Answer:
1.12 litersExplanation:
Calculating number of moles
Molar mass of O₂ = 32 gn = Given weight / Molar massn = 1.6/32n = 0.05 molesAt STP
One mole of O₂ occupies 22.4 LTherefore, 0.05 moles will occupy :22.4 L x 0.05 = 1.12 L1mol of any gas at STP contains 22.4L
moles of O_2
Given mass/molar mass1.6/320.05molNow
Volume of O_2:-
0.05(22.4)1.120LOption D
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
thoughtcocom chemguidecouk
What is the active element in most photovoltaic cells?.
Answer:
if you mutliply 8x2 it would be 16 and half of 16 is 8 and if you multiply that by 2 you get 16 again and then if you multiply that by 2 it comes out to 32 then devide that by 2 and you get 16 then divide again and you get 8
Explanation:
Answer:
silicon is the most common semiconductor used in computer chips
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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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)12.78gWhich of the following will lose 2 electrons to become stable?
Answer:
Magnesium,Berillium,
Explanation:
they they belong to group II
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
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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Can someone please help me?
D. Petroleum
Answer:
Water and plastic
Explanation:
The other two dont make as much sense
What is the mass of 0.5 moles of carbon tetraflouride
Answer:
44 g
Explanation:
hope this helps
How can professionals increase their levels of stress as a result of personal work habits?
Working at a steady rate
Developing work ethics
Procrastinating
Setting personal goals
Answer:
A
Explanation:
Developing work ethics won't lower your stress although it may make your conscience a little happier. Not B
Not C. Procrastinating just makes things harder. The mountain of things to do is not diminishing at all and your stress knows it.
Not D. Although D is the second best answer, setting goals is not really an action. It is a plan for how to work. But it is not work. Still having a goal is useful.
The answer is A. Just keep hitting what you have to do at a steady pace.
what is the molar mass of sodium chloride
Answer:
58.44 g/mol
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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 helpsP32 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
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
what two types of ions do oysters need to form shells
The two highest levels of the atmosphere contain only small amounts of oxygen, nitrogen, and ozone. These layers are the
Answer:
mesosphere and thermosphere
Explanation:
Under which conditions the temperature and pressure is a gas most soluble and water
We know
[tex]\\ \rm\Rrightarrow S\propto T[/tex]
Higher the temperature higher the solubilityAccording to gay lussac's law
[tex]\\ \rm\Rrightarrow P\propto T[/tex]
If temperature is high pressure is also highSo our answer is high pressure and high temperature
100 points help is appreciated
Apply: For a strong base, the concentration of hydroxide ions [OH–] is roughly estimated to be the same as the concentration of the base. The pH of a strong base is found with the equation pH = 14 + log10[OH–]. Based on their concentrations, find the pH of each of the strong bases. Check your answers with the Gizmo.
Answer
[Ca(OH)2] = ?
pH Ca(OH)2 = ?
[NaOH] = ?
pH NaOH = ?
Litmus is an example of an indicator, a substance that changes color depending on its pH (pH is a measure of the concentration of protons, or H+ ions). In the Titration Gizmo™, you will use indicators to show how acids are neutralized by bases, and vice versa.
To begin, check that 1.00 M NaOH is selected for the Burette, Mystery HBr is selected for the Flask, and Bromthymol blue is selected for the Indicator.
Calculate: Concentration is measured by molarity (M), or moles per liter. Brackets are also used to symbolize molarity. For example, if 0.6 moles of HNO3 are dissolved in a liter of water, you would say [HNO3] = 0.6 M.
Because HNO3 is a strong acid, it dissociates almost completely in water. That means the concentration of H+ is very nearly equal to that of HNO3.What is [H+] if [HNO3] is 0.01 M? 0.01 M
The pH of a solution is equal to the negative log of H+ concentration: pH = –log[H+]
Describe: The equation for the reaction of nitric acid (HNO3) and sodium hydroxide (NaOH) is shown on the bottom right of the Gizmo.
Measure: A titration can be used to determine the concentration of an acid or base by measuring the amount of a solution with a known concentration, called the titrant, which reacts completely with a solution of unknown concentration, called the analyte. The point at which this occurs is called the equivalence point.
Explain: A titration curve is a graph of pH vs. volume of titrant. The graph at right shows a typical titration curve for the titration of a strong acid by a strong base. (A strong base is one that has relatively high dissociation in water.)
According to theBrønsted-Lowry definition, an acid is a substance that is capable of donating a proton to another substance. A base is a substance that accepts protons. When an acid and a base are combined, the acid is neutralized as the base accepts the protons produced by the acid.One way to determine if a solution is acidic or basic is to use litmus paper, as shown above. There are two types of litmus papers: red and blue.How does litmus paper indicate an acid? Both strips turn red.
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
A 45.3 g sample of potassium nitrate is dissolved in enough water to make
225 mL of solution. Determine the molar concentration of the potassium nitrate.
Answer:
1.99 M
Explanation:
It gives the mass of a compound, KNO3. First, find the gram formula mass of KNO3. You should get 101.102 g/mol, or something very close. Next, divide given mass by g/mol mass to get number of moles. In this case, 45.3/101.102 = .44806, roughly.
Now, since it says molar concentration, it is asking for moles per liter of solution. If it only gives you 225 mL, or .225 L, you have to adjust for that value. Divide the number of moles you have by number of liters.
.44806/.225 = 1.99 M. This isn't the exact answer, but always remember to round for significant figures. Since both numbers contain 3 significant figures, your answer should have 3. Therefore 1.99 is your answer.
Consider the intermolecular forces present in a pure sample of each of the following compounds: CH3CH2CH2NH2 and CH3CH2C02H. Identify the intermolecular forces that these compounds have in common. A) Dipole-dipole forces and hydrogen bonding. B) Dipole-dipole forces only. C) Dispersion forces, dipole-dipole forces, and hydrogen bonding. D) Dispersion forces and dipole-dipole forces
The common intermolecular forces present in the compounds CH3CH2CH2NH2 and CH3CH2C02H are Dispersion forces, dipole-dipole forces, and hydrogen bonding.
What are intermolecular forces?Intermolecular forces are forces of attraction between molecules of the same compound.
Intermolecular forces are important in the physical properties of molecules.
Some intermolecular forces are:
Dipole-dipole forceshydrogen bondingDispersion forcesThe given compounds are contain hydrogen bonding and London dispersion forces as well as dipole-dipole forces.
Therefore, the common intermolecular forces present in the compounds CH3CH2CH2NH2 and CH3CH2C02H are Dispersion forces, dipole-dipole forces, and hydrogen bonding.
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Which of the following liquids would turn
blue litmus paper red?
1. orange juice
2. milk of magnesia
3.
distilled water mixed with a little baking soda
4. oven cleaner
Answer:
orange juice because it a type of acid.
When 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:
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 is an oxidation reaction
Answer:
Oxidation: loss of electrons, gain of oxygen
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:
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
2(NH4)₂Cr₂ What are the names of the atoms make up the above formula?
Answer:
Nitrogen, Hydrogen, Chromium
Explanation:
N= Nitrogen
H= Hydrogen (it is not helium because helium is "He")
Cr= Chromium
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