1. Define the two parts of the word polymer, and give a literal definition of polymer.
2. Describe two properties of polymers that depend on their long-chain structure.
3. Name three items that consist of or contain polymers.

If, a 24.0% of a sample of radioisotope decays in 8.73 s. Then, the half-life of this isotope will be -22.07 s.

To determine the half-life of the radioisotope, we can use the decay constant (λ), which is related to the half-life (T) through the following equation;

λ = ln(2) / T

where; λ = decay constant

T = half-life

Given; Decay percentage = 24.0%

Time = 8.73 s

First, we need to calculate the decay constant (λ) using the decay percentage;

Decay constant (λ) = -ln(1 - (decay percentage / 100)) / Time

λ = -ln(1 - (24.0 / 100)) / 8.73 s

Next, we can calculate the half-life (T) using the decay constant.

T = ln(2) / λ

T = ln(2) / (-ln(1 - (24.0 / 100)) / 8.73 s)

Simplifying further;

T ≈ ln(2) × 8.73 s / ln(1 - 0.24)

T ≈ 0.693 × 8.73 s / ln(0.76)

T ≈ 6.04989 s / (-0.27443)

T ≈ -22.07 s

Therefore, the half-life will be -22.07 s.

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the pH of a 0.10 M solution of the triprotic acid H3A is approximately 1.84. So the correct answer: d

Let's assume that x moles of H+ ions are released in the first dissociation reaction. Then, the equilibrium concentrations of the species would be:

[\(H_3A\)] = (0.10 mol/L) - x

[\(H_2A^-\)] = x

[\(HA2^-\)] = 0 (since the second dissociation constant is much smaller than the first, the amount of \(HA_2^-\) formed is negligible compared to the amount of \(H_2A\)- formed)

Next, let's write the equilibrium constant expression for the first dissociation reaction:

Ka1 = \([H^+][H_2A^-]/[H_3A]\)

We can assume that x is small compared to the initial concentration of H3A, so we can simplify the expression as follows:

Ka1 = \(x^2\)/(0.10-x)

Using the quadratic formula, we can solve for x:

x = 5.79 × \(10^{-3\) M

Now we can calculate the pH of the solution:

pH = -log[\(H^+\)]

[\(H^+\)] = x + [\(H_2A^-\)] = 5.79 × \(10^{-3\) M + 0.10 M = 0.10579 M

pH = -log(0.10579) = 1.98

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To create an electron dot diagram first identify the element the diagram is about and then use dots around the symbol of the element to represent the electrons.

Each atom includes three main sub-particles: protons, neutrons, and electrons. In regular atoms, the number of protons is equal to the number of electrons.

Moreover, it is common to represent the number of electrons using Lewis structure also known as dot diagram. To create a dot diagram follow these steps:

Note: This question is incomplete because the elements for the diagram are not provided; due to this, I answered this question based on general knowledge.

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The rate of reaction of calcium carbonate with hydrochloric acid likely depends on the concentration of hydrochloric acid, surface area of calcium carbonate, temperature, and the presence of a catalyst.

The rate of reaction of calcium carbonate (chalk) with hydrochloric acid likely depends on the following factors:

1. Concentration of hydrochloric acid: Higher concentrations of hydrochloric acid generally result in a faster reaction rate.

2. Surface area of calcium carbonate: Finely powdered calcium carbonate provides more surface area for the reaction, leading to a faster reaction rate compared to larger pieces or chunks.

3. Temperature: Higher temperatures increase the kinetic energy of the reactant particles, causing them to move faster and collide more frequently, resulting in a faster reaction rate.

4. Presence of a catalyst: The addition of a catalyst can increase the rate of the reaction by providing an alternative reaction pathway with lower activation energy.

Therefore, the rate of reaction of calcium carbonate with hydrochloric acid likely depends on the concentration of hydrochloric acid, surface area of calcium carbonate, temperature, and the presence of a catalyst. These factors influence the frequency of collisions and the energy available for successful collisions, affecting the rate at which the reaction occurs.

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Answer:

Physical Properties of Hafnium Hafnium is a shiny and silvery metal exhibiting ductile features. It is usually resistant to corrosion and exhibits similar chemical properties to that of zirconium.

Atomic Mass: 178.49 g.mol −

1Atomic Number: 72Symbol: Hf

Answer:

yes

Explanation:

For the encapsulation of pharmaceutical drugs or pesticides, the use of starch-borate and starch-glycerol polymers is a promising strategy that can increase their efficacy while also lowering their environmental impact.

\Starch-borate and starch-glycerol polymers are biodegradable and environmentally friendly materials that have been used for encapsulation of pharmaceutical drugs or pesticides. When drugs or pesticides are encapsulated within these polymers, it can help to improve their solubility, stability, and bioavailability, which are critical factors in their effectiveness.

The starch-borate and starch-glycerol polymers are able to form a protective coating around the drug or pesticide molecules, shielding them from external factors that may degrade or reduce their effectiveness, such as moisture, oxygen, and light. This can help to prolong their shelf-life and ensure that they remain effective for longer periods of time.

In addition, these polymers are biodegradable, meaning they can be broken down naturally in the environment without causing harm. This is beneficial as it reduces the environmental impact of these materials, compared to traditional polymers that can persist in the environment for hundreds of years. Overall, the use of starch-borate and starch-glycerol polymers for encapsulation of pharmaceutical drugs or pesticides is a promising approach that can improve their effectiveness while also reducing their environmental impact.

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Answer:

319

Explanation:

The molecular mass of C3H18 can be found by adding up the molecular weights of carbon and hydrogen so, (12.01 x 3) For Carbon and (1.008x18) for hydrogen. You will find it is 54.174g/mol.

To find grams muliply g/mol by mols so 5.9 x 54.174= 319 i didnt see any errors with my math so maybe you clicked 8 by accident but i may just be wrong

Answer:

see below (I hope this helps!)

Explanation:

You are a student, therefore, the people who are the same "rank" as you are your fellow students, this makes them your peers.

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

Standard temperature and pressure (STP) conditions of 0°C and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol.

1. Helium seems to have a molar mass of 4.00 g/mol.

Therefore, we can calculate the number of moles of helium as:

moles of He = mass of He divided by molar mass of He

= 2.50 g / 4.00 g/mol

= 0.625 mol

Then, we can use the molar volume of a gas at STP to calculate the volume of helium gas:

volume of He = moles of He x molar volume of gas at STP

= 0.625 mol x 22.4 L/mol

= 14.0 L

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

2. The molar mass of sodium is 22.99 g/mol. Therefore, we can calculate the number of moles of sodium as:

moles of Na = number of atoms of Na divided by Avogadro's number

= 5.0 x 10²⁵ atoms / 6.022 x 10²³ atoms/mol

= 83.0 mol

Then, we can use the molar mass of sodium to calculate the mass of sodium:

mass of Na = moles of Na x molar mass of Na

= 83.0 mol x 22.99 g/mol

= 1900 g

Therefore, 5.0 x 10²⁵ atoms of sodium have a mass of 1900 g.

3. The molar mass of Ni is 58.69 g/mol. Therefore, we can calculate the number of moles of Ni as:

moles of Ni = mass of Ni divided by molar mass of Ni

= 3.95 g / 58.69 g/mol

= 0.0673 mol

Then, we can use Avogadro's number to calculate the number of atoms of Ni:

number of atoms of Ni = moles of Ni x Avogadro's number

= 0.0673 mol x 6.022 x 10²³ atoms/mol

= 4.05 x 10²² atoms

Therefore, 3.95 g of Ni contain 4.05 x 10²² atoms.

4. The molar mass of Xe is 131.29 g/mol. Therefore, we can calculate the number of moles of Xe as:

moles of Xe = mass of Xe divided by molar mass of Xe

= 15 kg / 131.29 g/mol

= 114 mol

Then, we can use Avogadro's number to calculate the number of atoms of Xe:

number of atoms of Xe = moles of Xe x Avogadro's number

= 114 mol x 6.022 x 10^23 atoms/mol

= 6.87 x10²⁵ atoms

Therefore, a 15 kg sample of Xe gas contains 6.87 x 10²⁵ atoms.

5. A gas's molar volume at STP is 22.4 L/mol. Therefore, we can calculate the number of moles of Ar as:

moles of Ar = number of atoms of Ar divided by Avogadro's number

= 45,000,000 atoms / 6.022 x 10²³ atoms/mol

= 7.47 x 10⁻¹⁷ mol

Then, we can use the molar volume of a gas at STP to calculate the volume of Ar gas:

volume of Ar = moles of Ar x molar volume of gas at STP

= 7.47 x 10⁻¹⁷ mol x 22.4 L/mol

= 1.67 x  10⁻¹⁵ L

Therefore, 45,000,000 atoms of Ar would occupy a volume of 1.67 x 10⁻¹⁵ liters at STP.

6. The molar mass of CO₂ is 44.01 g/mol. Therefore, we can calculate the number of moles of CO₂ as:

moles of CO₂ = mass of CO₂ divided by molar mass of CO₂

= 75 g / 44.01 g/mol

= 1.70 mol

Then, we can use Avogadro's number to calculate the number of atoms of CO₂:

number of atoms of CO₂ = moles of CO₂ x Avogadro's number

= 1.70 mol x 6.022 x 10²³ atoms/mol

= 1.02 x 10²⁴ atoms

Therefore, a 75 g sample of CO₂ contains 1.02 x 10²⁴ atoms.

