An ionic bond is formed when an element in Group 1A (alkali metals) bonds with an element from Group 7A (halogens) due to the large difference in their electronegativity values.
The resulting compound is held together by the electrostatic attraction between the oppositely charged ions. If an element from Group 1A (alkali metals) bonds with an element from Group 7A (halogens), an ionic bond is formed. Alkali metals have low electronegativity values and tend to lose an electron, while halogens have high electronegativity values and tend to gain an electron. In the process, the alkali metal becomes a positively charged ion (cation) and the halogen becomes a negatively charged ion (anion). The opposite charges of the ions attract each other and form an ionic bond. The resulting compound is held together by the electrostatic attraction between the oppositely charged ions.
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examples of mixtures
Examples of mixtures are: Air, Saltwater, Soil, Salad, and Blood
Air: Air is a mixture of gases, primarily nitrogen (78%) and oxygen (21%), as well as small amounts of other gases like carbon dioxide, argon, and neon.
Saltwater: Saltwater is a mixture of water and salt. The salt dissolves in the water, but the two substances remain physically separate.
Soil: Soil is a mixture of organic matter, minerals, and water.
Salad: A salad is a mixture of various vegetables and sometimes fruits, nuts, or meats. The ingredients are physically combined, but not chemically bonded.
Blood: Blood is a mixture of various cells and plasma, which contains water, proteins, and other nutrients.
These are just a few examples of the many mixtures that exist in nature and are used in our daily lives.
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--The given question is incomplete, the complete question is
"What are the examples of mixtures"--
mass is conserved in a reaction if the choose... of the initial reactant masses equals the choose... of the masses of choose...
According to the rule of conservation of mass, neither physical nor chemical processes may create or destroy mass inside an isolated system. A chemical reaction requires an equal mass balance between the reactants and products in accordance with the rule of conservation of mass.
How does chemistry define a reactant?A chemical reaction's reactants are the substances that take part in it. A chemical reaction is the term used to describe how atoms, which are the basic elements that make up matter, reorganize themselves to create new combinations. Raw materials are known as reactants when they interact.
What are a reactant and a product?On the left side of the equation, reactants are described as initial materials. The equation's right-hand side is where the products, which represent the outcome of the reaction, are listed.
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A scientist mixes 0.02 g of a strong monoprotic base in 83ml of water and obtains a pH of 12 . He then realizes that he forgot to label the container and forgot what base he added. What is the most likely the identity of thisr base? LiOH NaOH RbOH KOH
Here we have to first determine the value of pOH from the given value of pH and have to obtain the concentration of hydroxide ion. The base will be LiOH. The correct option is A.
What is pH?The pH of a solution is defined as the negative logarithm of hydronium ion concentration in moles per litre. Mathematically it is given as:
pH = -log [H₃O⁺]
We have the relation, pH + pOH = 14
Then pOH = 14 - pH = 14 - 12 = 2
[OH⁻] = -log [pOH]
= -log (2)
= 10⁻² M
= 0.01 M
The molar mass of base is:
[OH⁻] = Mass of the base × 1000 / Molar mass × volume
0.01 = 0.02 × 1000 / 0.01 × 83
= 24 mol / gm
Thus LiOH has the molar mass of 24 mol / gm.
Thus the correct option is A.
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Your question is incomplete, but most probably your full question was:
A scientist mixes 0.02 g of a strong monoprotic base in 83ml of water and obtains a pH of 12 . He then realizes that he forgot to label the container and forgot what base he added. What is the most likely the identity of thisr base?
A. LiOH
B. NaOH
C. RbOH
D. KOH
True or False? colligative properties depend only on solute concentration; the identity of the solute is not important.
Colligative qualities of solutions are traits that are dependent on the quantity of solute ions or molecules that are present, but not on the kind of solute. Vapor pressure reduction is one of its collaborating qualities.
The correct answer is true
Simply put, what do ions mean?A chemical species known as an ion is one that has a significant amount of either positive or negative charge. Atoms or molecules with non-zero net charges are referred to as "ions" in this context.
How do ions form?According to definition, a ion is just an electrostatically particle that is created by either taking electrons from a negative ion to generate a positive ion and adding electrons to the a neutral atom to produce a negative ion. The amount of protons remains constant as an ion forms.
