Answer:
How can we make use of acids or bases to remove heavy metals from soils? We can remove heavy metals from soil by adding acid and catching the solution that drains through. Acids can react with metals turning metalic compounds which can be dissolved by water and washed away. Improve crop yields?
Explanation:
a student requires to prepare 500ml of 0.1M potassium dichromate (vii) from 0.250M solution must be diluted to 500ml
The volume required : 0.2 L
Further explanationGiven
500ml of 0.1M potassium dichromate (vii)
0.25 solution
Required
The volume
Solution
We can use dilution formula :
M₁V₁=M₂V₂
M₁ = 0.25
M₂ = 0.1
V₂ = 500 ml = 0.5 L
The initial volume taken :
V₁=(M₂V₂)/M₁
V₁=(0.1 x 0.5)/0.25
V₁=0.2 L
HELPPPPPPPPPP/AYUDAAAAAA
Answer:
*helps*
Explanation:
What volume is occupied by 2.719 x 1013 moles of methane gas, CH4?
Answer:
6.5256×10¹⁴
Explanation:
n= v/24
v= n×25
v= 2.719×10¹³ × 24= 6.5256×10¹⁴ moles/dm³
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According to ideal gas equation, the volume occupied by 2.719 x 10¹³ moles of methane gas is 6174.76×10¹³cm³.
What is ideal gas equation?The ideal gas equation is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.Ideal gases exist in hypothetical state.The law was proposed by Benoite Paul Emile Clapeyron in 1834.
Substituting values of pressure=1 atmosphere,number of moles=2.719 x 10¹³ ,R=8.314 ,T=273.15 K.
Therefore volume=nRT/P=2.719x 10¹³×8.314×273.15/1=6174.76×10¹³ cm³.
Thus, the volume occupied by 2.719 x 10¹³ moles of methane gas is 6174.76×10¹³cm³.
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PLZ HELP ME!!!! BEING TIMED!!!!
Answer:
it will A. d. e. f option above
do all atoms only have one oxidation state
Which of the following is NOT true about one mole?
the number of atoms in 1 mole of carbon equals the number of atoms in 1 mole of boron
O 12 g of carbon equals one mole of carbon atoms
the mass of 1 mole of carbon atoms equals the mass of 1 mole of boron atoms
one mole contains 6.02 x 10
23
particles
The number of atoms in 1 mole of carbon equals the number of atoms in 1 mole of boron is false because the molar mass of carbon is different from that of boron. Option A is correct.
The number of moles of an element is expressed as the ratio of the mass of the substance to its molar mass.Moles = Mass/Molar massThis shows that the number of moles of the substance is dependent on the molar mass of the substance.
From the listed option the number of atoms in 1 mole of carbon equals the number of atoms in 1 mole of boron is false because the molar mass of carbon is different from that of boron
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how will you ensure your server is protected from data hacks?
Answer:
Establish and Use a Secure Connection
Use SSH Keys Authentication
Secure File Transfer Protocol
Secure Sockets Layer Certificates
Use Private Networks and VPNs
Explanation:
any two substances whih are tasteless
Answer:
Taste comes from the stimulation of chemical receptors in nerve cells on the tongue by particular chemical structures of substances. If there are no chemical structures pertaining to any of the chemical sensors, the substance would appear to be tasteless. All of these chemicals interact with the sensors with the help of the medium of saliva which has a lot of water. For example: the salt sensors might be susceptible to ions and the sweet sensors might be susceptible to hydroxyl groups on the sugars.
Now, taste is not a very precise field of study. A same substance may taste subtly different to different people. Can we be sure that water has no taste? The chemical sensors are always exposed to water. It might be that there are no sensors for water. It might also be that the signal for water is negated as a background signal. If water did have a particular taste, one thing is for certain, we would be tasting water in every bite of food and even at times when we are not eating as we always have saliva in your mouth.
Hope this helps, have a wonderful day/night, and stay safe!
