adding boron atoms from column iii in the periodic table to silicon from column iv produces a n-type extrinsic semiconductor.T/F

At a pH of 7, the charged groups present in glycine are -NH3+ and -COO−.

So, the correct answer is D) A and B.

At this pH, the amino group (-NH3+) is positively charged, and the carboxyl group (-COO−) is negatively charged, resulting in a zwitterionic form of glycine. The amino group (-NH2) on glycine can act as a base and pick up a hydrogen ion (H+) to become positively charged (-NH3+), while the carboxyl group (-COOH) can act as an acid and donate a hydrogen ion to become negatively charged (-COO-).

Therefore, at pH 7, the amino group is protonated to become -NH3+ and the carboxyl group is deprotonated to become -COO-. The net charge of glycine at pH 7 is neutral, as the positive and negative charges cancel each other out.

The chemical structure of glycine at pH 7 can be represented as H3N+CH2COO-.

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1.42x10^24 molecules

40.0 grams NH3 (6.02x10^23/17.0 grams NH3)= 1.42x10^24 molecules

I agree with the student's statement that states that ozone depletion is causing global warming.

Ozone layer depletion is the gradual thinning of the earth’s ozone layer in the upper atmosphere caused due to the release of chemical compounds containing gaseous bromine or chlorine from industries or other human activities.

The ozone layer is a region in the earth’s stratosphere that contains high concentrations of ozone and protects the earth from the harmful ultraviolet radiations of the sun.

Global warming is a sustained increase in the average temperature of the Earth, sufficient to cause climate change.

Greenhouse gases emitted into the atmosphere are the causes depletion of ozone layer, which in turn leads to global warming.

Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc.

Therefore, the statement made by the student is correct and I agree with it.

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Answer:

c

Explanation:

x basic and metallic while y is acidic

The study of chemicals is called chemistry.

The correct answer is B.

The compound which has oxygen in it is called oxide. According to the question, the element is react with the acid and base.

The X only reacts with the acidic compound but not basic compound hence the element X is basic in nature. while Y only reacts with the basic compound, not X, hence the Y element is acidic in nature.

Therefore, the correct answer is B.

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The percentage (by number of atoms) of the Sun that is hydrogen is approximately 91.2%.

The Sun is primarily composed of hydrogen, which is the most abundant element in its composition. Hydrogen makes up the vast majority of the Sun's mass and volume. The second most abundant element in the Sun is helium, followed by trace amounts of other elements.

The estimated elemental composition of the Sun is as follows:

Hydrogen: Approximately 91.2%

Helium: Approximately 8.7%

Trace amounts of other elements (such as oxygen, carbon, nitrogen, and others): Less than 0.1%

It is important to note that these values are approximate and can vary slightly depending on different estimates and measurements. However, the dominance of hydrogen in the Sun's composition is well-established and widely accepted.

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Transfer RNA (tRNA) delivers amino acids to the ribosome. Transfer RNA (tRNA) is a type of RNA molecule that plays a crucial role in protein synthesis.

Its main function is to transport specific amino acids to the ribosome during translation, where they are incorporated into the growing polypeptide chain.

Each tRNA molecule is specific to a particular amino acid. It contains an anticodon region that recognizes and pairs with the corresponding codon on the messenger RNA (mRNA) molecule, which carries the genetic information for protein synthesis. The tRNA molecule also carries the specific amino acid that corresponds to its anticodon.

When the ribosome reads the mRNA sequence during translation, tRNA molecules bind to the ribosome, bringing their amino acids to the site of protein synthesis. The tRNA anticodon recognizes the complementary codon on the mRNA, ensuring the correct amino acid is added to the growing polypeptide chain.

In summary, tRNA acts as an intermediary between the mRNA code and the amino acids, delivering the appropriate amino acids to the ribosome for protein synthesis.

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If the central atom in a molecule is sp3 hybridized, then it can have only one geometry.

In chemistry, hybridization is the idea of combining two atomic orbitals to create a brand-new category of hybridized orbitals. Typically, this mixing creates hybrid orbitals with completely distinct energies, morphologies, etc. One s orbital and three p orbitals combine to generate four sp3 orbitals, each of which has a 25% s character and a 75% p character. This process is known as sp3 hybridization. Anytime an atom is surrounded by four groups of electrons, this kind of hybridization is necessary.

