Which intermolecular force is primarily responsible for the different types of polyethylene? Explain.
Answers
Van der Waals intermolecular force is primarily responsible for different types of polyethylene.
Large number of polymer applications in different fields depend on their unique mechanical properties like tensile strength, elasticity, etc. These mechanical properties are governed by intermolecular forces like van der Waals forces present in the polymer.Polyethylene and its types belong to thermoplastic polymers.These are the linear or slightly branched long chain molecules capable of repeatedly softening on heating and hardening on cooling. Thermoplastic polymers possess intermolecular forces of attraction intermediate between elastomers (rubber like solids) which has weakest intermolecular forces and fibres (thread forming solids) which has strong intermolecular forces.Thus we can conclude that van der waals force or dispersion force is primarily responsible for different types of polyethylene.
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Related Questions
When an atom loses an electron, it becomes d. ionized. e. a plasma. a. dissociated. b. an isotope. c. sublimated.
Answers
Answer:
When an atom loses an electron it becomes ionized
Mercury melts at -39°C and boils at 356.9°C. What is its state at -20°C?
Answers
Answer:
At -20°C the mercury state will be liquid
Explanation:
The melting point of a substance is the temperature at which it changes from solid state to a liquid state, and the boiling point is the temperature at which it changes from liquid state to a gaseous state.
If mercury melts at -39°C and boils at 356.9°C, it means that if the temperature is lower than -39°C, mercury will remain al solid state. Between -39°C and 356.9°C, the state of mercury will be liquid and, above 356.9°C mercury will remain at gaseous state.
So, at -20°C the mercury state will be liquid, because that temperature it is between -39°C and 356.9°C.
In the Millikan oil droplet experiment, the oil is sprayed from an atomizer into a chamber. The droplets are allowed to pass through the hole into the chamber so that their fall can be observed. The top and bottom of the chamber consist of electrically charged plates. The upper plate is positively charged, and the lower plate is negatively charged. X rays are introduced into the chamber so that when they strike the oil droplets, the droplets will acquire one or more negative charges. The electric field (voltage) is applied to the metal plates.
Watch the animation and identify the effects of an electric field on the motion of a negatively charged oil droplet. Consider the gravitational force as Fg and the electric force as Fe. All the other forces acting on the oil droplet can be ignored as their effect on the motion of the oil droplet is negligible.
A/ In the absence of an electric field, the oil droplet falls freely due to the gravitational force.
B/ If Fe is increased until it is equal to Fg, the negatively charged oil droplet will remain stationary.
C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.
D/ In the presence of an electric field, the negatively charged oil droplet moves freely toward the negatively charged plate.
** I chose B, but that was the wrong answer
Answers
C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.
In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.
Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.
Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.
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Vaporization that takes place inside a liquid is called________.
Answers
Answer:
evaporation
Explanation:
Answer:
Boiling
Explanation:
When a substance transitions from liquid to gas, it's called evaporation if it's on the surface, and boiling if it's all throughout the liquid.
Picture boiling water in a pot: it starts on the bottom, and the bubbles go toward the top. Evaporation starts on the surface.
strong acids and bases belong to which class of chemical hazards?
Answers
These substances can burn the skin, eyes, and mucous membranes and can also cause respiratory issues, such as lung damage or asthma. Overall, strong acids and bases are hazardous chemicals that must be handled with extreme care to avoid injury and environmental damage.
Strong acids and bases belong to the class of chemical hazards. Strong acids and bases are corrosive materials, which means they can cause severe damage to living tissues, including skin and eyes. The potential severity of strong acids and bases makes them hazardous chemicals. An acid is a substance that donates a hydrogen ion (H+) to another substance, whereas a base accepts an H+ ion. When a strong acid is mixed with water, it will break down almost entirely, releasing H+ ions. Some examples of strong acids include sulfuric acid, hydrochloric acid, and nitric acid. These acids can cause severe burns and can even corrode metal. Bases are substances that produce OH- ions when they dissolve in water. Strong bases like sodium hydroxide and potassium hydroxide can be highly corrosive and can cause severe damage to tissues. These substances can burn the skin, eyes, and mucous membranes and can also cause respiratory issues, such as lung damage or asthma.Overall, strong acids and bases are hazardous chemicals that must be handled with extreme care to avoid injury and environmental damage.
