Answer:
mesosphere
Explanation:
The coldest layer of the atmosphere is known as the mesosphere.
The layers of the atmosphere have the coldest temperatures is mesosphere. Therefore, option B is correct.
What is mesosphere ?The third layer of the atmosphere, the mesosphere, is situated just above the stratosphere and under the thermosphere. As altitude rises, temperature drops in the mesosphere.
The third of the five layers that make up the Earth's atmosphere, the mesosphere, is located between the thermosphere and the stratosphere.
It is distinguished by a temperature that drops with altitude, becoming the coldest region of the entire atmosphere at a minimum of around 55 miles above the surface.
The coldest part of the Earth's atmosphere is the top of the mesosphere, where temperatures can locally drop as low as 100 K (-173°C).
Thus, option B is correct.
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A secondary step in the process to produce ultra-pure silicon is to combine silicon tetrachloride with magnesium. How many grams of Si could be produced by reacting 2.00 kg of SiCl4 with excess Mg
The mass of silicon, Si produced from the reaction is 329.41 g
Balanced equationSiCl₄ + 2Mg —> 2MgCl₂ + Si
Molar mass of SiCl₄ = 28 + (35.5×4) = 170 g/mol
Mass of SiCl₄ from the balanced equation = 1 × 170 = 170 g
Molar mass of Si = 28 g/mol
Mass of Si from the balanced equation = 1 × 28 = 28 g
From the balanced equation above,
170 g of SiCl₄ reacted to produce 28 g of Si.
How to determine the mass of Si producedFrom the balanced equation above,
170 g of SiCl₄ reacted to produce 28 g of Si.
Therefore,
2 Kg (i.e 2000 g) of SiCl₄ will react to produce = (2000 × 28) / 170 = 329.41 g of Si
Thus, 329.41 g of Si were obtained from the reaction
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Fill in the coefficients to balance the equation for the chemical reaction that occurs:
_NaCl(aq) + _AgNO3(aq) --> _AgCl(s) + _NaNO3
Answer:
The equation is balanced
Explanation:
NaCl (aq) + AgNO3(aq) ––> AgCl (s) + NaNO3 (aq)
NaCl (aq) + AgNO3 (aq)
Na = 1 , Cl=1 , Ag = 1 , No3= 1
AgCl (s) + NaNO3 (aq)
Ag = 1 , Cl=1 , Na = 1 , No3= 1
PLEASE HELP!!
Some organisms are able to carry out both cellular respiration and fermentation. Which process do you think is used more often?
Are any of these equations redox reactions? if so what are their reducing and oxidizing agents?
7O2(g)+2CH3CH3(g)→4CO2(g)+6H2O(g)
HSO-4(aq)+OH-(aq)→SO42-(aq)+H2O(l)
Fe(s)+CuSO4→FeSO4(aq)+Cu(s)
Yes, Fe(s)+CuSO4→FeSO4(aq)+Cu(s) is a redox reaction. The reducing agent is Fe(s), while the oxidizing agent is CuSO4.
Oxidation-reduction reaction (redox)Oxidation-reduction reaction is the type of reaction in which electrons are transferred from one element to another. A compound or an element either gains are looses an electron in redox reactions.
Fe(s)+CuSO4→FeSO4(aq)+Cu(s)
From the equation above, Fe(s) is the reducing agent because it gives away 2 electrons and undergoes oxidation reaction.
From the equation above, CuSO4 is an oxidizing agent because it gives oxygen to Fe(s) and undergoes a reduction reaction.
Therefore, the reducing agent is Fe(s), while the oxidizing agent is CuSO4.
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You will be performing many dilutions in this experiment. If John adds 17.51 mL of 6M HCl to 6.36 mL of distilled water, what is the final concentration, in M, of HCl
The molarity of the solution decreases on dilution by adding distilled water. The molarity of the solution of 17.51 ml , 6 M HCl when added to 6.36 ml is 4.4 M.
