The product of a synthesis reaction between magnesium metal and nitrogen gas is magnesium nitride (Mg3N2).
In a synthesis reaction, two or more reactants are combined to form a new, more complex product. When magnesium metal reacts with nitrogen gas, the magnesium donates electrons to the nitrogen atoms, forming a strong covalent bond and resulting in the formation of magnesium nitride. The reaction can be represented by the following equation:
3Mg + N2 ⇒ Mg3N2
Magnesium nitride (Mg3N2) is a chemical compound made up of magnesium and nitrogen. It is a white solid that is used in a variety of industrial and scientific applications, such as in the production of high-strength, lightweight alloys for the aerospace and automotive industries, and as a catalyst in chemical reactions.
The synthesis of magnesium nitride from magnesium metal and nitrogen gas is a typical example of a synthesis reaction, where two or more simple substances are combined to form a more complex product. In this reaction, magnesium metal reacts with nitrogen gas to form magnesium nitride. The reaction is exothermic, releasing heat, and is usually performed at high temperatures (around 800-1000°C) in a sealed container under an inert atmosphere to prevent the formation of unwanted by-products.
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which of the follow compounds is bonded together by ionic bonds?
An ionic bond, sometimes known as just an electrovalent bond, is formed when two ions with opposite charges are electrically attracted to one another in a chemical molecule. This kind of link is made when the valence (outermost) electrons of one atom were permanently transported to another atom.
What, exactly, is indeed an ionic bond?A chemical molecule's ionic bond, often known as such an electrovalent bond, is produced by the electrostatic force between ions with different charges. This type of bond develops when the valence electrons, which are an atom's outermost electrons, are permanently transferred through one atom to another.
What makes for a good ionic bond?When two sodium atoms and one fluorine atom form an ionic bond, sodium fluoride, also know as NaF, is the result. As part of this process, the fluorine atom receives the single valence electron from the sodium atom with just enough room.
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In humans, the trace element iron is required for the proper functioning of hemoglobin, the molecule that carries oxygen in blood. What might the effects of an iron deficiency be?
Weakness. fair skin. Breathlessness, a rapid heartbeat, or soreness in the chest. Hemoglobin, a component of your blood's red blood cells, and myoglobin, a component of your muscles.
What does having low hemoglobin mean?Your anemia may decrease if an illness or condition impairs your body's capacity to make red blood cells. You will feel extremely exhausted and weak if your hemoglobin levels are low, which indicates that your liver isn't getting enough oxygen.
What does a high hemoglobin level mean?The most frequent reason of a higher hemoglobin count is when your body needs more hemoglobin to deliver oxygen, which typically happens when you smoke. The red blood cell formation normally rises when you dwell at a higher elevation to make up for the reduced oxygen availability there.
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The reaction of the iodocarbonyl with triphenylphosphine gives a neutral diamagnetic substitution product as well as an ionic diamagnetic substitution product. Which are A and B? Write two equations showing the formation of the neutral and ionic species from the iodocarbonyl
The products of this reaction are A - a neutral diamagnetic replacement product. B - an ionic diamagnetic replacement product.
The response of the iodocarbonyl with triphenylphosphine gives a neutral diamagnetic replacement product as well as an ionic diamagnetic replacement product.
The arrangement of the impartial and ionic species from the iodocarbonyl is as the situations:
A: Iodocarbonyl + Triphenylphosphine → neutral diamagnetic replacement product
The impartial diamagnetic replacement product can be addressed as:
C≡O + P(C6H5)3 → A
B: Iodocarbonyl + Triphenylphosphine → Ionic diamagnetic replacement product
The ionic diamagnetic replacement product can be addressed as:
C≡O + P(C6H5)3 → B+ + P(C6H5)3-
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Logan demonstrates to the class how mass must be conserved in every chemical reaction.
He measures the mass of hydrochloric acid and a magnesium strip separately. He then places the magnesium strip into the acid and bubbles form as the magnesium seems to
disappear. The combined mass afterward is less than the original.
Hydrochloric Acid + Magnesium
How could Logan explain this lower mass?
This is not a chemical reaction so the conservation laws do not apply.
The magnesium is destroyed and therefore the mass is less after the reaction.
The bubbles indicate that a gas is created and mass is lost as it escapes from the container.
The student must have not measured the mass correctly.
The bubbles indicate that a gas is created and mass is lost as it escapes from the container. Option 3.
Law of mass conservationAccording to the law of conservation of mass. the combined mass before the reaction must be equal to the combined mass after the reaction.
In the case of hydrochloric acid and magnesium, this is not the case. It is not so because when hydrochloric acid reacts with magnesium metal, hydrogen gas is liberated in the form of bubbles. These bubbles escaped into the atmosphere in the case of Logan.
Thus, the remaining mass must have escaped in the form of a gas.
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Anna has found containers at a crime scene that appear to be empty. What should she do with this evidence?
A.
She should cut a small piece of each container to take to the lab.
B.
She should set the containers on fire to see if they have gas inside.
C.
She should leave the empty containers at the scene.
D. She should seal and collect these empty containers.
She should seal and collect these empty containers (option D).
What should she do with this evidence?These items may obstruct the analysis and interpretation of the results. Collection: • Collect evidence in clean, unused airtight containers such as metal cans, glass jars, or heat-sealed fire debris bags (e.g., nylon or Kapak bags designed for fire debris) and seal.
Effective evidence preservation includes appropriate packaging, consistent labelling, and procedural documentation for all items. To reduce degradation, biological evidence should be air-dried before packaging.
Documentary evidence is any written information related to the fire or explosion incident. Documentary evidence is generally admissible if it is kept in the normal course of business.
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the answer to the calculation below with the correct number of significant figures is (4.16 x 10^3 + 2.58 x 10^2) / (5.377 x 10^4)
The answer to the calculation is 0.0775 with 3 significant figures.
define significant figures ?
Significant figures are the digits in a number that carry meaning contributing to its measurement precision. They are used to express the precision of a measurement or calculation result. Significant figures include all digits except for leading and trailing zeros, and zeros used to fill in the decimal portion of a number that is not an exact multiple of 1. In mathematical operations, the precision of the final result should be rounded to the least precise measurement or to the appropriate number of significant figures.
The answer to the calculation is 0.0775 with 3 significant figures.
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What is a renewable resource?
Answer:
also known as a flow resource, is a natural resource which will replenish to replace the portion depleted by usage and consumption, either through natural reproduction or other recurring processes in a finite amount of time in a human time scale.
Four Aluminum atoms combine with three chlorine molecules to produce solid
aluminum chloride. Balanced reaction is:
2A1 + 3Cl2 +2AlCl3
Use this particulate representations of the reaction to determine the limiting and
excess reactant.
КеY
O
DOD
Bo
Bo 8
= aluminum
1
chlorine
ロロロ
оо
Before reaction
After reaction
Limiting Aluminum and excess Chlorine
Limiting Chlorine and excess Aluminum
There is no excess reactant in this reaction.
Cannot be determined due to insufficient data
In this case, if we had more Cl2, then Al would be the limiting reactant, and if we had more Al, then Cl2 would be the limiting reactant.
The limiting reactant in a reaction is the reactant that is completely consumed before any of the other reactants run out, thereby limiting the amount of product that can be formed.
The excess reactant is the reactant that remains after the reaction has been completed, and is present in an amount greater than the stoichiometric ratio of the reaction.
In the reaction 2 Al + 3 Cl2 → 2 AlCl3, we can use the mole ratio of aluminum to chlorine to determine the limiting and excess reactant. If we assume that we have equal amounts of Al and Cl2, then we have 2 moles of Al and 3 moles of Cl2.
According to the reaction equation, for every 2 moles of Al, 3 moles of Cl2 are required. Since we only have 3 moles of Cl2, this means that Cl2 is the limiting reactant, as it will run out before Al. The amount of AlCl3 that can be produced is limited by the amount of Cl2, and so Al will become the excess reactant.
Therefore, if we had more Cl2, then Al would be the limiting reactant, and if we had more Al, then Cl2 would be the limiting reactant. The limiting reactant depends on the relative amounts of the reactants present in the reaction mixture.
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differentiate between homogeneous and heterogeneous mixtures with examples
Answer:
heterogenous- easily seen, easy to seperate, can see what makes it up-trail mix
homogenous- can't see all of the parts that make it up, difficult to separate
Explanation:
what trend in ionization energy do you see as you move across a period?