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Provide a term that matches each description below.
a The agreement between several measurements of the same quantity
b Ratio between the mass and volume of a substance.
c In a series of measurements of the same quantity, one that is significantly different from the others.
d Mathematical value reported when a quantity is measured multiple times
e Term describing two liquids that do not mix together.
Answers
a. Consistency is a term that matches the description: The agreement between several measurements of the same quantity.
b. Density matches the description: Ratio between the mass and volume of a substance.
c. Outlier matches the description: In a series of measurements of the same quantity, one that is significantly different from the others.
d. Mean matches the description: Mathematical value reported when a quantity is measured multiple times.e. Immiscible is a term describing two liquids that do not mix together.
Definition: Immiscibility is the property of not being miscible. When two or more liquids are not able to form a homogeneous solution when combined, they are immiscible. The term "miscible" refers to the property of being mixed. Therefore, immiscible liquids cannot be mixed together or dissolved in one another.
Limiting reagent (also known as limiting reactant) is a chemical reaction term that refers to the substance that limits the quantity of product that can be formed in a chemical reaction. It is the substance that is entirely consumed first, preventing the other reactants from reacting further. The amount of product generated is determined by the quantity of the limiting reagent. In a chemical reaction, the quantity of the product produced is determined by the limiting reactant, and the rest of the excess reagents will remain unchanged.
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what is the colour of our oxygen
best answer will get 30 points
Answers
Answer:
colourless
Explanation:
although the gaseous form of oxygen is colourless
when it liquefies it turns into a blue fluid.
hope this helps:)
What is the mass of a lead block that has a volume of 30 mL?
O 3.39 grams
O .377 mL
O 265 mL
O 339 grams
Answers
Answer:
d
Explanation:
i think it's d, but I'm not sure. my answer is a little different but maybe i used a different number for the density of lead (11.35g/cc)
Which parts of atoms can interact (react) to form chemical bonds? valence electrons protons the nucleus of each atom the orbitals
Answers
The valence electrons are the components of atoms that can interact or react to form chemical bonds.
These are the electrons located in the outermost energy level or shell of an atom.
They participate in chemical bonding and decide an element's reactivity and chemical characteristics.
Each atom's nucleus and protons are not directly involved in the formation of chemical bonds. On the other side, orbitals are areas of an atom where electrons are most likely to be present, but they don't interact or react with one another to create chemical bonds.
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A high altitiude balloon contains 30.0 L of He gas at 103kPa. What is the volume when the balloon rises to an altitiude where the pressure is only 25.0kPa? Assume the temp is constant. (BOYLES LAW) 15 points pls help
Answers
124 L is the correct answer
Thus, the volume of the helium is 124 L when the balloon rises to an altitude where the pressure is only 25 kPa.
What is temperature ?
Temperature is a measure of the thermal energy of a substance or system. It reflects the degree of hotness or coldness of a material, and is a crucial parameter in many physical and biological systems. It is usually measured in units of kelvins, Celsius, or Fahrenheit. The Kelvin scale is an absolute temperature scale, where 0 K represents absolute zero, the temperature at which all matter has no thermal energy. The Celsius and Fahrenheit scales are relative temperature scales, with 0°C and 32°F defined as the freezing point of water and 100°C and 212°F defined as the boiling point of water.
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4. In what period can you find Nitrogen on the periodic table?
Answers
Is Mg2+ An element, subatomic particle, ion or a molecule?
Answers
Mg2+ is an ion. Magnesium, abbreviated as Mg, is a chemical element with the atomic number 12 and the symbol Mg.
