If you use too much solvent, the solution may become too dilute to produce crystals. It is critical to gradually chill the flask in room temperature and finally in ice water.
Impurities will be trapped within the crystal in a hurried crystal formation. In addition, the resultant crystals will be smaller.A solvent is a substance that dissolves a solute, resulting in a solution. A solvent is often a liquid, although it can also be solid, gas, or supercritical fluid. Water is a polar molecular solvent and the most commonly employed solvent by living ; all ions and proteins in a cell are dissolved in water within the cell.Solvents are used in paints, paint removers, inks, and dry cleaning. Organic solvents are used in dry cleaning (for example, tetrachloroethylene); paint thinners (toluene, turpentine); nail polish removers and glue solvents (acetone, methyl acetate, ethyl acetate); spot removers (, petrol ether); detergents (citrus ); and scents.
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A ample of chloroform i found to contain 10. 1 g of carbon, 89. 6 g of chlorine, and 0. 85 g of hydrogen. If a econd ample of chloroform i found to contain 35. 6 g of carbon, what i the total ma of chloroform in the econd ample?
So, the empirical formula will be CHCl3.An ideal anesthetic was originally sought after via the use of the organic chemical chloroform.This substance has a 120.98 g/mol molar mass.
What is chloroform chemical formula?So, the empirical formula will be CHCl3.An ideal anesthetic was originally sought after via the use of the organic chemical chloroform.In 1831, it was initially made.The substance has the formula CHCl3.It is a thick, colorless liquid that has a sweet scent that is widely produced.Compounds of the elements carbon, hydrogen, and chlorine have the empirical formula C2 HCl.The molar mass of this chemical is 120.98 g/mol.It is frequently referred to as "chloroform" because of the molecule's molecular similarity to formic acid (CHOOH) [4].Chloroform can degrade and create dangerous chemicals like phosgene and hydrogen chloride while not being easily flammable.To learn more about chloroform refer
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compare the size of ions to the size of atoms from which they form
Cations are always smaller than the atoms from which they form. Anions are always larger than the atoms from which they form. Ions are usually bigger than the atoms from which they are formed.
When an atom receives or loses electrons, the atom's electron configuration changes, resulting in a net positive or negative charge.
This net charge expands the electron cloud surrounding the nucleus, making the ion bigger in size than the neutral atoms from which it arose. When a metal atom loses one or more electrons to create a cation, it shrinks in size because the positive charge of the nucleus pulls the remaining electrons more strongly.
When a nonmetal atom obtains one or more electrons to create an anion, it normally expands in size.Because of the increasing amount of electrons, the electron cloud surrounding the nucleus grows. It should be noted that this comparison is not absolute and is dependent on the individual factors involved. Some ions are smaller than their neutral atom counterparts, while others are similar in size.
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The complete question is:
Compare the size of ions to the size of atoms from which they form.
If metal X is lower then metal Y in the activity series, then what would happen?
Metal X replaces Metal Y ions in a solution because it is lower in the activity series than Metal Y. It is a single displacement reaction.
Metal X is above Metal Y in the reactivity series when replacing Metal Y from its respective salts.This replacement is guaranteed since X has a greater reactivity power than Y. If it were less than Y, it wouldn't cause a reaction since it wouldn't move Y.
A single replacement reaction, also known as a single displacement reaction, occurs when one element in a molecule is swapped out for another. Starting ingredients are always pure elements combined with an aqueous compound, such as pure hydrogen gas or zinc metal. A new aqueous compound and a different pure element will be produced as products when a replacement reaction takes place. Below is a general representation of a single replacement reaction.
A+B+C→A+CB
Single displacement reaction occurs where metal X replaces metal Y ions in the solution
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Biodiversity hotspots are areas that have been characterized by
A being most threatened areas with high diversity of species
B being located in only one region around the world
C having low diversity of organisms
D are not threatened by human activities and loss of habitat
Answer:
Pretty sure it's A
Explanation:
during the cleaning of a laboratory, the laboratory assistant accidentally dropped a piece of magnesium in the solution. what happened to the magnesium in the solution and write the equation for the reaction
Explanation:
It depends on the solution
If it's water it becomes
Mg + H2O »»» Mg(OH)2 + H2
But if it's any acid it becomes magnesium salt and still liberates hydrogen gas
What i a cenario where it might be important for you to meaure or calculate volume correctly and why
Volume is the amount of space an object takes up. It is typically measured using cubic units, and estimated using a variety of formulas. For example, a rectangular bathtub that is 1 foot tall, 2 feet wide, and 4 feet long will have a volume of 8 cubic feet.
Finding the volume of an object can help us to determine the amount required to fill that object, like the amount of water needed to fill a bottle, an aquarium or a water tank.
How to measure volume“Volume is the measure of the 3-dimensional space occupied by matter, or enclosed by a surface,” according to the National Institute of Standards and Technology’s U.S. Office of Weights and Measures. Simply stated, it is the amount of liquid or gas that will take up a defined space.
Commonly measured in cubic units, the standard unit of volume is a cubic meter. Depending on what you are measuring, you can then break it down into the smaller cubic decimeter—known as a liter—and the cubic centimeter, better known as a milliliter
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48 liters of co2 is kept at -33 degrees Celsius,at what temperature will the volume double
Answer:
The temperature is kept constant. What new volume does the gas occupy? Two hundred liters of gas at zero degrees Celsius are kept under a pressure of 150 kPa.
Explanation:
Oxygen gas is at a temperature of 40°C when it occupies a volume of 2.3 liters.
what is the purpose of adding alum to water during the water treatment process?
The benign liquid alum (aluminium sulphate) is frequently used in water treatment facilities to clear drinking water.
It has been utilised in lakes since the early 1970s to lessen the phosphorus content of the water.
Alum dissolves in water and makes the pollutants in suspension heavier, causing them to settle down more quickly. So, loading refers to the addition of alum.
The most frequent use of alum in water treatment is as coagulants. Impurities were made larger by coagulants so they would settle in the sedimentation tanks. Pathogens found in the water can be killed by alum as well.
It facilitates sludge settlement in the secondary clarifiers, which improves the efficiency of the recycled water treatment process by allowing for the passage of cleaner, less turbid water. Additionally, struvite does not accumulate inside the digesters as a result of the alum in the effluent.
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Is NH3 and BF3 polar?.
[tex]NH_{3}[/tex] and [tex]BF_{3}[/tex] are both polar molecules.
This is because [tex]NH_{3}[/tex] has a net dipole moment due to its asymmetrical arrangement of electron distribution, while [tex]BF_{3}[/tex] has a non-zero dipole moment due to its trigonal planar shape.
[tex]NH_{3}[/tex] has a net positive charge at its central nitrogen atom due to the lone pair of electrons, while [tex]BF_{3}[/tex] has a net negative charge at its central boron atom due to its three bond pairs of electrons.
This difference in charge distribution of the two molecules results in a net dipole moment in each molecule.
In conclusion, [tex]NH_{3}[/tex] and [tex]BF_{3}[/tex] are both polar molecules, but [tex]NH_{3}[/tex] is more polar than [tex]BF_{3}[/tex] due to its asymmetrical electron distribution and higher dipole moment.
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How would I balance this?
The balanced equation would be [tex]16Cr(s) + 3S_8(s) --- > 8Cr_2S_3 (s)[/tex].
Balancing chemical equationA balanced chemical equation will have as many atoms of different elements in the products as in the reactants. In other words, a balanced chemical equation will obey the law of conservation of atoms.
According to the law of conservation of atoms, atoms can neither be created nor destroyed but can be converted from one form to another during the course of chemical reactions.
Following this law, the balanced equation for the reaction would be [tex]16Cr(s) + 3S_8(s) --- > 8Cr_2S_3 (s)[/tex]
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Where are the biggest biodiversity hotspots around the world?
1)Tropical Rain Forest
2)Islands
3)Coral Reef
4)The National Park
Answer: #1 is the awnser
Explanation: trus me
How many moles of NaOH are needed to make with 45 120 mL of 15% (mass/volume) solution?
360 moles of NaOH are needed to make with 45 120 mL of 15% solution.
What is mole ?The term mole is defined as one mole of any substance is exactly equal to its atomic mass or molecular mass. It is expressed in grams.
The mole is also define as the amount of substance of a system which contains as many elementary entities. 1 mole = 6.023 X 10²³
Multiply the molarity by the volume of solution to get the number of moles of solute.
moles of solute = molarity × volume of solution
= 45 × 120 / 15
= 360 moles.
Thus, 360 moles of NaOH are needed to make with 45 120 mL of 15% solution.
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How are the molar masses of molecules determined?.
The molar masses of molecules can be determine by finding the atomic mass of an element on the periodic table and sum every element in the compound.
The mole is typically used by chemists to measure how many atoms or molecules make up a substance. According to Avogadro's number, one mole (abbreviated mol) equals 6.022x10²³ molecular entities. Each element has a unique molar mass based on the weight of 6.022x10²³ of its atoms (1 mole).
Finding the atomic mass of an element on the periodic table will allow you to calculate its molar mass. Sulfur, for instance, has a molar mass of 32.066 g/mol if its atomic mass is 32.066 amu.
Scientists may readily translate between mass, number of moles, and number of atoms using dimensional analysis by understanding the link between the molar mass (g/mol), moles (mol), and particles.
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Is bf3 polar or non polar?.
The B-F bond is polar. In order to understand why BF3 is polar, it is important to first understand its molecular geometry. BF3 has a trigonal planar shape, which means that it has three atoms bonded to a central atom in a flat, triangular arrangement.
In this case, the central atom is boron (B) and the three bonded atoms are fluorine (F).
The B-F bond is polar because Boron has a lower electronegativity than Fluorine. This means that the electrons in the bond will be more attracted to the Fluorine atom, giving it a partial negative charge and the Boron atom a partial positive charge.
This creates a dipole moment in each B-F bond.
Since the three B-F bond dipoles are arranged in a plane with an angle of 120 degrees between them, the dipoles cancel each other out, resulting in a net zero dipole moment and making BF3 a polar molecule.
However, it is important to note that the polarity of a molecule doesn't always depend on the dipole moment, but also on the symmetry of the molecule.
BF3, although has a net zero dipole moment, symmetry is not perfect. The three bond dipoles are arranged in a plane, but they are not equal in magnitude and direction. This creates an overall molecular dipole moment, making BF3 polar.
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The amount of energy required to change 20g of H₂0 to steam is +50 kJ. Calculate the standard heat of vapourization.
The standard heat of vaporization of H₂0 is +2.5 kJ/g.
What is standard heat?The standard heat of formation of a compound is described as the change of enthalpy during the formation of 1 mole of the substance from its constituent elements in their reference state, with all substances in their standard states.
To calculate it, we need to divide the total energy required to change the 20g of H₂0 to steam by the amount of substance being vaporized.
The amount is 20 g
the total energy required = 50kj
Therefore the standard heat of vaporization of H₂0 is 20/50 = +2.5 kJ/g
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Ordinary hydrogen contain 99. 30 of protium atom and 0. 70 deuterium atom. Calculate the atomic number of hydrogen
The atomic number of hydrogen is 1.
Key points:
The atomic number of an element is the number of protons in the nucleus of an atom of that element.Hydrogen is the lightest element and its most common isotope, called protium, has just one proton in its nucleus.A small fraction of hydrogen atoms, about 0.01%, are the isotope called deuterium which has one proton and one neutron in its nucleus.So, the atomic number of hydrogen is 1, regardless of whether it is protium or deuterium.Hydrogen is also the first element in the periodic table and the atomic number is used to arrange elements in the table by increasing atomic number.Learn more about hydrogen here:
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Which term names the result of two or more atoms combined chemically? A. compound B. gas C. element D. reactant
The result of two or more atoms combines chemically is a molecule. A molecule can also be referred as a compound. Hence the answer to the question is Option A.
Any substance or matter that undergoes a chemical change occurring in a given reaction, especially present at the start of the reaction is called a reactant.
A substance or matter in a state in which it expands freely to fill the whole of space as in container, having no fixed shape (unlike a solid) and having no fixed volume (unlike a liquid) is called a gas.
One of a class of substances or components, that cannot be separated or divided into simpler substances by any chemical means is called an element.
A distinctly formed substance formed by chemical union of two or more ingredients/components such as atoms in definite proportion by weight is called a molecule. A molecule is a group or combined state of two or more atoms held together by chemical bonds.
A compound is a substance/matter which is formed by two or more different types of elements/atoms of elements which are united chemically in a fixed proportion.
Thus, All molecules are not compounds. But, All compounds are molecules.
Hence, the correct answer should be Option A i.e. compound.
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Answer:
compound
Explanation:
no.
The modern periodic table arranges the element in order of the increasing
O atomic mass
O atomic number
O mass number
O atomic mass unit
Answer:
atomic number
Explanation:
# of protons
Copper oxide (CuO) i reacted with ulfuric acid (H2SO) to make copper ulfate (CuSO4)
and water (H20). A. Calculate the total relative formula ma (Mr) for the reactant of thi reaction
The total relative formula ma (Mr) for CuO is 79 and H2SO4 is 98
What is relative formula mass?
The total of the relative atomic masses of the atoms represented by the numbers in the formula represents the relative formula mass of a substance composed of molecules.
Copper II sulfate is a cyan-blue chemical that is produced when copper (II) oxide, a black solid, reacts with sulfuric acid. Water and copper (II) sulfate are produced by the reaction of copper (II) oxide with sulfuric acid. This reaction can be categorized as either a neutralization reaction or a double displacement reaction.
CuO(s) + H2SO4 (aq) → CuSO4 (aq) + H2O(l)
Relative formula mass, Mr for:
CuO: 63 + 16 i.e. 79
H2SO4: 1*2 + 32 + 4*16 i.e. 98.
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If 2.09 mol of ethane (C₂H6) undergo combus-
tion according to the unbalanced equation
C₂H6+ O2 CO₂ + H₂O,
how many moles of O₂ is required?
Answer in units of mol. Answer in units of
mol.
Place each noble gas symbol in front of the appropriate partial electron configuration to create an accurate electron configuration.
An electron configuration that is complete up to a certain partial electron configuration must exist in the noble gas that comes before it.
When fully written out exactly before the partial electron configuration, the electron configuration of the noble gas should provide us with a reliable electron configuration for some element.
Our noble gas should at least be in the third period as the highest principal energy level in the first series bears the number 4. (numerically, the energy level is the same as the period number). Argon would be that noble gas. Note: All noble gases have an electron configuration that contains Np6, where N is the greatest main energy level. The partial electron configuration provided is not that of a noble gas.
Therefore, [Ar] serves as the noble gas that suitably comes before our first partial electron configuration.
The electron configuration of argon is1s²2s²2p⁶3s²3p⁶.. By applying the Aufbau Principle, 4s2 would naturally come after 3p6. Writing out t 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p²; is identical to writing [Ar]4s23d104p2, which also happens to be the electron configuration of germanium.
Hopefully, now that we have the basics established, we can use them to determine the noble gases that come before the remaining partial electron configurations.
Iodine's electron configuration is [Kr]5s²4d¹⁰5p⁵
The electron configuration of fluorine is [He]2s²2p⁵
Lead's electron configuration is [Xe]6s²4f¹⁴5d¹⁰6p²
Magnesium's electron configuration is [Ne]3s²
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Complete Question -
Place each noble gas symbol in front of the appropriate partial electron configuration to create an accurate electron configuration.
Pleaseee help now ASAP nowww please help
Phosphorous at 18.9%. According to analysis, sodium, phosphorus, and oxygen make up 42.1%, 18.9%, and 39% of sodium phosphate, respectively.
What is the short definition of percentage composition?The ratio of the amounts of each element to the sum of the individual element amounts present in the compound, multiplied by 100, is the definition of the percentage of a given compound. In this instance, the quantity is expressed in grams of the constituent ingredients.
What distinguishes mass percent from percent composition?The proportional mass of each component of a compound is known as the percent composition. The mass percent of a compound is the weight of an element expressed as a share of the complex's overall mass. For instance, a molecule of water has a structure of one oxygen atom and two hydrogen atoms.
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Is CCl4 a polar covalent bond?.
CCl4 is a nonpolar covalent bond.
This is because the molecule has a symmetrical shape, with the four chlorine atoms arranged around the central carbon atom in a tetrahedral formation. Because the electrons are distributed evenly around the central atom, there is no partial charge on any one side of the molecule, making it nonpolar. As a result, the electrons are evenly distributed among the atoms, resulting in no partial charges. This creates a nonpolar bond because there is no separation of charge, meaning the bond is neutral and has no dipole moment. Additionally, chlorine is more electronegative than carbon, so the electrons are pulled closer to the chlorine atoms, further contributing to the nonpolar nature of the bond.
