Hydrogen
If we need an "S" configuration the priorities must be placed in such a way that we have a counterclockwise orientation.
-) 2,5-Diethyl-1-methylcyclohexanol
In this molecule, we have a cyclic carbon chain of 6 carbons. In carbon 1 we have an "OH" group and a methyl group. In carbon s 2 and 5, we have ethyl groups.
See figure 1
I hope it helps!
What kind of intermolecular forces act between a chloramine NH2Cl molecule and a water molecule?
Note: If there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.
Answer:
Dispersion forcesHydrogen bondingDipole-dipole forceExplanation:
Dispersion force is caused by weak Van der Waals attraction between molecules.
Because chloroamine and water are both polar solvents, dipole-dipole force of attraction exists between them. There is also hydrogen bonding present from the water molecules.
Answer: The forces present include;
1. Hydrogen bonding
2. Dispersion bonding
3. Dipole to Dipole bonding.
Explanation:
1. Hydrogen bonding is an electrostatic force that occur between atoms of hydrogen which is covalently bonded to electronegative atoms.
2. Dispersion force is type of force that occur between molecules which is caused by weak Van der Waals attraction between molecules.
3. Dipole -Dipole force occur when atoms with partial charges within a molecule attract themselves with another opposite opposite partial charge that is around the molecule.
Therefore,
Because chloroamine and water are both polar solvents, hydrogen bond, dispersion force and dipole-dipole force of attration occur between them. The hydrogen bonding occur between the water molecules.
When you're deciding what to eat, you may want to consider the environmental impact of your meal. Rank these four foods according to the amount of resources (land or grain) required to produce 1kg of each.
1. Egg
2. Chicken
3. Pork
4. Beef
A. Least resources required
B. Most resources required
Answer:
From the most resources to the least, it is 3, 4, 2, 1.
Explanation:
Pork is a large animal but not as much as a cow but it also does not produce as much meat as a cow. In terms of land required and total meat produced, pork is the highest on this list so it is option B.
The most amount of land and resources are taken up by cows, but they also produce a lot more meat than porks so they are in the second place on this list.
Chickens require a small amount of space but produce little meat.
If we guess that each egg weighs 60 grams, 1 kg of eggs equals to almost 17 eggs which a single chicken can produce easily. So the eggs require the least resources which means that they are option A.
I hope this answer helps.
What is the chemical potential of an element in its standard state? Select the correct answer below: −1.00kJ/mol 0kJ/mol 1.00kJ/mol 9.384kJ/mol
Answer:
0 kJ/mol.
Explanation:
Hello,
In this case, since the chemical potential can be represented in terms of the Gibbs free energy of formation:
[tex]\mu = \frac{\Delta _fG}{n}[/tex]
Thus, since the Gibbs free energy of formation of an element is zero, the chemical potential is also zero, or just 0 kJ/mol.
Best regards.
Nurse Antonio measured out 7 grams of sodium chloride (NaCI). Using dimensional analysis, calculate how many moles of NaCI he weighed out.
Answer:
0.119 moles
Explanation:
Given that,
Mass measured by Nurse Antonio is 7 grams of NaCl
To find,
The no of moles of NaCl
Solution,
The number of moles is given by
[tex]n=\dfrac{m}{M}[/tex]
m is given mass
M is molar mass
For NaCl, molar mass is 23+35.5 = 58.5 grams
So,
[tex]n=\dfrac{7}{58.5}\\\\n=0.119\ \text{moles}[/tex]
Therefore, there are 0.119 moles of NaCl.
how many significants are in 54.0047
Answer:
There are 6
Explanation:
The significant figures in that number are 5 4 0 0 4 7
Hope this helps:)
A 0.0447−mol sample of a nutrient substance, with a formula weight of 114 g/mol, is burned in a bomb calorimeter containing 6.19 × 102 g H2O. Given that the fuel value is 6.13 × 10−1 in nutritional Cal when the temperature of the water is increased by 5.05°C, what is the fuel value in kJ in scientific notation?
