The time taken for a given amount of 32P to decay to one-eight of its original activity is 42 days.
A substance's half-life is the amount of time it takes for half of it to decompose. Given that each half-life period diminishes the activity by a factor of 2, if a given amount of a material with a half-life of 14 days decays to one-eighth of its initial activity, it must have gone through three half-life periods. Therefore, it would take 14 x 3 = 42 days for a given amount of 32P to decay to one-eighth of its initial activity.
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The statement "atoms have a small, dense nucleus" is true. What evidence do scientists use to prove this statement as true?
Most alpha particles shot at gold foil go straight through, without any changes in their direction.
The particles ejected in Thomson's experiment bent away from the negatively charged plates, but toward positively charged plates.
A few alpha particles shot at gold foil bounce in the opposite direction
No matter which element Thomson put in a cathode ray tube, the smae negative particles wit the same properties (such as charge and mass) were ejectected.
In the gold foil experiment, alpha particles shot at gold foil bounced in the opposite direction from a gold foil which indicated atoms have a small, dense nucleus.
What is the gold foil experiment?Rutherford’s α-particle scattering or gold foil experiment changed our perception of the atomic structure of an atom. Rutherford bombarded beams of α-particles at thin gold foil and observed how the α-particles scattered from the gold foil.
Rutherford showed that the atom has the most empty space with the nucleus at the center and electrons rotating around the atomic nucleus. Highly charged α-particles passed straight undeflected through the foil. This will be the expected result if the plum pudding model of Thomson was correct.
A few charged alpha particles were deflected backward direction leading to the positive charge concentrated in a small space.
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A
Choose the correct symbol to
compare these numbers.
-4 [?] 0.589
A. <
B. >
C. =
Hello there!
Answer:
A. <
Explanation:
You should remember that all negative numbers are smaller then positive numbers. For example, -10 < 7 or -9479 < 1
-4 is a negative integer
0.598 is a positive number
So -4 < 0.598 (negative < positive)
Which of the following sets contains elements that will form ions with a charge of 2-? a. As, P, and N b. Te, S, and c. Si, P, and S d. Sr, Ca, and Be
Te, S, and c are the following sets of elements, and they will all produce ions with a charge of two (option b).
An element is what?An essential element of a totality. In chemistry, a simple substance is one that cannot be divided into smaller components or transformed into another substance. An element's fundamental building block is an atom, which is made up of protons, neutrons, & electrons. The number of atoms in an element's protons is continuous.
What do you mean by nature elements?Earth, Water, Wind, Fire, Ice, Thunder, Time, Flower, Shadow, Light, and Moon are the twelve natural elements. These simplified terminology for more advanced and complicated compounds refer to each of these elements.
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What do these two changes have in common?
a slice of banana turning brown
acid rain weathering a marble statue
Select all that apply.
Both are only physical changes
Both are only chemical changes
Both are caused by heating
Both are caused by cooling
Answer:
both are only physical changes
Answer:both are only chemical
Explanation:
Rutherford's scattering experiment demonstrated Question 9 options: the existence of protons. the existence of electrons. the existence of neutrons. that most of the mass of an atom is in its nucleus. that the charge-to-mass ratio of an electron is constant.
He came to the conclusion that mass and positive charge are concentrated at the center of the atom from a small number of alpha particles deflected by huge angles with a 180.
Rutherford discovered that most positively charged alpha particles in his gold foil experiment passed straight through the foil without being deflected, leading him to believe that the majority of the atom's space is largely empty.
He came to the conclusion that mass and positive charge are concentrated at the center of the atom because there are few alpha particles that are deflected by huge angles with a 180. Rutherford Atomic Model - J. J. Thomson's "plum pudding" model was unable to account for some experimental findings related to the atomic structure of elements. British scientist Ernest Rutherford performed.
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BRAINLIEST HELP PLEASE. 6. In order to produce CO2, a student put a sample of calcium carbonate in a flask and
added hydrochloric acid using the following equation:
CaCO3 + 2HCI- H2O + CO2 + CaCl2
The student finds the mass of CO2 generated in the lab to be 100 g. If the student
began with 200 g of HCl and excess CaCO3, what was the percent yield of CO2?
On adding 200g hydrochloric acid to excess calcium carbonate, the percent yield of carbon dioxide is equal to 82.84%.
200g of HCl was added to an excess amount of calcium carbonate to produce 100g of carbon dioxide along with water and calcium chloride. The reaction is written as:
CaCO₃ + 2HCl → H₂O + CO₂ + CaCl₂
Since calcium carbonate is excess, two moles of hydrochloric acid gives rise to one mole of carbon dioxide.
To calculate the percent yield, we can use stoichiometry,
The molar mass of hydrochloric acid = 36.46 g/mol
The molar mass of carbon dioxide = 44.01 g/mol
To calculate theoretical yield,
200g HCl/1 × 1 mole HCl/36.46g HCl × 1 mol CO₂ /2mol HCl × 44.01 mol CO₂/ 1 mole CO₂
= 120.707 g
To calculate the percent yield,
The amount of CO₂ produced = 100g
Dividing 100 by the theoretical yield
= 100/120.707 = 0.8284
Now multiplying the value by 100
= 0.8284 × 100 = 82.84 %
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When using a TSO-C129 or TSO-C196 GPS for navigation and instrument approaches, any required alternate airport must have
TSO-C129 and TSO-C196 refer to non-WAAS GPS systems. TSO-C146 refers to WAAS-enabled GPS systems. If non-WAAS GPS is used for navigation and instrument approaches, all required alternate airports must have non-GPS approved operational instrument approach procedures.
TSO-C129 - Airborne Auxiliary Navigation Sensor for Global Positioning System equipment with airborne extensions. TSO-C196 – Auxiliary airborne navigation sensor for GPS units with airborne augmentation.
TSO certification means minimum performance standards for certain materials, parts and equipment used in commercial aircraft. Authorization to manufacture materials, parts, or equipment in accordance with TSO standards is referred to as TSO authorization.
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Why does metal reactivity decrease from left to right?
Metal reactivity decreases on moving from left to right in the modern periodic table due to the decrease in atomic size and inability to lose valence electrons.
Metals have the tendency to lose electrons and form cations. In the modern periodic table, consisting of 7 horizontal periods and 18 vertical groups, when we move left to right across a period, the size of atoms decreases and the nuclear pull also increases due to which the elements cannot readily lose electrons and show metallic property.
Hence, on moving from left to right in a period, metallic character decreases and non-metallic character increases.
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A student increases the temperature of 300 cm balloon from 30 cm to 60 cm what will the new volume be of the balloon be(remeber to be careful with the units. )
After solving the equation: The new volume of the balloon will be 600 cm3.
What is volume?Volume is a measure of the three-dimensional space occupied by a substance or object. In chemistry, volume is most commonly measured in liters (L). It is used to measure the amount of a substance that is present. For instance, when performing a reaction, the volume of the reactants is measured to determine the molar amounts of the reactants.
This is because the volume of a balloon is directly proportional to its temperature. So when a balloon is heated, the volume increases. In this case, the balloon's temperature was increased by 30 cm, so the volume was increased by 300 cm3 (30 cm x 10 cm3, since the volume of a balloon is proportional to its temperature to the power of 3). Thus, the new volume is 600 cm3 (300 cm3 + 300 cm3).
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which of the following molecules has the most polar bond between the bonded atoms in terms of greatest and hf hcl hbr hl
HCl is the most polar due to the high electronegativity of Cl.
Hydrogen chloride is a diatomic molecule, composed of a hydrogen atom, H, and a chlorine atom, Cl, joined by a polar covalent bond. The bond is a polar covalent bond because the chlorine atom is much more electronegative than the hydrogen atom.
Positively charged protons in the nucleus attract negatively charged electrons. As the number of protons in the nucleus increases, the electronegativity, or attractive force, increases. Therefore, electronegativity increases in a row from left to right on the periodic table.
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What is the name of the systematic approach that scientists use to understand the natural world?
a law
the scientific method
a hypothesis
a theory
It would be due to the scientific method
Hope this helps :)
Identify the methods used to monitor a reaction as it occurs in the reaction flask. polarimeter O A spectrometer OB pressure measurement Ос. D. all of the above choices are correct
The methods used to monitor a reaction as it occurs in the reaction flask are d) all the above
A polarimeter is an analytical hardware component that measures the polarization of light and is used to analyze the optical activity of chemicals. Optical activity refers to the ability of a material to rotate polarized light and the extent to which such a phenomenon occurs.
A spectrometer is one of the scientific instrument/method used to separate and measure the spectral components of physical phenomena. A spectrometer is a broad term often used to describe an instrument that measures a continuous variable of a phenomenon whose spectral components are mixed in some way.
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What are 3 elements that are highly reactive?
The three elements that are highly reactive belongs to alkali metals i.e., s-block elements that are lithium, sodium and potassium.
The elements that belongs to s block elements are hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). The nature of alkali metals is soft and shiny in appearance. They have low melting point and are highly reactive in nature and usually tarnish when exposed to air. Sodium (Na) is the most reactive element since it's valence electrons are not tightly held together in the atom. The three elements that are highly reactive are Lithium (Li), Sodium (Na), and potassium (K). The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive
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i need help asap now answer all blanks
Answer:
2
Explanation:
You want the coefficient of silver iodide in the equation ...
_AgI +_Na₂S ⇒ _Ag₂S +_NaI
Balanced equationThe equation is balanced when the numbers of each of the species is the same on each side of the equation.
We can write four equations in the four unknowns to find the coefficients, or we can use a little guesswork.
If we suppose the coefficient of silver sulfide (Ag₂S) is 1, that tells us the coefficient of silver iodide (AgI) will be 2. If that is the case, then there are two atoms of iodine that will make the coefficient of NaI be 2. This is consistent with the coefficient of Na₂S being 1, giving one Sulfur atom on each side of the equation.
The balanced equation is ...
2AgI +Na₂S ⇒ Ag₂S +2NaI
The coefficient of silver iodide is 2.
__
Additional comment
If the reaction is ...
a·AgI + b·Na₂S ⇒ c·Ag₂S + d·NaI
We can write the relationships between the coefficients as follows. This ultimately gives rise to 3 equations in 4 unknowns, so the choice of any given coefficient is arbitrary. We choose to use the smallest integers that satisfy the conditions.
The balance for Ag is ...
a = 2c
The balance for I is ...
a = d
The balance for Na is ...
2b = d
The balance for S is ...
b = c
Then, in terms of 'a' and 'b', we have ...
a = d = 2b = 2c
For b = c = 1, a = d = 2, as we determined above.
The reaction of ethane gas C2H6 with chlorine gas produces C2H5Cl as its main product along with HCl. (In addition, the reaction invariably produces a variety of other minor products, including C2H4Cl2, C2H2Cl3, and others. Naturally, the production of these minor products reduces the yield of the main product.) (a) Write out the complete, balanced chemical reaction of main reaction taking place. (b) Calculate the percent yield of C2H5Cl if the reaction of 300. grams of ethane with 650. grams of chlorine produced 490. grams of C2H5Cl.
a) The balanced equation is :
C₂H₆ + Cl₂ ---> C₂H₅Cl + HCl
b) The percent yield is the 83.0 % %.
a) The balanced equation is given below :
C₂H₆ + Cl₂ ---> C₂H₅Cl + HCl
b) mass of the ethane = 300 g
molar mass of the ethane = 30 g/mol
moles of the ethane = 300 / 30
= 10 mol
mass of chlorine = 650 g
molar mass of the chlorine = 71 g /mol
moles = 650 / 71
= 9.15 mol
it is clear the the chlorine is the limiting reactant.
1 mole of the chlorine produces the 1 mole of the C₂H₅Cl
moles of the C₂H₅Cl = 9.15 mol
mass of the C₂H₅Cl = 9.15 × 64.5
= 590.175 g
The percent yield = (experimental yield / theoretical yield ) × 100 %
= ( 490 / 590 .175 ) × 100 %
= 83.0 %
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Calculate the frequency of a photon with an energy of 4. 26 x10-19 J and a wavelength of 4. 67 x 10-7m.
[E= 6. 626 x 1034 x frequency C(3. 0 x 108 m/s) = wavelength x frequency]
The frequency of a photon with an energy of 4. 26 x10-19 J and a wavelength of 4. 67 x 10-7m. [E= 6. 626 x 1034 x frequency C(3. 0 x 108 m/s) = wavelength x frequency] is 28.22 × 10¹⁵hz.
So formula is :-
Energy of photon, E=hc/λ or λ=hc/E
E = hν = hc/λ,
Where, h=6.626×10−³⁴Js,c=3×10⁸
By putting all these values, we get:-
4.26× 10-¹⁹ = 6.626×10-³⁴ × ν
v = 4.26 × 6.626 × 10¹⁵
= 28.22 × 10¹⁵ hz
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which of the folowing molecules has the most polar bond between the bonded atoms in terom of greatedst end
The correct response is b) N - H. Because nitrogen is one of the most electronegative elements in the periodic table, its bond with hydrogen will be the most polar of all.
What exactly is a polar bond?A polar covalent bond is a covalent association in which the atoms' electron attraction is uneven, resulting in unequal electron sharing. In a polar covalent bond, also known as a polar bond, the distribution of electrons surrounding the molecule is no longer symmetrical. Polar covalent bonds have an unequal distribution of electrons. The difference in electronegativity between the two elements would be between 0.4 and 1.7. The electronegativity gap between polar and nonpolar bonds is less than 0.4.
In this case, the right answer is b) N - H. Because nitrogen is one of the periodic table's most electronegative elements, its bond with hydrogen will be the most polar of all.
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How popular is hydroelectric power?
Hydroelectric power is one of the oldest and most widely used renewable sources of energy.
Globally we see that hydropower is by far the largest modern renewable source. Every country's top priority is to generate hydroelectric power so they have to rely less on nuclear and coal power plants.
Hydroelectric power is generated by using the elevation difference, created by a dam or diversion-like structure of water flowing in on one side and out, far below, on the other side.
If we talk about some countries, Hydropower currently generates 31.5% of total U.S. renewable electricity generation.
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how many carbon atoms are in 2.12 mol of propane. how many hydrogen atoms are in 2.12 mol of propane
There are 5,944 carbon atoms in 2.12 moles of propane, and 15,528 hydrogen atoms in 2.12 moles of propane.
What is carbon?
Carbon is an element that occurs in nature and is essential for life. It is the fourth most abundant element in the universe and is present in all living organisms. Carbon exists in many different forms, including graphite, diamond, amorphous carbon, and fullerenes. Carbon is a key component of organic molecules, which are the building blocks of life. Carbon also plays an important role in the global carbon cycle.
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Which of the following require(s) resonance structures to more accurately represent their electron arrangements
The correct representation about resonance structures is that The structure of the species cannot be correctly predicted by a single resonance structure and the only way resonance structures vary is in the way the electrons are arranged.
In valence bond theory, resonance is defined as a hybrid structure formed by combining a variety of contributing structure into a resonance hybrid. Because orbitals overlap, resonance happens. Pi bonds, created when two 2p orbitals overlap, are the building blocks of double bonds. These pi orbitals' electrons are delocalized since they will be dispersed across more than two atoms.
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Select the correct answer. specific heat is the amount of heat required to raise the temperature of a material by 1°c per what unit?
a. volume
b. joule
c. mass
d. pressure
e. density
Specific heat is the amount of heat required to raise the temperature of a material by 1°c per mass
Specific heat is defined as the amount of heat energy required to elevate the temperature of a material by 1°C per unit mass.
It is a material's physical attribute. The joule per kelvin per kilogram (J/K/Kg) is the standard international measurement of heat capacity.
If a substance has a high specific heat, it simply implies that it will take a long time to heat up, but it will also take a long time to cool down once heated. Water has the highest specific heat value.
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Which of the following elements can be prepared by electrolysis of their aqueous salts: O copper O fluorine O silver O nitrate O potassium O calcium O iodine
O copper of the following elements can be prepared by electrolysis of their aqueous salts
What are the byproducts of aqueous solution electrolysis?H+ ions are drawn to the cathode during the electrolysis of water, where they pick up electrons to create hydrogen gas. The oxygen gas is formed when OH-ions are drawn to the anode and lose their electrons.
What three byproducts of electrolysis are there?Sodium chloride solution electrolysis is a significant industrial process. Chlorine gas is created at the positive electrode; hydrogen gas is created at the negative electrode; and an alkali is left in the solution as three valuable chemicals.
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At one sewage treatment plant, bacteria cultures produce 1000 L of methane gas per day at 1.0 atm pressure. What volume tank (V2) would be needed to store one day's amount of gas at a pressure of 5.0 atm?
At a pressure of 5.0 atm, IS 200 L of gas would need to be stored in the volume tank (V2).
How to find the volume?The mass of a body can be calculated from its volume using density, and vice versa. The mass is equal to the volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). Use a laboratory scale to weigh the masses, or use the density formula D = m/V to convert the solvent volume to mass. Find your ultimate volume by multiplying the solute and solvent masses.Volume, which is measured in cubic units, is the area in three dimensions that matter occupies or that is encircled by a surface. Cubic metres (m3), a derived measure, are used as the SI unit of volume.To learn more about volume, refer to:
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what is the concentration of HCl solution if 20.4 mL of a 1 M NaOH solution was needed to completely react with 25 ml of hcl
The concentration of the HCl solution is 0.816 M (or 816 mM).
To determine the concentration of the HCl solution, we can use the balanced equation for the neutralization reaction between HCl and NaOH:
HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
This reaction is a neutralization reaction, which means that the number of moles of H+ ions (from the HCl) is equal to the number of moles of OH- ions (from the NaOH).
Given that 20.4 mL of a 1 M NaOH solution was needed to completely react with 25 ml of HCl, we can use the volume and molarity of the NaOH solution to determine the number of moles of OH- ions:
Molarity = moles of solute/litres of solution
Moles of OH- = (20.4 mL x 1 M) / 1000 mL/L = 0.0204 moles
Since the number of moles of H+ ions is equal to the number of moles of OH- ions, we can use the number of moles of OH- to determine the number of moles of H+ ions:
moles of H+ = moles of OH- = 0.0204 moles
We can then use the number of moles of H+ ions and the volume of the HCl solution to determine the concentration of the HCl solution:
Molarity = moles of solute/litres of solution
concentration of HCl = moles of H+ / (25 mL / 1000 mL/L) = 0.0204 moles / 0.025 L = 0.816 M (or 816 mM)
Therefore, the concentration of the HCl solution is 0.816 M (or 816 mM).
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*SHOW YOUR WORK*
What is the molarity of a solution made up of 15.5 mol of ammonium sulfate dissolved in enough water to make 45 liters of solution?
Taking into account the definition of molarity, the molarity of a solution made up of 15.5 mol of ammonium sulfate dissolved in enough water to make 45 liters of solution is 0.34 moles/L.
Definition of molarityThe molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species and indicates the number of moles of solute contained in one liter of solution.
The molarity of a solution is calculated by:
molarity= number of moles÷ volume
Molarity is expressed in units moles/L.
This caseIn this case, you have:
Number of moles= 15.5 molesVolume= 45 LReplacing in the definition of molarity:
molarity= 15.5 moles÷ 45 L
Solving:
molarity= 0.34 moles/L
Finally, the molarity of the solution is 0.34 moles/L.
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How would you name this organic compound?
I found a couple ways to name it but I don't know which one's correct.
diatomic elements are important. what makes them different from other elemental substances?
Diatomic elements are important because they make up a significant portion of the Earth's atmosphere and are crucial for many biological and chemical processes.
Diatomic elements are elements that exist in nature as molecules made up of two atoms of the same element, such as H2, O2, N2, and F2.
A diatomic atom is one that cannot exist on its own. There are no single O atoms floating around in the sky. Because O atoms must exist in pairs, oxygen occurs as O2. These atoms are too unstable to live on their own.
This elements are different from other elemental substances because they are composed of multiple atoms of the same element, rather than a single atom or a mixture of different elements.
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Sodium chloride reacts with silver nitrate. Type of reaction ______________________________ Balance chemical equation:
Sodium chloride reacts with silver nitrate. NaCl + AgNO3 → AgCl + NaNO3
intermolecular forces present in it.
The attracting and repellent forces that develop between the molecules of a substance are known as intermolecular forces or IMF for short. Individual molecules of a substance interact with one another through the mediation of these forces.
Most of the physical and chemical features of matter are caused by intermolecular forces.
An intermolecular force is an attractive force that develops between the protons or positive parts of one molecule and the electrons or negative parts of another molecule. This force affects a substance's many physical and chemical properties. The strength of a material's intermolecular forces directly relates to the boiling point of that substance; the stronger the intermolecular forces, the higher the boiling point.
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What is the freezing point of the solution after you add an additional 1. 34 g (Use i = 2. 5 for MgCl2)
The freezing point of the solution after you add an additional 1.34 g is -0.808°C.
What is freezing point of a solution?A solution's freezing point is lower than the pure solvent's freezing point. This means that for freezing to happen, a solution needs to be cooled to a lower temperature than the pure solvent.
We use the equation: to determine the mass of the solution
Density = mass/volume
1.05 g/ml = mass/ 50ml
mass = 1.05×50
mass = 52.5g.
Percentage of magnesium chloride in the solution is 1.52%
Mass of magnesium chloride in the solution = 1.52 % of 52.5 g
Mass of magnesium chloride in the solution = 1.52/100×52.5
Mass of magnesium chloride in the solution = 0.798g
The following equation is used to determine depression in freezing point:
ΔTf = Freezing point of pure solution - Freezing point of solution
ΔTf = i Kf m
Freezing point of pure solution - Freezing point of solution = i Kf m
m = m solute × 100/M solute × W solvent
Given values,
Freezing point of pure solution (water) is 0°C
i is Vant hoff factor = 2.5
Kf molal freezing point elevation constant = 1.86°C/m
m solute given mass of solute (magnesium chloride) = [0.798 + 1.34] g
m solute = 2.138 g
M solute molar mass of solute (magnesium chloride) = 95.2 g/mol
W solvent mass of solvent (water) = [52.5 - 0.798] g = 51.702 g
substitute the given values,
0 - Freezing point of solution = 1×1.86×2.138×1000/95.2×51.702
Freezing point of solution = -0.808°C.
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Complete question is " A 50 mL solution is initially 1.52% MgCl₂ by mass and has a density of 1.05 g/ml
What is the freezing point of the solution after you add an additional 1.34 g MgCl₂? (Use i = 2.5 for MgCl₂)."
How does the arrangement of atoms affect the classification of matter?
On the basis of arrangement of atoms, the matter is classified into three states: solid, liquid and gas.
In Chemistry, there are three fundamental states of matter based on the arrangement of molecules and atoms inside it.
Generally, solids have strict and rigid arrangement of atoms as they posses strong intermolecular forces and have high melting and boiling points. solids have fixed composition of atoms.
Similarly, liquids have loose arrangement of atoms and molecules keep moving randomly in a liquid. Liquids have low melting and boiling points as compared to solids. Gases have weakest intermolecular forces and atoms are arranged randomly in them. Also, their molecules keep moving in all directions.
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