The statements correctly describe the relationship between the number of particles in a sample and its mass are:
Two different samples of c-12 atoms that have the same mass must contain the same number of atoms.Two samples may contain the same number of atoms but have different masses.The number of ne atoms in a sample can be determined from the mass of the sample.What is the mass about?The statement "Two different samples of C-12 atoms that have the same mass must contain the same number of atoms." is true because the atomic mass of a carbon-12 atom is a constant and its mass does not change. This means that if two samples of carbon-12 atoms have the same mass, then they must contain the same number of atoms.
Note: The mass of a sample is proportional to the number of atoms it contains, but the relationship between mass and number of particles is not one-to-one. The atomic masses of different elements differ, which means that different elements will have different numbers of atoms for the same mass.
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I have three mole of Methane (CH4) on the reactant ide of the reaction. Do I have enough information to determine how many mole of product I will have following a reaction? If not, what ele do I need to know?
In order to determine the number of moles of product that will be produced following a reaction, you need to know the stoichiometric ratio of the reactants to the products.
In other words, you need to know the balanced chemical equation of the reaction, which specifies how many moles of each reactant are required to produce a certain number of moles of product.
Without this information, it is not possible to determine the number of moles of product that will be produced from the given number of moles of methane.
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a process in which a covalent or ionic bond is broken or formed is generally called a ______ reaction.
A process in which a covalent or the ionic bond is broken or it formed is generally called a chemical reaction.
A chemical reaction is a process in which the bond break and the formation of the bond take place. In a chemical reaction two more more species called as the reactant will react and form the new substance called as the product. The chemical is the process in the chemical transformation takes place. The examples of the chemical reaction is as follows :
CH₄ + 2O₂ -----> CO₂ + 2H₂O
Thus, in a chemical reaction the covalent bond and the ionic bond broke or it formed.
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. elemental iodine is a solid at room temperature. what is the major attractive force that exists among different i2 molecules in the solid state?
Generally, Iodine exists as a diatomic molecule, I₂, which is formed when two iodine atoms form a covalent bond. It is true that, iodine at room temperature exists as a solid because the strength of these forces are in line with iodine's large electron cloud and polarizability.
An important reason of this fact is that the bonding electrons are being shared equally, which is implied by the covalent bonding that exists between the atoms, is the fact that the iodine molecule is nonpolar.
Due to this, the only intermolecular forces of attraction that forms the bond between iodine molecules are relatively weak London dispersion forces.
The interesting thing is that London dispersion forces strength increases with the size of the molecule or, with the size of the molecule's electron cloud.
The more larger molecules, they have larger electron clouds, something that has a direct impact on the strength of the London dispersion forces.
Therefore, the presence of larger electron cloud indicates that these partial charges are more significant. Hence, the larger the electron cloud can be easily polarized.
So, as a conclusion, it can be observed that the only forces that exist between iodine molecules are relatively weak London dispersion forces.
Hence, it is true that iodine exists as a solid at room temperature because the strength of these forces are in line with iodine's large electron cloud and polarizability.
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Which radiation unit is determined by the quality factor (QF)? a. roentgen b. rad c. rem d. gray e. coulombs per kilogram.
The roentgen equivalent man or rem is the radiation unit which is determined by the quality factor QF.
Hence, the correct option is option c. rem
The roentgen equivalent man or rem is basically a CGS unit of equivalent dose, effective dose, as well as committed dose, which are basically the dose measures which are used to estimate potential health effects of the low levels of ionizing radiations on the human body.
Quantities measured in rem are designed such that they represent the stochastic biological risk of ionizing radiation, which is mainly the radiation-induced cancer. These quantities are derived from the absorbed dose, which has the unit rad. rem is determined by the QF or the quality factor.
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Which of the following is a result of
differentiation?
a. An organism grows larger.
b. Cells in an embryo increase in number.
c. Cells in an embryo become different from
one another.
d. An organism reproduces.
The result of the cell differentiation is that cells in an embryo become different from one another. Option C
What is cell differentiation?When we are talking about cell differentiation we mean the process by which the cells of the organisms would become different from each other. That is is the manner in which the cell would become to carry out the functions that are different from each other.
