how do the densities of crystalline and amorphous polymers of the same material that have identical molecular weights compare?

Answers

Answer 1

Answer: The density of a crystalline polymer is greater than an amorphous polymer of the same material and having the same molecular weight.Hope i help you! ❤️

Related Questions

Do the ingredients changing into a cake in the oven a chemical reaction?

Answers

Answer:

When you bake a cake, the ingredients go through a chemical change. A chemical change occurs when the molecules that compose two or more substances are rearranged to form a new substance! When you start baking, you have a mixture of ingredients. The flour, egg, sugar,

Explanation:

7. Balance the following reaction under basic conditions: Al (s) + Cr2O72- (aq) -> Al3+ (aq) + Cr3+ (aq)

8. What is the ^o of the following balanced redox reaction (use the reduction potentials provided in Table 11.1
below)?

Fe3+ (aq) + Au (s) -> Fe (s) + Au3+ (aq)

9. What is G for the reaction below – calculate it from the ^o ?

Fe (s) + Au3+ (aq) -> Fe3+ (aq) + Au (s)

Answers

The free energy change of the reaction; Fe (s) + Au3+ (aq) -> Fe3+ (aq) + Au (s) is calculated to be -443.83KJ/mol.

For the reaction shown in question 7, we can divide it into half equations as follows;

Oxidation half equation;

6 Al (s) -------> 6Al^3+(aq) + 18e

Reduction half equation;

3Cr2O7^2-(aq) + 42H^+(aq)   + 18e -----> 6Cr^3+(aq) + 21H2O(l)

The balanced reaction equation is;

6Al(s) + 3Cr2O7^2-(aq) + 42H^+(aq)   -----> 6Al^3+(aq) + 6Cr^3+(aq) + 21H2O(l)

The E° of this reaction is obtained from;

E° anode = -0.04 V

E°cathode = +1.50 V

E° cell = +1.50 V - (-0.04 V) = 1.54 V

Given that;

ΔG° = -nFE°cell

n = 3, F = 96500, E°cell = 1.54 V

ΔG° = -(3 × 96500 × 1.54)

ΔG° = -443.83KJ/mol

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How many moles of nitrogen dioxide, NO2, are present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L

Answers

There are 0.436 moles of nitrogen dioxide, NO2, present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L.

IDEAL GAS LAW:

The number of moles of nitrogen dioxide (NO2) in this question can be calculated by using the ideal gas law equation as follows:

PV = nRT

Where;

P = pressure (atm)V = volume (L)T = temperature (K)R = gas law constant (0.0821 Latm/molK)n = number of moles

According to the reaction conditions given in this question;

P = 2.46 atmV = 4.8Ln = ?T = 330K

2.46 × 4.8 = n × 0.0821 × 330

11.81 = 27.093n

n = 11.81 ÷ 27.093

n = 0.436mol

Therefore, there are 0.436 moles of nitrogen dioxide, NO2, present if the reaction conditions are 330 K, 2.46 atm, and 4.8 L.

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Don’t understand this science Question.

Answers

What is the question?

Answer:

I got you..you need help but with which question?

Explanation:

Have a great day!

How many atoms are in 2 moles of oxygen?

Answers

Answer:

6.02 × 1,023

Explanation:

One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1,023 molecules of oxygen but 12.04 X 1,023 (2 X 6.02 X 1,023) atoms, because each molecule of oxygen contains two oxygen atoms.

Which chemicals previously used in products such as refrigerants, aerosol sprays, and cleaning products contributed to the depletion of the ozone layer

Answers

Answer:chlorofluorocarbons (CFCs) could deplete Earth's atmospheric ozone layer, which blocks the sun's damaging ultraviolet rays. When the scientists reported their findings in 1974, CFCs were widely used as refrigerant gases and as propellants in aerosol sprays

Explanation:

How does a paper bag wrapped around a hot water bottle create convection?

Answers

How does a paper bag wrapped around a hot water bottle create convection?

