Please help meee 25 points and please dont guess

Reflecting telescopes are preferred for scientific research because they are better suited for gathering large amounts of light and producing high-quality images. However, refracting telescopes are still popular for amateur astronomers and for viewing objects on Earth.

Reflecting telescopes are different from refracting telescopes because reflecting telescopes use mirrors, whereas refracting telescopes use lenses. The reflecting telescope was invented in 1668 by Sir Isaac Newton, and it has since become one of the most popular types of telescopes.
Reflecting telescopes use a mirror to gather and focus light, while refracting telescopes use a lens to do the same thing. Reflecting telescopes can be made much larger than refracting telescopes because it is easier to make large mirrors than it is to make large lenses. The mirror in a reflecting telescope is placed at the back of the telescope, and it gathers and reflects light back to a secondary mirror, which then reflects the light to the eyepiece. The eyepiece is where the observer looks through the telescope.In contrast, the lens in a refracting telescope is placed at the front of the telescope, and it gathers and bends light as it passes through. The lens focuses the light onto an eyepiece at the back of the telescope. Refracting telescopes are generally smaller than reflecting telescopes because of the difficulty of making large lenses.
Another difference between reflecting and refracting telescopes is the way they are constructed. Reflecting telescopes have a simple tube that houses the mirrors and eyepiece, while refracting telescopes have a more complex design with a long tube that contains the lens and eyepiece.

for such more questions on telescopes

https://brainly.com/question/28359353

#SPJ8

1.68g of phosphorus were burned to form 3.87g of phosphorus oxide, Then the empirical formula is  P₂O₅.

Molecular formula = P₄O₆

Mass of one mole of oxide Molar mass = 4 * 31 + 6 * 16

= 124 + 96

= 220 g/mol

Molar mass of Phosphorus = 31 g/mol

Molar mass of Oxygen = 16g/mol

wp = 1.68g

Moles(Phosphorus) = 1.68 / 31 = 0.054

wo = 3.87 - 1.68

= 2.19

Moles(Oxygen) = 2.19/16

= 0.138

P : O

0.054 : 0.1368

0.054/0.054 : 0.1368/0.054

1 : 2.5

1 * 2 : 2.5*3

2 : 5

Emperical formula : P₂O₅

To know more about Emperical formula check the below link:

https://brainly.com/question/28116165

#SPJ1

Answer:

Both oil and gasoline molecules are nonpolar, while water is polar. Nonpolar solvents have a tendency to dissolve other nonpolar molecules.

Explanation:

Molecules may be categorized as "polar" or "nonpolar" according to difference in the atom's electronegativity.

Water is polar because it consists of two types of atoms that do not cancel out each other. It is made of two atoms of Hydrogen and only one atom of Oxygen. This makes the Oxygen partially negative and the Hydrogen partially positive. This allows them to readily bond with other polar molecules like sugar. However, it cannot mix freely with oil and gasoline because both of these are nonpolar. Nonpolar molecules do not have much difference when it comes to their atoms' electronegativity. Therefore, they have the tendency to dissolve molecules which are nonpolar as well. This explains why oil molecules can mix freely with gasoline.

The reaction between benzene and isobutyl chloride in the presence of AlCl3 is an example of Friedel-Crafts alkylation. In this reaction, the AlCl3 acts as a Lewis acid catalyst, facilitating the formation of a carbocation intermediate.

1. The benzene molecule, which is an aromatic compound, undergoes electrophilic substitution. The AlCl3 catalyst binds to the isobutyl chloride, forming a complex.The chloride ion (Cl-) is then removed from the isobutyl chloride, resulting in the formation of a carbocation (C6H5CH2+).

3. The carbocation reacts with the benzene molecule, where one of the hydrogen atoms on the benzene ring is replaced by the isobutyl group It's important to note that the reaction is conducted in excess benzene. This means that there is an excess amount of benzene compared to isobutyl chloride. The excess benzene ensures that the reaction is driven towards the formation of the desired product.

To know more about that benzene visit:

https://brainly.com/question/31837011

#SPJ11

The question is incomplete, the complete question is;

Each sentence describes potential and kinetic energy at various locations on a slide. Complete each statement by selecting the position of the object on the slide.

An object at position has all kinetic energy. A B or C

An object at position has all potential energy. A B or C

An object at position has about half potential energy and half kinetic energy. A B or C

Answer:

An object at position C has all kinetic energy.

An object at position A has all potential energy.

An object at position B has about half potential energy and half kinetic energy.

Explanation:

Lets take a good look at the image.