Tetrahedral molecular geometry is the only one that can exist for sp3 hybridized center atoms. The form is tetrahedral if all the bonds are present.

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Answer:

Glue is made up of - combination of polyvinyl acetate (PVA), water, ethanol, acetone and other substances. The animal remains that are the raw materials for glue may include ears, tails, scraps of hide or skin, scrapings from the fleshy sides of hides, tendons, bones and collagen taken from animal parts, particularly horse hooves and bones.

Explanation:

Oof hope this helps =)

Answer:

Synthetic glues and adhesives are made from polyvinyl acetate, water, ethanol, acetone and some other substances. The water is used to modify the glue's consistency while the other substances are used to control the drying rate of the glue.

Answer:

Tetrahedral

Explanation:

Answer:

When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly

Explanation:

Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.

Mendeleev might have grouped thallium in the same group as lithium and sodium due to many reasons:

Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.

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Answer:

20 drops

Explanation:

Answer:

6,400 km = 6.4 x 10³ km.

Explanation:

Measurements => Scientific Notation.

Scientific notation is a way to express numbers as the product of two numbers: a coefficient and the number 10 raised to a power. The exponent must be a non-zero integer, it can be either positive or negative. The value of the coefficient is greater than or equal to 1 but it should be less than 10.

In this case, we request to write 6,400 kilometers in scientific notation. Based on the concept of scientific notation, our coefficient would be 6.4 because is greater than 1 and less than 10. 6,400 is a positive integer that contains 4 digits, so we have to multiply 6.4 by 1000 to obtain 6,400. 1000 equals 10³, so the 6,400 kilometers in scientific notation would be 6.4 x 10³ kiloem km.

The balanced equation for the reaction between hydrogen and oxygen to form water is:

2H2 + O2 -> 2H2O

To react 4 moles of hydrogen with 3 moles of oxygen, we will also need 1.5 moles of oxygen.

Since we have enough hydrogen and not enough oxygen to react completely, we can calculate the theoretical yield of water produced.

4 moles of H2 will react to produce 2 moles of H2O and 1.5 moles of O2 will react to produce 0.75 moles of H2O. Therefore, the total theoretical amount of water produced is 2 + 0.75 = 2.75 moles of water.

percent yield = (actual yield / theoretical yield) x 100

percent yield = (3 / 2.75) x 100 = 109.09%.

So the percent yield is 109.09%. This means that 109.09% of the theoretical yield was actually produced, and the reaction was more efficient than expected.

It's worth noting that percent yield can't be more than 100% because it implies that more than the theoretical amount of product was produced, which is not possible. In this case, the percent yield is not a realistic value, therefore, the actual yield and the theoretical yield should be rechecked.

Answer:

im too stoned for this

Explanation:

sorry man

The classification of the space ranging from 0-18 inches is known as the "clear zone."

The clear zone refers to the area that should be free from any obstructions or hazards to ensure the safety and mobility of individuals. It is a crucial concept in various fields such as transportation and construction. In transportation, the clear zone pertains to the area adjacent to roads or highways, where objects like trees, poles, or signage should be minimized or designed to break away upon impact. This allows for safe recovery and reduced severity of accidents. By maintaining a clear zone, the risk of collisions and injuries can be mitigated, promoting safer environments for pedestrians, cyclists, and motorists alike.

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Answer:

The difference between mass and weight is that mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon that mass. Mass is the measure of the amount of matter in a body. Mass is denoted using m or M.

Explanation:

the different between mass and weight is that the weight is the measure of the force of gravity on an object and the mass of an object will never change ,but the weight of an iteam can change based on its location

Answer:

A. 4 only

Explanation:

One of the tests for purity is by determining the melting point of a substance. A pure substance has a sharp meting point.

If the solid in question is a pure solid, when it is heated, it will exhibit a sharp melting point. Mixtures however melt over a range of temperatures due to the presence of impurities in the solid.

Answer:

1. Potassium, K.

2. Calcium, Ca.

3. Gallium, Ga.

4. Carbon, C.

5. Bromine, Br.

6. Barium, Ba.

7. Silicon, Si.

8. Gold, Au.

Explanation:

Atomic radius can be defined as a measure of the size (distance) of the atom of a chemical element such as hydrogen, oxygen, carbon, nitrogen etc, typically from the nucleus to the valence electrons. The atomic radius of a chemical element decreases across the periodic table, typically from alkali metals (group one elements such as hydrogen, lithium and sodium) to noble gases (group eight elements such as argon, helium and neon). Also, the atomic radius of a chemical element increases down each group of the periodic table, typically from top to bottom (column).

