Answer:
pH value of HCL = 2.69897
Explanation:
Given:
Concentration of HCL = 0.002 M
Find:
pH value of HCL
Computation:
pH value of HCL = - log(Concentration of HCL)
pH value of HCL = - log(0.002)
pH value of HCL = 2.69897
Bronze is a(n)
A. Alloy
B. Pure substance.
C. Element.
D. Compound.
Answer:....
Explanation:...
Will give brainlist please help
Assignment
Explain why it is not advisable to wear
black silky cloth in the sun
Answer:
It is not water absorbant and also the colour black, due to it's dark nature makes the person wearing the cloth feel hot. Unlike cotton, silk is not at all water absorbant as it does not absord any sweat produced in the wearers body
What effect does
hybridization have on boods,
6. How many sections are there to an SDS for a given chemical? *
(2 Points)
N.
8
10
14
16
Heat of vaporization is the amount of heat required to
A. Evaporate a solid.
B. Evaporate a liquid.
C. Melt a solid.
D. Condense a vapor.
Heat of vaporization is the amount of heat required to melt a solid. Therefore option C is correct.
What is heat of vaporization ?
The amount of energy required to turn a portion of a liquid material into a gas is known as the enthalpy of vaporization, commonly referred to as the heat of vaporization or heat of evaporation. The pressure at which the transition occurs affects the enthalpy of vaporization.
The amount of energy required for one gram of a liquid to evaporate without a change in pressure is known as the heat of vaporization. As the solid or liquid transitions into a less dense state of matter, these energies are required to disperse the intermolecular forces keeping it together.
vaporization is the process by which a material is transformed from its liquid or solid state into its gaseous state. Boiling is the term for the vaporization process when circumstances permit the creation of vapour bubbles within a liquid.
Thus, option C is correct.
To learn more about heat of vaporization follow the link below;
https://brainly.com/question/9967928
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The amount of heat needed to cause a liquid to evaporate is known as the heat of vaporization. So, option B is right.
When a liquid is heated, the molecules at the surface of the liquid gain enough energy to escape from the liquid and become a gas. This process is called evaporation.
The heat of vaporization is the amount of heat that is required to vaporize one gram of a liquid at a constant temperature.
The heat of vaporization is different for different liquids. For example, it takes 2260 joules of heat to vaporize one gram of water at 100 degrees Celsius.
The heat of vaporization is a measure of the strength of the intermolecular forces in a liquid. The stronger the intermolecular forces, the more heat is required to vaporize the liquid.
Therefore, the answer is B, that the heat of vaporization is the amount of heat required to evaporate a liquid.
Learn more about vaporization here;
https://brainly.com/question/30078883
#SPJ6
Phosphorus is implanted into silicon. The implant parameters are a dose of 1015cm-2at an energy of 150keV.a)Find the depth of the peak of the implant profile and its value at that depth.b)If the wafer originally had 1016cm-3of boron uniformly distributed throughout, find the depth(s) at which the concentration of phosphorus is equal to the concentration of boron.
Answer:
a) ≈ 4.99 / cm^3
b) 0.515 um
Explanation:
Given data:
energy = 150 Kev
dose of 10^15 cm^-2
A) find the depth of the peak of the implant profile and its value at that depth
expression for implant profile = written below in the attached file
value of the peak depth ≈ 4.99 / cm^3
B ) determine the depth at which the concentration of phosphorus is equal concentration of boron
= 0.515 um
attached below is the detailed solution to the problem
How many grams of iron can be extracted from 1.55 kg of iron(III) carbonate?
BRAINLIEST WILL BE GIVEN TO BEST ANSWERED!
What is the best explanation for why a magnet is different from a regular piece of metal?
A magnet has more electrons
The magnetic domains in a magnet are lined up with each other
Magnets are made of iron
A magnet has an electric field
Answer:
the second one
Explanation:
metal doesn't act like a magnet because the domains don't have a preferred direction of alignment. Magnets are all aligned in a specific direction.
Which best describes the benefit of fiber in the diet
Answer:
Assist in the movement of food and waste through the digestive system
3.
Question
Many chemical warfare reagents readily convert into reactive 3-membered ring intermediates (although
maybe not the Joker's venom from the Batman comics). In turn, these intermediates can damage DNA by
what type of chemical reaction?
Your answer
O a. Elimination
O b. Sn1
OC. SN2
O d. None of the above
Answer:
I think it's letter B
Explanation:
Hope it helps correct if I'm wrong
Prepare methoxyethane by Williamson's
synthesis method. What happens when methoxyethane is
treated with excess HI?
Suppose you are provided with a 36.89 g sample of potassium chlorate to perform this experiment. What is the mass of oxygen you expect
to release upon heating?