Heat is a form of energy. You need energy to heat something up: for example, a cup of tea. To make your tea you probably use energy from electricity or gas. However, once your tea is hot, it won't stay hot forever. Just leave the cup of tea out on the table for a while, and you already know that it will become cooler the longer you wait. This is due to a phenomenon called heat transfer, which is the flow of energy in the form of heat. If two objects have different temperatures, heat automatically flows from one object to the other once they are in contact. The heat energy is transferred from the hotter to the colder object. In the case of the tea, the heat of the liquid is transferred to its surrounding air, which is usually colder than the tea. Once both objects reach the same temperature, the heat transfer will stop. Heat transfer via movement of fluids (liquids or gases) is called convection.




Want to keep warm this winter? Try this "cool" activity and find out what types of insulation work best--and why. Credit: George Retseck

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Key concepts
Physics
Heat transfer
Insulation
Material science
Introduction
What do you do when it gets very cold in winter? You probably turn your heater on, put on an extra layer of clothes or cuddle under a warm blanket. But have you ever thought about why a jacket helps you stay warm? Why are our clothes made from fabrics and not foils? Find out the answers in this activity; your results might even help you find the best way to stay warm in the cold!
Background
Heat is a form of energy. You need energy to heat something up: for example, a cup of tea. To make your tea you probably use energy from electricity or gas. However, once your tea is hot, it won't stay hot forever. Just leave the cup of tea out on the table for a while, and you already know that it will become cooler the longer you wait. This is due to a phenomenon called heat transfer, which is the flow of energy in the form of heat. If two objects have different temperatures, heat automatically flows from one object to the other once they are in contact. The heat energy is transferred from the hotter to the colder object. In the case of the tea, the heat of the liquid is transferred to its surrounding air, which is usually colder than the tea. Once both objects reach the same temperature, the heat transfer will stop. Heat transfer via movement of fluids (liquids or gases) is called convection.


Another type of heat transfer is conduction, in which energy moves through a substance (usually a solid) from one particle to another (unlike in convection where it’s the heated matter itself that moves). A pot handle getting hot would be an example of conduction.

Do solar panels use electrical energy or produce electrical?

Answers

Answer:

How Does a Solar Panel Generate Power? Solar panels use the photons produced by sunlight to generate direct current (DC) electricity. When the photons hit the panel they are absorbed by the panel's semiconducting silicon material.

Explanation:

Answer:

Solar panels produce electrical energy by absorbing the solar energy from the sun and converting it into electrical energy.

Explanation:

How many grams of potassium sulphate are formed when 49g of sulphuric acid in solution are neutralised by potassium hydroxide?

Answers

C - keep counting to the atoms

Synthetic fibers, like plastic, are derived from organic compounds. These fibers have been chemically changed by humans to last longer for better storage and more effective uses. These fibers are stronger than naturally occurring fibers like cotton and wool. Which of the following is a downside to these synthetic fibers when compared to natural fibers?
A.
The longer lasting material is more difficult to break down.
B.
The longer lasting material is less useful in manufacturing.
C.
The longer lasting material is not able to withstand high temperatures.
D.
The longer lasting material makes the fibers more expensive to buy.

Answers

The downside of this is that the longer lasting material is more difficult to break down.

Both natural fibers and synthetic fibers are polymer materials. Polymer materials are materials that are made by the agglomeration of small molecules called monomers.

The natural fibers are less long lasting than the synthetic fibers. The downside of this is that the longer lasting material is more difficult to break down. As a result of these, synthetic fibers lead to environmental pollution problems.

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Answer:

the longer lasting material is more difficult to break down.

Explanation:

Help me ASPAPPPPPPPPP

Answers

Answer:

Explanation:

1.  H2O

Lewis Dot:  

See the attachment.

Note the б+ and б- signs on the H and O atoms, respectively.  Those represent the slightly positive and slightly negative sides of the water molecule.  Those slight charges on a single water molecule are attracted to their opposite charges on neighboring H2O molecules, as shown in the graphic.  This interaction is what gives water it's cohesive properties.

3.  The property of cohesion describes the ability of water molecules to be attracted to other water molecules. which allows water to be a "sticky" liquid.

The hydrogen bonds are attractions of electrostatic force.  They arise due to the difference in charge between the slightly positive hydrogen ion and the slightly negative oxygen ion. Hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond, and it is what gives water it's cohesiveness, or ability to support water spiders, paper clips, and produces a loud noise in the event of a belly flop in a pool (including the yelp from the swimmer).