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Answer: The limiting ingredient is cheddar cheese. You only have 3 slices and that is not enough to make 4 sandwiches. Therefore, cheddar cheese is the limiting ingredient as you cannot make any more sandwiches without it.

P.S Please hit like button.

Answer:

mayonaise

Explanation:

From the balanced redox equation of the reaction, the coefficient of OH⁻ is 8.

A redox equation is the equation of a redox reaction in which oxidation and reduction occurs simultaneously.

The given redox reaction takes place in a basic solution

The balanced redox equation of the reaction is given below:

4 H₂O(l) + 3 S²⁻(aq) + 2 NO₃⁻(aq) ---> 3 S(s) + 2 NO + 8 OH⁻(aq)

In conclusion, a redox equation is balanced when oxidation and reduction occur to the same extent.

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Biosignatures are chemical and physical indicators that can only be produced by life. The search for biosignatures on other planets is a key focus in the search for extraterrestrial life. A wide range of biosignatures have been identified, including the presence of specific chemical compounds, isotopic ratios, and physical structures such as microfossils.

Out of the options provided, the presence of carbon dioxide in the atmosphere (option a) would not be considered a biosignature, as it can be produced by both biological and non-biological processes. Carbon dioxide is a common component of planetary atmospheres and can be produced by geological activity as well as by biological processes such as respiration and photosynthesis.

In contrast, the other options provided are all potential biosignatures. For example, the presence of insoluble manganese oxides (option b) has been suggested as a potential indicator of microbial activity, as certain bacteria are known to produce these minerals. The decreased 12C/13C isotopic ratio (option c) can also be a biosignature, as some forms of life preferentially use certain isotopes of carbon, leading to distinctive isotopic ratios in their environment. Similarly, homochirality of certain molecules (option d) is a potential biosignature, as this phenomenon is thought to be a consequence of life's chemistry.

Overall, the search for biosignatures is an exciting area of research that has the potential to provide evidence of extraterrestrial life. By identifying distinctive chemical and physical indicators that can only be produced by living organisms, scientists can begin to explore the possibility of life beyond our own planet.

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Answer:

The sugar will dissolve in water.

The oil will float in water.

Explanation:

The sugar molecules will fill up the remaining space between the molecules of water.

The oil being lighter and less denser than water floats in the water.

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Answer:

To name an ionic compound, you simply need to find the names  of the cation and anion present in the compound and make sure to revise the ends of metal names as needed. First, write out the name of the metal, followed by the name of the non-metal with its new ending.

Explanation:

Write the name of the cation, and then write the name of the anion, changing the ending to "-ide" if it's a single element and leaving it as it is if it's a polyatomic ion.

The chlorine curve is a graphical representation of the relationship between the concentration of chlorine in water and the amount of time it has been in contact with that water. The curve typically has three distinct regions: the initial or breakpoint region, the plateau region, and the overdosing region. Each of these regions has different characteristics and implications for water treatment.

The initial or breakpoint region is where the chlorine reacts with organic and inorganic compounds in the water, breaking them down and forming new compounds. This region is characterized by a rapid decrease in chlorine concentration and the formation of a measurable residual.
The plateau region is where the majority of the disinfection occurs. Chlorine concentration is relatively stable, and there is a consistent residual present. The residual in this region is typically measured and used to monitor the effectiveness of the disinfection process.
The overdosing region is where the chlorine concentration exceeds the demand for disinfection. Chlorine is present in excess, and the residual can be quite high. This region is typically avoided in water treatment, as excessive chlorine levels can be harmful to consumers.
The strongest, most aggressive form of chlorine is found in the initial or breakpoint region of the chlorine curve. This is because the chlorine is reacting with contaminants in the water, using up the chlorine rapidly and forming new, more reactive compounds. As the chlorine progresses through the curve and reaches the plateau region, it becomes less reactive and forms a more stable residual.
In conclusion, understanding the chlorine curve and where to measure residual chlorine levels is critical in ensuring safe drinking water. The breakpoint region of the curve is where the most aggressive form of chlorine is found, and monitoring chlorine levels in the plateau region is important in maintaining an effective disinfection process.

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The chlorine curve is a graphical representation of the relationship between the concentration of chlorine in water and the time it takes for that chlorine to disinfect the water. It is used to determine the appropriate amount of chlorine to add to water in order to achieve a desired level of disinfection.