Answer:
14.45 g of O₂.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2KClO₃ —> 2KCl + 3O₂
Next, we shall determine the mass of KClO₃ that decomposed and the mass of O₂ produced from the balanced equation. This can be obtained as follow:
Molar mass of KClO₃ = 39 + 35.5 + (16×3)
= 39 + 35.5 + 48
= 122.5 g/mol
Mass of KClO₃ from the balanced equation = 2 × 122.5 = 245 g
Molar mass of O₂ = 2 ×16 = 32 g/mol
Mass of O₂ from the balanced equation = 3 × 32 = 96 g
SUMMARY:
From the balanced equation above,
245 g of KClO₃ decomposed to produce 96 g of O₂.
Finally, we shall determine the mass of O₂ produced by heating 36.89 g of KClO₃. This can be obtained as follow:
From the balanced equation above,
245 g of KClO₃ decomposed to produce 96 g of O₂.
Therefore, 36.89 g of KClO₃ will decompose to produce =
(36.89 × 96)/245 = 14.45 g of O₂
Thus, 14.45 g of O₂ were obtained from the reaction.
How many moles of phosphorus are in a sample of 40.4 grams of phosphorus I NEED HELP FAST
Answer:
1.30 mol P
Explanation:
take what is given to you (40.4g). now divide it by the molar mass of the asked element (phosphorus = 30.97g/mol)
40.4g P / 30.97g/mol P = 1.30 mol P
hope this helps :)
How many moles of Al will be consumed when 0.400 mol of Al2O3 are produced in
the following equation?
4A1+302 -> 2A1203
A)
0.200 mol
B) 0.400 mol
C) 0.800 mol
D) 0.600 mol
Answer:
C) 0.800 mol
Explanation:
4Al + 3O₂ → 2Al₂O₃In order to convert from moles of Al₂O₃ into moles of Al, we'll need to use the stoichiometric coefficients, using a conversion factor that has Al₂O₃ moles in the denominator and Al moles in the numerator:
0.400 mol Al₂O₃ * [tex]\frac{4molAl}{2molAl_2O_3}[/tex] = 0.800 mol AlSo the correct answer is option C).
How many moles of kclo3 are required to produce 14.3 moles of kcl?
What kinds of matter have thermal energy
Answer:
Thermal energy comes from heat sources that provide energy from it's temp.
Explanation:
Produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy. 6 min, 47 sec Heat Energy.
(If this doesn't help let me know in the comments, I'll try to explain better :> )
HELP ME PLS 20 POINTS
Answer:
1- Se 2-Na 3- I guess Si as well 4-Ar 5-O
Explanation:
Ionization energy increases as we go right in periodIonization energy increases as we go upwards in groupsAtomic radius increases as we go downwards in groupsAtomic radius increases as we go left in periodsAtomic radius decreases as we go right in periods so when atoms loses electron or more the smaller its radius becomesThe effective molar mass of ashes has units of grams of ashes per mole of base provided. The mass of the ashes in the experiment is given, 20.4 g. The rest of the work involves determining the amount of base provided, in moles. We will first determine the moles of base used in the titration. What volume of acid was used in the experiment
Answer:
molar mass of unknown monoprotic acid = 114.1 g / mole.
Explanation:
Note: This question is incomplete and lacks necessary data to solve for the required calculation. However, I have similar question on the internet and seen the question completely and will be using that data to solve for this question in order to solve required calculation. Besides that, complete question asks us to solve for molar mass of the acid used.
Note: I have attached the screenshot of the complete question, please have a look on it in the attachment below.
Calculation:
Volume = 34.81mL
34.81 mL of 0.4346 M potassium hydroxide
= 0.03481 L * 0.4346 mole / L
= 0.01513 mole.
Balance equation:
HA + KOH ----> KA + H2O
As we know from the question,
one mole HA neutralize with 1 mole KOH.
mole of unknown monoprotic acid = 0.01513 mole.
And we know that the formula for mole is:
mole = mass / molar mass
Making molar mass as the subject:
Molar mass = mass / mole
Molar mass = 1.726 g / 0.01513 mole
Molar mass = 114.1 g / mole.
So,
Molar mass of unknown monoprotic acid = 114.1 g / mole.
Which statement correctly explains how objects within our galaxy are organized?
A:The moon- earth system is found within the Sun, which is located in the Milky Way.
B:The moon-earth system, the Sun and Jupiter are a part of a solar system found in the Milky Way, which is located within another galaxy.
C: The Earth and other galaxies are found in our Solar System which is found in the Milky Way.
D: The moon-earth system, the Sun, and Jupiter are a part of a solar system found in the Milky Way.
a'Zorria Ward
An elevator traveled 15 floors (150 ft) at a speed of 4.5 m/s. What additional information is needed to determine the velocity of the elevator?
the direction the elevator traveled
how long the elevator was stationary
O how many times the elevator stopped
O the total mass of the elevator plus anything in it
Explanation:
An elevator traveled 150 ft at a speed of 4.5 m/s. What additional information is needed to determine the velocity of the elevator?
Velocity is vector quantity.So it needs direction in addoition to speed.
The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of its speed and direction of motion.