Magnesium is a metal, and it is the eighth most abundant element in the earth's crust. Magnesium ions, such as Mg2+, are created by the loss of two electrons by the magnesium atom. Mg2+ is an ion. An ion is a particle that has an electric charge (positive or negative) that is not neutral. Magnesium ion (Mg2+) is a positively charged ion, which means it has two electrons less than the total number of electrons in a neutral magnesium atom.
The Mg2+ ion is formed when the neutral magnesium atom loses two electrons. In an ionic bond, the Mg2+ ion tends to combine with other ions that have a negative charge, such as oxygen.
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Part E
Study the trend of the graph from part C. What would the reaction time be (in seconds) if the water were cooled to
5°C?
Answers
According to the information of the graph we can infer that if the water were cooled to 5°C the reaction time would be close to 30 seconds.
What would the reaction time be if the water were cooled to 5°C?To establish what would the reaction time be if the water were cooled to 5°C we have to analyze the information of the graph specially the trend. In this case, we have to take into account where are located the point that relate time and temperature.
In this case, the trend is more time with less temperature. So if the water were colled to 5°C, the time would be close to 30 seconds.
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Question 1 0 Which of the following numerical expressions gives the number of moles in 5.0 g of CaO?
A) 5.0 g X 56 g/mol
B) 5.0 g / 56 g/mol
C) 56 g/mol / 5.0 g
D) 1/5.0 g X 1/56 g/mol
Answers
Answer: A
Explanation:
5.0 g / 56 g/mol is the numerical expression that gives the number of moles in 5.0 g of CaO.
HOW TO FIND NUMBER OF MOLES:
The number of moles in a substance can be calculated by dividing the mass of that substance in grams by its molar mass in grams/moles. Number of moles = mass ÷ molar massIn this question, 5.0g of calcium oxide (CaO) was given. The molar mass of CaO is as follows:CaO = 40g/mol + 16g/mol = 56g/mol
Number of moles = 5.0g ÷ 56g/mol
Therefore, 5.0 g / 56 g/mol is the numerical expression that gives the number of moles in 5.0 g of CaO.
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50 POINTS pls answer the full thing<333 i will report if you don't (will mark barinliest)
Some greenhouse gases, such as fluorocarbons (CFCs, HFCs, PFCs, etc.), are human-made. Others, such as water, methane, and carbon dioxide, are naturally produced. Which type of greenhouse gas (human-made or natural) is more difficult to control and eliminate? Which types are easier? In three to five sentences, provide evidence for your argument.(4 points)
Wetlands are able to remove nutrients and chemicals from water as the water flows through the area. A developer is planning to destroy most of the wetlands near a bay. In three to five sentences, explain how destroying the wetlands would impact the bay’s water quality and ecosystem.(4 points)
Commercial agriculture can often lead to water-quality problems. In one to two sentences, explain how two of those problems occur.(2 points)
Answers
Destroying the wetlands would result in a significant decline in the bay's water quality and ecosystem. Wetlands are natural filters that remove nutrients and chemicals from water as it flows through the area. By destroying the wetlands, the water quality of the bay would decline as pollutants and chemicals would no longer be filtered out. This would have a significant impact on the bay's ecosystem, as many species rely on the bay's water quality to survive.
Two water-quality problems that can arise from commercial agriculture are eutrophication and contamination from pesticides and fertilizers. Eutrophication is the process by which excess nutrients enter a body of water, leading to the growth of algae and other aquatic plants. This can lead to a depletion of oxygen in the water, which can harm aquatic life. Pesticides and fertilizers used in commercial agriculture can also contaminate water sources, leading to health problems for humans and animals that rely on the water.
The ion that controls the widest variety of intracellular activities is __________.
A) potassium
B) sodium
C) chloride
D) calcium
Answers
Answer:
D)Calcium
Hope it help and is this the master A&P chapter 6?
Select the reactions below that are elementary reactions as written. Select all that apply. Incorrect choices will be penalized. 2 NO(g) + 2 H2(g) → N2(g) + 2 H₂O(g) Rate = K[NO]²[H₂)²2 2 NO(g) + O2(g) → 2 NO2(g) Rate = K[NO₂]²[0₂] NO2(g) + CO(g) → CO2(g) + NO(g) Rate = k[NO₂]² 2 NO₂(g) 1 NO3(g) + NO(g) Rate = k[NO₂)²
Answers
The elementary reactions in the given set are: \(2 NO(g) + 2 H_2(g)\) → \(N_2(g) + 2 H_2O(g)\), \(2 NO(g) + O_2(g)\) → \(2 NO_2(g), NO_2(g) + CO(g)\)→ \(CO_2(g) + NO(g)\).
Elementary reactions are individual reactions that cannot be further broken down into simpler steps. In the given set, the first reaction involving the combination of 2 NO molecules with\(2 H_2\) molecules to form \(N_2\) and \(2 H_2O\) satisfies the definition of an elementary reaction.
Similarly, the second reaction where 2 NO molecules react with \(O_2\) to produce 2 \(NO_2\) also qualifies as an elementary reaction. Finally, the third reaction where\(NO_2\) reacts with CO to yield \(CO_2\)and NO is another example of an elementary reaction. These reactions directly involve the reactant molecules without any intermediates or multiple steps.
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what kind of change is heating of mercuric oxide?
Answers
Answer:
Chemical change.
Explanation:
When it is heated it decomposes into mercury and oxygen gas. The mercury oxide reactant becomes the silver color of mercury. Hence, a color change can be noticed throughout the reaction.
Answer:
chemical change
Explanation:
An atom of 105In has a mass of 104.914558 amu.
mass of1H atom = 1.007825 amu
mass of a neutron = 1.008665 amu
Calculate the mass defect (deficit) in amu/atom.
In atomic #= 49
Answers
The mass defect (deficit) in amu/atom is 0.109879 amu/atom of an atom of 105In has a mass of 104.914558 amu.
The mass of an atom is the sum of the masses of its protons, neutrons, and electrons.
The mass of an atom is generally less than the sum of the masses of its subatomic particles.
The difference between the sum of the masses of its protons, neutrons, and electrons and the mass of an atom is
known as the mass defect.
Mass defect = [(Z × mp + N × mn) − M]
where, Z = the atomic number; N = the number of neutrons; mp = mass of proton; mn = mass of neutron; and M = mass of nucleus.
In this case, mass defect = [(49 × 1.007825 + 56 × 1.008665) − 104.914558] amu/atom = 0.109879 amu/atom.
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8. Look at the following electronic configurations of elements and predict which element has the highest electron affinity? Explain your answer. [ /3A]
a. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4
b. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5
c. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
d. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1
e. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
Answers
Answer:
e, beacause that is the higher voltage
Explanation:
calculate
Which of these statements relating to ecological succession is true?
During succession, there is no change to the physical or chemical environment.
During succession, existing species resist interaction with new species.
During succession, new species move into an area and colonize it.
Most ecological successions occur over 10 to 15 years.
Answers
Answer: During succession, new species move into an area and colonize it.
Explanation: Ecological succession refers to the process of change in the composition and structure of an ecosystem over time. It occurs due to the interactions between the biotic (living) and abiotic (non-living) components of an environment. As succession progresses, new species gradually establish and thrive in the area, leading to a change in the species composition. This process can occur over a long period of time, ranging from decades to centuries, depending on various factors such as environmental conditions and the specific type of succession.
PLEASE HELPPPP! :{
Leandra is performing an investigation. She places one strawberry by the window in the sunlight and another strawberry inside of the refrigerator. Leandra leaves the strawberries for three weeks and observes them. After the three weeks, what observation did Leandra make?
