Answer:
32 °F
Formation. Hail forms in strong thunderstorm clouds, particularly those with intense updrafts, high liquid water content, great vertical extent, large water droplets, and where a good portion of the cloud layer is below freezing 0 °C (32 °F).
Explanation:
brainlist me and that's all I know and we have the same module I guess
why is it necessary to standardize a secondary standard before use?
As the name implies, a secondary standard is used by standard laboratories, which include companies involved in the preparation of reagents and kits, as well as laboratories responsible to produce quality control material for use by other laboratories. They use the primary standard as the primary calibrator or primary reference material, and they calibrate their instruments against it. Smaller labs use secondary standards to calibrate control material for analysis of unknown concentrations. For smaller labs, secondary standard serves as an external quality control. As a result, it is essential that the secondary standard be standardized against the primary standard before it can be applied.
I hope this helps you
:)
A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is a stainless-steel cylinder that measures wide 22cm and 26.4 high. The maximum safe pressure inside the vessel has been measured to be 6.30mpa.
For a certain reaction, the vessel may contain up to .537kg of dinitrogen monoxide gas. Calculate the maximum safe operating temperature the engineer should recommend for this reaction. Write your answer in degrees Celsius. Be sure your answer has the correct number of significant digits.
The maximum safe operating temperature for this reaction is equal to 895°C.
Given the following data:
Width of cylinder = 22 cm.Height, h = 26.4 cm.Maximum safe pressure = 6.30mpa.Mass = 0.537 kg.Scientific data:
Ideal gas constant, R = 8.314 L-kPa/Kmol.Molar mass of of dinitrogen monoxide ([tex]N_2F_2[/tex]) gas = 66 g/mol.Radius, r = [tex]\frac{width}{2} =\frac{22}{2} =11\;cm[/tex]
How to calculate the maximum safe operating temperature.First of all, we would determine the volume of the stainless-steel cylinder by using this formula:
[tex]V=\pi r^2 h\\\\V = 3.142 \times 11^2 \times 26.4\\\\[/tex]
Volume, V = 10,036.81 [tex]cm^3[/tex].
In liters, we have:
Volume, V = 10.04 Liters.
Next, we would determine the number of moles of dinitrogen monoxide ([tex]N_2F_2[/tex]) gas:
[tex]Number \;of \;moles = \frac {mass}{molar\;mass}\\\\Number \;of \;moles = \frac {537}{66}[/tex]
Number of moles = 8.136 moles.
Now, we can solve for the maximum safe operating temperature by applying the ideal gas equation:
[tex]PV=nRT\\\\T=\frac{PV}{nR} \\\\T=\frac{6.30 \times 10^3 \times 10.04}{8.136 \times 8.314}\\\\T=\frac{60541.2}{67.6427}[/tex]
T = 895.02 ≈ 895°C.
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If 30 grams of KCl is dissolved at 10°C, how many additional grams would be needed to make the solution saturated at 60°C? * Captionless Image 45g 20g 15g 75g
If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.
What is a saturated solution?A saturated solution is a solution in which there is so much solute that if there was any more, it would not dissolve. Its concentration is the same as the solubility at that temperature.
Step 1. Calculate the mass of water.At 10 °C, the solubility is 31.2 g KCl/100 g H₂O.
30 g KCl × 100 g H₂O/31.2 g KCl = 96 g H₂O
Step 2. Calculate the mass of KCl required to prepare a saturated solution at 60 °C.At 60 °C, the solubility is 45.8 g KCl/100 g H₂O.
96 g H₂O × 45.8 g KCl/100 g H₂O = 44 g KCl
Step 3. Calculate the mass of KCl that must be added.44 g - 30 g = 14 g
If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.
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explain chemical equilibrium
Answer:
chemical equilibrium, condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs. A reversible chemical reaction is one in which the products, as soon as they formed, react to produce the original reactants.
Explanation:
chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time, so that there is no observable change in the properties of the system.
(113) Fe, Co, and Ni are in a category of metals best known as
(A) Transition metals
(B) Alkali metals
(C) Rare metals
(D)Main group metals
(
Answer:
A
Explanation:
iron, cobalt and nickel are all transition metals
What is the chemical name
for ca2 and clo3-
Answer:
Calcium chlorate | Ca(ClO3)2 - PubChem.
Explanation:
Why is an enzyme in a chemical reaction like a lock and key?
A. The active site and the substrate fit perfectly together, and when they do, they unlock the chemical reaction.
B. The non-reactive site and the substrate fit perfectly together, and when they do, they unlock the chemical reaction.
C. None of these
D. The nucleoid and Golgi Apparatus fit perfectly together, and when they do, they unlock the chemical reaction.
E. The active site and the cell membrane fit perfectly together, and when they do, they unlock the chemical reaction.
Answer:
A
Explanation:
the enzyme is substrate specifix coz of this trait
what are chemical reaction
Example:-
Burning of waxWe cannot pull back the reaction to get wax back .
Answer:
Explanation:
The permanent change in which a new substance is formed is called a chemical reaction.
For example:
i)Burning of wood
ii)Cooking rice
iii)Forming curd from milk
The burning of wood is a chemical reaction because it is a permanent change and it cannot be reversed. Once it is done, it is over it can't be done again. And in the case of example iii, the milk turns into curd by chemical reaction. A new substance i.e curd is formed from the milk.
Hope you understood!
What happens when the temperature of a gas is increased?
O A. The boiling point will increase,
O B. The collisions between molecules will decrease,
O C. The volume will increase,
D. The pressure will decrease,
Calculate how many grams of oxygen form when 2.72 g of KCIOg reacts completely given the
following equation:
2 KCI03 (s)
- 2 KCI (s) + 302 (g)
1.06g
Please refer to the image attached.
You first find the number of moles (n) for KClO3 as you have been given the mass. So n = mass/Mr gives you the moles that is 0.022 mol
Next you use the ratio 2:3 as per the equation where it's 2KClO3 ---> 3O2 so you just cross multiply and get the moles for oxygen.
Now that you know the number of moles for oxygen, you can use the same moles equation that you used earlier to find the mass. mass=n×Mr and so you get the answer as 1.06g of oxygen.
Gives 2 reaction in which benzene ring is retained and 2 reaction in which benzene ring is not retained
Hey dear,
Benzene is a 6-C cyclic structure with alternate double bonds.
● Reactions -
1) Benzene to cyclohexane -
Benzene can be reduced to cyclohexane with
the help of Ni/H2. C6H6 + 3H2 --> C6H12
All 3 double bonds in ring are reduced here.
2) Benzene to benzoquinone - Benzene can be oxidized to benzoquinone with
the help of acidic K2Cr207. C6H6 +3[O] --> C6H4O2 + H2O
Only 1 double bond is lost in this reaction.
Hope this helps you.
How many grams does 5 helium atoms weigh?
Answer:
4.002602
Explanation:
the average that reflects the typical ratio of natural abundances of its isotopes.
The weight of 5 helium atoms in grams is 20.01301 grams.
What are atoms?Atoms are defined as the smallest unit into which matter can divided without the release of electrically charged particles.
It is also defined as a building block of matter and were discovered after big bang theory. It is a fundamental piece of matter.
The weight of 1 helium atom = 4.002602 g
So, the weight of 5 helium atom = 4.002602 x 5
= 20.01301 g
Thus, the weight of 5 helium atoms in grams is 20.01301 grams.
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23.4 grams of Al2(SO3)3 is yielded through a chemical reaction. How many moles is this?
Answer:
.0796 mole
Explanation:
Al2 (SO3)3 add the molecular weights
2 * Al = 2 * 26.982 +
3 * S = 3 * 32.06 +
9 * O = 6 * 15.999 = 294.135 gm per mole
Now... you have 23.4 grams of this substance
23.4/294.135 = .0796 mole
EDITED !
Complete this example: A 0.67 molal solution was
made by dissolving glucose in water. The boiling
point of pure water is 100.00°C. The boiling point
constant for water is 0.51°C kg/mol.
on
the
Set up the problem.
• 4T2 = (0.51°C•kg/mole)(0.67 m)
of
• What is the 473 value?
vc
• What is the boiling point for the glucose
solution?
УРС
Answer:
A then C
Explanation:
Answer:
a,c
Explanation:
Name the Covalent compound NH3O2
The name of the covalent compound NH3 O2 is dihydroxylamine.
Naming compoundsAccording to the task content;
It follows that the given covalent compound whose name is to be written is; NH3O2.On this note, the compound possesses 2 oxygen atoms, 3 Hydrogen atoms and 1 Nitrogen atom. Hence, the name of the covalent compound is Dihydroxylamine.
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XeF6
formula mass =
molar mass =
Answer:
Xenon hexafluoride's molar mass is about 245.28 g/mol
Formula mass is about 245.28 u.
Explanation:
So we want to find the formula mass of the XeF6 and there is a special formula for that.
You have to multiply the number of each element in XeF6 by the element's atomic mass.
The atomic mass of Xe is 131.293, and F's atomic mass is multiplied by 6, due to the 6 at the bottom. F's atomic mass is 18.998403, so we multiply the atomic number by 6, which would equal 113.990418. Round if you want, but it would equal mostly the same thing. Add it up to get ≈245.28, which is the same thing.
Therefore the formula mass of XeF6 is 245.28 u.
Calculate the pOH for a solution that has a hydroxide ion, (OH-) concentration of 5.02 X 10-4 M.
Calculate the pH.
Note: the answers should have three significant figures
Answer:
Explanation:
Calculate the pOH for a solution that has a hydroxide ion, (OH-) concentration of 5.02 X 10-4 M.
Calculate the pH.
Note: the answers should have three significant figures
How many R.P.'s is equivalent to 0.780 g of Na₂CO₂?
Answer:
pbo2+cl-=clo-+pb(oh)2
Explanation:
balance by ion electron
A chemistry assignment has a student conduct a single replacement reaction by adding 7.5g of sodium metal to 20.0g of aluminum chloride. How much aluminum in moles would precipitate out as a result of the reaction
Answer: 0.109 mol
Explanation:
Balanced chemical equation:
3 Na(s) + AlCl3(aq) --> 3 NaCl(aq) + Al(s)
3 moles of sodium metal react with 1 mole of aluminum chloride to produce 3 moles of aluminum chloride and 1 mole of solid aluminum
Molar mass of Na = 22.99 g/mol
Mass(Na) = 7.5 g
Find number of moles of Na:
n = mass of Na/molar mass of Na
=(7.5 g)/(22.99 g/mol)
= 0.3262 mol
Molar mass of AlCl3,
MM = 1*MM(Al) + 3*MM(Cl)
= 1*26.98 + 3*35.45
= 133.33 g/mol
Mass(AlCl3) = 20.0 g
Find number of moles of AlCl3,
n = mass of AlCl3/molar mass of AlCl3
=(20 g)/(1.333*10^2 g/mol)
= 0.15 mol
Balanced chemical equation is:
3 Na + AlCl3 ---> Al + 3 NaCl
3 mol of Na reacts with 1 mol of AlCl3
for 0.3262 mol of Na, 0.1087 mol of AlCl3 is required
But we have 0.15 mol of AlCl3
So, Na is the limiting reagent and we will use it in our further calculations.
According to balanced equation:
mol of Al formed = (1/3) * moles of Na
= (1/3)*0.3262
= 0.1087 mol
Answer: 0.109 mol of aluminum will precipitate out as a result of the reaction
A 5.00 L flask at 25˚ C contains 0.200 mol of Cl2 . What is the pressure in the flask?
The pressure of a 5.00 L flask at 25˚ C that contains 0.200 mol of Cl2 is 0.98atm.
How to calculate pressure?The pressure of a gas can be calculated by using the following expression:
PV = nRT
Where;
P = pressureV = volumen = number of molesR = gas law constantT = temperatureP × 5 = 0.2 × 0.0821 × 298
5P = 4.893
P = 4.893 ÷ 5
P = 0.98atm
Therefore, the pressure of a 5.00 L flask at 25˚ C that contains 0.200 mol of Cl2 is 0.98atm.
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Answer:
Your answer would be:
0.98atm.
Explanation:
Have a great rest of your day
#TheWizzer
Remove all the tape pieces from part A, and throw them in the trash. Next, follow these steps to compare pieces of sticky tape that have different charges:
Tear off two pieces of tape that are about 15 cm (6 inches) long. Similar to part A, fold under a half inch of each piece to make the strips easier to pull off.
Stick one of the pieces onto the tabletop. Smooth the tape down.
Stick the second piece of tape onto the tape piece you just placed. Do not cover the tab of the first piece of tape.
Grasp one tape tab in each hand. Carefully pull both pieces off the table and separate them. Turn the non-sticky sides of the tape toward each other.
What do you observe? If there’s an interaction, explain whether the tape pieces attract or repel each other. (ANSWER ASAP)
The interaction which will occur when the non sticky tape pieces are turned towards each other is attraction.
What is Attraction?This involves the coming together of objects as a result of a force. When non-sticky sides of the tape are brought towards each other attraction takes place due to the sticky content.
This however wears off after some time thereby making it the most appropriate choice.
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According to Bohr's Model, which one is correct about a transition from n=2 to n=1 in a hydrogen atom?
When an electron moves from n = 2 to n = 1, it emits a photon of ultraviolet light.
What happen in transition from n= to n=1?During transition from n=2 to n=1 in a hydrogen atom, the electron emits energy in the form of photon. We know that when electron absorb energy, it moves from lower level to higher level and vice versa.
So we can conclude that when an electron moves from n = 2 to n = 1, it emits a photon of ultraviolet light.
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What is the most metallic character with low ionization energies
Answer:
Metals tend to lose electrons in chemical reactions, as indicated by their low ionization energies. Within a compound, metal atoms have relatively low attraction for electrons, as indicated by their low electronegativities.
If 0.380 mol of barium nitrate is allowed to react with an excess of phosphoric acid, how many moles of barium phosphate could be formed?
Ba (NO3)2+ H3PO4 → Ba3(PO4)2+ HNO3
If 0.380 mol of barium nitrate is allowed to react with an excess of phosphoric acid, 0.127 moles of barium phosphate could be formed.
How to calculate number of moles?The number of moles of a compound can be calculated stoichiometrically as follows:
Based on this question, the following chemical equation is given:
Ba (NO3)2+ H3PO4 → Ba3(PO4)2+ HNO3
The balanced equation is as follows:
3Ba(NO3)2 + 2H3PO4 → Ba3(PO4)2 + 6HNO3
3 moles of barium nitrate produces 1 mole of barium phosphate
Therefore, 0.380 moles of barium nitrate will produce 0.380/3 = 0.127moles of barium phosphate.
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How do human population growth trends differ between developed nations and developing nations?
Answer:
Growing population
The worlds developing regions will see 1.2 billion people added, a 20.7% increase; while the population of developed countries will increase a mere 3.3% adding 41 million to the current 1.3 billion people.
Which statement describes a digital signal?
Answer:
digital signal
Answer:
Its made of numbers
Explanation:
did the assignment, hope this helps :]
Which one of these are a physical property? Select all that apply. a. Luster (shininess) Conducts Electricity Reactivity with water d. Temperature b. 0 0
PLEASE HELP!!!!!!!
You compare the gas generated from a reaction using two antacid tablets with the gas generated from a reaction using four antacid tablets (consider the antacid as the limiting reagent).
At constant pressure and temperature, how do the volumes of the gases compare?
The two reactions produce the same amount of gas.
The gas generated by four antacid tablets has a smaller volume.
The gas generated by two antacid tablets has a smaller volume.
Answer: The gas generated by two antacid tablets has a smaller volume.
Explanation:
Since the antiacid is the limiting reagent, we know that the more tablets there are, the more gas there will be.
This means that there will be more gas generated by the four antiacid tablets when compared to the two antiacid tablets, which gives us that the gas generated by the two antiacid tablets has a smaller volume.
1. List the actual volume of titrant needed to produce a color change for Sample A and Sample B. Answer: Volume of titrant needed to produce a color change for Sample A:\ ml Volume of titrant needed to produce a color change for Sample B: ml
Answer: B Hope this helps :)
One material property that is widely used and recognized is the strength of a material. But what does the word "strength" mean? "Strength" can have many meanings, so let us take a closer look at what is meant by the strength of a material. We will look at a very easy experiment that provides lots of information about the strength or the mechanical behavior of a material, called the tensile test.
The basic idea of a tensile test is to place a sample of a material between two fixtures called "grips" which clamp the material. The material has known dimensions, like length and cross-sectional area. We then begin to apply weight to the material gripped at one end while the other end is fixed. We keep increasing the weight (often called the load or force) while at the same time measuring the change in length of the sample.
Explanation:
what is the volume of
NH4 NO3(s) — N2O(g) + 2H2O(g)
Answer:
Explanation:
NH4NO3(s) N2O(g) + 2H2O(g) What is the total volume of gases produced at 546 K and 1.00 atm pressure when 240 g of ammonium nitrate undergoes the above decomposition reaction? A) 9 × 22.4 L B) 3 × 22.4 L C) 12 × 22.4 L D) 18 × 22.4 L E) 6 × 22.4 L