4.  I'm not sure what is being asked for the two blanks.  Water is polar and dissolves salts (ionic compounds) and hydrophilic molecules (water-loving molecules).

calculate the mass of sodium sample that it contains 2 Na atoms of sodium

please i need help with this ques. ​

Answers

Answer:

45.98 I believe if its wrong im sorry

can you help me with this

Answers

Answer:

I think it is A

Explanation:

if I am wrong I am so so so sorry

but i'm pretty sure I am right.

please let me know if I am right :)

A wave has wavelength of 10 m and a speed of 340 m/s. What is the frequency of the wave?

Answers

Answer:

The frequency of the wave is 34 Hertz

1. Atomic mass of 12 and 6 neutrons what is the atomic number?

Answers

Answer:

The atomic number would be 12.

Explanation:

A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons.

Which of the following methods of heat transfer causes the tectonic plates to move?

Conduction
Convection
Evaporation
Radiation

Answers

Convection. As Magma is a fluid.

When Brian first sorted out his thoughts, he figured this was the first day after the crash and what did he think would happen next?​

Answers

It should be noted that when Brian first sorted out his thoughts, the first thing that he thought would happen next is that he would probably be rescued that day.

It should be noted that in Chapter 5 of Hatchet, Brian wakes up in the forest and then, he realized that he was desperately thirsty.

When Brian first sorted out his thoughts, he figured this was the first day after the crash and that he would probably be rescued that day. He believed that he was going to wither up and die if he doesn't get anything that he'll drink.

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How to write a chemical formula ?​

Answers

Answer:

To write a chemical equation, the reactants should be written on the left, and the products should be written on the right and the coefficients should be written next to the symbols of entities to indicate the number of moles of a substance produced used in the chemical reaction.

The very act of you observing something
will disturb the system is known as:

Answers

Answer:

The observer effect is the answer.

RNA is a double strand. True or False?

Answers

Answer:

False, RNA is single stranded, DNA is double stranded and forms a double helix

Explanation:

How to get your crush to like you back

Answers

Make sure there’s “chemistry” between you two
answer:
i’m just going to say this…
if people stop talking to you, or seeing you it’s for a reason. things don’t happen on accident, so if your crush stopped liking you then it was for a reason wether you realize it or not.
hope this helps!

15. Which reaction produces a coloured substance?
A. The addition of sodium metal to water.
B. The addition of sulfur dioxide gas to water.
C. Burning sodium metal in chlorine gas.
D. The addition of chlorine gas to a solution of potassium iodide.

Answers

Answer:

the addition of chlorine gas to a solution of potassium iodide.

The reaction that produces a colored substance is the addition of chlorine gas to a solution of potassium iodide. The correct option is D.

What is a chemical reaction?

In a chemical reaction, reactants undergo a chemical reaction and transform into products through a chemical process. For instance, when humans breathe in oxygen, it combines with glucose to create carbon dioxide, water, and energy.

Another sign that a chemical reaction has taken place is a change in color. If two solutions are combined and a color change occurs that is not just the effect of diluting one of the reactant solutions, a reaction has taken place. A solid and a liquid combined may also result in a change in color.

Therefore, the correct option is D. The addition of chlorine gas to a solution of potassium iodide.

To learn more about chemical reactions, refer to the link:

https://brainly.com/question/22817140

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Is this soulution acidic or basic

Ph= 12

Basic

Acidic

Answers

Answer:

basic

Explanation:

ph>7 soits basic not acidic

Answer: A pH greater than 7 is basic

Explanation:

Because if you look at a ph scale the number 12 is apart of the alkaline part. if its apart of the alkaline park it mean it is not a basic acidic

Order the following elements according to the valence numbers from lowest to highest


1. Boron

2. Sodium

3. Chlorine

4. Beryllium

Answers

Sodium I hope this helps

How many moles of Iron (III) Oxide are found in 429 grams of Iron III Oxide?

Answers

Answer:

2.686485288205376 Explanation:

1 grams Iron(III) Oxide is equal to 0.0062622034690102 mole.