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____a region in an atom where there is a high probability of finding electrons
Atomic orbitals are places on an atom where there is a very high chance of finding electrons. Electrons are located in the area termed the electron cloud that surrounds the nucleus of an atom.
The set of primary particles that comprise an atom includes many other particles than the electron. Like other elementary particles, electrons can collide with other particles and, when they are diffracted, exhibit wavelike characteristics. Atomic orbitals are places on an atom where there is a very high chance of finding electrons. A chemical element is made up of an atom, which is the smallest building block of ordinary matter. Every substance—solid, liquid, gas, and plasma—is made up of neutral or ionised atoms. The average atomic diameter is 100 picometers or less.
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How many molecules are present in 64g of SO2?.
To calculate the number of molecules present in 64 grammes of SO2, you first need to know the molar mass of SO2. The molar mass of SO2 is 64.06 g/mol.
Then, you can use the formula: moles = mass divided by molar mass
So, SO2 moles = 64/64.06
The molecular weight of SO2 is approximately 0.998.
Then, you can use Avogadro's number, which is 6.022 x 1023, to calculate the number of molecules:
Molecules = moles multiplied by Avogadro's number
So, molecules of SO2 = 0.998 x 6.022 x 1023
The number of molecules of SO2 present in 64 grammes is approximately 6.00 x 1023.
Note: This is an approximation because the real number of molecules present in 64 g of SO2 can be affected by experimental errors or other sources of uncertainty.
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Helppppppppppppppppppppppppppppp
Answer:
বোকাচোদা মাণ্ডু খানকির ছেলে চোদাচুদি করে
Is chcl3 polar or nonpolar?.
Chloroform ([tex]CHCl_{3}[/tex]) is a polar molecule due to its asymmetrical shape.
The asymmetrical shape of the molecule [tex]CHCl_{3}[/tex] arises from the presence of the chlorine atom, which has a higher electronegativity than the hydrogen atoms.
This results in the chlorine atom having a partial negative charge and the hydrogen atoms having a partial positive charge.
This unequal distribution of charge gives the molecule a permanent dipole moment, making it a polar molecule and hence chloroform is not a nonpolar molecule.
Additionally, due to the large difference in electronegativity between the chlorine and hydrogen atoms, the molecule exhibits significant dipole-dipole intermolecular forces, which further reinforces its polarity.
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T/F All amino acid based hormones are lipid soluble and can cross the plasma membrane.
False All the amino acid based hormones are not lipid soluble and can not cross the plasma membrane.
Amino acid-derived as well as polypeptide hormones are water-soluble and insoluble in lipids. These hormones cannot pass through the plasma membranes of the cells; therefore, their receptors are found on the surface of the target cells.
Amino acids are those molecules which will combine to form proteins. When the proteins are digested or broken down, amino acids will be left. The human body uses amino acids to make proteins to help out the body: Repair body tissue, Grow, and Perform many other body functions.
Amino acids are also be used as a source of energy by the body.
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Phosphorous at 18.9%. According to analysis, sodium, phosphorus, and oxygen make up 42.1%, 18.9%, and 39% of sodium phosphate, respectively.
What is the short definition of percentage composition?The ratio of the amounts of each element to the sum of the individual element amounts present in the compound, multiplied by 100, is the definition of the percentage of a given compound. In this instance, the quantity is expressed in grams of the constituent ingredients.
What distinguishes mass percent from percent composition?The proportional mass of each component of a compound is known as the percent composition. The mass percent of a compound is the weight of an element expressed as a share of the complex's overall mass. For instance, a molecule of water has a structure of one oxygen atom and two hydrogen atoms.
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If motion can produce electric currents from a magnetic field, how could magnets on a railroad provide electricity to a train?
Magnets on a railroad provide electricity to a train by electrifying the propulsion loops generates magnetic fields that both pull the train forward from the front and push it forward from behind.
What is a magnetic field?A magnetic field is described as a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.
Electrodynamic suspension (EDS) uses superconducting electromagnets or strong permanent magnets that create a magnetic field, this magnetic field induces currents in nearby metallic conductors when there is relative movement and hence pushes and pulls the train towards the designed levitation position on the guide way thereby providing electricity.
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