What is molarity ?Molarity is a common term used to express the concentration of a solution. The molarity of a solution is the ratio of the number of moles of solute to the volume solution in liter.
If a solution of volume V1 ml with M1 molarity is diluted to V2 ml of M2 molarity, then, the relation between the two concentrations is written as:
M1 V1 = M2 V2.
given, M1 = 6 M
V1 = 17.51
the volume after the addition of 6.36 ml water, v2 = 17.51 + 6.36 = 23.78 ml
then M2 = M1 V1/V2
M2 = 6 M × 17.51 ml/ 23.78 ml
= 4.4 M.
Therefore, the molarity of the solution after dilution is 4.4 M.
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Which of the following does NOT influences climate change?
Which of the following does NOT influences climate change?
All of these have an effect on climate change
Planting trees
Burning greenhouse gases
driving cars
Answer:
Driving cars
Explanation:
Because driving cars won't effect climate change
Forensic scientists reliably provide exact times of death based on their analyses.
1. True
2. False
Answer:
The answer to this question would be: False
Explanation:
Which of these has the greatest freezing point depression? Which of these has the greatest freezing point depression? Aqueous solution of NaCl (m = 0.01) Aqueous solution of CaCl2 (m = 0.01) Aqueous solution of C12H22O11 (m = 0.01) Pure water
The substance with the higher freezing point depression is CaCl2.
What is water's freezing point?Water freezes at 0° C in normal conditions but once water is mixed with other substances this temperature can change.
How does the freezing point change?As previously mentioned, the freezing point changes according to the substance water is mixed with, here are the changes for the listed substances:
Water with NaCl: -3.72 °CWater with CaCl2: -5.58 °C Water with C12H22O11 (Sucrose): -0.68 °C Pure water: No changesBased on this, the one that has the greatest freezing point depression is CaCl2.
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Suzie made the following observations while spending the weekend at her
grandmother's home.
1.
II.
Red beans swell when soaked in water
Cucumber springs water when salt is added to it
She can tell when her sister is around from the scent of her perfume
II.
a. State TWO general deductions which can be made from all these
observations about the nature of matter. (4 marks)
b. Use your deductions in (a) above to explain observation III. (3 marks
Answer:
...
Explanation:
i lowkey dont know what to put, i just need my points srry;(
Which component of the steam sterilizer is the coolest?
Answer:
Thermostatic valve
Explanation:
"Is located in the drain line; the drain and the area surrounding it are the coolest areas in the sterilizer. A sensor in the chamber drain measures steam temperature and automatically controls the flow of air and condensate from the sterilizing chamber."
Hope this helps
Length (miles)
1
1.3
2.
3.2
3
0.9
4
1.8
What is the shortest measurement you made, in SI units? 1 mi = 1.61 km.
A. 3.2 km
B. 7.2 km
C. 1.4 km
D. 5.2 km
Answer:
The answer is 1.4 km
Explanation:
Balancing chemical equations
Answer:
2B2 + 3O2 → 2B2O3
Explanation:
Balance The Equation: B2 + O2 = B2O3
1. Label Each Compound With a Variable
aB2 + bO2 = cB2O3
2. Create a System of Equations, One Per Element
B: 2a + 0b = 2c
O: 0a + 2b = 3c
3. Solve For All Variables (using substitution, gauss elimination, or a calculator)
a = 2
b = 3
c = 2
4. Substitute Coefficients and Verify Result
2B2 + 3O2 = 2B2O3
L R
B: 4 4 ✔️
O: 6 6 ✔️
hope this helps!
Mrs. Allex kicks a beach ball. What is the action? What is the reaction?
Answer:
The action is acceleration and the reaction is friction
In some parts of the galaxy, electrons in hot hydrogen gas may be excited to very high quantum levels. Calculate the wavelength of light that would be emitted if electrons moved from the =20 shell to the =2 shell.
When light bounces we call it?
