(a) At 600 °C, for an Ag-90 at% Sr alloy:
I Draw the phase diagram's constitution point.
(ii) Determine the compositions of the current phases in at%.
(iii) A gradual cooling to 500°C takes place. Will the compositions and ratios of the phases change?
(b) At 600 °C, for an Ag-30 at% Sr alloy:
I Draw the phase diagram's constitution point.
(ii) Recognize the phases and calculate the compositions of each in at%.
(iii) If the temperature is lowered to 500°C, will the proportions change? Why is that so?
(c) The atomic weights of Ag and Sr are 107.9 and 87.6, respectively. Determine the weight percentages of the four intermetallic compounds that make up the Age Sr system.
c) For an Al-4 w t% Copper alloy
I Compute
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how many grams of c6h12o6 would contain 15g of carbon
One mole or 180 g of glucose contains 72 g of carbon. Thus, 37.5 g of glucose contains 15 g of carbon.
What is glucose?Glucose is the basic monomer sugar unit which polymerises to form carbohydrates. The formula of glucose is C₆H₁₂O₆. Glucose is formed by the combination of water and carbon dioxide.
The atomic mass of carbon = 12 g/mol
molar mass of C₆H₁₂O₆ = 180 g/mol.
C₆H₁₂O₆ contains 6 carbon atoms.
Thus, mass of 6 carbons = 6 × 12 g = 72 g
Hence, 180 g of glucose contains 72 g of carbon.
Now the mass of glucose which contain 15 g of carbon is :
= (15g × 180 g) / 72 g
= 37.5 g.
Therefore, the mass of C₆H₁₂O₆ containing 15 g carbon is 37.5 g.
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suppose the temperature of a gas is 373.15 k when it is at the boiling point of water. what then is the limiting value of the ratio of the pressure of the gas at th
117 grams of liquid water are in a cylinder with a piston maintaining 1 atm (101325 Pa) of pressure. It is exactly at the boiling point of water, 373.15 K. We then add heat to boil the water, converting it all to vapor. The molecular weight of water is 18 g/mol and the latent heat of vaporization is 2260 J/g.
What is the parameters?Let's state the parameters given.
Given that:
mass (m) = 117 gram
specific latent heat of vaporization (L) = 2260 J/g
Pressure (P) = 1 atm or 101325 Pa
Temperature (T) = 373.15 K
molecular weight = 18 g/mol
i.e we are to find the heat energy which is denoted by Q = mL
Q = 117g × 2260 J/g
= 264420 J
= 264.42 KJ
and the water vapor takes up some final volume
If we assume that the vapor is an ideal gas.
We can represent the parameters using the equation of an ideal gas:
PV=nRT
where;
P = 1 atm or 101325 Pa
n = no of moles of the water
n = mass/molecular weight
= 117/18
= 6.5 mole
R = 8.314
T = 373.15
= 0.199 m³
At Constant Pressure, the work done by the vapour in pushing on the piston can be calculated as:
W =(ΔV)
= 101.325 × (0.199 - 0)
= 101.325 × 0.199
= 20.16KJ
Let ΔU = water internal energy change
Q = Heat Energy
W = work done by the vapour in pushing on the piston
Q = ΔU + W
ΔU = - Q + W (by multiplying the left hand side with minus (-))
ΔU = Q - W
ΔU = 264.42 - 20.16
ΔU = 244.26KJ
Therefore, The molecular weight of water is 18 g/mol and the latent heat of vaporization is 2260 J/g.
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the half life for the radioactive decay of rubidium- to strontium- is years. suppose nuclear chemical analysis shows that there is of strontium- for every of rubidium- in a certain sample of rock. calculate the age of the rock. round your answer to significant digits.
Rubidium-87 to strontium-87 radioactive decay has a half life of 4.88 1010 years. According to nuclear chemistry analysis, a particular rock sample has 0.423 mmol of strontium-87 for every 1.000 mmol of Rb-87.
Strontium-87 is produced when the naturally occurring isotope rubidium-87 decays by beta emission. The theory behind a technique for dating rocks is based on this deterioration. There are detectable levels of rubidium (Rb) and strontium (Sr) in the majority of igneous, metamorphic, and sedimentary rocks. However, because they are nearly never present in amounts greater than 1%, these elements are rarely found in normal chemical analyses. Strontium does create a carbonate (strontianite) and a sulfate (celestite), which are found in some hydrothermal deposits and certain sedimentary rocks, particularly carbonates, but neither rubidium nor strontium is a substantial component in the common rock-forming silicate minerals.
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How does the difference between the ranges of the strong nuclear force and the coulomb force affect the makeup of each atom’s nucleus?
The difference between the ranges of the strong nuclear force and the coulomb force that holds atomic nuclei together is the nuclear force, the tight force between nucleons.
At very short distances, nuclear forces repel, keeping protons and neutrons from getting too close to each other. The strong force holds together quarks, the elementary particles that make up the protons and neutrons of the atomic nucleus, and further holds the protons and neutrons together into the atomic nucleus.
As such, it is responsible for the underlying stability of matter. The nuclear force arises from the exchange of virtual optical mesons, such as virtual pions, and two types of virtual mesons with spin (vector mesons), rho mesons and omega mesons.
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What is the half-life of carbon 14?
5700 ± 30 years
Carbon 14 is an isotope of carbon, which has longest life amongst the three isotopes of carbon but very low abundance as compared to the other isotopes of carbon.
Carbon-14 nucleus has six protons and eight neutrons, for an atomic mass of 14.
It is a radioactive isotope of carbon.
Its half life is too high which makes it useful for dating in archaeology and to know age of fossils.
Carbon-14 decays slowly in a living organism. After the organism dies, it ceases to absorb carbon-14, such that the amount of the isotope in the tissues of decayed organisms decreases.
It has a half-life of 5,730 ± 30 years which means half of the amount of the isotope present at any instant will undergo disintegration during the next 5,730 years.
Carbon-14 decays at a constant rate, an estimate of the date at which an organism died can be made by measuring the amount of its leftover carbon-14.
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calculate the number of milliters of 0.540 m ba(oh)2 required to precipitate as ni(oh)2 all of the ni2 ions in 166 ml of 0.531 m nibr2 solution.
the number of milliters of 0.540 m ba(oh)2 required is 97.80 ml
The given equation of reaction is
NiBr2(aq) + Ba(OH)2(aq) --> Ni(OH)2(s)+BaBr2(aq)
molarity of NiBr2 is 0.531 M
volume = 166 ml
Molarity of Ba(OH)2 = 0.54 M
let volume is V liters
According to the equation ,
1mole of NiBr2 requires --> 1moles of Ba(OH)2
0.531 * 0.166 = V * .540
v =[tex]\frac{0.531*0.166}{0.54}[/tex]
V = 97.80 ml
Molarity (also called molarity, bulk concentration, or substance concentration) is a measure of the concentration of a chemical species.
To find the molarity of a solution, divide the number of moles of solute by the total volume of the solution in liters.
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which formula represents an asymmetrical molecule
Answer:
Explanation:
An asymmetrical molecule is a molecule that has non-superimposable mirror images. In other words, the molecule cannot be superimposed on its own mirror image.
One way to represent an asymmetrical molecule is with the formula R-L, where R and L represent different groups attached to a central carbon atom. This formula indicates that the molecule has a chiral carbon, which is a carbon atom that is bonded to four different groups. Because the groups attached to the carbon atom are different, the molecule is asymmetrical.
Another way to represent an asymmetrical molecule is with the formula (R,R)-(S,S), where R and S represent different groups attached to a central carbon atom. This formula indicates that the molecule has two chiral carbons, each of which is bonded to two R groups and two S groups. Because the groups attached to the carbons are different, the molecule is asymmetrical.
Overall, the exact formula for an asymmetrical molecule will depend on the specific groups attached to the central carbon atom(s) and the arrangement of those groups.
the absolute temperature of a sample of monatomic ideal gas is doubled at constant volume. what effect, if any, does this have on the pressure and density of the sample of gas?
The absolute temperature of a sample of monatomic ideal gas is doubled at constant volume. The effect, if any, does this have on the pressure and density of the sample of gas is doubled and remains the same.
The ideal gas equation is given that :
P V = n R T
where,
P = Pressure
V = volume
n = no. of moles
R = gas constant
T = temperature
it is clear from the above equation that if we doubled the temperature of the gas the pressure of the gas is also doubled because they are directly proportional to each other. the density is given as :
density = mass / volume
it is clear that density is only depends on the mass and the volume so, it will remains the same.
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PLEASE HELP ASAP:Two objects are placed a certain distance from each other. The amount of gravitational force between the two objects depends on their masses and the distance between them. As the masses of the objects decrease, the force of gravity between them _____________. As the distance between the objects decreases, the force of gravity between them ______________.
Potassium metal reacts hydrochloric acid to produce hydrogen gas and potassium chloride. If 3. 0 moles of potassium reacts to form 2. 0 moles of potassium chloride, how many moles of hydrogen gas are produced?.
The moles of hydrogen gas produced is 2.0 moles that can be determined using stoichiometry ratios.
The response among potassium and hydrochloric acid is over very quick. The potassium at once ignites on touch with the acid, generating a vivid lilac flame that quick grows till the potassium burns up.
The chemical reaction can be depicted as follows:
2K(s)+2HCl(aq)→KCl2(aq)+H2(g)
The moles of potassium are 3.0 moles.
The moles of potassium chloride are 2.0 moles.
According to the stoichiometry of the reaction, two moles of potassium react with two moles of hydrochloric acid to produce two moles of potassium chloride and one mole of hydrogen gas.
Thus, the moles of hydrogen gas produced is 2.0 moles.
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Which electron i, on average, farther from the nucleu: an electron in a 5d orbital or an electron in a 4d orbital?
According to Aufbau Principle electrons are to be filled in a pattern that is, starting from lower-energy atomic orbitals electrons will be filling into the higher-energy orbitals.
So, electrons will be filled in the 4d orbital before 5d orbital.
Also the electron in 4d orbital will lie closer to the nucleus as compared to the electron in the 5d orbital.
as the principle quantum number for the electron in 4d orbital is 4, which means the electron is present in shell 4, i.e. n=4.
Whereas, the principle quantum number for the electron in 5d orbital is 5, which means the electron is present in shell 5, i.e. n=5.
If we see Neil Bohr's atomic model,
Electrons in 4th shell will be closer to the atomic nucleus than that of electron in 5th shell.
For clarification, you can see the figure.
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when solid sodium hydroxide dissolves in water, the δh for the solution process is −44.4 kj/mol. if a 13.9 g sample of naoh dissolves in 250.0 g of water in a coffee-cup calorimeter initially at 23.0 °c. what is the final temperature of the solution? assume that the solution has the same specific heat as liquid water, i.e., 4.18 j/g·k.
The final temperature of solid sodium hydroxide dissolves in water is 355.88 kelvin.
A given amount of matter's heat capacity is the amount of energy needed to raise its temperature by one degree Celsius. While the heat capacity of 1 mole of a substance is known as its molar heat capacity, the heat capacity of 1 gram of a substance is referred to as its specific heat capacity (or specific heat). The equation q = mcT, where m is the mass of the sample, c is the specific heat, and T is the temperature change, can be used to determine how much heat is gained or lost by a sample (q).
Given
Mass of NaOH = 13.9 g
Mass of water = 250 gram
Specific heat of the solution = 4.18 j/g·k
Initial temperature = 23.0 °c or 296 kelvin
Heat evolved in process = −44.4 kj/mol
Q = mc (T₂ - T₁)
−44400 j/mol = 263.9 x 4.18 j/g·k x (T₂ - 296k)
T₂ = 355.88 k
Hence, final temperature of NaOH solution is 355.88 kelvin.
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Draw the structures of organic compounds a and b. Indicate stereochemistry where applicable.
The steric hindrance shown here for butene and 1,2 dibromobutane is cis 2 butene y trans 2 butene.
The better electricity price (and slower response rate) because of the method of large atoms or businesses in a chemical response, as compared to a comparable response related to smaller atoms or businesses.
Steric dilemma is the slowing of chemical reactions because of steric bulk. It is generally manifested in intermolecular reactions, while dialogue of steric outcomes frequently recognition on intramolecular interactions. Steric dilemma is frequently exploited to manipulate selectivity, which include slowing undesirable side-reactions.
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12.7 l of argon at 33°c and 735 torr are dissolved in enough water to give a final volume of 0.750 l. what is the molarity of the resulting solution?
The molarity of the resulting solution is 0.65 M.
Which molarity is it?To be able to comprehend what we mean by the molarity of a solution, we must first go back in time. We are aware that molarity refers to the concentration of the component in the solution. In this situation, it's important to be aware that the molarity can only be represented in terms of moles per litre.The number of moles of the gas must now be determined, and this can only be done by applying the ideal gas equation, which is what we will be able to accomplish in this issue.PV = nRT
Pressure is P.
Volume is V.
The number of moles is n.
Gas constant R
Temperature is T
n = PV/RT
n = 0.97 * 12.7/0.082 * 306
n = 12.3/25.1
N=0.49 moles.
Number of Mole/Volume Equals Molarity of the Solution
0.49 moles/0.750 liters
= 0.65 M
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Select the intermolecular force that is overcome when hexane is converted from a liquid to a gas. - London dispersion forces -dipole-dipole forces -hydrogen bonding -ion-dipole forces
The London dispersion force is the intermolecular force that is overcome when hexane is changed from a liquid to a gas.
The London dispersion force is what holds molecules together. The London dispersion force is the main force since hexene is a nonpolar molecule. The intermolecular force that results from the electrostatic force of attraction acting between atoms is known as the London dispersion force.
The weak force of attraction is London dispersion. It is a transitory force brought on by attractions. Thus, the London dispersion intermolecular force in acting ion the hexane converted from the liquid to the gas.
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What is the number of mole for 22.4 l gas at STP?
Answer:
1 mole
Explanation:
This very useful relationship is often used in the working with gases. At STP, all gases occupy 22.4 liters. It is a very useful conversion factor that is very useful in gas law calculations.
suggest a reason for why the addition of bromine to fumaric acid requires a high temperature while the other substrates tested reacted at room temperature?
Rising in temperature accelerates the formation of fumaric acid while decreasing the final yield. Thus, the addition of bromine to fumaric acid requires high temperature.
In the presence of a relatively small amount of bromate, maleic acid in aqueous sulfuric acid isomerizes catalytically to fumaric acid in the dark at room temperature. The concomitant presence of a suitable amount of bromine in CCI, phase raises the rate and yield significantly. The yield and rate of isomerization depend on the relative amounts of maleic acid, bromate, bromine, and sulfuric acid. For a favorable condition, nearly 90% yield can be obtained.
The presence of cumene or benzene inhibits the isomerization. Hypobromous acid is proposed to play a major role in catalyzing the isomerization. A mechanism is proposed to rationalize the experimental results.
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What are strong and weak acids? In the following list of acids, separate strong acids weak acids: Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid.
Strong acid : hydrochloric acid , sulphuric acid and nitric acid.
weak acid : citric acid , acetic acid and formic acid.
The strong acids are those which completely ionizes in the aqueous solution. the strong acid will losses more H⁺ ion when it dissolved in the water. The weak acid are those which are partially ionizes in the aqueous solution. the strong acid will losses few H⁺ ion when it dissolved in the water.
strong acids weak acids
hydrochloric acid citric acid
sulphuric acid formic acid
nitric acid acetic acid
Thus, citric acid , acetic acid and formic acid are the weak acid and hydrochloric acid , sulphuric acid and nitric acid are the strong acids.
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Calculate the specific heat capacity for a 13.7-g sample of nickel that absorbs 361 j when its temperature increases from 28.4 °c to 87.8 °c.
The specific heat capacity for a 13.7g sample of nickel that absorbs 361 j when its temperature increases from 28.4 °c to 87.8 °c is 0.443.
The relation between specific heat capacity, mass of sample and change in temperature.
Q = m × C×T
Given
Heat given to sample = Q = 361J
Mass of sample = m = 13.7g
Initial temperature = 28.4 °c
Final temperature = 87.8 °c
Change in the temperature = 59.4 c
361J = 13.7g x C x 59.4
C = 0.443
Hence, specific heat capacity for a 13.7g sample of nickel is 0.443.
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when the lobes of two p orbitals are in the same phase and overlap side-by-side, the orbital that is formed has a _____ dissociation energy compared to the σ∗ molecular orbital formed from the out-of-phase direct overlap of the two p orbitals.
The orbital that is created when the lobes of two p orbitals overlap side by side while being in phase with one another has a lower dissociation energy than the molecular orbital created when the two p orbitals are directly in phase with one another.
What do you call it when two atoms share electrons and overlap their electron shells to form a molecule?When two atoms share a pair of electrons, a covalent bond is created. The electron pair is drawn to both of the nuclei, which keeps the atoms together.
Exactly what kind of orbital overlap produces the strongest covalent bond?The strongest bond is produced by the head-on overlapping of 2p2p orbitals because the electron density is highest along the bond's axis.
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What are the 3 types of chemical bonds and which is the strongest?
A chemical bond can be formed by exchange of electrons, sharing of electrons.
There are majorly three types of chemical bonds.
These are:
Ionic Bond,
Covalent Bond,
and Metallic Bonds.
And out of these three types of bonds, Ionic Bonds are the strongest bonds.
Ionic Bond: When an atom lose or gain the electron to attain the stability it forms ions and the attractive forces between two oppositely charged ions is known as ionic attractions or electrostatic attractive forces.
and such formed bonds are known as ionic bonds.
An ionic bond is formed when the difference between the electronegativities of two atoms is high as an electron transfer to occur to form the ions.
Covalent Bond: A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.
A covalent bond is formed when the electronegativity difference of two atoms is too small for an electron transfer to occur to form ions.
Metallic Bonds: Metallic bonds are made up of electrostatic attraction between metal cations and the delocalized electrons. Metallic bond is collective sharing of valence electrons between several positively charged metal ions.
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What is meant by the iterative process?
The iterative process is the practice of building, refining, and improving a project, product, or initiative. Teams that use the iterative development process create, test, and revise until they're satisfied with the end result.
The iterative process is a technique research and development teams use to help them optimize their products, services and business processes. The process involves repeated trial-and-error style cycles, where researchers adjust each cycle according to what they learned in the previous iteration.
By using this method, teams can design planned changes for their processes and encourage steady improvements toward an end goal. Careful planning and consideration of feedback can help teams conduct successful iterative processes.
Typically, business development and marketing research professionals use the iterative process to help them address design concerns, improve business strategies, optimize product features or quickly adjust to market changes.
The method can used for a variety of businesses and applications. Teams in marketing, software development, engineering, education or design might all use this process to analyze products or processes within their business.
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The______layer lets the wavelengths of light conducive to life to pass through, while filtering out those that are harmful,
like most of the ultraviolet waves.
A. insolation
B. weather
C. air
D. conduction
E. ozone
F. ecological
G. atmosphere
H. sun
I. convection
J. tilts
Answer:
E. OZONE
Explanation:
Of more importance to us, ultraviolet photons have enough energy to damage or destroy DNA, visible and infrared photons do not. When we absorb visible or infrared photons the energy carried by the photon goes into heating us up, but will not permanently damage our cells like ultraviolet photons can.
answer is E. Ozone
If Vanadium lost an electron how would it's electron configuration change? Why?
Answer:
Vanadium is a transition metal, so it can lose an electron from its outermost energy level to form a positively charged ion.
If Vanadium loses an electron, its electron configuration would change to reflect the loss of an electron.
For example, the electron configuration of Vanadium in its neutral state is [Ar] 3d^3 4s^2.
If it loses an electron, its electron configuration would change to [Ar] 3d^3.
This is because the lost electron would come from the 4s orbital, which is the outermost energy level of Vanadium.
Explanation:
Given the reactant side of the total ionic equation for the neutralization reaction of sodium hydroxide ( NaOH ) with hydrochloric acid ( HCl ), write the total ionic equation (also known as the complete ionic equation) by entering both the reactant and the product species, separated by the reaction arrow.
Na+(aq)+OH−(aq)+H+(aq)+Cl−(aq)→ ?
Be sure to include the charges on the ionic species and the physical state of all the reactant and product species.
Na⁺(aq)+OH⁻(aq)+H⁺(aq)+Cl⁻(aq)→ Na⁺(aq) + Cl⁻ (aq) + H⁺ (aq) + OH⁻ (aq) is the total ionic reaction.
What is reaction?The reaction is a process that leads to the chemical transformation of one chemical substance to another.
Just to help to understand what is happening here, here the complete non-ionic reaction is shown
equation for the neutralization reaction of sodium hydroxide ( NaOH ) with hydrochloric acid ( HCl ), write the total ionic equation (also known as the complete ionic equation) by entering both the reactant and the product species, separated by the reaction arrow.
NaOH (aq) + HCl (aq) → NaCl (aq) + H₂O
Now, you have to separate the ionic substances into the ions, which gives the desired answer:
Na⁺(aq)+OH⁻(aq)+H⁺(aq)+Cl⁻(aq)→ Na⁺(aq) + Cl⁻ (aq) + H⁺ (aq) + OH⁻(aq)
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what are phosphorus and nitrogen primarily used for? explain why these elements are so important (5 points).
A ample of ga at 20ºC ha a volume of 10 L and exert a preure of 912 mm Hg. How many mole
of ga are in the ample?
a. 0. 3 mol c. 0. 8 mol
b. 0. 5 mol d. 1. 00 mol
The Number of moles present is 0.5mol.
What is ideal gas law?
The general gas equation, also known as the ideal gas law, is the equation of state for a fictitious ideal gas. The equation for the ideal gas's relationship to pressure P, volume V, temperature T, and number of moles n is known as the ideal gas law.
Use P V = n R T
R = 0.08206 L -atm /mol -K when the pressure is in atmosphere atm, the volume is in litres L, and the temperature is in Kelvin K.
One atm is equal to 760.0 mm Hg, so depending on how the pressure changes, there will either be a division or multiplication.
Divide the value in mmHg by 760.0 mmHg/atm to convert it to atm.
P= 912mmHg /760mmHg/atm=1.2atm
to convert °C to kelvin,
K=°C +273= 20+273=293K
R=0.08206
Add these values to given equation,
n=PV/RT
= 1.2×10÷0.08206×293
= 12÷24.02
=0.5mol
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What is the percent yield of the reaction? Type in the answer using 3 significant figures.
Answer:
90.3%
Explanation:
What is the solubility of potassium chloride in 20 g of water at 80 C?
In 20 g of water at 80 C, potassium chloride dissolves with a solubility of 0.25. One or more solutes combined uniformly in a solvent form a solution. Solubility is the quality that enables molecules to dissolve.
Consequently, "solubility" can be described as a substance quality. The metal halide salt potassium chloride (KCl, often known as potassium salt) is made up of both potassium and chlorine. It has a vitreous crystal look and is odourless or colourless. The potassium chloride easily dissolves in water, and the flavour of its solutions is similar to salt. An old dried lake is a source of potassium chloride. A homogeneous mixture is a sort of mixture in which all of its constituent parts are present in the same amounts inside the sample.
20/80 = 0.25
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The mineral takes up 2.0 mL of
space in the graduated cylinder.
What is the volume of the
mineral piece in cubic
centimeters?
volume = [?] cm³
The volume of the mineral piece in cubic centimeters (cm³), given that it takes 2.0 mL of space in graduated cylinder is 2.0 cm³
How do I determine the volume of themineral piece in cm³?To obtain the volume of the mineral piece in cubic centimeters (cm³), we must convert 2.0 mL to cubic centimeters (cm³).
This can be obtained as illustrated below:
Volume (in mL) = 2.0 mLVolume (in cm³) =?We can convert 2.0 mL to 2.0 cm³ as shown below:
From conversion scale identity,
1.0 mL = 1.0 cm³
Therefore,
2.0 mL = 2.0 cm³
From the above illustration, we can conclude that the volume (in cm³) is 2.0 cm³
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