We should note that the embryo is just formed as a mass of cells that must be able to differentiate so that each of the cells can be able to perform an assigned task.
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three non-metallic elements x, y, and z have electronegativities of 2.8, 3.9, and 1.5 respectively and form compounds xy, yz, an xz. what type of bonding do you expect in each of the three compounds?
Three non-metallic elements x, y, and z have electronegativities of 2.8, 3.9, and 1.5 respectively and form compounds xy, yz, an xz. type of bonding expect in each of the three compounds For each compound:
xy: Based on the difference in electronegativities between x and y (2.8 and 3.9, respectively), there is a large difference in electronegativity, indicating that y will have a stronger pull on the electrons in the bond, and thus a polar covalent bond is expected.yz: With electronegativities of 3.9 and 1.5 for y and z, respectively, there is a significant difference in electronegativity, suggesting that y will have a stronger pull on electrons in the bond and leading to an ionic bond.xz: With electronegativities of 2.8 and 1.5 for x and z, respectively, the difference in electronegativity is not significant, indicating that the bond between x and z is likely to be covalent and non-polar.
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1. "Syngas" is used to produce methanol via the following reaction: CO + 2 H2 → CH3OH a) Write the rate expression, in terms of the change in concentration, for each species in the reaction. b) How fast does the concentration of the CH3OH increase if the hydrogen is consumed at 3.0 x 10-5 mol/(L*sec)?
The rate expression is typically written in terms of the change in concentration (d[A]/dt) of a reactant or product (A) over time (t).
The general form of a rate expression is:
d[A]/dt = -k[A]^n (k is rate constant, n is stoichiometric coefficient).
If the hydrogen is consumed at 3.0 x 10-5 mol/(L*sec) then increase in the concentration of methanol (CH3OH) will also be:
d[CH3OH]/dt = 3.0 x 10-5 mol/(L * sec).
a) The rate expression for the Syngas reaction CO + 2 H2 → CH3OH (methanol) can be written as:
rate of reaction for CO: -d[CO]/dt
rate of reaction for H2: -2 * d[H2]/dt
rate of reaction for CH3OH: d[CH3OH]/dt
where d[CO]/dt, d[H2]/dt, and d[CH3OH]/dt represent the changes in concentration of CO, H2, and CH3OH over time.
b) The rate of change in the concentration of CH3OH is directly proportional to the rate of consumption of hydrogen, given by 3.0 x 10-5 mol/(L * sec). So, the increase in the concentration of CH3OH can be calculated as:
d[CH3OH]/dt = 3.0 x 10-5 mol/(L * sec).
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an aqueous cscl solution is 8.00 percent by mass cscl. what is the boiling point of this solution? kb
The boiling point of this solution is 373.17 K or 100.484°C
The boiling point of aqueous cesium chloride (CsCl) solution is dependent on its concentration, but the boiling point elevation due to the solute can be calculated using the formula:
ΔT = Kb x molality.
The molality of the solution can be calculated from its mass percentage:
mass % CsCl / (molecular weight of CsCl) = molality
8.00 g CsCl / (168.39 g/mol) = 0.0474 mol/kg
ΔT = 0.51 K/m x 0.0474 m = 0.0244 K
Thus, the boiling point of the 8.00% aqueous CsCl solution would be raised by 0.0244 K above the boiling point of pure water, which is 100.00 °C.
The boiling point of the solution would be 100.00 °C + 0.0244 K = 100.0244 K or 100.484 °C = 373.17 K.
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40 points //
What are some other proteins that genes code for?
Answer:
Genes can code for a wide variety of proteins, including enzymes, hormones, structural proteins, and receptors. Examples of enzymes include DNA polymerase, proteases, and kinases. Examples of hormones include insulin, glucagon, and growth hormone. Examples of structural proteins include collagen, keratin, and actin. Examples of receptors include G-protein coupled receptors, ion channel receptors, and nuclear receptor proteins.
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The genes in DNA encode protein molecules, which are the "workhorses" of the cell, carrying out all the functions necessary for life.
Calculate the pressure (in atm) of ClF3 in a 5.00 L flask at 125 °C, when it is formed in the reaction of 10.0 g of Cl2 and 10.0 g of F2.ANS: 1.15 atmExplain your answer.
