Remove the sample from the sample chamber, turn off the light bulb and clean up around the spectrophotometer.
There are methods for determining the concentration of a sample. Here are our options. UV Photomedium The correct answer for the UV spectrum is all I need? This allows me to determine the concentration in the UV spectrum photometer. Absorption of visible light by compounds creates distinct spectra. Different spectrum is what it means. you can see what it looks like. Interaction bits are between light and matter. If a sample is given here and absorbs light, allowing an absorber to absorb it, a different spectrum will be seen.
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How are the elements in hydrogen chloride bonded together? helpp
Explanation:
Chlorine has a higher electronegativity than hydrogen, but the chlorine atom's attraction for electrons is not sufficient to remove an electron from hydrogen. Consequently, the bonding electrons in hydrogen chloride are shared unequally in a polar covalent bond.
Question 3 (1 point)
The average atomic mass of molybdenum (Mo) is 95.94 amu. Which of the following
isotopes must have the highest percent abundance?
Mo-96
Not enough information to tell
Mo-95
Mo-94
Answer:
Mo-96
Explanation:
We know that isotopes are elements that have different numbers of neutrons while electron and proton numbers stay the same. Some isotopes exist in greater numbers than others. The atomic mass is the average of all the existing isotopes of an element. Therefore, the number the atomic mass is closest to is the most abundant isotope. We can round 95.94 to 96 because that is the closest number. That means that Mo-96 is the most abundant.
the process in which the nuclei of unstable atoms can become more by emitting particesl and/or electromagnetic radiation is called
The process in which the nuclei of unstable atoms can become more by emitting particles or electromagnetic radiation is called radioactive decay.
In the process of radioactive decay an unstable atomic nucleus loses energy by electromagnetic radiation.This involves transformation of one element into another by changing the number of protons in the nucleus.It is the emission of energy in the form of radiation. This occurs due to instability of nucleus.emission of energy in the form of radiation.
Radioactivity is a source of heat.It causes a huge amount of energy released into the surrounding in the form of ionising radiation.This includes alpha ,beta and gamma rays.
After undergoing radioactive decay,it tends to transform into the atom of some other elements known as decay products.
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several possibilities have been suggested for the support of life on titan, including methane rivers and lakes, and the possible presence of subsurface, liquid water aquifers. if life were present in these two different liquid reservoirs, what might be the key differences between them, and why?
In addition to rivers and oceans, Titan appears to feature lakes of liquefied ethane and methane, which some scientific studies hypothesize could support fictitious non-water-based life.
What are the key differences between these two liquid reservoirs if life were present in them?Titan's atmosphere is primarily composed of nitrogen, just like Earth's, but it has a surface pressure that is 50% higher. Titan’s rivers, lakes and seas of liquid methane and ethane might serve as a habitable environment on the moon’s surface, though any life there would likely be very different from Earth’s life.It is probable that there is a coat of liquid water underneath its ice shell in addition to the small and big masses of liquid methane & ethane that are present on the surface. According to some scientists, these liquid mixtures could offer prebiotic biochemistry for living cells that are different from those seen on Earth.To know more about life on Titan, visit:
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Write the condensed ground-state electron configuration of the transition metal ion mn2+. Is it paramagnetic?.
Answer: CONDENSED ELECTRON CONFIGURATION FOR MN2+ =
1.[Ar} 4[tex]s^{2[/tex] 3[tex]d^{3}[/tex]
2.This is paramaganetic
Explanation:
1. On the periodic table, you first find Mn which is in the "d block section"
The condensed electron configuration of Mn is [Ar} 4[tex]s^{2[/tex] 3[tex]d^{5}[/tex] however since the charge is 2+ this means that the atom is losing two-electron. So configuration as stated before is [Ar} 4[tex]s^{2[/tex] 3[tex]d^{3}[/tex]
2. This Configuration is paramagnetic since the "d" orbitals are not all filled with electrons.
Hope this helps someone out!
3H₂SO4 + 2B(OH)3 → B2(SO4)3 + 6H₂O What is the mole ratio between sulfuric acid and boron hydroxide?
From the balanced reaction equation shown, the mole ratio of the sulfuric aid and the boron hydroxide is 3:2.
What is the mole ratio?We know that in a chemical reaction, there are two sides; the reactants side and the products side. In the reactants side, what we have are the species that were combined to be able to get the products that we would have on the right hand side.
We have to recall that the way the reaction takes place and the formula of the products that are formed depends on the formula of the reactants as well as the mole ratio of the reactants. The mole ratio has to do with the stoichiometric coefficients of the reactants and the products in the reaction.
We now have to study the reaction closely so that we can be able to obtain the mole ratio of the sulfuric acid and the boron hydroxide.
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The boiling point of SeOF2 is less than the boiling point of SeOCl2.
a) Identify the type(s) of intermolecular force(s) that the two substances have in common.
b) Explain the difference in boiling points based on the types and relative strengths of intermolecular forces.
The intermolecular force that is common to both is the dipole forces
b) The lesser molecular mass of [tex]SeOF_{2}[/tex] made it to have a lesser boiling point.
What is the intermolecular forces?We know that apart from the forces that holds the atoms together in a molecule, there is yet another force that holds the molecules together in a particular state of matter. Let us recall that matter is anything that has mass and occupy space.
If we look at the two compounds that we have, it is clear that the commonality between the two compounds is that the both of them are held together by the dipole forces because the molecules are composed of atoms that are polar.
On the other hand, there is a dispersion force that is found in every molecule. The magnitude of the dispersion forces depends on the molecular mas of the molecule. Given that [tex]SeOCl_{2}[/tex] has a greater molecular mass than [tex]SeOF_{2}[/tex], it would necessarily have grater boiling point than the later.
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what is the difference between the 2 types of igneous rocks
Answer:
The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.
Explanation:
according to the crystal field theory (cft), the crystal field stabilization energy (cfse) depends on:
The magnitude of the crystal field stabilization energy in the octahedral field depends on (I) the nature of the ligand. (II) the charge of the metal ion; (III) whether the metal is in the first, second, or third row of the transition elements;
The crystal field stabilization energy is defined as the energy of the ligand field electronic configuration minus the energy of the isotropic field electronic configuration. CSFE depends on several factors, including: geometry (d changes the orbital splitting pattern) d number of electrons.
The splitting is pompous by the following-
The nature of the metal ion.
Oxidation state of metals. ...
Arrangement of ligands around metal ions.
Metal coordination numbers (i.e. tetrahedral, octahedral).
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Would zinc be feasible to remove the copper outer layer and recover it from hydrochloric acid instead of zinc core? why or why not?
zinc is more reactive than hydrogen it displaces hydrogen in dilute hydrochloric acid.
Life cannot exist without the chemical element zinc (Zn), which belongs to Group 12 (IIb, or the zinc group) of the periodic table and is one of the most widely utilized metals. Zinc has a significant commercial significance.
Average zinc content per ton in the Earth's crust is 65 grams (2.3 ounces), which is somewhat greater than copper. The primary zinc mineral, sphalerite, as well as its oxidation products, smithsonite and hemimorphite, make up almost all of the world's zinc ore. Native zinc deposits have reportedly been discovered in Australia, New Zealand, and the US. The main producers of zinc at the start of the twenty-first century are China, Australia, and Peru.
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If the half-life of a radioactive substance is 950 million years and you have 96
atoms of it, how many half-lives will have passed by the time that 6 atoms of
the substance remain?
OA. 2
OB. 5
OC. 4
O D. 6
SUBMIT
There would be a total of about 4 half lives
What is the half life?Half-life is a term used in nuclear physics and chemistry to describe the amount of time it takes for half of a given quantity of a radioactive substance to decay. It is the time required for half of the original quantity of the substance to undergo radioactive decay.
We know that;
N/No = (1/2)^t/t1/2
6/96 = (1/2)^t/950 * 10^6
(1/2)^4 = (1/2)^t/950 * 10^6
4 = t/950 * 10^6
t = 3.8 * 10^9
Number of half lives = 3.8 * 10^9/950 * 10^6
= 4 half lives
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4.in activity 1, why did the ph of the buffer solutions change after the addition of 10 drops of 0.1 m naoh?
The Ph of the buffer solutions change after the addition of 10 drops of 0.1m NaOH because when a strong base (OH-) is added to the buffer solution, the hydroxide ions are consumed by the weak acid that results forming water and the weaker conjugate base of the acid.
A buffer solution is an aqueous solution which consists of a mixture of weak acid and its conjugate base. Its PH changes in little amounts when we add small quantity of acid or base to it.
When we add a strong base (OH-) to the buffer solution, the hydroxide ions are consumed by the weak acid which results in forming water and the weaker conjugate base of the acid. As a result the amount of the weak acid decreases while the amount of the conjugate base increases.
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a particular compound contains, by mass, 41.4 % carbon, 3.47 % hydrogen, and 55.1 % oxygen. a 0.050-mol sample of this compound weighs 5.80 g. the molecular formula of this compound is
The molecular formula of this compound is C4H4O4 .
What is molar mass ?
In chemistry, the molar mass of a compound is defined as the mass of a sample of that compound divided by the amount of substance. This is the number of moles in that sample measured in moles. Molar mass is a mass property, a molecular property of matter. Molar mass is the average of many instances of a compound that often differ in mass due to the presence of isotopes . Most commonly, molar mass is calculated from standard atomic masses, so it is a global average and a function of the relative isotopic abundances of constituent atoms on Earth. Molar mass is good for converting between the mass of a substance and the quantity of a bulk substance.
1 mol contains 5.8/0.05 g = 116 g
of which 48 g is carbon
64g is oxygen remaining 4g hydrogen
4-C, 4-O, 4-H
C4H4O4
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I NEED HELP WITH THIS WHOLE PAGE
1) The endocrine glands pictured above are:
Thyroid Gland and Parathyroid glandAdrenal GrandOvariesPancreatic GrandPitutuary GlandPineal Gland.2) Organs of the endocrine system are often called glands. An organ is responsible for the production of one or more substances such as hormones, digestive juices, perspiration, tears, saliva, or milk.
The compounds are released directly into the circulation by the endocrine glands. The compounds are released by exocrine glands into a duct or aperture to the interior or outside of the body.
3) Pituitary Gland produces the following hormones:
Adrenocorticotropic hormone Follicle-stimulating hormoneGrowth hormone (GH)Luteinizing hormone (LH) etc.What is the importance of the Endocrine system?The endocrine system regulates juvenile growth and development, adult body processes, and the reproductive process. All of the body's key activities and processes are controlled and regulated by the endocrine system: Energy management. Reproduction.
The pituitary gland, for example, is located at the base of the brain and is no larger than a pea. Despite its tiny size, the pituitary gland is sometimes referred to as the "master gland." Many other endocrine glands are controlled by the hormones it produces.
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what are some methods to purify water
Answer:
boiling it
Explanation:
the most simple way to purify water both at home and in the wild, is by boiling in kettle or if you are in the wilderness simply by boiling it over a fire.
One of the ways to purify water is by filtration.
What is filtration process?
Filtration is a physical separation procedure that uses a filter material with a complicated structure through which only fluid can flow to separate solid matter and fluid from a mixture. Oversize solid particles are those that cannot pass through the filter medium, and the fluid that does is known as the filtrate. Oversize particles can form a filter cake on top of the filter and also block the filter lattice, preventing the fluid phase from passing through the filter, a process known as blinding. The effective pore size of a filter is the size of the biggest particles that can successfully pass through it.
Water can be purified by the process of filtration.
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in the equation for photosynthesis: 6 h2o 6 co2 -> c6h12o6 6o2 which of the following is a reactant?
The process of photosynthesis is written as:
6CO2 + 6H2O → C6H12O6 + 6O2.
This means that reactants, six carbon dioxide molecules and six water molecules are converted by light energy captured by chlorophyll into a sugar molecule and six oxygen molecules which are the products.
What are reactants?
The substances which participate in a chemical reaction, are called reactants.When writing down chemical reactions, reactants are written on the left sideTo indicate that if a reaction has occurred, an arrow is written to the right of reactants, and the products are then written on its right side.Every chemical reaction is usually expressed as:Reactants → Products
The equation can be used to determine general reaction:A + B → C
In this example, A and B are reactants, and C is the product.
Such a reaction in which two or more than two reactants combine to form single product is called a Combination reaction.
In another reaction, for example: C → A + BThe reactant is C, and the products are A and B.
Such a reaction in which a single reactant decomposes into its constituents elements or compounds is called a Decomposition reaction
Here, in photosynthesis equation, reactants are 6CO2 and 6H2O
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Dna is composed of units called , each of which contains a phosphate group, a 5-carbon sugar, and one of 4 nitrogen-containing bases.
DNA is composed of units called nucleotide , each of which contains a phosphate group, a 5-carbon sugar, and one of 4 nitrogen-containing bases.
What is DNA?This is referred to as deoxyribonucleic acid and it is the genetic material of most organisms and ensures that traits are passed from the parent to offspring during the process of reproduction.
It is made up of units called nucleotide which contains different compounds such as the following below and is used for various purposes such as for identification.
A phosphate groupA 5-carbon sugar which is known as deoxyribose.Nitrogen-containing bases such as adenine, thymine etc.Read more about DNA here https://brainly.com/question/16099437
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a student seperated 51.4g of lawn sand into sharp sand and ammonium sulfate after seperation the total mass of the two products was 52.6g suggest a reason for the diffference in mass
The only possible reason for the difference in mass is if there is an error during weighing.
Law of conservation of massAccording to the law of conservation mass, masses cannot be destroyed, and neither can they be created. They can, however, change forms during the course of a process or reaction.
Going by this law, if the combined weight of the lawn sand and the ammonium sulfate is 51.4 grams, after separation, the addition of weights of the resulting sharp sand and that of the ammonium sulfate should equate to 51.4 grams.
But that is not the case here. The addition of their weights resulted in 52.6 grams. This means that something is not right somewhere.
It could be that the weight of the mixture was underestimated by error.It could be that the individual weight of the sharp sand and or the ammonium sulfate were underestimated due to error.Beyond these two reasons, the source of error could also be that the total mass of the two products was overestimated by error.
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a certain substance has a heat of vaporization of 71.77 kj/mol. at what kelvin temperature will the vapor pressure be 4.50 times higher than it was at 301 k?
At 318 kelvin temperature will the vapor pressure be 4.50 times higher than it was at 301k.
Given : [tex]P_{1}=p_{1},P_{2}=4.50p_{1},T_{1}=301k,H=71.77kj/mol[/tex]
Substituting in the given equation:
[tex]ln(4.50p_{1}/p_{1})=71.77*1000/8.314(1/301-1/T_{2})[/tex]
[tex]1.50=8632(1/301-1/T_{2})[/tex]
[tex]1.50=28.67-8632/T_{2}[/tex]
[tex]T_{2}=8632/21.17[/tex][tex]T_{2}=317K[/tex]
State Clausius-Clapeyron theorem.
The Clausius-Clapeyron relation describes the relationship between pressure and temperature at a non - continuous phase bridge between the two phases of matter of the a single constituent, with vapour pressure playing a key role.
State Clausius-Clapeyron equation
[tex]ln(p2/p1)=H/R(1/T_{1}-1/T_{2})[/tex]
P1 and P2 are the vapor pressures at temperatures T1 and T2H= the enthalpy of vaporization of the liquidR = the Universal Gas ConstantThus, at 318K temperature, the vapor pressure is 4.50 higher times than it was at 301K.
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the structure of one form of boron nitride is represented above. this form of boron nitride is one of the hardest substances known. which of the following best helps explain why boron nitride is so hard?
The structure of one form of boron nitride . this form of boron nitride is one of the hardest substances known as the boron nitride is the network solid of atoms that are covalently bonded with the fixed angle.
The boron nitride is the solid network of covalently bonded atom with fix angle. boron nitride will compressed to a super hard. its hardness based on the lattice work of the boron and the nitrogen atoms.