The measurable residual refers to the amount of chlorine that remains in the water after the disinfection process is complete. This residual is important because it ensures that the water remains free from harmful microorganisms as it moves through the distribution system. The chlorine curve has three distinct locations where a measurable residual can be detected: the breakpoint, the peak, and the tail. The breakpoint is where all of the chlorine has reacted with the organic and inorganic matter in the water and is no longer effective. The peak is where the highest concentration of chlorine is found and where the most aggressive form of chlorine is located. The tail is where the residual chlorine gradually decreases as it continues to react with any remaining organic and inorganic matter in the water. Therefore, the answer to the question is that the strongest, most aggressive form of chlorine is found on the peak portion of the chlorine curve. This is where the highest concentration of chlorine is located and where the disinfection process is most effective. However, it is important to note that excessive amounts of chlorine can be harmful to human health and may result in taste and odor issues in the water. Thus, it is crucial to maintain the appropriate residual chlorine level for safe and effective disinfection.

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Discovering the effect of caffeine on heart rate. The Independent Variable is caffeine, dependent Variable is heart beat, Control is group given no caffeine and constant is same amount of caffeine.

Independent variable is defined as varible which is changed by the experimenter.

Dependent variable is defined as those variable which depends on the independent variable.

It is defined as that group which do not receive experimental treatment.

It is that variable which is kept unchanged for all types of groups in the experiment.

Thus, we concluded that the the Independent Variable is caffeine, dependent Variable is heart beat, Control is group given no caffeine and constant is same amount of caffeine.

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To determine the molarity of the hydrochloric acid (HCl) and the number of grams of HCl in the solution, we can use the principles of stoichiometry and the balanced chemical equation for the reaction between barium hydroxide (Ba(OH)2) and hydrochloric acid (HCl):

Ba(OH)2 + 2HCl → BaCl2 + 2H2O

a) Molarity of the acid (HCl):

From the balanced equation, we can see that one mole of Ba(OH)2 reacts with two moles of HCl. Therefore, the moles of HCl can be calculated as follows:

Moles of HCl = Moles of Ba(OH)2 = Molarity of Ba(OH)2 × Volume of Ba(OH)2 solution in liters

Moles of HCl = 0.145 M × (34.7 mL / 1000 mL/L) = 0.00504 moles

Since the volume of HCl is not specified, we cannot directly calculate the molarity of the acid. We need additional information, such as the volume of HCl used or the balanced equation stoichiometry.

b) Grams of HCl:

To calculate the grams of HCl, we need the molar mass of HCl. The molar mass of HCl is approximately 36.46 g/mol.

Grams of HCl = Moles of HCl × Molar mass of HCl

Grams of HCl = 0.00504 moles × 36.46 g/mol = 0.184 grams

Therefore,

a) The molarity of the hydrochloric acid (HCl) is not provided in the given information. Additional information is needed to calculate it.

b) The solution contains approximately 0.184 grams of HCl.

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The reaction between 2-methyl-2-pentanol and sulfuric acid to yield 2-methyl-2-pentene goes via an elimination reaction

Elimination reactions are those that proceed by the removal of one or more atoms or functional groups from the reactants, resulting in the formation of a new double bond or π bond in a product. An example of an elimination reaction is the dehydration of alcohols.In this particular reaction, 2-methyl-2-pentanol (an alcohol) reacts with sulfuric acid to produce 2-methyl-2-pentene, which is an alkene.

The reaction mechanism proceeds via an elimination reaction, where the OH group and a hydrogen ion (H+) are removed from the reactant, resulting in the formation of a double bond between the adjacent carbon atoms in the product.The reaction can be represented as follows:CH3C(CH3)2CH(OH)CH3 + H2SO4 → CH3C(CH3)2C=CH2 + H2O + H2SO4In conclusion, the reaction between 2-methyl-2-pentanol and sulfuric acid to yield 2-methyl-2-pentene goes via an elimination reaction.

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Answer:

VELOCITY

Explanation:

VELOCITY IS THE SPEED AND DIRECTION OF MOVEMENT

Explanation:

velocity

reason: The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).

Answer:

the answer is  3747.84

Explanation:

Answer:

1/....

Explanation:

If we say acceleration 'a' is inversely proportional to mass 'm', then

a=1/m.

A better explanation of these systems is given using molecular orbital theory.

The valence bond theory hold that a  bond is formed by the sharing of two electron in a covalent bond. This bond does not account for certain systems that occur in multiple bonded systems where the simple two electron bonding model does not suffice.

Thus, valence bond theory is inadequate for describing systems with multiple adjacent  bonds that overlap, as in aromatic molecules. a better explanation of these systems is given using molecular orbital theory.

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The options that are correct are;

A. Readers can compare relative amounts of each type of renewable energy.

C. Readers get a quick visual on how each type of renewable energy contributes to the whole

One may quickly grasp how each source contributes to the energy consumption that is renewable and how efficient each one is by looking at the pie chart with each stated percentage consumption of each renewable energy source.

The largest percentage, for instance, is 48% for biomass. We may imagine biomass as being the most dominating renewable energy source and one which will have the biggest relative amount of renewable energy used compared to the others, even though we don't know the precise amount consumed in kilojoules.

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Answer:

D

Explanation: