An obvious physical difference between saturated and unsaturated fats is saturated fats are usually solids while unsaturated fats are usually liquids. (C)
Saturated fat and unsaturated fatStructurally, saturated fat is a type of fat in which the fatty acid chains have all or mainly single bonds. While unsaturated fats have loose bonds so that these fats are liquid at room temperature.
Saturated fats are fatty acids that have only one single bond in their molecule. Saturated fats are solid at room temperature because their chemical chains are dense and without gaps.
Unsaturated fats are fatty acids that have one single bond and one double bond in their molecule. The double bonds in unsaturated fats create gaps so that unsaturated fats are liquid at room temperature.
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The density of solid cu is 8. 96 g/cm3. How many atoms are present per cubic centimeter (cm3) of cu?.
The number of atoms of Cu is 8.49 × 10²² atoms/cm³.
In one cubic centimeter, there are 8.96 grams of Cu. (given data)
The number of atoms of Cu is, therefore:
Density = Number of atoms (N) per unit cell Atomic weight / Avogadro number x (Lattice constant)³
N = 8.96g/cm³ × (1mol / 63.546 g) × (6.02 × 10²³ atoms/ 1 mol)____eq.1
[Molar mass of copper = 63.546g]
[Avogadro Number = 6.02 × 10²³]
On solving the above equation 1, we get:
N = 8.49 × 10²² atoms/cm³
Hence, the number of atoms of Cu is 8.49 × 10²² atoms/cm³.
What is a unit cell in a solid state?
A unit cell is the most basic and least volume-consuming repetitive form of any material. It is used to visually deconstruct the solids where crystalline patterns self-organize. Because the unit cell repeats, the network is referred to as a lattice.
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Need help with this salt chapter
For each of the given salt preparations, the method and additional reagent needed for the preparation as well as the complete equation of the reaction is given below:
(i) The soluble salt copper (II) sulfate, from the insoluble base, copper (II) oxide:
Method: add an excess of base or metal to dilute acid and remove the excess by filtration
Reagent: copper (ii) oxide and sulfuric acid
Word equation: copper (ii) oxide + sulfuric acid --> copper (ii) sulfate + water
(ii) The soluble salt, potassium chloride, from soluble base potassium hydroxide;
Method: use a burette and indicator;
Reagent: potassium hydroxide and hydrochloric acid
Symbol equation: KOH + HCl ---> HCl + H₂O
What are salts?Salts are compounds that are formed when all or some of the ionizable hydrogen of acids are replaced by metallic ions.
Depending on the nature and solubility of a salt, there are three methods of preparing salts.
Method A-- use a burette and indicator; for soluble salts
Method B----mix two solutions and obtain the salt by precipitation; for insoluble salts
Method C- add an excess of base or metal to dilute acid and remove the excess by filtration; for soluble salts.
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what causes the name for the molecular structure to be different from the name for the arrangement of electron pairs?
The name for the molecular structure is different from that of the electron pairs when there are lone pairs around the central atom. When there are no lone pairs on the central atom in the structure.
What is Lone Pair?
Atoms' outermost electron shell contains lone pairs.
Lone pair effect, to put it simply, is what happens when an atom, ion, or the area around an atom in the middle of a molecule totally shares an unshared pair of electrons.
A lone pair reduces the binding angle between atoms that are bonding in pairs. This is because the lone pair's highly charged electrons strongly repel one another due to its high electrical charge.
The development of coordination bonds is aided by this.
Contrast this with the inert pair effect if you must. We also need to understand about the Inert Pair Impact, which is a crucial effect in chemistry. In compounds that belong to post transition metals, the inert pair effect refers to the propensity of the s-electrons in the valence shell to stay unshared or not participate in reactions.
The electrons are not effectively protected by the d or f orbitals. As a result, the nucleus holds the s-orbital electrons more firmly. As a result, the inert pair effect grows across the group.
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A chemist mixed two substances together: a blue powder with no smell and a colorless liquid with a strong smell. Their repeating groups of atoms are shown above on the left. After they were mixed, the chemist analyzed the results and found two substances. One ending substance had the repeating group of atoms shown above on the right.
Is the ending substance the same substance as the blue powder? What happened to the atoms of the starting substances when the ending substances formed?
The mixing of the two chemicals results in changes in the chemical properties and the arrangement of the atoms in the chemicals.
The atoms of the starting substances are turned into the atoms of the finishing substances as the initial substances combine and transform into new compounds. The atoms of the starting substance get mixed with the other substance resulting in changing the physical and chemical properties of the substance.
What are mixture of substances?In chemistry, a mixture is a compound made up of two or more simpler substances. Chemical elements or compounds may qualify as such materials. A combination of liquids, solids, or gases can be created. When sugar is added to water, for instance, it first creates a mixture before dissolving to produce a solution.
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period of repolarization of the neuron during which it cannot respond to a second stimulus
The period of repolarization of a neuron during which it cannot respond to a second stimulus is known as the refractory period. It typically lasts for about 1-2 milliseconds.
The Refractory Period: How Neurons Reset and Respond to StimuliThe refractory period is a crucial part of the neuron's normal functioning. This period of time allows the neuron to recover from the initial stimulus and reset itself before it can respond to a second stimulus. During the refractory period, the neuron's voltage and other properties return to their resting state, allowing it to be responsive to a second stimulus. This short period of time typically lasts for 1-2 milliseconds, after which the neuron can respond to a second stimulus.
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draw the lewis structure for xenon tetrafluoride (xef4). how many valence electrons surround the central xe atom in this structure?
36 valence electrons surround the xenon atom in XeF4.
What is Lewis structure?
The valence shell electrons in a molecule are represented in an excessively simple form by a Lewis Structure. It is used to illustrate how the electrons in a molecule are placed around specific atoms.
Through using present periodic table, we first count the valence electrons present in the XeF4 molecule. Once they have been determined, we can arrange them around the main atom and attempt to fill each atom's outer shell. Thus, there are 8 + 4 * 7 = 36 valence electrons in XeF4. In order to obtain the optimum Lewis structure for the molecule, formal charge is taken into consideration. Remember that fluorine (F) cannot form a double bond because of its highly electronegative nature, and that xenon (Xe) can contain up to 8 valence electrons.
Therefore, 36 valence electrons surround the xenon atom in XeF4.
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What patterns do you see between the number of energy levels and placement on the periodic table of elements?
The patterns do you see between the number of energy levels and placement on the periodic table of elements is filling of each energy levels with the electrons and placement of the element is depend on atomic no.
The elements in the period table is placed according to increase in the atomic number. the elements are arranged in the periodic table according to the increases in the atomic number. the felling of the each energy level with electrons in the repeating pattern across the period of the periodic table.
Thus, the position of the element in the periodic table is determine by the number protons in the atoms nucleus.
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Given that S is the central atom, write a Lewis structure of OSF4 in which the formal charges of all atoms are zero.
A Lewis structure is a schematic illustration of a compound that shows the atoms and their associated electrons.
What does OSF4's Lewis structure look like?
14 lone pairs in total make up the OSF4 Lewis structure.
Since every electron in S participates in bonding,
there are no lone pairs in the molecule. Since the oxygen atom shares two electrons with the sulphur atom, there are only two lone pairs left in oxygen. Each F holds three lone pairs and contributes one electron to sulphur.
What atom in osf4 is the main one?
S will be our main atom as a result.
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Opium can best be described as __________. A. A type of tea that was popular in britain in the 1800s b. A plant that was used to make blue dye c. A powerful, addictive narcotic drug d. A type of woven cotton cloth with a colorful design please select the best answer from the choices provided a b c d.
Opium can best be described as a powerful, addictive narcotic drug.
Opium is a highly addictive narcotic substance that is extracted from the dried seed pod of the opium poppy (Papaver somniferum). The morphine alkaloid in opium is the source of heroin.
The dosage and method of administration of opium determine how strong its euphoric effects are on the brain. Because the opiate molecules travel into the lungs and are swiftly absorbed and then transported to the brain when smoked, it takes effect immediately. Users of opium report feeling a euphoric surge, then relaxation and relief from physical discomfort. This "high" is quite similar to that of heroin. Opium use leads to physical and psychological dependence and can lead to overdose.
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when a lead storage battery is discharged, metallic lead and lead(iv) oxide are involved. based on oxidation numbers, which of these is the cathode, and which is the anode?
When a lead storage battery is discharged, metallic lead and lead(iv) oxide are involved then anode is Pb and cathode is PbO (lead Oxide).
A metal is any of a group of substances with high thermal and electrical conductivity, malleability and ductility, and high light reflectivity. Metals make up roughly 75% of all chemical elements that are currently understood. In the Earth's crust, aluminium, iron, calcium, sodium, potassium, and magnesium are the most prevalent elements. Some metals, such as copper, gold, platinum, and silver, are frequently found in the free state, though, as a result of the fact that they do not easily react with other elements. Ores contain the majority of metals (materials that contain minerals). Typically, metals are crystalline solids. They typically have a highly symmetric crystal structure with a compact atom packing that is simple to understand.
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in a mixture of 1.20 mol of gas, 0.50 mol are nitrogen (n2) molecules. what is the mole fraction of n2 in this mixture? report your answer using two significant figures.
The number of moles of a component divided by the sum of the moles of all the components in a mixture is known as the mole fraction mf = na/nm applies to a two-component mixture.
The difference between na and nm is the number of moles of each component in the combination.
Given a mixture of gases with moles equal to 1.20 mol and molecules of nitrogen (n2) at 0.5 mol,
This mixture's mole fraction of n2 is = 0.5/1.2 = 0.40.
As a result, mole fraction is 0.40.
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Naomi has increased the pressure on a solution of liquid and gas in a closed container. What will this do to the gas in her solution?increase the amountdecrease the amountincrease the temperaturedecrease the temperature.
Naomi has increased the pressure on a solution of liquid and gas in a closed container, This will increase the amount of gas held in her solution.
When Naomi raises the pressure on a closed container containing a solution of liquid and gas, the result will be an increase in the volume of gas that is contained within the solution. Gases dissolve better under pressure. In the beginning, the particles that make up the gases were very far away from one another.
They move around randomly and never stay in the solution. An increase in their pressure causes the gases to collide with the solution more frequently. Because of this, the amount of gas that may be contained in a solution will increase.
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enter nuclear equations to represent this process: first the bombardment of u-238 to form u-239 , then the first beta decay of u-239 , and finally the second beta decay to form pu-239 . express your answers as a series of three nuclear equations separated by commas. nothing
First the bombardment of u-238 to form u-239 , then the first beta decay of u-239 , and finally the second beta decay to form pu-239.
When an atomic nucleus undergoes beta decay, a fast, energetic electron or positron known as a beta particle is released, converting the original nuclide into an isobar of that nuclide. For example, in the process known as "positron emission," a proton is converted into a neutron by the emission of a positron and a neutrino, whereas in the process known as "beta decay," a neutron is converted into a proton by the emission of an electron and an antineutrino. Both the beta particle and the associated (anti-)neutrino are not existing in the nucleus prior to beta decay; rather, they are created during the decay process. This process results in a more stable proton-to-neutron ratio for unstable atoms. The binding energies of all identified nuclides combine to produce the nuclear band, commonly referred to as the valley of stability. [1] For either electron or positron emission to be energetically possible, the energy release, or Q value, must be positive. Beta decay is caused by the weak force, which has relatively long decay times. The weak force allows up and down quarks, which make up nucleons, to alter the flavor of their lepton by producing a W boson, which results in an electron/antineutrino or positron/neutrino pair.
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In subtractive color mixing, like with ink on paper, when all three primary colors are combined the result is?
Subtractive colors mixing with all three primaries will result in black.
How are the 3 primary subtractive colors combined?Adding all three subtractive primary color filters together will absorb all the colors of the white light spectrum as appeared below. Each filter (or pigment) absorbs its harmonizing color and transmits (diffusely reflects) the others.
Primary colors union of these three results in white. The subtractive primary colors are related to the subtraction of light: cyan, magenta, and yellow, the colors used in four-color printing, the union of these results in black.
So we can conclude that the usually used subtractive primary colors are cyan, magenta, and yellow, and if you overlap all three in a successful equal mixture.
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If the bond angle between two adjacent hybrid orbitals is 109.5°, which is the hybridization?
a. Sp2
b. Sp3d
c. Sp3
d. Sp
sp³ Hybridization is present when the bond angle between two adjacent hybrid orbitals is 109.5°.
The process of combining the characteristics of one 2s orbital and three 2p orbitals to produce four hybrid orbitals with similar properties is known as "sp³ hybridization." An atom needs an s orbital and three p orbitals in order to be sp³ hybridized. Electron repulsion is decreased in this configuration. Four sp³hybrid orbitals are produced when one s orbital is hybridized with all three p orbitals. The binding angle between the sp³ hybrid orbitals is 109.5 degrees. The stronger the connection, the shorter the bond, and the closer the electrons are bound to the nucleus, the higher the s-character. In comparison to sp² and sp hybridized atoms, sp³ hybridized atoms thus form longer and weaker connections.
Hence, option c. sp³ is the correct answer.
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A pure substance which can only be separated into two or more simpler substances using chemical changes is called
Answer: Compound . Chemical reactions can divide elements into simpler substances, but they cannot separate elements into simpler substances. Physical or chemical characteristics of substances can be categorised.
Compounds and elements can be created from pure substances. A chemical reaction is required to break down pure substances (elements and compounds) into their component atoms or elements. This is known as the chemical separation process. Physical separation of pure substances is impossible.
Explanation:
What makes something pure substance?
One element or a small number of related compounds make up pure substances. Mixtures are assemblages of many components. Mixtures of two or more substances (or elements) that cannot be visually distinguished from one another are referred to as homogeneous mixtures.
What sort of compound would that be?
A substance made up of two or more components is called a compound. Table salt, water, and carbon dioxide are a few examples of compounds
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A solute is dissolved in a liquid. how does the osmotic pressure of the solution compare to the osmotic pressure of the pure liquid?
The concentration of the solution rises as more and more solute is dissolved in the solvent. The osmotic pressure of the solution rises with the increase in solution concentration. As a result, solution has a higher osmotic pressure than pure solvent.
What connection exists between solute concentration and osmotic pressure?The quantity of solute particles in a solution affects the osmotic pressure of that solution. The amount of solute particles in a liquid is directly proportional to the osmotic pressure, hence the higher the osmotic pressure, the more solute particles there are in the liquid.
Temperature and concentration both have an impact on osmotic pressure. Temperature and solute concentration both have an impact on how much pressure is produced.
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which contains more alcohol, 80 proof whiskey or the same volume of vodka that is 35 percent alcohol by volume?
Among the following, whiskey contains more alcohol.
What is alcohol?
Most beverages include alcohol, which is what makes you intoxicated. Alcohol found in beverages is known as ethanol (ethyl alcohol). It is created when the carbohydrates in grains, fruits, and vegetables are fermented by yeast.
Whisky and comparable spirits often have an alcohol by volume (ABV) of 35 to 40%, which is higher than most other alcoholic beverages. In contrast, the ABV of beer is typically approximately 5%.The alcohol content of whiskey can vary greatly between brands and varieties, like it does with many other spirits. Check the label of your drink for the ABV or ask your server before placing an order to see how much alcohol is in it. If your whisky has a 40% ABV, it signifies that 40% of the alcohol is in its purest form.Therefore, whiskey contains more alcohol.
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what is the electron pair geometry for an ammonia molecule, nh3? question 7 options: a) linear b) bent c) trigonal pyramidal d) tetrahedral e) none of the above
Answer:
c) Trigonal pyramidal
Explanation:
Since NH₃ contains a nitrogen atom bonded to 3 hydrogen atoms with a lone pair, its molecular geometry is trigonal pyramidal. If it weren't for the lone pair, its molecular geometry would be trigonal planar, but with the lone pair there is more repulsion between the electrons (because they have negative charges. Remember: opposites attract), so the bonds are pushed down into a more pyramidal shape.
Remember, its electron domain geometry is tetrahedral, because the electrons are located in 4 different features of the molecule: the 3 bonds and the 1 lone pair.
during extraction of caffeine two layers were formed. how do you determine, (provide 3 different ways), which layer is aqueous and which layer is organic.
To determine which layer is aqueous and which layer is organic during the extraction of caffeine :-
1. Add water to the two layers.
2. Another option is to look for density values for the two solutions. When extracting caffeine, we usually use dichloromethane as a solvent to extract the caffeine.
3. Another method is to measure the volume of each layer.
Extraction of caffeine : Caffeine is water soluble, but boiling tea leaves produces tannins and gallic acid. Two components of the latter can be converted into water-insoluble calcium salts. Caffeine can be extracted from water in almost pure form by methylene chloride.
The purpose of this study was to determine caffeine levels in well-known types of tea and coffee.
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What periodic patterns do you notice for the charges on the ions?
According to the periodic table's ionic charge trend, elements tend to produce cations on the left and anions on the right.
A positive or negative charge on an atom is known as an ionic charge. The charge is affected by the atom's electron configuration as well as the number of valence electrons.
Elements in the same group on the periodic table have an equal number of valence electrons. Therefore, they typically have the same ionic charge. Cations, or positive ions, are typically formed by atoms that can be found on the left side of the periodic table.
On the right side are the atoms that produce anions, which are neagtive charges. The periodic table's outermost elements have smaller charge values, which rise as you get closer to them.
So, The ionic charge trend of the elements on the periodic table shows that they tend to form cations on the left and anions on the right.
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What is conserved in the reaction shown? N_2(g)+3F_2(g)→2NF_3(g)?
The conserved in the reaction shown :
N₂(g) + 3F₂(g) ----> 2NF₃(g) is the mass is conserved.
According, to the law of conservation of mass : the mass neither be created nor be destroyed.
N₂(g) + 3F₂(g) ----> 2NF₃(g)
the mass of N₂ = 28g
the mass of 3F₂ = 114g
the mass of 2NF₃ = 142 g
N₂(g) + 3F₂(g) ----> 2NF₃(g)
28 g 114 g 142 g
28 g + 114 g = 142 g
142 g = 142 g
Thus, the mass of the reactant is equal to the mass of the product. the equation follow the law of conservation of mass as the mass of the reactant is equal to the mass of the product.
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In terms of heat energy transfer, what happens when you place a metal spoon into a bowl of hot soup?
While it is difficult to see, the water molecules somewhat slow down as they collide with the spoon and accelerate its atoms. As a result, the spoon warms up when energy is transferred from the water, while the water cools.
What is energy ?In order to accomplish work and to produce heat and light, energy must be transferred to a body or to a physical system. Energy is the quantitative attribute that does this. Energy can be transformed in form but cannot be created or destroyed, according to the rule of conservation of energy.
The end of a metal spoon quickly becomes warm when it is plunged into a cup of boiling water. Conduction is the mechanism that moves heat along the spoon.
Due to the spoon's cooler temperature than the soup and its proximity to the hotter soup, heat is transferred through the spoon. Conduction is the term for this kind of heat transfer.
Thus, the spoon warms up when energy is transferred from the water, while the water cools.
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rank from highest to lowest boiling point. to rank items as equivalent, overlap them.
The rank from highest to lowest boiling point is given below
Greatest -> Least
1) paraffin, C25H52
2) hexadecane, C16H34
3) octane, C8H18
4) 2,2,4-trimethylpentane, C8H18
5) propane, C2H8
What is the boiling point about?The boiling points point is the temperature at which the vapor pressure is equivalent to the average atmospheric pressure at sea level. A liquid's boiling point changes depending on the pressure that is applied (760 mm [29.92 inches] of mercury). Water boils at 100° C (212° F) at sea level.
Therefore, based on the above, from highest to lowest point, the hydrocarbons are: paraffin, nonadecane, pentane, 2, 2-dimethylpropane, and propane.
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See full question below
Place these hydrocarbons in order of decreasing boiling point. Rank from highest to lowest boiling point. To rank items as equivalent, overlap them.
hexadecane, C16H34
paraffin, C25H52
octane, C8H18
2,2,4-trimethylpentane, C8H18
propane, C2H8
The amygdala causes us to compare current events to past events and then to respond
The amygdala causes us to compare current events to past events and then to respond as we learned to respond to the past event.
What is the amygdala?The amygdala is a structure located in the brain, more specifically in the temporal lobe, which is a set of neurons that will be part of the limbic system which will have the function of processing and storing emotions and modulating emotion. memory.
The amygdala is seen more related to the reaction to fear, since it can respond to a neutral stimulus with various emotions associated with memories that it may have of the stimulus that certain emotions have caused in the past. This shows us that the amygdala has emotional conditioning and learning to neutral stimuli in order to know how to react in the future in the same way and avoid stressful situations.
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How much salt dissolves in 100 ml of water at 20 C?
The salinity of seawater in the world's oceans is typically 3.5% or 35 parts per thousand. This indicates that there are 35g of dissolved salts in every 1lit of salt water, the majority of which, but not totally, is NaCl.
The saltiness or quantity of dissolved salt in a body of water is known as salinity (see also soil salinity). It is often measured in grammes per litre (g/L) or kilogrammes (g/kg; the latter is dimensionless and equal to ).
Salinity, a thermodynamic state variable governed by temperature and pressure, along with other physical properties like density and heat capacity of the water, plays a significant role in regulating many aspects of the chemistry of natural waters and biological processes occurring within them. Conceptually straightforward but technically difficult to describe and quantify properly is salinity in rivers, lakes, and the ocean. Conceptually, salinity refers to how much-dissolved salt is present in the water.
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Which of the following represents a physical change?
• A. Bonds forming
B. Atoms rearranging
. c.
Phase changing
O D. Bonds breaking
For each of the following properties whether f and br
A,electronegavity
B,atomic radius
C,ionization energy
Why does atomic radius increase across period 2?
For all elements in period 2, as the atomic number increases, the atomic radius of the elements decreases.
The contraction of atomic radii across the period. While as we add to Z (the number of protons in the nucleus), we also add another electron (and the charge is therefore kept neutral), the increased nuclear charge acts disproportionately on the valence electrons, and contracts this shell.
Atomic radius is defined as the distance from the centre of the nucleus of the atom to its outermost shell.
Atomic radius decreases across a period because valance electrons are being added to the same energy level at the same time the nucleus is increasing in protons. The increase in nuclear charge attracts the electrons more strongly, pulling them closer to the nucleus.
As we move across a period from left to right, the atomic radii decreases gradually. In a period, there is gradual increases in the nuclear charge from left to right. As the atomic number increases in a period, the electron enters in the same shell. Thus, they are more and more strongly attracted towards the nucleus. As a result of this force of attraction from the nucleus, the atomic radii gradually decreases.
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A student dissolves 15 grams NaCl in 100 grams water at 20 oC. How much more salt must be added to make the solution saturated?
There is a golden role of solubility, polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, the solution to be saturated the mass of salt must be greater than 36.0 g.
What is solution?Solutions are a homogeneous mixture of two or more substances. A solution is a homogeneous mixture of solvent and solute molecules. Solvent is a substance that is in large amount in solution. solute is the substance which is in small amount in a solution.
The solubility of sodium chloride in water is 36.0 g per 100 g of water. which means that sodium chloride solution will contain 36.0 g of dissolved salt for every 100g of water. The solution will be unsaturated because of the less potassium nitrate. The solution to be saturated the mass of salt must be greater than 36.0 g.
Therefore, the solution to be saturated the mass of salt must be greater than 36.0 g.
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