Compound A reacts with Compound B to form only one product, Compound C, and it's known the usual percent yield of C in this reaction is 72.%. Suppose 3.5g of A are reacted with excess Compound B, and 6.5g of Compound C are successfully isolated at the end of the reaction.
A. What was the theoretical vield of C?
B. How much B was consumed by the reaction?
Answer:
A. Theoretical yield of C is 9.03 g
B. Mass of B consumed is 5.53 g
Explanation:
A. Determination of the theoretical yield of C.
Actual yield of C = 6.5 g
Percentage yield of C = 72.%
Theoretical yield of C =?
Percentage yield = Actual yield /Theoretical yield × 100
72% = 6.5 / Theoretical yield
72 / 100 = 6.5 / Theoretical yield
Cross multiply
72 × Theoretical yield = 100 × 6.5
72 × Theoretical yield = 650
Divide both side by 72
Theoretical yield = 650 / 72
Theoretical yield = 9.03 g
Therefore, the theoretical yield of C is 9.03 g
B. Determination of the mass of B consumed.
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
A + B —> C
Mass of A = 3.5 g
Mass of C = 9.03 g
Mass of B =?
A + B = C
3.5 + B = 9.03
Collect like terms
B = 9.03 – 3.5
B = 5.53 g
Thus, the mass of B consumed in the reaction is 5.53 g
In order to heat a round bottom flask in a heating mantle, plug the heating mantle into _______.Turn the heat up _________, and do not exceed _______ of the maximum output of the device.
Answer:
A Variac or Powermite; gradually; 50-60%.
Explanation:
A chemical reaction can be defined as a chemical process which typically involves the transformation or rearrangement of the atomic, ionic or molecular structure of an element through the breakdown and formation of chemical bonds to produce a new compound or substance.
Some of the laboratory apparatus (equipment) used for conducting a chemical reaction are conical flask, Bunsen burner, beaker, tongs, crucible, round bottom flask etc.
In order to heat a round bottom flask in a heating mantle, plug the heating mantle into a Variac or Powermite which is typically used for controlling the level of temperature. Turn the heat up gradually, and do not exceed 50-60% of the maximum output of the device, so as to avoid any electrical issues such as overloading, short-circuit etc.
The safety precautions that must be taken when using a round bottom flask are;
I. A proper inspection of the round bottom flask for cracks, irregularities or any imperfection.
II. Ensure you avoid heating the flask while it is closed.
III. When suspending the round bottom flask on a stand, you should ensure that you use a clamp for stability.

Someone unscramble the first mystery element because I don’t know how to.
-unnecessary comments will be reported
Answer:
Calcium
Explanation:
The symbol for the element with a mass number of 27 is actually Al for Aluminum instead of Co for Cobalt. Mass number refers to atomic mass, not atomic number.
Aluminum has an atomic mass of 26.982 or 27.
The letters to unscramble are I, M, C, Al, U, and C.
The mystery element is Calcium.
Hope that helps.
How many moles are in 2.5 g of N2?
0.089 moles
KD 0.18 moles
1.3 moles
11 moles
Answer:
0.089
Explanation:
2.5/ 14= .178 then 0.178/ 2 again and you get 0.089
The moles of nitrogen in 2.5 grams of the compound is 0.089 moles. Thus option A is correct.
Moles can be calculated as the ratio of mass to molecular mass.
Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]
The mass of Nitrogen = 14 g/mol
The mass of diatomic nitrogen = 2 [tex]\times[/tex] mass of nitrogen
The mass of diatomic nitrogen = 2 [tex]\times[/tex] 14 g/mol
The mass of diatomic nitogen = 28 g/mol
The molecular weight of Nitrogen = 28g/mol
Given, the mass of Nitrogen = 2.5 g
Moles of nitrogen = [tex]\rm \dfrac{2.5}{28}[/tex]
Moles of Nitrogen = 0.089 moles.
The moles of nitrogen in 2.5 grams of the compound is 0.089 moles. Thus option A is correct.
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An ionic compound contains 2 potassium cations for every 1 oxygen anion. What is the chemical formula of the compound?