Additionally, the unit of measurement of the atomic radius of chemical elements is picometers (1 pm = 10 - 12 m).

1. Li or K: the atomic radius of lithium is 167 pm while that of potassium is 243 pm.

2. Ca or Ni: the atomic radius of calcium is 194 pm while that of nickel is 149 pm.

3. Ga or B: the atomic radius of gallium is 136 pm while that of boron is 87 pm.

4. O or C: the atomic radius of oxygen is 48 pm while that of carbon is 67 pm.

5. Cl or Br: the atomic radius of chlorine is 79 pm while that of bromine is 94 pm.

6. Be or Ba: the atomic radius of berryllium is 112 pm while that of barium is 253 pm.

7. Si or S: the atomic radius of silicon is 111 pm while that of sulphur is 88 pm.

8. Fe or Au: the atomic radius of iron is 156 pm while that of gold is 174 pm.

The atoms in each pair which has the larger atomic radius is;

Definition:

Atomic radius is simply the distance from the centre of the nucleus to the outermost shell containing electrons.

In other words, the atomic radius is the distance from the center of the nucleus to the point up to which the electron cloud density is maximum.

Trend:

The atomic radius of atoms generally decreases from left to right across a period. The atomic radius of atoms generally increases from top to bottom within a group.

It is on this basis that atoms with the larger atomic radius are determined

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39.17 ml of the 15.0 M HF stock solution is required to prepare 250.0 ml of a 2.35 M HF solution.

To prepare 250.0 ml of a 2.35 M HF solution from a 15.0 M HF stock solution, we can use the formula M1V1 = M2V2, where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
In this case, we are looking for V1, the volume of the stock solution required.
M1 = 15.0 M
V1 = ?
M2 = 2.35 M
V2 = 250.0 ml
Plugging the values into the formula, we get:
15.0 M x V1 = 2.35 M x 250.0 ml
Solving for V1, we get:
V1 = (2.35 M x 250.0 ml) / 15.0 M
V1 = 39.17 ml
Therefore, 39.17 ml of the 15.0 M HF stock solution is required to prepare 250.0 ml of a 2.35 M HF solution.

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The bromophenol blue solution will become more yellow as a result of the addition of an acid, which will tilt the balance in favor of the acidic side.

The bromophenol blue solution will become more blue as a result of the addition of a base, which will shift the equilibrium toward the basic side.

Bromophenol blue is a pH indicator that undergoes a color change depending on the acidity or basicity of the solution. It appears yellow in acidic conditions (pH below 3), green at neutral pH (around 6), and blue in basic conditions (pH above 8).

We can forecast the results of adding an acid or a base to a solution containing bromophenol blue by using Le Chatelier's principle, which states that a system in equilibrium will respond to a disturbance by moving in a direction that minimizes the influence of the disturbance.

A solution can become more acidic by the addition of an acid, which raises the concentration of H⁺ ions in the solution. Le Chatelier's principle states that the system will change in a way that lessens the impact of the disturbance. To lessen the surplus H⁺ ions, the equilibrium will change to the acidic side. The bromophenol blue solution will subsequently become more yellow, suggesting a rise in acidity.

Addition of a base: Adding a base to a solution makes it more basic by raising the concentration of OH⁻ ions in the solution. Le Chatelier's principle states once more that the system will change in a way that lessens the impact of the disturbance. To lessen the surplus OH- ions, the equilibrium will change to the basic side. As a result, the solution of bromophenol blue will darken more, indicating a rise in basicity.

To sum up:

The bromophenol blue solution will become more yellow as a result of the addition of an acid, which will tilt the balance in favor of the acidic side.

The bromophenol blue solution will become more blue as a result of the addition of a base, which will shift the equilibrium toward the basic side.

These forecasts are based on the idea that the equilibrium will change in a way that offsets reaction the disturbance brought on by the addition of acid or base, maintaining balance in the process.

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Answer:

The answer is OXIDATION REACTION.

Answer:

There's no other metal.

Explanation:

Iron reacts only with water and air to get the object rusted. There is no other metal which reacts with iron to get the object rusted.

However,

Zinc can be used to protect Metal from Rusting.

One molecule of sucrose is burned with oxygen to make carbon dioxide and water.

What is sucrose?

The components of the disaccharide sugar sucrose are glucose and fructose. It is produced naturally by plants and is the main component of white sugar. C12H22O11 is the chemical formula for it.

To extract and refine sucrose for human use, either sugarcane or sugar beet are employed. Crushing the cane creates raw sugar, which is subsequently delivered to other sectors to be refined into pure sucrose. Sugar mills are usually located in tropical regions near to sugarcane plantations.

C12H22O11 + 12O2 = 12CO2 + 11H2O

When one molecule of sucrose is burnt, we get 12 carbon dioxide molecules.

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Cesium Sulfite Chemical Formula:

Cs2SO3

Answer:

An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Radioisotopes may occur in nature or be made in a laboratory. In medicine, they are used in imaging tests and in treatment.

Hope I could help!

Answer:

(RAY-dee-oh-I-suh-tope) An unstable form of a chemical element that releases radiation as it breaks down and becomes more stable. Radioisotopes may occur in nature or be made in a laboratory. In medicine, they are used in imaging tests and in treatment. Also called radionuclide.

Explanation:

Answer:

B: The Doppler effect shows stars with blue shifted light.

Explanation:

American astronomer Edwin Hubble and others discovered in the 1920s that the Universe is expanding by showing that most galaxies are receding from the Milky Way — and the farther away they are, the faster they are receding. The roughly constant ratio between speed and distance became known as the Hubble constant. Another explanation is that, Edwin Hubble used the Doppler effect to determine that the universe is expanding. Hubble found that the light from distant galaxies was shifted toward lower frequencies, to the red end of the spectrum. If the galaxies were moving toward Hubble, the light would have been blue-shifted

Answer:

B

Explanation:

Oxygen of 0.28 liters will be required to react with 0.56 liters of sulfur dioxide.

To determine the number of liters of oxygen required to react with sulfur dioxide, we need to examine the balanced chemical equation for the reaction between sulfur dioxide (\(SO_2\)) and oxygen (\(O_2\)).

The balanced equation is:

2 \(SO_2\)+ O2 → 2 \(SO_3\)

From the equation, we can see that 2 moles of sulfur dioxide react with 1 mole of oxygen to produce 2 moles of sulfur trioxide.

We can use the concept of stoichiometry to calculate the volume of oxygen required. Since the ratio between the volumes of gases in a reaction is the same as the ratio between their coefficients in the balanced equation, we can set up a proportion to solve for the volume of oxygen.

The given volume of sulfur dioxide is 0.56 liters, and we need to find the volume of oxygen. Using the proportion:

(0.56 L \(SO_2\)) / (2 L \(SO_2\)) = (x L \(O_2\)) / (1 L \(O_2\)2)

Simplifying the proportion, we have:

0.56 L \(SO_2\)= 2x L \(O_2\)

Dividing both sides by 2:

0.56 L \(SO_2\)/ 2 = x L \(O_2\)

x = 0.28 L \(O_2\)

Therefore, 0.28 liters of oxygen will be required to react with 0.56 liters of sulfur dioxide.

It's important to note that this calculation assumes that the gases are at the same temperature and pressure and that the reaction goes to completion. Additionally, the volumes of gases are typically expressed in terms of molar volumes at standard temperature and pressure (STP), which is 22.4 liters/mol.

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Answer:

Carbon flows between the atmosphere, land, and ocean in a cycle that ... Coal and other fossil fuels are a convenient source of energy, but when ... If carbon dioxide rises in the atmosphere because of an increase in ... However, the slow carbon cycle also contains a slightly faster component: the ocean.

Explanation:

I got you fam

The symbol and charge for the cation and anion that make up the ionic compound FeI2 are Fe2+ and I- respectively.

Explanation:

An ionic compound is composed of a cation (positive ion) and an anion (negative ion). The cation is typically a metal and the anion is typically a nonmetal. In the case of FeI2, the cation is Fe (iron) and the anion is I (iodine).

The charge of the cation is determined by the number of electrons it has lost to become positively charged. In the case of FeI2, the iron atom has lost two electrons to become Fe2+.

The charge of the anion is determined by the number of electrons it has gained to become negatively charged. In the case of FeI2, the iodine atom has gained one electron to become I-.

Therefore, the symbol and charge for the cation and anion that make up the ionic compound FeI2 are Fe2+ and I- respectively.

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Answer:

hcl is a covalent compound

Explanation: