Answer:
Explanation:
Rivers may be contaminated by sewage.
I do hope I helped you! :)
what is the mass in grams of 1.9×1023 atoms of lead?
Answer:
Explanation:
# moles that exist in 1.9 X 10 23 =
= # of atoms/# of Avogadro 's num
= 1.9 X 10 23 / 6.02x10 23
= 0.266 mole of Pb
now we calculate the mass
mass of lead = # mol x m.wt
= 0.266 X 106.4
= 28.30 gram
An example of an extensive physical property is
Group of answer choices
mass
density
boiling point
melting point
Answer:
boiling point
how do you tell if an chemical eqaution is unbalanced
Aqueous hydrochloric acid HCl will react with solid sodium hydroxide NaOH to produce aqueous sodium chloride NaCl and liquid water H2O. Suppose 9.84 g of hydrochloric acid is mixed with 3.1 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to 2 significant digits.
Answer:
1.4 g H₂O
Explanation:
In a reaction, the reactants are usually not present in exact stoichiometric amounts, that is, in the proportions indicated by the balanced equation. Frequently a large excess of one reactant is supplied to ensure that the more expensive reactant is completely converted to the desired product. Consequently, some reactant will be left over at the end of the reaction. The reactant used up first in a reaction is called the limiting reagent, because the maximum amount of product formed depends on how much of this reactant was originally present. When this reactant is used up, no more product can be formed.
What is the answer? Please
Answer:
To instill a high degree of personal honor, self-reliance, and confidence in each cadet by presenting a military environment in which cadets will be forced to rely upon themselves and their shipmates to study, work, and learn.
Consider this equilibrium reaction at 400 K. Br2(g)+Cl2(g)↽−−⇀2BrCl(g)Kc=7.0 If the composition of the reaction mixture at 400 K is [BrCl]=0.00415 M, [Br2]=0.00366 M, and [Cl2]=0.000672 M, what is the reaction quotient, ???? ? ????= How is the reaction quotient related to the equilibrium constant, Kc, for this reaction?
Answer:
Q = 7.0
Q = kc. The reaction is in equilibrium
Explanation:
Based on the reaction:
Br₂ + Cl₂ ⇄ 2BrCl
Equilibrium constant of the reaction, kc, is the ratio of equilibrium concentrations products over reactants powered to its reaction coefficient:
Kc = [BrCl]² / [Br₂] [Cl₂] = 7.0
Now, reaction quotient, Q, is write as the same Kc but the concentrations are actual concentrations:
Q = [BrCl]² / [Br₂] [Cl₂]
Replacing:
Q = [0.00415M]² / [0.00366M] [0.000672M]
Q = 7.0
Now, as Q = Kc = 7.0, the reaction mixture is in equilibrium
A 60.04 g sample of a compound of carbon, sulfur, hydrogen and oxygen is burned completely. Calculate the empirical formula if 44.8 L of water at STP and 88.0 g of CO2 is formed. In another experiment, a 15.00 g sample of the compound produced 1.00L SO2 at 25.0 oC and 3.05 atm. In a final experiment: 3.57 L of the compound at 2.33 atm and 25 o C weighted 35.0g Find the molecular formula of the compound.
Answer:
Empirical formula: C₂SH₄
Molecular formula: C₄S₂H₈
Explanation:
The empirical formula is the simplest whole ratio of atoms presents in an element.
