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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the diaxial conformation of cis-1,3-dimethylcyclohexane is 23 kj mole-1 les stable than the diequatorial conformation. why is this value larger than twice the steric strain of an axial methyl group? select a correct explanation.
The diaxial conformation of cis-1,3-dimethylcyclohexane is 23 kJ/mole less stable than the diequatorial conformation. This value is larger than twice the steric strain of an axial methyl group because the two methyl groups in the diaxial conformation have an additional gauche interaction.
This gauche interaction is a type of steric strain that occurs when two atoms or groups of atoms are too close to each other in space. In addition, the two methyl groups also have a 1,3-diaxial interaction with a common H group, which also contributes to the overall steric strain. The diequatorial conformation, on the other hand, has no gauche interactions and is thus more energetically favorable than the diaxial conformation.
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if 50.0 ml of distilled water is added to 50.0 ml of 0.035 m hf(aq), will the percent ionization of hf(aq) in the solution increase, decrease, or remain the same? justify your answer with an explanation or calculation.
The percent ionization of the acid would remain the same since water is just a molecular substance and the ionization depends only on the kind or strength of acid present.
What is the percent ionization of acid?The percent ionization of an acid is the measure of the extent to which an acid dissociates or ionizes into its ions in a solution.
It is expressed as the percentage of the initial concentration of the acid that has ionized. The percent ionization of an acid depends on the strength of the acid, the concentration of the solution, and the temperature.
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The simulation opens on the tab labeled Bar Magnet. It shows a magnetic compass and a bar magnet. Move the compass next to each end of the magnet. How do the poles of the compass needle interact with the bar magnet’s south (S) and north (N) poles?
The earth is a magnet and thus attracts the metallic needle of the compass b the magnetic needle of the compass aligns itself with the Earth's magnetic field C The Earth's south pole lacks.
Why does bar magnet always point in north direction?Because the earth behaves like a magnet, with its south pole in the geographical north and the north pole in the geographical south, a freely suspended magnet points north-south.
Because the compass needle's north seeking pole is always drawn to the north, the earth must be like a massive magnet with a magnetic pole at each end.
Thus, This is true, but magnetic north differs slightly from the earth's north axis of rotation.
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A sample of sodium has a mass of 60,0g. What is the mass of the same number of calcium atoms as sodium atoms present in given sample ?
The atomic mass of sodium is 22.99 g/mol, while the atomic mass of calcium is 40.08 g/mol. To determine the mass of an equivalent number of calcium atoms as sodium atoms, we would multiply the mass of the sodium sample by the ratio of the atomic masses of calcium to sodium:
Mass of calcium = Mass of sodium * (Atomic mass of calcium / Atomic mass of sodium)
Mass of calcium = 60.0 g * (40.08 g/mol / 22.99 g/mol)
Mass of calcium = 104.01 g
So the mass of an equivalent number of calcium atoms as sodium atoms present in the given sample would be approximately 104.01 g.
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What group on the amino acid give the molecule its characteristics and, when in polymers, the whole protein its shape and function?
There is an atom or an R-group in every amino acid. Each amino acid's R-group or sidechain confers unique properties on proteins, such as size, polarity, and pH.
What does an amino acid's R group represent?All amino acids have a side chain called an R-Group affixed to the -carbon. It determines the amino acid's chemical adaptability. As an illustration, some R-Groups have a charge, which results in a polar molecule. R-groups can either be hydrophilic or hydrophobic.
What qualities do amino acids have, and how are they put together?In addition to an amine group, a carboxylic acid group, and a side chain unique to each amino acid, amino acids are compounds. The four main components of an amino acid are carbon, hydrogen, oxygen, and nitrogen.
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you then mix 2.51 grams of Na2CO3 with 50.00 grams of 1.00m HCL. The two react to form aqueous NaCl water, and carbon dioxide. The initial temperature was 21.6o C and temperature at the end of the reaction was 25.3o C. Assume that the density of HCl is 1.00g/mL. Wite the balanced reaction
In the reaction between 2 moles of Na2CO3 and 6 moles of HCl, 2 moles of NaCl, 3 moles of water, and 2 moles of carbon dioxide are produced.
The balanced chemical equation is 2 Na2CO3 + 6 HCl 2 NaCl + 3 H2O + 2 CO2 for the reaction between sodium carbonate (Na2CO3) and hydrochloric acid (HCl).
In this reaction, 2 moles of Na2CO3 and 6 moles of HCl combine to produce 2 moles of NaCl, 3 moles of water, and 2 moles of carbon dioxide.
The burning of fossil fuels, the respiration of living things, as well as a number of other natural processes all result in the production of carbon dioxide (CO2), an odourless and colourless gas. Although it is a naturally occurring part of the Earth's atmosphere, excessive levels brought on by human activities like the burning of fossil fuels, deforestation.
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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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a competitive inhibitor of an enzyme-catalyzed reaction?
The competitive inhibition of a reaction can be overcome by adding more substrate to the reaction, which increases the chance that the substrate will bind at the active site of the enzyme therefore, option 4 is correct.
Because of this, the maximum velocity of the reaction (Vmax) remains the same, while the km value (the substrate concentration at which the velocity of the reaction is half of the maximum velocity) changes significantly.
A chemical is considered to be a competitive inhibitor if it is capable of binding to the active site of an enzyme with an affinity high enough to allow it to compete with the enzyme's natural substrate and, as a result, lower the enzyme's activity.
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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 functional group is not present in this molecule?
a. carboxyl
b. sulfhydryl
c. hydroxyl
d. amino
All the functional groups except ether are present.
Which functional group is not present in this molecule?functional group both carbon-carbon and carbon-hydrogen sigma bonds are single strong, nonpolar covalent bonds functional groups that are usually the least reactive bonds in organic molecules. Alkane order groups form the inert framework of most organic amalgams. For this reason, alkanes are not formally considered a functional group.
Functional groups are groups of atoms or bonds that define the purpose of the hydrocarbon that they get nuts about some of the important functional groups in biological molecules to involve: hydroxyl, methyl, carbonyl, carboxyl, amino, phosphate, and sulfhydryl groups
So we can conclude that Thus the ether functional group is away in the given structure.
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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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Knowing the chemical properties of a substance will tell you how the substance looks.
The given statement that "knowing the chemical properties of substances will tell you how the substance looks" is false becasue it tells you how these substances will react to other substances".
Chemical properties describe a substance's reactivity, flammability, stability, and other aspects related to its chemical behavior, but they do not describe its appearance. Physical properties, such as color, texture, shape, and size, are used to describe the appearance of a substance.
Therefore, knowing the chemical properties of a substance will not tell you how the substance looks.
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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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give the systematic name for the following formula: [co(nh3)4(no2)2]cl.
The systematic name for the formula [Co(NH3)4(NO2)2]Cl is tetraamminechloridodinitratocobalt(III).
The systematic name for the formula [Co(NH3)4(NO2)2]Cl is a way of describing the chemical compound using a standardized system based on the International Union of Pure and Applied Chemistry (IUPAC) rules. The systematic name consists of the metal ion, cobalt(III), followed by the ligands, which are the molecules or ions that are coordinated to the metal ion. In this case, the ligands are tetraamine (NH3), which forms the tetraammine part of the name, and dinitrato (NO2), which forms the dinitrat part of the name. Finally, the anion that is present in the compound, chloride (Cl), is listed. Hence, the systematic name of the compound is tetraamminechloridodinitratocobalt(III).
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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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Consider the following general equation for a chemical reaction. A(g) +B(g) → C(g) +D(9) AM° reaction=-10 kJ (a) Describe the two factors that determine whether an effective collision between molecules of A and B results in a reaction. (b) How would a decrease in temperature affect the rate of the reaction shown above? Explain your answer. (c) Write the rate law expression that would result if the reaction proceeded by the mechanism shown below A+B → [AB] (fast) [AB] + 8C+D (slow) (d) Explain why a catalyst increases the rate of a reaction but does not change the value of the equilibrium constant for that reaction.
(i) The colliding molecules should have energy equal to or greater than activation energy.
(ii) The colliding molecules should have proper orientation.
If the colliding reactant molecules have energy less than activation energy, then the collision will NOT be an effective collision
What is energy?
Scientists find energy as the ability to do work. Modern civilization is possible because humans have learned to change energy from one form to another and then use it to do work.To know more about energy, click the link given below:
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(a) The two factors that determine whether an effective collision between molecules of A and B results in a reaction are the energy of the collision and the orientation of the molecules in the collision.
What is collision?
Collision is an event in which two or more objects or particles come into contact with each other. Collisions occur in everyday life and are a fundamental part of physics. Collisions can be elastic or inelastic, depending on the energy of the objects involved.
(b) A decrease in temperature would decrease the rate of the reaction shown above because it would decrease the average kinetic energy of the molecules.
(c) The rate law expression that would result if the reaction proceeded by the mechanism shown below A+B → [AB] (fast) [AB] + 8C+D (slow) is: Rate = k[A][B].
(d) A catalyst increases the rate of a reaction by lowering the activation energy barrier, making it easier for the molecules to react. However, the catalyst does not change the value of the equilibrium constant for that reaction because it does not affect the thermodynamic properties of the reaction.
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1.2 mol Zn and 5.5 mol HCl react according
to the equation
Zn + 2HCl → ZnCl₂ + H₂.
If the limiting reactant is Zn, calculate the
amount of ZnCl₂ formed.
Answer in units of mol. Answer in units of
mol.
outs
porad
mol.
******
002 (part 2 of 2) 10.0 points
Calculate the amount of H2₂ formed.
Answer in units of mol.
If 1.2 mol Zn and 5.5 mol HCl combine, with Zn acting as the limiting reactant, 1.2 mol ZnCl2 and 1.2 mol H2 resulting from the reaction.
How do you determine a reaction's limiting rate?By dividing the volume of each solution by its molarity, you can get the number of moles of each reactant. By dividing the number of moles of each reactant by its stoichiometric coefficient in the balanced chemical equation, you may determine which reactant is the limiting one.
Reaction stoichiometry
The balanced reaction is:
Zn + 2 HCl → ZnCl₂ + H₂
Zn: 1 mole
HCl: 2 moles
ZnCl₂: 1 mole
H₂: 1 mole
moles of ZnCl₂= (1.2 moles of Zn× 1 mole of ZnCl₂)÷ 1 mole of Zn
moles of ZnCl₂= 1.2 moles
moles of H₂= (1.2 moles of Zn× 1 mole of H₂)÷ 1 mole of Zn
moles of H₂= 1.2 moles
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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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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.
How many different dichloroethene (C2H2F2) are there that differ in the location of their fluorine atoms?
There are two different dichloroethene (C2H2F2) molecules that differ in the location of their fluorine atoms.
The two isomers, known as cis and trans, have different molecular and physical properties due to their distinct molecular arrangements. In the cis isomer, both fluorine atoms are on the same side of the molecule, while in the trans isomer, the fluorine atoms are on opposite sides.
This difference in arrangement gives the two isomers different chemical and physical properties, such as boiling points, melting points, and reactivity towards other substances. These differences can impact their uses and applications, such as in refrigeration and as solvents.
Understanding the different isomers and their properties is important for making informed decisions in the production and use of chemicals, as well as for understanding their impact on the environment.
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Which choice gives the correctly
balanced equation for this reaction?
CuSO4 (aq) + NH₂OH(aq) →
Cu(OH)2 (s) + (NH4)2SO4 (aq)
A. CuSO4 + NH4OH → Cu(OH)2 + (NH4)2SO4
B. CuSO4 + 2NH₂OH → Cu(OH)2 + (NH4)₂SO4
C. 2CuSO4 + 4NH₂OH- 2Cu(OH)₂ + 2(NH4)2SO4
D. CuSO4 + (NH4)2(OH)2
Cu(OH)₂ + (NH4)₂SO4
Answer:
cuso4+(NH4)2(OH)2-cu(OH)+(NH4)2SO4
one liter of an aqueous solution contains 0.10 m lys at ph=10.8, and 0.1 m hcl is subsequently added. what is the ph after adding hcl?
The pH after adding HCl is 1.0.
To determine the pH after adding HCl, we need to consider the reaction that occurs between the lysine (base) and the HCl (acid):
lysine (base) + HCl (acid) -> lysine HCl (salt) + H+ (hydrogen ion)
This reaction results in the formation of lysine HCl (salt) and the release of hydrogen ions into the solution. The initial concentration of hydrogen ions in the solution was 10^(-10.8) = 3.16 x 10^(-11) M, and after adding HCl, the concentration of hydrogen ions increases to 0.1 M.
The new pH can be calculated as follows: pH = -log[H+] = -log(0.1) = 1.0
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Write the chemical symbols for three different atomic cations that all have 36 protons.
As in having the same number of electrons, Kr, Br, and Se2 are isoelectronic (36).
Write the chemical symbols ?Krypton has 36 protons since it has an atomic number of 36.It has the same number of protons (positive charges) as electrons since it is electrically neutral (negative charges). Kr possesses 36 electrons as a result.The atomic number of bromine is 35, which indicates that it contains 35 protons and 35 electrons.The anion Br, which contains 35 + 1 = 36 electrons, is created when it gains 1 electron.The atomic number of selenium is 34, which indicates that it contains 34 protons and 34 electrons.It produces the anion Se2, which has 34 + 2 = 36 electrons, when it obtains 2 electrons.As in having the same number of electrons, Kr, Br, and Se2 are isoelectronic (36).To learn more about chemical symbols refer
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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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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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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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when atoms of an element gain or lose neutrons, this changes the weight of the atom without affecting its chemical properties. except, atoms that gain or lose neutrons may become unstable and begin to breakup and become radioactive. what do we call atoms that differ only in their neutron count?
Answer: you call them isotopes
Explanation:
which compound contains a nitrogen atom with trigonal pyramidal geometry
Ammonia: it is a compound with the formula of NH3. It has a trigonal pyramid shape.
What is ammonia?
Ammonia is a colorless highly irritating gas with a pungent, suffocating odor. It dissolves easily in water to form an ammonium hydroxide solution, which can cause irritation and caustics. Ammonia is a gas that is easily compressed and forms a clear, colorless liquid under pressure.To know more about ammonia, click the link given below:
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Ammonia (NH3) is an example of a compound containing a nitrogen atom with trigonal pyramidal geometry.
What is pyramidal geometry?
Pyramidal geometry is a type of geometry that is based on the shape of a pyramid. It is mainly used to describe the structure of molecules and crystal lattices, as well as the shape of polyhedral and other three-dimensional objects. It is a type of non-Euclidean geometry, which means that the angles and shapes of the objects described in it may not follow the same rules as Euclidean geometry. In this type of geometry, objects can have an infinite number of faces and an infinite number of edges. Pyramidal geometry can also be used to describe the behavior of light and other waves, as well as the behavior of particles in a vacuum.
The nitrogen atom is the central atom, and it is surrounded by three hydrogen atoms and one lone pair of electrons. This arrangement gives the nitrogen atom a trigonal pyramidal shape.
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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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At elevated temperatures, solid sodium chlorate decomposes to sodium chloride and oxygen gas. A 0.8765-g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. The oxygen was collected over water and occupied 57.2 mL at 22 degrees Celsius and a pressure of 734 torr. At 22 degrees Celsius, the pressure of water vapor is 19.8 torr.
a. Calculate the mass of oxygen formed in this decomposition reaction.
b. Calculate the mass percent of sodium chlorate in the sample.
Because oxygen gas has a molar mass of 32 g/mol, the mass of oxygen generated is 0.0753 g. The sample contains 91.36% sodium chlorate by mass.
What is reaction?A chemical reaction is a process that converts one or more compounds, known as reactants, to one or more distinct substances, known as products. Chemical elements or compounds are examples of substances.
Here,
a. To calculate the mass of oxygen formed in the reaction, the volume of oxygen gas collected must be converted to its equivalent moles. The molar volume of an ideal gas at 22 degrees Celsius and a pressure of 734 torr is 24.45 L/mol. Therefore, the number of moles of oxygen gas produced is:
n = (57.2 mL) / (24.45 L/mol) = 2.349 x 10^-4 mol
The molar mass of oxygen gas is 32 g/mol, so the mass of oxygen produced is:
m = n * M = 2.349 x 10^-4 mol * 32 g/mol = 0.0753 g
b. To calculate the mass percent of sodium chlorate in the sample, divide the mass of sodium chlorate by the total mass of the sample and multiply by 100%. The mass of sodium chlorate in the sample is:
m_NaClO3 = 0.8765 g - 0.0753 g = 0.8012 g
So, the mass percent of sodium chlorate in the sample is:
mass percent = (m_NaClO3 / 0.8765 g) * 100% = 91.36%
The molar mass of oxygen gas is 32 g/mol, so the mass of oxygen produced is 0.0753 g. The mass percent of sodium chlorate in the sample is 91.36%.
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