The trend that we see in the ionization energy across the period is an Ionization energy increases as we move across the period from left to right. Order of ionization energy across period 2
Li < B < Be < C < O < N < F < Ne
What is Ionization energy?
Ionization energy represents the energy required to remove an electron from an isolated gaseous atom (X) in its ground state.
It is minimum at the alkali metals and their low ionization enthalpies can be correlated with their high reactivity
The Ionization energy is maximum at the nobel gases since they have closed electron shells.
As you move across a period (left to right) in the periodic table, the ionization energy of the elements generally increases. This means that it takes more energy to remove an electron from an atom as you move from left to right in a period. This trend can be explained by the fact that the atomic radius decreases and the electron shielding remains constant as you move from left to right in a period, which results in a stronger attraction between the nucleus and the electrons and therefore requires more energy to remove an electron.
Trends for Ionization energy
There are two trends, the first ionization enthalpy generally increases as we go across a period from left to right and decreases as we go down in a group.
Two factors to understand these trends are
the attraction of electrons towards the nucleus and the repulsion of electrons from each other nucleus order of ionization energy across period 2Li < B < Be < C < O < N < F < Ne
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which of the type(s) of protons given are chemically non-equivalent?
Diastereotopic protons is the type(s) of protons given are chemically non-equivalent .
What is Diastereotopic protons ?
Diastereotopic protons are essentially different from one another chemically, and they all result in different chemical changes. Usually, this kind of proton belongs to a CH2 group and is found in chiral molecules, although it can also be found in the achiral compounds' more subtle chemical surroundings.
Which protons have the same chemical properties?
Homotopic protons exhibit identical NMR absorptions because their electronic properties are identical because they are chemically comparable.
Understanding NMR will rely heavily on the capacity to distinguish between chemical equivalency and nonequivalency among atoms in a molecule.
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What is the bond order of CO group?
a. 1
b. 2.5
c. 3.5
d. 3
e. None of the above/more than one of the above
3 is the bond order of CO group. Option d is correct alternative.
A bond order is a measure of the number of chemical bonds between two atoms in a molecule. In a molecule, the bond order is calculated by 1/2 *(numbers of electron in bonding - number of electron antibonding)
In the case of CO, the carbon atom forms a triple bond with the oxygen atom.
Considering, the molecular orbital electronic configuration of CO molecule,
here number of electron bonding is 10
number of electron antibonding is 4
so the bond order is = (10-4)*1/2= 3
So the bond order of CO molecule is 3.
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Which of the following generated osmotic pressure? sodium chloride, glucose and albumin generated osmotic pressure. sodium chloride glucose albumin
All three substances (sodium chloride, glucose, and albumin) can generate osmotic pressure.
Osmotic pressure is the pressure that arises from the difference in concentration of solutes between two solutions separated by a semi-permeable membrane. The semi-permeable membrane allows small solvent molecules, such as water, to pass through it but not larger solute molecules.
Sodium chloride, glucose, and albumin can all generate osmotic pressure because they are all solutes that are not able to pass through the semi-permeable membrane. As a result, a higher concentration of these substances on one side of the membrane compared to the other creates an imbalance in the concentration of solvent and solute, leading to the movement of solvent from the side with lower concentration to the side with higher concentration. This movement generates pressure, which is known as osmotic pressure.
In summary, the generation of osmotic pressure depends on the presence of solutes that are not able to pass through the semi-permeable membrane, and all three substances (sodium chloride, glucose, and albumin) fit this criteria.
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Which of the following alkanes would have the highest boiling point?- C5H12,- C6H14,- C7H16,- C8H18 .
An alkane's boiling point is proportional to its molecular weight, which is defined by the amount of carbon atoms it contains. The amount of carbon atoms in an alkane increases.
its molecular weight, and hence its boiling point. C8H18 contains the most carbon atoms and hence the greatest molecular weight of the possibilities presented. As a result,An alkane's boiling point is proportional to its molecular weight, which is defined by the amount of carbon atoms it contains. The amount of carbon atoms in an alkane increases. it has the highest boiling point among the alkanes listed. In general, larger molecular weight alkanes have a higher boiling point due to stronger intermolecular interactions (Van der Waals forces) between their molecules, which need more energy to overcome and hence result in a higher boiling point.
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In a dehydration synthesis reaction, __________ is always formed as a by-product of the reaction.
H+ and OH-
heat
ATP
water
None of the listed responses is correct.
Monomers make covalent bonds with one another to produce bigger molecules known as polymers. As a result, monomers emit water molecules as by products.
What is dehydration synthesis?Dehydration reactions are chemical processes in which a water molecule is removed from a reactant molecule. Dehydration synthesis refers to the act of combining two compounds while removing water molecules."
Because the term dehydration refers to 'losing water,' and synthesis refers to the development of a new material, dehydration synthesis is the elimination of water combined with the formation of new molecules. A combination of two molecules will undoubtedly generate a big complex, and water molecules will be eliminated and formed as a by-product of the process.
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How do you calculate atomic mass with percent abundance and isotopes?
To convert each percentage of abundance to a decimal, divide it by 100. Add the atomic mass of the isotope to this value. The atomic mass is obtained by averaging the atomic masses of each isotope.
Is the atomic mass calculated using percent abundance?To calculate the weighted average, we must take each isotope's % natural abundance into effect. The weighted mean of the atomic masses of an element's naturally occurring isotopes serves as the element's atomic mass.
What does an isotope's percentage abundance mean?The proportion of atoms with a particular atomic mass that can be found in a found naturally sample of an element is known as the relative abundance of an isotope.
How do isotopes work?Isotopes are atoms of the same element that have differing mass numbers but the same atomic number. Example: Protium (Z=1, A=1), Deuterium (Z=1, A=2), and Tritium (Z=1, A=3) are hydrogen isotopes.
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How many ml of 0. 050 m cacn2 are needed to make 25. 0 ml of 0. 010 m solution? the molar mass of cacn2 is 80. 11 g/mol.
To make 25.0 ml of 0.010 M solution of Ca(CN)2, we need 0.400 ml of 0.050 M Ca(CN)2 solution.
Given that the molarity of the desired solution (is 0.010 M), then we can calculate the no. of moles of Ca(CN)2 required to make 25.0 ml of solution:
n = M * V
= 0.010 M * 25.0 ml * (1 L/1000 ml)
= 2.5 x 10^-4 moles
Now, we should calculate the mass of Ca(CN)2 required, it its molar mass to use:
m = n * Mm
= 2.5 x 10^-4 moles * 80.11 g/mol
= 0.02 g
Finally, we can calculate the volume of a 0.050 M solution of Ca(CN)2 expected to get this mass:
V = m/(M * Mm)
= 0.02 g/(0.050 M * 80.11 g/mol)
= 0.02 g/0.050 mol
= 0.400 ml
In this way, to make 25.0 ml of 0.010 M solution of Ca(CN)2, we need 0.400 ml of 0.050 M Ca(CN)2 solution.
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which of the following involves a chemical change? group of answer choices melting ice cooking an egg none of these boiling water chopping wood
Out of all the given choices cooking an egg is a chemical change.
A chemical change, also known as a chemical reaction, is a process that transforms one or more substances into new and different substances with distinct chemical and physical properties.
This process is characterized by the rearrangement of atoms, the formation of new chemical bonds, and the release or absorption of energy.
Chemical changes can be initiated by various triggers such as heat, light, pressure, and the introduction of a catalyst. They are typically accompanied by distinct signs, such as the release of gas, the production of heat or light, the formation of a solid, and the change in color.
Some common examples of chemical changes include:
Combustion: The reaction of a fuel with oxygen, which releases heat and light energy in the form of fire.
Digestion: The chemical breakdown of food in the digestive system to release energy and nutrients.
Photosynthesis: The process by which plants convert light energy from the sun into chemical energy stored in the form of sugar.
Therefore, Out of all the given choices cooking an egg is a chemical change.
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If 17.5 grams of MgCl2 reacted how many grams of AlCl3 are produced?