Text 8.7 Using the virial equation of state for hydrogen at 298 K given in problem 7 (text 8.6), calculate a. The fugacity of hydrogen at 500 atm and 298 K b. The pressure at which they fugacity is twice the pressure c. The change in Gibbs free energy caused by a compression of 1 mole of hydrogen from 1 to 500 atm. What is the magnitude of the contribution to (c) caused by the non ideality of hydrogen
Answer:
a). P = 688 atm
b). P = 1083.04 atm
c).Δ G = 16.188 J/mol
Explanation:
a). Fugacity 'f' can be calculated from the following equations :
[tex]$\ln \frac{f}{P}=\int^P_0\left(\frac{Z-1}{P}\right) dP$[/tex]
where, P = pressure , Z = compressibility
Now, the virial equation is :
[tex]$PV=R(1+6.4\times 10^{-4} P)$[/tex] ........(1)
Also, PV=ZRT for real gases .......(2)
∴ [tex]$ZRT=RT(1+6.4\times 10^{-4} P)$[/tex]
[tex]$Z=1+6.4\times 10^{-4} P$[/tex]
So from the fugacity equation ,
[tex]$\ln \frac{f}{P}=\int^P_0\left(\frac{1+6.4\times 10^{-4}P-1}{P}\right) dP$[/tex]
[tex]$\ln \frac{f}{P}=\int^P_0\left(\frac{6.4\times 10^{-4}P}{P}\right) dP$[/tex]
[tex]$\ln \frac{f}{P} = 6.4 \times 10^{-4} P$[/tex]
[tex]$f=Pe^{6.4 \times 10^{-4} P}$[/tex]
Putting the value of P = 500 atm in the above equation, we get,
f = 688 atm
b). Given f = 2P
[tex]$2P=PE^{6.4 \times 10^{-4}P}$[/tex]
[tex]$2=E^{6.4 \times 10^{-4}P}$[/tex]
[tex]$\ln 2 = 6.4 \times 10^{-4}P$[/tex]
∴ P = 1083.04 atm
c). dG = Vdp -S dt at constant temperature, dT = 0
Therefore, dG = V dp
[tex]$\int^{G_2}_{G_1}dG =\int^{P_2}_{P_1}V dp $[/tex]
[tex]$=\int^{P_2}_{P_1}\frac{RT}{P}\left(1+6.4 \times 10^{-4}P\right) dP$[/tex]
[tex]$=\int^{P_2}_{P_1}RT\frac{dp}{P}+\int^{P_2}_{P_1}RT6.4 \times 10^{-4} dP$[/tex]
[tex]$\Delta G=R[\ln\frac{P_2}{P_1}+6.4 \times 10^{-4}(P_2-P_1)]$[/tex]
[tex]$\Delta G=8.314\times 298[\ln\frac{500}{1}+6.4 \times 10^{-4}(500-1)]$[/tex]
Δ G = 16.188 J/mol
Draw the structure of the product formed when the given compound is heated in aqueous base. The formula for the product is C8H12O. The starting material is a 6 carbon chain where carbon 1 is an aldehyde, carbon 2 has two methyl substituents and carbon 4 is double bonded to an oxygen. THis reacts with N a O H, water and heat.
Answer:
Please find the graph file in the attachment file.
Explanation:
Cl- and Ca2+
What is the same and what is
different for these two ions? Be specific and include numbers of any important
subatomic particles.
differences
Cl loses 1 electrons to become stableCa2 gains one electrons to become stableIs this statement true or false?
Living things are classified by shared characteristics.
Answer:
True!
Explanation:
Living things are classified by the characteristics they have in common. All living organisms are classified within the organization based on extremely fundamental, shared characteristics.
Which characteristic is a property of molecular
substances?
A. good heat conductivity
B. good electrical conductivity
C. low melting point
D. high melting point
Answer:
The correct answer is : C.
Explanation:
The characteristics of a property of molecular substances is low melting point.
What is the formula for the sulfate ion?
What is the formula for the sulfite ion?
What is the formula for the hydrogen sulfate ion?
Sulfate - SO4^-2
Sulfite - SO3^-2
Hydrogen Sulfate - HSO4-
What is the mass of 2.9 moles of calcium? Show all work!
Answer:
the mass of 2.9 moles of calcium is 116 g
Explanation:
The computation of the mass of 2.9 moles of calcium is shown below
As we know that
Mole = mass ÷ molar mass
where,
Moles be 2.9
And, we know that the molar mass of calcium be 40g/mol
Now put the values to the above formula
2.9 = Mass ÷ 40
So, the mass would be
= 40 × 2.9
= 116 g
Hence, the mass of 2.9 moles of calcium is 116 g
Question
In Woodward's 1952 synthesis of cholesterol, an elimination reaction was used to remove the C20 alcohol
substituent as shown below. The transformation is performed with acetic acid (hint: as opposed to a strong
base). Would you classify this as an E1 or E2 elimination?
Ola.E2
O b, E1
Look at Periodic Table. Which
element has 7 valence
electrons and is in period 3?
A. Fluorine
B. Sulfur
C. Chlorine
D. Bromine