Answer:
when light bounched we call it, reflection
Based on the observations of how the different forms of salt start mixing with the
water, which type of salt particle do you expect to fully dissolve at the end of the 45
minutes?
Fine
Coarse
Pellet
Is it an acid or alkaline that is added to a metal to make it oxide
please answer it is Urgent
Answer:
i am not sure but is it hydrogen oxide
Explanation:
According to Charles’s Law, what would happen to the volume (V) of an ideal gas when the absolute temperature (T) of gas increases by three-fold at pressure (P) and amount of gas (n).
Select one:
1)The volume of the gas decreases.
2)The final volume will be 1/3 of the initial volume.
3)The volume of the gas does not change.
4)The volume of the gas triples.
According to Charles' law, when the temperature of an ideal gas increases by three-fold at pressure (P), the volume of the gas also triples.
What is charles law?Charles law states that the volume of a given gas is directly proportional to the temperature provided that the pressure remains constant.
This is denoted by the following expression:
V1/T1 = V2/T2This means that as the volume increases, the temperature of the gas also increases and vice versa.
Therefore, when the temperature of an ideal gas increases by three-fold at pressure (P), the volume of the gas also triples.
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1. Name the three particles of the atom and their respective charges are:
a.
b.
C.
the atom's
a protons
b neutrons
c electrons
I hope this helps :)
As the [H] In a solution decreases, what happens to the [OH-]?
ОА. It Increases and the pH increases.
OB. It increases and the pH decreases.
Ос. It Increases and the pH stays constant.
OD. It decreases and the pH increases.
OE. It decreases and the pH decreases.
Calculate the wavelength of an electromagnetic wave with a frequency of 8.68 * 10 ^ 16 * H * z ; 5.0 * 10 ^ 14 * H * z and 1.00 * 10 ^ 6 * H * z .
Answer:
3.46 x 10^-9 m; 6.0 x 10^-7 m; 3.00 x 10^20 Hz
Explanation:
I'm not 100% sure abt the last one
The wavelength of the electromagnetic wave with frequencies of 8.68×10¹⁶ H z, 5.0 ×10¹⁴ Hz, and 1.00× 10⁶ Hz is equal to 3.45nm, 6.00 nm, and 30 nm respectively.
What are frequency and wavelength?The frequency of the electromagnetic wave can be described as the number of oscillations of an electromagnetic wave in one second. The frequency of a wave has S.I. units which are represented as per second or hertz.
The wavelength of the electromagnetic wave is the distance between the two adjacent points in phase w.r.t. each other.
The relationship between wavelength (λ), frequency, and speed of light (c) of electromagnetic waves are:
c = νλ
Given, the frequency of the wave, ν = 8.68×10¹⁶ Hz
The speed of light, [tex]c = 3\times10^8 m/s[/tex]
The wavelength of the electromagnetic waves can determine from the above-mentioned relationship:
λ = c/ν = 3×10⁸/8.68×10¹⁶ = 3.45 × 10⁻⁹ m. = 3.45 nm
Given, the frequency of the wave, ν = 5.0 ×10¹⁴ Hz
λ = c/ν = 3×10⁸/5.0 ×10¹⁴ Hz = 6 × 10⁻⁹ m. = 6.00 nm
Given, the frequency of the wave, ν = 1.00× 10⁶ Hz
λ = c/ν = 3×10⁸/1.00× 10⁶ Hz = 3.00 × 10⁻⁸ m. = 30 nm
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Ionic Bonding - Problems
Which of the following could NOT form an ionic compound?
Check all that apply.
Lit and CI-
F- and O2-
Ba2+ and Ag
Mg2+ and S2
Answer:
F- and O2-
Mg2+ and S2
Explanation:
Ionic compounds compose of a metal and a nonmetal. They also compose of a cation(positively charged) and anion(negatively charged). Fluorine and Oxygen are both nonmetals and negatively charged. Barium and silver are both positively charged metals.
