Answer:
G
Explanation:
Oxygen is most likely to be found in the atmosphere because it is the most abundant element in Earth’s atmosphere.
how to write lewis structure for h2s?
The concept of covalent bond is introduced by the scientist G.N. Lewis. The Lewis structure of hydrogen sulfide is similar to that of water.
What is Lewis structure?The structure in which the electrons of the compound are represented by dots is defined as the Lewis structure. It provide a picture of bonding in molecules in terms of the shared pairs of electrons and the octet rule.
The structure of H₂S contains two 'H' atoms and one 'S' atom. The central element is sulfur and two hydrogen atoms are linked with the help of a single bond. It has tetrahedral shape.
Thus the Lewis structure of H₂S is shown below.
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The molar mass of nacl and the molar mass of caco3 contain approximately the same number of _____.
The molar mass of NaCl and the molar mass of CaCO₃ contain approximately the same number of grams per mol.
In science, the molar mass (M) of a chemical compound is characterized as the proportion between the mass and how much substance (estimated in moles) of any example of said compound.[1] The molar mass is a mass, not sub-atomic, property of a substance. The molar mass is a normal of many occasions of the compound, which frequently fluctuate in mass because of the presence of isotopes.
Most ordinarily, the molar mass is figured from the standard atomic weight and is consequently an earthly normal and an element of the overall wealth of the isotopes of the constituent particles on the planet. The molar mass is fitting for changing over between the mass of a substance and how much a substance for mass amounts.
i()Molar of mass : NaCl: 58.5 g/mol No. of Moles = Mass / Molar mass Mass = 1 × 58.5g Therefore, mass of 1 mole of NaCl is 58.5 g.
(ii) Molecular mass of CaCO₃ = (1 × Ca + 1 × C + 3 × O) = (1 × 40 + 1 ×12 + 3 × 16) = 40 + 12 + 48 = 100 Molar mass of CaCO₃ = 100 g
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2. Specific heat capacity is
a.
the quantity of heat needed to change 1.00 g of a substance by 1.00 K.
b. the mass of a substance that 1.00 J of energy will heat by 1.00 K.
C.
the mass of a substance that 1.00 cal of energy will heat by 1.00 K.
d. the temperature change undergone when 1.00 g of a substance absorbs 4.184 J.
the quantity of heat required to melt 4.184 g of a substance.
e.
Specific heat capacity is the quantity of heat needed to change 1.00 g of a substance by 1.00 K.
Option A is correct
How do we describe Specific heat capacity?Specific heat capacity is like an objects 'thermal inertia' it is an object's resistance to an change in temperature.
Water has a very high specific heat and it takes a long time for it to lose heat and it also takes a long period of time to gain heat.
The formula for specific heat capacity, C , of a substance with mass m , is shown as C = Q /(m ⨉ ΔT) .
Where Q is the energy added and ΔT is the change in temperature.
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A titanium block (20°C) is placed in contact with a lead block (30°C), which is already in contact with an iron block (70°C).
What will happen in this situation?
O Heat will flow from the titanium to the lead to the iron until the temperatures are equal.
Heat will flow from the iron to the lead and from the lead to the titanium until the temperatures are equal.
O
Heat will flow from the titanium to the lead and from the iron to the lead until the temperatures are equal.
O Heat will flow from the lead to the titanium to the iron until the temperatures are equal.
Heat will flow from the titanium to the lead and from the iron to the titanium until the temperatures are equal.
What is the general law for the heat flow, in an ideal situation?Heat always flows from a region of higher temperature to a region of lower temperature until both regions reach thermal equilibrium. In this case, since the lead block is initially warmer than the titanium block and the iron block is initially even warmer than the lead block, heat will flow from the iron block to the lead block and from the lead block to the titanium block until all three blocks reach the same temperature.
However, it's important to note that heat will not flow directly from the iron block to the titanium block, because there is an intermediate block (the lead block) between them. Heat can only flow directly between the adjacent blocks in contact with each other, and the heat transfer process continues until all the blocks reach thermal equilibrium.
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Student Name:
Lesson Check: Weather Patterns
Date:.
10) Scientists are monitoring two colliding air masses along a frontal boundary. They are
concerned that a tornado may form.
Which data collected along the frontal boundary would best alert scientists that the two
colliding air masses may cause a tornado?
OA) strong gusty winds and cloudy skies where the fronts meet
OB)
O C)
air masses of the same temperature and altitude coming together where the fronts
meet
large differences in temperature, humidity, and air pressure on either side of where
the fronts meet
D)
many similarities in the altitude of clouds, amount of clouds, and wind direction on
either side of where the fronts meet
The data collected along the frontal boundary would best alert scientists that the two colliding air masses may cause a tornado is large differences in temperature, humidity, and air pressure on either side of where the fronts meet. Therefore, option C is correct.
What happens when two weather fronts meet?When two different air masses collide, they do not mix. They rub up against each other along a line known as a front. Because warm air is lighter, it rises when it collides with cold air. It cools at high altitude, and the water vapor it contains condenses.
A weather front is a transition zone at the Earth's surface between two different air masses. Each air mass has its own temperature and humidity profile.
Turbulence is common at a front, which is the boundary between two different air masses. Clouds and storms can form as a result of turbulence.
Thus, option C is correct.
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what is the molar mass of ferrocene?
The molar mass of the ferrocene is the 186.0 g/mol.
The molecular formula for the ferrocene is the C₁₀H₁₀Fe.
The molar mass of the carbon is 12 g/mol
The molar mass of the hydrogen is 1 g/mol
The molar mass of the Fe is 55.8 g/mol
The molar mass of the ferrocene , C₁₀H₁₀Fe is as
The molar mass of the ferrocene = 10 (12) + 10 (1) + 55.8
The molar mass of the ferrocene = 186 g/mol.
Thus, molar mass of the ferrocene that is the C₁₀H₁₀Fe is 186 g/mol.
The ferrocene, C₁₀H₁₀Fe is also called as the Dicyclopentadienyliron, this is the earliest and best known for the sandwich compounds.
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Which type of light has the highest frequency?
Gamma-rays
Microwave
Infrared
Radio
Answer:
Gamma-rays is the answer i think.
Explanation:
I just learned it in chemistry class in August.
many cell organelles, most notably the nucleus, are anchored by
You have a sample of 35.2g of MgSO4. How many moles of MgSO4 are in the sample? Show all your work
We must understand the relationship between moles, molar mass and mass to be able to solve questions with them:
[tex]n=\dfrac{m}{M}[/tex]
[tex]n[/tex] = moles[tex]m[/tex] = mass[tex]M[/tex] = molar massSolving the QuestionWe're given:
[tex]m[/tex] = 35.2 g[tex]M[/tex] = sum of Mg, S and O4: 120.368 g/mol (taken from Chemspider)Apply the formula:
[tex]n=\dfrac{m}{M}[/tex]
[tex]n=\dfrac{35.2}{120.368}\\\\n=0.292\hspace{4}mol[/tex]
Answer0.292 mol
Juniors lab group compared how different aged grass composts effected soybean plants. Containers of soybean plants were grown for 10 days. the plants were then fertilized as follows: (a) container A: 350 g of 3 month old compost, (b) container B: 350 g of 6 month old compost, (c) container C: 350 g of year old compost, and (d) container D: 0g compost. the plants received the same amount of sunlight and water each day. at the end of the 10 days the group recorded the height of the plants (cm).
from the experiment above, which of the following could be considered the control group?
container A
container B
container C
container D
from the experiment above, which of the following could be considered the correct, testable hypothesis?
1: since decomposition is necessary for the release of nutrients, the older compost will make it easier for the soybean plants to photosynthesis
2: since soybean plants photosynthesis with sunlight and water, the plants with less compost will grow taller because they have access to more sunlight
3: since decomposition is necessary for the release of nutrients, the older the compost is, the taller the soybean plants will grow
4: the older compost will rot and become toxic to the soybean plants. because of this, the 3 month old compost will help the plants grow taller
Here, the control group is D. The compost does not affect the photosynthesis of the plant but it will affect its growth. Hence, the possible hypothesis is, since decomposition is necessary for the release of nutrients, the older the compost is, the taller the soybean plants will grow.
What is photosynthesis ?Photosynthesis is the biochemical process in plants to produce the chemical energy. The reaction involves combination of water and carbon dioxide to form glucose and oxygen gas. It does not depends on the nutrients or compost from the soil.
Old compost is made by mixing organic wastes in the right proportions into piles, rows, or containers; adding bulking agents, as needed, to create air spaces; regulating temperature, moisture, and oxygen to achieve accelerated decomposition; and allowing the finished product to fully stabilize and mature through a curing process.
Therefore, the possible hypothesis for this experiment is option 3. since decomposition is necessary for the release of nutrients, the older the compost is, the taller the soybean plants will grow.
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What is the molecular geometry of so3?
The molecular geometry of SO3 is trigonal planar.
Molecular geometry is the three-dimensional arrangement of atoms in a molecule.
It is determined by the number of bonding and non-bonding electron pairs in the valence shell of the central atom. In the case of SO3, the central atom is sulfur (S), which is surrounded by three oxygen (O) atoms.
Each oxygen atom forms a double bond with the sulfur atom, giving a total of six bonding electron pairs. Since there are no non-bonding electron pairs, the molecular geometry is determined by the arrangement of the three oxygen atoms around the central sulfur atom.
The most stable arrangement is one in which the oxygen atoms are placed at the corners of an equilateral triangle, with the sulfur atom at the center. This gives the molecule a trigonal planar geometry.
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in the transition state for this compound, the negative charge is shared between the outgoing cl atoms and incoming br atoms. based on hammond's theorem, how would you expect the charge to be distributed between the two atoms?
Hammond's postulate predicts that the charge in the transition state of a reaction will be distributed in a way that minimizes the difference in electronegativity between the two atoms.
Hammond's postulate, also known as Hammond's theorem, states that in the transition state of a reaction, the charge is distributed in such a way as to minimize the difference in electronegativity between the two atoms involved in the reaction. This means that if one of the atoms is more electronegative than the other, it will pull electrons towards itself more strongly and therefore, carry a larger portion of the negative charge in the transition state. The charge distribution in the transition state will therefore be a balance between the electronegativities of the two atoms involved in the reaction.
In the case of the Cl and Br atoms, if the electronegativity difference is significant, the Br atom is likely to carry more of the negative charge. However, it is important to note that this is just a prediction and the actual charge distribution in the transition state may be influenced by other factors, such as bond length, bond angle, and electronic factors.
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is nh3 strong or weak?
Ammonia (NH₃) is a weak base.
When dissolved in water, ammonia reacts with water molecules to form ammonium ions (NH₄⁺) and hydroxide ions (OH⁻), according to the following equation:
NH₃ + H₂O ⇌ NH₄⁺ + OH⁻
Ammonia only partially dissociates in water, which means that it produces relatively few hydroxide ions compared to a strong base like sodium hydroxide (NaOH). Therefore, ammonia is considered a weak base.
The strength of a base is determined by its ability to donate hydroxide ions (OH⁻) in water, which is quantified by the base dissociation constant (Kb). The Kb value for ammonia is relatively low (1.8 x 10⁻⁵), compared to strong bases like sodium hydroxide (Kb value of 1.0 x 10¹⁴).
Overall, ammonia can still react with acids to form salts and water, but its reactivity is much weaker than that of a strong base.
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Based on the mole ratios of the substances in a chemical reaction shown, which is the correct equation for the chemical reaction?
In a chemical reaction represented by the general equation A + B → C + D, there are four distinct mole ratios that can be written.
The MOLE RATIO is a comparison of how many moles of one substance are required to participate in a chemical reaction with another substance, based on the balanced chemical equation.
What is mole ratio?
A mole ratio in chemistry is the ratio of the mole quantities of any two chemicals that are involved in a chemical reaction. The balanced chemical equation for the reaction, which displays the proportional numbers of molecules or moles of each reactant and result, is where it is generated. Stoichiometry, or the computation of the amounts of reactants and products in a chemical process, makes use of mole ratios. They can be used to forecast how much of a product will be formed from a given amount of reactant or to figure out how much of one material is required to react completely with a given amount of another substance.To know more about mole ratio, click the link given below:
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Determine the moles of aluminium ions in 1.25mol of AI203
2.5mol of aluminium ions are in 1.25mol of AI[tex]_2[/tex]O[tex]_3[/tex]. There are precisely 6.022×10²³ elementary entities in a mole.
What is mole?The International System of Units uses the mole (symbol mol) as the unit of substance quantity (SI). How so many elementary units of a certain substance are present in an item or sample is determined by the quantity of that material.
There are precisely 6.022×10²³ elementary entities in a mole. An elementary thing may consist of an atom, an molecule, and ion, and ion pair, or maybe a subatomic particle like an electron dependent on what the material is. AI[tex]_2[/tex]O[tex]_3[/tex] contains 2 mole of aluminium ion
mole of AI[tex]_2[/tex]O[tex]_3[/tex] =1.25mol
mole of aluminium ion =2×1.25mol =2.5mol
Therefore, 2.5mol of aluminium ions are in 1.25mol of AI[tex]_2[/tex]O[tex]_3[/tex].
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The molecular formula of most monosaccharides represents a multiple of:a. CHOCHO.b. CHO2CHO2.c. CHO3CHO3.d. CH2OCH2O.e. CH3OCH3O.
Monosaccharides, also called sugars, have the typical molecular formula [C([tex]$$H_2O[/tex])]n.
What is the molecular formula of most monosaccharides?Monosaccharides, also called sugars, have the typical molecular formula [C([tex]$$H_2O[/tex])]n, where n = 3–7, and can be classified as either aldehyde-aldoses or ketoses based on whether they contain an aldehyde or ketone functional group.
Examples of monosaccharides include glucose, fructose, galactose, ribose, and deoxyribose. Monosaccharides are one sugar unit (hexose sugar).
The simplest type of carbohydrates are monosaccharides. Monomers called monosaccharides are able to be combined to create more intricate carbohydrates. Carbon, hydrogen, and oxygen make up the molecules that make up monosaccharides.
The monosaccharides consist of simple sugars and their byproducts. The building blocks of more complicated molecules, they are the basic carbohydrate units. At least one hydroxyl group, an aldehyde (RCHO) or ketone (RCOR) group, and carbon atoms with hydrogen atoms attached are the components of monosaccharides.
Therefore, the correct answer is option a. CHOCHO.
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11.8 Aromatic compounds
1. Name each compound using both the common name and the IUPAC name.
1.
2.
3.
CI
Oo
CI
Br
NO,
2. Name each compound using both the co
CH₂
NO₂
The compound CO has name carbon monoxide while CH₂ and NO₂ respectively ethylene and nitrogen dioxide respectively.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
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What are strong electrolytes list ?
Strong electrolytes are substances that completely dissociate into ions when dissolved in water, resulting in a high concentration of ions in solution. Here are some examples of strong electrolytes:
What are strong electrolytes ?Strong bases include potassium hydroxide and sodium hydroxide (NaOH) (KOH)Salts that can be dissolved include calcium chloride, potassium sulphate, and sodium chloride (NaCl) (CaCl2)Aluminum chloride and magnesium nitrate are examples of ionic compounds (AlCl3)It's significant to remember that not all substances that dissolve in water function as powerful electrolytes. Weak electrolytes are substances that only partially breakdown into ions. Also known as non-electrolytes, some substances like nonpolar molecules do not dissociate at all.
