Suspensions are similar to colloids in that they are both heterogenous mixtures and are not true solutions.
Suspensions differ from colloids in that the particle sizes are larger and settle when left to stand.
Some examples of suspensions are smoke and dust particles in the air.
What are suspensions and colloids?Suspensions are a heterogeneous mixture of substances in which one substance is dispersed or distributed throughout a second phase. The particles of a suspension when left to stand will settles over time.
Some examples of suspension are dust particles dispersed in air, a gas.
Other suspensions may be solids dispersed in liquids such as in milk of magnesia.
Colloids or false solutions are a heterogeneous mixture of substances that are dispersed throughout a second medium and in which the particles do not settle when left to stand. The articles of a colloid can not be seen with the unaided eye.
Examples of colloids are gels, emulsions, and sols.
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do xe gas atoms experience attractions to each other? if so, how do these attractions compare to the attractions between kr atoms.
Xe gas atoms do experience attraction to each other, that is called a London dispersion forces. Compared to Kr gas atoms, Xe has stronger London dispersion forces, thus Xe is more difficult to boil.
What is London dispersion force?London dispersion force is an intermolecular force, the weakest force that is only temporarily active when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles. London dispersion forces strength is very dependent on the molecular weight. Xe has heavier molecules than Kr, so Xe also has stronger London dispersion forces. As a result, Xe is more difficult to boil than Kr.
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12. What is the internationally accepted system for measurement called? Imperial System of Measurement National System of Units O International System of Units (SI) U.S. Customary System of Measurement
Internationally accepted system for measurement called as international system of units (SI)
The international system of unit (SI) is commonly known as the metric system and is the international standard for measurement and the international treaty of the meter was signed in Paris on may 20 1875 by seventeen countries including the united states and is now celebrated around the globe as world metrology day and long the dominant measurement system used in science
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What are the 3 main features of a eukaryotic cell?.
Eukaryotic cells, in contrast to prokaryotic cells, have a membrane-bound nucleus. multiple rod-shaped chromosomes, a large number of membrane-bound organelles, including the golgi apparatus.
What is a eukaryotic cell example?Eukaryotic cells are distinguished by their membrane-enclosed organelles and organized nucleus. Plants, animals, fungus, and protists are a few examples of eukaryotic cells. Their genetic material is organized by chromosomes.
What is a eukaryotic cell's primary purpose?Within eukaryotes, organelles perform specialized tasks such power generation, photosynthesis, and membrane synthesis. The majority of them are membrane-bound organelles that serve as the locations of particular metabolic reactions. The presence of a nucleus encircled by a sophisticated nuclear membrane characterizes eukaryotic cells.
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A mixture of nitrogen, oxygen, fluorine, and neon are in a container which has a tiny, tiny pinhole leak. Which element leaks the slowest from the container?.
A mixture of nitrogen, oxygen, fluorine, and neon are in a container which has a tiny, tiny pinhole leak. The element leaks the slowest from the container is fluorine.
The effusion of gas is expressed as follows :
rate ∝ 1 / √M
rate of effusion is inversely proportional to the square root of molecular weight.
molecular weight of nitrogen = 14amu
molecular weight of oxygen = 16 amu
molecular weight of fluorine = 19 amu
the rate of effusion with increase of molecular weight. so the elements leaks the slowest from the container is fluorine.
Thus, A mixture of nitrogen, oxygen, fluorine, and neon are in a container which has a tiny, tiny pinhole leak. The element leaks the slowest from the container is
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what's the frequency of a microwave thats 6 cm in length
Which statement describes the particles that make up a raindrop?
Question 3 options:
They stay close together and vibrate in place.
They are far apart and move freely from one place to another.
They stay close together and slip past one another.
They are far apart and bounce off one another.
The statement that describes the intermolecular forces in the raindrop is that; they stay close together and slip past one another.
What are intermolecular forces?The term intermolecular forces has to do with the kind of force that holds the molecules of a substance together. There are several kinds of intermolecular forces and the strength of the bond depends on the kind of the interaction that goes on.
In this case, we have a rain drop. We have to know that the rain drops are liquids and the intermolecular forces in liquids is such that the molecules are able to slide past each other.
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Fill in the coefficients that will balance the following reaction: KI + Pb(NO3)2 → PbI2 + KNO3
Answer:
2KI + Pb(NO3)2 = PbI2 + 2KNO3
Explanation:
To make a chemical equation to be balanced,two things would be a factor:
1.The same radicals on both side of equation.
2.The radical on only one side of equation.
Since the equation has radicals on both side,we count it as one unit.Then balance the most complex,Pb(NO3)2 and KNO3 in this case,and the least complex on the last.
I know thst it is really hard at first to solve it but follow the instuction carefully.
Please rate it,Thanks.
hydrogen, , is used as a rocket fuel. the hydrogen is burned in oxygen to produce water vapor. what is the enthalpy change per kilogram of hydrogen?
The enthalpy change per kilogram of hydrogen is -120 kJ/ g H2
What is enthalpy of a reaction?
A chemical reaction's change in enthalpy that takes place under a constant pressure is known as the "heat of reaction" or "enthalpy of reaction." It is a helpful thermodynamic unit of measurement for figuring out how much energy per mole is emitted or created during a reaction. Enthalpy is a state function as well because it is created by pressure, volume, and internal energy, all of which are state functions.
The reaction is,
2H2(g)+O2(g) = 2H2O(g) H=-484 kJ
The molar weight of hydrogen, which is represented in the equation as H2, is 2.02 g/mol. According to the equation, 2 mol of H2 produce 484 kJ of heat. The heat evolved per gram of hydrogen is calculated by dividing this by the 2 mol H2 and the 2.02 g/mol H2:
(-484 kJ/2 mol H2)(1 mol H2/2.92 g H2) = -120. kJ/g H2
Hence, the enthalpy change per kilogram of hydrogen is -120 kJ/ g H2
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Billy drops a baseball out of the window of his apartment at what point does the ball have the most kinetic energy?
(A) before he drops it
(B) halfway to the ground
(C) right as he drops it
(D) right before it hits the ground
Select the correct answer. which of these actions is an example of chemical weathering? a. freezing water widens the cracks in rocks. b. plant roots force their way into cracks in rocks and break them. c. oxygen in air reacts with iron content in rocks, causing them to change color. d. strong winds peel soft rock away, leaving harder rock behind.
Which of these actions is an example of chemical weathering?
a. freezing water widens the cracks in rocks.
b. plant roots force their way into cracks in rocks and break them.
c. oxygen in air reacts with iron content in rocks, causing them to change color.
d. strong winds peel soft rock away, leaving harder rock behind.
In water, a substance that ionizes completely in solution is called a? semiconductor nonelectrolyte weak electrolyte nonconductor strong electrolyte
A Strong Electrolyte in water is a chemical that totally ionizes in solution. An electrolyte that absorbs almost entirely in water is said to be a strong electrolyte.
Strong electrolyte: What is it?A solution or solute that totally, or nearly completely, ionic compounds or decomposes in a solution is referred to as a strong electrolyte. In the solution, these ions act as effective conductors of electric current. A substance that is a good electrical conductor while in aqueous solution was the original definition of a "strong electrolyte."
Which electrolyte is the stronger, weaker?An electrolytes that dissolves almost entirely in water is said to be a strong electrolyte. Hydrogen chloride is a good illustration of the a strong electrolyte (HCl). An electrolyte that just doesn't entirely dissolve in water is referred to as a weak electrolyte.
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select all that apply select all the options that correctly describe the bond angles associated with each electron-domain geometry.
Bond angles also have an effect on the structure of molecules. Bond angles are the angles that connect adjacent lines to form bonds. The bond angle can be used to differentiate between linear, trigonal planar, tetraheral, trigonal-bipyramidal, and octahedral structures.
What is the tetrahedral geometry's electron domain angle?Thus, the molecular structure is bent at an angle just shy of 109.5° and the electron-pair geometry is tetrahedral.
Which five domains are there?The first four domains—Nutrition, Environment, Health, and Behavior—all contribute to our understanding of the animal's diverse experiences, which comprise the fifth domain, the Mental Domain.
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question:-
Select all that apply select all the options that correctly describe the bond angles associated with each electron-domain geometry?
a: The trigonal bipyramidal system has two different bond angles.
b: A species with 3 electron domains will exhibit an ideal bond angle of 120o.
c: A bond angle of 180o is observed for a linear system.
the area where it's most likely that electrons will be detected (bonding and nonbonding). One portion of an electrons domain is represented by a lone pair, singles, doubles, and triple bond.
How many domains of electrons are there?Two categories of electron domains exist: 1) A bound atom, and 2) an electron pair that is not ponding. All bonded atoms count as one electrons domain on the center atom, regardless of whether they are connected by a single, double, or triple bond. There are five fundamental geometries for electron domains.
What is the shape of an electron domain?Geometries of the electron domain. The five shapes that molecules can have in their electron domain geometries are linear, tetrahedral, triangular planar, triangular bipyramidal, and octahedral. Both the geometries and the forms of molecules exhibit many exceptions. They could be twisted, T-shaped, square planar, etc.
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Determine the work done in l ⋅ atm when a sample of gas expands from 1. 00 l to 2. 50 l against an external pressure of 0. 750 atm.
The work done by the gas to expand is 1.125 Joules.
The work done by the gas in expanding is given by,
W = P(V₂-V₁)
Where,
W is the work done,
P is the pressure,
V₁ is the initial volume,
V₂ is the final volume.
The final volume of the gas is 2.50L and the initial volume is 1 L, while the external pressure is 0.750 atm.
Putting values,
W = 0.750(2.50-1)
W = 1.125 Joules.
The work done by the gas is 1.125 Joules.
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A tree collects energy from the sun, carbon dioxide from the air, and nutrients and water from the soil. The tree also outputs oxygen and water. What type of system is this?.
Trees and plants use the energy from the sun and the carbon dioxide in the air to create the food they need to survive and develop through a process called photosynthesis.
How does photosynthesis work?In addition to plants that have chlorophyll, photosynthesis is a mechanism that uses sunlight to help plants produce food.
What happens during the photosynthesis process?A process known as photosynthesis occurs when the chlorophyll on a plant's leaves absorbs sunlight and uses it to change carbon dioxide and water into oxygen, hydrogen (water), and glucose. This glucose can then be used by the plant again or stored in the fruit.
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if he(g) has an average kinetic energy of 4570 j/mol4570 j/mol under certain conditions, what is the root mean square speed of cl2(g) molecules under the same conditions?
The root mean square speed of Cl₂ molecule is 11.34 cm/sec.
Solution
We need to calculate the root mean square speed of Cl₂ molecule.
Average kinetic energy = RT
where,
R = Molar gas constant
T = absolute temperature in Kelvin.
Given,
Average kinetic energy = 4570 J/mol
R= 8.314 J/mol/K
So, T = (4570 × 2)/(3 × 8.314)
⇒ T = 366.45 K
Root mean square velocity = √(3RT/M)
For, Cl₂ molecule,
M = 71 g/mol
T = 366.45 K (as condition is same as previous)
Therefore, Root mean square velocity = 11.34 cm/sec
Hence, Root mean square velocity = 11.34 cm/sec.
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how many grams of alcl3 are produced when 355 ml of 1.65 m hcl solution are reacted with excess al according to the reaction?
According to the reaction, when 355 ml of 1.65 m Hydrochloric acid solution are combined with too much aluminum, 26.03 g of aluminum chloride is created.
An inorganic substance with the formula AlCl3 is aluminum chloride, also referred to as aluminum trichloride. It takes the form of [Al(H2O)6] hexahydrate. Aluminum chloride is ALCl3, which is composed of six water molecules. Aqueous hydrochloric acid, also referred to as muriatic acid, is a type of hydrochloric acid. It is a colourless solution with an overpowering odor. Strong acid is how it is categorized.
2 Al(s) + 6 HCl is the given reaction. ———-> 2 AlCl3 + 3H2
Using the provided data
The amount of HCl in moles is n= Volume * Concentration = 0.58575 mol (1.65 M * 355 ml)/1000 ml
based on the response,
It takes 6 mols of HCl. To neutralize 2 moles of aluminum, 0.58575 mol of hydrochloric acid must be used.
using the cross-multiplication method, 0.19525 moles are obtained by multiplying 0.58575% by 2/ 6.