Answer:
Chemical formula of the compound = K₂O
Explanation:
Given:
Number of potassium cation = 2
Number of oxygen anion = 1
Cross valency
Symbol of potassium = k
Symbol of oxygen = o
So;
Chemical formula of the compound = K₂O
What is the kinetic energy of a ball when it stops moving?
Question 2 options:
3
2
1
Answer:0
Explanation:
What type of reaction is displayed below?
B12 + 2KI → 2KBr + 12
synthesis
В
decomposition
с
single replacement
double replacement
Answer:
double replacement
Explanation:
The reaction shown is a double replacement reaction.
It is also known as double decomposition or metathesis reaction.
In such a reaction, there is an actual exchange of partners to form new compounds.
One of the following is the driving force for such reaction:
formation of an insoluble compound or precipitateformation of water or any other non-ionizing compoundliberation of a gaseous product.The density of toluene (C7H8) is 0.867 g/mL, and the density of thiophene (C4H4S) is 1.065 g/mL. A solution is made by dissolving 8.10 g of thiophene in 250.0 mL of toluene.
(a) Calculate the mole fraction of thiophene in the solution.
(b) Calculate the molality of thiophene in the solution.
(c) Assuming that the volumes of the solute and solvent are additive, what is the molarity of thiophene in the solution?
Considering the solution of mole fraction, molality and molarity, you obtain that:
(a) the mole fraction of thiophene in the solution is 0.039.
(b) the molality of thiophene in the solution 0.4429 [tex]\frac{moles}{kg}[/tex].
(c) the molarity of thiophene in the solution is 0.373[tex]\frac{moles}{L}[/tex].
You know that:
Density toluene (C₇H₈)= 0.867 [tex]\frac{g}{mL}[/tex]Density thiophene (C₄H₄S)= 1.065 [tex]\frac{g}{mL}[/tex] Volume of toluene (C₇H₈)= 250 mL= 0.250 L (being 1000 mL= 1 L)Mass of thiophene (C₄H₄S)= 8.10 grams(a) Mole fractionThe molar fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution.
Being the molar mass of each compound equals to:
Toluene (C₇H₈)= 92 [tex]\frac{g}{mol}[/tex]Thiophene (C₄H₄S)= 84 [tex]\frac{g}{mol}[/tex]the number of moles of each compound can be calculated as:
Toluene (C₇H₈)= [tex]250 mLx\frac{0.867 grams}{1 mL} x \frac{1 mole}{92 grams}[/tex]= 2.35 molesThiophene (C₄H₄S)= [tex]8.10 gramsx\frac{1 mole}{84 grams}[/tex]= 0.096 molesThe total moles is obtained from the addition of the moles of the solute (C₄H₄S) and the solvent (C₇H₈):
total moles = moles C₄H₄S + moles C₇H₈ = 0.096 moles + 2.35 moles = 2.45 moles
Then, the mole fraction of thiophene in the solution can be calculated as:
[tex]mole fraction of thiophene=\frac{0.096 moles}{2.45 moles}[/tex]
Solving:
mole fraction of thiophene= 0.039
Finally, the mole fraction of thiophene in the solution is 0.039.
(b) MolalityMolality is the ratio of the number of moles of any dissolved solute to kilograms of solvent.
The Molality of a solution is determined by the expression:
[tex]Molality=\frac{number of moles of solute}{kilograms of solvent}[/tex]
In this case, you know:
number of moles of solute (C₄H₄S)= 0.096 moles Mass of solvent = [tex]250 mLx\frac{0.867 grams}{1 mL}[/tex] = 216.75 g = 0.21675 kg (being 1000 g=1 kg)Replacing:
[tex]Molality C_{4} H_{4}S =\frac{0.096 moles}{0.21675 kg}[/tex]
molality C₄H₄S= 0.4429 [tex]\frac{moles}{kg}[/tex]
Finally, the molality of thiophene in the solution 0.4429 [tex]\frac{moles}{kg}[/tex].
(c) MolarityMolarity is the number of moles of solute that are dissolved in a certain volume and is determined by the following expression:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Assuming that the volumes of solute and solvent are additive, you can add the volume of C₄H₄S and C₇H₈.