At position A, the object is stationary and we know that the energy possessed by an an object by virtue of its position is known as potential energy. Hence at A, the energy possessed by the body is all potential.

At position B, the total mechanical energy of the object becomes potential energy + kinetic energy as the object is now in motion.

At position C, the object is still in motion and the energy is all kinetic.

Answer:

C

A

B

Explanation:

The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

For more question on mass

https://brainly.com/question/1838164

#SPJ8

Answer:

the mercury would be lowest at location 4.

Explanation: this is because pressure and altitudes have inverse relationship at the troposphere. higher altitude has lower pressure. also pressure at location 4 contribute to pressure at location 1. but pressure at location 1 do not contribute to pressure at location 4.

a. NH3 (Ammonia): In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted.

b) 1.0L container of CHCl3 at STP, dipole-dipole interactions (along with London dispersion forces) would be present.

a. NH3 (Ammonia):

In a 1.0L container of NH3 at Standard Temperature and Pressure (STP), intermolecular forces such as hydrogen bonding would be exerted. Ammonia (NH3) molecules consist of one nitrogen atom bonded to three hydrogen atoms, forming a trigonal pyramidal shape.

Hydrogen bonding is a type of intermolecular force that occurs when a hydrogen atom is covalently bonded to an electronegative atom (in this case, nitrogen) and interacts with another electronegative atom (in this case, the nitrogen atom of a neighboring NH3 molecule).

b. CHCl3 (Chloroform):

In a 1.0L container of CHCl3 (chloroform) at STP, intermolecular forces such as dipole-dipole interactions would be exerted. Chloroform (CHCl3) molecules consist of one carbon atom bonded to three hydrogen atoms and one chlorine atom, forming a tetrahedral shape.

Dipole-dipole interactions arise due to the difference in electronegativity between chlorine and hydrogen atoms. The chlorine atom is more electronegative than hydrogen, resulting in a polar covalent bond.

While dipole-dipole interactions are present in CHCl3, it is worth noting that CHCl3 also exhibits London dispersion forces. These forces occur due to temporary fluctuations in electron distribution, creating temporary dipoles.

London dispersion forces are the weakest type of intermolecular force but still contribute to the overall intermolecular interactions in CHCl3.

For more such questions on Standard Temperature and Pressure visit:

https://brainly.com/question/14820864

#SPJ8

Answer:The unstable nucleus of radioactive atoms emit radiation. When this occurs, a new atom and element are formed. This process is called radioactive decay. It continues until the forces in the unstable nucleus are balanced.

Explanation:

The overall enthalpy of formation for potassium chloride is -4395 kJ/mol.

Let us use Hess's Law to estimate the overall enthalpy of formation for potassium chloride. K(s) + 12 Cl₂(g) → KCl(s). The enthalpy of sublimation for K is 90 kJ/mol. So, K(s) → K(g) ΔH = 90 kJ/mol. The bond dissociation energy of Cl₂ is 239 kJ/mol. So, Cl₂(g) → 2 Cl(g) ΔH = 2 x 239 = 478 kJ/mol.

The electron affinity of Cl is -349 kJ/mol. So, Cl(g) + e- → Cl⁻(g) ΔH = -349 kJ/mol. The ionization energy of K is 419 kJ/mol. So, K(g) → K⁺(g) + e⁻ ΔH = 419 kJ/mol. The lattice formation enthalpy of KCI is -690 kJ/mol. So, K⁺(g) + Cl⁻(g) → KCl(s) ΔH = -690 kJ/mol.

The enthalpy of formation of potassium chloride is the sum of the above reactions. ΔHf for KCl(s) = ΔHsub(K) + ΔHdiss(Cl₂) + ΔHea(Cl) + ΔHi(K) + ΔHlf(KCl) ΔHf for KCl(s) = (90 kJ/mol) + (478 kJ/mol) + (-349 kJ/mol) + (419 kJ/mol) + (-690 kJ/mol) = -4395 kJ/mol. Thus, the overall enthalpy of formation for potassium chloride is -4395 kJ/mol.

Learn more about Hess's Law here:

https://brainly.com/question/10504932

#SPJ11

Answer:

gas production

Explanation:

Answer:

gas formation

Explanation:

frothy bubbles produced by carbon dioxide gas are a sign that a chemical reaction has occurred when a based is mix with acid.

Answer:

80 degrees

Explanation:

Malonyl-CoA is an important intermediate in fatty acid synthesis and is essential for regulating fatty acid metabolism. It is synthesized from acetyl-CoA, which is the end-product of the citric acid cycle and a major energy source for cells.

Acetyl-CoA is the molecule that regulates the enzyme that catalyzes malonyl-CoA synthesis. Acetyl-CoA is the end-product of the citric acid cycle and is a major source of energy for cells. It is also the starting point for fatty acid biosynthesis. Acetyl-CoA is used to synthesize malonyl-CoA, which is then used in the elongation of fatty acids. Acetyl-CoA is the molecule that activates the enzyme involved in fatty acid synthesis, acetyl-CoA carboxylase, which is responsible for the conversion of acetyl-CoA to malonyl-CoA. Therefore, acetyl-CoA is the molecule that regulates the enzyme that catalyzes malonyl-CoA synthesis.

Malonyl-CoA regulates the enzyme acetyl-CoA carboxylase, which is responsible for the conversion of acetyl-CoA to malonyl-CoA. Acetyl-CoA carboxylase is an enzyme that catalyzes the formation of malonyl-CoA from acetyl-CoA, which is the starting point for fatty acid synthesis. Malonyl-CoA is then used in the elongation of fatty acids. Therefore, acetyl-CoA carboxylase is the enzyme that malonyl-CoA regulates.

Learn more about Enzymes: https://brainly.com/question/1596855

#SPJ4

The volume, in milliliters, of the krypton gas is 523ml.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as

                                    PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Mass = 10g

Pressure = 563 mm Hg

Temperature = 298 K

moles of Kr =mass / atomic mass

= 10 / 84

= 0.119 moles

PV = nRT

563 × V = 0.119 × 8.314 × 298

V = 0.523L = 523ml

Learn more about Ideal Gas law, here:

https://brainly.com/question/28257995

#SPJ1

Answer:

Explanation:

Explanation:

Plastic takes time to degrade which means it has great longevity. Plastic does not break as easily as glass or other materials. It lasts long and offers great service. Plastic storage containers offer greater flexibility than any other packaging materials.

As the elements combine, they react and generate chemical. Therefore, in below given way compounds can be summarized.

A compound seems to be a substance that is composed of two or more separate chemical elements mixed in a defined ratio in chemistry.

As the elements combine, they react and generate chemical connections that are hard to break. These bonds occur as a result of atoms sharing or exchanging electrons.

A                  non polar molecule solid

B                 a metal

C                 a polar molecule solid

D                 an ionic compound

E                 a giant molecular substance

Therefore, in above given way compounds can be summarized.

To know more about chemical compound, here:

https://brainly.com/question/26487468

#SPJ1

Answer:

A. L•atm/mol K

Explanation:

The ideal gas law equation is given as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant

T = temperature (K)

As rightly stated in this question, R is the ideal gas constant, which can be different depending on the unit of the other components.

At STP;

V = 22.4L

P = 1 atm

T = 273 K

n = 1 mole

Hence, using PV = nRT

R = PV/nT

R = 1 × 22.4/1 × 273

R = 22.4/273

R = 0.08205

Approximately, R = 0.0821

With the units of P as atm, V as L, n as mol and T as K; R will be 0.0821 L•atm/mol K

Answer:

See explanation

Explanation:

The third law of thermodynamics states that "the entropy of a perfect crystal of a pure substance approaches zero as the temperature approaches zero" (Wikipedia).

One example of the third law of thermodynamics has to do with steam. Steam is gaseous water. Since it is a gas, its molecules are free to move around therefore its entropy is high. When the temperature of the steam is decreased below 100 degrees, the molecules of steam loose energy and turn into liquid water and do not move as freely as they did in the gaseous state. If the temperature is further decreased to yield ice at zero degrees, the molecules of water are "frozen" in their positions and the entropy of the system decreases to zero.

Also, the ions in ionic crystal solids move around when the substance is in solution or in molten state hence the substance conducts electricity. When the ionic substance is in solid state, the ions do not move about and the entropy of the solid system tends towards zero.

Answer:

Ⓓ The process follows the law of conservation of mass and energy is found in the product

Explanation:

This question depicts PHOTOSYNTHESIS, which is the process employed by green plants to manufacture their food in form of sugars (glucose). The general equation, which was given in the question is as follows:

6CO2 + 6H2O + energy → C6H12O6 + 6O2

This chemical reaction follows the LAW OF CONSERVATION OF MASS, which states that the amount of matter in reactant must equate that of the product. In this case, each element contains the same number of atoms in both reactant side and product side.

Also, energy is contained in the product but stored in the chemical bonds of the glucose molecule formed.

You feel heat from a campfire: Radiation

A mug filled with a hot beverage warms your hands: Conduction

A heat lamp keeps baby chicks warm: Radiation

Warm water moves from the bottom of a pot to the top: Convection

Thunderclouds form in the atmosphere: Convection

A snowball melts in your hands: Conduction

A hot dog cooks over a campfire: Conduction

A cool breeze blows onto the beach on a hot day: Convection

The Sun causes snow to sublimate on a clear winter day: Radiation

A spoon placed in a cup of hot tea becomes hot to the touch: Conduction

Heat can be transferred through three different methods: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between two objects. Convection is the transfer of heat by the movement of a fluid, such as air or water. Radiation is the transfer of heat through electromagnetic waves.

In the given situations, the heat transfer by radiation occurs from the campfire, heat lamp, and sun. Conduction occurs when you feel the warmth of a hot beverage or the hot dog cooking over the campfire. Convection occurs in the atmosphere, where warm air rises, and cool air falls, leading to thundercloud formation, or when warm water moves from the bottom of a pot to the top.

To know more about the Heat transfer, here

https://brainly.com/question/13433948

#SPJ1

Answer:  It is not accurate to claim that the "mystery" of who had built the mounds in the American Midwest and Southeast has been completely solved to the satisfaction of virtually all scientists.

Explanation:

While there has been extensive research and progress made in understanding these ancient mounds, there are still debates and ongoing investigations surrounding their origins and the cultures responsible for their construction.

The mounds, such as those found at Cahokia in Illinois or the various mound sites in Ohio, were built by indigenous peoples of North America. However, determining specific details about the builders, their identities, and the reasons behind mound construction can be challenging due to limited historical records and the passage of time.

Archaeologists and anthropologists have used various methods, including radiocarbon dating, artifact analysis, and excavation techniques, to study these sites. They have identified different mound-building cultures such as the Adena, Hopewell, and Mississippian cultures. Still, there are unanswered questions and ongoing research to refine our understanding of these ancient civilizations and their mound-building practices.

While progress has been made in unraveling the mysteries surrounding the mound builders of the American Midwest and Southeast, it would be inaccurate to claim that the matter has been definitively resolved and satisfies all scientists. Research and exploration in this field continue to shed light on these fascinating ancient cultures and their monumental constructions.

Learn more about American mounds here, https://brainly.com/question/18296863

#SPJ11

After 24.3 days, 3 half-lives of iodine-131 have passed. Therefore, the amount remaining can be found by multiplying the original amount of 75.0 mg by \((1/2)^3\), which equals 9.38 mg. Option B is correct.

The decay of radioactive isotopes can be modeled using the concept of half-life. Half-life is the amount of time it takes for half of the original sample of the isotope to decay.

In this problem, we are given that the half-life of iodine-131 is 8.1 days. This means that after 8.1 days, half of the original sample will remain, and after another 8.1 days, half of that remaining sample will decay, and so on.

We can use this information to find how much of a 75.0 mg sample of iodine-131 will remain after 24.3 days.

First, we need to determine the number of half-lives that have elapsed. To do this, we divide the elapsed time by the half-life:

24.3 days / 8.1 days per half-life = 3 half-lives

So, after 3 half-lives, the amount of iodine-131 remaining can be found by multiplying the original amount (75.0 mg) by \((1/2)^3\) (since 3 half-lives have passed):

Amount remaining = 75.0 mg * \((1/2)^3\)

= 75.0 mg * 0.125

= 9.38 mg

To learn more about radioactive isotopes

https://brainly.com/question/28039996

#SPJ4

Complete question:

The half-life of iodine-131 is 8.1 days. how much of a 75.0 mg sample will remain after 24.3 days? group of answer choices

A - 75.0 mg

B - 9.38 mg

C - 4.68 mg

D - 18.8 mg

E - 37.5 mg

The molarity of this solution is 1.39 M.

Molarity, on the other hand, refers to the content of a substance or ion in a solution, whereas normality only refers to the molar concentration of the solution's acid or base components.

The formula is as follows:

Molarity (M) = moles of solute/liters of solution

We must first locate the copper(II) sulphate molecules. By splitting the solute's mass by its molar mass, we can determine this.

The molar mass of copper(II) sulfate is:

63.55 g/mol (for copper) + 2(32.06 g/mol) (for sulfur) + 4(16.00 g/mol) (for oxygen) = 159.61 g/mol

So, moles of copper(II) sulfate = 55.423 g / 159.61 g/mol = 0.347 moles

The volume of solution is 250.0 mL=0.250 L

Use the formula to calculate the molarity:

Molarity=0.347 moles / 0.250 L

= 1.39 M.

