What is 2+2 plzzzzz help I’m only 83

Answer:

omg

Explanation:

omg omg omg omg omg omg omg omg omg omg I can't either ehhhhhh

In a liquid sample of pure hexane, van-der wall forces( London dispersion force) attract hexane molecules to one another in the liquid sample of pure hexane.  

Intermolecular forces tend to hold the two atoms or molecules to each other. Though they hold the entity in a weak manner as compared to intermolecular bonds between atoms or molecules. Intermolecular forces are electrostatic in nature and hence they work well in polar molecules. As pure hexane is a organic liquid and a non polar one. Intermolecular forces that will work here will be weak in nature. Hence, vander-wall forces(London dispersion force) come into the picture. Hence, it's clear that due to non polar nature of pure hexane, vander-wall forces(London dispersion force) will work between the molecules of pure hexane and they will attract each other by this force.

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Answer:

The answer is 7

Explanation:

Guessed it

The expected diffraction angle for the first order reflection from the (113) set of planes for FCC platinum when monochromatic radiation of wavelength 0.1542 nm is used is 2Θ = 81.34⁰

Sets of plane = 113

The material = fcc platinum

Lambda L, = 0.1542

n = 1

Lambda = 2dsinΘ --------(1)

d = a/√h²+k²+l² -------(2)

the atomic radius is given as:

R = 0.1387nm

For FCC we have

a = 2R√2

= 2x0.1387x√2

= 0.3923nm

From the second equation

d111 = 0.3923nm/√1²+1²+3²

= 0.3923/√11

= 0.1183nm

From the first equation

0.1542 = 2x0.1183nmSinΘ

0.1542 = 0.2366sinΘ

SinΘ = 0.1542/0.2366

= 0.6517

Θ = Sin-1(0.6517)

= 40.67

2Θ = 81.34⁰

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Answer: A popular classroom demonstration involves placing a paper cup with water in it on a burner and boiling the water in the cup. Although part of the cup may burn, the part containing the water does not. This is because of the phenomenon of surface tension.

Surface tension is the force that causes the molecules at the surface of a liquid to be attracted to one another, creating a film of molecules across the surface of the liquid. This causes the water molecules to stick together and form a barrier against the heat of the flame, thus protecting the water from the heat.

The water molecules at the surface of the cup create a protective film, allowing the heat of the flame to be distributed evenly throughout the cup. This prevents the water in the cup from boiling and keeps it from burning.

The surface tension phenomenon can also be seen in other forms of liquids such as soaps and detergents. When these liquids are placed in a container and agitated, the molecules form a protective film over the surface of the liquid and prevent it from evaporating.

Surface tension is a fascinating phenomenon that can be seen in everyday life, and it can be used to explain why the paper cup does not burn when placed on a burner.

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The correct receptor pairing is acetylcholine with nicotinic receptors (ACh-nicotinic). Option A is correct.

Acetylcholine is a neurotransmitter that plays a crucial role in the nervous system. It is involved in various physiological processes, including muscle contraction, cognition, and memory.

Acetylcholine acts by binding to specific receptors called cholinergic receptors. There are two main types of cholinergic receptors: nicotinic receptors as well as muscarinic receptors.

Nicotinic receptors are ion channels that are activated by acetylcholine binding. They are named after nicotine because they can also be activated by nicotine, a compound found in tobacco. Nicotinic receptors are found in the central nervous system, autonomic ganglia, and neuromuscular junctions.

Norepinephrine is a different neurotransmitter that primarily binds to adrenergic receptors, which are a separate class of receptors. Norepinephrine does not typically bind to nicotinic receptors.

Hence, A. is the correct option.

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Answer:

bamboo is the biggest/tallest grass in the world

Answer:

Giant Bamboo

Explanation:

Giant bamboo, which can grow up to 151 feet tall, is the largest variety of grass.

The oxidation energy in terms of KkJ per carbon atom oxidized for glucose is 2.61 KkJ per carbon atom oxidized and the oxidation energy in terms of kJ/mol for palmitic acid is 9967.96 KkJ/mol

a. To calculate the oxidation energy in terms of KkJ per carbon atom oxidized for glucose, we need to first determine the number of carbon atoms in glucose. Glucose has 6 carbon atoms, so we can calculate the oxidation energy per carbon atom by dividing the total oxidation energy by the number of carbon atoms:

Oxidation energy per carbon atom of glucose = 15.64 KkJ/g / 6 carbon atoms
= 2.61 KkJ per carbon atom oxidized

b. To calculate the oxidation energy in terms of kJ/mol for palmitic acid, we need to first determine the molar mass of palmitic acid. Palmitic acid has a molar mass of 256.4 g/mol. We can calculate the oxidation energy per mole of palmitic acid by multiplying the total oxidation energy by the number of grams in a mole:

Oxidation energy per mole of palmitic acid = 38.90 KkJ/g x 256.4 g/mol
= 9967.96 KkJ/mol

Therefore, the oxidation energy in terms of KkJ per carbon atom oxidized for glucose is 2.61 KkJ per carbon atom oxidized and the oxidation energy in terms of kJ/mol for palmitic acid is 9967.96 KkJ/mol.

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Answer:

pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

a and e are heterogeneous (door and salsa), b, c, and d are homogeneous (air, black coffee, and pure water), and f cannot be classified as it pertains to a person rather than a substance or mixture. Option A and E

a. A door: Heterogeneous. A door is typically made up of various materials such as wood, metal, glass, etc. These materials have different properties and can be easily distinguished, making the door a heterogeneous object.

b. The air you breathe: Homogeneous. Air is a mixture of gases, primarily nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. On a macroscopic scale, air appears uniform and consistent throughout, making it a homogeneous mixture.

c. A cup of coffee (black): Homogeneous. A cup of black coffee consists of water and coffee solutes that are evenly distributed throughout the liquid. It appears uniform and consistent, indicating a homogeneous mixture.

d. The water you drink: Homogeneous. Pure water, without any dissolved substances or impurities, is a homogeneous substance. It is composed of H2O molecules that are uniformly distributed throughout the liquid.

e. Salsa: Heterogeneous. Salsa is a mixture of various ingredients such as tomatoes, onions, peppers, and spices. These ingredients have different textures, colors, and sizes. The different components can be visually distinguished, making salsa a heterogeneous mixture.

f. Your lab partner: Heterogeneous. A lab partner refers to a person, and individuals are not considered homogeneous or heterogeneous in the same sense as substances or mixtures. They are complex beings with different physical characteristics, thoughts, and behaviors. Thus, categorizing a lab partner as homogeneous or heterogeneous is not applicable in this context. Option A and E

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False. Using disinfectant chemicals can actually have a negative effect on the long term use of scissors and other sharp objects.

While disinfectants are great for killing germs and bacteria, they can also cause damage to the metal surfaces of scissors and other sharp objects, causing them to rust or corrode over time. This can ultimately lead to dull blades and a shorter lifespan for the tools. It's important to properly clean and disinfect scissors and other sharp objects, but it's equally important to be mindful of the chemicals used and to follow manufacturer's instructions for proper maintenance and care. To ensure the longevity of your scissors and other sharp objects, it's recommended to wipe them down with a mild disinfectant solution and to dry them thoroughly after each use. Additionally, storing them in a dry, clean place can also help to prevent damage.

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Answer:

I hope this photo can help you.

Answer:

C metallic bond is the answer

Answer:

insturement use to measure raingage

Answer:

The answer to this question is integumentary.

Explanation:

The answer is that because that is your skin area and so if you have a rash then if will affect that part.

It's b. integumentary

I got the test right

The total volume of gas produced by the complete decomposition of 1.44 kg k g of ammonium nitrate is 33.5 L.

The decomposition reaction of ammonium nitrate is given by:

NH4NO3(s) → N2(g) + 2H2O(g)

From the balanced chemical equation, we can see that 1 mole of ammonium nitrate produces 1 mole of nitrogen gas and 2 moles of water vapor. The molar mass of NH4NO3 is 80.04 g/mol, so 1.44 kg of NH4NO3 is equal to 18 moles.

To find the volume of gas produced, we can use the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperature from Celsius to Kelvin:

T = 127°C + 273.15 = 400.15 K

Next, we need to convert the pressure from mmHg to atm:

747 mmHg / 760 mmHg/atm = 0.981 atm

Now we can plug in the values and solve for V:

V = nRT/P = (1 mole N2)(0.08206 L·atm/mol·K)(400.15 K)/0.981 atm

= 33.5 L

Therefore, the total volume of gas produced by the complete decomposition of 1.44 kg of ammonium nitrate at 127°C and 747 mmHg is 33.5 L.

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The total volume of gas produced by the complete decomposition of 1.44 kg of ammonium nitrate at 127°C and 747 mmHg is 960.4 L.

Explanation: To solve this problem, we need to use the ideal gas law, PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. We can first find the number of moles of gas produced by calculating the amount of ammonium nitrate in moles (1.44 kg divided by the molar mass of NH4NO3), then multiplying by the stoichiometric ratio of gas produced per mole of ammonium nitrate (2 moles of gas per mole of NH4NO3).

Next, we can use the given temperature and pressure to convert the number of moles of gas into volume using the ideal gas law. It's important to note that the given temperature is in Celsius, so we need to convert it to Kelvin by adding 273.15. After plugging in the values and solving for V, we get a total volume of 960.4 L.

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Even if all other elements are at or close to the ideal range of tolerance, the limiting factor principle states that too much or too little of any physical or chemical factor can restrict or prevent population increase. Some species have a remarkable capacity for population growth.

Even when all other elements are at or close to their ideal levels, too much or too little of any physical or chemical factor might stop population increase. This ecological principle, what is it?

Food, water, habitat, and mates are the typical ecological limiting variables. The carrying capacity of an environment will depend on the accessibility of these elements. Demand for food increases along with population growth. Given the scarcity of food, organisms will start vying for it.

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If 150cm³ of carbon(11) oxide burns in 80cm³of oxygen according to the given equation the volume of oxygen that was in excess is 5.6 cm³.

From the balanced equation, we can see that 2 moles of CO react with 1 mole of O2. Therefore, we need to determine how much O2 is required to react with 150 cm³ of CO.

Let's start by calculating the number of moles of CO:

n(CO) = V(CO) / molar volume at STP

= 150 cm³ / 22.4 L/mol

= 0.006696 mol

Since the stoichiometric ratio of equation of CO to O2 is 2:1, we need half as many moles of O2 as CO. Therefore, the number of moles of O2 required is:

n(O2) = 1/2 * n(CO)

= 1/2 * 0.006696 mol

= 0.003348 mol

Now we can calculate the volume of oxygen required using the ideal gas law:

PV = nRT

Assuming the temperature and pressure are constant, we can simplify this to:

V = n(RT/P)

where V is the volume of gas in liters, n is the number of moles of gas, R is the ideal gas constant, T is the temperature in Kelvin, and P is the pressure in atmospheres.

At STP, the temperature is 273 K and the pressure is 1 atm. Therefore:

V(O2) = n(O2)(RT/P)

= 0.003348 mol * (0.0821 L·atm/mol·K * 273 K / 1 atm)

= 0.0744 L

= 74.4 cm³

So the volume of oxygen required to react with 150 cm³ of CO is 74.4 cm³. Since the initial volume of O2 was 80 cm³, the volume of O2 in excess is:

V(excess) = V(initial) - V(required)

= 80 cm³ - 74.4 cm³

= 5.6 cm³

Therefore, the volume of oxygen that was in excess is 5.6 cm³.

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Answer:

fingerprint!

Explanation:

sounds cooler, and it should have fewer people in the category, making a higher chance if placing if you do it.

Answer:

Fingerprint detections

Explanation:

I did this a few months ago and lemme tell you..........ITS SO FUN....SO you should do fingerprint detections.

Answer:

melting, freezing, sublimation, deposition, condensation, and vaporization. These changes

Explanation:

hope it helps...i dont know if its right but i hope it helps

Answer:

Refractive index

Heat capacity

Density

Explanation:

Properties that are used to identify materials are called intensive properties. These intensive properties are characteristic of the material and does not depend on the amount of material present.

Thus, if i want to identify whether the three bars are made of the same metal, i can look out for the following properties;

Refractive index

Heat capacity

Density

These properties are intensive properties thus they can be used to identify an unknown substance.

The concentration of Ce^{3+} is 0.0450 M in a solution with a volume of 50.00 mL.

The total volume of the solution is 100 mL.

We are asked to determine the concentration of Ce^{3+} in the resulting solution when 50.00 mL of the initial 0.0450 M Ce^{3+} solution is mixed with 50.00 mL of an unknown solution.

Without any information provided about the concentration or nature of the second solution, it is impossible to calculate the concentration of Ce^{3+} in the final mixture.

The concentration of Ce^{3+} in the resulting solution will depend on the concentration of Ce^{3+} in the second solution and the volumes of both solutions mixed.

The answer remains undefined until the concentration or information about the second solution is provided.

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The argon atoms make approximately 2.43 x 10^19 collisions with the given solid surface in 15 seconds.

First, we need to calculate the number of argon molecules in the given volume at the given pressure and temperature using the ideal gas law:

n = PV/RT

Converting the given dimensions to volume, we get:

\(V = (2.5 * 10^-3 m) * (3.0 * 10^-3 m) * (1 * 10^-9 m) = 7.5 * 10^{-14} m^3\)

Also:

\(P = 90 Pa \\T = 500 K\)

Using the values of R and T, we can calculate the number of molecules of argon:

\(n = (90 Pa * 7.5 * 10^{-14} m^3) / (8.314 J/(mol*K) * 500 K) = 3.24 * 10^{14}\)molecules

Next, we need to calculate the average speed : \(v = \sqrt {(3kT/m)\)

Using the atomic mass of argon and converting it to kilograms:

m = \(39.95 g/mol / 6.022 * 10^{23} mol^-1 / 1000 g/kg = 6.64 * 10^{-26} kg\)

Substituting given temperature and mass :

\(v = \sqrt {(3 * 1.38 * 10^{-23} J/K * 500 K / 6.64 * 10^{-26} kg) }= 500.2 m/s\)

Finally, we can calculate the number of collisions in 15 seconds:

Number of collisions = \(n * v * t = 3.24 * 10^14 * 500.2 * 15 = 2.43 * 10^{19\)collisions

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MALDI-TOF MS has certain advantages over ESI-MS viz.

(i) MALDI-TOF MS produces singly charged ions, thus interpretation of data is easy comparative to ESI-MS,

(ii) for analysis by ESI-MS, prior separation by chromatography is required which is not needed for MALDI-TOF MS analysis (Everley et al., 2008).

Matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry (MS) has become a widely used technique for the rapid and accurate identification of bacteria, mycobacteria and certain fungal pathogens in the clinical microbiology laboratory.

MALDI is the abbreviation for "Matrix Assisted Laser Desorption/Ionization." The sample for MALDI is uniformly mixed in a large quantity of matrix. The matrix absorbs the ultraviolet light (nitrogen laser light, wavelength 337 nm) and converts it to heat energy.

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Rutherford change our thinking about atomic structure by introducing the nuclear model of the atom.

J.J. Thompson presented the first structural model of the atom => 'Plumb Pudding' Model based on 'opposites attract'. The proposed model was a spherical positive field with negative particles (electrons) embedded throughout the volume, similar to plumbs suspended in gelatin pudding.

This paradigm was destroyed when E. Rutherford conducted the 'Gold Foil' Experiment, in which positively charged alpha particles were aimed at a thin gold leaf floating in a photosensitive chamber. If the Thompson model was right, the alpha particles would be deflected away from the gold atoms due to the hypothesised positive field. Yet, almost 99% of the alpha particles went through the gold foil unaffected.

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