Answer:
Many things could of prevented the Chernobyl tragedy. Such as better staff training. If the Soviet government had learned from the lessons of the past and if they had not been so averse to spending money.
Explanation:
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Describe how you would make 6.0 L of a 0.100 M KCl solution from a 4.0 M stock KCl solution.
Answer:
0.15 l of 4.0 m stock KCl solution should betaken
Explanation:
N1V1=N2V2
6*0.1=V2*4
V2=0.15L
The overall equation for the electrolysis of aluminium oxide is:
2Al2O3
4Al + 302
Calculate the mass of oxygen produced when 2000 kg of aluminium oxide is
completely electrolysed.
Relative atomic masses (A):
O = 16
Al = 27
941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.
What is electrolysis?Electrolysis is the process by which electric current is passed through a substance to effect a chemical change.
The mass of aluminium oxide Al₂O₃ = 2000 kg = 2000 000 g
Molar mass of Al₂O₃ = 101.96 g/mol
no of moles = [tex]\frac{mass }{ molar \;mass}[/tex]
no of moles of Al₂O₃ = [tex]\frac{2000 000 g}{101.96 g/mol}[/tex]
no of moles of Al₂O₃ = 19615.4 mol
From the reaction:
4Al + 3O₂ ⇒ Al₂O₃
To determine the moles of O₂ in Al₂O₃:
Then;
19615.4 mol X [tex]\frac{3}{2}[/tex] mol of O₂ = 29423.1
The mass of oxygen now = 29423.1 × 32 g
= 941539.2 g
Hence, 941539.2 g of mass of oxygen is produced when 2000 kg of aluminium oxide is completely electrolysed.
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Determine the energy released per kilogram of fuel used. given mev per reaction, calculate energy in joules per kilogram of reactants. consider 1 mole of tritium plus 1 mole of deuterium to be a mole of "reactions" (total molar mass = 5 grams).
The energy released in nuclear reactions are far larger than that released in chemical reactions due to the release of nuclear energy from the nucleus.
Why is the energy released in a reaction?Energy is released in a reaction due to the breaking of bonds are well as formation of bonds.
The quantity of energy released in reactions differs according to the reaction type involved.
When compared to chemical reactions, the energy released in nuclear reactions are very much higher because of the changes that occurs in the nucleus of the atoms involving nuclear energy.
The energy, E released in nuclear reactions is given by the formula below:
[tex]E = mc^{2}[/tex]
where m is the mass of the substance and c is the speed of light.
Therefore, the energy released in nuclear reactions are far larger than that released in chemical reactions.
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Answer:
3.39 x 1014 J/Kg
Explanation:
What are some downsides to fossil fuels? (Select all that apply.) pls help im timed
They are expensive to extract compared to other forms of energy.
They release large amounts of carbon dioxide when burned.
They do not replenish themselves.
They are in a limited supply.
Answer:
B, C and D
Explanation:
Fossil fuels include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils. When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.
Although fossil fuels are continually formed by natural processes, they are classified as non-renewable resources because they take millions of years to form.
fossil fuels, are called nonrenewable, which means they have a limited supply and are not continuously being made or they are made very slowly
How many different consitutional isomers are there for a compound having the molecular formula C3H6O
Answer:
that make 11 isomers....
Which of these solutions is the most basic?
Your answer:
[OH-] = 4.3 x 10-9 M
[OH-] = 2.8 x 10-11 M
[OH-] = 6.7 x 10-10 M
[OH-] = 1.0 x 10-5 M
Which of these solutions is the most basic?
[OH-] = 4.3 x 10-9 M
[OH-] = 2.8 x 10-11 M
[OH-] = 6.7 x 10-10 M
[OH-] = 1.0 x 10-5 M
Answer↷[OH-] = 1.0 x 10-5 M ✓ Solution↷[OH-] = 4.3 x 10-9 M
[OH-] = 4.3 x 10^-9 MpOH = - log [OH^1-]pOH = - log [4.3 x 10^-9]pOH = 8.36pH = 14- 8.36pH = 5.64_______________________________________
[OH-] = 2.8 x 10-11 M
[OH-] = 2.8 x 10^-11 MpOH = - log [OH^1-]pOH = - log [2.8 x 10^-11 ]pOH = 10.55pH = 14-10.55pH = 3.45_______________________________________
[OH-] = 6.7 x 10-10 M
[OH-] = 6.7 x 10^-10 MpOH = - log [OH^1-]pOH = - log [6.7 x 10^-10]pOH = 9.17pH = 14-9.17pH = 4.83_______________________________________
[OH-] = 1.0 x 10-5 M
[OH-] = 1.0 x 10-5 M pOH = - log [OH^1-]pOH = - log [1.0 x 10^-5 ]pOH = 5pH = 14-5pH = 9_______________________________________
we know that , the solution with pH > 7 is termed as basic and more the pH ,more the basicity, hence ,the solution with the highest pH would be the strongest base out of these all which is
[OH-] = 1.0 x 10-5 M with pH = 9
_______________________________________
Note the rule
pOH=-log[OH-]And we can find the answer through logarithm rules basic
loga^b=blogaSo
-log10^-n=nHigher the n higher the pOH
But
pH=14-pOHLesses pOH=Higher pH i.e basic HighAs we can see
Option D has least n (5)
Hence D is more basic
what are the ways to manage wastes.
Explanation:
1. Measure your waste
It is easier to manage and track your improvement on something that is measured. Start by recording the types and quantities of waste materials generated within your business.
This could just be a quick visual assessment and estimation of amount and types of waste per week. As you change how you manage your waste, you can compare and see what difference your changes make to the amount of waste disposed to landfill.
2. Reduce
To reduce the amount of waste going to landfill, consider:
can waste be avoided or reduced by the way you procure goods and services or by changing your business operations?
does another local business have a use for the waste materials produced by your business?
what materials can be targeted for recycling?
3. Recycle
Find out what options are available locally for business recycling.
4. Collection services
It is a good idea to find out how levy fees will be managed by your waste service provider, and find out more about your waste collection services—how it impacts your ability to recycle and what options are available to you.
5. Separating waste
It’s important to ensure that waste is correctly separated for recycling. Putting the wrong waste in contaminates the recycling. Check out the free-to-download recycling signage to help businesses communicate correct recycling and waste separation behaviours.
Atoms with certain characteristics are radioactive. Which of those below will
always be radioactive?
A. all atoms with more neutrons than protons
B. all atoms with an atomic number under 83
C. all atoms with fewer neutrons than protons
D. all atoms with an atomic number over 83
Is a pearl a mineral? Explain your answer thoroughly. Read the description in the reference image to help you determine the answer.
HELP!! IM SO BAD AT SCIENCE!! PLEASE ANSWER AS SOON AS POSSIBLE
Answer:
A pearl is not a mineral
Explanation:
Even though a pearl is made up of a few little overlapping platelets of certain minerals such as aragonite, which is the stable form of calcium carbonate which is a necessary component for sealife. Why is a pearl not a mineral though? Yes a pearl is made up of mineral compounds, but its organic origins take away its ability to be included as a mineral. Pearls do not have distinctive crystal structures and are formed by living organisms.
Answer ASAP! Will award brainleist if correct!!
Let's see
M1V1=M2V21x=15(2)1x=30x=30mlOption D
freshwater is distributed in both time and space
Describe the trends in atomic radii by checking the correct box. atomic radii from the left to right across a period tend to: increase. decrease. atomic radii from the top to the bottom of a group tend to: increase. decrease.
Answer:
1st is decrease
2nd increase
Explanation:
I just did it
Answer:
1. Decrease 2. Increase
Explanation:
Edge 2023
Which of the following describes a characteristic of water that helps it in dissolving a wide range of chemicals and biomolecules? (5 points)
It has a partial negative charge on oxygen and a partial positive charge on hydrogen.
It has a linear molecular structure with H-O-H arranged in a straight line.
It requires a high amount of heat to raise or drop its temperature.
It has completely non-polarized O-H bonds.
¤ As water has the ability to form hydrogen bonds which makes it an excellent solvent.
¤ For this ability of water it can dissolve many different kinds of molecules.
Hope it helpsExplain the relationship by between society and the Technologies of using earths resources
Answer:
We used coal for electricity, water for steam engines when we used them, natural fossil fuels for gasoline and oil and we use earths oxygen/nitrogen gases to breathe
Explanation:
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What aspect of water makes it favorable to use in steam distillation?.
Answer:
The low molecular weight of water makes water a favorable liquid for steaming
For a given voltaic cell, you double the concentrations of all soluble components to 2.0 M instead of the standard 1.0 M. All other conditions are standard. What happens to the cell emf
If the concentration of the solutions are doubled then the cell EMF is also doubled.
Nernst equationAccording to the Nernst equation, the concentration of the species determines the cell EMF as we can see form the formula;
Ecell = E°cell - 0.0592/nlogQ.
Hence, if the concentration of the solutions are doubled then the cell EMF is also doubled.
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Aqueous potassium chloride will react with which one of the following to form a precipitation reaction?
copper (II) nitrate
sodium chromate
ammonium phosphate
lead (II) chlorate
Answer:
lead (II) chlorate
Explanation:
precipitate means not soluble in water
potassium chlorate is not very soluble in water, it precipitates and may be collected by filtration
lead(II) chloride can be made as a white precipitate by adding a solution containing chloride ions to lead(II) nitrate solution
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P32 is a radioactive isotope with a half-life of 14.3 days. If you currently have 17.5 g of P32 , how much P32 was present 9.00 days ago
Answer:
27.07 gm nine days ago
Explanation:
17.5 = x (1/2)^9/14.3
x = 27.07 gm
The volume of a gas collected when the temperature is 11. 0°c and the pressure is 710 mm hg measures 14. 8 ml. What is the calculated volume of the gas at 20. 0°c and 740 mm hg?.