Weight of the AlCl3 = 0.1952 moles * 133.340538 g/mol = 26.03 g
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Which set of items listed can be arranged to transform chemical energy into mechanical energy?.
The set of items listed which can transform the chemical energy into the mechanical energy is the battery, wire, fan blades turning.
The chemical energy of the item is transformed into the mechanical energy by the arrangement of batteries, wire, and fan blades turning. In the wire, the movement of ion is observed, which causes the movement of fan blades. And this turning of fan blades convert chemical energy to mechanical energy.
In the engine combustion, chemical energy is first converted to heat energy, which causes the expansion of a fluid into a motion. In the contrast, motor proteins convert chemical energy in the molecule to the useful mechanical work.
Therefore, the set of items listed which can transform the chemical energy into the mechanical energy is the battery, wire, fan blades turning. Hence, option c is correct.
Your question is incomplete. The complete question is
Which set of items listed can be arranged to transform chemical energy into mechanical energy?
A. motor, fan blades turning, wire
B. magnet, wire, fan blades turning
C. battery, wire, fan blades turning
D. battery, magnet, heat
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A white salt containing an unknown metal has the formula mcl and gives a lilac flame during a flame test. The salt could be.
The salt could be potassium (K) and the salt will be KCl.
What is a flame test?A flame test is a qualitative test used in chemistry to determine the identity or putative identity of metal or metalloid ions in ionic compounds. When a compound is placed in the flame of a gas burner, it can emit a characteristic color visible to the bare eyes. The combustion test is used to identify the presence of relatively few metal ions in a compound. Not all metal ions give flame color. For Group 1 compounds, a flammability test is usually the easiest way to identify the metal you are using. For other metals, there are other simpler methods that are usually more reliable, but the combustion test can provide useful clues as to where to look. The color will change to yellow.
Potassium burns with a purple or light purple color, also known as lilac flame.
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Compare the structures of the nitrate ion and carbonate ion, paying close attention to the total number of valence electrons and atoms in each. Using this information, would you expect the structure of aluminium chloride (AlCl3) to be more like that of the carbonate ion or the chlorate ion? Explain.
The bonding in the aluminum chloride is closer to that of the chlorate ion in structure.
What are the structures of the nitrate and the carbonate ions?We know that sometimes, we can not be able to describe the properties of a compound or an ion or indeed any kind of chemical specie by just a single chemical structure. In that case, we would have to have recourse to a mix of structures that are able to show how the specie can be able to participate in a chemical reaction.
A close look at the carbonate ion and the nitrate ion would show us that the charge that is carried by the specie is delocalized over a number of atoms and such we can not be able to use only a single structure to explain the bonding that occurs in the ions.
On the other hand, the aluminium chloride is a compound that is ionic in nature. The bonding in the compound would look more like that of the chlorate ion which does not have the same molecular complexity as does the carbonate ion.
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ru3 express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals. for example, [he]2s22p2 should be entered as [he]2s^22p^2.
Electronic configuration for Ruthenium is:
[tex]Ru: [Kr]4d^{7}5s^{1}[/tex]
Electronic configuration: A neutral element's total number of electrons is represented by its electronic configuration. To get the total number of electrons in an atom, we sum all the superscripts.
As a result of the electrons being filled in accordance with Afbau's rule in sequence of increasing energies, the electronic configuration in terms of the configuration of noble gases is as follows:
[tex]Ru : [Kr]4d^{7} 5s^{1}[/tex]
Ruthenium is transition element with atomic number 44 and thus the nearest noble gas present is Krypton with 36 electrons.
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which of the elements listed below has the highest first ionization energy? question 9 options: he ne ar kr xe
The largest initial ionization energy belongs to Helium. It is the first member of the noble gas group in the periodic table and is a colorless, odorless, tasteless, inert, monatomic gas.
Where can one find helium?Helium is used as a coolant in nuclear reactors, in compressed air tanks, and in lasers. Of all the elements, Helium has the lowest melting and boiling points.
What purpose serves helium?A typical carrier gas for gas chromatography is Helium. It can be used to determine the age of rocks and minerals that contain uranium and thorium.
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Calculate the number of moles in 12.50 g of benzene C2H5OH.
The number of moles of Benzyl alcohol is 0.115 moles.
Number of moles can be also told in terms of Avogadro's number with is 6.023 × [tex]10^{23}[/tex]. It can be calculated for atoms, molecules, ions or others as well. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance. The concept of the mole helps to put quantitative information about what happens in a chemical equation on a macroscopic level. So it is used widely.
Molecular mass is nothing but the sum of atomic mass of all the element present in the molecule. In the above given question we have to calculate the number of moles of the molecule by using the given weight. To do so we use the below formula;
Number of moles = given weight
Molecular mass
⇒ 12.50 = 0.115 moles
108.14
Therefore the number of moles in 12.50 g of benzene C2H5OH is 0.115 moles
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Determine the number of atoms of Nitrogen for each chemical formula
help!
Answer: C0- 1 copper atom, 2 nitrogen, 6 oxygen atoms.
(NH4)3PO4- 12 atoms of hydrogen, three atoms of nitrogen, one atom of phosphorus, and four atoms of oxygen
NH42Cr- 1 molecule of ammonium dichromate,
AlNO3- a-1 n-3 o-9
NH4NO3- n- 2 h-4 o-3
Explanation:
What is the weighted average of a nail in the sample data given?
The weighted average of the nail in accordance with the given data is 11.176g.
How to calculate weighted average?Weighted average is an arithmetic mean of values biased according to agreed weightings.
The weighted average of the nail in the image above can be calculated by multiplying the decimal abundance with the mass of the nail, then summed up as follows;
Weighted average = (decimal abundance × mass 1) + (decimal abundance × mass 2)
Weighted average = (0.12 × 3.3) + (0.88 × 12.25)
Weighted average = 0.396 + 10.78
Weighted average = 11.176g
Therefore, 11.176g is the weighted average of the nail
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which one of the following is not true concerning diels-alder reactions? multiple choice the reaction is stereospecific. the reaction mechanism has only one step. the reaction mechanism involves a resonance stabilized carbocation. the diene must be a conjugated diene.
The Diels-Alder reaction mechanism involves a resonance stabilized carbocation is not true.
What id Diels-Alder reaction?
A Diels-alder reaction is made up of two components i.e
i - Diene which is made up of two adjacent pi bonds.
ii - dienophile which has atleast one pi bond.
In this Diels-Alder reaction, two sigma bonds and one pi bond are created while three pi bonds are broken every single time.
In Diels-Alder reaction, diene are always conjugated.
The Diels-Alder reaction is always stereospecific which means that both the diene and the dienophile's attached substituents maintain their stereochemistry throughout the reaction.
The Diels-Alder reaction is a concerted reaction which means that it always takes place in one step.
Hence, as all the other options are true we can say that the mechanism involves a resonance stabilized carbocation is not true.
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It is untrue that a resonance stabilised carbocation is involved in the Diels-Alder reaction mechanism.
What id Diels-Alder reaction?
Diels-Alder reactions consist of two parts, namely
two adjacent pi bonds make up the compound I - diene.
Dienophile with at least one pi bond is ii.
Three pi bonds are always broken in this Diels-Alder reaction, but two sigma bonds and one pi bond are always formed.
The dienes used in the Diels-Alder reaction are always conjugated.
The attached substituents to both the diene and the dienophile maintain their stereochemistry throughout the Diels-Alder reaction because it is always stereospecific.
The Diels-Alder reaction always proceeds in a single step because it is a concerted reaction.
We can therefore conclude that the mechanism involving a resonance stabilised carbocation is untrue because all of the other options are true.
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what quantities can be calculated from the bohr equation for the energy levels of the hydrogen atom? select all that apply.
The Bohr equation for energy levels of the hydrogen atom can be used to calculate the wavelength of a spectral line, to ionize hydrogen atom and to find the energy exchange of the electrons revolving between two levels.