Answer:
The value is [tex]x = 2.565 *10^{3} \ kJ/kg[/tex]
Explanation:
From the question we are told that
The no of moles of the sample is n = 0.0447 mole
The formula weight is [tex]M = 114 \ g/mol[/tex]
The mass of water is [tex]m = 6.19 *10^{2}\ g[/tex]
The amount of the fuel is [tex]f= 6.13*10^{-1} \ nutritional \ Cal[/tex]
The temperature rise is [tex]\Delta T = 5.05^o[/tex]
Generally
[tex]1 \ nutritional \ Cal => 4.184*10^{3} \ kJ/kg[/tex]
=> [tex]f= 6.13*10^{-1} \ nutritional \ Cal \to x[/tex]
=> [tex]x = \frac{6.13 *10^{-1} * 4.184 *10^{3}}{1}[/tex]
=> [tex]x = 2.565 *10^{3} \ kJ/kg[/tex]
taxes you pay to the federal government are: A.federal taxes B.import taxes C.state taxes D.export taxes
Answer:
A federal taxes
Explanation:
because these are taxes paid to the federal government of a state
Answer:
Hey there!
As the name suggests, you pay Federal Taxes to the government.
Let me know if this helps :)
A student determines the mass of a metal rod to be 39.35 g. it is places in 10.00 mL of water, and the water level rises to 15.00 mL. What is the density of the rod?
Answer:[tex]\rho=7.87g/mL[/tex]
Explanation:
Hello,
In this case, we are analyzing a problem in which the Archimedes principle is considered, thus, as the volume of the metal rod is determined by the difference between the mass of the water and the mass of the water and the rod:
[tex]V_{rod}=15.00mL-10.00mL=5.00mL[/tex]
In such a way, the density turns out:
[tex]\rho =\frac{m_{rod}}{V_{rod}}=\frac{39.35g}{5.00mL} \\ \\\rho=7.87g/mL[/tex]
Regards.
Nuclear fusion always results in
A. a net loss of mass
B. a net gain of mass
C. no change in mass (mass is conserved)
D. depends on the nucleons that fuse
Answer:
D
Explanation:
In this time there are made a lot of nuclear bombs so itatters on how what how much damage it makes according to its capacity in my opinion.
Nuclear reaction of which nuclear fusion is a type which depends on the nucleons that fuse as the total mass of single nucleus is less than that of two original nuclei.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
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A pool is 34.0 m long and 31.0 m wide. How many mL of water are needed to fill the pool to an average depth of 4.98 ft? Enter your answer in scientific notation.
____x10___mL
Answer:
Amount of water in mL = 1.75⁹ × 10 ml (Approx)
Explanation:
Given:
Length of pool = 34 m
Width of pool = 31 m
Height of pool = 4.98 ft
Find:
Amount of water in mL
Computation:
1 ft = 0.3048 m
Height of pool = 4.98 (0.3048)
Height of pool = 1.5179 m
Volume of pool = (34)(31)(1.5179)
Volume of pool = 1,754.70 m³
1 m³ = 10⁶ ml
Amount of water in mL = 1,754.70 × 10⁶ ml
Amount of water in mL = 1.75⁹ × 10 ml (Approx)
An aerosol is a colloidal _____ suspended in a _____. A.liquid B.solid C.gas
Answer:
An aerosol is a colloidal A. liquid suspended in a C. gas.
Explanation:
Hence an aerosol is a colloidal solid or liquid suspended in a gas Smoke or fog, for example.
define aerosol?Aerosol is a system of equally dispersed, finely divided liquid or solid particles passing through a gas, often air. Dust and other aerosol particles, which serve as the nuclei for condensation and freezing, are crucial to the precipitation process.
Which two forms of aerosols exist?Secondary aerosols develop when gas is converted into a particle, whereas primary aerosols are made up of particles that are added directly to the gas. Key aerosol categories include sulfates, organic carbon, black carbon, nitrates, mineral dust, and sea salt. These substances typically clump together to create complicated mixtures.
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Write a chemical equation for the reaction that occurs in the following cell: Cu|Cu2+(aq)||Ag+(aq)|Ag. Of the two metals, copper and silver, which is the anode and which is the cathode?
Answer:
Explanation:
We are to write a chemical equation for the reaction that occurs in the following cell: Cu|Cu2+(aq)||Ag+(aq)|Ag.
And to determine which one of the two metals, (copper and silver) is the anode and which is the cathode?
The chemical equation for the reaction is as follows:
[tex]\mathbf{Cu + 2Ag^+ \to Cu^{2+}+2Ag}[/tex]
The atoms of the Copper electrodes undergo oxidation and loses two electrons each to form copper II ions [tex](Cu^{2+})[/tex] which go into the solution. The copper then becomes negatively charged and functions as the negative electrode i.e the anode
The oxidation half reaction is:
[tex]\mathsf{Cu \to Cu^{2+} + 2e^-}[/tex]
The silver ions [tex]Ag^+[/tex] becomes reduced by gaining two electrons each from the metallic copper which was deposited into the silver electrode. The silver electrode thus becomes positively charged and functions as the positive electrode. i.e the cathode.
The reduction half reaction is:
[tex]\mathtt{Ag^+ + 1 e^- \to Ag}[/tex]
Larissa needs to make 500ml of 2.00 M NaCl. The molecular weight of NaCl is 58.44. How does she make 500ml of 2.00 M NaCl? Question 3 options: A) Measure 29.22g NaCl and dissolve it into 500ml water. B) Measure 29.22g NaCl, dissolve it into 400ml water, and then top off to 500ml in a volumetric flask. C) Measure 58.44g NaCl and dissolve it into 500ml of water. D) Measure 58.44g NaCl, dissolve it into 400ml water, and then top off to 500ml in a volumetric flask.
Answer:
D) Measure 58.44g NaCl, dissolve it into 400ml water, and then top off to 500ml in a volumetric flask.
Explanation:
Step 1: Given data
Molarity (M): 2.00 M
Volume (V): 500 mL = 0.500 L
Molar mass of NaCl: 58.44 g/mol
Step 2: Calculate the required moles of NaCl
We will use the following expression.
n = M × V
n = 2.00 mol/L × 0.500 L
n = 1.00 mol
Step 3: Calculate the mass corresponding to 1.00 moles of NaCl
1.00 mol × 58.44 g/mol = 58.44 g
Step 4: Describe the procedure to prepare the solution
Measure 58.44g NaCl, dissolve it into 400ml water, and then top off to 500ml in a volumetric flask.
Answer:
D) Measure 58.44g NaCl, dissolve it into 400ml water, and then top off to 500ml in a volumetric flask.
Explanation:
I got it right in class!
Hope this helps!! :))
9.
The main difference between the salt in the Dead
Sea and salt in the school lab is that
A salt in the Dead Sea is saltier.
B salt in the Dead Sea is iodized while that
of the lab is uniodized.
C salt in the Dead Sea is sodium chloride while
that of the lab has its hydrogen replaced.
D salt in the Dead Sea is sodium chloride
while salt in the lab is either soluble or
insoluble in water.
The correct option is A.
What is the main difference between salt in the Dead Sea and salt in the school lab?
Ordinary sea salt is 97 percent sodium chloride whereas Dead Sea salt is a mixture of lots of different chloride and bromide salts.
What's the difference between sea salt and Dead Sea salt?Dead Sea Salt differs greatly from other sea salts in mineral content, is made up of sodium chloride with a high percentage of magnesium, sulfates, and potassium. You can bring that ancient, therapeutic experience home with our guaranteed authentic Dead Sea bath salts.
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What is the mass in grams of 366mL of ethylene glycol
Answer:
[tex]m=406.26g[/tex]
Explanation:
Hello,
In this case, since the density is defined as the degree of compactness of a substance and it mathematically defined as the ratio of the mass and volume:
[tex]\rho = \frac{m}{V}[/tex]
By knowing that its density is 1.11 g/mL, the mass in 366 mL is:
[tex]m=\rho V=366mL*1.11\frac{g}{mL}\\ \\m=406.26g[/tex]
Regards.
Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia . What mass of ammonium p
Answer:
7.5 g
Explanation:
There is some info missing. I think this is the original question.
Ammonium phosphate ((NH₄)₃PO₄) is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H₃PO₄) with ammonia (NH₃). What mass of ammonium phosphate is produced by the reaction of 4.9 g of phosphoric acid? Be sure your answer has the correct number of significant digits.
Step 1: Write the balanced equation
H₃PO₄ + 3 NH₃ ⇒ (NH₄)₃PO₄
Step 2: Calculate the moles corresponding to 4.9 g of phosphoric acid
The molar mass of phosphoric acid is 98.00 g/mol.
