Answer:
Explanation:
Matter that always has exactly the same composition is classified as a pure substance. Every sample of a given substance has the same properties because a substance has a fixed, uniform composition.
HELP ME PLEASE!!
This is the first part, I’ll be posting the next 2, thank you for those helping!
Answer:
1.
protons neutrons electrons
1 1 1
6 6 6
26 30 26
79 118 79
Explanation:
protons and electrons are same
How many ATP molecules are released during formation of lactic acid by anaerobic respiration?A38B36C12D2
Answer:
The answer to your question is D. During anaerobic respiration, the formation of lactic acid results in the release of two ATP molecules. This is in contrast to aerobic respiration, which produces 38 ATP molecules.
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When a solution vaporizes, what is the sign of δg?
When a solution vaporizes, the sign of δg is zero.
What is Delta G at vaporization?The energy needed for vaporization offsets the raise in disorder of the system. So, δg = 0, and the liquid and vapor are in equilibrium, as is correct of any liquid at its boiling point under standard conditions.
The sign of δg shows the direction of a chemical reaction and determine if a reaction is spontaneous or not. δg = 0 means the system is at equilibrium and there is no net change both in forward and reverse direction.
δg is negative at temperatures greater than 373.15 K, and water evaporates spontaneously and irreversibly. And δg is positive at below 373.15 K, and water does not evaporate spontaneously.
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what is the value of delta s for the reaction? does this reaction proceed with an increase or decrease in entropy g
Entropy is represented by the symbol S, and a change in entropy is represented by "delta" S or ΔS. ΔS becomes positive when a system's entropy grows. ΔS becomes negative when a system's entropy diminishes.
When a process creates more molecules than it started with, entropy increases. When a process creates fewer molecules than it began with, entropy drops.
Negative delta S (S0) denotes a reduction in entropy with respect to the system. The entropy of the cosmos increases for physical processes, yet it reduces inside the bounds of the system being examined.
∆S denotes the entropy (disorder) transition from reactants to products. R is the gas constant (always positive) T is the absolute temperature (Kelvin, always positive) What it means: If H is negative, the reaction emits heat from the reactants to the products.
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What does the "FT" stand for in "FTIR"? Why is it common to find FTIR instruments, but not FTUV instruments? (I.e. why is a fourier transform only used in the long wavelength IR and microwave regions?)
How does a michelson interferometer work? What limits the resolution achievable in an FTIR spectrum? What applications is IR spectroscopy used for? What are the strengths of IR as compared to UV?
FTIR (Fourier Transform Infrared Spectroscopy) instruments use a Michelson interferometer to split a beam of infrared light into two beams that are then recombined to produce an interference pattern. The Fourier Transform is then applied to the interference pattern to produce a spectrum. The resolution can be improved by increasing the path difference between the two beams, but this also increases the size and complexity of the instrument.
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If two elements have the same number of protons but different number of neutrons, can they be atoms of the same elements?
If two elements have the same number of protons but different number of neutrons, can they be atoms of the same elements are called isotopes.
Atoms of the identical detail that incorporate the identical variety of protons, however special numbers of neutrons, are referred to as isotopes. Isotopes of any given detail all incorporate the identical variety of protons, in order that they have the identical atomic size (for example, the atomic variety of helium is usually 2). An isotope is one in every of or greater kinds of the identical chemical detail. Different isotopes of an detail have the identical size of protons withinside the nucleus, giving them the identical atomic size however a special variety of neutrons giving every elemental isotope a special atomic weight.
Thus, that species are known as isotopes.
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Which action would the nurse include when performing tracheostomy care?
Action would the nurse include when performing tracheostomy care Apply eye protection
A tracheostomy is a neck incision that opens up the windpipe (trachea). Another name for the opening is a stoma. If you have a lung or nerve issue, an infection, or difficulty with secretions, a tracheostomy can help you breathe. It's crucial to take appropriate care of a tracheostomy. It can help you maintain your breathing easy and prevent infections. Once your surgeon makes the incision in your windpipe, a catheter called a tracheostomy tube is implanted. It facilitates airflow into your lungs. Tracheostomy tubes come in a variety of styles. You can find the best one for you with the assistance of your healthcare provider.
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What kind of device in a circuit supplies voltage? What kind of device acts as a resistor?
Battery device in a circuit which supplies voltage. Battery is a electrical component which converts chemical energy into electrical energy using the process electrochemical oxidation-reduction reaction. Voltage is also called as potential difference which means the difference between two electropotentials of battery.
Resistor is a electronic component which offer resistance in the circuit. Resistor main purpose which opposes current flow in the circuit. Resistor are available in two categories linear resistors(metal oxide resistor ,potentiometer) and non linear resistors (photo resistor and thermistor)
The above two electronic components are played important keyrole in electronic circuit.
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consider the mixing of water with sodium and the melting of ice to water. Which process represents a chemical change and which represents a physical change? Explain your answer.
Answer:
Explanation:
The mixing of water and salt indicates a physical change since the chemical makeup of the components involved remains unchanged. Water and salt remain unchanged, and no new compounds are produced. The characteristics of water and sodium are not affected, and the two substances may be physically separated again.
The melting of ice to water, on the other hand, signifies a chemical change since the chemical makeup of the material changes. When ice melts, it goes from a solid state of water molecules to a liquid state of water molecules. The substance's qualities are altered and cannot be restored by basic physical means.
In short, a chemical change is one that results in the formation of a new substance, whereas a physical change does not result in the formation of new material. In this scenario, melting ice into water is a chemical change because it results in the formation of a new material (water), but combining water with sodium is a physical change since it does not result in the formation of a new substance.
The reaction of N−bromosuccinimide with 4−methyl−3−nitroanisole has been reported in the chemical literature. This reaction yields a single product in 95% yield. Identify the product formed from this starting material.
The product formed from the reaction of N-bromosuccinimide with 4-methyl-3-nitroanisole is 4-bromo-3-nitro-N-succinimidoanisole.
What is N-bromosuccinimide?
N-bromosuccinimide (NBS) is an organobromine compound used as a source of bromine in organic synthesis. It is a white solid that can be used for electrophilic substitution reactions, most notably for the bromination of alkenes. The reaction proceeds through the addition of a bromine radical to the double bond. The other product of the reaction is hydrobromic acid (HBr). NBS is also used for the bromination of aromatic compounds, and can be used in nitration, sulfonation, and halogenation reactions. NBS is a hazardous substance, and should be handled with care, as it can react with skin, eyes and other organs. It is also highly flammable, and must be stored away from heat and open flames.
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What is the approximate ph of a 0.10 m solution of a weak acid that has a ka of 5 x 10-5 m?
A) 2.7 PH = -Lay [At] B) 5.3 [ PH= Pkat Lug C) 4.8 О. Том D) 11.3 Pka = 4.30 Oka=-Lag Ka Pka= -Log
The approximate pH of a 0.10 M solution of a weak acid with a Ka of 5x10-5 M is 4.8.
To calculate the approximate pH of a weak acid solution, we can use the Henderson-Hasselbalch equation, which states that pH = pKa + log([A-]/[HA]).
In this equation, [A-] is the concentration of the conjugate base and [HA] is the concentration of the weak acid. In this case, [HA] is 0.10 M and [A-] is 5x10-5 M.
Calculate the molarity of the weak acid:
Molarity = 0.10 m (given)
Calculate the Ka of the weak acid:
Ka = 5 x 10-5 m (given)
Calculate the concentration of the conjugate base:
Conjugate base concentration = Ka x molarity = 5 x 10-5 m x 0.10 m = 5 x 10-6 m
Calculate the pH of the solution:
pH = -log[conjugate base] = -log(5 x 10-6) = 4.8
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Methane gas is compressed isothermally from 1. 00 atm to 1. 75 atm. The
initial volume is 20 L. Find the final volume of the gas?
After solving the problem the final volume of the gas is 35L.
What is final volume?The final volume is the amount of space occupied by an object, gas, or liquid in its finished state. It is the total volume of a substance, regardless of any changes that may have occurred to it during a process.
The final volume of the gas can be calculated using the ideal gas law. The ideal gas law states that:
PV = nRT
where P is pressure, V is volume, n is the amount of substance, R is the ideal gas constant and T is temperature.
Since this is an isothermal process, the temperature is constant and can be cancelled out. We can rearrange the equation to:
V2 = V1 (P2/P1)
where V2 is the final volume and V1 is the initial volume.
Substituting in the values, we get:V2 = 20L (1.75/1.00)
V2 = 35L
Therefore, the final volume of the gas is 35L.
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Which type of intermolecular force forms between hydrogen and very small, highly electronegative atoms like nitrogen, oxygen, and fluorine? "Which type of intermolecular force forms between hydrogen and very small, highly electronegative atoms like nitrogen, oxygen, and fluorine?
Dipole-dipole force
Intramolecular force
Dispersion force
Hydrogen bonding
Answer:
Hydrogen
Explanation:
Molecules that can only participate in hydrogen bonding are N, O, and F due to their electronegativity.
What intermolecular forces can HCI interact with other like molecules through?
Only dispersion and Dipole-dipole force are the intermolecular forces can HCI interact with other like molecules through.
What are the intermolecular forces?The attracting and repellent forces that develop between the molecules of a material are referred to as intermolecular forces (IMF), which is sometimes shortened. These forces operate as a mediator between a substance's individual molecules. The majority of matter's physical and chemical characteristics are caused by intermolecular forces.
Intermolecular forces, such as the electromagnetic forces of attraction or repulsion that act between atoms and other kinds of nearby particles, such as atoms or ions, mediate interactions between molecules.
Between molecules, intermolecular forces are at work. In contrast, molecules themselves exert intramolecular pressures. In comparison to intramolecular forces, intermolecular forces are weaker. The London dispersion force, dipole-dipole interaction, ion-dipole interaction, and van der Waals forces are a few examples of intermolecular forces.
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2. define the compression factor (z) and give its values for ideal and non-ideal gases over a moderate pressure range. (2 points)
Gas deviation factor or compressibility factor Z is the name given to the modifying factor for actual gases.
The ratio of the volume of a gas at a given temperature and pressure to the volume the gas would occupy if it were an ideal gas at that same temperature and pressure is what is meant by this term.
Therefore, the compressibility factor for an ideal gas is 1. The value of Z decreases with falling temperature and increases with rising pressure. The gas is referred regarded as ideal if Z = 1. It's claimed that the gas is not optimum.
The compressibility factor (Z), commonly referred to as the compression factor or the gas deviation factor in thermodynamics, measures how far a real gas deviates from the behavior of an ideal gas.
The molar volume ratio of a gas to an ideal gas at the same temperature and pressure is the simplest way to describe it.
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Which of the following molecules is least soluble in water?
The molecule which is least soluble in water is C(Cl)₄ since it is non polar.
Which molecules are soluble in water?When a molecule has more positive charges on one end than negative charges on the other, an electrical pole is created. This is how polar molecules are often generated.
We refer to something as being polar when it differs at either end. Some molecules also contain positive and negative ends; these are known as polar molecules. If not, we refer to them as non-polar. Polar objects may both attract and repel one another (opposite charges attract, alike charges repel).
Water is polar molecule and only polar molecules are soluble in water.
(CH₃)₂CO is a polar molecule as due to partial positive and negative charges on carbon and oxygen atom as a result of which it is soluble in water.
C(Cl)₄ is a non polar molecule as net dipole moment of the molecule is zero, so it is insoluble in water.
CH₃OH is also polar molecule and shows solubility in water.
(CH₃)₂O is also polar and dissolve in water.
Hence tetra chloro carbon is insoluble in water.
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scientific name for a base that dissolves in water
Answer:
water
Explanation:
At 25 °C, the density of water is 0. 997044 g/mL. Use this value to determine the percent error for the two density measurements. Calculate the percent error for density using graduated cylinder. Calculate the percent error for density using the burette readings
The percent error for density measurement obtained using a graduated cylinder is 0.05056% and the percent error for density measurement obtained using the burette is 0.10044%.
Percent error is a way to express the difference between a measured value and the true value as a percentage. The formula for percent error is: % error = (measured value - true value) / true value x 100%To calculate the percent error for density using a graduated cylinder, you would need to know the true density of water at 25 °C (which is given as 0.997044 g/mL) and the density measurement that you obtained using the graduated cylinder. Once you have these values, you can plug them into the formula above to calculate the percent error.To calculate the percent error for density using burette readings, you would need to follow the same process, but use the density measurement that you obtained using the burette instead of the graduated cylinder.Now, the percent error for density using the graduated cylinder:
% error = (0.9975 - 0.997044) / 0.997044 x 100% = 0.05056%
And, the percent error for density using the burette:
% error = (0.9980 - 0.997044) / 0.997044 x 100% = 0.10044%
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Fifteen percent of the pigment in paint color a is black. Sixty percent of the pigment in paint color b is black. An unknown amount of paint color b is mixed with 40 ml of paint color a, resulting in a paint that contains 25% black pigment.
Given, Fifteen percent of the pigment in paint colour A is black and Sixty percent of the pigment in paint colour B is black. And an unknown amount of paint colour B is mixed with 40 ml of paint colour A, resulting in a paint that contains 25% black pigment.
To find out the total amount of paint in the mixture
let total amount be = x
By following equation
0.15(40) + 0.6(x - 40) = 0.25(x).
For x = 6+0.6x - 24=0.25x
0.35x=18
By dividing both side by 0.35x
x=18/0.35
x=51.43
Therefore, the total amount of paint in the mixture
=0.15(40) + 0.6(x - 40)
= 0.25(x)
= 12.86( approx.)
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Complete question
Fifteen percent of the pigment in paint color A is black. Sixty percent of the pigment in paint color B is black. An unknown amount of paint color B is mixed with 40 ml of paint color A, resulting in a paint that contains 25% black pigment. Which equation can be used to solve for x, the total amount of paint in the mixture of the two colors?
I hat is a unique property of ether
Due to H-bonding and hydrophobic alkyl or aryl groups, ethers only have a limited amount of water solubility.
The correct ether attribute is which of the following?A net dipole moment is present in every ether molecule, according to its physical characteristics. The polarity of the C–O bond can be credited with this. As with alkanes, ether has a similar boiling point. But in comparison to alcohols with similar molecular masses, it is quite low.Ethers are liquids with an indistinct hue, a pleasant aroma, and a high volatility. Due to H-bonding and hydrophobic alkyl or aryl groups, ethers only have a limited amount of water solubility. Ethers do not possess hydrogen bonds inside themselves.Due to H-bonding and hydrophobic alkyl or aryl groups, ethers only have a limited amount of water solubility.To learn more about ethers refer to:
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How can you tell how many bonds are formed between atoms?
The number of bonds formed between atoms can be determined by examining the Lewis structure or the molecular geometry of a molecule.
In a Lewis structure, the number of bonds between atoms is represented by the number of lines connecting the atoms. Each line represents a covalent bond, which is a type of chemical bond formed by the sharing of electrons between atoms.
The molecular geometry refers to the arrangement of atoms in a molecule and can be determined by using techniques such as X-ray crystallography or quantum mechanical calculations. The molecular geometry provides information about the number of bonds and the angles between bonds in a molecule.
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What is the valence number of carbon in CH4?
The Valency number in carbon in CH4 is 4 where it shares four electrons with four Hydrogen atoms.
