suppose you mix 100.0 g of water at 24.2 oc with 75.0 g of water at 78.7 oc. what will be the final temperature of the mixed water, in oc?

The main intermolecular forces that act between a water molecule and a hydrogen peroxide (H2O2) molecule are hydrogen bonding and dipole-dipole interactions.

Hydrogen bonding occurs between the hydrogen atom in the water molecule and the oxygen atom in the H2O2 molecule. This is because both molecules have polar covalent bonds, which result in partial charges on their atoms.

Hydrogen bonding is a type of dipole-dipole interaction, which occurs between two molecules with permanent dipoles. The oxygen atom in the water molecule is partially negative, while the hydrogen atoms are partially positive, creating a dipole.

The oxygen atoms in the H2O2 molecule are also partially negative, resulting in another dipole. These dipoles interact, leading to dipole-dipole interactions. These intermolecular forces help to hold the water and H2O2 molecules together, enabling them to mix and interact with each other.

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Answer:

Chromosomes threads of DNA that make up a twisty, coiled shape. DNA strands carry genes, and traits are influenced by the genes that people get from their biological parents.

Explanation:

I got this from goggle ...

Isotopes undergo radioactive decay because thermodynamics generally governs the situation. Every atom strives to have the greatest degree of stability. When the number of protons and neutrons in the atomic nucleus is out of balance, instability results in radioactive decay. In essence, the nucleus contains too much energy to keep all the nucleons together.

Radioactive decay a the spontaneous process through which an unstable atomic nucleus breaks into smaller, more stable fragments.

Three Types of Radioactive Decay:

Alpha Decay:

       When an alpha particle basically a helium nucleus with two protons and two neutrons is ejected, the parent's atomic number and mass number are reduced by two and four, respectively.

Beta Decay:

      A stream of electrons from the parent, known as beta particles, is released during beta decay, and a neutron in the nucleus is changed into a proton. The new nucleus has the same mass number, but an additional atomic number of one.

Gamma Decay:

        The atomic nucleus releases extra energy during gamma decay in the form of high-energy photons (electromagnetic radiation). The resultant nucleus takes on a more stable energy state while maintaining the same atomic number and mass number.

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Answer:

Explanation:

  3BaBr₂       +       2Na₃PO₄     =       6BaBr + Ba₃(PO₄)₂ (s)

3 x 297 = 891 gm                                          1 x 602 = 602 gm

891 gram of BaBr₂ yields     602 gram of precipitate

15.2 gram of BaBr₂ yields     602 x 15.2 / 891 gram of precipitate

= 10.23 gram

actual yield = 9.5 gram

percent yield = 9.5 x 100 / 10.23

= 92.86 % .

The pH of the base solution after adding 213.6 mL of the HNO₃ solution is approximately 1.66.

To calculate the pH of the base solution after adding the HNO₃ solution, we need to consider the reaction between dimethylamine (CH₃NH₂) and HNO₃. The reaction can be represented as:

CH₃NH₂ + HNO₃→ CH₃NH³⁺ + NO³⁻

The initial moles of dimethylamine (CH₃NH₂) can be calculated using the initial concentration and volume:

moles CH₃NH₂ = initial concentration CH₃NH₂ × initial volume CH₃NH₂

moles CH₃NH₂ = 0.6300 M × 99.2 mL

Next, we need to determine the limiting reagent in the reaction. To do that, we calculate the moles of HNO₃ that react with dimethylamine:

moles HNO₃ = HNO₃ concentration × volume of HNO₃ added

moles HNO₃= 0.2500 M × 213.6 mL

Since the stoichiometry of the reaction is 1:1 between CH₃NH₂ and HNO₃, the limiting reagent will be the one with fewer moles.

Now, we can calculate the moles of dimethylamine remaining after the reaction:

moles CH₃NH₂ remaining = initial moles CH₃NH₂ - moles HNO₃ reacted

Next, we calculate the concentration of dimethylamine in the final solution:

final concentration CH₃NH₂ = moles CH₃NH₂ remaining / final volume

The final volume is the sum of the initial volume of the solution and the volume of HNO₃ added.

Finally, we can calculate the pOH and convert it to pH using the relation pH + pOH = 14:

pOH = -log10 [OH-]

pH = 14 - pOH

Given that pKa of dimethylamine (CH₃NH₂) is 3.27, we know that at equilibrium, the concentration of CH₃NH₂ equals the concentration of CH₃NH³⁺.

Let's perform the calculations:

Initial moles of CH₃NH₂:

moles CH₃NH₂ = 0.6300 M × 99.2 mL = 62.544 moles

Moles of HNO₃ reacted:

moles HNO₃ = 0.2500 M * 213.6 mL = 53.4 moles

Moles of CH₃NH₂ remaining:

moles CH₃NH₂ remaining = 62.544 - 53.4 = 9.144 moles

Final volume:

final volume = initial volume + volume of HNO₃  added = 99.2 mL + 213.6 mL = 312.8 mL

Final concentration of CH₃NH₂:

final concentration CH₃NH₂ = 9.144 moles / 312.8 mL = 0.0292 M

pOH = -log10 [OH-]

pOH = -log10 (Kw / [H₃O+])

pOH = -log10 (10⁻¹⁴ / [H₃O+])

pOH = 14 + log10 [H₃O+]

From the pKa, we know that [CH₃NH³⁺] = [CH₃NH₂], so [H₃O+] = [CH₃NH₂] = 0.0292 M.

pOH = 14 + log10 (0.0292)

pOH = 12.34

pH = 14 - pOH

pH = 14 - 12.34

pH ≈ 1.66

Therefore, the pH of the base solution after adding 213.6 mL of the HNO₃ solution is approximately 1.66.

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Force and gravity work together with simple objects exert an equal attractive force

Gravity or gravitational force is the force of attraction between any two objects in the universe and the force of attraction depends on the mass of the object and the square of the distance between them and it is by far the weakest known force in nature the size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases and both objects exert an equal attractive force on each other and falling object is attracting the earth with the same size force as the earth is attracting it

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Arrangement from lowest to highest entropy will be CuO (s) < H₂O (l) < H₂O₂ (l) < H₂O (g)

The dispersed energy of any system is called the entropy of the system. In simple words, this energy cannot be used to perform any activity. As we know that the highest degree of randomness is present in gasses because gas molecules move in the system in a random manner. The degree of randomness is slightly lower in liquids than in gasses because liquid molecules have different forces like hydrogen bonding dipole forces etc. These forces maintain the degree of randomness. In solid substances, the molecules remain in a fixed position so the degree of randomness is almost zero.

So among the given molecules, H₂O has the highest entropy and CuO has the lowest. if Two molecules have the same phase then we will decide according to the molecular formula.

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As substances travel from the small intestines to the large intestine, the H+ ion concentration would increase. This is because the pH of a solution is determined by the concentration of H+ ions. A lower pH indicates a higher concentration of H+ ions, while a higher pH indicates a lower concentration of H+ ions.

In this case, the pH of the small intestines is 7.5, which suggests a lower concentration of H+ ions compared to the pH of 5.5 in the large intestine. The decrease in pH from the small intestines to the large intestine indicates an increase in the concentration of H+ ions.

The change in pH along the digestive tract is primarily due to the secretion and absorption of various substances in different regions. The large intestine, for example, contains bacteria that can produce acids as byproducts of their metabolism, leading to a lower pH.

Overall, the transition from the small intestines to the large intestine results in an increase in the H+ ion concentration, leading to a lower pH in the large intestine compared to the small intestines.

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One factor that does not lead to long-run economic growth is excessive government regulations and interventions in the economy.

Excessive government regulations and interventions in the economy hinder long-run economic growth. When the government imposes numerous regulations and interventions, it can create barriers and inefficiencies that impede business activities and innovation. Excessive regulations can lead to increased compliance costs for businesses, limiting their ability to invest in research and development, expand operations, or hire new employees. Additionally, interventions such as price controls or excessive taxation can discourage investment and entrepreneurship, as they reduce the potential returns on these activities. In such a constrained environment, businesses may be less inclined to take risks and explore new opportunities, which can stifle innovation and productivity growth, ultimately hindering long-run economic growth.

To promote long-run economic growth, it is important for governments to strike a balance between necessary regulations for protecting public interest and ensuring a conducive environment for businesses and entrepreneurs to thrive. A competitive and market-oriented economy with appropriate regulations that foster fair competition, protect property rights, and encourage innovation is more likely to promote sustainable economic growth in the long term.

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Compared to carbon nanotube, carbon nanofiber (CNF) is a unique quasi-one-dimensional nanostructure with a lot of edges and flaws (CNT). Additionally, their low cost and wide availability make them a valuable nanomaterial for upcoming technology.

In accordance with the semiconductor material's piezo resistive effect, diffusion resistance is used to manufacture piezo resistive sensors on substrates of semiconductor materials. The diffusion resistor is connected in the substrate in the form of a bridge, allowing the substrate to be employed directly as a measuring sensor element.

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Answer:

Vibrate?

Explanation:

In a solid the strong attractions between the particles hold them tightly packed together. Even though they are vibrating this is not enough to disrupt the structure. When a solid is heated the particles gain energy and start to vibrate faster and faster.

the value of the rate constant at 227°C,is option c) 1.5 x 10^11 s^-1..

The Arrhenius equation is given by k = Ae^(-Ea/RT), where k is the rate constant, A is the frequency factor, Ea is the activation energy, R is the universal gas constant, and T is the temperature in Kelvin.

Given that A = 2.2 x 10^13 s^-1, Ea = 150 kJ mol^-1, and the temperature T = 227°C + 273.15 = 500.15 K, we can calculate the value of the rate constant as

follows:k = Ae^(-Ea/RT) = (2.2 x 10^13 s^-1)e^(-150000 J mol^-1 / (8.314 J K^-1 mol^-1)(500.15 K)) = 1.5 x 10^11 s^-1Therefore, the answer is option c) 1.5 x 10^11 s^-1.

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The balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

Given equation: 3O2+4Co⟶2Co2O3Using the symbol e− for an electron. The redox reaction can be broken down into two half-reactions. The reduction half-reaction is the one in which a species gains electrons and the oxidation half-reaction is the one in which a species loses electrons. The half-reactions are as follows: Reduction Half-reaction Half-reaction equation: O2 + 2e- → 2O2 -Oxidation number of oxygen in O2=0 and in O2^-= -1Charge on the left side = 0Charge on the right side = 2 x (-1) = -2Thus, 2 electrons are added to the left side to balance the charge, making the half-reaction:O2 + 2e- → 2O2 -Oxidation Half-reaction Half-reaction equation: 4Co → 4Co2+ + 8e-Oxidation number of cobalt in Co=0 and in Co2+ =+2Charge on the left side = 0Charge on the right side = 4 x (+2) + 8 x (-1) = -4Thus, 8 electrons are added to the right side to balance the charge, making the half-reaction:4Co → 4Co2+ + 8e-Thus, the balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

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If Half- life of an isotope is 30 days and it was assumed that the person ate 100 Bq of isotope, there are 50 transformations in the stomach.

The radioactive decay of a sample of an isotope can be characterized by the half-life of that isotope. When a radioisotope undergoes decay, its nucleus becomes unstable, and it emits particles or energy to become more stable. The half-life of an isotope is the time it takes for half of the original sample to decay. The question states that the half-life of an isotope is 30 days, and the person ingested 100 Bq of isotope. It also says to calculate the number of transformations in the stomach using GI track model information .

Since the isotope has a half-life of 30 days, we can use the following formula to find the number of transformations in the stomach:` N = N₀ (1/2)^(t/T₁/₂)`where: N₀ = initial number of nuclei N = final number of nuclei (after time t)T₁/₂ = half-life of the isotope The isotope has a half-life of 30 days, so T₁/₂ = 30 days. The question doesn't specify how long the person has had the isotope in their stomach, so we'll assume it's been there for one half-life, or 30 days. Therefore, t = 30 days.

Substituting into the formula:` N = 100 (1/2)^(30/30)`Simplifying:` N = 100 (1/2)^1`Evaluating:`N = 50`So after 30 days in the stomach, the person would have 50 Bq of the isotope left. Therefore, the number of transformations in the stomach is the difference between the initial number of transformations (100 Bq) and the final number of transformations (50 Bq):`Number of transformations in stomach = 100 - 50 = 50 transformations. Therefore, there are 50 transformations in the stomach.

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Answer:

Li + Cl₂

Explanation:

left side of the arrow are reactants and right side of the arrow are products.

Answer:

22 626 000 J. = 22 626 kJ. 4. If 9000 J of heat are absorbed by 800 g of water at 5.0 o. C, what maximum temperature will the water attain? Q = mc ∆T.

Explanation:

The final temperature can be calculated using the calorimetric equation. Here, the final temperature of water is 27.71 °C.

The calorimetric equation connecting the heat energy absorbed or released q by a system with the mass m, temperature difference ΔT and the specific heat capacity c as follows:

q = m c ΔT

The specific heat capacity of water = 4.15 J/ °C g.

given that heat energy absorbed q = 9000 J

mass = 800 g

initial temperature = 25 °C.

Then,

9000 J = 4.15 J/ °C g. × 800 g (25 °C + T)

then T = [ 9000 J/  4.15 J/ °C g. × 800 g ] + 25 °C = 27.71  °C.

Therefore, the final temperature of water is 27.71  °C.

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Answer:

The correct answer is

Explanation:

hope this helps u!!

The role of each section and the direction and type of transport of Na+ (sodium) and H2O (water) in the different sections,
1. Renal Corpuscle (Glomerulus and Bowman's Capsule)

2. Proximal Convoluted Tubule (PCT)

3. Loop of Henle

4. Distal Convoluted Tubule (DCT)

5. Collecting Duct

1. Renal Corpuscle (Glomerulus and Bowman's Capsule): Filtration occurs here as blood enters the glomerulus under high pressure. Small molecules such as water, electrolytes, glucose, and amino acids are passively filtered out of the glomerular capillaries into Bowman's capsule. Both Na+ and H2O are filtered out of the blood.

2. Proximal Convoluted Tubule (PCT): Reabsorption occurs in this section. Na+ is actively transported out of the tubule and into the surrounding interstitial fluid through active transport mechanisms. This creates an osmotic gradient, leading to the passive reabsorption of water. Thus, both Na+ and H2O move from the tubule into the interstitial fluid.

3. Loop of Henle: The loop consists of a descending limb and an ascending limb. In the descending limb, water moves out of the tubule passively due to the high osmolarity of the medullary interstitium. In the ascending limb, Na+ is actively transported out of the tubule, while water remains impermeable. This creates a diluting segment, leading to the excretion of dilute urine.

4. Distal Convoluted Tubule (DCT): Further fine-tuning of reabsorption occurs here. Na+ is actively transported out of the tubule, and water can follow passively depending on the body's hydration status and hormonal control. The movement of Na+ and water can be regulated by hormones like aldosterone and antidiuretic hormone (ADH).

5. Collecting Duct: The final adjustments of urine concentration take place in the collecting duct. Na+ can be actively reabsorbed or secreted depending on the body's needs, while water movement is regulated by ADH. ADH increases water permeability, allowing for water reabsorption and concentration of urine.

Overall, Na+ is actively transported out of the tubule in the proximal tubule, ascending limb of the loop of Henle, and distal tubule, while water movement can be both passive and regulated by hormonal control. The direction and type of transport of Na+ and H2O vary depending on the specific section of the nephron and the body's physiological requirements.

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Answer:

Force arrows are used to represent both the magnitude and direction of forces. The length of the arrow corresponds to the magnitude of the force, with longer arrows indicating forces with larger magnitudes. :) hope this helps

Explanation:

Answer:

induced draft blower

Explanation:

quizlet

Normal Concentration = 18.09 moles/L Standard Deviation = 1.89 moles/L

The capacity for sustained attention on a single thing, activity, or work without being sidetracked is known as concentration. It is the key to success in most endeavors, as it requires a person to ignore any extraneous thoughts, feelings, or stimuli and instead focus on the task at hand. Concentration is a mental skill that can be developed and improved with practice, such as with mindfulness, meditation, and various cognitive exercises. Concentration can also be adversely affected by poor physical health, lack of sleep, and stress, so it is important to maintain a healthy lifestyle if one wants to stay focused.
Student | Weight (g) | Volume (L) | Concentration (moles/L)
1 | 5.0 | 0.25 | 19.82
2 | 8.0 | 0.50 | 15.89
3 | 4.0 | 0.20 | 20.23
4 | 7.0 | 0.30 | 18.52
5 | 6.0 | 0.40 | 16.96

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The statement "covalent bonds form when an electron is completely lost or gained from an atom" is not true about covalent bonds.

Covalent bonds occur when atoms share electrons to complete their valence shells, rather than completely losing or gaining electrons. This sharing allows atoms to achieve stability by fulfilling the octet rule. In a single covalent bond, a pair of electrons is shared between two atoms, represented by a line between them.

A covalent molecule consists of one or more covalent bonds. The incorrect statement describes an ionic bond, which forms through the complete transfer of electrons from one atom to another, creating oppositely charged ions that are attracted to each other.

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This means that the sodium bicarbonate in this experiment is the Excess reactant.

These are the elements or compounds which are involved in a chemical reaction and react to form the products.

The reactants were sodium bicarbonate and acetic acid with small amounts of the former being  unreacted at the bottom of the beaker means it's anm excess reactant.

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NaCl > NaBr > NaF The higher the charge and size of the ions that make up an ionic compound, the higher the melting point.

Electrostatic forces are forces of attraction or repulsion that act between objects that have static electric charges. These forces are created when electrons are either transferred or shared between two objects. Electrostatic forces can be very strong, even though the charges involved are typically very small.

NaCl has the highest charge and size, so it will have the highest melting point. NaBr has a slightly lower charge and size than NaCl, so it will have a lower melting point. Finally, NaF has the lowest charge and size of the three, so it will have the lowest melting point.

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Under pressure, oxygen is contained in oxygen cylinders, and as the cylinder is used down, the pressure gauge steadily decreases.

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Answer:

\(5850\ \text{cal}\)

Explanation:

m = Mass of water = 4500 g

c = Specific heat of water = \(1\ \text{cal/g}^{\circ}\text{C}\)

\(\Delta T\) = Change in temperature of water = \(1.3^{\circ}\text{C}\)

Heat is given by

\(q=mc\Delta T\\\Rightarrow q=4500\times 1\times 1.3\\\Rightarrow q=5850\ \text{cal}\)

A slice of the bread contains \(5850\ \text{cal}\).

Answer:

It is Noble-gas notation

Explanation:

Just did it on Edgenuity 2020

Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, the given electronic configuration represents noble-gas notation​.

Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.

The systematic distribution of electrons in the various atomic orbitals is called its electronic configuration. The atomic number of argon is 18. The electronic configuration of argon is (Ne) 3s² 3p⁶. 1,2,3 represents the number of shells and s and represents the orbitals. The superscripts represents the number of electrons in each orbitals. The given electronic configuration represents  noble-gas notation​.

Therefore, the given electronic configuration represents noble-gas notation​.

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The volume of a 25.2 g piece of metal with a density of 8.75 g/cm³ is approximately 2.88 cm³. Density is a measure of how much mass is contained in a given volume.

The formula for density is density = mass/volume. In this case, the mass is given as 25.2 g, and the density is 8.75 g/cm³. To find the volume, we rearrange the formula as volume = mass/density.

Substituting the known values, we get volume = 25.2 g / 8.75 g/cm³. The units of grams in the numerator and denominator cancel out, leaving us with cm³ as the unit for volume. Calculating the division, we find that the volume of the metal is approximately 2.88 cm³.

This means that 25.2 grams of this metal would occupy a volume of 2.88 cubic centimeters.

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Answer: 16 Nm

Explanation: Work is measured as Force times Displacement . Therefore , 160N X 0.1m = 16 Nm