The pressure (in atm) of the ClF₃ in the 5.00 L flask at 125 °C, when it is formed in the reaction of the 10.0 g of Cl₂ and the 10.0 g of F₂ is 28.8 atm.
The mass of the Cl₂ = 10 g
The moles of the Cl₂ = 10 / 70.9
= 0.141 mol
The mass of the F₂ = 10 g
The moles of the F₂ = 10 / 37.9
= 0.263 mol
The equation is :
Cl₂ + 3F₂ ------> 2ClF₃
Initial 0.141 0.263 0
React 0.141 0.423 0.282
End 0 0.16 0.282
Total moles = 0.16 + 0.282
= 0.442
P = n RT / V
P = ( 0.442 × 0.821 × 398 ) / 5
P = 28.8 atm
The pressure is 28.8 atm.
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what is the gauge pressure in millimeters of mercury inside a soap bubble 0.136 m in diameter? mm hg
The gauge pressure inside a soap bubble 0.136 m in diameter is 0.00035 mmHg.
Gauge pressure is the pressure relative to atmospheric pressure. It is measured in units such as millibars, inches of mercury, or pounds per square inch (psi). Gauge pressure is the pressure above or below atmospheric pressure. A negative gauge pressure indicates a vacuum, while a positive gauge pressure indicates a pressure higher than atmospheric pressure. Gauge pressure is important in many applications, such as determining the pressure of a gas inside a closed container, measuring water pressure in a plumbing system, and measuring tire pressure in a car.
The gauge pressure inside a soap bubble 0.136 m in diameter can be calculated using the equation P = 4σ/r, where P is the gauge pressure, σ is the surface tension of the soap solution, and r is the radius of the bubble. Assuming the surface tension of the soap solution is 0.0725 N/m, the gauge pressure inside the bubble is 4σ/r = 4 * 0.0725 N/m / (0.136 m / 2) = 0.262 N/m = 0.262 * 0.00133 N/mmHg = 0.00035 mmHg. Therefore, the gauge pressure inside a soap bubble 0.136 m in diameter is 0.00035 mmHg.
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curved arrow notation is often used to show electron movement in resonance structures. from which part of a lewis structure can a curved arrow start from? select all that apply.
A curved arrow can start from an electron pair, a σ bond (single bond) or a π bond (double bond).
In chemical structures, a Lewis structure represents the distribution of electrons in a molecule. A curved arrow notation is used to depict the movement of electrons in a molecule, which helps in visualizing the flow of electrons in chemical reactions or to represent resonance structures.
A curved arrow can start from an electron pair, a σ bond (single bond) or a π bond (double bond) as they all involve the movement of electrons. Starting the arrow from a positive charge or hydrogen atom is not possible as they do not involve the movement of electrons.
By using curved arrow notation, one can easily depict the flow of electrons in chemical reactions such as addition reactions, substitution reactions, electron transfer reactions, etc.
The problem seems incomplete, it must have been...
"Curved arrow notation is often used to show electron movement in resonance structures. From which part of a Lewis structure can a curved arrow start from? select all that apply.
A curved arrow can start from
a positive charge
an electron pair
a σ bond
a π bond"
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Based on the passage, which amino acid will most likely react with phosphine? cysteine has sulfhydryl groups and can make disulfide bonds. Methionine is the other amino acid that is sulfur containing, but cannot make disulfide bonds.
Cysteine is the amino acid that will most likely react with phosphine.
Cysteine contains sulfhydryl (-SH) groups that can form disulfide bonds (-S-S-) with other cysteine residues in a protein. This is important for maintaining the proper 3-dimensional structure of the protein.
Phosphine is a highly reactive gas that can react with the sulfhydryl groups of cysteine.
Methionine, on the other hand, is also a sulfur-containing amino acid, but it does not have the ability to form disulfide bonds. This means that it is unlikely to react with phosphine.
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what are the three steps involved in evaluating the enthalpy changes associated with solution formation?
The three steps that are involves in the evaluation of the enthalpy changes that are associated with the solution formation are the separation of the solute particles, separation of the solvent particles and then mixing the solute and solvent particles.
For the evaluation of the enthalpy changes which are associated with the formation of the solution, we first separate the solute into its constituent particles. This step is always the endothermic step because there is energy required to overcome the forces that hold these solute particles together.
