PLEASE HELP ASAP, WILL GIVE BRAINIEST
1. Based on the data in figure 1. is mixture c a homogeneous or heterogeneous mixture? Explain your answer.
2. Which of the mixtures in figure 1 is a solution? Explain how you know
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Answer 1. mixture C is a heterogeneous solution.
This is because heterogeneous solution :
scatters light- solute particles are large in size as they are partially or fully insoluble in solvent and can be seen with naked eyes, so whenever light is passed through it ,path of light is visible.separates into two different layers-presence of physical boundaries in between the layers of solute and of the solvent.can be separated out by filtration- due to formation of two different layers both the layers can be separated easily with the help of filtration technique.Answer 2. mixture B is a solution.
Solutions are homogeneous solution and homogeneous solution:
doesn't scatter light- due to very small size of solute particles are not visible to naked eyes, so whenever light is passed its path is not visible.doesn't separate out into layers- solute particles are completely soluble in solvent so they do not form any layers.cant be separated out by filtration - miscibility makes it impossible to filter out the solute particles from the solvent.Related Questions
1.What percent of light passes through the sample if its absorbance A=2?
2. For the best calibration curve, the transmittance values (%T) should fall within the range from 10% to 90%. What is the approximate range of corresponding absorbance values?
3. What is the absorbance of the solution if the percent transmittance for it is 10%?
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1. The formula for absorbance is given as:
A = log (Io / I)
where A is absorbance, Io is initial intensity, and I is final light intensity
log (Io / I) = A
log (Io / I) = 2
Io / I = 100
Taking the reverse which is I / Io:
I / Io = 1 / 100
I / Io = 0.01
Therefore this means that only 0.01 fraction of light or 1% passes through the sample.
2. What is meant by transmittance values is actually the value of I / Io. So calculating for A:
at 10% transmittance = 0.10
A = log (Io / I)
A = log (1 / 0.10)
A = 1
at 90% transmittance = 0.90
A = log (Io / I)
A = log (1 / 0.90)
A = 0.046
So the absorbance should be from 0.046 to 1
3. at 10% transmittance = 0.10
A = log (Io / I)
A = log (1 / 0.10)
A = 1
Approximately how much more energy is released in a 6.5 richter magnitude earthquake than in one with magnitude 5.5?
a. 3 times
b. 300 times
c. 30 times
d. 3000 times
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Richter scale is used to determine the magnitude of an earthquake from the arrival time of P and S waves. It determines the total amount of energy released during an earthquake.
If Richter magnitude scale measures 6.5 then it produces 30 times more energy than 1 Richter scale magnitude during an earthquake. The magnitude of an earthquake is plotted on a logarithmic scale from 1 to 9 and increases 10 folds by one magnitude. If 6.5 is the magnitude, it means it is 10 times more than 5.5 magnitude earthquake. Similarly the amount of energy is calculated as 30 folds. So 6.5 magnitude will have 30 folds more energy released than that with 5.5 magnitude earthquake.
Which atom is least likely to form an ion? which atom is least likely to form an ion? carbon, c aluminum, al bromine, br phosphorus, p?
Answers
Answer:
Aluminum
Explanation:
Its the same as the top on but easier to understand
and the top one was approved so.................its right
Liquid octane reacts with oxygen gas to form carbon dioxide gas and water vapor.express your answer as a chemical equation. identify all of the phases in your answer.
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The combustion reaction of octane with oxygen forms carbon dioxide and water vapor. The chemical equation is represented as: 2C8H18(l) + 25O2(g) ➖ 16CO2(g) + 18H2O(g). Each compound's state of matter is indicated in parentheses.
Explanation:The chemical equation for the reaction of liquid octane (C8H18) with oxygen gas (O2) to form carbon dioxide gas (CO2) and water vapor (H2O) is as follows:
2C8H18(l) + 25O2(g) ➖ 16CO2(g) + 18H2O(g)
In this equation, the phases of each compound are indicated in parentheses. C8H18 is in the liquid phase (l), while O2, CO2, and H2O are all in the gaseous phase (g).
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The balanced equation is C₈H₁₈ (l) + 12.5 O₂ (g) → 8 CO₂ (g) + 9 H₂O (g). This reaction exemplifies a combustion reaction.
Liquid octane reacts with oxygen gas to form carbon dioxide gas and water vapor. The balanced chemical equation for this reaction, with phases identified, is:
C₈H₁₈ (l) + 12.5 O₂ (g) → 8 CO₂ (g) + 9 H₂O (g)
This reaction is a typical example of a combustion reaction, where a hydrocarbon reacts with oxygen to produce carbon dioxide and water, releasing energy.