But first, you need yo know the volume of C₄H₄S, which can be calculated from the mass and density:
[tex]Volume C_{4} H_{4}S =8.10 grams\frac{1 mL}{1.065 grams}[/tex]= 7.606 mL= 0.007606 L
Then, the total volume of the solution is calculated as:
total volume of the solution= volume C₇H₈ + volume C₄H₄S
total volume of the solution= 0.250 L + 0.007606 L = 0.257606 L
So, the molarity of thiophene in the solution can be calculated as:
[tex]Molarity C_{4} H_{4} S=\frac{number of moles of C_{4} H_{4} S}{totalvolumeof the solution}[/tex]
Replacing:
[tex]Molarity C_{4} H_{4} S=\frac{0.096 moles}{0.257606 L}[/tex]
Solving:
Molarity C₄H₄S= 0.373 [tex]\frac{moles}{L}[/tex]
Finally, the molarity of thiophene in the solution is 0.373[tex]\frac{moles}{L}[/tex].
In summary, you get:
(a) the mole fraction of thiophene in the solution is 0.039.
(b) the molality of thiophene in the solution 0.4429 [tex]\frac{moles}{kg}[/tex].
(c) the molarity of thiophene in the solution is 0.373[tex]\frac{moles}{L}[/tex].
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density: brainly.com/question/952755?referrer=searchResults brainly.com/question/1462554?referrer=searchResults mole fraction: brainly.com/question/14434096?referrer=searchResults brainly.com/question/10095502?referrer=searchResults molality brainly.com/question/20366625?referrer=searchResults brainly.com/question/4580605?referrer=searchResults molarity with this example: brainly.com/question/15406534?referrer=searchResultsHow many parents does asexual reproduction involve?
Answer:
only 1 parent is needed! and the offspring is a identical copy of the parent
What is the definition of an atmosphere? a portion of the electromagnetic spectrum that makes the sky look blue the blanket of gases that surrounds Earth and some other planets an area above Earth that scatters sunlight into all colors of the rainbow
Answer:
the blanket of gases that surrounds Earth and some other planets
Explanation:
The best definition of the atmosphere is that it is a portion of the earth that is a made up of a blanket of gases.
The atmosphere is not peculiar to the earth alone, some other planets also have atmospheric cover. The earth's atmosphere is divided into many different layers. The weather we see and experience on the earth surface is conditioned within the troposphere. This troposphere is the closest layer to the surface.How do atoms form double or triple covalent bonds?
Answer:
Covalent bonding occurs when electrons are shared between atoms. Double and triple covalent bonds occur when four or six electrons are shared between two atoms, and they are indicated in Lewis structures by drawing two or three lines connecting one atom to another.
Explanation:
A student puts some sugar in a glass of water and stirs until the sugar is dissolved.
Why is sugar dissolving in water an example of a physical change?
O because the sugar and water are both clear
B. because the sugar gives off gas bubbles when it is dissolved in the water
O c because the student started with sugar and water, and ended with sugar and water
O D. because the sugar and water molecules break apart, and then recombine in different ways
Answer:
It does not change the identity of a substance. Sugar if dissolved in water is still sugar.
Explanation:
What happens to the number of protons in a cation?
Answer:
number of protons is more than the number of electrons.
Explanation:
A cation is a positively charged ion.
An ion is an atom that has lost or gained electron(s). In an ion, the number of protons and electrons are not the same.
Number of protons is the number of positively charged particles
Number of electrons is the number of negatively charged particles.
For a cation, which is positively charged, the number of protons is more than the number of electrons.
Therefore, in cations, we have more protons than electrons.
Shivani measures out 6.0 moles of epsom salt (MgSO) to put her bath. How many grams MgSO4 went in the bath?
Answer: 720 g
Explanation:
To solve this we must be knowing each and every concept related to mole. Therefore, shivani measures out 6.0 moles of epsom salt (MgSO[tex]_4[/tex]) to put her bath. 1,566g MgSO[tex]_4[/tex] went in the bath.
What is mole?A mole is merely a measuring unit. In reality, it is one of its International System of Units' seven foundation units. When current units are insufficient, new units are created.
Chemical reactions frequently occur at levels where employing grams would be inappropriate, but using absolute quantities of atoms/molecules/ions would also be misleading.
For all practical reasons, one mole of a substance in grams is nearly equal to 1 molecule for the compound per daltons.
Mathematically,
number of mole =given mass ÷ molar mass
number of mole=6.0 moles
molar mass of epsom= 261.47g/mol
substituting all the given values in the above equation, we get
6.0 moles =mass of epsom ÷ 261.47g/mol
mass of epsom =1,566g
Therefore, 1,566g MgSO[tex]_4[/tex] went in the bath.
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A control. during a experiment
A scientific control is an experiment or observation designed to minimize the effects of variables other than the independent variable. This increases the reliability of the results, often through a comparison between control measurements and the other measurements.
A canister containing air has a volume of 85 cm3 and a pressure of 1.45 atm when the tenoerature is 310 k. What is the pressure when the volune is increased to 180 cm3 and the temeprarje is reduced to 280 k?
Answer:
Pressure = 0.62 atm
Explanation:
[tex]V_{1}[/tex] = 85 [tex]cm^{3}[/tex], [tex]P_{1}[/tex] = 1.45 atm, [tex]T_{1}[/tex] = 310 K, [tex]V_{2}[/tex] = 180 [tex]cm^{3}[/tex], [tex]T_{2}[/tex] = 280 K.
Applying the general gas law,
[tex]\frac{P_{1} V_{1} }{T_{1} }[/tex] = [tex]\frac{P_{2} V_{2} }{T_{2} }[/tex]
[tex]\frac{1.45*85}{310}[/tex] = [tex]\frac{P_{2}*180 }{280}[/tex]
[tex]P_{2}[/tex] = [tex]\frac{1.45*85*280}{180*310}[/tex]
= [tex]\frac{34510}{55800}[/tex]
= 0.62
[tex]P_{2}[/tex] = 0.62 atm
The pressure when the volume is increased and the temperature reduced to the given values is 0.62 atm.
describe the difference between a physical and chemical change explain what happens during a checmical reaction
Explanation:
A physical change is a change that alters the physical properties of matter particularly the form and state.
In many cases the change is easily reversible. Examples are changes of state such as freezing, boiling, melting e.t.c
A chemical change is a change in which a new kind of matter is formed. It is always accompanied by energy changes which can either be evolution or absorption of heat or light or both.
The process is not easily reversible. Examples are combustion, rusting of iron, precipitation, e.t.c
During a chemical reaction, the reactants undergo a chemical change.
Elements on the periodic table are arranged?
Answer:
In atomic number
And size
And nature of each (metal, non, or metalloide)
[tex]\Large \boxed{\sf by \ their \ properties}[/tex]
Every element has a set of particular characteristics. Each has a unique atomic and mass number because they contain a different ratio of protons and neutrons. The number of protons in an element mirrors the element's atomic number. The mass number equals the sum of the element's protons and neutrons.
According to increasing atomic numbers, chemical elements get organized. Periods and groups are the names of the horizontal rows and vertical columns, respectively. The chemical characteristics of elements within the same group are comparable due to their similar valency and number of outer electrons.
How many moles are in the following:
7.36 x 1024 of free Oxygen atoms
Answer: 12.2 moles
Explanation:
7.36x10^24/6.02214076x10^23 = 12.2 moles of free oxygen atoms
True or false: potential energy increases as like charges get closer to one another
What is the percent composition by mass of sulfur in Na2SO4
Answer:
22.6%
Explanation:
I just answered and got it right
If the theoretical yield of a reaction was calculated to be 39.2 grams and when the experiment was conducted the amount produced was 12.7 grams, the what is the percent yield of the experiment?
Answer:
32.4%
Explanation:
%Yield = Actual Yield/Theoretical Yield x 100% = (12.7/39.2)100% = 32.4%