The compound contains C, S and H, its empirical formula is CₐSₓHₙ. We need to determine a, x and n solving for the moles of each element, thus:
Moles H₂O - moles H-:
PV/RT = n
At STP, P is 1atm, and T is 273.15K:
1atm*44.8L / 0.082atmL/molK*273.15K
moles H₂O = 2 moles water = 4 moles of H
Because 1 moles of water contains 2 moles of H
Moles CO₂ = moles C:
88.0g CO₂ * (1mol / 44g) = 2 moles CO₂ = 2 moles C
The mass of carbon is:
2 moles * (12g/mol) = 24g
Mass of hydrogen:
4 moles * (1g/mol) = 4g
The mass of S is:
60.04g - 24g - 4g = 32.04g = 1 mole of S
Empirical formula is:
C₂SH₄Now, the moles of the compound in the final experiment are:
PV / RT = n
2.33atm*3.57L / 0.082atmL/molK*298.15K = 0.34 moles
-25°C = 298.15K. In gas laws you must use absolute temperature given in Kelvin-
These moles are in 35.0g. The molar mass of the compound is:
35.0g / 0.34 moles = 102.9g/mol
As the empirical formula is C₂SH₄ and weighs 60g/mol. Twice the empirical formula are the molecular formula:
C₄S₂H₈The Molecular formula of the compound: C₄S₂H₈
Empirical formula:It is the simplest whole number ratio of atoms present in a compound.The compound contains C, S and H, its empirical formula is CₐSₓHₙ. We need to determine a, x and n solving for the moles of each element, thus:Moles of H₂O= Moles of H:[tex]n=\frac{PV}{RT}[/tex]
At STP, P is 1atm, and T is 273.15K:
[tex]n= \frac{1atm*44.8L}{0.082atmL/molK*273.15K}[/tex]
Moles H₂O = 2 moles water = 4 moles of H
As, 1 moles of water contains 2 moles of H
Moles of CO₂ = Moles of C:88.0g CO₂ * (1mol / 44g) = 2 moles CO₂ = 2 moles C
We know,
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Mass of carbon is: [tex]2 moles * (12g/mol) = 24g[/tex]
Mass of hydrogen is: [tex]4 moles * (1g/mol) = 4g[/tex]
Mass of sulphur is: [tex]60.04g - 24g - 4g = 32.04g[/tex] = 1 mole of S
The derived Empirical formula will be: C₂SH₄
Now, the moles of the compound in the final experiment are:
[tex]n= \frac{PV}{RT}\\\\n=\frac{2.33atm*3.57L}{0.082atmL/molK*298.15K}\\\\ n= 0.34 moles[/tex]
These moles are in 35.0g. The molar mass of the compound is: [tex]\frac{35.0g}{0.34 moles} =102.9g/mol[/tex]
As the empirical formula is C₂SH₄ and weighs 60g/mol.
The empirical formula is two times the molecular formula: C₄S₂H₈
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A liquid containing 55.0 wt% methanol (M), 5.00 wt% polyacrylate (P), and 40.0 wt% water (W) is distilled at steady-state into a top steam and a bottom stream. The total mass flow rates of the top and bottom streams are the same. The top stream has 85.0 wt% M and 0% P. a. Can you set a basis of calculation in this problem? Why or why not? b. Calculate the composition (mass fractions) in the bottom stream.
Answer:
a) YES ( Basis : F=100kg/h)
b) composition mass fraction in the bottom stream
(Xm)B = 0.25
(Xp)B = 0.1
(Xw)B = 0.65
Explanation:
a)
Can you set a basis of calculation in this problem? Why or why not?
Yes we can set a basis if calculation in this problem.
A good basis makes the calculation more easier. the problem are given in weight basis so we can choose basis of feed rate of 100kg/h
BASIS : 100kg/h
b)
given that;
mass flow rate of M in the feeds Mf = 0.55*F = 0.55*100 = 55kg/h
mass flow rate of p in the feeds Pf = 0.05*F = 0.05*100 = 5kg/h
mass flow rate of W in the feeds Pf = 0.40*F = 0.40*100 = 40kg/h
Now Balance
F = T + B
( but T=B)
so F = T + T = 2T
B = T = 50kg/h
TOP
mass flow rate of M in the top Mt = 0.85*T = 0.85*50 = 42.5 KG/H
mass flow rate of P in the top Pt = 0kg/h
mass flow rate of W in the top Wt = 0.15*T = 0.15*50 = 7.5kg/h
balance on M
Mf = Mt + Mb
Mb = Mf - Mt = 55kg/h - 42.5kg/h = 12.5kg/h
Balance on P
Pf = Pb + Pt
Pb = Pf - Pt = 5kg/h - 0kg/h = 5kg/h
Balance on W
Wf = Wt + Wb
Wb = Wf - Wt = 40kg/h - 7.5kg/h = 32.5kg/h
So bottom composition
mass fraction of M in Bottom XmB = Mb/B = (12.5kg/g) / (50kg/h) = 0.25
mass fraction of P in Bottom XpB = Pb/B = (5kg/g) / (50kg/h) = 0.1
mass fraction of W in Bottom XwB = Wb/B = (32.5kg/g) / (50kg/h) = 0.65
14. Which of the following will result in a chemical change?
A. Melting ice to obtain water
B. Evaporating alcohol into vapor
C. Burning coal in a furnace
D. Drying wood in a shed
Help ASAP
Answer:
C
Explanation:
a chemical change is when a substance changes into another.
wood burning turns into heat which would be considered a chemical change
In the following atomic model, where does the strong nuclear force happen?
Answer:
the strong nuclear force happens in the neuclus
What is the mass of a block that measures 6.7cm x 6.8cm x4.3cm and has a density of 22.29g/cm³
Answer:
4366.8 grams or 4.4 kg
Explanation:
Density = Mass / Volume
Mass = Density x Volume
M = 6.7 x 6.8 x 4.3 x 22.29
M = 4366.8 g
Best Regards!
