A polymer mixture p that has number-average and weight-average molecular weights of 120,000 and 300,000 and then Number average molecular weight is 110,000 g/mol
a) The number average molecular weight (NAM) is calculate using the mole numbers of each component. In this case, we will multiple each component molecular weight by the number of moles of each one. After that we will sum them and finally to divide by the total number of moles.
NAM = (Na*MA + Nb*MB)/(Nt)
NAM = (1 mol *120000 g/mol + 1*100000 g/mol ) /(2 mol)
NAM = 110000 g/mol
The number average molecular weight for the polymer P is 110,000 g/mol
We have a polymer P made up of two monodisperse fractions.
A with molecular weight of MA = 120000 g/mol and B with MB =100000 g/mol.
The batch contains an equal mole fraction of each component A and B.
Let's suppose a total number (Nt) of mols 2 moles. Equal fraction means XA = 0.5 and XB =0.5
Nt = 2 mol
Na = 2*0.5 = 1 mol
Nb = 2*0.5 = 1 mol.
So, we have 1 mol of A, 1 mol of B and 2 moles in total.
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What is the reason for having an engineering design process?
A. To be able to develop the most successful engineering product
B. To complete a scientific experiment
C. It’s the law of engineering.
D. The products will sell for more money.
Which of the following is NOT part of Dalton's Atomic Theory?
1. Atoms are composed of tiny subatomic particles.
2. Atoms that combine do so in simple, whole-number ratios.
3. All elements are composed of atoms.
4. Atoms of the same element are identical.
HELP ASAP PLEASE!!! POINTS:30 WILL GIVE BRAINLIST!!!
We know that the equilibrium constant is a value that shows us the position to which the equilibrium position would switch when a constraint is imposed. We know that the imposition of a constraint would cause the equilibrium position to shift to the left or to the right in such a way that seeks to annul the change that is causing it.
We know that if a product is added, the equilibrium position would shift to the left and more reactants are produced. On the other hand, if a reactant is added, the equilibrium position would shift to the right and more products are added.
Having said this;
If we add the H3O^+ ion, then the equilibrium would shift to the left and if it is removed the equilibrium would shift to the right.
If we add the OH^- ion, the equilibrium would shift to the left and when it is removed the equilibrium would shift to the right.
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hi there I have a question see my teacher wants me to record my self in how to solve a math problem but am so scared of many reasons one is that maybe no one is interested in what she wants me to do and am also scared that no one would like to be my friend so i would like some advice please
Answer:
just be yourself , if they are a good person that you want to be your friend they would support you and care about what you have to say.
Explanation:
Which of the following reactions are examples of substitution reactions?
Select all that apply.
A. Ethene reacts with hydrogen chloride.
B. Chloroethane reacts with a dilute potassium hydroxide solution.
C. Methane reacts with chlorine in the presence of sunlight.
D. Propene reacts with hydrogen in the presence of a platinum catalyst.
E. Ethene reacts with water in the presence of a dilute acid at 100°C.
C) Methane reacts with chlorine in the presence of sunlight is example of substitution reaction.
One atom from one molecule is replaced with an atom from another one in a substitution process.CH4 + Cl2 → CH3Cl + HClChlorine substitutes one hydrogen of methane. Therefore is a substitution reaction. It is a substitution reaction in which a chlorine atom replaces one of an alkane's hydrogen atom to produce an alkyl chloride. This reaction can only occur in the presence of light and produces both an alkyl halide and hydrogen chloride.Properties of chloromethane:It has a light odour and is a clear, colourless gas.It is highly flammable and poisonous.It weighs more than air. It is water soluble.If there is too much chlorine present, the process continues, and the four hydrogen atoms are all replaced by four chlorine atoms, forming carbon tetrachloride (CCl4).Therefore, Methane reacts with chlorine in the presence of sunlight is example of substitution reaction.
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The vapor pressure of pure cyclohexane is 32 torr at its freezing point of 6.55 celsius. calculate the vapor pressure of the solution in question 3 at this tempertaure.
The vapor pressure of the solution in question 3 at this temperature is
[tex]6.72[/tex] ×[tex]10^{-3}[/tex] torr.
What is vapour pressure?The pressure that a vapor exerts on its condensed phases (solid or liquid) in a closed system at a specific temperature is referred to as the equilibrium vapor pressure (or vapour pressure in English-speaking nations other than the US; see spelling variations).
An indicator of a liquid's evaporation rate is the equilibrium vapor pressure. It has to do with how easily liquid-borne particles tend to elude detection (or a solid). Volatile is a term used to describe a chemical that, at room temperature, has a high vapor pressure.
Vapor pressure is the force that a vapor cloud exerts over a liquid surface. The kinetic energy of a liquid's molecules rises as its temperature climbs.
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In order to change the phase/state of matter (like changing from a solid to a liquid or from a gas back to a liquid), what is added to or taken away from the substance? To go from a solid to a liquid to a gas, is it added or taken away? How about if you change from a gas to a liquid to a solid (added or taken away)?
Melting (from solid to liquid), freezing (from liquid to solid), evaporation (from liquid to gas), and condensation are examples of matter transformations (changing from gas to a liquid).
Melting is the process by which a material transforms from its solid state into its liquid state. Freezing is the transition of a material from its liquid state into its solid state. Evaporation is the process by which a material transforms from its liquid state into its gaseous state. Melting is the process of converting a solid into a liquid. The melting point is the temperature at which a material transforms from a solid to a liquid. At 0 degrees Celsius, water melts.
Heat is applied in this pattern of solid to liquid to gas in order to cause the phase transition.
Condensation is the process by which a material transitions from its gaseous state into its liquid state. Sublimation is the process by which a solid transitions directly from its solid state to its gaseous state.
A physical transition from one state of matter to another, such as from solid to liquid or from liquid to gas, is referred to as a change of state, sometimes known as a phase change.
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Find the number of atoms per square centimeter in silicon in the (100), (110), and (111) planes.
The number of atoms per square centimeter in silicon
in the (100) = [tex]6.78[/tex] ×[tex]10^{14}[/tex] [tex]atoms/cm^2[/tex]
in the (110) = [tex]9.59[/tex] ×[tex]10^{14}[/tex] [tex]atoms/cm^2[/tex]
in the (111) = [tex]7.83[/tex] × [tex]10^{14}[/tex] [tex]atoms/cm^2[/tex]
What is silicon?With the symbol Si and atomic number 14, silicon is a chemical element. It is a tetravalent metalloid and semiconductor that is crystalline, rigid, and brittle with a blue-gray metallic sheen. With carbon above it and germanium, tin, lead, and flerovium below it on the periodic table, it belongs to group 14. It rarely reacts, if at all.
Jöns Jakob Berzelius was able to prepare and characterize it for the first time in 1823, but this was delayed due to its high chemical affinity for oxygen. Silicates are a class of anions made up of its oxides. The only metalloid and nonmetal with melting and boiling points higher than its respective values of 1414 °C and 3265 °C is boron.
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1/ d. f blocks -... Consider the following elements C.Na, Mg, P, S. 17CL N Which of these can: a. Form hydrides by electrovalent binding b. Be used to catalyse a chemical reaction c. Be used in radioactive dating d. Form and acid anhydride e. Exhibit both metallic and non-metallic behavior
a)Elements that form hydrides by electrovalent binding are Sodium(Na), and Magnesium (Mg).
b)None of the elements is used to catalyze a chemical reaction and the elements that catalyze the reaction are platinum, cobalt, and iron.
c)Elements used in are radioactive dating [tex]C^{14}[/tex]
d)The element which forms acid anhydride is phosphorous (P).
e)The element that exhibits both metallic and non-metallic behavior is Metalloids.
The tabular display of chemical elements is the periodic table, Which contains 18 periods and 7 groups.
All the elements are configurable in the S, P, D, and F blocks.
S and D block elements mostly contain metals, and P- block contains non-metals and Metalloids.
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Would anyone help me solve all of this?
Answer:
Explanation:de
what to add to 2nahco3. —> na2co3 + co2 to balance it
Answer:
2NaHCO3---> Na2CO3+H2O+CO2
Explanation:
*Note, I'm assuming you forgot to add the H2O in your question, because the equation couldn't exist without it
How many dollars are in 140 dimes? using dimensional analysis
Answer:
1 dollar
Explanation:
URGENT!!
Observe the solubility chart below of Argon gas. According to the solubility chart below, what statement is TRUE about the solubility of argon gas and temperature of water in which it is dissolved?
a
As the temperature of the water increases, the solubility of Argon gas increases.
b
As the temperature of the water increases, the solubility of Argon gas decreases.
c
The solubility of Argon gas is the same for all temperatures shown.
d
The solubility of Argon gas is not dependent on temperature.
According to the solubility chart below the solubility of Argon gas is not dependent on temperature.
What is solubility ?The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility.
The solubilities of various compounds vary greatly, and this property of a particular solute-solvent pair is evident.
The addition of sugar cubes to a cup of tea or coffee serves as an example of a solution. A property that facilitates the dissolution of sugar molecules is solubility. Solubility is the property of a substance (solute) to dissolve in a certain solvent.
Solutes are divided into three categories: highly soluble, sparingly soluble, and insoluble based on the concentration at which they dissolve in a solvent.
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solids analysis is one of the most widely used parameters for assessing water quality. the following tests were performed on a water sample. the sample volume was 150 ml in each test (filtered or evaporated). calculate the parameters requested using the following data. (15 pts)
The total solids is 300 mg/L, volatile solids is 80 mg/L, total suspended solids is 224 mg/L, total dissolved solids is 76 mg/L and the volatile suspended solids is 26.66 mg/L
CalculationThe data we have is
Mass of evaporating dish, Mtare = 24.1520 g
sample volume V = 150 ml
As per the question
a) Total solids = All the solids present whether suspended or dissolved
= [(Mtare+solids - Mtare) x 1000mg x 1000ml ] / V
= [24.1970 - 24.1520] x 10^(6) / 150
= 300 mg/L
b) Volatile solids = portion of solids which are volatized at 550 C
= [(Mtare+solids - Mtare+ash)] x 10^(6) / V
= 24.1970-24.1850 x 10^(6) / 150
= 80 mg/L
c) Total suspended solids = solids that are non-filterable with specified filters and are not volatilized at 105 C
= [Msus solids+ tare +filter - Mtare+filter x 10^(6)] / V
= 1.4939 - 1.4603 x 10^6 / 150
= 224 mg/L
d) Volatile suspended solids = portion of suspended solids which are volatilized at 550C
= Mss+Tare+filter - Mresidue+Tare+filter x 10^(6) / V
= [1.4939 - 1.4899 x 10^(6)] / 150
= 26.66 mg/L
e) Total dissolved solids = solids which are present in solution and filterable
=(Total solids - total suspended solids)
= (300 - 224)
= 76 mg/L
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Does the pelvic bone support the intestines?
Yes, the pelvic bone support the intestines.
The pelvis, also known as the bony pelvis or the pelvic girdle, is a complex of bones that connects the trunk to the legs, supports and balances the trunk, and houses and supports the intestines, urinary bladder, and internal sex organs. It is also known as the "basin" or "bony pelvis" in human anatomy.
Major organs are located in the pelvic region, hidden by layers of muscles. The primary digestive organs, the intestines, are some of the most crucial. Bloating, constipation, or diarrhea, which are IBS symptoms, can cause pressure and pain in the pelvic area.
Therefore, yes the pelvic bone support the intestines.
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Magnesium (mg) has an hcp crystal structure, a c/a ratio of 1. 624, and a density of 1. 74 g/cm3. Compute the atomic radius for mg. Bryant
The atomic radius of Magnesium (mg) that has an hcp crystal structure, a c/a ratio of 1. 624, and a density of 1. 74 g/cm3 is1.6×〖10〗^(-8) cm.
The number of atoms that are present in each unit cell of a specific hexagonally closed-packed crystal with six atoms is known as hexagonal closed packing, or HPC. It is written as
ρ=(n×A)/(V_c×N_A )
Where
ρ is the density
n is the number of atoms
N_A is Avogadro’s constant (6.023×〖10〗^23 atoms/mol)
A is the molar mass of magnesium (24,305g/mol)
V_c is the volume of the crystal
V_c can be calculated using the expression below
V_c=(a^2 c×3√3)/2
a is the short crystal dimension (2R)
c is the long crystal dimension
1.624=c/a
c=1.624a
Putting the values in the above equation
V_c=(a^2×1.624a×3√3)/2
V_c=((2R)^2×1.624(2R)×3√3)/2
V_c=(4R^2×3.248R×3(1.73))/2
V_c=(67.428R^3)/2
V_c=33.71R^3 〖cm〗^3/(unit cell)
Substituting values into the density equation
ρ=(n×A)/(V_c×N_A )
1.74=(6×24.305)/(33.71R^3×6.023×〖10〗^23 )
Making R the subject of formula
R^3=145.83/(1.74×33.71×6.023×〖10〗^23 )
R^3=145.83/(3.53×〖10〗^25 )
R^3=4.127×〖10〗^(-24)
R=∛(4.127×〖10〗^(-24) )
R=1.6×〖10〗^(-8) cm
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If the pellets represent molecules of water, what do you think are the main differences among molecules of ice, water, and vapor?
Thanks
Answer:
Ice: solid and rigid. Water: Liquid and sloshy Gas: light and not dense.
Explanation:
Up ^
draw the structure of the two tertiary (3°) alcohols with the molecular formula c6h14o that contain only one ch3 group attached to the main carbon chain.
A square piece of paper has an edge measuring 7.06cm (using a centimeter ruler). How many significant figures should appear in the calculated surface area (A=S^2)?
The surface area of a square piece of paper has an edge measuring 7.06cm is 49.84 cm2
What is the surface area?The surface area of an object is the total area of the object that it occupies. It can be measured by adding all the sides of the object.
The surface area of a square is
side x side
Given the sides of the square is 7.06 cm.
This is a square, so all squares have the same size sides. So by putting the values in the equation, we can occupy the surface area of the square.
7.06 x 7.06 = 49.84
Therefore, the surface area of a square piece of paper is 49.84 cm2
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How many moles of N are in 0.171 g of N2O ?
Hi Steven!
So yet again, we find ourselves doing math when we thought the class was chemistry! For this we're going to do a standard conversion that we do a lot in GenChem, converting from grams to moles.
In this case, we're starting with 0.171g N2O. Let's go ahead and convert that to moles by using the molar mass, which is 44.013 g/mol.
.171 g N2O * (1 mol N2O / 44.013 g N2O) = 0.00389 mol N2O
So we got to moles of dinitrogen monoxide - now we need to know how many moles of nitrogen! We see that there's a subscript of 2 after the N, meaning there are two moles of N for every mol of N2O. You can think of it in terms of food -- for every 1 sandwich, there are two pieces of bread.
So let's multiply the number of moles of N2O by 2, to get moles of N!
.00389 mol N2O * ( 2 mol N / 1 mol N2O) = .00778 mol N!
Hope that helps :)
what type of properties can be used to separate mixtures?
Explanation:
physical separation technique are based on physical properties of the substance
Answer:
Physical properties
Explanation:
Mixtures can be physically separated by using methods that use differences PHYSICAL PROPERTIES(boiling point, melting point, solubility in a given solvent,etc) to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.
Calculate the number of grams of sulfuric acid in 1 gallon of battery acid if the solution has a density of 1.31 g/ml and is 38.5 % sulfuric acid by mass.
Using the density, the mass of sulfuric acid is 2292.82 grams.
We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as
ρ = m / V
where ρ is density, m is mass and V is volume
From the question above, we know that
ρ = 1.31 g/mL
V = 1 gallon = 4546.09 mL
% sulfuric acid = 38.5%
By substituting the following parameters, we get total mass
ρ = m / V
m = ρ .V
m = 1.31 . 4546.09
m = 5955.38 grams
Find the sulfuric acid mass
ms = %sulfuric acid x m
ms = 38.5% x 5955.38
ms = 2292.82 grams
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Which statement is a conclusion?
A.
How can cut flowers stay fresh for a longer period of time?
B.
Florists put cut flowers in sugar water, so flowers in sugar water stay fresh longer.
C.
Cut flowers placed in sugar water stay fresh longer than flowers placed in regular water.
D.
It's better to give people balloons than cut flowers that will die.
Answer:
C
Explanation:
A is a question
B is an opinion statement because it says "Florists put cut flowers in sugar longer, so flowers in sugar water stay fresh longer". When you can make a statement like that about anything.
C is a conclusion. It seems as if they already compared it and have came out with a 'conclusion'.
D. is an opinion.
HELP i think its true
A polyatomic ion is more than one type of element bonding to create a cation or an anion.
true or false
Answer:
It is true.
Explanation:
Its a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero
I am the halogen located in the fifth period of the periodic table.Who am I?
Big Pharm Drug Company is conducting research of their new drug Attendomax to improve the note-taking behavior of college students diagnosed with Attention Deficit Disorder. Fifty of the students receive capsules contain Attendomax, another fifty receive capsules which look the same but actually contain the drug Ritalin, which has been used for many years. All students attend the same series of lectures and have their notes collected afterward. Notes are scored for completeness and accuracy. Write down dependent and independent variables in the above case. What is the independant, dependant and control variables.