The second step involves the separation of the the solvent particles from each other in order to make space for the solute particles. This step is also an endothermic step because energy is needed to overcome the intermolecular forces among the solvent particles.
The final step is the mixing of the solute particles along with the solvent particles. This step is an exothermic step because energy is getting released as the solute particles are interacting with the solvent particles through the various types of intermolecular forces.
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6.The ________ gives you a measure for identifying ____ and ___. pH stands for _____ __ _____ , and the scale ranges from _____ to . A pH of ____ means extremely ________ and a pH of ___ means extremely _________.
This is science work
pH is a measure of how acidic/basic solution is. The range goes from 0 – 14, with 7 being neutral.
How is pH determined?A fluid's pH serves as a gauge for hydrogen ion concentration. Acid and base concentrations are measured using pH, which is the negative logarithm of hydrogen ion concentration expressed in moles per liter. A chemical scale called pH (pronounced "piet") is used to measure how acidic or basic an aqueous solution is. "Potential of hydrogen" (or "power of hydrogen") was the previous term used.
Although pH appears on the periodic table as an element, it is actually a unit of measurement. Potential hydrogen, or pH, tells us how much hydrogen is present in liquids and how active the hydrogen ion is.
.The pH scale gives you a measure for identifying acid and base. pH stands for potential of hydrogen , and the scale ranges from 1 to 14 . A pH of 1 means extremely acidic and a pH of 2 means extremely basic.
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calculate the formal charge on each second-row atom: 2xsafari o
Formal charge on an atom is calculated by subtracting the amount of valence electrons associated with the atom from the number of electrons assigned to it in the Lewis structure of a molecule.
To calculate the formal charge on a second-row atom, we must first determine the molecule's Lewis structure. The formal charge on the second-row atoms cannot be determined without knowing the Lewis structure. the formal charge on each second-row atom: 2xsafari o charge on an atom is calculated by subtracting the amount of valence electrons associated with the atom from the number of electrons assigned to it in the Lewis structure of a molecule. calculate the formal charge on a second-row atom, we must first determine the molecule's Lewis structure.
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When you need accurate measurements of chemicals, you can use only glassware that has been calibrated- accuracy requires careful delivery of the measured chemical - some volume markings are only estimates. - all volume markings make accurate measurements. REVIEW Question 15 of 15 < BACK ED o D be here to search
The first response is the one that is proper in this case since accurate delivery of the measured substances is necessary.
Before measuring any chemical, calibration is performed to remove any type of instrument error, ensuring that the reactions carried out with the assistance of the chemical being measured will offer a fair yield. For precise measurements, there are two key prerequisites: We need to be aware of the relevant tools. To use these tools correctly, we must be knowledgeable in their application. To take precise measurements, the following two conditions must be met: All of these calculations must be completed precisely using the standard units. 2 You must use the right tools and understand how to use them effectively in order to take precise measurements.
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Pentane is a particularly nonpolar liquid. Which of the following is likely to be very miscible with pentane?
Select all that apply: A very polar liquid A liquid that is slightly less polar than pentane A liquid that has precisely the same polarity as pentane
None of the above
Here are the two correct options i.e. (B) & (C) i.e. A liquid that is slightly less polar than pentane & A liquid that has precisely the same polarity as pentane respectively.
Pentane is a nonpolar liquid, meaning that it has an evenly distributed distribution of electrical charge across its molecular structure. A very polar liquid, meaning one with a highly uneven distribution of electrical charge, is unlikely to be miscible with pentane because the polar and nonpolar molecules will not mix due to their opposite charges. A liquid that is slightly less polar than pentane is more likely to be miscible with pentane. This is because the difference in polarity between the two liquids is not as significant, and they will have a greater tendency to mix. A liquid that has precisely the same polarity as pentane is also likely to be miscible with pentane. This is because the two liquids have an equal distribution of electrical charge and will therefore mix easily.
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Question - Pentane is a particularly nonpolar liquid. Which of the following is likely to be very miscible with pentane? Select all that apply: (A) A very polar liquid
(B) A liquid that is slightly less polar than pentane
(C) A liquid that has precisely the same polarity as pentane
(D) None of the above
Find the volume in liters, of 5.8 x 1023 molecules of CH4.
Which can distinguish between RNA and DNA? a) Presence of 3-OH c) Presence of a phosphate b) Presence of 2-OH d) Presence of a negative charge on "backbone"
The presence of a 2'-OH can be able to distinguish between RNA and DNA.
Hence, the correct option is option b) Presence of 2'-OH
The RNA and the DNA are nucleic acids which are responsible for carrying the genetic information in the cells of different living organisms.
DNA are double stranded whereas the RNA are single stranded. The additional 2' hydroxyl group or the 2'OH which is present in RNA, but lacking in DNA, has some effects that range from the biogenesis of life on earth up to how RNA oligonucleotides should be stored and it what distinguishes DNA from RNA.
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What kinds of atomic nuclei were present when fusion ceased at the end of the era of nucleosynthesis?
A) only hydrogen. B) only helium. C) hydrogen and helium
D) trace amounts of deuterium and lithium
At the end of the era of nucleosynthesis, which lasted from a few minutes to a few million years after the Big Bang, the atomic nuclei present in the universe were primarily hydrogen (about 75%) and helium (about 25%). So the corrrect option is C) hydrogen and helium.
However, as the universe expanded and cooled, the temperature and pressure conditions became too low to allow for further fusion, and the abundance of heavier elements remained relatively small (trace amounts).
This is why the composition of the universe today is dominated by hydrogen and helium, with only small amounts of other elements present.
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why kio4 is added for determination of manganese in steel
KIO4 is added for the determination of manganese in steel because it reacts with manganese (IV) oxide to form a highly colored complex that can be easily quantified.
KIO4 is added for the determination of manganese in steel because it reacts with manganese to form a complex that can be easily quantified. Manganese (IV) oxide is a common impurity in steel and its presence can affect the mechanical and physical properties of the steel.
In the presence of KIO4, manganese (IV) oxide is oxidized to manganese (VI) oxide. The reaction between KIO4 and manganese (IV) oxide is as follows:
2 MnO2 + 4 KIO4 + 6 H2O → 2 MnO4^- + 8 K^+ + 12 H^+
The resulting complex, MnO4^-, is highly colored and can be easily quantified using spectrophotometry. The intensity of the color is proportional to the amount of manganese (IV) oxide in the steel sample. By determining the amount of manganese in the steel, the purity of the steel can be evaluated and its suitability for different applications can be determined.
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you have a box of sodium chloride (salt), which has a molecular weight of 58.4 grams/mol. you weigh out 5.84 grams of sodium chloride and dissolve it in water to give a total volume of 0.2 liter. what is the molarity (m) of the solution that you have made?
Answer:
Molarity (M) is a unit of concentration that expresses the number of moles of solute (in this case sodium chloride) per liter of solvent (water). To calculate the molarity of the solution, you need to know the number of moles of sodium chloride present and the total volume of the solution.
To find the number of moles of sodium chloride present, you can use the formula:
moles = mass / molar mass
where mass is the amount of sodium chloride you weighed out (5.84 grams) and molar mass is the molecular weight of sodium chloride (58.4 grams/mol).
moles = 5.84 / 58.4 = 0.1
To find the molarity of the solution, you can use the formula:
molarity = moles / liters
where moles is the number of moles of sodium chloride present (0.1) and liters is the total volume of the solution (0.2 liters).
molarity = 0.1 / 0.2 = 0.5 M
So the molarity of the solution is 0.5 M
What should you do if the solid does not completely dissolve in the solvent? a) Draw up the liquid with a pipette and leave the solid b) Filter the sample c) Keep stirring until it dissolves d) Add more solid so more dissolves
b) Filter the sample. If a solid does not completely dissolve in a solvent, the undissolved solid particles can be removed by filtering the sample. This is usually done by passing the mixture through a filter paper.
If a solid does not completely dissolve in a solvent, it is important to properly handle the mixture to obtain a clear solution. One option is to filter the sample to remove the undissolved solid particles. This can be done by passing the mixture through a filter paper or a filter apparatus. The filtered solution can then be used for further analysis or experimentation. Another option is to keep stirring the mixture in the hope that the solid will eventually dissolve. If this is not successful, adding more of the solid to the solvent may help increase the solubility of the substance. However, it is important to consider the solubility limits of the substance in solvent the solvent and to not exceed them, as this may result in a saturated solution.