Based on your observations of the laboratory assignment(s) that produced gases, can you conclude
that the same gas was produced in each assignment? Briefly explain.
Answer:
With the use of same chemicals, same gas will be produced while the use of different chemicals, different gases will be produced.
Explanation:
The same gas was produced in each assignment if the same chemicals are mixed with each other while different gases were produced in each assignment when different chemicals are allowed to mix. If every time, same chemicals and same concentration of chemicals are mixed together, the result will be the same means production of same gas but if different chemicals are allowed to mix, then the product will be the production of different gases.
Please help need ASAP!!! Due tonight,
Name the Compounds. Spelling counts
SiCl4
N2O4
Answer:
Silicon tetrachloride
Dinitrogen tetroxide
The name of the compound SiCl₄ is named silicon tetrachloride and N₂O₄ is named dinitrogen tetroxide.
SiCl₄ is named silicon tetrachloride. It is composed of one silicon atom (Si) bonded to four chlorine atoms (Cl). The prefix "tetra-" indicates the presence of four chlorine atoms bonded to the central silicon atom.
N₂O₄ is named dinitrogen tetroxide. It consists of two nitrogen atoms (N) bonded to four oxygen atoms (O). The prefix "di-" indicates the presence of two nitrogen atoms, and the suffix "-tetraoxide" indicates the presence of four oxygen atoms.
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Pure water can be consumed in a chemical reaction, resulting in the formation of a new
product. Refer to paragraph four. What type of change is this?
A. A physical change
B. A chemical change
C. A mixture change
D. A compound change
0.00035 scientific notation
Use the drop-down menus to identify the career that matches each description Helos employees and management negotiate: Oversees payment of employees Maintains employee records, such as contact information: Oversees the Human Resources department of a company.
Answer:
✔ Labor Relations Specialist
✔ Compensation and Benefits Manager
✔ Human Resources Assistant
✔ Human Resources Manager
B
D
A
C
Answer:
Helps employees and management negotiate:
✔ Labor Relations Specialist or B.)
Oversees payment of employees:
✔ Compensation and Benefits Manager or D.)
Maintains employee records, such as contact information:
✔ Human Resources Assistant or A.)
Oversees the Human Resources department of a company:
✔ Human Resources Manager or C.)
2. The four parts, or blocks, on the
periodic table are _d, and f.
s, P
a, b
Answer:
s, p
Explanation:
The four parts, or orbitals, on the periodic table are s, p, d, and f.
Which of the reactions are spontaneous (favorable)?
A. 2Mg(s) + O2(g) rightarrow 2MgO (s) delta G = - 1137 kJ / mol
B. NH3(g) + HCl(g ) rightarrow NH4Cl(s) delta G = - 91.1 kJ / mol
C. AgCl(s) rightarrow Ag+ (aq) + Cl-[aq) delta G = 55.6 kJ / mol
D. 2H2(g) + O2(g) rightarrow 2H2O(g) delta G= 456 kJ / mol
E. C(s) + H2O(t) rightarrow CO(g) + H2(g) delta G = 90.8 kJ / mol
F. CH4(g) + 2O2(g) rightarrow CO2(g) + 2H2O(t) delta G = -820 kJ / mol
A. Reaction A.
B. Reaction B.
C. Reaction C.
D. Reaction D.
E. Reaction E.
F. Reaction F.
Answer: Reactions: A, B and F
Explanation: Gibbs Free Energy, symbol G, combines Enthalpy (sum of internal energy) and Entropy (measure of how much the energy of atoms and molecules become spread out in a process).
The change in free energy (ΔG) is the sum of enthalpy and the product of temperature and entropy of the system.
With free energy, it is possible to determine if a reaction is spontaneous, i.e., happens wthout external energy, or non-spontaneous.
If ΔG is negative, reaction is spontaneous. If ΔG is positive, reaction is non-spontaneous.
Analysing each ΔG of the reactions above, reactions A, B and F's Gibbs Free energy are negative, so these 3 are spontaneous.
Is gasoline evaporated, gasoline, burned water frozen and water heated up a chemical change
Answer:
as gasoline is evaporated, this gasoline still remains as gasoline but in gaseous form when gas is being burned .
Solve: (6.825 x 10-3) (1.2 x 10-8)
Choose the answer with the correct number of significant figures.
a 8.2 x 10-11
b 0.081 x 10-8
C 8.01 x 1011
d None of the above
Answer: a.) 8.2 x 10^-11
Explanation:
The measurement 3.8 x 10^3 g could also be written as
Right now it's written in scientific notation, so you can just move the decimal place in 3.8 to the right 3 times (as it is times 10 to the third power) to get 3,800g.