3MgCl2 + 2Al → 3Mg + 2AlCl3
The mass (in grams) of AlCl₃ produced, given that 17.5 grams of MgCl₂ reacted is 16.4 grams
How do I determine the mass of AlCl₃ produced?The mass of AlCl₃ produced from the reaction of 17.5 grams of MgCl₂ can be obtained as illustrated below:
3MgCl₂ + 2Al -> 3Mg + 2AlCl₃
Molar mass of MgCl₂ = 95 g/molMass of MgCl₂ from the balanced equation = 3 × 95 = 285 g Molar mass of AlCl₃ = 133.5 g/molMass of AlCl₃ from the balanced equation = 2 × 133.5 = 267 gFrom the balanced equation above,
285 grams of MgCl₂ reacted to produce 267 grams AlCl₃
Therefore,
17.5 grams of MgCl₂ will react to produce = (17.5 × 267) / 285 = 16.4 grams of AlCl₃
Thus, the mass of AlCl₃ produced is 16.4 grams
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what is the density of nitrogen gas at stp
The density of nitrogen gas will be 1.25 g/L at S.T.P.
The density of a material shows the denseness of that material in specific given area. A material’s density is termed as its mass per unit volume. Density is essentially the measurement of how tightly matter will be packed together. It is a unique physical property of the particular object.
At STP, one mole of any gas occupies 22.4litres of volume. Nitrogen will exists in molecular form as N2.
So, the Density = Molecular mass / Volume
Molecular mass of one mole of N2 is 14(2) = 28 grams and Volume is 22.4 liters.
Density = 28 /22.4 g / L
= 1.25 g /L
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Where is the co peak in IR?
Highly polarized C-O single bonds exist. Their stretching vibrations produce a strong stretching peak that is typically observed between 1300 and 1000 because they have high values of d/dx.
Where can I find an IR carbonyl peak?
The range of peak positions for carbonyl stretching peaks, which make up a somewhat distinct region of the IR spectra, typically ranges from 1900 to 1600 cm-1.
As a result, the carbonyl stretching region is occasionally used to describe this region.
What is C-O single bonds ?
In chemistry, a single bond is a two-valence electron chemical link formed between two atoms. In other words, the location of the bond is where the atoms share a pair of electrons. A single bond is a particular kind of covalent bond as a result.
A coordinate bond is a covalent link (a shared pair of electrons) in which both electrons originate from the same atom. It is also known as a dative covalent bond.
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an atom has 16 neutrons and a mass number of 30. what is the atomic number, z, of this atom?
The atomic number is 14 protons.
What is an atomic number?
An atomic number is a number that represents the number of protons in the nucleus of an atom. It is also referred to as the proton number. The atomic number of an element is always the same, regardless of the mass of the atom. The mass number (symbolized as A) is the sum of the number of protons and the number of neutrons in the nucleus of an atom and also unique to each element. For example, the element Carbon has an atomic number of 6 and a mass number of 12. This means that Carbon atoms have 6 protons and 6 neutrons in their nucleus.
Since protons + neutrons = mass number
Mass - neutrons = protons.
So, plugging into the formula:
30−16= 14 protons.
Therefore, 14 protons is the answer.
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An atom has 16 neutrons and a mass number of 30. The atomic number, z, of this atom is
What is an atomic number?
An atomic number is a number that represents the number of protons in the nucleus of an atom. It is also referred to as the proton number. The atomic number of an element is always the same, regardless of the mass of the atom. The mass number (symbolized as A) is the sum of the number of protons and the number of neutrons in the nucleus of an atom and also unique to each element. For example, the element Carbon has an atomic number of 6 and a mass number of 12. This means that Carbon atoms have 6 protons and 6 neutrons in their nucleus.
Since protons + neutrons = mass number
Mass - neutrons = protons.
So, plugging into the formula:
30−16= 14 protons.
Therefore, 14 protons is the answer.