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Which of the pairs of amino acids can form a salt bridge at physiological pH?aspartic acid and histidineglutamic acid and aspartic acidtwo cysteinesarginine and tyrosinelysine and glutamic acid
The pair of amino acids which can form a salt bridge at physiological pH is glutamic acid and aspartic acid.
What are amino acids?Amino acids are defined as the substances which are considered to be the monomers of proteins.Every amino acid has the same structure consisting of a central carbon which is bonded to an amino group , carboxyl group and a hydrogen.
Each amino acid also has another atom or a group of atoms bonded to the alpha carbon which are also known as the R group or the variable group of the side chain.There are 20 common amino acids present in natural proteins and each amino acid has the same backbone.
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what does spesific urine specific gravity range?
Urine density, or specific gravity, is a measurement of the solute content in the urine. Urine specific gravity typically falls within the range of 1.003 to 1.030. A specific gravity that is less than 1.003 may be abnormal and
The density of urine, which represents the solute content in the urine, is measured by urine specific gravity. Urine specific gravity typically falls within the range of 1.003 to 1.030. Less than 1.003 may be an indication of diabetes insipidus, chronic renal disease, or excessive hydration. On the other hand, a higher than average specific gravity (more than 1.030) might be a sign of renal illness, uncontrolled diabetes, or dehydration. Nevertheless, additional factors including hydration levels, medication use, and underlying medical disorders must be taken into account when interpreting urine specific gravity. Any abnormal urine test findings should be discussed with a healthcare professional for proper
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a scientist mixes 0.02 g of a strong base in 83 ml of water and obtains a ph of 12. he then realizes that he forgot to label the container and forgot what base he added. what is the most likely the identity of this base? a) LiOH. b) NaOH. c) RbOH. d) KOH
LiOH is the most likely identity of the base added. Option A is correct.
The pH of 12 indicates that the solution is strongly basic. To determine the identity of the base added, we can compare the amount of base added to the volume of water and use the pKa values of the conjugate acids to estimate which base is most likely to produce a pH of 12.
LiOH: 6.94 + 16.00 + 1.01 =23.95 g/mol
NaOH: 22.99 + 16.00 + 1.01 = 40.00 g/mol
RbOH: 85.47 + 16.00 + 1.01 = 102.48 g/mol
KOH: 39.10 + 16.00 + 1.01 = 56.11 g/mol
Amount of base added = 0.02 g / molar mass
LiOH: 0.02 g / 23.95 g/mol = 0.000835 mol
NaOH: 0.02 g / 40.00 g/mol = 0.0005 mol
RbOH: 0.02 g / 102.48 g/mol = 0.000195 mol
KOH: 0.02 g / 56.11 g/mol = 0.000356 mol
Next, we can calculate the concentration of hydroxide ions (OH-) in the solution using the pH:
pH = 14 - pOH
12 = 14 - pOH
pOH = 2
[OH⁻] =[tex]10^{-pOH}[/tex] = 0.01 M
Using the concentration of hydroxide ions and the amount of base added, we can calculate the concentration of the base in the solution:
[OH⁻] = [base]
0.01 M = [base] / (83 mL / 1000) L
[base] = 0.00083 mol/L
Finally, we can compare the concentration of the base to the amount of base added and estimate which base is most likely to produce a pH of 12. The pKa values of the conjugate acids of the bases are:
LiOH: pKa = 10.76
NaOH: pKa = 14.00
RbOH: pKa = 13.62
KOH: pKa = 13.25
From the calculations, we see that the concentration of the base in the solution is highest for LiOH, which has the lowest molar mass among the options. Additionally, the pKa value of LiOH is closest to the pH of 12 obtained, which suggests that LiOH is the most likely identity of the base added.
Hence, A. LiOH is the correct option.
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In the following acid-base reaction,
NH3 is the
H2PO4 (aq) + NH3(aq) → HPO42- (aq) + NH4+
Acid
Conjugate acid
Base
Answer:
Base
Explanation:
In an acid-base reaction, an acid donates a proton (H+) to a base, resulting in the formation of a conjugate base and a conjugate acid. In the reaction H2PO4- + NH3 → HPO42- + NH4+, H2PO4- donates a proton (H+) to NH3, making NH3 the base. The resulting NH4+ ion is the conjugate acid since it was formed by accepting the proton (H+) donated by H2PO4-. H2PO4- is acid, since it donated a proton to NH3, and HPO42- is the conjugate base, since it was formed when H2PO4- lost a proton.
what electron energy is required to obtain the diffraction pattern for a surface with crystal spacing of 4.0 å?