DIFFERENCE BETWEEN LOWEST AND HIGHEST MELTING POINT OOF CARBON FIBRE
Answer:
The carbon fiber itself will withstand incredibly high temps. The weak point will be the epoxies or the resins.Ambient-cured epoxies will typically begin breaking down around 100 °C. The heat-cured epoxies that will go up to around 300 °C. As you get into the high temp ratings, the epoxies get trickier to handle, install, cure.Since the compositions of most irons while casting are around the eutectic point (lowest liquid point) of the iron–carbon system, the melting temperatures usually range from 1,150 to 1,200 °C.As is evident, at such high temperatures, the epoxies of Carbon Fibers will melt. So, they are not yet used for iron casting.
An ideal gas sample occupies 1.50 L at 25.0 o C and 741 mm Hg. How many moles are there in the sample
Ideal gas law is valid only for ideal gas not for vanderwaal gas. There are so many laws that are deduced from ideal gas equation. There are 0.05mole in the sample occupies 1.50 L at 25.0 o C and 741 mm Hg.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
P×V=n×R×T
where,
P = pressure of ideal gas= 741 mm Hg= 0.97 atm
V= volume of ideal gas =1.50 L
n =number of moles of ideal gas
T =temperature of ideal gas =25°C =298K
R = Gas constant = 0.0821 L.atm/K.mol
substituting the values
P×V=n×R×T
0.97 atm ×1.50 L=n×0.0821 ×298
number of moles of ideal gas =0.05mole
Therefore, there are 0.05mole in the sample occupies 1.50 L at 25.0 o C and 741 mm Hg.
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Which phenomenon best explains the miscibility of heptane (CH3CH2CH2CH2CH2CH2CH3) in pentane (CH3CH2CH2CH2CH3)
The phenomenon that best explains the miscibility of heptane in pentane is that both are non-polar compounds.
Solubility of compoundsSolubility is defined as the ability of a solute or substance to dissolve in a given solvent and at a particular temperature.
Heptane is a straight-chain alkane hydrocarbon that contains 7 carbon atoms. It is a non polar solvent.
Pentane is also a straight-chain alkane hydrocarbon that contains 5 carbon atoms. It is also a non- polar solvent.
Both pentane and heptane are non-polar because the atoms in their molecules share electrons equally. They are able to dissolve each other because they are alike.
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Write balanced equations for the reactions that occur when Glucose (C6H12O6) reacts with oxygen gas to produce gaseous carbon dioxide and
water vapour.
C6H12O6 + 6O2 ==> 6CO2 + 6H2O
kind of out of topic:
oxygen is usually represented as O2 since its diatomic
can guys help me to answer it
explain how would find the solubility of a solute
Answer:
Solubility indicates the maximum amount of substance that can be dissolved in a solvent at a particular temperature. Such a solution is called saturation. Divide the mass of the compound by the mass of the solvent, multiply by 100 g, and calculate the solubility in g / 100 g.
Explanation:
An electrochemical cell is based on these two half-reactions and their given standard reduction potential values:
Ox: Sn(s)→Sn2+(aq,1.60molL−1)+2e−E∘anode=−0.14(V)
Red: ClO2(g,0.220bar)+e−→ClO−2(aq,1.60molL−1)E∘cathode=0.95(V)
Compute the cell potential at 25 ∘C .
The potential of the electrochemical cell is 0.03 V.
What is an electrochemical cell?An electrochemical cell is a cell that produces chemical energy from a spontaneous chemical process. Let us recall that cell potential can be obtained from; Ecell = 0.0592/n log K
The cell equation is;
Sn(s) + ClO2(g) ----> Sn^2+(aq) + ClO^2-(aq)
Hence;
K = (1.60) (1.60)/(0.220)
K = 11.6
Therefore;
Ecell = 0.0592/2 log (11.6)
= 0.03 V
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How many moles of NaCL are present in 600mL of a 1.55 M NaCL solution?
Answer:
1000 ml - 1.55M 600 ml - x X 600*1.55/1000=0.93 M
