The density of a substance is its mass divided by volume. The density of the substance with a mass of 108.75 g and volume of 75 ml is 1.45 g/ml.
What is density ?The density of a substance is the measure of its mass per unit volume. Density describes how closely its particles are packed. The density of a substance depends on the bond type, molecular weight, temperature and pressure as well.
The floating property of a substance on a fluid depends on its density. If it has less density than the fluid it will float on it.
Given,
the mass of the object m = 108.75 g
volume = 75 ml
density = mass/ volume
d = 108.75 g /75 ml
= 1.45 g/ml.
Therefore, the density of the substance with the mass of 108.75 g and 75 ml volume is 1.45 g/ml.
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Pine trees, strawberry plants, and cacti are all plants. Name charateristics that you think scientists could use to seperate these members of the Plantae kingdom into smaller groups
The characteristics that separate Pine trees, strawberry plants, and cacti of the Plantae kingdom into smaller groups is Gymnosperm or angiosperms, seeds, location.
All plants belong to the kingdom Plantae. They are multicellular, eukaryotic, and autotrophic creatures. A stiff cell wall is present in each plant cell. Chloroplasts and the pigment chlorophyll are present in plants, which are necessary for photosynthesis.
Plant species can be distinguished by the following characteristics:
Angiosperms or gymnosperms: Strawberry plants are angiosperms, but pine trees are gymnosperms. Cactus is a gymnosperm as well.
Plants can be classified according on their habitat. Cactus, for example, is a desert plant, although pine and strawberries are not. They are either seed-producing or spore-producing plants; pines are spore-producing plants. Strawberry plants produce seeds.
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2 NaOH + H2SO4 → 2 H2O + Na2SO4
How many grams of NaOH are required to produce 16 g of H2O ?
7.3g of NaOH are required to produce 16 g of H2O
What are molecular weight ?
The entire mass of the atoms required to form a molecule per mole, expressed in grams, is what makes up the molar mass, also known as the molecular weight. Grams per mole are used to measure molecular mass. To determine molecular weight, count the atoms in each element and increase the result by the element's atomic weight.
Caustic soda or lye are two other names for sodium hydroxide. It is a typical ingredient in soaps and cleansers. Sodium hydroxide is a colorless, odorless solid at room temperature. Sodium hydroxide is a white, odorless liquid.
39 g of NaOH gives 18g of H2O
? g of NaOH gives 16g of H2O
i.e 18*16/39g
i.e. 7.3g of NaOH are required to produce 16 g of H2O
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Calculate the expected vapor pressure (in atm) for a solution prepared by dissolving 183. 0 g fructose in 500. 0 ml of water. Fructose is a nondissociating molecule, with a molar mass
The expected vapor pressure of the solution prepared by dissolving 183.0 g of fructose in 500.0 mL of water is approximately 0.0301 atm.
The mole fraction of water in the solution can be calculated as follows:
Moles of water = (volume of water in liters) x (density of water) / (molar mass of water)
Moles of water = (500.0 mL / 1000.0 mL/L) x (0.9982 g/mL) / (18.015 g/mol)
Moles of water = 27.722 mol
Moles of fructose = (mass of fructose) / (molar mass of fructose)
Moles of fructose = 183.0 g / 180.16 g/mol
Moles of fructose = 1.016 mol
The total moles of solute and solvent in the solution are:
Total moles = moles of water + moles of fructose
Total moles = 27.722 mol + 1.016 mol
Total moles = 28.738 mol
The mole fraction of water in the solution is:
Mole fraction of water = moles of water / total moles
Mole fraction of water = 27.722 mol / 28.738 mol
Mole fraction of water = 0.962
Using Raoult's Law, the expected vapor pressure of the solution can be calculated as:
Vapor pressure = mole fraction of water x vapor pressure of pure water
Vapor pressure = 0.962 x 0.0313 atm
Vapor pressure = 0.0301 atm
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A hockey player attempts to make a goal by sliding the puck across the frictionless ice.