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3. C2 JUN 08 Q1
Select, from the list below, the compound that can be polymerised to give
CH,
A 2-methylbut-1-ene
B 2-methylbut-2-ene
C pent-1-ene
D pent-2-ene
H
C-C
H
CH₂CH,
[1]
(B) 2-methylbut-2-ene. 2-methylbut-2-ene, can be polymerized to form longer chain polymers through addition reactions with other alkene molecules.
What is 2-methylbut-2-ene?2-Methylbut-2-ene is an alkene hydrocarbon molecule with the chemical formula C5H10. It comprises a carbon skeleton with five carbon atoms and 10 hydrogen atoms. The molecule contains a double bond between the second and third carbon atoms and a methyl group (-CH3) attached to the second carbon atom.
Explain the term polymerization?Polymerization is the process of forming long chains of repeating units, called polymers, from smaller molecules, known as monomers. The process involves the covalent bonding of monomers through addition reactions.
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In one or two sentences, explain how Rutherford's model of an atom changed scientific knowledge and describe the evidence that justified the model.
Rutherford's atomic model changed scientific knowledge through his discovery of the nucleus of the atom and through the discovery of the proton.
The evidence that justified the model was that Rutherford discovered that only a small fraction of alpha particles were bent at extreme angles, which might be explained by an atom with a tiny, compact, and positively charged nucleus at its core.
What is Rutherford's atomic model?Rutherford's atomic model is the planetary orbital model showing an atom has a tiny, compact, positively charged core called a nucleus, in which almost all of the mass is concentrated, and light, negatively charged particles called electrons circulate at a distance around it, much like planets orbit the Sun.
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does a sodium atom tend to lose one elctron when it reacts t or f
The statement 'sodium atom tend to lose one electron when it reacts' is true because sodium is a metal with a single valence electron that readily loses that electron to form a positive ion.
A sodium atom tends to lose one electron when it reacts because sodium as a metal have a single valence electron which loses that electron to form Na+.
This tendency is due to the electron configuration of sodium, which is [Ne] 3s1. The electron in the 3s orbital is relatively far away from the positively charged nucleus and therefore can be easily removed.
The loss of this electron leads to the formation of a positively charged sodium ion, which is more stable than a neutral sodium atom. This process of electron transfer is called ionization.
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Organize information about how synthetic materials impact society and the environment
Natural resources are used to make both natural and synthetic products.
If you go back far enough in time, you will find that all of the materials used to make a product are from our world.
What are synthetic products?Instruments used in the financial sector called synthetic products can mimic the trading of real assets or goods. They manifest themselves as commodities-based securities.
Synthetic goods cannot be consumed by the average person like food or beverages. They exist as contracts. However, they can be purchased, sold, and traded just like food and beverages.
Derivatives are the terms used to describe these contracts (bonds, stocks). The term implies that these securities frequently rely on the market for actual commodities, such as the goods produced by the agricultural industry. However, the person holding a synthetic product does not partake in, say, actual farming.
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What happened to the rate of the reaction when the temperature was decreased?
Explain the effect of temperature on reaction rate in terms of collision theory. Your answer should include at least four complete sentences.
detailed please, thank you.
a laboratory procedure calls for 50.00 ml of na2co3 solution with a concentration of 0.500 m. what mass of na2co3 is required to prepare this solution?
The laboratory procedure for the 50.00 ml of Na₂CO₃ solution with the concentration of the 0.500 M. The mass of Na₂CO₃ is required to prepare the solution is 2.64 g.
The concentration of the Na₂CO₃ , M = 0.500 M
The volume of the Na₂CO₃, V = 50 mL
The molarity expressed as follows :
Molarity = moles / volumes in L
Moles = molarity × volume
Moles = 0.500 × 0.050
Moles = 0.025 mol
The moles of the Na₂CO₃ = mass / molar mass
The molar mass of the Na₂CO₃ = 105.9 g/mol
The mass = moles × molar mass
The mass = 0.025 × 105.9
The mass = 2.64 g
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