Answer:
1s2 2s2 2p6
Explanation:
ththe noble gas config. of neon
how many moles are in 23.8 g of sulfur dioxide
Answer:
0.371
Explanation:
number of moles = mass / Ar
= 23.8g / 32.1 + (16.0 × 2)
= 0.37129485179 = 0.371 (3 s.f).
hope it helps :)
Substance A reacts spontaneously with substance B at room temperature. Substance A reacts with substance C at room temperature only in the presence of a catalyst. Which statement best explains this difference?
Between A and B
The reaction is spontaneousMeans reaction is happening by itself.So randomness of A and B is increasing .The highest probability is that A and B are solids and they are forming liquid or gases.
Between A and C
The reaction is non spontaneousRandomness of particles is decreasing.Highest probability is that A and C are gases and they are turning into liquid or solid
Identify the atom below.
a.) H
b.) He
c.) Bе
d.) С
Answer:
B. Helium
Explanation:
Correct me if I'm wrong
) If 35.0 mL of 1.50 M solution is diluted to 100. mL, what is the concentration of the dilute solution
Answer:
0.53 (sig figs) or 0.525 original answer
Explanation:
If you use the formula (M1)(V2)=(M2)(V2) and plug in the values, you are solving for the missing X, which is the concentration.
Hi hope you all are doing well
Answer:
yesss
Explanation:
hehhehehhehe
A 5. 00 l container contains ch4, h2, and xe at 35°c with a total pressure of 1. 81 atm. If there are equal moles of each gas, what is the partial pressure of h2?
If there are equal moles of each gas, what is the partial pressure of H₂ is 0.362.
What is partial pressure?The pressure that one of the gases in a mixture would exert if it were in the same volume on its own.
According to the Dalton's law of partial pressure
The Partial pressure of a gas = (Total pressure × mole fraction of the particular gas)
Partial pressure of H₂ is
[tex]\dfrac{1.81}{5.00} = 0.362[/tex]
Thus, the partial pressure of H₂ is 0.362.
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In the product 6o2, what does the coefficient mean?.
Answer:
It means there are 6 O2 molecules
Explanation:
How to calculate delta g for autoionization of water
The Delta G for the autoionization of water can be calculated as [tex]\Delta G=-RTlnK[/tex].
What is the autoionization of water?The autoionization of water is given as the reaction of the two water molecules, resulting in the formation of the ions of hydronium and hydroxide ion.
It can be expressed as:
[tex]\rm 2\;H_2O\;\leftrightharpoons\;H_3O^+\;+\;OH^-[/tex]
The[tex]\Delta G[/tex] of the autoionization of water can be given as;
[tex]\Delta G=-RTlnK[/tex]
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Write the ionization equation and the ka expression for aqueous formic acid. What is the name of the anion that forms?
Ionization reaction gives the ionization state of the chemical species. Its ionization will result in a conjugate base of the formic acid and release a hydrogen ion.
What is the acid dissociation constant?The acid dissociation constant is the concentration of the acid that has been dissociated into its constituents ions in the solution.
The ionization equation of the formic acid is:
[tex]\rm HCOOH \rightleftharpoons HCOO^{-} + H^{+}[/tex]
The acid dissociation constant (Ka) for formic acid is given as,
[tex]\rm Ka = \rm \dfrac {[H^{+}][HCOO^{-}]}{[HCOOH]}[/tex]
Anions are negatively charged ions and formate ions generated in the dissociation of the formic acid.
Therefore, the formate ion is an anion.
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H2504 has a pH of 1. How many times more acidic is it compared to the chemical
above?
HELPPP
calculate the number of particles of 285 grams of Al2O3
The number of particles of 285 grams of aluminum oxide (Al2O3) is 1.68 x 10²⁴ particles.
Number of moles of the Al2O3The number of moles of the given aluminum oxide is calculated as follows;
Al2O3 = 101.96 g/mol
moles = 285/101.96
moles = 2.795 moles
1 mole = 6.02 x 10²³ particles
2.795 moles = ?
= 2.795 x 6.02 x 10²³ particles
= 1.68 x 10²⁴ particles.
Thus, the number of particles of 285 grams of aluminum oxide (Al2O3) is 1.68 x 10²⁴ particles.
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30 ml of. 150 m cacl2 is added to a 15 ml of. 100 m agno3
The mass of the formed precipitate of AgCl in the reaction is 1.29 grams.
How do we find moles from molarity?Moles (n) of any substance from molarity (M) will be calculated by using the below equation:
M = n/V, where
V = volume in L
Given chemical reaction is:
2AgNO₃(aq) + CaCl₂(aq) → 2AgCl(s) + Ca(NO₃)₂(aq)
From the stoichiometry of the reaction, mole ratio of AgNO₃ to CaCl₂ is 2:1.
0.0015 moles of AgNO₃ = reacts with 1/2×0.0045 = 0.00075 moles of CaCl₂
Here CaCl₂ is the limiting reagent, and formation of precipitate depends on this only.
Again from the stoichiometry of the reaction:
0.0045 moles of CaCl₂ = produces 2(0.0045) = 0.009 moles of AgCl
Mass of 0.009 moles AgCl will be calculated as:
n = W/M, where
W = required massM = molar mass = 143.45 g/molW = (0.009)(143.45) = 1.29g
Hence required mass of precipitate is 1.29 grams.
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Concentration required to begin precipitate pbcl2 for pbcl2 ksp=1. 17×10−5
The concentration required to begin to precipitate PbCl2 for PbCl2 is 0.0216 M.
What is molarity?
Molarity is the measure of the concentration of any solute in per unit volume of the solution.
The reaction is [tex]\rm Pb^2^+(aq) + 2Cl^-(aq) \rightarrow PbCl_2(s).[/tex]
The molarity of lead is 0.025 M
The ksp is given 17×10⁻⁵
Now, calculating the concentration
[tex][Pb^2^+] = 0.025 M.\\Ksp = 1.17 \times 10^-^5\\Ksp = [Pb^2^+] \times [Cl^-]^2\\[Cl^-] = \dfrac{\sqrt{ Ksp}}{[Pb^2^+]} \\\\[Cl^-] = \dfrac{\sqrt{ 0.0000117}}{0.025} \\[Cl^-] = 2.16 \times 10^-^2M.[/tex]
Thus, the concentration required to begin to precipitate PbCl2 for PbCl2 is 0.0216 M.
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Classify each chemical compound as ionic or molecular:
1. MnP ionic or molecular?
2. AIOH3 ionic or molecular?
3. C3S2 ionic or molecular?
The following is a classification of the compounds;
MnP - ionicAIOH3 - ionic C3S2 - molecularWhat is an ionic substance?The term ionic substance refers to a substance that is composed of ions. It is a substance that can dissolve in water.
The following is a classification of the compounds;
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determine the next term in the geometric sequence. 1/2, 1/3, 2/9,4/27
Geometric progression is a sequence that can be found by multiplying the same value by the preceding number. The next term in the sequence is 8 / 81.
What is geometric progression?A geometric progression is a sequence of numbers other than 0 and can be estimated by multiplying a specific digit by the prior number. It is given as,
an = a₁rⁿ⁻¹
Where r is the common ratio or the number.
For the given sequence the common ratio (r) is 2/3.
Substituting values:
an = (1/2) × (2/3)ⁿ⁻¹
Applying r:
an=2ⁿ⁻¹ / 2 × 3ⁿ⁻¹
Substitute n to find the nth term as:
a₅=2⁽⁵⁾⁻²/ 3⁽⁵⁾⁻¹
a₅=8/ 3⁽⁵⁾⁻¹
a₅ = 8/ 81
Therefore, the next number on the sequence is 8/81.
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A gas that has a volume of 22.8 L, a temperature of 42 degrees Celsius (!!), and an
unknown pressure has its volume increased to 37 L and its temperature decreased to
29 degrees Celsius (!!). If I measure the pressure after the change to be 1.69 atm,
what was the original pressure of the gas?
Calculate number of moles in 2.71 g of CCl4
what is the formula of the T method
Answer:
T = (Z x 10) + 50
Explanation:
How to tell which acid whill have the hightest perceent ionization
We can tell which acid which have the highest percent ionization on the basis of pH value.
What is percent ionization?The % ionized indicates how much of the original chemical has ionized. As a result, we compare the ion concentration in solution to the neutral species' original concentration.
If any acid have a high pH value then they must show high percent ionization because they are strong in nature and show full dissociation.
Hence acids with high pH value will show highest percent ionization.
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1: Why are scientific observations important?
Every experiment uses qualitative observations.
Every experiment ends with observations.
Every experiment begins with observations.
Every experiment uses quantitative observations.
2:
What is one way in which a field investigation can differ from a classroom or laboratory experiment?
In field investigations, it is much more difficult to separate your control and experimental groups.
In field investigations, you are usually working with much larger animals than in the lab.
In field investigations, you are always working with microscopic organisms.
In field investigations, it is much easier to separate your control and experimental groups.
3: Qualitative observations are ______.
based on your senses
measurable
often taken using instruments
only made by scientists in a laboratory
4: Which observation is quantitative?
The flower has five petals.
The flower has a thin stem.
The flower is purple.
The flower is tall.
5: Which statements are true about observations? (Select all that apply.)
Lab experiments rely on observations, but field investigations do not.
We naturally make observations about the world around us.
They are statements made based on something seen, noticed, or measured.
Observations are only made in a laboratory setting.
According to the research, scientific observations are important because every experiment begins with observations.
What are observations?It consists of receiving knowledge of the outside world through our senses, it means that we naturally make observations about the world around us and the first step proposed by the scientific method.
Scientific observation, on the other hand, refers to the process of detailing any phenomenon of nature with analytical intent, usually later replicated in a laboratory (experimentation) or controlled environment.
Similarly, there are qualitative observations that are based on the senses, which are generally more subjective, while quantitative observations are more objective, focusing mainly on numbers, for example "the flower has five petals" is a quantitative observation.
Therefore, we can conclude that according to the context, scientific observations are important because every experiment begins with observations.
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Answer:
1. Every experiment begins with observations
2.In field investigations, it is much more difficult to separate your control and experimental groups.
3.based on your senses
4.The flower has five petals.
5.We naturally make observations about the world around us.
They are statements made based on something seen, noticed, or measured. (I think 5 is wrong, if it is then sorry guys dont report me, i tried my best.)
Explanation:
Write the chemical equation for the follow- ing: "carbon plus oxygen produces carbon dioxide." Label the parts of the equation.
If a neutral sodium atom has one electron removed, what is the result?
Answer: When this atom loses an electron, the result is a positive ion.
Explanation:
Calculate the pH of a 1.4 x 10-4 M solution of HCI.
Answer:
Here is the solution....hope it helps :)
Calcualting molar stability of aucl3 0/010 m mgcl2 solution
The molar solubility of AuCl₃ in 0.010M MgCl₂ is 4 ×10⁻²⁰M.
What is Ksp?The solubility product constant, Ksp, is the equilibrium constant for a solid substance dissolving in an aqueous solution. And for the AuCl₃ Ksp will be written as: Ksp = [Au³⁺][Cl⁻]³
AuCl₃(aq) ⇄ Au³⁺(aq) + 3Cl⁻(aq)
Let the solubility of the AuCl₃ in 0.013m solution of magnesium chloride is x, of Au³⁺ is x and of Cl⁻ is 3x. But we know that MgCl₂ is a strong electrolyte and it completely dissociates into its ion and will produce 2 moles of chloride ions. For this solution let we consider the volume is 1 litre then the concentration of chloride ions in MgCl₂ is 2(0.010) = 0.020M.
So, in MgCl₂ solution concentration of Cl⁻ becomes = 3x + 0.020.
Value of Ksp for AuCl₃ = 3.2 × 10⁻²⁵
On putting all values on the Ksp equation, we get
Ksp = (x)(3x + 0.020)³
Value of 3x is negligible as compared to the 0.020, so the equation becomes
3.2 × 10⁻²⁵ = (x)(0.020)³
x = 3.2×10⁻²⁵ / (0.020)³
x = 4 ×10⁻²⁰M
Hence the molar solubility of AuCl₃ in 0.010M MgCl₂ is 4 ×10⁻²⁰M.
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If 15. 1 ml of the barium hydroxide solution was needed to neutralize a 2. 22 ml aliquot of the perchloric acid solution, what is the concentration of the acid?
The concentration of the 2.22 mL perchloric acid that was neutralized with barium hydroxide is 3.1 M.
What is neutralization?The neutralization is given as the reaction of the acid and the base forming salt. The reaction of 1 mole of barium hydroxide requires 2 moles of perchloric acid to neutralize completely.
The volume of barium hydroxide given was 15.1 mL. The moles of barium hydroxide has been:
[tex]\rm 1000\;mL\; Ba(OH)_2 = 0.2288 \;mol Ba(OH)_2\\\\15.1\;mL\;Ba(OH)_2=0.0034\;mol[/tex]
The moles of perchloric neutralized by 0.0034 mol barium hydroxide will be:
[tex]\rm 1\;mol\;Ba(OH)_2=2\;mol\;HClO_4\\\\\rm 0.0034\;mol\;Ba(OH)_4=0.0069\;mol\;HClO_4[/tex]
The volume of perchloric has been 2.22 mL. The concentration of the acid is given as:
[tex]\rm Concentration=moles\;\times\dfrac{1000}{volume(mL)}\\\\Concentration=0.0069\;mol\;\times\dfrac{1000}{2.22}\\\\Concentration=3.1\;M[/tex]
The concentration of the perchloric acid aliquot is 3.1 M.
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NEED THIS ASAP PLEASE HELP
Which of these is an example of a physical change?
A. a banana ripening in the air
B. hydrogen burning in the air
C. zinc reacting with an acid
D. liquid water turning into vapor
Answer:
A
Explanation:
Banana ripening in air is an example of oxidation reaction.
If a compound has an empirical formula of znco3 and a molecular mass of 500g/mol, what would be the molecular formula?
A sample of hydrogen is collected in a flask over water. The partial pressures are 789 mmHg for H₂
and 60 mmHg for H₂O. What is the total pressure exerted by the mixture of gasses?
The total pressure of the gas is calculated as 849 mmHg.
What is partial pressure?The term partial pressure is the pressure that is exerted by an individual gas in a mixture of gases.
In this case, the partial pressures of hydrogen and water are 789 mmHg and 60 mmHg respectively.
Thus, the total pressure of the gas = 60 mmHg + 789 mmHg = 849 mmHg.
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What is the name of rover that was just sent to Mars in March of 2021?
A.Spirit
B.Curiosity
C.Opportunity
D.Perseverance
Nitrate reduction test consider the uninoculated tube. A. Is it a positive or negative control?
The nitrate reduction test with the uninoculated tube considers it a positive control.
What is a nitrate reduction assay?The nitrate reduction assay is given as the assay with the ability of the bacteria or enzyme to reduce nitrate to nitrite.
The test is performed by considering the difference in the inoculated and the uninoculated tubes with bacteria. The tube with the bacteria and the nitrate is termed a test tube.
The tube with nitrate only without bacteria is termed as a negative control, as it will not have the results for the reduction and can be used to assess the test.
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