The incident electron beam must have enough energy to overcome the interatomic interactions holding the atoms in place in the crystal lattice in order to produce a diffraction pattern for a surface with crystal spacing of 4.0.
The Bragg equation specifies the minimal energy needed for an electron with a de Broglie wavelength of to diffract off a crystal lattice with spacing d: We can change the equation 2d sin(n) = n to: h/p = h/square (2meV)
we discover that 2d sin() = n h / sqrt (2meV)
When we solve for V, we obtain: V = h2 / (2me * 2)
The electron's mass, m, is equal to 9.11 x 10-31 kg, and its charge, e, is equal to 1.60 x 10-19 C. By substituting these values for the given crystal spacing, d = 4.0 = 4.0 x 10-10 m, and assuming that n = 1 (the first-order diffraction peak), and = 90° (the maximum diffraction), we obtain: = 2d /
Therefore,For a surface with a crystal spacing of 4.0, the minimal electron energy needed to produce the diffraction pattern is roughly 41.9 electron volts (eV).
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What is predicted to be the typical 1H-NMR chemical shift for methyl protons adjacent to an ether oxygen
The typical 1H-NMR chemical shift for methyl protons adjacent to ether oxygen is in the range of 3.3-3.7 ppm. This chemical shift range is consistent across a variety of different types of ethers, including cyclic ethers and alkyl ethers.
Due to the nearby ether oxygen's ability to remove electrons, this chemical shift range develops. The alkyl chain's carbon atoms are more electronegative than the oxygen atom, which has a deshielding impact on the methyl protons. The protons thus encounter a stronger magnetic field, which raises the chemical shift value.
It's important to keep in mind that the methyl protons' chemical shift can be influenced by the ether oxygen's chemical surroundings. The chemical shift, for instance, might alter slightly if the ether oxygen is a component of a larger functional group, like a carboxylic acid or an ester, because of the additional electrical effects of that group. However, typically, the 3.3–3.7 ppm chemical shift range is a good starting point for predicting the chemical shift of methyl protons adjacent to ether oxygen.
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True or False: colligative properties depend only on solute concentration; the identity of the solute is not important.
The colligative properties depend only on solute concentration; the identity of the solute is not important. It is true.
The colligative properties of a solution depend on the number of molecules or ions in the solute, not on the identity of solute. Osmotic pressure, boiling point elevation, freezing point depression, and vapor pressure depression are examples of ligand-like properties.
The total number of solute particles in a solution affects the colligative property of the solution. The chemical composition of the components has no effect on these properties. Therefore, the type of solvent has no effect on colligative power.
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Methanol is an alcohol used as a fuel for some race cars. The standard molar enthalpy of formation of methanol CH₂OH() is -238.4 kJ/mol. For the balanced reaction equation
of methanol use:
CH₂OH(I) +2O₂ --> CO₂ + 2H₂O.
Methanol is a liquid, but all the other chemicals in this reaction are gases. What is the enthalpy change of this reaction in kJ/mol?
Answer:
-488.2 kJ/mol
Explanation:
To calculate the enthalpy change of the reaction, we can use the standard molar enthalpies of the formation of the products and reactants, which are given in the problem.
ΔH = Σ(nΔHf° products) - Σ(nΔHf° reactants)
where ΔH is the enthalpy change of the reaction, n is the stoichiometric coefficient, and ΔHf° is the standard molar enthalpy of formation.
Substituting the values given in the problem, we get:
ΔH = [(1 mol)(-393.5 kJ/mol) + (2 mol)(-241.8 kJ/mol)] - [(1 mol)(-238.4 kJ/mol) + (2 mol)(0 kJ/mol)]
= -726.6 kJ/mol + 238.4 kJ/mol
= -488.2 kJ/mol
The negative sign indicates that the reaction is exothermic, which means that it releases heat. Therefore, the enthalpy change of the reaction is -488.2 kJ/mol.