The Methane has its molecular formula CH4 . It is formed by one carbon atom and four hydrogen atoms. Hydrogen has its valency 1 and carbon being tetravalent needs four valence electrons to acquire noble gas configuration, where it shares its 4 electrons with four hydrogen atoms. The valency of carbon atoms in CH4 is 4. The or valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. Valency of carbon is always 4 because it needed 4 more electron to complete its octet. The Valency is always fix of every element.
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The mass of the ball is 0.0f kg the ball accelerates at 2,000 m/s2
A certain mass of a gas occupies 2 litres at 27°C and 100 Pa. ... is the force which when acts on a body of mass 1 kg, produces an acceleration of 1 m s-2.
What is mass?Mass, in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force. The greater the mass of a body, the smaller the change produced by an applied force. The unit of mass in the International System of Units (SI) is the kilogram, which is defined in terms of Planck’s constant, which is defined as equal to 6.62607015 × 10−34 joule second. One joule is equal to one kilogram times metre squared per second squared. With the second and the metre already defined in terms of other physical constants, the kilogram is determined by accurate measurements of Planck’s constant.To learn more about International System of Units (SI) refer to:
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what mass of table sugar (sucrose) stores 10,000 J of energy
One mole of sucrose stores 5878 KJ of energy. Then 10000J or 10 kJ is stored by 0.0017 moles or 0.58 g of sucrose.
What is sucrose ?Sucrose is a disaccharide formed from one glucose and one fructose units. Sucrose is used as the table sugar. Sucrose can store the chemical energy as well as it can release it through decomposition.
One mole of sucrose stores an energy of 5878.8 KJ.
molar mass of sucrose = 342. 3 g/mol
then, no.of moles of sucrose which stores 10 KJ energy = 10 /5878.8 = 0.0017 moles.
Mass of 0.0017 moles = no.of moles × molar mass
mass = 0.0017 × 342.3 g/mol = 0.58 g.
Therefore, 0.58 g of sucrose stores 10 J of energy.
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experiment 1: what can be said about the mass of the 1.0 m hcl and 1.0 m naoh solutions after they were combined?
The mass of the 1 M of the HCl and the 1 M NaOH solution after the combination of the both was the sum of their masses.
The hydrochloric acid react with the sodium hydroxide will form the sodium chloride and water. The reaction is given as :
HCl + NaOH ---> NaCl + H₂O
Mass of HCl = 36.4 g/mol
Mass of NaOH = 39.9 g /mol
Mass of NaCl = 58.4 g/mol
Mass of H₂O = 18 g/ mol
The mass of the reactant = The mass of the product
36.4 + 39.9 = 58.4 + 18
76.4 g = 76.4 g
Thus, the mass neither be created nor be destroyed.
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what is the shape of a valley formed by glacier?
Valley glaciers carve U-shaped valleys, as opposed to the V-shaped valleys carved by rivers.
What are the shape of a valley?They are all shaped like a "U" or "V." The majority of principal valley cuts are made by rivers and streams, creating sides with high walls and a narrow floor that from a distance resembles the letter "V." The steepness of the sides and the breadth of the floor are both influenced by the gradient of the river, or how rapidly it descends.In contrast to the V-shaped valleys formed by rivers, valley glaciers carve U-shaped valleys. When the temperature on Earth cools, glaciers develop and start to move downhill. They frequently choose the shortest route and settle in the small, V-shaped valleys that originally belonged to rivers.Learn more about valley glaciers refer to :
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is ability to neutralize a base a physical or chemical property
The ability to neutralize a base is a chemical property.
A chemical property is a characteristic of a substance that describes its ability to undergo a chemical change, such as the ability to neutralize an acid or base. Neutralization is a chemical reaction between an acid and a base, where the acid and base react to form a salt and water. This chemical reaction is a neutralization reaction and it neutralizes the acidity or basicity of the solutions.
A physical property, on the other hand, is a characteristic of a substance that can be observed or measured without changing the chemical composition of the substance. Examples of physical properties include color, density, melting point, and boiling point.
In summary, the ability to neutralize a base is a chemical property, because it involves a chemical change and the chemical reaction produces a new chemical compound.
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How many moles and atoms are there in 1gm of CaCO3?
0.01 moles and 6.022×10^21 atoms are there in 1gm of CaCO3.
What is the Full name of CaCO3?CaCO3 stands for Calcium Carbonate.Calcium carbonate, having the chemical formula CaCO3, is a substance. The primary component of eggshells, gastropod shells, shellfish skeletons, and pearls, it is a common substance found in rocks as the minerals calcite and aragonite.To find no. of moles in 1g of CaCO3 we need to know that;
Molecular mass of CaCO3=100
∴ no of moles = mass/molecular mass
=1g/100amu=0.01 mol
Hence, no of moles is equal to 0.01 mol
Now to find the no. of atoms we use the following;
No of atoms = no of moles× Avogadro number
⇒ 0.01×6.022×10²³
⇒6.022×10^21
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1- For an element, how does Avogadro’s number connect the atomic and macroscopic scales?
It describes the number of grams in 1 mole of an element.
It describes the number of atoms in 1 gram of an element.
It describes the number of atoms in 1 mole of an element.
It describes the number of moles in 1 gram of an element.
2- The atomic mass of the element platinum (Pt) is 195. 08 amu. How many atoms of platinum are in 195. 08 grams?
6. 022×1023 atoms
1. 175×1026 atoms
1. 951×1025 atoms
3. 087×1021 atoms
3- The atomic mass of copper (Cu) is 63. 546 amu, the atomic mass of sulfur (S) is 32. 065, and the atomic mass of oxygen (O) is 15. 999 amu. Which molar mass is correct for copper sulfate (CuSO4)?
159. 607 g/mol
225. 802 g/mol
111. 610 g/mol
446. 440 g/mol
For an element, Avogadro’s number connect the atomic and macroscopic scales by describing the number of grams in 1 mole of an element. Thus, option 1 is correct.
What is Avogadro’s number?The Avogadro's number reveals how many particles make up a mole (or mol) of a substance. These particles might be electrons, molecules, or atoms. Avogadro's number is roughly 6.022140857× 10² mol⁻¹.
Simply put, it links the quantity of substance to the number of particles, building a bridge between the macroscopic and microscopic worlds. It also explains how certain physical constants and characteristics relate to one another.
We always measure things in chemistry on a macroscopic scale. We gauge a substance's overall volume, temperature, mass, and other general attributes. However, if we examine this from an atomic perspective, it is crucial to understand particle momentum and velocity.
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Answer:
For #1:
It describes the number of atoms in 1 mole of an element.
For #2:
6.022×10^23 atoms
For #3:
159.607 g/mol
Why is it necessary to use prefixes in naming covalent compounds? Please use at least THREE complete content
related sentences. (I will give the brainliest to Whoever answers this correctly)
Prefixes are used to convey the important structural information of the compound and make the name informative and specific.
Prefixes are used in naming covalent compounds for several reasons:
To indicate the number of atoms of each element present in the compound. For example, the prefix "mono-" indicates one atom, "di-" indicates two atoms, "tri-" indicates three atoms, and so on.To indicate the arrangement of atoms in the compound. For example, the prefix "iso-" indicates that the atoms are arranged in the same way, while the prefix "meta-" indicates that the atoms are arranged in a different way.To indicate the position of atoms in the compound. For example, the prefix "ortho-" indicates that the atoms are in the same plane, while the prefix "meta-" indicates that the atoms are in different planes.To indicate the chemical properties of the compound. For example, the prefix "hydro-" indicates that the compound contains hydrogen, and "chloro-" indicates that the compound contains chlorine.To indicate the chemical reactivity of the compound. For example, the prefix "carbo-" indicates that the compound contains carbon, and "nitro-" indicates that the compound contains nitrogen.Learn more about covalent compounds here:
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