Write the chemical formulas and names for the following ionic compounds. Barium and phosphate 

Answers

Barium is Ba. Atomic no. 56 and atomic mass =137.3.

Phosphate is naturally occurring form of phosphorus. Phosphate is P. Atomin no. 15 and atomic mass =31.0.

mass is the gravitational pull on the earth
-tru
-fals
plz help

Answers

It is TRUE that mass is indeed the gravitational force that pulls on earth

Answer:

I believe the answer is false

Explanation:

Earth's gravity comes from all of its mass. All the mass makes a combined gravitational pull on all the mass in an object. If you were on a planet with less mass than Earth, you would weigh less than you do here. Mass is the quantity of matter in a physical body. It is also a measure of the body's inertia, the resistance to acceleration when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies. Mass is not the gravitational pull on the earth.

A student creates a hypothesis about their upcoming experiment. What must the
student do in their experiment with relationship to their hypothesis?
create a law based on the hypothesis
change the experiment to make the hypothesis correct
ignore the hypothesis
make observations to prove or disprove the hypothesis

Answers

Answer:

D. make observations to prove or disprove the hypothesis

Explanation:

The speed at which a chemical reaction proceeds is called

Answers

Answer:

Answer: Reaction Rate

Explanation:

reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

math! The concentration of a water and
alcohol solution is 25 percent alcohol by
volume. Calculate what the volume of alcohol
would be in 200 mL of the solution.

Answers

Answer:

50ml

Explanation:

The formula says that 25 percent of the solution is alcohol, so 200 x 0.25 equals to 50, or 50ml.

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1 of 131. Read the following passage from the beginning of "Rhinoceros."(1 point)We were sitting outside the cafe, my friend Jean and I, peacefully talking about onething and another, when we caught sight of it on the opposite pavement, huge andpowerful, panting noisily, charging straight ahead and brushing against market stalls-a rhinoceros. People in the street stepped hurriedly aside to let it pas. A housewifeuttered a cry of terror, her basket dropped from her hands, the wine from a brokenbottle spread over the pavement, and some pedestrians, one of them an elderly man,rushed into the shops. It was all over like a flash of lightning. People emerged fromtheir hiding places and gathered in groups which watched the rhinoceros disappearin the distance, made some comments on the incident and then dispersed.Which of the following stylistic elements is used by the writer to create humor in these lines?hyperboleincongruityironysarcasm PLS HELP Thanks to the Internet, most of the tools that fashion forecasters have are at your disposal. Search the Internet for recent fashion shows, which will indicate what is coming up next season. Look at recent fashion shows in major cities, such as New York and Los Angeles, to see where American fashion is headed. Then turn to Paris. You can look for fashion shows there as well as see what the major fashion magazines have on their websites in the European divisions. Fortunately, you dont need to read French to know what is highlighted in French fashion. Take a moment to check out Tokyo as well. Finally, check celebrity gossip magazine websites or magazines to see what celebrities are wearing around town and to formal events. When you are done, pick two trends that you expect to see in American stores next year. Finally, write a paragraph explaining the trend and what you found in your search that led you to believe that it is coming our way. 3 things that I have discovered about true freedom. 2 things that I can do in the service of my family and community as an expression of my love and proper use of my freedom. 1 Goal that I hope to accomplish this year that will significantly impact the community that I live in. in a concert hall, there are 16 chairs in the first row, and each row has 4 more chairs than the previous row. there are 14 rows altogether. how many chairs are there in the concert hall? 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In the second sentence of paragraph 1 (reproduced below), the writer is considering deleting the bolded text, adjusting the punctuation as necessary.Sympathy for the favorite nation, facilitating the illusion of an imaginary common interest in cases where no real common interest exists, and infusing into one the enmities of the other, betrays the former into a participation in the quarrels and wars of the latter without adequate inducement or justification.Should the writer keep or delete the bolded text?Group of answer choicesKeep it, because it emphasizes the writer's claim that there should be sympathy for these favorite nations.Keep it, because it clarifies the writer's key point that these common interests perceived by the nations are delusionary.Delete it, because it contradicts the writer's overall argument which is developed later in the speech.Delete it, because it simply repeats the meaning contained in the clauses which follow in the same sentence.4. 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