What are the forces acting on the hockey puck as soon at it breaks contact with the stick?
Friction
Gravity
Normal
Contact (Push)
A hockey player attempts to make goal by sliding the puck across frictionless ice, forces acting on the hockey puck as soon at it breaks contact with the stick is gravity.
What is meant by frictionless surface?Frictionless surface is surface with no resistance between a surface or substance and something that is moving along or through it.
As soon as hockey puck breaks contact with the stick, only force acting on the puck is the force of gravity. As the ice is assumed to be frictionless, there is no frictional force acting on puck.
Normal force, which is the force exerted by ice on the puck perpendicular to surface of the ice, cancels out the force of gravity in vertical direction, but it does not affect the motion of puck in the horizontal direction. And finally, there is no contact force acting on puck as it is no longer in contact with the stick.
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(NEED HELP ASAP) Which statement is true about the particles of a solid when the solid changes into a liquid?
-They stop vibrating.
-Their kinetic energy increases.
-They move closer to each other.
-The attractive force between them increases.
When a solid changes into a liquid, the particles of the solid move farther apart and gain kinetic energy. Therefore, the statement that is true about the particles of a solid when the solid changes into a liquid is: their kinetic energy increases.
What is Kinetic Energy?
It is a scalar quantity and is dependent on the mass and velocity of an object. The formula for kinetic energy is:
Kinetic energy = (1/2) * mass * velocity^2
In a solid, the particles are tightly packed and vibrate in a fixed position. When the solid is heated or the pressure is reduced, the kinetic energy of the particles increases and they begin to vibrate faster and move slightly away from their fixed positions. This causes the solid to start melting and the particles begin to slide over each other, forming a liquid. Therefore, the particles of the solid move apart and gain kinetic energy when the solid changes into a liquid.
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Floods can drastically change the land in an area due to
Explanation:
Floods can drastically change the land in an area due to what is known as erosion. Erosion is the process of water carrying away small pieces of rock and soil. Over time, this can lead to large changes in the landscape. Floods can also deposit sediment, which can change the land in a different way. Deposition is the process of sediment being left behind by water. This can cause the land to become higher in some areas and lower in others.
Potassium chlorate (KClO3) will decompose to potassium chloride (KCl) and oxygen (O2) in the reaction shown:
2KClO3(s) → 2KCl(s) + 3O2(g)
A chemist allows 20.0 grams of KClO3 to decompose and captures 6.7 grams of O2 as a
result.
Answer:
Explanation:
Theoretical yield is 7.9 g O2
% yield is actual/theoreticalx 100 = 6.7/7.9 X 100= 84.81 % O2
In science, what is it called when you have a statement that can be mathematically modeled, based
on repeated experimental observations, that describes some phenomenon of nature?
In science, a statement that can be mathematically modeled based on repeated experimental observations, that describes some phenomenon of nature, is called a scientific law. A scientific law is a descriptive statement that summarizes a pattern observed in nature, typically expressed as a mathematical equation or formula, which describes the behavior of a particular natural phenomenon under certain conditions. Scientific laws are generally considered to be well-established and reliable, based on the repeated empirical evidence and testing that supports them.
Based on the color of the flame emitted by known compounds, what could be the metallic ion present in each of unknown solid
The color of the flame emitted by known compounds can be used to help identify the metallic ion present in an unknown solid. Different metallic ions produce different flame colors when they come into contact with a flame.
Metal ions in unknown substances can be identified through flame tests thanks to their distinctive emission spectra.
The metallic ion contained in an unknown material can be determined using the color of the flame produced by known compounds.
When in contact with a flame, different metal ions produce distinct flame colors: sodium creates a yellow flame, whereas potassium creates a violet flame.
The presence of a metallic ion can be determined by contrasting the flame colors of the known compounds with the flame of the unknown solid.
A spectroscope must be used to evaluate the flame in order to precisely identify the metal ions contained in an unidentified substance. This can lead to a more precise identification and a more thorough investigation of the emission spectra.
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how many moles are in 7.14x10 molecules of O2
Answer:
1.186x10^12
Explanation:
How many Hydrogen atoms in the formula 4H3O2
Answer:
Three atoms of Hydrogen.
Explanation:
There are four molecules of three Hydrogen atoms and two oxygen atoms.
Hope it helps.
For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. 2 NO₂(g) +F₂(g) → NO₂F(g) AH-284 kJ/mol,zn NO₂(g) and F₂ (g) can react to produce NO₂F(g), as represented above. A proposed mechanism for the reaction has two elementary steps, as shown below. Step 1: NO₂+ F₂ NO₂F + F (slow) Step 2: NO₂+F NO₂F (fast)
(a) Write a rate law for the overall reaction that is consistent with the proposed mechanism.
Rate law for the overall reaction that is consistent with the proposed mechanism is k [NO₂] [F₂].
What is rate law expression?
It is an expression that provides a relationship between the rate of the reaction and the concentrations of the reactants participating in it multiplying with rate constant. Rate in rate law expression is decided according to slow step.
Example-
If a reaction given as A + B → C rate constant = k
rate = k [A] [B]
Given,
Step 1: NO₂+ F₂ → NO₂F + F (slow)
Step 2: NO₂+F → NO₂F (fast)
rate = k [NO₂] [F₂]
Therefore, rate law for the overall reaction that is consistent with the proposed mechanism is k [NO₂] [F₂].
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How many moles of helium gas would be required to fill a 22 L container at a temperature of 35 oC and a pressure of 3.1 atm?
To solve this problem, we can use the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
We need to convert the temperature from Celsius to Kelvin by adding 273.15:
T = 35°C + 273.15 = 308.15 K
We also need to convert the volume from liters to cubic meters:
V = 22 L = 0.022 m³
Now we can solve for n:
n = PV / RT
n = (3.1 atm) (0.022 m³) / (0.08206 L·atm/mol·K) (308.15 K)
n = 0.00268 mol
Therefore, we would need 0.00268 moles of helium gas to fill a 22 L container at a temperature of 35°C and a pressure of 3.1 atm.
What is pressure?
It is typically measured in units of Pascals (Pa) or atmospheres (atm). Pressure can be calculated using the equation P = F/A, where P is pressure, F is the force being applied, and A is the area over which the force is being applied.In a gas, pressure is the result of the collisions of gas particles with the walls of the container. The more particles there are in a given volume, the higher the pressure will be. Additionally, increasing the temperature of a gas will increase the pressure if the volume and number of particles are held constant, due to the increased speed and force of the gas particles.To know more about pressure, click the link given below:
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what is the percent composition of salicylic acid?
The percent composition of salicylic acid is C7H6O3, or 60.87%C, 4.4%H, and 34.75%O
Please help! Ty
How many protons, neutrons,
and electrons are in this ion?
31 P3-
15
A. 15 p+, 16 nº, 18 e
B. 16 pt, 15 nº, 19 e
C. 15 pt, 16 nº, 15 e-
D. 15 pt, 16 nº, 12 e-
Explanation:
The symbol P represents the element phosphorus, which has an atomic number of 15, indicating that it has 15 protons in the nucleus. The ion is negatively charged with a 3- charge, which means it has three more electrons than protons.
To find the number of neutrons in an atom or ion, you need to know its mass number, which is the sum of protons and neutrons. Since the charge of the ion is not related to its mass, we can assume that the mass number is the same as that of the neutral phosphorus atom, which is approximately 31.
So, the number of protons, neutrons, and electrons in the P3- ion is:
Protons: 15
Neutrons: 31 - 15 = 16
Electrons: 15 + 3 = 18
Therefore, the P3- ion has 15 protons, 16 neutrons, and 18 electrons.
MgCl2 is electrolyzed to produce Mg and Cl2. 1311 g of MgCl2 decomposed, what is the percent yield for this reaction if 246.43 g of magnesium are recovered ?
PLEASE HELP
***write a balanced equation
The percent yield for this reaction is 147.2%.
What is a good percentage yield?
A good percentage yield depends on the specific reaction and the conditions under which it is performed. In general, a high percentage yield (e.g. 90% or higher) is desirable, as it indicates that the reaction is efficient and that little of the starting material was wasted. However, a 100% yield is often not possible in practice due to factors such as incomplete reactions, impurities in the reactants, and loss of product during isolation and purification.
The balanced equation for the electrolysis of MgCl2 is:
2 MgCl2(l) → 2 Mg(l) + Cl2(g)
To calculate the percent yield, we need to first find the theoretical yield of magnesium. This can be calculated using stoichiometry and the given amount of MgCl2:
Molar mass of MgCl2 = 95.211 g/mol
Moles of MgCl2 = 1311 g / 95.211 g/mol = 13.77 mol
From the balanced equation, 2 moles of Mg are produced for every 2 moles of MgCl2.
Therefore, moles of Mg produced = 13.77 mol / 2 = 6.885 mol
Theoretical yield of Mg = 6.885 mol x 24.305 g/mol = 167.38 g
Now we can calculate the percent yield using the actual yield of Mg:
Percent yield = (Actual yield / Theoretical yield) x 100%
Percent yield = (246.43 g / 167.38 g) x 100% = 147.2%
Therefore, the percent yield for this reaction is 147.2%.
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Identify the Name, Symbol, number of protons, neutrons, and electrons in a neutral atom of each of the following: (Please refer to a periodic table):
Answer:
Carbon
Name: Carbon
Symbol: C
Number of protons: 6
Number of neutrons: 6 or 7 (Carbon has two stable isotopes with 6 or 7 neutrons)
Number of electrons: 6
Sodium
Name: Sodium
Symbol: Na
Number of protons: 11
Number of neutrons: 12 or 13 (Sodium has one stable isotope with 12 neutrons, and another with 13 neutrons)
Number of electrons: 11
Helium
Name: Helium
Symbol: He
Number of protons: 2
Number of neutrons: 2
Number of electrons: 2
Chlorine
Name: Chlorine
Symbol: Cl
Number of protons: 17
Number of neutrons: 18 or 20 (Chlorine has two stable isotopes with 18 or 20 neutrons)
Number of electrons: 17
Gold
Name: Gold
Symbol: Au
Number of protons: 79
Number of neutrons: 118 (Gold has only one stable isotope with 118 neutrons)
Number of electrons: 79
What happens to the molecular attraction and kinetic energy when gas to changes to liquid?
Answer:
the molecules in a liquid don't move apart.
Explanation:
The molecules of a gas move apart when they collide. The average kinetic energy of the particles in a liquid (or solid) is small enough that the forces of attraction between them is sufficient to hold the particles close together. The molecules in a liquid (or solid) do not move apart.
Answer: When a gas changes to a liquid, the molecules in the gas lose some of their kinetic energy and their molecular attraction increases.
Explanation:
In a gas, the molecules are moving around rapidly and colliding with each other and with the walls of the container. These collisions create pressure, and the average kinetic energy of the molecules is high. However, when the gas cools down, the average kinetic energy of the molecules decreases, and they move around more slowly.
As the gas cools down further, the molecules start to come closer together, and the intermolecular attractive forces become more important. Eventually, the attractive forces between the molecules become strong enough to overcome the kinetic energy of the molecules, and the gas condenses into a liquid.
In a liquid, the molecules are still in motion, but they are much closer together and have much lower average kinetic energy than in a gas. The attractive forces between the molecules are strong enough to keep them close together in a fixed volume, but not so strong that they are unable to move around freely.
What mass og MgO is neded to produce 9. 38g of Na2O?
2NaCl+MgO=Na2O+MgCl2
The 6.10 g of MgO (Magnesium oxide) is needed to produce 9.38 g of Na2O(Sodium oxide).
To solve this problem, we need to use stoichiometry to relate the mass of Na2O produced to the mass of MgO used.
From the balanced chemical equation:
2 NaCl + MgO → Na2O + MgCl2
We can see that 1 mole of MgO produces 1 mole of Na2O. We can use the molar mass of Na2O to convert the given mass of Na2O to moles:
9.38 g Na2O x (1 mol Na2O / 61.98 g Na2O) = 0.1514 mol Na2O
Since 1 mole of MgO produces 1 mole of Na2O, we know that we need 0.1514 mol MgO to produce 0.1514 mol Na2O. Using the molar mass of MgO, we can convert this to mass:
0.1514 mol MgO x (40.31 g MgO / 1 mol MgO) = 6.10 g MgO
Therefore, 6.10 g of MgO is needed to produce 9.38 g of Na2O.
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Note: The question would be as
What mass of MgO is neded to produce 9. 38g of Na2O?
2NaCl+MgO=Na2O+MgCl2
Calculate the energy of a photon with wavelength of 4.50 × 103 nm.
4.42 × 10–20 J
1.42 × 10–28 J
2.30 × 1045 J
4.71 × 10–29 J
Answer: 4.71 × 10–29 J
Explanation:
Question
3. Calculate the energy of a photon with a wavelength of 4.50 x 103 nm. 1 point 4.71 x 10-29) 1.42 x 10-28) 4.42 x 10-20) 2.30 x 1045)
Explain how fossil fuels are formed from
living organisms on land and in sea.
Answer:
After millions of years underground, the compounds that make up plankton and plants turn into fossil fuels. Plankton decomposes into natural gas and oil, while plants become coal. Today, humans extract these resources through coal mining and the drilling of oil and gas wells on land and offshore.
Explanation:
Fossil fuels such as oil, coal and natural gas formed from living organisms on land and in sea are non-renewable resources created by the extinction of prehistoric plants and animals that are gradually being buried under rock layers.
Crude oil (also called crude oil or simply petroleum) is a fossil fuel formed from the remains of ancient marine organisms. After it died and sank to the bottom of the sea, the organic material mixed with other sediments and was buried.
Over the years, the rubble has been covered by layers of sand and silt. The heat and pressure of these layers helped turn the remains into what we now call oil or petroleum (fossil fuels).
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a. If 0.25 mol Na2CO3 completely reacts with excess HCl, how many moles of NaCl and CO2
will be produced, respectively?
b. If 6.02 x 1022 particles of NaBr completely react with excess Ca(OH)2, how many particles of NaOH will be produced?
c. If 204.45 g of NH3 is completed used up in the reaction, how many grams of (NH4)2SO4 will be produced?
d. If 1 mol C5H9O reacts with 2 mol O2, how many mol of CO2 will be produced?
If 0.25 mol Na₂CO₃ completely reacts with excess HCl, 0.5 moles of NaCl and 0.25 mole of CO₂ respectively.
If 6.02 x 10²² particles of NaBr completely react with excess Ca(OH)₂, 6.02 x 10²² particles of NaOH will be produced
If 204.45 g of NH₃ is completed used up in the reaction, 794.5g of (NH₄)₂SO₄ will be produced.
If 1 mol C₅H₉O reacts with 2 mol O₂, 5 moles of CO₂ will be produced.
What is mole concept?
Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Given,
a. 0.25 mol Na₂CO₃
Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂
1 mol Na₂CO₃ forms 2 moles of NaCl and 1 mole of CO₂.
0.25 mol Na₂CO₃ forms 0.5 moles of NaCl and 0.25 mole of CO₂.
b. 6.02 x 10²² particles of NaBr
2NaBr + Ca(OH)₂ → CaBr₂ + 2NaOH
2 moles of NaBr forms 2 moles of NaOH
Hence, 6.02 x 10²² particles of NaBr forms 6.02 x 10²² particles of NaOH.
c. Mass of NH3 = 204.45 g
2NH₃ + H₂SO₄ → (NH₄)₂SO₄
34g of NH₃ forms 132.14g of (NH₄)₂SO₄
204.45 g of NH₃ forms 794.5g of (NH₄)₂SO₄
d. 1 mol C₅H₉O
4C₅H₉O + 27O₂ → 20CO₂ + 18H₂O
4 mol C₅H₉O forms 20 moles CO₂
1 mole C₅H₉O forms 5 moles CO₂
Therefore, If 0.25 mol Na₂CO₃ completely reacts with excess HCl, 0.5 moles of NaCl and 0.25 mole of CO₂ respectively.
If 6.02 x 10²² particles of NaBr completely react with excess Ca(OH)₂, 6.02 x 10²² particles of NaOH will be produced
If 204.45 g of NH₃ is completed used up in the reaction, 794.5g of (NH₄)₂SO₄ will be produced.
If 1 mol C₅H₉O reacts with 2 mol O₂, 5 moles of CO₂ will be produced.
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How do covalent bonds differ from ionic bonds?
Answer: Covalent bonds share electrons between two or more atoms. Ionic bonds form when two or more ions come together with charge differences.
Explanation:
Ionic bonds: atoms TRANSFER electrons
Covalent: atoms SHARE electrons
When the same amount of force is applied to a smaller area, how is pressure affected?
Answer:
The pressure is reduced since the area needed to be exerted on by pressure has also been reduced
One mole is a quantity unit that is always equal to __________________________.
Answer:
6.022 × 10²³ units of that substance
Explanation:
Question 3 (1 point) The diagram on the below shows water molecules and ions from an NaCl crystal. What is the most likely reason that each water molecule is arranged so that the oxygen part of the molecule faces a sodium ion?
Answer:
There is attraction between oxygen atom and sodium ion due to their significant electonegative difference so therefore they face each other........
Pls answer number 4, my grade depends on it
Answer: where are the photographs
Explanation:
A liter of milk has a [H+] of about 2.51 × 10–7. (You may prefer to think of the hydronium ion concentration, [H3O+], as 2.51 × 10–7.) Use the formula for the calculation of pH provided and show each step as you calculate the pH of milk. In order to get full points you must show all the steps you take.
The pH of milk is approximately 6.6.
Steps
The formula for calculating pH is:
pH = -log[H+]
Given that [H+] of milk is about 2.51 × 10–7, we can substitute this value into the formula to calculate the pH:
pH = -log(2.51 × 10–7)
pH = -(-6.6)
pH = 6.6
Therefore, the pH of milk is approximately 6.6.
What is pH?A solution's acidity or basicity is determined by its pH. A pH of 7 indicates a neutral solution (equal concentration of H+ and OH- ions), a pH of less than 7 indicates an acidic solution (higher concentration of H+ ions), and a pH of greater than 7 indicates a basic or alkaline solution. It is defined as the negative logarithm of the hydrogen ion concentration [H+] in moles per liter (higher concentration of OH- ions).learn more about pH here
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wHAT HAPPENS IF THE CIRCUIT IS LEFT OPEN FOR A VERY LONG TIME
Answer:
please make me brainalist and keep smiling dude I hope helped you
please thank all of my answer
Explanation:
If the electric circuit is left open then there will be an incomplete path to drift the electron in that case no drift velocity of the electron is observed, hence there is no flow of current in the circuit.How is s,p,d,f blocks related to the type of element and its properties?
grouping elements into s, p, d, and f blocks allows us to predict the chemical and physical properties of elements based on their electron configurations and periodic table positions.
The periodic table's s, p, d, and f blocks refer to the arrangement of electrons in the atom's outermost energy level (valence shell), and they are related to the element's type and properties in several ways.
Atomic size increases from right to left within a period and from top to bottom within a group.
Ionization Energy: The energy required to remove an electron from an atom is referred to as ionisation energy.
Electronegativity: The ability of an atom to attract electrons towards itself in a chemical bond is measured by electronegativity.
Reactivity: An element's reactivity is determined by the number of valence electrons it possesses. Because the s-block elements have one or two valence electrons, they are extremely reactive.
Chemistry: Ionic compounds are formed by s-block elements with nonmetals, whereas covalent compounds are formed by p-block elements.
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