To know more about molarity visit:-

https://brainly.com/question/2817451

#SPJ1

The statement that is true for glucose and fructose is  "They can combine with many other monomers to form a polysaccharide (option D).

What are glucose and fructose?

Both glucose and fructose are monosaccharides, which are simple sugars that cannot be further broken down into smaller units by hydrolysis. However, they can be combined with each other or with other monosaccharides to form more complex carbohydrates such as disaccharides (e.g. sucrose) or polysaccharides (e.g. starch or glycogen).

Option A is incorrect because glucose and fructose are monomers, not dimers. Option B is incorrect because sugar-phosphate backbones are a feature of nucleic acids, not carbohydrates. Option C is incorrect because proteins are made up of amino acids, not monosaccharides.

Learn about monosaccharides here https://brainly.com/question/1157431

#SPJ1

The law of conservation of energy states that energy cannot be created or destroyed but can be converted or transferred. So when you're eating a burger which has chemical energy, it is transferred to mechanical energy if you go out and ride a bicycle. Another example is when the Sun which is thermal energy shines on the apple tree, it is converted to chemical energy because the apple has chemical energy. Transferred is pretty similar.

The law of conservation of energy is obeyed as the potential energy is converted to kinetic energy and is neither created nor destroyed.

According to the law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

The law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.

Learn more about law of conservation of energy,here:

https://brainly.com/question/29775341

#SPJ2

Answer:

sodium chloride and lead (II) acetate

potassium sulfate and strontium iodide

chromium (III) nitrate and sodium phosphate

1.       2NaCl + Pb(CH3COO)2 → 2NaCH3COO + PbCl2

2.       K2SO4 + SrI2 → KI + SrSO4

3.       Cr(NO3)3 + Na3PO4 →CrPO4 + NaNO3

Explanation:

Answer:

The empirical formula is the simplest form;

Given:

Oxygen O at 94.1% and

H at 5.9%

Assume 100grams.

94% = 0.941 x 100gm. = 94.1 gm x 1mole/16gm. = 5.88 moles of O

5.9% = 0.059 x 100gm. = 5.9gm. X 1moleH/1.002gm. = 5.88 moles of H

There is one mole of O for each mole of H so the empirical formula is \(O_1H_1\)

and written as OH.

Explanation:

\(given \: that \: oxygen \: by \: 94.1\% (.941)\\ hydrogen \: by5.9\%(.059) \\ in \: 100gram \: \\ oxygen = 100 g\times .941 = 94.1 \times \frac{1(mol)}{16g} \\ = 5.88moles \: of \: oxygen \\ in \: hydrogen \: = .059\times 100 = 5.9 \times \frac{1mol}{1.002gram} \\ = 5.88mole \: of \: hydrogen \\ \: so \: here \: \: both \: oxygen \: andhydrogen = 5.88 \\their \: ratio = 1 \: 1 \\ so \: emparical \: formula = oh \\ thank \: you\)

In a test tube, when sodium hydrogen carbonate is added to acetic acid, a gas is released right away with a quick fizz. What gas is this? Describe the procedure used to test this gas.

Acetic acid and sodium hydrogen carbonate combine to produce a quick effervescence of CO 2.The word "to absorb" also seems strange in this context. Everything about this is absurd. Because carbonate ions hydrolyze to produce hydroxide and bicarbonate ions, a sodium carbonate aqueous solution has a basic pH. The pH is basic even when starting with sodium bicarbonate (baking soda); for normal amounts.

To learn more about sodium hydrogen , click here.

https://brainly.com/question/29327783

#SPJ4

The statements which is true about the reactants from the given simulation above is: It involves the breaking of chemical bonds.

The correct answer choice is option c

For a chemical reaction to occur, the bond between the reacting substances breaks either by covalent or electrovalent bonding in order to form new substance.

So therefore, reactants usually break chemical bonds duringchemical reaction.

Complete question:

A chemical reaction causes the chemical compositions of substances to change. Reactants are substances that enter into a reaction, and products are substances produced by the reaction

Which of the following are the reactants for this simulation? Select all that apply

a. A chemical reaction results to formation of new bonds

b. A chemical reaction involves the formation of new substance.

c. It involves the breaking of chemical bonds

Read more chemical reactions: https://brainly.com/question/5024599

#SPJ1