Answer:
[H+] = 10^-2
Explanation:
pH = -log[H+]
2 = -log[H+]
[H+] = 10^-2
Give the Shorthand Electron Configuration for the following elements:
Nickel
Group of answer choices
[Kr] 3d8 4s2
[Ne] 3d6 4s2
[Ar] 3d8 4s2
answer of this question is [Ar]3d8 4s2
Answer: [Ar] 3d8 4s2
Explanation: Wikipedia
What is the molar mass of 4.23 g of an elemental gas in a 2.5L container at 282K and 1.4 atm?
Answer:
27.98g/mol
Explanation:
Using ideal gas law equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
T = temperature (K)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
According to the information given:
V = 2.5L
P = 1.4 atm
T = 282K
n = ?
Using PV = nRT
n = PV/RT
n = 1.4 × 2.5/0.0821 × 282
n = 3.5/23.1522
n = 0.151mol
Using the formula to calculate molar mass of the elemental gas:
mole = mass/molar mass
Molar mass = mass/mole
Molar mass = 4.23g ÷ 0.151mol
Molar mass = 27.98g/mol
Name one common base that is NOT harmful to the body when ingested AND a product, or way, in which it is used.
Answer:
well when you eat some food you will get many tastes mixed with base and acid but salt from NA2CO3 can be a base if it is contained with weak acid.
Explanation:
Basically SALT can be one common base that is NOT harmful to the body when ingested AND a product, or way, in which it is used.
Magnesium hydroxide (Mg(OH)2) is not harmful to our body when ingested AND a product, or way, in which it is used. It is commonly used to get relief from acidity, that is caused when our stomach releases excessive acid. It neutrelises the acid and gives us relief. It is also called Milk of Magnesia commonly.
I
Gggggggggggggsgstststsysgtetwtwtst
Answer:
ummm u ok?
Explanation:
What is the equation for the reaction between ethanoic acid and butanol in the presence of H2SO4?
Answer:
[tex]CH_3COOH+CH_3CH_2CH_2CH_2OH\rightarrow CH_3COOCH_2CH_2CH_2CH_3+H_2O[/tex]
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to realize this is a question about esterification, process whereby a carboxylic acid and an alcohol react to produce water an an ester, we can set it up as shown below:
[tex]CH_3COOH+CH_3CH_2CH_2CH_2OH[/tex]
For the reaction between ethanoic acid and butanol; and therefore, the products side is:
[tex]CH_3COOCH_2CH_2CH_2CH_3+H_2O[/tex]
It means that the overall equation is:
[tex]CH_3COOH+CH_3CH_2CH_2CH_2OH\rightarrow CH_3COOCH_2CH_2CH_2CH_3+H_2O[/tex]
And the ester product is butyl ethanoate.
Regards!
In this image, which fundamental interaction is responsible for attracting the electron?
a. electromagnetism
b. nuclear weak force
c. gravitation
d. nuclear strong force
Answer:
a.
Explanation:
electromagnetism
What are the IUPAC name?
Answer:
IUPAC
Explanation:
International Union of Pure and Applied Chemistry
Which of the following has the greatest mass for one mole of the compound?
A. SIHA
B. CO
C. CH3OH
D. C2H6
The concept molar mass is used here to determine the compound which has the greatest mass for its one mole. The correct option is C.
What is molar mass?The molar mass also defined as the molecular weight of a compound is generally the sum of the atomic masses of each atoms present in the given compound. Its unit is g mol⁻¹.
The mass of 1 mole of any substance is also called the molar mass. Evidently molar mass is equal to the atomic mass or the molecular mass denoted in grams depending upon whether the substance contains atoms or molecules.
Here (SiHA) is known as the most important bioceramic which is used in the field of bioactive bone implants. The compound CO is carbon monoxide, CH₃OH is methanol and C₂H₆ is ethane.