The sterile saline solution used to rinse contact lenses can be made by dissolving 400 mg of nacl in sterile water and diluting to 100 ml. what is the molarity of the solution?
Answers
The molarity of the NaCl solution is calculated to be 0.0685 M.
To calculate the molarity of the solution, we need to determine the number of moles of NaCl dissolved in the solution. First, we convert 400 mg of NaCl to grams:
400 mg = 0.400 g
Using the molar mass of NaCl (58.44 g/mol), we find the number of moles:
Number of moles = 0.400 g / 58.44 g/mol ≈ 0.00685 moles
The volume of the solution is 100 mL, which we convert to liters:
Volume in liters = 100 mL / 1000 mL/L = 0.1 L
Finally, we calculate the molarity (M) of the solution:
Molarity (M) = Number of moles / Volume in liters = 0.00685 moles / 0.1 L = 0.0685 M
Therefore, the molarity of the NaCl solution is 0.0685 M.
A compound contains 3 nitrate ions for every 1 aluminum ion. what is the chemical formula?
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1 aluminium
9 nitrate
Solid iron(iii) sulfide is oxidized by oxygen gas to solid iron(iii) oxide and sulfur dioxide gas. express your answer as a chemical equation. identify all of the phases in your answer.
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Iron(III) sulfide reacts with oxygen to produce iron(III) oxide and sulfur dioxide. The reaction can be represented by this balanced chemical equation: 4 Fe2S3(s) + 11 O2(g) -> 2 Fe2O3(s) + 12 SO2(g). This is an example of a combination reaction; a type of redox reaction.
Explanation:The reaction of solid iron(III) sulfide (Fe2S3) with oxygen gas (O2) produces solid iron(III) oxide (Fe2O3) and sulfur dioxide gas (SO2). The chemical equation representing this reaction is:
4 Fe2S3(s) + 11 O2(g) -> 2 Fe2O3(s) + 12 SO2(g)
In this equation, (s) represents solid, (g) represents gas, and the numbers in front of the chemical formulas are coefficients indicating the number of moles of each substance involved in the reaction. This reaction is an example of a combination reaction, which is a type of oxidation-reduction (or redox) reaction where a substance reacts with oxygen to form oxides.
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In any balanced chemical equation, the number of each type of atom on both sides of the equation is ________.
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In any balanced chemical equation, the number of each type of atom on both sides of the equation is equal.
BALANCED CHEMICAL EQUATION:
A balanced equation is an equation that obeys the law of conservation of mass. An equation is said to be balanced when the number of atoms of each element on both sides of the equation is equal.For example, in the equation as follows:
NaOH + H2SO4 = Na2SO4 + H2OThe number of atoms of sodium, oxygen, sulphur and hydrogen elements on both sides of the equation are balanced. Therefore, in any balanced chemical equation, the number of each type of atom on both sides of the equation is equal.Learn more at: https://brainly.com/question/7181548?referrer=searchResults
When aluminum oxidizes in air, it forms aluminum oxide (ai2o3): 4ai (s) + o2 (g_ -> 2ai2o3 (s) if a 77 g sheet of aluminum oxide formed completely in excess oxygen, how many grams of aluminum were oxidized?
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4 Al + 3 O2 → Al2O3
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 78 g of aluminum were oxidized.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Stoichiometry represents the number of moles.
4 Al + 3 O[tex]_2[/tex]→ Al[tex]_2[/tex]O[tex]_3[/tex]
moles of aluminium oxide = 77 g/101.96
moles of aluminium oxide=0.75moles
The mole ratio of aluminium oxide to aluminium is 1:3
moles of aluminium= 4×0.75moles
moles of aluminium= 3 moles
mass of aluminium = moles × molar mass
mass of aluminium= 3 ×26
mass of aluminium = 78 g
Therefore, 78 g of aluminum were oxidized.
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Is the reaction mg²⁺(aq) + h₂o(l) → mgo(s) + 2h⁺(aq) endothermic or exothermic?
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The reaction is likely exothermic as bond formation is usually accompanied by release of energy. However, without enthalpy values of the reactants and products, it is hard to definitively classify the reaction.
Explanation:The reaction stated, mg²⁺(aq) + h₂o(l) → mgo(s) + 2h⁺(aq), does not directly tell us whether it's endothermic or exothermic. However, we can try to infer the nature of the reaction based on general principles. Endothermic reactions usually involve the breaking of bonds, which requires energy, whereas exothermic reactions involve the formation of new bonds, which usually releases energy. By looking at the equation, it can be inferred that a bond formation (MgO) is taking place and energy likely being released, which suggests that the reaction is exothermic. However, without specific enthalpy values of the reactants and products, it would be hard to definitively classify the reaction as endothermic or exothermic.
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Ionic compounds are electrically overall thereofre the sum of
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Which of these acids forms when wine is left exposed to oxygen for extended periods?
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An electron is on a -2.5 eV energy level. the electron is stuck by a 2.5 eV photon. What will most likely happen?
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N2(g) + o2(g) → 2 no(g) δh = +180.7 kj 2 no(g) + o2(g) → 2 no2(g) δh = −113.1 kj 2 n2o(g) → 2 n2(g) + o2(g) δh = −163.2 kj use hess's law to calculate δh for the reaction. n2(g) + 2 o2(g) → 2 no2(g).
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(1) N2(g) + O2(g) → 2 NO(g) Δh = +180.7 kJ
(2) 2 NO(g) + O2(g) → 2 NO2(g) Δh = −113.1 kJ
(3) 2 N2O(g) → 2 N2(g) + O2(g) Δh = −163.2 kJ
You want to rearrange the given reactions to match the reaction with the unknown enthalpy. Looking at what we're given, reaction (2) already has 2NO2 on the product side just like our unknown, so let's start there - it can stay as is.
However, it has 2NO on the reactant side - that's not in our unknown reaction, so we need to get rid of it somehow. There's 2NO in reaction (1), and it's on the product side, so it will cancel the 2NO on the reactants side of reaction (2). This means reaction (1) can stay as it is as well.
If you add these two reactions together, you'll get:
N2(g) + O2(g) + 2 NO(g) + O2(g)→ 2 NO(g) + 2 NO2(g)
N2(g) + 2O2(g) + 2 NO(g) → 2 NO(g) + 2 NO2(g)
N2(g) + 2O2(g) → 2 NO2(g)
The 2 NO cancels out and the individual O2's add together to get 2O2. This gives us the unknown reaction so we actually don't need to use reaction (3) at all to answer this question. In fact, it makes things more difficult because it contains N2O, which cannot be cancelled in any way with the reactions we're given.
To find the enthalpy of the unknown reaction, add the enthalpies of the reactions that work. Since we didn't have to modify either of the the first 2 reactions, you can add their original enthalpies as given:
+180.7 kJ + (−113.1 kJ) = +67.6 kJ
A team of researchers are working on a project to make a new kind of airplane fuel. During their experiment, there was an explosion that destroyed the lab. While they were cleaning up the debris, they discovered a number of pieces of frozen metal. The scientific community was amazed. The researchers were so excited to report that they had discovered a fuel that burns so hot that it becomes cold. They were not sure of the true importance of their discovery but they knew it was something that had never been seen before. The researchers quickly wrote up a report, created a press release, and applied for a patent. The news spread quickly through the world wide scientific community and soon other scientists were trying to replicate their experiment. Much to the relief of the original team or researchers, no other scientist could ever replicate their find. Would this example be considered science or pseudoscience? Why or Why not?
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And yes, it's not science if the experiment can't be repeated. In fact they should WANT it to be repeated so that you can get credit for discovering something new and then possibly harness this effect to produce useful applications.
For all we know they had a fewer of LN2 in the lab that got shredded by the blast, LN2 could certainly have frozen many things (not metal though, since metal is already solid at room temperature, (except for mercury)), and afterwards would leave no trace.
A lithium ion is much less reactive than a lithium atom because it
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What trend does the first ionization energy follow going across the periodic table?
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Explanation:
Ionization energy is defined as the energy necessary to remove an electron from a gaseous atom or ion.
Therefore, smaller is the size of an atom or ion more energy it needs to remove an electron because more is the charge on an ion smaller will be its size.
Hence, more will be the attraction between nucleus and valence electrons of the atom. So, more difficulty is faced by the atom to lose an electron. As a result, ionization energy will increase.
Across the period, there will be decrease in size of elements of the periodic table.
Thus, we can conclude that there will be increase in first ionization energy across the periodic table.
Serotonin is a compound that conducts nerve impulses in the brain. it contains 68.2 mass percent c, 6.86 mass percent h, 15.9 mass percent n, and 9.08 mass percent o. its molar mass is 176 g/mol. part a determine its molecular formula.
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Final answer:
This answer explains how to determine the molecular formula of serotonin based on its mass percent composition and molar mass.
Explanation:
Serotonin is a compound that conducts nerve impulses in the brain. To determine its molecular formula, we need to calculate the empirical formula first. Given the mass percent composition of carbon (C), hydrogen (H), nitrogen (N), and oxygen (O), we can find the empirical formula ratios and then the molecular formula based on the molar mass of serotonin.
Using the given mass percent values, we can calculate that the empirical formula of serotonin is C₁₁H₁₂N₂O . Since the molar mass of serotonin is 176 g/mol, this corresponds to a molecular formula of C₁₁H₁₂N₂O.
Therefore, the molecular formula of serotonin is C₁₁H₁₂N₂O.
How many electrons would be expected in the outermost electron shell of an atom with atomic number 12?
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Next, it is important to understand electron shells.
The first electron shell around an atom always has 2 valence electrons with the exception of Hydrogen because it only has one electron to begin with. It doesn't have enough electrons to fill it up with 2e-.
Every electron shell after the first shell fills up with electrons until it runs out of electrons or until it reaches 8 electrons. Once a shell fills up with 8 electrons a new shell is started. This pattern continues until all the atom's electrons are used up.
I drew a picture of this atom and its electron shells so that you can see what I mean. The answer is: The outermost shell will have 2 electrons on it. The electrons on the outermost shell are called valence electrons.
If you understand the material, often times you can use a shortcut for this problem. (atomic #)12 - (shell 1)2- (Shell 2)8= 2e- You keep subtracting 8 until your answer is less than or equal to 8.
Hope that made sense! Comment with any questions if things are still unclear or if you think I made a mistake. :)
Final answer:
A neutral magnesium (Mg) atom, with atomic number 12, has 2 electrons in its outermost shell.
Explanation:
The atom with atomic number 12 is magnesium (Mg), and according to its electronic configuration, it has 12 electrons.
In a neutral magnesium atom, the first shell (1s) is filled with 2 electrons, the second shell (2s and 2p) contains a total of 8 electrons, and the third and outermost shell has 2 electrons, as expressed in the electronic configuration of Mg (1s²2s²2p¶3s²).
Therefore, the number of electrons in the outermost electron shell of an atom with atomic number 12 would be 2.
Why do covalent compounds have significantly lower melting/boiling points than ionic compounds?
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What volume of a 0.303 m hydroiodic acid solution is required to neutralize 20.5 ml of a 0.167 m calcium hydroxide solution?
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2HCl + Ca(OH)₂ → CaCl₂ + H₂O
From this equation, we can see that two moles of HCl are required per mole of calcium hydroxide. Moreover, we know that moles, concentration and volume are related as:
Moles = molarity * liters
n = MV
2 * Moles of Ca(OH)₂ = Moles of HCl
2 * M₁ * V₁ = M₂ * V₂
2 * 0.167 * 0.0205 = 0.303 * V₂
V₂ = 0.02259 L
The volume required is 22.60 mL
Compounds which are characterized as covalent are generally made up of elements found in which part of the periodic table
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Alkalyne metals and alkalyne earth metals, which are located in the left part of the table, and given that those elements form ions with relative ease they make up ioinic compounds.
Covalent compounds are made up mainly of a non metal element and a metal elements with low metallic properties.
The metallic character of the elements decrease as you go to the right of the periodic table, that is why you found those elements in the right part of the periodic talbe.
Answer:
upper right of the periodic table
A reaction which forms a solid product is an example of a(n): gas evolution reaction. combustion reaction. precipitation reaction. oxidation-reduction reaction. none of the above
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The solid literally "precipitates" out of the liquid, meaning it comes out if the solution into a solid.
What happens to the light as the ocean increases in depth? Explain
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The ocean is much too deep for light to penetrate, thus it cannot reach the bottom of the water. Electromagnetic radiation that the human eye can detect as light.
What is light?Electromagnetic radiation that the human eye can detect as light. From radio waves with wavelengths measured in meters to gamma rays with wavelengths shorter than roughly 1 1011 meter, electromagnetic radiation occurs throughout a very broad range of wavelengths.
The wavelengths of light that are visible to humans fall into a relatively small range within that wide spectrum, ranging from about 700 nanometers for red light to roughly 400 nm for violet light. Infrared and ultraviolet are two spectral bands that are close to the visible band and are frequently referred to as light as well. The ocean is much too deep for light to penetrate, thus it cannot reach the bottom of the water.
Therefore, the ocean is much too deep for light to penetrate, thus it cannot reach the bottom of the water.
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The type of energy present in the bonds between atoms is
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What mass of sodium oxalate na2c2o4 is needed to prepare 0.250 l of a 0.100 m solution?
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Answer:
3.35 g Na2C2O4
Explanation:
They gave us the molarity and the liters of solution so using the relationship (M=mol/V) we can get the moles of solution.
0.250 L (0.100 mol/L) = 0.0250 mol Na2C2O4
Now that we have the moles of sodium oxalate, we can use its molar mass (134 g/mol) to convert to grams.
0.0250 mol (134.0 g/mol) -=3.35 grams (rounded to three sig figs
Approximately 3.35 grams of sodium oxalate (Na2C2O4) are needed to prepare 0.250 L of a 0.100 M solution.
The mass of sodium oxalate (Na2C2O4) needed to prepare a 0.100 M (mol/L) solution in a volume of 0.250 L, we can use the formula:
Mass = molar concentration × molar mass × volume
First, we need to calculate the number of moles of sodium oxalate required:
Number of moles = molar concentration × volume
Number of moles = 0.100 mol/L × 0.250 L
Number of moles = 0.025 mol
The molar mass of sodium oxalate (Na2C2O4) can be calculated as follows:
Molar mass = (2 × atomic mass of sodium) + (2 × atomic mass of carbon) + (4 × atomic mass of oxygen)
Molar mass = (2 × 22.99 g/mol) + (2 × 12.01 g/mol) + (4 × 16.00 g/mol)
Molar mass = 134.03 g/mol
Finally, we can calculate the mass of sodium oxalate needed:
Mass = number of moles × molar mass
Mass = 0.025 mol × 134.03 g/mol
Mass = 3.35 g
Therefore, approximately 3.35 grams of sodium oxalate (Na2C2O4) are needed to prepare 0.250 L of a 0.100 M solution.
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What is the chemical formula for an amino group?
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The amino group has the chemical formula -NH₂.
It consists of a nitrogen atom that is bonded to two hydrogen atoms, and to the carbon skeleton of a molecule. This functional group is a key component of amino acids, which are the building blocks of proteins.
For example, glycine is an amino acid where the amino group is bonded to an alpha carbon atom, along with a hydrogen atom, carboxyl group (-COOH), and a side chain represented by the R group.The general structure of an amino acid can be represented as R-CH(NH₂)-COOH. Different amino acids vary in their R group, which determines their unique properties. In biochemistry, the amino acids with an amino group and a carboxyl group attached to the same carbon atom are referred to as alpha-amino acids.
What determines whether or not a substance can be actively transported through the membrane?
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The compound Ba(NO3)2 includes _____ oxygen atoms.
6
3
5
2
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To determine the number of oxygen atoms in the given compound, barium nitrate Ba(NO3)2, we can see that in each mole of barium nitrate, there are 6 moles of oxygen atoms in it. In this problem, the correct answer is D.
6 moles of oxygen.
Explanation:
Ba(NO3)2 ,is a composite called 'barium nitrate.' It's also described as 'barium dinitrate.' Ba(NO3)2 is created up of atoms of barium (Ba), nitrogen (N) and oxygen (O). Barium nitrate is the inorganic compound with the chemical equation Ba(NO3)2. It, like most barium salts, is transparent, toxic, and water-soluble. It fires with a green flame and is an oxidizer, it is practiced in pyrotechnics.
in terms of spacing of particles what would be necessary to change from solid to gas what is the process called and how is it achieved
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To change from a solid to a gas, particles must gain sufficient energy to overcome intermolecular forces, a process known as sublimation when it occurs directly, or through melting and evaporation in two steps. This significantly increases the substance's volume. Sublimation and deposition are energy-involving phase transitions affected by temperature and pressure changes.
To change from a solid to a gas, particles need to gain enough energy to overcome their intermolecular interactions and disperse throughout the available space. This increase in energy allows the particles to move from a closely packed structure to one where they move about randomly and independently. This process is known as sublimation when a solid turns directly into a gas without passing through the liquid phase. However, typically a solid will first melt into a liquid and then the liquid will evaporate into a gas. This is achieved through the addition of energy, which can come from heat, for example.
The characteristic increase in volume that accompanies this transition is considerable. During the transition from liquid to gas especially, the volume of a substance can increase by a factor of 1,000 or more. Sublimation and the reverse process, deposition (where a gas becomes a solid directly), are facilitated by changes in temperature and pressure, and these phase transitions are both isothermal and involve a measurable change in energy.
At the molecular level, each state of matter—solid, liquid, gas—has different properties. Solids have particles in a fixed arrangement, while in liquids particles are still in contact but can move past one another. The gas phase is a state in which particles are separated by large distances relative to their size and move independently in a container, expanding to fill its shape and volume.