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Suppose that instead of letting the pipet drain naturally when delivering the stock solution used to prepare known solution #5 in part II of the procedure, you used the bulb to expel the last drop remaining in the pipet tip into the flask. a. Describe how the concentration of known solution #5 will be affected by this error. ** b. Describe how the absorbance measurement of known solution #5 will be affected by this error. ** c. Since the absorbance of known solution #5 is used to generate the Beer’s Law plot, state how will the slope of the best-fit line be affected by this error
When preparing a solution, it is important to accurately measure the volume of the stock solution being used. The method used to deliver the solution into the flask can impact the final concentration of the solution and therefore affect the absorbance measurement and the slope of the best-fit line generated from the absorbance measurements.
a. Impact on concentration of known solution #5:
When the last drop remaining in the pipet tip is expelled using the bulb, it may cause an overestimation of the volume of the stock solution being delivered into the flask. This leads to an increase in the total volume of the solution, thereby diluting the concentration of the solution. As a result, the concentration of known solution #5 will be lower than expected, leading to an error in the final solution concentration.
b. Impact on absorbance measurement of known solution #5:
Absorbance is a measure of how much light a solution absorbs and is proportional to the concentration of the absorbing species in the solution. Since the concentration of known solution #5 is affected by the error described above, the absorbance measurement of this solution will also be affected. If the solution is more dilute than expected, it will absorb less light, resulting in a lower absorbance measurement. This can impact the accuracy of the experimental results.
c. Impact on slope of best-fit line:
The Beer's Law plot is a graphical representation of the relationship between absorbance and concentration of a solution. The slope of the best-fit line generated from this plot represents the molar absorptivity of the absorbing species in the solution. If the error described above results in a lower absorbance measurement for known solution #5, this will impact the slope of the best-fit line. The slope will be lower, indicating that the molar absorptivity of the absorbing species is also lower than expected. This can impact the accuracy of the experimental results and make it difficult to interpret the data.
In conclusion, the error of expelling the last drop of the stock solution into the flask can have significant impacts on the final concentration of the solution, the absorbance measurement, and the slope of the best-fit line generated from the absorbance measurements. It is important to accurately measure the volume of the stock solution to avoid these errors and ensure the accuracy of the experimental results.
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When a pure substance undergoes a change from a solid state to a gaseous state, this is an example of a Select the correct answer below. physical change chemical change electrical change
none of the above
Option A. Physical change. When a substance changes from a solid to a gaseous state, it is an example of a physical change.
A physical change is a type of change that occurs when a substance undergoes a change in its physical properties, such as state, size, shape, or volume, without undergoing a chemical reaction. In other words, the chemical composition of the substance remains the same. When a pure substance changes from a solid state to a gaseous state, it is an example of a physical change. In this type of change, the substance is undergoing a phase transition from a solid to a gas without passing through a liquid phase, which is also known as sublimation. Physical changes are reversible and do not result in the formation of new substances. Examples of physical changes include melting, freezing, boiling, condensation, evaporation, and the change of state from solid to gas. Physical changes play a crucial role in many natural processes and are also important in many industrial and technological applications.
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Complete question:
When a pure substance undergoes a change from a solid state to a gaseous state, this is an example of a Select the correct answer below.
A) physical change
B) chemical change
C) electrical change
D) none of the above
How many valence electrons does boron have? A.2 B.3 C.3 D.3
Option 3 is the correct answer .
What is electron ?
Electrons are subatomic particles that have a negative electric charge. They are located outside the atomic nucleus in the electron cloud, and they play a crucial role in chemical reactions and electrical conductivity. The study of electrons and their behavior is called electromagnetism, and it is a fundamental field of physics.
Electrons occupy different energy levels, or shells, around the nucleus and can move between these shells through a process called electron excitation. This movement of electrons is what gives atoms their chemical properties and allows them to bond with other atoms to form molecules.
In a conductor, electrons are free to move and carry an electric current. In an insulator, electrons are tightly bound to their atoms and do not move freely, so they cannot carry an electric current.
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amino acids have similar structures. what part of an amino acid’s molecular formula distinguishes the macromolecule from other amino acids?
Amino acids have similar structures, the functional group linked to the central carbon atom makes one amino acid different from another (also known as the alpha carbon).
Each amino acid has a different functional group, also known as the R group, which gives it its own special characteristics. The R group, which might be a hydrogen atom, an alkyl group, a functional group with a charge, or a functional group with a polar or hydrophobic property, governs the physical and chemical properties of an amino acid.
The distinctive R group connected to the alpha carbon, together with the carbon, hydrogen, nitrogen, oxygen, and sulfur atoms that make up the backbone structure, are all included in the chemical formula of an amino acid. The distinctive R group that sets one amino acid from from another is also what helps peptide bonds, polypeptides, and proteins develop.
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determine the oxidation number of sulfur in each of the following substances? Part A barium sulfate, BaSO4 Express your answer as a signed integer.
Part B sulfurous acid, H2SO3 Express your answer as a signed integer.
Part C strontium sulfide, SrS Express your answer as a signed integer.
Part D hydrogen sulfide, H2S Express your answer as a signed integer.
A) Sulfur's oxidation number is BaSO4 Give a signed integer as your response.
What is the barium sulfate's sulfur oxidation number?+6 S is in the +6 oxidation state. The total charge of the ionic composition barium sulfate is neutral. Ba, S, and O must all have oxidation numbers of zero. Ba has an oxidation number of +2.
What is the sulfur oxidation number of every species?Knowing the sulfur oxidation numbers in each chemical species—S8 is zero, SO2 is positive 4, SO3 is positive 6, H2S is negative 2, and S2 is negative 2—allows us to determine the sum of six by adding the oxidation numbers.
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one way to analyze for the amount of phosphorus in a rock is to precipitate the phosphorus as mgnh4po4, which is then heated to tum it into mg2p2o7. what mass of mg2p2o7 will be obtained from a 2.087 g sample of a rock that contains 86.52% ca3(po4)2 (and no other source of phosphorus) if this analysis is done? hint: you will not be able to write an equation for this problem.
The mass of [tex]Mg_2P_2O_7[/tex] that will be obtained would be 0.22 grams
Stoichiometric problemThe equation of the reaction is as below:
[tex]2MgNH_4PO_4 -- > Mg_2P_2O_7 + 2NH_3 + H_2O[/tex]
The mole ratio of [tex]MgNH_4PO_4[/tex] and [tex]Mg_2P_2O_7[/tex] is 2:1.
2.087 g sample of [tex]MgNH_4PO_4[/tex] contains 86.52% Ca3(PO4)2.
The actual amount of [tex]MgNH_4PO_4[/tex] = 2.087 - (0.8652x2.087) = 0.2813 grams
Mole of 0.2813 grams [tex]MgNH_4PO_4[/tex] = 0.2813/137.315 = 0.002mol
Equivalent mole of [tex]Mg_2P_2O_7[/tex] produced = 0.002/2 = 0.001 mol
Mass of 0.001 mol [tex]Mg_2P_2O_7[/tex] = 0.001 x 222.55 = 0.22 grams
In other words, the mass of [tex]Mg_2P_2O_7[/tex] that will be obtained from a 2.087 g sample of a rock that contains 86.52% Ca3(PO4)2 would be 0.22 grams.
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What is the atomic number of oxygen? a. 9 b. 15 c.8 d.16
Oxygen has an atomic number of 8. The total amount of nucleons in the atom's nucleus determines its mass.
What makes oxygen 16?Six electrons are arranged the outer shells in the electron configurations of the elements in Lanthanide series of the periodic table. When two more electrons are added to an atom with such an electronic structure, it tends to create a stable ring of eight electrons, resulting in an ion with a double negative charge.
The valence shell is eight; why?In general, when an atom's outer electron shell is full, it is at its most stable and least reactive. The majority of biologically significant elements require eight electrons inside their outer shell to be stable.
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Susie places 3 beakers in the freezer. The first beaker contains water only, the second contains water and salt, and the third contains a water and sugar solution. Susie recorded the temperature and the time at which each mixture froze. Which is the most appropriate hypothesis for her experiment?.
The hypothesis for Susie's experiment could be that the freezing points of the water, salt, and sugar solution mixtures will be different from each other due to the presence of salt and sugar.
This hypothesis is supported by the observation that solutes, like salt and sugar, can lower a solvent's freezing point, like water.
The experiment will test how these solutes affect water's freezing point and will determine which mixture has the lowest freezing point. The results of the experiment could provide insight into the relationship between solutes and the freezing point of solutions.
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Anwer: B. The addition of salt raises the freezing point of water.
explanation:
This hypothesis directly addresses the effect of salt on the freezing point of water, which is the specific focus of her experiment. Susie can then test this hypothesis by comparing the freezing points of the water-only beaker and the water-and-salt beaker to see if the addition of salt indeed raises the freezing point of the water.