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Precipitation of water on the land surface leads directly to ________.
A cylinder and its dimensions are shown. One equation for calculating the volume of a cylinder is V = Bh , where B represents the area of the base of the cylinder. Which expression can be used to find the value of B, in square centimeters, for this cylinder?
The expression that can be used to find the value of B in square inches for this cylinder is A) π(8.3)2.
What is the area of a cylinder?The combined area of a cylinder's curving surface and its two circular bases is known as the cylinder's area. The surface area of a cylinder is determined using the following formula:
A = 2πrh + 2πr²
We need to find the expression to calculate the area of the base of the given cylinder, which has dimensions r = 8.3 meters and h = 11.1 meters.
The formula for the area of the base of a cylinder is B = πr², where r is the radius of the base of the cylinder.
So, substituting the given value of r, we get:
B = π(8.3) ²
Simplifying this expression, we get:
B = π(68.89)
B = 68.89π.
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What is the volume of 128 g of oxygen at STP?
Standard Temperature and Pressure, or STP
1 mole of any gas takes up 22.4L at STP. Answer is 89.6L
What is STP (Standard Temperature and Pressure)?
Numerous thermodynamic tabulations and computations using STP. The density, viscosity, boiling point, and other characteristics of matter will change when the temperature or pressure changes. Calculations are made simpler and comparisons are made feasible by using a single set of criteria (or "state") to tabulate these data.
It is closely connected to the idea of matter in its usual state, sometimes known as "standard circumstances." Standard state does not always refer to a particular temperature, however 25 °C (298 K) is the most typical value used.
On a safety data sheet, the initials "STP" are most frequently found following a physical characteristic of the substance, such as density, flammable limit, or vapor pressure. The SDS's Section 9 (Physical and Chemical Properties) contains information on these characteristics.
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What is the Bohr model for argon?
The Bohr model for argon is a representation of the arrangement of the electrons in the atom of the element argon.
In the Bohr model, the electrons are arranged in concentric circles around the nucleus of the atom. Each circle represents a different energy level, and the electrons are located in these energy levels according to their energy.
For argon, the Bohr model shows that there are 18 electrons in the atom. These electrons are arranged in the following way:
- 2 electrons in the first energy level
- 8 electrons in the second energy level
- 8 electrons in the third energy level.
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what is the strongest interparticle force present in a sample of h3po4?
The strongest intermolecular force in phosphoric acid is ion-dipole.
What is an ion dipole bond?
An ion-dipole bond is a type of chemical bond that occurs between an ion and a molecule with a dipole moment. Ions are charged atoms or molecules that have lost or gained one or more electrons, resulting in a net positive or negative charge. Dipole moments occur when the electrons in a molecule are not evenly distributed, resulting in one end of the molecule having a partial negative charge and the other end having a partial positive charge.
In an ion-dipole bond, the ion is attracted to the opposite partial charge on the dipole molecule. This attraction is known as an electrostatic interaction or Coulombic interaction, and it is a type of intermolecular force.
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How many moles are in 15.89 grams of CH4?
We must apply the following equation:
[tex]n=\dfrac{m}{M}[/tex]
n = molesm = massM = molar massSolving the QuestionWe're given:
m = 15.89 gM = sum of C + H4 = 16.04 (taken from Chemspider)Apply the equation:
[tex]n=\dfrac{m}{M}[/tex]
[tex]n=\dfrac{15.89}{16.04}[/tex]
[tex]n = 0.9906\hspace{4}mol[/tex]
Answer0.9906 mol
(b) The equation for the decomposition of hydrated zinc sulfate is
Zn50,-7H₂O(s)→ ZnSO (s) + 7H,01)
The student records these masses.
mass of boiling tube
= 41.64g
mass of boiling tube + Zn50,-7H₂O = 54.46g
Calculate the maximum volume, in cm³, of pure water that could be produced.
Give your answer to 1 decimal place.
[1.00 cm¹ of pure water has a mass of 1.00 gl
[M, of Zn50, 7H,0 = 287 M, of H₂O = 18]
The volume of the water is 7100 cm³
What is the decomposition reaction?A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more simpler substances. In a decomposition reaction, a reactant is broken down into two or more products, typically through the application of heat, light, or an electrical current.
Mass of the ZnSO4.7H2O = 54.46g - 41.64g
= 12.86 g
Number of moles of the ZnSO4.7H2O = 12.86 g/287.6 g/mol
= 0.045 moles
If 1 mole of ZnSO4.7H2O produces 7 moles of water
0.045 moles produces 0.045 * 7/1
= 0.315 moles
If 1 mole of gas occupies 22.4 L
0.315 moles of gas occupies 0.315 * 22.4/1
= 7.1 L or 7100 cm³
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Write the decay equation for the beta decay of uranium-232.
Answer:
Explanation:
The beta decay of uranium-232 can be represented by the following equation:
232U ------------> 232Th + 0e + v
where 0e represents a beta particle (an electron) and v represents an antineutrino.
Why is hexane non-polar?
Because it only contains carbon and hydrogen atoms, which evenly transfer electrons across all of the atoms in the molecule, hexane is a non-polar molecule.
The molecule is non-polar because electrons are distributed evenly throughout it as a result of this equitable sharing.
With the chemical formula C6H14, the hydrocarbon hexane indicates that it has six carbon atoms and fourteen hydrogen atoms. There occurs a formation of three covalent bond by using each carbon atom with hydrogen atom and one more with one carbon atom next to it.
These covalent connections, which require sharing electrons between atoms, require one or more electrons from each element.
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Atomic mass of bromine is 80 g. The mass of four moles of molecular bromine (Br2) is:
A.80 g
B.6.40 g
C.40 g
D.320 g
Atomic mass of bromine is 80 g. The mass of four moles of molecular bromine (Br₂) is 640 g. The correct alternative is not given.
To find the mass of four moles of molecular bromine (Br₂), you can use the formula:
mass = moles × molar mass
The molar mass of Br₂ is the atomic mass of bromine multiplied by two, since there are two atoms of bromine in each molecule of Br₂. So the molar mass of Br₂ is:
molar mass of Br2 = 80 g × 2 = 160 g
Now you can plug in the values for moles and molar mass into the formula:
mass = 4 moles × 160 g = 640 g
So the mass of four moles of molecular bromine (Br₂) is 640 g.
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Which substance what undergo a change of state from liquid to solid if the temperature was decreased from 30°C to -5°C?
A. Bromine
B. Water
C. Oxygen
D.Iron
The substance which will undergo a change of state from liquid to solid if the temperature was decreased from 30°C to -5°C is bromine and is denoted as option A.
What is Change of state?This is referred to as physical change in a matter and it is a reversible change and do not involve any changes in the chemical makeup of the matter.
Bromine exists as a readily-volatilized liquid at room temperature. By using a coolant at a temperature below the freezing point of bromine (m.p. = -7.2 degrees Celsius) it is possible to obtain solid bromine crystals on the surface of the cold test tube.
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Why is freezing endothermic?
Freezing is endothermic process. It involves absorption of heat from the surrounding environment.
A substance will have a freezing point and if we cooled it down below that, the particles in the substance start to lose energy and it will slow down.
So when the temperature is decreased, the kinetic energy will also decrease for the particles. They will start to move closer together.
So imagine if the particles are moving together, then the attraction or attractive force between the particles can become stronger. So this makes them arrange themselves in more orderly fashion or structure.
This requires energy because they are overcoming the intermolecular forces between the particles.
They will absorb energy from surrounding. So we can say freezing is an endothermic process.
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