Answer:Because to make up an atom you need different isotopes
Explanation: Because if you didnt you would have the same amount.
a 0.7209-g solid mixture containing mgcl2 is dissolved in water and treated with an excess of agno3, resulting in the precipitation of 1.032 g of agcl. what is the percent of mass of mgcl2 in the mixture? a) 47.54% b) 23.77% c) 69.85% d) 95.08%
The percent mass of MgCl₂ in the mixture is 47.54%; option A.
What are the moles of chloride ions present in the original sample?The moles of chloride ion present in the original solid sample containing MgCl₂ is determined as follows:
Mass of AgCl precipitate = 1.032 g
Moles of AgCl = mass / molar mass
The molar mass of AgCl = 143.5 g/mol
Moles of AgCl = 1.032 / 143.5
Moles of AgCl = 0.00719 moles
Moles of Cl⁻ ions = 0.00719 moles
Moles of Cl⁻ ions in 1 mole MgCl₂ = 2 moles
Hence moles of MgCl in the solid sample = 0.00719 / 2 = 0.003595 moles
Mass of MgCl₂ in the sample = moles * molar mass
Molar mass of MgCl₂ = 95 g/mol
Mass of MgCl₂ = 0.003595 * 95
Mass of MgCl₂ = 0.3415 g
Percent mass of MgCl₂ in the sample = (0.3415 / 0.7209) * 100 %
Percent mass of MgCl₂ in the sample = 47.4%
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A sample of neon gas has a pressure of 0.75atm at a temperature of 100K. The sample is heated to 400K. What is the pressure of the gas after it is heated?
The pressure of the gas after it is heated is 3 atm.
Strain is the pressure applied perpendicular to the floor of an object in step with the unit area over which that force is sent. Gauge pressure is the stress relative to ambient stress. various gadgets are used for specific stress.
Stress is described as the pressure of all of the gasoline particle/wall collisions divided by using the vicinity of the wall: All gases exert stress; it is one of the fundamental measurable quantities of this segment of relying on.
Stress is the bodily quantity of pressure that unfolds over a certain region. In different words, strain is a force in line with unit location. in case you take the amount of pressure being carried out on a frame, and divide it by the region of contact, you'll arrive at the pressure being carried out on the frame.
PV = nRT
P₁ = 0.75atm
T₁ = 100K
T₂ = 400K
V,n, and R is constant
P₁/T₁ = P₂/T₂
P₂ = P₁/T₁ × T₂
= 0.75atm / 100K × 400K
Pressure = 3 atm.
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Compare the samples you graphed. Describe the relationship between heat increase and temperature for the samples shown in the table. Would you be able to predict the heat increase needed to get to 60ºC for all of the samples, some of them, or none of them?
The entire energy of all internal molecular motion makes up an object's heat.The thermal energy or average heat of the molecules in a substance is measured by temperature.It is a measurement of the quantity of atoms times the energy that each atom possesses.
How do heat and temperature relate to one another?
Let's now think about the connection between heat and temperature.The temperature rises as materials are heated.In other words, when a substance receives energy, the molecules that make up that substance move more quickly. The energy that is transferred from a hot object to a cold object is called heat.A measurement of an object's hotness or coolness is its temperature.Both the specific heat equation (Q=mcT Q = m c T) and the latent heat equation (Q=ml Q = m l) relate these two numbers. Meaning that it will require more heat to raise a temperature by one degree the more mass you govern.In contrast, the specific heat capacity would remain constant regardless of the mass used to raise the temperature by one degree Celsius.Heat capacity=mass*specific heat capacity is the relationship between the two. Temperature fluctuations are typically a good indicator of changes in heat.A group of atoms often move more quickly and become hotter when you add energy to them.Similar to this, when energy is removed from a group of atoms, they typically move less and become cooler. Heat is a measure of change, never a quality that an item or system possesses.It is categorized as a process variable as a result.Temperature can be expressed in Celsius (°C), Kelvin (K), Fahrenheit (°F), or Rankine units and describes the average kinetic energy of molecules inside a substance or system (R). The quantity of energy produced as a substance's temperature rises is referred to as heat.The right response is therefore option d, which states that heat is the energy transfer caused by a temperature differential. Heat is exchanged between two objects when their temperatures differ.When the two items reach the same temperature, the cooler object becomes warmer.Always, heat energy moves from a hot object to a cooler object. The average measurement of a substance's heat energy is its temperature.A body's temperature determines how hot or cold it is.The material becomes heated when a body's temperature rises.To learn more about heat and temperature refer
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Which law does the equation below represent?