The molar mass of the given compounds are obtained by adding their atomic masses :
CO = (12.011 g/mol+ 15.999 g/mol) = 28.01 g/mol
CH₃OH = (12.011 g/mol + 3 × 1.007 g/mol + 15.999 g/mol + 1.007 g/mol) = 32.04 g/mol
C₂H₆ = (2 × 12.011 g/mol + 6 × 1.007 g/mol) = 30.07 g/mol
Here among the given compounds CH₃OH has the greatest mass for one mole of the compound.
Thus the correct option is C - CH₃OH.
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(i)What happens when an aqueous solution of sodium sulphate reacts with an aqueous
solution of barium chloride ? (i) Write the balanced chemical equation for the reaction which takes place.(ii) Name the type of chemical reaction which occurs. Define.
Explanation:
2nacl+baso4
the orginal equation is
Na2so4+Bacl2
then na react with cl and ba react with so4
HELP HELP HELP
NH3 + NO + N2 + H2O
5. Given 8.25 x 1025molecules of ammonia, determine the number of grams of
nitrogen produced.
Answer:
4NH3+6NO+5N2+6H20
Explanation:
match the following
Of scinece chapter
In the titration, 15 mL of CsOH solution is neutralized by 38.2 mL of 0.250 M HBr solution. What is the molarity of the CsOH solution?
Answer: 0.637M
10.2M
1.36M
0.0982M
Explanation: the answer is 1.36M
The molarity of the CsOH solution is 0.636 M.
What is molarity?Molarity is the concentration of any substance in a place.
The reaction is
HBr + CsOH —> CsBr + H₂O
The formula of molarity
[tex]M = \dfrac{n}{V}[/tex]
[tex]\dfrac{0.25 \times 38.2 }{15} = 0.6366[/tex]
Thus, the molarity of the CsOH solution is 0.636 M.
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Which of the following statements about the pH of 0.010 M HClO4 is correct?
pH=2.00, because [H+]=1.0×10−2M.
A: p H equals 2.00 , because the molar concentration of H with a positive 1 charge equals 1.0 times 10 to the negative 2 power molar .
pH=2.00, because [H+]=2.0×10−2M.
B: p H equals 2.00 , because the molar concentration of H with a positive 1 charge equals 1.0 times 10 to the negative 2 power molar .
pH>2.00, because HClO4 is a strong acid.
C: p H is greater than 2.00 , because H C l O 4 is a strong acid.
pH<2.00, because HClO4 is a weak acid.
Answer:
Option B: p H equals 2.00 , because the molar concentration of H with a positive 1 charge equals 1.0 times 10 to the negative 2 power molar .
pH = 2 because [H⁺] = 1×10¯² M
Explanation:
To know which option is correct, we shall determine the pH of the 0.010 M HClO₄ solution. This can be obtained as follow:
We'll begin by calculating the concentration of the hydrogen ion [H⁺] in the solution. This is illustrated below:
HClO₄ is a strong acid and will dessociates as follow:
HClO₄ (aq) —> H⁺ (aq) + ClO₄¯ (aq)
From the balanced equation above,
1 mole of HClO₄ produced 1 mole H⁺.
Therefore, 0.010 M HClO₄ will also produce 0.010 M H⁺.
Finally we shall determine the pH of the solution. This can be obtained as follow:
Concentration of the hydrogen ion [H⁺] = 0.010 = 1×10¯² M
pH =?
pH = –Log [H⁺]
pH = –Log 1×10¯²
pH = 2
Thus,
The pH = 2
because,
[H⁺] = 1×10¯² M
Thus, option B gives the correct answer to the question.
Based on the definition of pH, pH of 0.010 M solution of HClO4 equals 2.00, because the molar concentration of H with a positive 1 charge equals 1.0 times 10 to the negative 2 power molar.
What is pH?The pH of a solution is the negative logarithm of the hydrogen ion concentration of a solution.
pH of a solution is a measure of the acidity of the solution.
pH = - log[H+]where
[H+] is hydrogen ion concentrationFor the 0.010 M solution of HClO4, [H+} = 0.01 M
pH = -log(0.01)
pH = 2.00
Therefore, pH of 0.010 M solution of HClO4 equals 2.00, because the molar concentration of H with a positive 1 charge equals 1.0 times 10 to the negative 2 power molar.
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A 0.457-M aqueous solution of (CH3)2NH (dimethylamine) has a pH of 12.2. Calculate the pH of a buffer solution that is 0.457 M in (CH3)2NH and 0.280 M in (CH3)2NH2 .
Answer:
pH = 10.95
Explanation:
To solve this question we must, as first, find pKb of dimethylamine. Then, using H-H equation we can solve the pH of the buffer:
pKb dimethylamine:
Based on the equilibrium:
(CH3)2NH(aq) + H2O(l) ⇄ (CH3)2NH2⁺(aq) + OH-(aq)
Kb is defined as:
Kb = [OH-] [(CH3)2NH2⁺] / [(CH3)2NH]
Both (CH3)2NH2⁺(aq) + OH- comes from the same equilibrium, that means:
[OH-] = [(CH3)2NH2⁺]
And: [(CH3)2NH] = 0.457M
[OH-] can be obtained from pH as follows:
14 -pH = pOH
14-12.2 = 1.8 =pOH
10^-pOH = [OH-] = 0.01585M
Replacing:
Kb = [0.01585M] [(0.01585M] / [0.457M]
Kb = 5.50x10⁻⁴
pKb = -logkb = 3.26
pH of the buffer:
Using H-H equation for bases:
pOH = pKb + log [conjugate acid] / [weak base]
pOH = 3.26 + log [0.280M] / [0.457M]
pOH = 3.05
pH = 14 - pOH
pH = 10.95What is a metal oxide + acid
Metal oxide + acid —> __+__
Answer:
Metal oxide + acid —> salt + water
Explanation:
Which statement describes the law of conservation of energy? A. All systems will exchange matter and energy with their surroundings. B. All systems can exchange energy, but not matter, with their surroundings. C. Energy cannot be created nor destroyed, but it changes from one form to another. D. Energy is destroyed in most chemical reactions when new products are formed.
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Answer:
C, energy cannot be created nor destroyed.
Explanation:
How many grams of chlorine are required in order to consume 100g of sodium chloride?
Answer:
92.1 g
Explanation:
Answer: 92.1 grams
I hope this helped :3
what is the definition of isomerism
Answer:
Isomerism is the phenomenon in which more than one compounds have the same chemical formula but different chemical structures. Chemical compounds that have identical chemical formulae but differ in properties and the arrangement of atoms in the molecule are called isomers. Therefore, the compounds that exhibit isomerism are known as isomers.
The word “isomer” is derived from the Greek words “isos” and “meros”, which mean “equal parts”. This term was coined by the Swedish chemist Jacob Berzelius in the year 1830.
Explanation:
Hypothetical element A has three stable isotopes. The first isotope has a mass of 35.01 amu and an abundance of 35.00%. The second isotope has a mass of 36.01 amu and an abundance of 15.00%. The third isotope has a mass of 37.02 amu and an abundance of 50.00%. What is the atomic mass of element A
Answer:
36.16 amu
Explanation:
From the question given above, the following data were obtained:
1st Isotope:
Mass of 1st isotope = 35.01 amu
Abundance of 1st isotope = 35%
2nd isotope:
Mass of 2nd isotope = 36.01 amu
Abundance of 2nd isotope = 15%
3rd isotope:
Mass of 3rd isotope = 37.02 amu
Abundance of 3rd isotope = 50%
Atomic mass of element A =?
The atomic mass of element A can be obtained as follow:
Atomic mass = [(mass of 1st × Abundance)/100] + [(mass of 2nd × Abundance)/100] + [(mass of 3rd × Abundance)/100]
= [(35.01 × 35)/100] + [(36.01 × 15)/100] + [(37.02 × 50)/100]
= 12.25 + 5.40 + 18.51
= 36.16 amu
Thus, the atomic mass of element A is 36.16 amu
When the pressure and number of particles of a gas are constant, which of the following is also constant
Please hurry!!! And help!!
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Why is elemental zinc considered a pure substance
A) it is a metal
B) it is a mixture of different atoms
C) it must be created in a lab
D) all elements are considered pure substances
Answer:
D
Explanation:
Answer:
D
Explanation:
Because it is true
ch3cooh number of bonding pairs and lone pairs.
Answer:
whats the question?
Explanation:
34. Which statement describes what occurs in the
following redox reaction?
Cu(s) + 2Ag (aq) → Cu2+ (aq) + 2Ag(s)
(1) Only mass is conserved.
(2) Only charge is conserved.
3 Both mass and charge are conserved.
(4) Neither mass nor charge is conserved.
Answer:
3 Both mass and charge are conserved.
Explanation:
The equation of the reaction is;
Cu(s) + 2Ag+ (aq) → Cu2+ (aq) + 2Ag(s)
A redox reaction is an acronym for oxidation-reduction reaction. This refers to a reaction in which the oxidation number of one specie is increased while the oxidation number of the other specie is decreased.
This means that one specie looses electrons while the other specie gains electrons. Here, Cu(s) looses electrons while Ag+(aq) gains electrons from left to right in the reaction.
In a redox reaction, both mass and charge are conserved. This means that the total mass and charge on the reactants side is the same as the total mass and charge on the products side.
Helpppp pleaseee ill give brainliest
Answer:
The answers are in the explanation.
Explanation:
The energy required to convert 10g of ice at -10°C to water vapor at 120°C is obtained per stages as follows:
Increasing temperature of ice from -10°C - 0°C:
Q = S*ΔT*m
Q is energy, S specific heat of ice = 2.06J/g°C, ΔT is change in temperature = 0°C - -10°C = 10°C and m is mass of ice = 10g
Q = 2.06J/g°C*10°C*10g
Q = 206J
Change from solid to liquid:
The heat of fusion of water is 333.55J/g. That means 1g of ice requires 333.55J to be converted in liquid. 10g requires:
Q = 333.55J/g*10g
Q = 3335.5J
Increasing temperature of liquid water from 0°C - 100°C:
Q = S*ΔT*m
Q is energy, S specific heat of ice = 4.18J/g°C, ΔT is change in temperature = 100°C - 0°C = 100°C and m is mass of water = 10g
Q = 4.18J/g°C*100°C*10g
Q = 4180J
Change from liquid to gas:
The heat of vaporization of water is 2260J/g. That means 1g of liquid water requires 2260J to be converted in gas. 10g requires:
Q = 2260J/g*10g
Q = 22600J
Increasing temperature of gas water from 100°C - 120°C:
Q = S*ΔT*m
Q is energy, S specific heat of gaseous water = 1.87J/g°C, ΔT is change in temperature = 20°C and m is mass of water = 10g
Q = 1.87J/g°C*20°C*10g
Q = 374J
Total Energy:
206J + 3335.5 J + 4180J + 22600J + 374J =
30695.5J =
30.7kJ
A 2.00 L flask is filled with propane gas (C3H8) at a pressure of 1.10 atm and a temperature of 258 K. What is the mass of propane in the flask?
Answer:
m = 4.58 g.
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to realize this problem is solved via the ideal gas equation:
[tex]PV=nRT[/tex]
As we can calculate the moles of propane given the pressure, temperature and volume as shown below:
[tex]n=\frac{PV}{RT} \\\\n=\frac{1.10atm*2.00L}{0.08206\frac{atm*L}{mol*K}*258K} \\\\n=0.104mol[/tex]
Finally, since the molar mass of propane is 44.1 g/mol, we calculate the mass by following the shown below mole-mass conversion factor:
[tex]m=0.104mol*\frac{44.1g}{1mol}\\\\m= 4.58g[/tex]
Regards!
HEEELP! What are some examples of nuclear fusion? Select all the correct answers.
A: Being the power source of stars
B: Forming heavier elements from light elements
C: Generating electricity in power plants
D: Being used in thermonuclear weapons
E: Supplying the power source in nuclear submarines
Answer:
A B D
Explanation:
Answer: A: Being the power source of stars
B: Forming heavier elements from light elements
D: Being used in thermonuclear weapons
Explanation: (Edmentum)
from E=mc²=hv show that wavelength=h/mv
Explanation:
To show - from E=mc²=hv show that wavelength=h/mv
Proof -
Given that,
E = mc²
E = hν
By equating both the equations, we get
mc² = hν
Because real particles do not travel at the speed of light, De Broglie submitted velocity ( v ) for the speed of light ( c ).
mv² = hν
Through the equation λ , de Broglie substituted v/λ for ν and arrived at the final expression that relates wavelength and particle with speed.
mv² = hv/λ
⇒λ = hv/mv²
⇒λ = h/mv
Hence showed.
Describe the process of making 1.0 L of a 0.03 M solution of cobalt (II) chloride from the solid state. Be sure to include all instrumentation and glassware.
Answer:
By measuring out 3.9 grams of cobalt (II) chloride up to a volume of 1.0 L of solution.
Explanation:
Hello there!
In this case, considering this question about molarity, it turns out possible for us to calculate the required mass of cobalt (II) chloride by firstly compute the moles present in 1.0L of the given 0.03-M solution:
[tex]M=\frac{n}{V} \\n=V*M\\\\n=1.0L*0.03\frac{molCoCl_2}{L}\\\\n=0.03molCoCl_2[/tex]
Next, since the molar mass of cobalt (II) chloride is 129.84 g/mol, we compute the grams we need to measure out in order to prepare this solution:
[tex]m_{CoCl_2}=0.03molCoCl_2*\frac{129.84gCoCl_2}{1molCoCl_2} \\\\m_{CoCl_2}=3.9gCoCl_2[/tex]
Regards!
Assume a substance X has a body centered cubic lattice. The edge length is 379.0 pm. The atomic mass of X is 195.0 amu What is the density of Xin g/cc
Answer:
[tex]\rho=12g/cm^3[/tex]
Explanation:
From the question we are told that:
Length[tex]l=379.0pm=>379*10^{-10}cm[/tex]
Atomic mass of X [tex]M= 195.0 amu=>gmol^{-1}[/tex]
Where
[tex]Avogadro\ constant = 6.023 * 10^{23} mol-1[/tex]
Let
The Number of units in BCC unit cell [tex]n= 2[/tex]
Generally the equation for Density is mathematically given by
[tex]\rho= \frac{M x n}{l^3*Avogadro constant}[/tex]
[tex]\rho=\frac{197 x 2}{(379*10^{-10})^3*6.023 x 10^{23}}[/tex]
[tex]\rho=12g/cm^3[/tex]
Therefore he density of Xin g/cc
[tex]\rho=12g/cm^3[/tex]
In the reaction below does water acts as the acid or as the base?
H2S + H20 - HS1- + H30+ *
O a. Neither, water is neutral
O b. Acid
O C. Base
Answer:
C. Base.
Explanation:
Hello there!
In this case, according to the given information, it turns out convenient for us to realize that the concept acid and base we should use here is based off the Bronsted-Lowry one, which says that an acid is a hydrogen donor. In such a way, since water accepts one H ion as it goes to H3O⁺, we infer it is C. Base and the H2S the acid.
Also, we can tell HS⁻ is the conjugate base and H3O⁺ the conjugate acid.
Regards!