As per given statement as follows:-
independent variable: The independent variable is the type of drug given to students with Attention Deficit Disorder which is operationally defined as Atttendomax or Ritalin .Dependent variable: The dependent variable is the notes taken by the students which is measured the completeness and accuracyexperimental group is the one receiving Attendomaxcontrol group is the one receiving Ritalin, which is used for yearsgenerally, independent variables are the one manipulated by investigators and study effects. Dependent variables are the measurements and observation by the data collected.
Experimental group are the participants exposed to the independent variable and control group the participants treated same as experimental group but not exposed to independent variables.
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An atom of an element has 15 protons and 16 neutrons. What is its proton number?
What is its nucleon number?
Answer: 3
Nucleon number is 31
Explanation:
Explain the effect of temperature on oxygen production in the light when the temperature is increased from 40 degrees celsius to 50 degrees celsius
At medium temperatures, between 50 and 68 degrees Fahrenheit, or
10 and 20 degrees Celsius, the photosynthetic enzymes work at their
optimum levels, so photosynthesis rates gauge high.
Explain the effect of temperature on oxygen production :
The photosynthetic enzymes typically operate at their best levels between 50 and 68 degrees Fahrenheit, and any significant departure from this range would slow down photosynthesis.
Despite an increase in the rate of carbon dioxide absorption into leaves at temperatures above 68 degrees Fahrenheit (20 degrees Celsius), the rate of photosynthesis decreases at these temperatures because the enzymes are less effective.
The shape and functionality of the photosynthetic enzymes are lost at temperatures above 104 degrees Fahrenheit (40 degrees Celsius), and the photosynthetic rate rapidly decreases.
Due to the ineffectiveness of the photosynthetic enzymes at low temperatures, specifically between 32 and 50 degrees Fahrenheit (0 and 10 degrees Celsius), the rate of photosynthetic reaction decreases.
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When the temperature is moderate (between 50 and 68 degrees Fahrenheit), the photosynthetic enzymes function at their peak between 10 and 20 degrees and the photosynthesis rates measure at their highest points.
What is the effect of temperature on O2 production?As a result of the cells having to work harder to maintain a greater temperature, the amount of oxygen the cells require to function is also higher.
The temperature has an impact on photosynthesis's rate.
Photosynthesis occurs more quickly at higher temperatures. This is because the majority of chemical reactions are sped up by temperature and photosynthesis is a chemical reaction.
At 25C, oxygen synthesis is greatest. When the temperature is excessively high or low, oxygen generation decreases.
The negative connection between dissolved oxygen and temperature results in lower concentrations of dissolved oxygen.
Reduced dissolved oxygen levels occur as water temperature rises.
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A graduated cylinder has 22ml (cm3) of water placed in it. An irregularly shape object with a mass of 24g is then dropped in the graduated cylinder. If the volume of the graduated cylinder rises up to 30.0ml (cm3), what is the volume of the object
And what is the Density of the odject dropped in to the graduated cylinder.
The volume of the object is 8 cm³ and the density of the object is 3 g/cm³.
What is Archimedes' Principle?
Archimedes' principle states when an object is partially or fully immersed in a fluid, it displaces the portion of the fluid equal to its own weight.
The volume of the object = volume of the water in the cylinder displaced
volume of the object = 30 cm³ - 22 cm³
volume of the object = 8 cm³
Density of the objectThe density of the object is calculated from the ratio of the mass and volume of the object.
density = mass/volume
density of the object = 24 g / 8 cm³
density of the object = 3 g/cm³
Thus, the volume of the object is 8 cm³ and the density of the object is 3 g/cm³.
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place these in the correct order to represent photosynthesis
glucose (chemical energy)
carbon dioxide
oxygen
water
The correct order that depicts the process of photosynthesis would be carbon dioxide + water ---> glucose (chemical energy) + oxygen.
What is photosynthesis?
Photosynthesis is a biological process whereby green plants are able to make use of solar radiation to convert inorganic substances in the form of water and carbon dioxide to carbohydrates.
In addition to carbohydrates, oxygen gas is produced as a by-product of the process. The process happens through a series of chemical reactions. Some reactions require light while some do not.
The entire process is summarised by the following equation:
[tex]6CO_2 + 6H_2O --- > C_6H_1_2O_6 + 6O_2[/tex]
The equation can be rewritten in word form as:
carbon dioxide + water ---> glucose (chemical energy) + oxygen
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