Answer:
Original: P₁ = 710 mmHg, V₁ = 14.8 mL, T₁ = (273.2 + 11.0) K = 284.2 K
New: P₂ = 370 mmHg, V₂ = ? mL, T₂ = (273.2 + 20.0) K = 293.2 K
Combined gas law: P₁V₁/T₁ = P₂V₂/T₂
Then, V₂ = V₁ × (P₁/P₂) × (T₂/T₁)
Calculated new volume, V₂ = (14.8 mL) × (710/370) × (293.2/284.2) = 29.3 mL
Plan an investigation to explore the evidence that an electric current produces a magnetic field, and that a changing magnetic field produces an electric current.
Answer:
Give evidence for the existence of a magnetic field near a current carrying wire. If you hold a compass near a wire through which current is flowing, the needle on the compass will be deflected.
~cosmic snowball ~orbits our Sun ~frozen gases, rock and dust ~may have brought water to Earth ~dust and gases form a tail that stretches away from the Sun The prompt above is describing what celestial body?
Answer:
A comet
Explanation:
Comets travel so fats through the solar system that they melt which give them their glowy tail
Equation Unbalanced : __AlCl3 + __F2 --> __AlF3 + __Cl2
When 4.00g of flourine reacts with excess aluminum chloride, how many grams of chlorine gas are produced? First balance the equation.
[tex]\\ \rm\Rrightarrow 2AlCl_3+3F_2\longrightarrow 2AlF_3+3Cl_2[/tex]
Balanced3mols of fluorine produce 2 mol chlorine
1 mol fluorine produces 2/3=0.6mol chlorine
Moles of fluorine gas=
4/190.2mol.approxMoles of chlorine:-
0.2(0.6)=0.18molMass of chlorine
71(0.18)12.78gWhen liquid bromine is cooled to form a solid, which of the following types of solid would it form?.
Answer:
If liquid bromine is cooled to form a solid, which type of solid does it form? Brass is made by melting copper and zinc and physically mixing them. As this alloy is cooled, it forms a solid where the copper and zinc are not chemically bonded together.
Explanation:
What are the spectator ions in the
following reaction?
NiS (s) + 2HCl(aq)
NiCl₂(aq) + H₂S(g)
B
S²-
CIT
Answer:
S
Explanation:
Match the molecules below with their functions:
Answer:
MAC: Assembly of the MAC leads to pores that disrupt the cell membrane of target cells, leading to cell lysis and death
Interferons: Stimulates the infected cells and those nearby to produce proteins that prevent the virus from replicating within them
Cytokines: Molecular messengers between cells
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A beaker filled with freshwater has a p h balance of 6.65. geraldo wants to model the effect of acids on the ph of water for a group of students. which pollutant should geraldo add to the water? what will the ph reading be after geraldo adds the pollutant?
Geraldo can add a pollutant with slightly basic nature so he will have a solution of neutral pH of 7.
What is pH?The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution.
The pH of 6.5 means that the solution is acidic.
By adding a pollutant which is slightly basic in nature, Geraldo will have a solution of neutral pH which is a pH of 7.
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Answer:
1.pesticide
2.less than 6.65
Explanation:
A sample of radon gas has a volume of 1.53 L, a pressure of 1.15 atm, and a temperature of 305 K. What is the new pressure if the new volume is 1.78 and the new temperature is 325 K
Answer: 0.813 L
Explanation:
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of helium gas is 5.63 atm.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of radon gas
V= volume of radon gas
n =number of moles of radon gas
T =temperature of radon gas
R = Gas constant = 0.0821 L.atm/K.mol
Combining Boyle's and Charles' gas law
P₁V₁/T₁ = P₂V₂/T₂
{ (1.15 atm) (1.53 L)} ÷305 K ={ (P2) ( 1.78)} ÷325 K
P2 = 7.55÷1.34 = 5.63 atm
Therefore the new pressure of radon gas is 5.63 atm when the temperature is changed to 325K and volume is decreased to 1.78liter.
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A sample of oxygen occupies a volume of 250. liters at 375 K. Predict the volume of the sample, when the temperature drops to 280. K with constant pressure.
A. 164 L
B. 187 L
C. 223 L
D. 352 L
Answer:
187 L
Explanation:
its the correct answer on smartsparrow.
When the limiting reactant in a chemical reaction is completely used, the.
Answer:
The limiting reagent is the reactant that is used up completely. This stops the reaction and no further products are made. Given the balanced chemical equation that describes the reaction, there are several ways to identify the limiting reagent.Explanation:
What is the solvent for a solution made by dissolving sodium chloride into water?
O water
o sodium chloride
O chloride
O sodium
it is water because it is dissolving the sodium chloride