Mass reactants = Mass Products
1. Law of inertia
2. Law of definite proportions
3. Law of gravitation
4. Second law of motion
5. Law of conservation of mass
An element has two stable isotopes. One has a mass of 13.00 amu and is 1.07% abundant. The second has a mass of 12.00 amu and is 98.93% abundant. What is the average atomic mass of the element?
The the average atomic mass of the elements is 12.01, one has a mass of 13.00 amu and is 1.07% abundant. The second has a mass of 12.00 amu and is 98.93% abundant.
What is abundant?The distribution of the chemical elements in relation to all other elements in a given environment is gauged by their abundance. Amount can be determined in one of three ways: by mass-fraction (the same as weight-fraction), by mole-fraction (fraction of atoms by numerical count, or occasionally fraction of molecules in gases), or by volume-fraction.
For gas mixtures at relatively low densities and pressures, such as those found in planetary atmospheres, volume-fraction is a common abundance measure. It has a similar significance to molecular mole-fraction for ideal gas mixtures. The majority of abundant values are presented in this article as mass-fractions.
To calculate the average atomic weight, each isotopic atomic weight is multiplied by its percent abundance, and then added to find the average atomic mass that is
Amu[tex]_{avr}[/tex] = (13.00)(1.07%) + (12.00)(98.93%)
= (13.00)(0.0107) + (12.00)(0.9893)
= 12.0107 amu
= 12.01 amu
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Why can no substance reach the temperature of absolute zero?
Because we do not yet have the technology to make something that cold
Because matter heats up too fast for it to get to absolute zero
Because something at absolute zero would have no kinetic energy, and atoms can never stop vibrating
Answer:
Because something at absolute zero would have no kinetic energy, and atoms can never stop vibrating.
Explanation:
If something were to reach absolute zero, that means that the particles would reach a position were we are able to detect precisely their velocity and position in the atom.
This cannot be possible because it would violate Heisenberg's Uncertainty Principle, which in brief states that we can measure the velocity of electron but we would be uncertain about the position and vice versa. We cannot predict both velocity and position accurately.
When someone jumps down on a trampoline, that person is propelled upwards. Choose the best statement describing how this
demonstrates Newton's third law. (1 point)
The style of the jumper's footwear affects the first action of compressing the jumping surface.
The trampoline pushes back with equal force but in the opposite direction.
The direction of the motion is changed by the surface area of the jumper that comes in contact with the trampoline.
The color of the trampoline's jumping surface can affect the reaction force.
Answer:
(b) The trampoline pushes back with equal force but in the opposite direction
Explanation:
Newton's third law states that when an object applies a force upon another object, the second object applies a force of equal magnitude but opposite direction upon the first object.
Answer:
(Question) When someone jumps down on a trampoline, that person is propelled upwards. Choose the best statement describing how this demonstrates Newton’s third law.
(Answer) The trampoline pushes back with equal force but in the opposite direction.
(Question) When inflating a balloon, which of the following represents an equal but opposite force acting on the balloon?
(Answer) the expansion of the balloon
(Question) A force of 30 N to the right is applied to an object. An opposite force of 20 N to the left is applied to the same object. What is the net force applied to the object?
(Answer) 10N to the right
(Question) Two objects with the same mass have the same force applied to them. What can be said of their acceleration?
(Answer) Their acceleration will be the same.
(Question) What do force diagrams show?
(Answer) the magnitude and direction of forces acting on an object
Explanation:
just did the quick check, enjoy UwU
Sean is moving heavy furniture by sliding it
across the floor. He puts a blanket
underneath the furniture. Why did this help
him?
Answer:
the blanket let's him slide it across the floor because the has less friction with the floor than the furniture.
Answer:
Blanket underneath the furniture may reduce the kinetic friction
Explanation:
When sliding an object across a surface, the force of kinetic friction will oppose the movement of the object.
By placing a blanket between the object and the surface, the kinetic friction coefficient may be reduced.
Therefore, putting a blanket underneath the furniture may reduce the kinetic friction coefficient, then making it easier to slide the forniture.
(Hi fyi this answer took a lot of time & effort to make sure it was accurate, precise and to the point to be produced, so if you could opt this answer as the brainliest it would mean the world to me,)
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Cheers !
Transition metals can be found in Families 3 through 12 on the periodic table. What property do transition metals share?
Answer:
most of them form coloured compound
When 0.424g of iron powder is burned in an oxygen atmosphere, 0.606g of a reddish brown oxide is obtained. Determine the empirical formula of the oxide.
Fe2O3 is the empirical formula of the oxide when 0.424 g of iron powder is burned in an oxygen atmosphere, 0.606 g of a reddish brown oxide is obtained.
What is empirical formula and how it is calculated out to be so ?Empirical formula is widely used and heard word in the world of chemistry which represents the simplest whole number ratio of atoms present in compound.To solve the questions of empirical formula one must first calculate the mass percent of the element.The moles of iron would be 0.424/ 55 = 0.00759 , mass of oxygen = 0.606 - 0.424 =0.182 g.The moles of O = 0.182/16 = 0.0114, the ratio between O and iron is 0.0114/0.00759 = 1.5 .To get the whole number , multiply by 2 and here is the formula Fe2O3.To know more about empirical formula visit:
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Look at the image its supposed to be freshmen stuff I got 20 points for a good answer
Answer:
i waht
Explanation:
How does the length of the carbon chain change the importance of London Dispersion Forces versus Hydrogen bonding in the boiling point of an organic molecule?
The length of the carbon chain increases the importance of London Dispersion Forces compared to Hydrogen bonding the boiling point of an organic molecule.
What are intermolecular forces?Intermolecular forces are forces that exist between the molecules of a compound or element.
Intermolecular forces account for the physical state in which a compound or an element exists.
The intermolecular forces that exist between molecules of compounds or elements include:
London dispersion forcesDipole-dipole forces, and Hydrogen bondingLondon dispersion forces are intermolecular forces that exist as a result of temporary dipoles that exists due to the distribution of electrons between atoms in a compound in a compound or element.
London dispersion forces are the weakest intermolecular forces but become stronger with an increase in the number of electrons in the compound.
In organic compounds, an increase in the lentgth of the carbon chain means that more electrons are present for sharing, hence London dispersion forces become stronger with an increase in carbon length in organic compounds.
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what is the purpose of calibrating the calorimeter? group of answer choices account for any light energy added to the calorimeter caused by the overhead lights account for any heat loss caused by using an imperfect calorimeter to check that the thermometer is working properly to make sure the cup doesn't have any water leaks
The calorimeter is calibrated to check that the thermometer is working properly. Therefore, option (C) is correct.
How to calibrate a calorimeter?A calorimeter can be described as a device that can measure the heat released or absorbed in a chemical reaction. In a calorimeter, a thermometer is placed through the small opening to measure the temperature. Calibrating a calorimeter is a relatively simple process.
The technique used to measure the amount of heat involved in a process is called calorimetry. The heat is exchanged with a calibrated object and the change in temperature of the calorimeter is converted into the amount of heat.
The measurement of heat transfer using this approach requires the definition of a system and its surroundings. Bomb calorimeters need calibration to find the heat capacity of the calorimeter and ensure accurate results. The calibration is performed each time before the calorimeter is used.
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How long does it take a radio signal from the voyager spacecraft to reach earth if the distance between voyager and earth is 2.72 x 109 km
The time taken for the radio signal from the voyager spacecraft to reach earth is 9066.67 s
How to determine the timeWe'll begin by obtaining an equation to determine the time. This is illustrated below
We know that speed is defined
Speed = distance / time
Cross multiply
Speed × time = distance
Divide both side speed
Time = distance / speed
With the above formula, we can obtain the time. Details below.
The following data were obtained from the question give above:
Distance = 2.72×10⁹ KmSpeed of radio signal = 3×10⁸ m/s = 3×10⁸ / 1000 = 300000 Km/sTime =?Time = distance / speedTime = distance / speed
Time = 2.72×10⁹ / 300000
Time = 9066.67 s
Thus, we can conclude that the time required is 9066.67 s
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What reaction would the chemical equation 2H₂O → 2H₂ + O₂ represent?
O combustion of water
O formation of water
O decomposition of water
O replacement of water
Answer:
decomposition of water
Explanation:
A combustion reaction involves carbon dioxide so it can't be that The water is not being formed The water is not replaced by the other molecules
So it is decomposition, not just from process of elimination, but also because decomposing water means heating it.
A 25.00 ml sample of hydrochloric acid is titrated with 15.09 ml of 1.2 m naoh using phenolphthalein as an indicator. what is the concentration of the hydrochloric acid solution?
Answer:
NaOH + HCl ---> NaCl + H₂O
Explanation:
When chemical reactions occur, why are atoms ionized? Please answer in a basic chemistry terms.
Answer: Ionization is a chemical reaction itself. In chemistry and physics, ionization is a process where electrically neutral atoms become charged atoms by gaining or losing an electron. If an atom (or molecule) loses an electron, it becomes positively charged (aka a cation). Conversely, if an atom gains an electron, it becomes negatively charged (aka an anion). In either case, the electrical balance changes within an atom.
Explanation: A classic example of this would be sodium and chlorine combining to create salt. In this reaction, the sodium atom gives up one electron (making it positively charged) and the chlorine atom receives the electron (making it negatively charged).
which compound would be expected to show intense ir absorption at 2250 cm-1
(CH3)2CHCN compound would be expected to show intense IR absorption at 2250 cm⁻¹.
The intensity of IR vibration will be directly proportional to the magnitude of change in dipole moment during the molecular vibration.
Here, it is given that IR absorption is at 2250 cm⁻¹. This is typical vibration for C-N stretch, hence the compound will have -C-N group. Hence, the correct answer will be (CH3)2CHCN.
➤ In general, the interaction between the IR electric field vector and the molecular dipole transition moments associated with the molecular vibrations is what causes IR absorption. When the electric field vector and the dipole transition moment are parallel to one another, absorption is at its highest level.
By analyzing characteristic absorbances and comparing them to spectral libraries, one can use the IR spectrum of an organic compound to determine unknowns. Due to its sensitivity and selectivity, IR spectroscopy is also utilized in quantitative techniques.
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3. Is the bright line spectra a physical or chemical property? Explain.
The bright line spectra is a physical property of an element because it occurs in the physical appearance of an element.
What is the bright line spectrum in physics?A bright line spectrum is formed when a light beam passes through an analyte sample where some wavelengths of the light are absorbed by the atoms present in the sample which leads to attaining the excited state of the electrons in those atoms. As the excited electron returns to the ground state, the energy that was absorbed is released in the form of discrete lines of light. Spectral lines are formed by the transitions of electrons within atoms. As the electrons move closer to the nucleus or farther from the nucleus of an atom, energy in the form of light is emitted or absorbed. A continuous spectrum comprises lights of all wavelengths within a certain range whereas a line spectrum only consists of a few wavelengths.
So we can conclude that due to the occurrence in the physical appearance of an element, the bright line spectra are considered as a physical property of an element.
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A ________ is used to show the number and types of atoms present in a molecule
include this sentence starter: “as energy flows through this system of interacting parts..” explain how the energy is flowing through this system, how energy enters the system, how energy charges form while in the system, how energy leaves the system . PLEASE ANSWER THIS I WILL MARK YOU BRAINLIEST
energy flows through this system of interacting parts
Wind → Turbine → Generator → electricity
What is kinetic energy ?Kinetic energy is the energy an object has because of its motion. force must be applied to it. To apply a force, we must exert effort. Energy is transmitted to the object after work is accomplished, which causes it to move at a new, constant pace
BreifingEnergy flows to the system - by moving a shaft which is connected to a generator, and thereby producing electrical energy through electromagnetism.
Energy enters system - The blades are connected to a drive shaft that turns an electric generator, which produces (generates) electricity.
Energy Charges - produced (generated) electricity runs through sytem
and stored in battery.
Energy leaves system - energy leaves the system, its sign is negative.
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2 dyes have the same rf values. explain whether this is the same dye or no
i know why there the same values but I don't know how to phrase it to get the full 3 marks.
The 2 dyes only interact to the same extent with the solvent, they may not be the same dye.
Are they the same compound?We know that chromatography is the process by which we are able to separate two or more substances. In the process of thin layer chromatography, the stationary phase which is always an adsorbent coated surface is spotted with the mixture that is to be separated and added to a solvent. The extent to which the mixture dies interact with the solvent is what determines the Rf of the system.
The Rf is the degree to which each of the components of the solute are moved with respect to the pure solvent front. When two compounds have the same Rf, it means that the two components are able to interact with the solvent to the same extent.
Note that the fact that the components of the mixture interact with the solvent to the same extent does not necessarily means that they are the same compound.
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19. What particle is needed to balance the following
nuclear equation?
20.50 Fe -
26
23Al + He →>>
134
For each nuclear equation in Questions 20-22, name
the particle that is being emitted.
Co + e
¹r + He
1181 +
53
21.¹95 Au →
79
22.118Xe
54
+30p
15
+1
Conservation laws apply to nuclear reactions as well, and they are balanced in two ways: The mass numbers of the reactants added together are equal to the mass numbers of the products added together.
Nuclear reactions can involve a wide variety of entities. The most prevalent particles are protons, neutrons, alpha and beta particles, positrons, and gamma rays.
The components of atomic nuclei are protons (also known as [tex]p_1^1[/tex] and [tex]H_1^1[/tex]) and neutrons (also known as [tex]_1n^0[/tex]), and they have already been discussed. High-energy helium nuclei are known as alpha particles ([tex]4 _He^2[/tex], usually written as [tex]_4\alpha^2[/tex] ).
Gamma rays are photons of extremely high-energy electromagnetic radiation, while beta particles (also known as 0e1 particles) are high-energy electrons. Positrons, commonly known as "anti-electrons," are positively charged electrons (sometimes denoted by the sign 0[tex]\alpha[/tex]+ 1 ). The balancing of nuclear equations requires the use of subscripts and superscripts.
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(a) which kind of mechanism can better account for the product mixture obtained from the dehydration of cis- and trans-4-methylcyclohexanol: e1, e2, or a combination of the two? (keep in mind that the actual mech-anism may be none of these.) (b) based on your answer, write detailed mechanisms explaining the formation of all of the observed products
E1 mechanism can better account for the product mixture obtained from the dehydration of cis- and trans-4-methylcyclohexanol.
The reaction for the dehydration of cis-4-methylcyclohexanol is depicted as follows: (image 1)
In the above reaction, cis-4-methylcyclohexanol reacts with sulfuric acid and produces (S)-4-methylcyclohex-1-ene and (R)-4-methylcyclohex-1-ene.
Mechanism (image 2)
In the above reaction, the lone pair of the oxygen atom of cis-4-methylcyclohexanol accepts a proton from sulfuric acid. After that, carbocation is generated after the removal of water. Then, the hydrogen sulfate ion accepts the hydrogen and produces two alkene products. The products are (S)- 4-methylcyclohex-1-ene and (R)-4-methylcyclohex-1-ene. The above mechanism proceeds through the E1 mechanism.
Hence, the product mixture is obtained from cis-4-methylcyclohexanol through E1 mechanism.
b) The reaction for the dehydration of trans-4-methylcyclohexanol can be summarised as follows: (image 3) In such a reaction, trans-4-methylcyclohexanol reacts with sulfuric acid and produces (R)- 4-methylcyclohex-1-ene and (S)-4-methylcyclohex-1-ene.
The above mechanism shows that the lone pair of the oxygen atom of trans-4-methylcyclohexanol accepts a proton from sulfuric acid. Then, carbocation is generated after the removal of water. After that, hydrogen sulfate ion accepts the hydrogen and produces two alkene products. The products are (R)- 4-methylcyclohex-1-ene and (S)-4-methylcyclohex-1-ene. The mechanism proceeds through the E1 mechanism.
Hence, the product mixture is obtained from trans-4-methylcyclohexanol through E1 mechanism.
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2.026666666666667 in scientific notation
The scientific notation of 2.026666666666667 is:
2.026666666666667 x 10⁰E
What is scientific notation?Scientific notation is a method of expressing numbers that are either too large or too small to be written in decimal form. It is also known as scientific form or standard index form.The Scientific format represents a number in exponential notation by replacing a portion of it with E, where E (exponent) multiplies the preceding number by 10 to the nth power. A 2-decimal scientific format, for example, displays 12345678901 as 1.23E+10, which is 1.23 times 10 to the 10th power.
The following are the scientific notation rules:
The base should always be ten.The exponent must be a non-zero integer, which can be positive or negative.The coefficient's absolute value is greater than or equal to one, but less than ten.Coefficients can be positive or negative numbers, both whole and decimal.The remainder of the significant digits of are carried by the mantissa.Here given , 2.026666666666667
A scientific notation number always has the form
a x 10ᵇ
where |a| is greater than or equal to one but less than ten and b is an integer
Because 2.0266666666667 is already greater than or equal to 1 and less than 10, we can simply rewrite it as
2.026666666666667 x 1
According to one of the index laws, any non-zero number raised to the power of 0 equals 1.
We can specifically state that
1 = 10⁰
as well as rewriting 2.0266666666667 in scientific notation as
2.026666666666667 x 10⁰E
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Using your knowledge of the absorption and emission processes, why are only specific colors absorbed and emitted?.
Answer:
Because the atom can only absorb specific amounts of energy
Explanation:
hope this helps
Which step in an enzyme-catalyzed reaction was assumed to be negligible by michaelis and menten?.
Formation of ES from E+P is a step that was negligible by Michaelis and Menten in an enzyme-catalyzed reaction.
Enzyme-catalyzed reaction:
The enzyme-substrate complex formation is in equilibrium with the enzyme and substrate; the decomposition of the complex into the product is the rate-limiting step, so the rate is proportional to both substrate and enzyme as long as the equilibrium can be shifted by either species.
The step that was negligible by Michaelis and Menten is:
Formation of ES
E + S ---------> ES --------> E + P
E = enzyme concentration
S = substrate concentration
P = product concentration
Therefore the formation of ES from E + P is negligible by Michaelis and Menten.
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The product side of a chemical reaction is shown.
→ 7Ti2(SO4)3
Which number represents a coefficient?
The number that represents the coefficient on the product side of the chemical reaction, [tex]-- > 7Ti_2(SO_4)_3[/tex] is 7.
Coefficients of chemical equationsIn equations representing chemical reactions, the coefficient of each reactant or product of a reaction is the number that comes on the left-hand side just before the chemical formula.
The coefficient of each species in a chemical reaction is obtainable when the equation of the reaction is balanced.
For example, in the following equation: 2A + B = 3C + D
The coefficients of A, B, C, and D are 2, 1, 3, and 1 respectively.
Applying this to the product side of a chemical reaction; [tex]-- > 7Ti_2(SO_4)_3[/tex]
It means that the coefficient of the product is 7.
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How are a substance and a solution similar? How are they different?
A substance and a solution have both uniform composition throughout. A substance is a matter that is uniform in composition and can be an element or compound. A solution is another name for homogeneous which is a mixture.
The difference of substances and solution, a substance has a definite composition and a solution has a variable composition. It is also uniform in composition, but a solution is made by combining two or more substances.
What is Solution ?
In chemistry, a solution is a homogeneous mixture of two or more compounds in their relative proportions. The composition of the solution can be continually changed up to the solubility limit. Although solutions of gases and solids are possible, the term "solution" is most frequently used to refer to the liquid condition of matter. Brass is a solution made of copper and zinc, whereas air is primarily an oxygen and nitrogen mixture with minute amounts of other gases.
A substance and a solution have both uniform composition throughout. A substance is a matter that is uniform in composition and can be an element or compound. A solution is another name for homogeneous which is a mixture.
The difference of substances and solution, a substance has a definite composition and a solution has a variable composition. It is also uniform in composition, but a solution is made by combining two or more substances.
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The Lewis dot diagram for an unidentified element is shown below. Which element
could X represent?
Olithium
calcium
O argon
sulfur
*
X*
The lewis dot diagram for the given element *X* is of Calcium element where two unpaired electrons are present.
Since calcium has an atomic number of 20 and argon, a noble gas, has an atomic number of 18, calcium is included in the second column of the periodic table.
Since we are discussing the 2⁺ cation, it has already experienced two electron losses. We can tell because every electron has a charge of 1, therefore losing a charge of 1 is equivalent to acquiring a charge of 1.
Additionally, neutral Ca initially had two electrons because it is on the second column or group. Ca₂⁺ has no valence electrons since 2 -2=0.
Drawing the Lewis structure is therefore not too difficult; all you need to do is write Ca and note that it has a 2+ charge.
So, the given element is Calcium.
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