The measurement 3.8 x 10³ grams could also be written as 3.8 kilograms.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
As given in the problem we have to convert the measurement of 3.8 x 10³ grams into some different units,
1000 grams = 1 kilograms
1 gram = 1 /1000 kilograms
3.8 x 10³ grams = 3.8 x 10³ ×1 /1000 kilograms
=3.8 kilograms
Thus, the measurement 3.8 x 10³ grams could also be written as 3.8 kilograms.
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The measure of the amount of matter is known as _______?
Answer:
Mass is a measure of the amount of matter in a substance or an object. The basic SI unit for mass is the kilogram (kg), but smaller masses may be measured in grams (g).
What does green design refer to?
A. Using materials and design techniques that reduce the negative
environmental impact of a structure
B. Using innovative steel production, modern safety elevators, and
other engineering technologies
C. Using natural colors when designing building so that they don't
seem harsh against the natural landscape
D. Incorporating various materials' strengths and weaknesses in the
design process
SUBMIT
Answer:
A. Using materials and design techniques that reduce the negative
environmental impact of a structure
Explanation:
A P E X
Using materials and design techniques that reduce the negative
environmental impact of a structure. Hence, option A is correct.
What is green design?Green design is the 'creation of buildings which are energy-efficient healthy, comfortable, flexible in use and designed for long life.
The word ‘Green’ represents designs which are eco-friendly and less harmful to humans and other organisms. It helps in the protection of natural resources such as water, air etc.
Green designs are also referred to as techniques and materials that reduce the negative environmental impact of a structure.
Hence, option A is correct.
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Give the name of HI as an acid and as a binary compound
Answer:
HI is a diatomic molecular compound known as hydrogen iodide or hydroiodic acid. It is a strong acid.
What is the purpose of keeping a running list of new vocabulary words?
A. To make it easier to decode the word when you see it again
B. To provide an easy-to-remember picture associated with the word
C. To make it easier to remember and use new words
D. To allow you to critically evaluate every new word you come
across
Shjajfbcjahaixhfjwnzhsbsjxjdbxbsjzjfbwnznsnwnnsndndnwnbwjshsbdbdndnndndndbxbxnsnsn
Answer:
C
Explanation:
As C would be the wisest choice as being able to remember and use more words than the average human not only opens up your vocabulary but also your chances of writing a better essay using said words.
Answer:
C
Explanation:
Makes it easier to remember and use new words
Which ocean zone lies inside V-shaped ocean trenches? O A. Bathypelagic O B. Abyssopelagic Ο Ο Ο Ο O C. Mesopelagic O D. Hadalpelagic
Answer:
O D. Hadalpelagic is the answer.
HELPPP ANSWERS ????
A: 3
B: 2
C: 1
D: 4
Answer:
B. 2
Explanation:
We see from the reaction side of the equation that we have 2 Li. That means we need the same number of Li on the products side. Therefore, our only option is 2.
Answer:
b
Explanation:
A certain element XX has four isotopes. 5.845% of XX has a mass of 53.93961 amuamu. 91.75% of XX has a mass of 55.93494 amuamu. 2.123% of XX has a mass of 56.93539 amuamu. 0.2820% of XX has a mass of 57.93328 amuamu. What is the average atomic mass of element XX? Express your answer numerically to four signif
Answer:
55.85 amu
Explanation:
Let A, B, C and D represent the four isotopes of element X.
The following data were obtained from the question:
Isotope A:
Abundance (A%) = 5.845%
Mass of A = 53.93961 amu
Isotope B:
Abundance (B%) = 91.75%
Mass of B = 55.93494 amu
Isotope C:
Abundance (C%) = 2.123%
Mass of C = 56.93539 amu
Isotope D:
Abundance (D%) = 0.2820%
Mass of D = 57.93328 amu
Average atomic mass of element X =.?
The average atomic mass of X can be obtained as follow:
Average Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100] + [(Mass of D × D%)/100]
Average Atomic mass = [(53.93961 × 5.845)/100] + [(55.93494 × 91.75)/100] + [(56.93539 × 2.123)/100] + [(57.93328 × 0.2820)/100]
= 3.15277 + 51.32031 + 1.20874 + 0.16337
= 55.84519 ≈ 55.85
Therefore, the average atomic mass of X is 55.85 amu
Convert 542 nanograms to grams.
g.
Answer:
542 nanograms to grams = 5.42E-7g
Explanation:
The transfer of thermal energy by particles moving through a fluid (either a
gas or a liquid) is called?
Answer:
Convection
Explanation:
Convection is the transfer of thermal energy by particles moving through a fluid.
Answer:
convection
Explanation:
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