help pls i give twenty points and brainlist
Answer:
C and B are the correct answers
To determine the concentration of a sodium thiosulfate solution as in this experiment, a student pipetted 25.0 mL of 0.0100 M potassium iodate (KIO3) solution into a 125 mL Erlernmeyer flask. Potassium iodide and sulfuric acid were added as in this experiment. The titration needed 15.21 mL of the sodium thiosulfate to reach the end point. What is the concentration of the sodium thiosulfate solution
Answer:
0.0986M is the concentration of the Na₂S₂O₃ solution
Explanation:
Potassium iodate, KIO₃, reacts with sodium thiosulfate, Na₂S₂O₃, as follows:
KIO₃ + 6Na₂S₂O₃ +5KI + 3H₂SO₄ → 3H₂O + 3K₂SO₄ + 3Na₂S₄O₆ + 6NaI
To solve this question we must find the moles of sodium thiosulfate that reacts as follows:
Moles KIO₃:
0.0250L * (0.0100mol / L) = 2.5x10⁻⁴moles KIO₃
Moles Na₂S₂O₃:
2.5x10⁻⁴moles KIO₃ * (6mol Na₂S₂O₃ / 1mol KIO₃) = 1.5x10⁻³ moles Na₂S₂O₃
Molar concentration:
1.5x10⁻³ moles Na₂S₂O₃ / 0.01521L =
0.0986M is the concentration of the Na₂S₂O₃ solutionA student claims that she cannot identify the exact location of an electron. Which of the following explains if the student's claim is correct or
incorrect? (1 point)
The claim is incorrect because a particle can have a known location at a given time.
The claim is correct because an electron is invisible and cannot be seen.
The claim is correct because we cannot determine the exact location of an electron at a given time.
The claim is incorrect because the exact position of matter is always visible or can be determined.
Answer:
The claim is incorrect because the exact position of matter is always visible or can be determined.
Compare and contrast the way energy can transfer from one object to another.
Answer:
Energy is transferred from the hotter object to the cooler one, and the difference in temperature between them decreases.Explanation
During a titration, the pH of an analyte solution containing HA(aq) is 3.92 and the ratio of [A–]/[HA] is 0.41. What is the Ka of HA?
Answer:
[tex]Ka=4.71x10^{-4}[/tex]
Explanation:
Hello there!
In this case, according to the Henderson-Hasselbach equation, it is possible to write:
[tex]pH=pKa+log(\frac{[A^-]}{[HA]} )[/tex]
Next, since we are given the pH and the [A–]/[HA] ratio, we can solve for the pKa as shown below:
[tex]pKa=pH-log(\frac{[A^-]}{[HA]} )[/tex]
Now, we plug in the values to obtain:
[tex]pKa=3.92-log(0.41 )\\\\pKa=3.33[/tex]
Next, Ka is:
[tex]Ka=10^{-pKa}=10^{-3.33}\\\\Ka=4.71x10^{-4}[/tex]
Best regards!
water
air
multiple cells
a place to live
Answer:
I guess it WATER
A compound has the empirical formula CH20 and a
gram-formula mass of 60. grams per mole. What is the
molecular formula of this compound?
Answer:
The molecular formula of this compound is (2) C2H4O2.
Explanation:
Any help?
The Kb for hydroxylamine, HONH2, is 1.1 x 10 -8
. What would be the pH of a solution
prepared by placing 1.34 g of HONH2 in 0.500 L of water?
Answer:
pH = 9.475
Explanation:
Hello there!
In this case, according to the basic ionization of the hydroxylamine:
[tex]HONH_2+H_2O\rightarrow HONH_3^++OH^-[/tex]
The resulting equilibrium expression would be:
[tex]Kb=\frac{[HONH_3^+][OH^-]}{[HONH_2]} =1.1x10^{-8}[/tex]
Thus, we first need to compute the initial concentration of this base by considering its molar mass (33.03 g/mol):
[tex][HONH_2]_0=\frac{1.34g/(33.03g/mol)}{0.500L} =0.0811M[/tex]
Now, we introduce [tex]x[/tex] as the reaction extent which provides the concentration of the hydroxyl ions to subsequently compute the pOH:
[tex]1.1x10^{-8}=\frac{x^2}{0.0811-x}[/tex]
However, since Kb<<<<1, it is possible to solve for [tex]x[/tex] by easily neglecting it on the bottom to obtain:
[tex]x=[OH^-]=\sqrt{1.1x10^{-8}*0.0811}= 2.99x10^{-5}[/tex]
Thus, the pOH is:
[tex]pOH=-log(2.99x10^{-5})=4.525[/tex]
And the pH:
[tex]pH=14-4.525\\\\pH=9.475[/tex]
Regards!
An __________ includes all living and non-living things in an environment.
Answer:
an ecosystem
Explanation:
it compromises of living and non living things in an environment.
help me with this question?!!
Answer:
Glow sticks and match would be light emission, slime would be preciptate, and cookies would be gas.
Explanation:
aluminium extraction from its ore
150. g of aluminum chloride in 0.450 liters of solution, what is the concentration? (any examples are helpful, thank you)
Answer:
2.49 M
Explanation:
Step 1: Given data
Mass of AlCl₃: 150. gVolume of solution: 0.450 LStep 2: Calculate the moles AlCl₃ (solute)
The molar mass of AlCl₃ is 133.34 g/mol.
150. g × 1 mol/133.34 g = 1.12 mol
Step 3: Calculate the molar concentration of AlCl₃
Molarity is equal to the moles of solute divided by the liters of solution.
M = 1.12 mol/0.450 L = 2.49 M
(giving brainiest)
brainly will ban you if you answer with a wrong absurd answer or copied answer if the question has over 50 points in it!
Answer:
Mars and jupiter
Explanation:
Similarities
-both circle the sun
-both have atmospheres
- both have moons
Differences
-mars is red and rocky
-jupiter is the largest planet
-mars is most like our earth
- jupiter has rings
explanation of crystallization and it's diagram
Answer:
Crystallization or crystallisation is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.
When a nonmetal gains electrons, it becomes this type of ion.
Answer:
When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions. Most nonmetals become anions when they make ionic compounds. A neutral chlorine atom has seven electrons in its outermost shell.
Explanation:
Hope this helps!
The distances from large bodies of water will affect the average rainfall of an area. (Example: Florida has more rain than Nevada) *10 points
A. True
B. False
Answer:
A
Explanation:
7.) Regarding molecular formula and empirical formula for a particular compound... (A) the subscripts in the empirical formula must be greater than or equal to those of the molecular to (B) the subscripts in the empirical formula must be less than or equal to those of the molecular form (C) the subscripts in the empirical formula must always be equal to those of the molecular formula (D) the subscripts in the empirical formula must be less than or greater than those of the molecular.
Answer:
Explanation:
i think the anwer would be that its elliptical orbit and the tilt an its axis.
What is the ionic charge for the lead ion in PbS2?
Answer:
[tex]\boxed {\boxed {\sf +4}}[/tex]
Explanation:
Lead (Pb) has 2 positive oxidation states, +4 and +2.
Sulfur (S) has 3 oxidation states: +6, +4, and -2. Since lead creates a positive ion, sulfur must be a negative ion to balance the charges.
There are 2 atoms of sulfur, each with a charge of -2. Therefore, their overall charge is -4, because 2* -2= -4.
A compound has a net charge of 0. To achieve this, lead must have a charge of +4 to balance out the -4 charge of sulfur.
Lead has a +4 ionic charge in PbS₂
an artificial reef is intended to affect the ocean ecosystem by
Answer:
By strengthening the weak coral that is on the reef.
Answer: To encourage plants and animals to set up homes there to increase biodiversity.
Why sucrose gives negative Benedict test?
Answer:
Sucrose contains two sugars (fructose and glucose) joined by their glycosidic bond in such a way as to prevent the glucose isomerizing to aldehyde, or the fructose to α-hydroxy-ketone form. Sucrose is thus a non-reducing sugar, which does not react with Benedict's reagent.
Explanation:
Answer:
Sucrose contains two sugars (fructose and glucose) joined by their glycosidic bond in such a way as to prevent the glucose isomerizing to aldehyde, or the fructose to α-hydroxy-ketone form. Sucrose is thus a non-reducing sugar, which does not react with Benedict's reagent.
Explanation:
please give me brainlist and follow
Guess this song
Okay I was gone for a minute but I'm back down. Sit the F back down
Seem like everybody nowadays Hollywood
Oh it's like that now?
I'ma show you mf how to act now
I'ma show 'em how to act
This is gonna get reported I all ready now XD
Answer:
it is logic: everybody
Explanation:
that's the song
Two different bromide solutions are mixed with each other: Solution 1 is an aqueous solution of 4.85 g aluminum bromidein 150. ml water and solution 2 has a volume of 175 ml and contains 7.75 g of zinc bromide. You mix the two solutions together in a large beaker. What is the bromide concentration in moles/L in the mixture
Answer:
M=0.380 M.
Explanation:
Hello there!
In this case, given those two solutions of aluminum bromide and zinc bromide, it is firstly necessary to compute the moles of bromide ions in each solution as shown below:
[tex]n_{Br^-}^{in\ AlBr_3}=4.85 gAlBr_3*\frac{1molAlBr_3}{266.69gAlBr_3}*\frac{3molBr^-}{1molAlBr_3} =0.05456molBr^-\\\\n_{Br^-}^{in\ ZnBr_2}=7.75gZnBr_2*\frac{1molZnBr_2}{225.22gZnBr_2}*\frac{2molBr^-}{1molZnBr_2} =0.06882molBr^-[/tex]
Now, we compute the total moles of bromide:
[tex]n_{Br^-}=0.05456mol+0.06882mol\\\\n_{Br^-}=0.12338mol[/tex]
Then, the total volume in liters:
[tex]150mL+175mL=325mL*\frac{1L}{1000mL} \\\\=0.325L[/tex]
Therefore, the concentration of total bromide is:
[tex]M=\frac{0.12338mol}{0.325L}\\\\M=0.380M[/tex]
Best regards!
What layer of the Sun is the location for nuclear fusion?
How many particles are in 2 moles of a CuCl2?
Answer:
5
Explanation:
Answer:
5
Explanation:
Match each energy type with the source it uses.
Solar
?
Nuclear reactions
Hydropower
?
Moving water
Geothermal
?
Sun's rays
Biomass
?
Plants
ASAP HELL
The energy exists in many different forms. Each form of energy can be converted or changed into the other forms. The geothermal energy denotes the thermal energy.
What is solar energy?The energy produced from the sun is called the solar energy. The heat and light which come from the sun is the solar energy. The solar energy play an important role in reducing the emissions of green house gases and also control the climate change.
The biomass is known as the fuel obtained from the organic matter waste of the living organisms such as plant waste, animal waste and municipal wastes. It is the fuel developed from plants.
The hydropower is the largest source of renewable energy which uses the moving water to produce electricity. The energy which is generated from the heat within the earth is called the Geothermal energy.
Thus,
Solar - sun's rays
Moving water - Hydropower
Plants - Biomass
Nuclear reactions - Geothermal
To know more about solar energy, visit;
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Covalent bonds are formed between the
two nonmetals
and
The nonmetals will
electrons.
Answer:
Explanation:
A covalent bond is formed between two non-metals that have similar electronegativities. Neither atom is "strong" enough to attract electrons from the other
If the pOH increases is a solution getting more basic or less basic?
Answer:
pH and pOH are related to one another; THEY ARE NOT INDEPENDENT OF EACH OTHER. As pH increases, pOH decreases. As pH decreases, pOH increases. By knowing what ion you are measuring on which scale, this will tell you whether or not the solution is acidic or basic.
Explanation:
So now i don't know if that will get more or less basic. But errr.... Hope this helps!!
If the pOH increases is a solution, the solution is getting less basic and more acidic.
How pOH affects basic nature of solution?We know that when pH increases, pOH decreases. We also know that when pH increases acidity decreases and basic nature of solution increases but in pOH, the sequence is opposite. When pOH increases acidity increases and basic nature of solution decreases.
So we can conclude that If the pOH increases is a solution, the solution is getting less basic and more acidic.
Learn more about basic here: https://brainly.com/question/3948796
name any
three kinds of mixtures with example
Answer:
Here are a few more examples:
Smoke and fog (Smog)
Dirt and water (Mud)
Sand, water and gravel (Cement)
Water and salt (Sea water)
Potassium nitrate, sulfur, and carbon (Gunpowder)
Oxygen and water (Sea foam)
Petroleum, hydrocarbons, and fuel additives (Gasoline)
Heterogeneous mixtures possess different properties and compositions in various parts i.e. the properties are not uniform throughout the mixture.
Examples of Heterogeneous mixtures – air, oil, and water, etc.
Examples of Homogeneous mixtures – alloys, salt, and water, alcohol in water, etc.
Explanation:
Answer:
smog,mud, cement?
Explanation:
Smoke and fog (Smog)
Dirt and water (Mud)
Sand, water and gravel (Cement)
If I write 6 PbCO3, how many PbCO3 do I have?please help me
Answer:
you have 6 pbco3 ok
fgbhh
What is the key difference between a liquid and a gas?
Answer:
What is the key difference between gases and liquids? EZZZZZ. The particles in a liquid are attracted to one another; the particles in a gas *are not attracted *.
Explanation: