In order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent just until it covers the sample in an Erlenmeyer flask on a hot plate.
What is recrystallization solvent?Recrystallization involves dissolving the material to be purified (the solute) in an appropriate hot solvent.
Recrystallization, also known as fractional crystallization, is a procedure for purifying an impure compound in a solvent.
The method of purification is based on the principle that the solubility of most solids increases with increased temperature. Small crystals may trap impurities.
Thus, in order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent just until it covers the sample in an Erlenmeyer flask on a hot plate. Turn on the heat, starting at a low setting and increasing gradually.
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what are the key concepts in the kinetic molecular theory (collision theory”
Answer:
The Police Officer
Explanation:
The Police Officer said : her key the best key on world
Is there another problem? Police officer Dua is right.Calculate the speed of light in an unknown substance whose index of refraction is 1.65. Would you expect the light to bend toward the normal or away from the normal when it passes from air into the substance?
(a) The speed of light in the unknown substance is determined 1.82 x 10⁸ m/s.
(b) The light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.
What is the speed of light?The speed of light passing from air into the substance is calculated as follows;
refractive index = speed of light in air / speed of light in the substance
speed of light in the substance = speed of light in air/refractive index
speed of light in the substance = (3 x 10⁸) / (1.65)
speed of light in the substance = 1.82 x 10⁸ m/s
Thus, the light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.
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if 4.50 mol of ethane, c_(2)h_(6),undergo combustion according to the equation below , how many moles of oxygen are required? 2C_(2)H_(6)+7O_(2 )->4CO_(2)+6H_(2)O
15.75 moles of oxygen is required for 4.5 mole of ethane.
What is a Combustion Reaction ?The reaction in which a fuel gets oxidized by an oxidizing agent is called a Combustion Reaction , releasing a large amount of energy is called Combustion Reaction.
It is given in the question that
4.50 mole of ethane undergoes Combustion
2C₂H₆ + 7O₂ -> 4CO₂ +6H₂O
Mole fraction of ethane to oxygen is 2:7
Moles of ethane = 4.5
4.5 /x = 2/7
4.5 * 7 / 2 = x
x = 15.75 moles.
Therefore 15.75 moles of oxygen is required for 4.5 mole of ethane.
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Avogadro’s number is the number of particles in one mole of a pure substance, true or false?
Answer: The answer is true.
Explanation: Avogadro's number is a mole, which concludes that this statement is true.
The equations are not balanced. which equation would have the same coefficients in the same order as 2co2 3h20 c2h6o 3o2? fecl3 nh4oh fe(oh)3 nh4cl ch4 o2 co2 h2o fe h2so4 fe2(so4)3 h2 pcl5 h2o hcl h3po4
[tex]2 Fe (s) + 3 H _2SO _4 (aq)[/tex] → [tex]Fe _2(SO _4) _3 (s) + 3 H _2 (g)[/tex] equation has the same coefficients in the same order as [tex]3 O_2 + C_2H_6O[/tex] → [tex]2 CO_2 + 3 H_2O[/tex]
What are coefficients in the balanced equation?The numbers placed in front of formulas to balance equations are called coefficients.
For the given equation [tex]3 O_2 + C_2H_6O[/tex] → [tex]2 CO_2 + 3 H_2O[/tex] sum of the coefficient of the reactant side is 5 and sum of the coefficient is 4.
So, according to the question [tex]2 Fe (s) + 3 H _2SO _4 (aq)[/tex] → [tex]Fe _2(SO _4) _3 (s) + 3 H _2 (g)[/tex] equation has the same coefficients in the same order as [tex]3 O_2 + C_2H_6O[/tex] → [tex]2 CO_2 + 3 H_2O[/tex]
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Answer:
It’s c
Explanation:
edge 2022
What is the pH of a solution that contains 0.0003 moles of KOH in 410 mL of solution?
Answer: 10.865
Explanation:
The molarity of the solution is [tex]\frac{0.0003}{0.410}=0.0007317073 \text{ M}[/tex].
So, the pOH is [tex]-\log(0.0007317073)=3.135[/tex]
Since pH + pOH = 14, the pH is 14-3.135, which is about 10.865
Why would scientists use molar volume to measure gases?
Answer:
The molar volume of a gas expresses the volume occupied by 1 mole of that respective gas under certain temperature and pressure conditions.
scientists use molar volume to measure gas because it it tells us about volume occupied by gas.
Molar volume
The molar volume of a gas tell us about volume occupied by 1 mole of that respective gas under certain temperature and pressure conditions.At STP(Standard Temperature and Pressure) condition which is equal to 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm.The molar volume of a gas is derived from the ideal gas law PV=NRTHow many particles would be found in a 12.7g sample of ammonium carbonate?
answer choices are:
2.9 x 10^22 particles
7.96 x 10^22 particles
i cannot get it, please help
multiplying terrorist to power 23, divided by 96. Multiplied by 12.7. so this is 76.48
7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate. A particle is a tiny, localized item.
What is particles in chemistry?A particle is a tiny, localized item that may be defined by a number of physical or chemical characteristics, including volume, density, and mass. They range significantly in size or number from tiny particles like atoms to subatomic particles such as the electron.
Depending upon their density, particles can potentially be utilized to mimic even bigger things, such as moving celestial bodies or a throng of people. Although the meaning of the word particle is quite broad, different scientific disciplines might refine it as necessary. Any substance made up of particles is referred to as a particulate.
number of moles = given mass/ molar mass
= 12.7/ 96.08
= 0.13moles
number of particle= 0.13 × 6.022×10²³
= 7.96 x 10²²
Therefore, 7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate.
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After learning about climate change in her science class, selena wants to make a few changes at home so she can affect climate change in a small way. which changes will give her the best results?
Selena can change from burning fossil fuel in her home to using solar energy.
What causes climate changes?Climate change is caused by the release of the greenhouse gases which is gotten through the use and burning of fossil fuels such as coal.
The use of solar panels and solar energy by Selena in her house can help adjust the climate changes by decreasing the amount of greenhouse gases released into the atmosphere.
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Which description best describes n in the ideal gas law equation? *
How hard the particles are pushing on something
How many particles of something there is
How hot/cold something is
How much space something takes up
8.3145 L kPa / K mol
Answer:
How Hot Or cold it is is how it may be perceived
Imagine that you need to determine the molarity of a solution that you prepare by dissolving 11.0g of NaCl in exactly 100mL of solution. A. What info do you have B. What info do you need. C. Determine the molarity of the solution.
Answer:
A.) You have been given grams of NaCl (11.0 g) and the volume of the solution (100 mL).
B.) You need to determine the moles of NaCl and the volume of the solution in liters. To find the moles of NaCl , you need to know the molar mass of NaCl.
C.) 1.88 M
Explanation:
To find the molarity of the solution, you need to (1) convert mL to L (by dividing by 1,000), then (2) convert moles NaCl to grams (via molar mass from periodic table), then (3) plug the values into the molarity equation.
Volume = 100 mL / 1,000 = 0.100 L
Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol
Molar Mass (NaCl) = 58.44 g/mol
11.0 g NaCl 1 mole
----------------- x --------------- = 0.188 moles NaCl
58.44 g
Molarity = moles / volume
Molarity = 0.188 moles / 0.100 L
Molarity = 1.88 M
How do silica levels differ between the North Atlantic and North Pacific oceans
Answer:
The highest biogenic silica accumulation rates in this area are observed in the South Atlantic, with values as large as 53 cm. kyr−1 during the last 18,000 yr. Further, extensive biogenic silica accumulation has been recorded in the deep-sea sediments of the Bering Sea, Sea of Okhotsk, and Subarctic North Pacific.
Explanation:
PLS PLS PLS ANSWER THIS ASAP. THISIS DUE IN MINUTES AND I'M FREAKING OUT!!!!!!!!!!!!!!!! I NEED THE WHOLE THING NOT JUST ONE ANSWER. THIS IS WORTH 30% OF MY GRADE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Energy transformations are the processes by which one form of energy is converted to another form.
What are energy transformations?Energy transformations refers to the various ways in which different forms of energy are interconverted.
The given energy transformations are as follows:
Microwaving popcorn: electromagnetic energy to thermal energyWater flowing over a waterfall: potential energy to kinetic energyEating an apple: chemical energy to mechanical energyUsing an iron: electrical energy to heat energyTurning on a car: chemical energy to mechanical energyUsing a flashlight: chemical energy to light energyFireworks on the 4th of July: chemical energy to light energyTurning on the light: electrical energy to light energyPlaying the drum: mechanical energy to sound energyEating a snack before a run: chemical energy to potential energyMaking toast in the toaster: electrical energy to heat energyTurning on a car radio: electrical energy to soundThe Sun: nuclear energy to lightPlant photosynthesis: Light energy tp chemical energyTherefore, energy transformations are the processes by which one form of energy is converted to another form.
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the process of chlorination in water treatment aims at ?
Answer:
Chlorowanie wody jest procesem względnie tanim – koszt zbudowania samej instalacji do dezynfekcji, jak również koszt operacyjny wytworzenia 1 metra sześciennego uzdatnionej chlorem wody jest niższy od dezynfekcji wody za pomocą ozonu. Źródłem chloru w procesie dezynfekcji jest zazwyczaj podchloryn sodu, rzadziej dwutlenek chloru.
Explanation:
192 grams of (NH 4 ) 2 CO 3 (N Molar Mass : 96g ) are dissolved to make 2150 mL of solution , what is the concentration of this solution ?
The concentration of a solution of 192 grams dissolved to make 2150 mL of solution is 0.93M. Details about concentration can be found below.
How to calculate concentration?The concentration of a solution can be calculated by dividing the number of moles of the substance by its volume.
no of moles of NH42CO3 = 192g ÷ 96g/mol = 2 mol
Concentration of solution = 2 moles ÷ 2.15L
Concentration of solution = 0.93M
Therefore, the concentration of a solution of 192 grams dissolved to make 2150 mL of solution is 0.93M.
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Ideal Gas Law Question How many moles of C2H4O are in a 58.953 L container at 467.81kPa and 446.11 °C?
The number of moles of gas in the container would be 4.62 moles
Ideal gas lawAccording to the ideal gas law:
PV = nRT, where P = pressure, V, volume, n = mole number, and R = constant = 8.31
In this case, V = 58.953 L, P 467.81 kPa, and T = 719.11 K
Making n the subject:
n = PV/RT = 58.953 x 467.81/8.31 x 719.11 = 4.62 moles
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HELP HELP HELP PLEASE
The diagram shows the reactants in the chemical reaction when carbon (C) is
combined with hydrogen (H) to produce methane. C + 4H - ??
One in which no heat is allowed to flow into or out of the system?
A. isobaric process
B. adiabatic process
C. isochoric process
D. isothermal process
Type the correct answer in each box.
Balance the chemical equation.
N₂O3-
N₂ +
0₂
The Balanced Reaction is 2N₂O₃⁻ -----> 2 N₂ + 3 0₂
What is a Balanced Reaction ?A reaction in which the number of atoms of each element in the reactant and the product are equal is called a Balanced Reaction .
It is given in the question:
To Balance the chemical equation.
N₂O₃⁻ -----> N₂ + 0₂
To balance the reaction , the number of molecules of each element , i.e. Nitrogen (N) and Oxygen (O) needs to be balanced
2N₂O₃⁻ -----> 2 N₂ + 3 0₂
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Part e
the population census of a city shows that its population has grown in the last decade.
this growth has surpassed the city's ability to provide sufficient water to its people. the
city is located about 10 miles from the ocean and has a dry climate. based on your
research and the list of criteria and constraints from part a, suggest a technology to use
in this city. defend your choice with a valid explanation.
Hydroelectricity is the technology whose growth has surpassed the city's ability to provide sufficient water to its people.
What is technology?Technology is the process of fusing science and the application of skills in scientific industries.
The population can use the waves even the tides of the ocean's water to create electricity which is reliable.
Of course in the beginning it will be expensive but the result will be effective and useful.
The area having a dry climate could be because of the winds that blow precipitating clouds away but they can have a stable climate by planting more trees where rain can be processed within the geographical location.
Finally, the problem of water supply can be fixed by installing water pipes to transport water to the community but in the process, water can be filtered or cleaned to prevent some diseases and social issues/calamities.
Hence, hydroelectricity is the technology whose growth has surpassed the city's ability to provide sufficient water to its people.
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Strong acids and strong alkalis are.......
Able to turn blue litmus paper red
Corrosive and/or caustic
Sour
Sweet
Which of the following pH numbers indicates a strong acid?
1
5
7
14
what is the answer and why?
Answer:
D
Explanation:
There are 2 oxygens on the reactants side (OH)2 but 4 on the products side (2H2O). You cannot get 2 oxygens out of nowhere, so it is not balanced.
Select the correct answer. a student puts a glass of water in the freezer. later, he notices ice forming on the surface of the water. which property of water best explains why ice forms on its surface?
During which phase are two distinct nuclei present.
Answer:
During the completion of mitosis (telophase), two new nuclei form around the separated sets of daughter chromosomes (see Figure 8.29).
Explanation:
Mention two substance that sublines
Familiar substances that sublime readily include iodine , dry ice , menthol, and camphor. Sublimation is occasionally used in the laboratory as a method for purification of solids, for example, with caffeine.
PLS I WILL GIVE BRAINLY How do the number of violence electrons of the light metals compared to those heavier than boron
The valence electron of the light metals are all in the range of 1 to 3.
What are Valence electron ?Valence Electron is the number of electrons in the outer shell of an atom which participate in bond formation.
Number of Valence Electron in Boron is 3 and other light metals lighter than Boron have 1 , 2 of Lithium and Beryllium respectively,
The valence electron of the light metals are all in the range of 1 to 3.
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For which process would the pictured cell be used?
Producing electricity
Splitting a compound into its elements
Purifying a metal
Coating a material with metal
Answer:
Coating a material with metal
(SInce the glasses will be coated with gold.)
If you took 800mg of aspirin tablet at 12:00pm and another 800mg tablet at 2pm, how many milligrams of aspirin are still in your system at 3pm? Aspirin has a t 1/2 of 1 hour.
Which is the electron configuration for zinc?
O 1s²2s²2p 3s²3p64s²3d³
O 1s22s22p 3s23p64s¹3d¹0
O 1s22s22p53s23p64s²3d¹0
O 1s²2s²2p 3s23p64s²3d¹0
The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex]. Hence, option D is correct.
What is an electron configuration?Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.
The atomic number of zinc is 30 therefore The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex].
In simpler form expressed as [Ar] [tex]3d^10 4s^2[/tex]. The electronic configuration shows the distribution of the electrons of an atom or a molecule.
Hence, option D is correct.
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When doing a chin-up, a physics student lifts her 42.0-kg body a distance of 0.25 meters in 2 seconds. what is the power delivered by the student's biceps?
The power delivered by the student's biceps will be 51.45W.
What is Power?
This is defined as the amount of energy converted per unit and the SI unit is Watts.
Power = Energy/time
Force = ma = 42 kg × 9.8m/s² = 411.6N.
Energy = Force × distance
= 411.6N × 0.25m = 102.9J
Power = 102.9J/2s = 51.45W
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