What is a major difference between inorganic and organic compounds? A.There are many more inorganic compounds than organic compounds B.Organic compounds contain carbon; few inorganic compounds do. C.Organic compounds are never ionic. D.Organic compounds tend t0 be more polar than inorganic compounds.
The significant difference between inorganic and organic compounds is that an organic compound contains carbon; few inorganic compounds do. The correct answer is option(B).
Organic compounds are molecules made up of a combination of carbon, hydrogen, and oxygen atoms. Organic compounds are said to be more volatile and also highly combustible. These compounds are often associated with living organisms and are found in foods and medicines. These are insoluble in water.
Examples of organic compounds are carbohydrates, fats (lipids), proteins, and nucleic acids, which are the basis for the molecules of life.
Inorganic compounds are made up of atoms from different elements, such as metals, sulfur, or nitrogen, and are not associated with living things. These compounds are not flammable and are non-volatile in nature. These are soluble in water and also non-soluble in some of the organic solutions.
Examples of inorganic compounds include table salt (sodium chloride), bleach (sodium hypochlorite), and ammonia (NH3). The compound which despite having carbon are inorganic are graphite, carbon dioxide, carbon monoxide, carbides (e.g, Silicon Carbide), carbonates ( Calcium Carbonate), and some cyanides.
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What do
Electrons help form
And
Neutrons help keep
Now let's try one more example with biological relevance! here is a combustion reaction, which is also the process of photosynthesis. C6h12o6(s) 6 o2(g) -> 6 co2(g) 6 h2o(g) predict the sign of
The sign being referred to here is likely the ΔH sign, which indicates whether a reaction is exothermic (ΔH < 0) or endothermic (ΔH > 0).
In the case of the given combustion reaction, which is also the process of the photosynthesis in reverse, we can predict that it is an exothermic reaction because energy is released in the form of heat as well as light.
This can also be confirmed by the negative value of the enthalpy change (ΔH) associated with the reaction. Therefore, the sign of the ΔH for this reaction will be negative (ΔH < 0), indicating that it is exothermic.
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Which element has the electron configuration 1s22s22p63s23p64s^3ds? A) V B) Cr C) Mo D) Mn E) No element has this configuration
Answer:
A
Explanation:
is has the configuration because it does
The mass of a certain substance is 17. 5 kg. The density of the substance is 1. 71 g/ml. Determine the volume (in liters) of the substance
The volume of the substance is approximately 10.20468 liters.
Volume is the three-dimensional area that a material occupies or that is encircled by a surface. The cubic metre is the common unit of volume in the International System of Units (SI) (m3). The litre (L) is the volume unit used in the metric system.
First, we need to convert the mass to grams since the density is given in grams per milliliter:
17.5 kg = 17,500 g
Then, we can use the formula:
Density = mass / volume
to solve for the volume:
volume = mass / density
volume = [tex]17,500 g / 1.71 g/ml[/tex]
volume = 10,204.68 ml
Finally, we can convert milliliters to liters by dividing by 1000:
volume =[tex]10,204.68 ml / 1000 ml/liter[/tex]
volume = 10.20468 liters (rounded to 5 decimal places)
Therefore, the volume of the substance is approximately 10.20468 liters.
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nvm i don’t need helppp
Answer:
Ok It's all right.hahahhahah
At STP, which of these substances is most soluble in H2OH2O? Why?a) CCl4CCl4b) CO2CO2c) HClHCld) N2N2
HCl is the most soluble substance in water among the given options at STP.Among the given options, HCl (hydrogen chloride) is the most soluble in water at STP (standard temperature and pressure) due to its polar nature.
HCl is a polar molecule due to the unequal sharing of electrons between the hydrogen and chlorine atoms, resulting in a partial positive charge on hydrogen and a partial negative charge on chlorine. Water is also a polar molecule and thus, can interact with HCl through dipole-dipole interactions and hydrogen bonding, resulting in the dissolution of HCl in water.
On the other hand, CCl4 (carbon tetrachloride) is nonpolar and does not dissolve in water. CO2 (carbon dioxide) is also nonpolar and does not interact with water through hydrogen bonding or dipole-dipole interactions, resulting in low solubility. N2 (nitrogen) is also nonpolar and does not form any significant interactions with water, leading to low solubility in water.
Therefore, HCl is the most soluble substance in water among the given options at STP.
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what 1-bromobutane undergoes dehydrohalogenation by an elimination reaction when heated in the presence of base?
When 1-bromobutane undergoes dehydrohalogenation by an elimination reaction when heated in the presence of base, the organic product formed is 1- butene.
Dehydrohalogenation is defined as a reaction in which a hydrogen atom and a halogen atom are removed from adjacent atoms in a molecule forming an alkene or an alkyne. When this is reacted with strong base such as hydroxide ion, cyclohexyl chloride suffers dehydrohalogenation by a concerted E2 reaction mechanism. An elimination reaction is defined as a type of organic reaction in which two substituents are removed from a molecule in either a one or two step mechanism. The one step mechanism involved is known as the E2 reaction and the two-step mechanism is known as the E1 reaction. When 1-bromobutane undergoes dehydrohalogenation in the presence of a base it undergo elimination reaction.
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The correct question is,
1-bromobutane undergoes dehydrohalogenation by an elimination reaction when heated in the presence of base. what is the identity of the organic product?
In a _____two or more substances combine to form a new single substance.
a. Decomposition
b. Combination
c. Displacement
d. Double displacement
for an enzyme that follows michaelis-menton kinetics, km is equal to
For an enzyme that follows Michaelis-Menten kinetics, Km (the Michaelis constant) is equal to the substrate concentration at which the reaction rate is half of its maximum value.
Mathematically, Km is defined as the substrate concentration at which the initial reaction velocity is equal to one-half of the maximum reaction velocity (Vmax) of the enzyme.
In other words, Km is a measure of the affinity of the enzyme for its substrate. Enzymes with a lower Km have a higher affinity for their substrate, meaning that they can effectively bind and catalyze the reaction at lower substrate concentrations.
On the other hand, enzymes with a higher Km have a lower affinity for their substrate and require higher substrate concentrations to achieve the same reaction rate.
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What intermolecular forces are present in pure samples of both CH₃CH₂OH and CH₃CH₂NH₂?
A) Dispersion forces, dipole-dipole forces, and hydrogen bonding.
B) Dipole-dipole forces only.
C) Dipole-dipole forces and hydrogen bonding.
D) Dispersion forces and dipole-dipole forces
In pure samples of both CH3CH2OH and CH3CH2NH2, differences, dipole-dipole forces, or intermolecular hydrogen bonding forces all exist.
The correct answer is A
Why do you use the term "hydrogen bonding"?A hydrogen atom that is sandwiched between two other atoms and has a high affinity to electrons interacts with them to form a link that is stronger that
What guidelines apply to hydrogen bonds?For hydrogen bonds to form, two conditions must be met. Hydrogen Bonding Has to Meet Two Conditions: A electronegative atom is linked to hydrogen in the first molecule (N,O,F). On a tiny, very electronegative atom in the second molecule, there is a single pair of electrons.
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From the following items, which is closest in size to one mole of gas at stp?
At STP, a mole of pure gas is closest in size to a marble. As a tiny, solid material, a gram of gas at the STP is considerably smaller than a marble. D is the correct response.
At Standard Pressure and Temperature, 22.4 L of any gas will be required to hold 1 mole (STP). The Ideal Gas Law and a balanced chemical equation can be used to determine the amount or mass of gas consumed or created in a chemical process. In other words, the gas that has the greatest number of molecules of a certain gas at a given temperature will occupy the largest volume.
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Question: From the following items, which is closest in size to one mole of gas at STP?
A) A car
B) An elephant
C) A microwave
D) A marble
Examine the elements of noble gas and discuss TWO (2) properties of this type of element.
Any one of the 7 chemical elements that compose Group 18 (VIIIa) of a periodic table is referred to as a noble gas. The noble gases generally inflammable, tasteless, colorless, and odorless.
Explain about the noble gas and its properties?Due to their full valence shells (octets), which render them incredibly nonreactive, the noble gases (Group 18), which are found at the far right of a periodic table, were formerly known as the "inert gases."
