The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol
Given data :
Volume of solution to be tested for I-ion = 10 mL
Volume of Pb(NO₃)₂ = 0.2 mL
molarity of Pb(NO₃)₂ = 0.13 M
Determine the number of I that must be presentFirst step : calculate conc of PB²⁺ ions in the solution
conc of PB²⁺ ions = ( molarity of Pb(NO₃)₂ * volume of Pb(NO₃)₂ ) / ( total volume )
= ( 0.13 * 0.2 ) / ( 10 + 0.2 )
= ( 0.026 ) / ( 10.2 ) = 0.002549 M
Next step : determine the molarity of I
using the dissociation reaction of PbI₂
PbI₂(s) ---> Pb²⁺ (aq) + 2I (aq)
also; Ksp = [ Pb²⁺ ] [ I ]² ---- ( 1 )
From the question the given value of Ksp = 8.49 * 10⁻⁹
Therefore equation ( 1 ) becomes
8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²
[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )
= 0.0018 M
Final step : Determine the minimum number of grams of I
moles of I = molarity of I * total volume
= 0.0018 M * 10.2 mL
= 0.01836 * 10⁻³ mol
Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol
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Arrange the following acids from strongest to weakest:
HF, HBr, HCl, HI
Answer:
HI>HBr>HCL>HF
Explanation:
How to do Lewis structure for Al?
Notes:-
Al has Z=15electron configuration:-
[Ne]3s²3p³Valency is 3
So 3 dots are included
Which water usage uses the least amount of water in a year in the United States
A : industry
B : irrigation
C : livestock
D : public water supply
Answer: a
Explanation:
Industry uses only about 18% while the others use around 70-90% of water.
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A sample of excited atoms lie 3.314×10−19 J above the ground state. Determine the emission wavelength of these atoms.
The emission wavelength of the atoms excited above the ground state is 599.8 nm.
Emission wavelength of the atomsThe emission wavelength of the atom is determined by using the following formulas as shown below;
E = hf
E = hc/λ
where;
E is the energy of the atomh is Planck's constantc is speed of lightλ is the emission wavelengthλ = hc/E
λ = (6.626 x 10⁻³⁴ x 3 x 10⁸) / (3.314 x 10⁻¹⁹)
λ = 5.998 x 10⁻⁷ m
λ = 599.8 x 10⁻⁹ m
λ = 599.8 nm
Thus, the emission wavelength of the atoms is 599.8 nm.
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Granite is part of the crust layer of the earth.
True
False
Answer:
That would be True
Explanation:
granite is a part of the crust layer.
What separation technique would most likely be used if a solvent were
saved?
A. Melting point separation
B. Distillation separation
C. Density separation
O D. Chromatography separation
The statement, that describes separation technique would most likely be used if a solvent were saved is "distillation separation."
What is separation technique?Separation techniques are methods for separating two different states of matter, such as liquid and solid. Methods that employ variations in physical qualities to separate the components of a mixture, such as evaporation, distillation, filtration, and chromatography, can be used to physically separate the components of a mixture.
Simple distillation is a technique for removing a solvent from a solution. Water, for example, can be extracted from salt solution by simple distillation. If a solvent was saved, the separation procedure would most likely be used is distillation.
Hence the correct option is B.
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New materials can be constructed molecule-by-molecule and atom-by-atom using ______________ in their design.
Volume of distillate = 300 ml
Volume of Ethanol in the mixture = 450 ml
% Recovery =
Based on the distillation data provided, the percent recovery of ethanol is 66.7%
What is distillation?Distillation is a separation technique which is used to separate two miscible liquids based on differences in their boiling points.
At the boiling point of the first liquid, it distills over and is obtained by condensation.
The liquid obtained is known as distillate.
In the distillation of ethanol, the percent recovery is calculated as follows:
Percent recovery = (volume of distillate/volume of ethanol in mixture) × 100%From the data given:
Volume of distillate = 300 mlVolume of Ethanol in the mixture = 450 mlPercent Recovery = (300/450) × 100%
Percent recovery = 66.7%
Therefore, the percent recovery of ethanol is 66.7%.
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A chemistry assignment has a student conduct a single replacement reaction by adding 7.5g of sodium metal to 20.0g of aluminum chloride. How much aluminum in moles would precipitate out as a result of the reaction
Answer: 0.109 mol
Explanation:
Balanced chemical equation:
3 Na(s) + AlCl3(aq) --> 3 NaCl(aq) + Al(s)
3 moles of sodium metal react with 1 mole of aluminum chloride to produce 3 moles of aluminum chloride and 1 mole of solid aluminum
Molar mass of Na = 22.99 g/mol
Mass(Na) = 7.5 g
Find number of moles of Na:
n = mass of Na/molar mass of Na
=(7.5 g)/(22.99 g/mol)
= 0.3262 mol
Molar mass of AlCl3,
MM = 1*MM(Al) + 3*MM(Cl)
= 1*26.98 + 3*35.45
= 133.33 g/mol
Mass(AlCl3) = 20.0 g
Find number of moles of AlCl3,
n = mass of AlCl3/molar mass of AlCl3
=(20 g)/(1.333*10^2 g/mol)
= 0.15 mol
Balanced chemical equation is:
3 Na + AlCl3 ---> Al + 3 NaCl
3 mol of Na reacts with 1 mol of AlCl3
for 0.3262 mol of Na, 0.1087 mol of AlCl3 is required
But we have 0.15 mol of AlCl3
So, Na is the limiting reagent and we will use it in our further calculations.
According to balanced equation:
mol of Al formed = (1/3) * moles of Na
= (1/3)*0.3262
= 0.1087 mol
Answer: 0.109 mol of aluminum will precipitate out as a result of the reaction
Suggest some ways in which you might determine whether a particular water solution contains an acid or a base.
The use of the pH scale and litmus paper are the ways which can determine whether the solution is an acid or base.
How pH scale and litmus paper tell about acidic and basic solution?The pH scale is the way which determine the acidic or basic nature of a solution. If the pH of a solution is less than 7, it is considered as acidic. If the pH is 7, the solution is neutral and if the pH is greater than 7,the solution is basic.
While on the other hand, litmus paper also tells us about acidic and basic nature of solution. if the litmus paper turns red, it means the solution is acidic whereas if the litmus paper turns blue it means basic.
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Gives 2 reaction in which benzene ring is retained and 2 reaction in which benzene ring is not retained
Hey dear,
Benzene is a 6-C cyclic structure with alternate double bonds.
● Reactions -
1) Benzene to cyclohexane -
Benzene can be reduced to cyclohexane with
the help of Ni/H2. C6H6 + 3H2 --> C6H12
All 3 double bonds in ring are reduced here.
2) Benzene to benzoquinone - Benzene can be oxidized to benzoquinone with
the help of acidic K2Cr207. C6H6 +3[O] --> C6H4O2 + H2O
Only 1 double bond is lost in this reaction.
Hope this helps you.
What happens when the temperature of a gas is increased?
O A. The boiling point will increase,
O B. The collisions between molecules will decrease,
O C. The volume will increase,
D. The pressure will decrease,
What is added to balance hydrogen and oxygen atoms in an oxidation-
reduction reaction in basic solution?
A. OH and H2O
B. Ht and H20
C. H2 and 02
D. OH and Ht
Answer:
OH^- and H_2O
Explanation:
Remember these things about basic and acidic medium
In acidic medium we add H+ to balance Hydrogen and H_2O for OxygenIn basic we add OH- which turns H+ to waterChem dissociation!
Calculate degree of dissociation of electrolyte, if you know that in the 2 M solution there is 0.2 mol of this electrolyte as ions.
Answer:
C. Strong electrolytes can be expected to 100% dissociate in aqueous solution
Explanation:
Help me plssssssssss
Answer:
The answer for this selection is 4
Explanation:
An ion has 14 protons and a charge of “+2”. How many electrons does it have?
Answer : 12
It has a +2
Take it out from 14
The force of a hammer drives a nail into wood. This is an example of? A. An unbalanced force. B. Gravitational force. C. Friction. D. Balanced forces.
Answer:
The answer is A. an unbalanced force
Explanation:
This is because the force from the hammer on the nail causes a force that unbalanced normal forces on the nail.
A sample of PH3, occupying 1.50 L at 25 oC and 0.80 atm, reacts with 0.080 atm, reacts with 2.28L of O2 at 20.0 oC and 0.100 atm according to the following equation:
4 PH3(g) + 8 O2(g) => P4O10(s) + 6 H2O(g)
How many grams of each product is produced? How many grams of each reactant are left at the end of the reaction? What is the final pressure at the end of the reaction? (The final volume is 3.88L and the final temperature is 22.5C).
The ideal gas equation can be used to obtain the pressure, number of moles, volume and temperature of a gas.
What is the ideal gas equation?The ideal gas equation gives the relationship between pressure, number of moles, volume and temperature.
To obtain the number of moles of PH3
PV = nRT
n = PV/RT
n = 0.80 atm * 1.50 L/0.082 atmL/Kmol * 298 K
n = 0.049 moles
Number of moles of O2
PV = nRT
n = PV/RT
n = 0.100 atm * 2.28L /0.082 atmL/Kmol * 293 K
n = 0.0095 moles
Fom the reaction equation;
4 moles of PH3 reacts with 8 moles of O2
0.049 moles of PH3 reacts with 0.049 moles * 8/4 moles
= 0.098
Hence O2 is the limiting reacatant.
Mass of P4O10 produced =
8 moles of O2 yields 1 mole of P4O10
0.0095 moles of O2 yields 0.0095 moles * 1 mole/8 moles
= 0.0012 moles
Mass of P4O10 = 0.0012 moles * 284 = 0.34 g
Mass of water;
8 moles of O2 yields 6mole of water
0.0095 moles of O2 yields 0.0095 moles * 6 moles/8 moles
=0.0071 moles
Mass of water = 0.0071 moles * 18 g/mol = 0.13 g
Since 4 moles of PH3 reacts with 8 moles of O2
x moles of PH3 reacts with 0.0095 moles of O2
x = 0.0048 moles
Moles of PH3 left over = 0.049 moles - 0.0048 moles = 0.0442 moles
Mass of PH3 left over = 0.0442 moles * 34 g/mol
= 1.5 g
No mass of O2 is left over because the limiting reactant is used up.
Total moles of gas left after the reaction = 0.0442 moles + 0.0071 moles = 0.0513 moles
P = nRT/V
P = 0.0513 moles * 0.082 atmL/Kmol * 295.5/3.88L
P= 0.32 atm'
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Explain how humans get muscle cramps
Answer:
Humans get muscle cramps when they start sport movemement wih out training and there is a store of calorie and amino acids so when it heated fastly there were some disease like muscle cramps
In the reaction between 15.8 g of NH3 and 22.7 g oxygen, water and nitrogen monoxide are
produced. Determine which reactant is limiting and calculate the number of grams of each
product.
Explanation:
limiting is NH3
NO:27/88g
H2O: 25/09g
1. List the actual volume of titrant needed to produce a color change for Sample A and Sample B. Answer: Volume of titrant needed to produce a color change for Sample A:\ ml Volume of titrant needed to produce a color change for Sample B: ml
Answer: B Hope this helps :)
One material property that is widely used and recognized is the strength of a material. But what does the word "strength" mean? "Strength" can have many meanings, so let us take a closer look at what is meant by the strength of a material. We will look at a very easy experiment that provides lots of information about the strength or the mechanical behavior of a material, called the tensile test.
The basic idea of a tensile test is to place a sample of a material between two fixtures called "grips" which clamp the material. The material has known dimensions, like length and cross-sectional area. We then begin to apply weight to the material gripped at one end while the other end is fixed. We keep increasing the weight (often called the load or force) while at the same time measuring the change in length of the sample.
Explanation:
how have your thoughts changed about Evolution overtime
Answer:
monkey see, monkey do
Explanation:
boom :)
Answer:
I think it's a game with me and I will knock out a bit and I hope you are u all the way you can get a little bit of a good time to come over here in a bit of the world
Which of the following are characteristics of stratovolcanoes? Select all that apply.
More common near convergent boundaries
More common at hotspots
Effusive eruptions
Explosive eruptions
High viscosity magma
Low viscosity magma
Answer:
More common near convergent boundaries
Explosive Eruptions
Low Viscosity Magma
Explanation:
Hot spots like hawaii are better known for shield volcanoes. The magma is high viscosity which causes them to build pressure before erupting, leading to explosive eruptions.
______ contributes to the nitrogen cycle by removing nitrogen from the air and converting it into a form that is usable by plants.
plants
earthworms
fungi
bacteria
The complete statement is "Bacteria contribute to the nitrogen cycle by removing nitrogen from the air and converting it into a form that is usable by plants." This is further explained below.
What is Bacteria?Generally, Bacteria are mono-celled tiny creatures that can be beneficial. Bacteria are germs with a simpler cell structure than many other creatures.
In conclusion, Bacteria contribute to the nitrogen cycle by removing nitrogen from the air and converting it.
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Answer:bacteria
Explanation:
What metal speeds up rusting
Answer:
Vinegar
Explanation:
What liquid makes metal rust the fastest? Vinegar speeds up rusting because it contains a dilute form of acetic acid; positive hydrogen ions in the acid remove electrons from iron, ionizing it and making it susceptible to rust. How do you rust metal quickly?
Answer:
iron, especially if it is exposed to water and oxygen
14. Calculate the mass in grams of oxygen required to react completly with 0.75 moles of Aluminum.
4Al + 302 → 2Al2O3
a. 32 g of Oxygen
b. 18 g of Oxygen
c. 16 g of Oxygen
d. 9.0 g of Oxygen
Moles of O_2:-
0.75(0.75)0.5625molMass of O_2:-
moles(Molar mass)0.5625(32)18gOption B
As per the given balanced reaction, 0.75 moles of aluminum metal requires 0.56 moles of oxygen gas for completely reaction. One mole of oxygen gas is 32 g. Then, mass of 0.56 moles is 18 g.
What is aluminum oxide ?Metals and metal like elements such as aluminum Al are more reactive towards atmospheric oxygen and forms their oxide layers in the metallic surface.
Al₂O₃ is an essential mineral of aluminum formed by the reaction with oxygen as given in the balanced chemical equation. As per this equation, 4 moles of Al requires 3 moles of oxygen for complete reaction.
The number of moles of oxygen required by 0.75 moles of Al is:
(0.75 × 3) /4 = 0.56 moles.
one mole of oxygen weighs 32 g/mol.
mass of 0.56 moles of O₂ = 32 × 0.56 = 18 g.
Therefore, the mass required by 0.75 moles of Al in the reaction is 18 g.
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Write and balance tin and copper(ii) oxide react to form copper and tin IV oxide
Answer:
tin Is more reactive than copper so it reduces oxygen from copper
explain chemical equilibrium
Answer:
chemical equilibrium, condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs. A reversible chemical reaction is one in which the products, as soon as they formed, react to produce the original reactants.
Explanation:
chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time, so that there is no observable change in the properties of the system.
.
Rocks containing _____ have magnetic properties.
lodestar
iron
magnesia
magnetite
Answer: Iron
Explanation: There are little minnerals that make it magnetic.
Kinetic friction is the frictional force needed to start an object at rest into
motion.
O A. True
O B. False
Answer:false you are welcome
Explanation:
Answer: False I hope this helpful please mark me brainlist
Explanation:
Kinetic friction is the friction acting upon a moving object. It would be the frictional force against you if you pulled a box across a table.Static friction is the frictional force needed to overcome to get an object at rest into motion.