[tex]4.9 g \times \frac{1mol}{98.00g} = 0.050mol[/tex]
Step 3: Calculate the moles of ammonium phosphate produced from 0.050 moles of phosphoric acid
The molar ratio of H₃PO₄ to (NH₄)₃PO₄ is 1:1. The moles of (NH₄)₃PO₄ produced are 1/1 × 0.050 mol = 0.050 mol.
Step 4: Calculate the mass corresponding to 0.050 moles of ammonium phosphate
The molar mass of ammonium phosphate is 149.09 g/mol.
[tex]0.050mol \times \frac{149.09 g}{mol} = 7.5 g[/tex]
Acetic acid and water react to form hydronium cation and acetate anion, like this: (aq)(l)(aq)(aq) Imagine of are added to a flask containing a mixture of , , and at equilibrium, and then answer the following questions. What is the rate of the forward reaction before any HCH3CO2 has been added to the flask
The question is incomplete. Here is the complete question.
Acetic acid and water react to form hydronium cation and acetate anion, like this:
[tex]HCH_{3}CO_{2}_{(aq)}+H_{2}O_{(l)} -> H_{3}O^{+}_{(aq)}+CH_{3}CO_{2}^{-}_{(aq)}[/tex]
Imagine 226 mmol of [tex]CH_{3}CO_{2}^{-}[/tex] are added to a flask containing a mixture of [tex]HCH_{3}CO_{2}[/tex], [tex]H_{2}O[/tex],[tex]H_{3}O^{+}[/tex] and [tex]CH_{3}CO_{2}^{-}[/tex] at equilibrium and then answer the following questions:
1) What's the rate of the reverse reaction before any [tex]CH_{3}CO_{2}^{-}[/tex] has been added to the flask?
a) 0
b) Greater than 0, but less than the rate of the forward reaction
c) Greater than 0, but equal to the rate of the forward reaction
d) Greater than 0, but greater than the rate of the forward reaction
2) What is the rate of the reverse reaction just after the [tex]CH_{3}CO_{2}^{-}[/tex] has been added to the flask?
a) 0
b) Greater than 0, but less than the rate of the forward reaction
c) Greater than 0, but equal to the rate of the forward reaction
d) Greater than 0, but greater than the rate of the forward reaction
3) What is the rate of the reverse reaction when the system has again reached equilibrium?
a) 0
b) Greater than 0, but less than the rate of the forward reaction
c) Greater than 0, but equal to the rate of the forward reaction
d) Greater than 0, but greater than the rate of the forward reaction
4) How much more [tex]CH_{3}CO_{2}^{-}[/tex] is in the flask when the system has again reached equilibrium?
a) None
b) Some, but less than 226 mmol
c) 226 mmol
d) More than 226 mmol.
Answer: 1) c) Greater than 0, but equal to the rate of the forward reaction
2) d) Greater than 0, but greater than the rate of the forward reaction
3) c) Greater than 0, but equal to the rate of the forward reaction
4) b) Some, but less than 226 mmol
Explanation: A reversible chemical reaction reaches its equilibrium when forward and reverse reaction are at the same rate. At that point, equilibrium has a constant called K.
Equilibrium constant depends on the concentration of its products and reagents.
For the reaction [tex]HCH_{3}CO_{2}_{(aq)}+H_{2}O_{(l)} -> H_{3}O^{+}_{(aq)}+CH_{3}CO_{2}^{-}_{(aq)}[/tex],
the forward is towards production of [tex]CH_{3}CO_{2}^{-}[/tex] and reverse is towards the production of [tex]HCH_{3}CO_{2}[/tex].
1) When equilibrium is reached, forward and reverse are at the same rate and are different from zero.
2) When adding a compound, the equilibrium is broken. So, to go back to the equilibrium, reaction tend to counteract the change. In the case of acetic acid and water above, when adding acetate anion, the reverse reaction will produce more acetic acid to restore equilibrium, so reverse reaction will be at a greater rate and different from 0.
3) After a while when the system is back to the equilibrium, the rate will be equal again.
4) After second equilibrium, acetate anion will have less mmol than when this new equilibrium state started.
Which diagram shows a pattern similar to the emission spectrum of hydrogen?
A chemistry student answered 81 questions correctly on a 90-question test. What
percent of the questions did they get CORRECT?
HURRY PLEASE
Answer:
90%
Explanation:
it will be 81/90 ×100/1
81 over 90 × 100 over 1