Thus, The structure of one form of boron nitride . this form of boron nitride is one of the hardest substances known as the boron nitride is the network solid of atoms that are covalently bonded with the fixed angle.
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the outer diameter of a spherical shell is 12cm and its inner diameter is 8cm. find the volume of a metal contained in the shell. also, find its outer surface area.
The shell's outside surface area is 452.57 cm2 and its inside metal volume is 636.95 cm3.
How is metal created?Atomic components like electrons, neutrons, & protons make up metals. The quantity of protons in an atom can be used to identify it from an atom of another element. About 25% of the earth's crust is made up of metals.
Diamond: Is it a metal?Diamond is merely an allotrope of carbon; it is in no manner a metal. It doesn't display any of the physical or chemical characteristics of metals, such as their electrical properties, malleability, ductility, or how they react to acids or salts, among other things.
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If carbon dioxide is removed from a plant’s environment, what would you expect to happen to the plant’s production of carbohydrates?.
The plant’s production of carbohydrates stops producing high-energy sugars altogether.
When carbon dioxide is completely removed from a plant's environment it is expected that the plant will stop producing energy-rich sugars altogether.CO2 is required for plants to photosynthesize. So without CO2, plants have no way to make energy. In this scenario, it will probably wither.
Carbon dioxide is an important greenhouse gas and helps trap heat in the atmosphere. Without them, our planet would be uninhabitable and cold. Plant photosynthesis produces oxygen and carbohydrates in a strict ratio, so we run out of oxygen as soon as we eat. But lethal levels of carbon dioxide will be reached long before these things happen.
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what is the carbon concentration of an iron-carbon alloy for which the fraction of total ferrite is 0.94
The carbon concentration of an iron-carbon alloy for which the fraction of total ferrite is 0.94 is 0.423.
Alloy is a substance that is composed of two or more metals or of a metal and a non - metal which are united among themselves by fusion in their molten state.
Iron-carbon alloy is an alloy than contains iron(metal) and carbon(non-metal) as its constituents.
Carbon concentration of iron-carbon alloy is calculated as follows:
W = {C (Fe₃C) - C₀} / {C (Fe₃C) - C}
⇒ 0.94 = (6.7 - C₀) / (6.7 - 0.022)
⇒ 0.94 × 6.678 = 6.7 - C₀
⇒ 6.277 = 6.7 - C₀
⇒ C₀ = 6.7 - 6.277
⇒ C₀ = 0.423
Hence, the carbon concentration of an iron-carbon alloy for which the fraction of total ferrite is 0.94 is 0.423.
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uppose you have two identical 1.0 l sealed containers. both containers are kept at exactly 25oc. one vessel contains only neon gas at 1.5 atm, and the other contains only xenon gas at 1.9 atm. is the value for the moles of neon less than, equal to, or greater than that of xenon? explain.
The total kinetic energy of a gas's molecules is influenced by its temperature and molar mass. However, all gases have same kinetic energy average when the temperature is the same.
What is the purpose of a xenon?In some specialized light sources, xenon is employed. It is activated by an electrical discharge, which results in a stunning blue glow. Sunbed lamps, bactericidal lamps for use in food processing, and high electrical flash bulbs for photographers are all uses for xenon lamps.
What makes xenon unique?One of the noble gases, xenon is odorless, tasteless, colorless, and chemically inert. Although not hazardous by itself, its components are potent oxidizers that are extremely toxic.
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If you made a voltaic cell out of this reaction, what half-reaction would be occurring at the cathode, and what half-reaction would be occurring at the anode?.
An (aq) + 1 e⁻ → A⁻(aq) at the cathode and B(aq) → B⁺(aq) + 1e⁻ at the anode.
Oxidation is lost at the anode consequently, the oxidation 1/2-response happens in the 1/2-cellular containing the anode. discount is received at the cathode so the reduction half-response takes place in the 1/2-mobile containing the cathode. the only one with the highest discount potential might be what you need to pick out because the reduction 1/2-response and therefore be your cathode.
The one with the lowest reduction potential will be what you want to select as the oxidation-1/2 response and consequently be your anode. The response at the anode is oxidation and that on the cathode is discount. right here, the anode is superb and the cathode is the terrible electrode. The anode is the electrode where electricity moves into. The cathode is the electrode in which power is given out or flows out. The anode is typically the effective aspect. A cathode is a poor side.
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most alcohols are soluble in methanol or ethanol. explain why these compounds are not used as solvents in the tcica test.
Because the Trichloroisocyanuric acid (TCICA) test is used to separate primary from secondary alcohols. Both major alcohols, methanol, and ethanol will undergo TCICA's oxidation process. Consequently, acetonitrile is employed as the solvent for the TCICA test rather than one of these.
What is TCICA test?
Simple primary and secondary alcohols can easily be separated from one another based on how quickly they oxidize when exposed to trichloroisocyanuric acid (TCICA). The TCICA test is carried out by adding the unknown to a solution of TCICA in acetonitrile3 containing hydrochloric acid4 and timing how long it takes for a precipitate5 to develop. Secondary alcohols respond quickly while primary alcohols react more slowly.
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A student titrates an unknown amount of potassium hydrogen
phthalate (KHC%H4O4, often abbreviated KHP) with 20.46 mL
of a 0.1000-M NaOH solution. KHP (molar mass = 204.22 g/
mol) has one acidic hydrogen. What mass of KHP was titrated
(reacted completely) by the sodium hydroxide solution?
The mass of KHP titrated by the sodium hydroxide solution is 0.4178 g.
What is the balanced equation for this case?
[tex]HC_{8} H_{4} 0_{4} K + NaOH[/tex] ==> [tex]C_{8} H_{4} O_{4}KNa + H_{2}O[/tex]
moles of NaOH used = 0.02046 L x 0.1000 moles/L = 0.002046 moles
NaOH = 0.002046 moles KHP (1:1 mole ratio from balanced equation).
Mass KHP = 0.002046 moles KHP x 204.22 g/mole =
= 0.41783 grams = 0.4178 g (to 4 significant figures
What are titrations?
Titration is the process of gradually adding one solution with a known concentration (referred to as a titrant) to the known volume of another solution with an unknown concentration. The titrant is added until the second solution's unknown concentration is neutralised by the titrant, which is frequently visible by a change in colour when employing an indicator.
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Help ASAP the question is in the picture
Answer:
1. Pharynx
2. Larnyx
3. Mouth
4. Trachea
5. Lungs
6. Diaphragm
7. Bronchi
8. Alveoli
9. Nasal Cavity
10. Bronchioles
Bomb calorimetry is best for determining heat values. Because we cannot have a bomb calorimeter for every pair of students, we use what is readily avaliable. Why would two styrofoam cups be an economical way of determining these heat values and what is the of the major pitfalls of using this system?.
Answer:
Using styrofoam cups is obviously a lot cheaper than using precise equipment, but it can still do the same job. However, remember that styrofoam cups are not exact and leave a lot of room for error.
The answer to the second part is: Calibration of Setup
Explanation: You can use these cups because their walls are insulated which prevents the transfer of heat between the system and its surroundings.
If 1 egg and 1/3 cup of oil are needed for each bag of brownie mix, how many bags of brownie mix do you need if you want to use up all 3 eggs and 1 cup of oil?
The amount of brownie mix bags needed to use up 3 eggs and 1 cup of oil is 3, option C.
What is the basic stoichiometry for this problem?1 egg and 1/3 cup of oil is needed for a brownie mix bag
Therefore the brownie mix bags needed to consume 3 eggs and a cup of oil is equal to;
1 egg and 1/3 cup = 1 brownie mix bag
3 eggs and 1 cup = ?
Cross multiplied;
3/1 x 1 = 3
For one cup of oil and 3 eggs to be used up, it requires 3 bags of brownie mix.
The complete question is:
If 1 egg and 1/3 cup of oil are needed for each bag of brownie mix, how many bags of brownie mix do you need if you want to use up all 3 eggs and 1 cup of oil?
a. 1
b. 2
c. 3
d. 4
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