What is Bohr's atomic theory?
In 1913, Neil Bohr presented his atomic theory called 'Bohr's atomic theory'. It was the first model that described the atomic hydrogen spectrum accurately along with wavelength.
Moreover, the theory indicates that the electron move in fixed circular orbits around the nucleus in an atom and there are no chances of electron finding in between the shells. The formula for Bohr's atomic model is l = nh/2π
To put it simply, in an atom, each orbit has its own specific energy and are commonly called energy levels or energy shells.
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4. Which of the following are examples of precipitation reactions? Select all that apply.
O 2 H₂(g) + O2(g) → 2 H₂O(1)
O KCl(aq) + AgNO3(ag) → KNO3(aq) + AgCl(s)
O Mg(s) + O2(g) → MgO2(s)
O HCl(aq) + NaOH(ag) → H₂O(1) + NaCl(aq)
Option - b is answer.
KCl(aq) + AgNO₃(ag) → KNO₃(aq) + AgCl(s) is example for precipitation reactions.
What kind of precipitation reaction is this, specifically?The chemical reaction between potassium chloride and silver nitrate, which results in the precipitation of solid silver chloride, is one of the best illustrations of precipitation reactions. The precipitation reaction resulted in the formation of this insoluble salt.
In a precipitation reaction, dissolved substances combine to create one or more solid products. This type of reaction occurs frequently and is also known as double displacement, double replacement, or metathesis reactions because it frequently involves the exchange of ions between ionic compounds in aqueous solutions.
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a 1 liter solution contains 0.335 m hydrocyanic acid and 0.446 m sodium cyanide. addition of 0.368 moles of potassium hydroxide will:
addition of potassium hydroxide slightly increases the pH .
What is buffer solution ?
A buffer is a solution that can withstand changes in pH due to the addition of acidic or basic components. It can neutralize small amounts of added acids or bases and keep the pH of the solution relatively stable. This is important for processes and reactions that require a specific and stable pH range. Buffers have a working pH range and capacity that determines how much acid/base they can neutralize before their pH changes, and how much they change. Both of the two components (conjugate acid and conjugate base) are present in significant amounts and can neutralize small amounts of other acids and bases (in the form of H3O+ and OH-), thus withstanding pH changes. increase. Added to the solution. To illustrate this effect, we can consider a simple example of a buffer made from hydrofluoric acid (HF) and sodium fluoride (NaF). Hydrofluoric acid is a weak acid due to the strong attraction between the relatively small F ions and solvated protons (H3O+), which prevents complete dissociation in water.
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How do you make chocolate not melt on your hands?.
The steps to make chocolate so that it does not melt on my hands are: heat the chocolate up to 120 degree fahrenheit and then after removing the bowl cool down it below 80 degree fahrenheit.
The main reasons to temper chocolate are:
1. Tempered chocolate is firm and solid in nature at room temperature. This is critical when making the chocolate confections or decorations. Chocolate which is out of temper requires refrigeration to maintain its shape.
2. The appearance of tempered chocolate is much better than that of its un-tempered counterpart. Tempered chocolate is smooth in nature , shiny and evenly colored.
3. Chocolate that is not been tempered has a distinctly dull appearance and may develop fat bloom -- grayish-white spots on the surface of the chocolate where unstable beta crystals have gathered.
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how many different alkenes will be produced when the following substrate is treated with a strong base?
The substrate is a cyclohexane ring. There will be six different alkenes produced when the cyclohexane ring is treated with a strong base.
What is alkenes?
Alkenes are a common family of hydrocarbons discovered in crude oil. There is at least one carbon-carbon double bond in this family. This double bond significantly alters the chemistry of the family's compounds.
Alkenes, and ethene in particular, play a crucial role in the chemical industry. They are created through the cracking of the alkanes but are not present in significant amounts in crude oil. Like all hydrocarbons, alkenes burn in the presence of air to produce carbon dioxide and water. Ethene reacts violently in oxygen, making it ineffective as a fuel. Additionally, the alkenes are too useful for the production of plastics and numerous other chemicals that are used as fuels in the chemical industry.
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