Properties of the noble gas:
Noble gases are low chemically reactive, odorless, colourless, nonflammable, and monotonic gases.Noble gases are exceedingly stable and uncommon to form chemical connections since they have minimal inclination to receive or lose electrons, thanks to the complete valence electron shells of such atoms. There are exceptions to the rule that noble gases need not typically combine with other substances to form compounds.Xe can combine with fluoride or oxide to produce compounds.To know more about the noble gas, here
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when potassium chloride is exposed to a flame, the light given off is the result of
When potassium chloride is exposed to a flame, the light given off is the result of atomic emission.
When a compound is heated, the energy is absorbed by the atoms or ions in the compound, causing them to become excited and jump to higher energy levels. As the atoms or ions return to their original energy levels, they release the excess energy in the form of light. This phenomenon is known as atomic emission.
In the case of potassium chloride, the energy absorbed by the atoms causes them to emit light in the visible spectrum, which produces a characteristic violet color. This process is commonly used in flame tests to identify the presence of specific elements or ions in a sample.
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what is brass melting point?
Depending on the alloy's composition, brass has a melting point that ranges from 900°C to 940°C (1652°F to 1724°F).
According on the alloy's composition, brass's melting point might change. Copper, zinc, and occasionally other metals are combined to make the alloy known as brass, which has certain properties. Brass typically melts between 900°C and 940°C (1652°F and 1724°F), depending on the specific alloy. The precise melting point of a given brass alloy is, however, influenced by the ratios of copper and zinc in the alloy, as well as by any additional metals that might be present. Brass's melting point may be impacted by the inclusion of other metals. Brass's melting point, for instance, can be lowered when lead is added, while aluminium increases it when added.
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What is Osmosis, Diffusion, Tyndall effect and Brownian Motion???
Osmosis: Osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a cell's partially permeable membrane.
Diffusion: The process of movement of a substance (solid, liquid, or gas) from the region of higher concentration to the region of lower concentration so as to spread uniformly is called diffusion.
Tyndall effect: The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them.
or the scattering of a beam of light by a medium containing small suspended particles.
Brownian motion: Brownian motion refers to the random movement displayed by small particles that are suspended in fluids.
lithium one of the major chemical building blocks of modern life
True or False
The given statement is "lithium one of the major chemical building blocks of modern life" is false. Lithium is not the budling block of the modern life.
The Lithium is not one of the major chemical the budling block of the modern life. The building blocks of the modern life is the carbon , oxygen, and the nitrogen. There are the six main elements that are the fundamental unit of the building blocks of the life. The order of the buildings blocks of the modern life from the least common to the most common is as follows :
The sulfur, the phosphorous, the oxygen, the nitrogen, the carbon, and the hydrogen.
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Balance the chemical
equation
Mg(s)
0, (g)
MgO (s)
Identify type of reaction
The balanced chemical equation for the reaction between magnesium (Mg) and oxygen (O2) to form magnesium oxide (MgO) is:
2Mg (s) + O2 (g) → 2MgO (s)
In this equation, there are 2 atoms of magnesium and 2 molecules of oxygen on both sides of the equation, which means the equation is balanced.
This is an example of a synthesis reaction, where two or more substances combine to form a new compound. In this case, magnesium and oxygen react to form magnesium oxide. The reaction is exothermic, which means that it releases heat. This reaction is commonly used in the production of magnesium oxide, which is a useful material in various industrial applications, such as refractory linings in furnaces and kilns.
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Balance the chemical equation Mg (s) + O2 (g) → MgO (s) and identify type of reaction.
The balanced chemical equation for the formation of magnesium oxide (MgO) from the interaction of magnesium (Mg) and oxygen (O2) is 2Mg (s) + O2 (g) (s).
As there are two magnesium atoms and two oxygen molecules on either side of the equation in this case, the equation is balanced.
This is an illustration of a synthesis reaction, in which two or more chemicals come together to create a brand-new compound. As a result of this reaction, magnesium and oxygen produce magnesium oxide. Because the process is exothermic, heat is given off. Magnesium oxide is a result of this reaction that is frequently utilised in a variety of industrial applications, such as refractory linings for furnaces and kilns. Chemical symbols are used in chemical equations to represent what happens during a chemical reaction.
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Balance the chemical equation Mg (s) + O2 (g) → MgO (s) and identify type of reaction.