A. The strawberry in the refrigerator rusted faster because it was exposed to less heat.
B. The strawberry by the window rusted faster because it was exposed to more heat.
C. The strawberry in the refrigerator rotted faster because it was exposed to less heat.
D. The strawberry by the window rotted faster because it was exposed to more heat.
Answers
the cowardly lion and the hungry tiger objective
Answers
Answer:
It is one of the six Little Wizard Stories of Oz. The Cowardly Lion and the Hungry Tiger have grown bored with their guard duty at Ozma's throne in the Royal Palace of the Emerald City. The Lion wants to attack a man and make "chop suey of him." The Tiger longs, at last, to satisfy his hunger for a fat baby.
Explanation:
i hope this help u
Which of these elements is the most chemically reactive?
A zinc (Zn)
B. iron (Fe)
C. potassium (K)
D. germanium (Ge)
Answers
Answer:
a zinc is the most reactive
Which of these is an example of science that helps technology?
recycling bottles
designing a microscope
studying how magnets work
building a bridge
No lies please
Answers
Answer:
Answer number 2
Explanation:
Designing a microscope
(p.s. idc about getting whatever brainliest is)
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
If you start with 4.50 grams of Magnesium (Mg), how many grams of Hydrogen gas (H2) will you theoretically...
Answers
Answer:
Explanation:
So you should obtain 0.1875 moles of H2 The theoretical yield of H2, in grams, can be found by multiplying the 0.1875 moles by the molar mass of H2 (2 grams/mole). We would expect, and love to find, 0.37g in our possession.
Choose the TRUE statement
To condense steam the temperature must decrease.
There is more energy in steam at 100°C than water at 100ºC
To melt ice the temperature must increase.
iron can only exist as a solid
Answers
Answer:
The true statement is: "There is more energy in steam at 100°C than water at 100ºC."
This is because steam at 100°C has more thermal energy than water at 100ºC because it has undergone a phase change from liquid to gas, which requires additional energy.
The other statements are not true:
To condense steam, the temperature must increase, not decrease. Condensation is the process by which a gas (steam) changes phase to a liquid, and this requires the removal of energy, usually through cooling.
To melt ice, the temperature must increase. Melting is the process by which a solid (ice) changes phase to a liquid, and this requires the addition of energy, usually through heating.
Iron can exist in all three states of matter (solid, liquid, and gas) depending on the temperature and pressure. However, at room temperature and standard atmospheric pressure, iron is a solid.
Explanation:
Which of the following elements is the most reactive?
A. At
B.Cl
C.I
D.Br
Answers
Answer:
B. Cl.
Explanation:
These are Group 7 elements whose reactivity reduces as you go down the group. Chlorine has a smaller atoms than the rest and has a stronger tendency to grab an electron in its valency shell. This is because its nucleus is closer to the outer electrons than the other elements.
PLEASE HELP
Fossil fuels are burnt in power plants to produce electricity. Which one of the
following sequences show the correct order of energy transformation?
Answers
Answer:
a
Explanation:
Chemical then thermal because the carbon emissions produce heat
Then kinetic because there is energy transfer then electric because that's the finished result
Elisa’s diabetes causes her to have lower than normal numbers of glucose molecules in her cells. You already wrote about how this makes her tiredNow, write an explanation that answers the question How could Elisa's diabetes also affect her body’s ability to grow and repair cellsDiabetes could affect how well Elisa's cells can grow and repair themselves. Word Bank
glucose
oxygen
cellular respiration
amino acid
protein
energy
Answers
Yes, it affects the body’s ability to grow and repair cells.
As insulin is a hormone that turns glucose into energy for cellular functions through the process of cellular respiration, the blood glucose level rises when insulin is not produced in sufficient amounts or cells are unable to use the insulin.
The increased blood glucose levels impede the healing of wounds or prevent them from healing or repairing. In such a diabetic case, a small foot wound can grow into a foot ulcer very quickly. When blood sugar levels are high, blood vessels stiffen or constrict, slowing the flow of oxygen through the body in diabetics.
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