Which best describes a semiconductor

Answer:

First one is true and the second select all of them

Explanation:

lemme know if it's correct

The determined percent error is 2.67%, the uncertainty of the metric graduation is 0.025 cm, and the length of the line is 3.75 cm.

a) The uncertainty of the metric graduation can be calculated as the half of the smallest division on the ruler, which is 0.05 cm in this case. Therefore, the uncertainty would be 0.05 cm / 2 = 0.025 cm.

b) To determine the length of the line shown below the metric scale, we need to make an estimate of the position of the line relative to the scale. Based on the image, it appears that the line is approximately between 3.7 cm and 3.8 cm. Therefore, we can estimate the length of the line to be around 3.75 cm.

3. The percent error, it is calculated as follows:

(True Value - Measured Value) / True Value * 100% is the formula for percent error.

For the student's measurement of 3.65 cm, the percent error would be:

Percent error = (3.65 - 3.75) / 3.75 * 100% = -2.67%

This implies that the student's measurement was 2.67% lower than the true value reported by the instructor.

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The complete question is:

Answer:

Presence of an Electrolyte

Metal Surface

Oxygen or Other Oxidizing Agent

Difference in Potential

Electrochemical Pathway

Explanation:

The solute molecules will be more readily dissolved in the solvent molecules by heating the solvent. Thus, option C is correct.

The dissolution of solute molecules in the solvent molecules has been based on the attraction between the solute and solvent. The higher interaction between the solute and solvent molecules has been responsible for higher solubility.

The solute molecules have interactions present within them. This limits the interaction of the solute with solvent, and thereby the solubility. With the gain in energy by the solute molecules, there have been lesser interactions between solute molecules, and they are available for interacting with the solvent molecules.

The increased interactions between the solute and solvent molecules by the gain of energy due to heating have been responsible for increased solubility. Thus, option C is correct.

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Answer:

Volume is 0.0247L

Explanation:

This question involves the use of Boyle's law which states that the volume of a given mass of gas is inversely proportional to it's pressure provided that temperature remains constant.

Mathematically,

v = k/p

K = VP

P1V1 = P2V2 = P3V3 = .........=PnVn

V = volume

p = pressure

Data;

P1 =1.0atm

V1 = 1.73L

P2 = 70atm

V2 = ?

P1V1 = P2V2

V2 = P1V1 / P2

V2 = (1.0×1.73)/70

V2 = 0.0247L

The volume of the sample is 0.0247L

Answer: Be hard to move it.

Explanation: If you have 1 book, and you put 5 more books on top, then the 6 books will be heavy to move.

Answer:hey man hey man

Explanation:

ooo she fine  

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 10.3 g

volume = 10 mL

The density is

\(density = \frac{10.3}{10} \\ = 1.03\)

We have the final answer as

Hope this helps you

Answer:

2 g/ml

Explanation:

I got it right on my test.

The correct IUPAC name of the compound is 7-chlorohept-(3E)-en-1-yne.

The IUPAC name of a compound is determined by following a set of rules established by the International Union of Pure and Applied Chemistry (IUPAC). To determine the correct name of the compound given, we need to analyze its structure and identify the functional groups, substituents, and their positions.

In this case, the compound has a chain of seven carbon atoms (hept) with a chlorine atom (chloro) attached at the 7th position. It also contains a triple bond (yne) and a double bond (en) on adjacent carbon atoms. The stereochemistry of the double bond is indicated by the E configuration, which means that the two highest priority substituents are on opposite sides of the double bond.

Therefore, the correct IUPAC name of the compound is 7-chlorohept-(3E)-en-1-yne.

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Answer:

1.48×10²⁴ Cu atoms

Explanation:

For this question you need to use Avogadro's number 6.022×10²³atoms.

2.45 moles of Cu ×\(\frac{6.022x10x^{23} atoms }{1 mole}\)= 1.47539×10²⁴ atoms.

The moles cancel out so you are left with atoms.

Since there are 3 significant figures in the question there should be 3 significant figures in your answer, which is 1.48×10²⁴ Cu atoms.

Explanation:

from definition of density we have

density=mass/volume

and density=55 mass=220g

volume=220/55

volume=4ml

or 4×10^-3l

Answer:

4cm³

Explanation:

220.0g is our mass

55.0g/cm³ is our density

220g/55g/cm³

= 4cm³

The molarity of the sample of HNO3 (aq.) is neutralized by 22.1 milliliters of 0.250 m KOH(aq.) is 0.193M

Molarity is also called as molar concentration. Molarity can be defined as the measure of the concentration of a chemical specie of the reaction in particular of a solute in a solution which is in terms of amount of substance per unit volume of solution.

The molarity can be calculated as,

M1 V1 = M2 V2

Hehe, M1 is the molarity of the acid and V1 is the volume  of the an acid. M2 is the molarity of the base and V2 is the volume of the base of the solution.

When 35.0-milliliter sample of HNO3 (aq.) is neutralized by 22.1 milliliters of 0.250 m KOH(aq.)

Putting all the values in the expression we get,

M1=M2V2/V1

    =(0.150) (32.1)/25.0

    = 0.193M

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Moles of Hydrogen gas collected : 0.127

The reaction coefficient in a chemical equation shows the mole ratio of the components of the reactants and products

If one mole of the reactant or product is known, then we can determine the moles of the other compounds involved in the reaction

Reaction

Mg(s)+2HCl(aq)⇒H₂(g)+MgCl₂(aq)

mass of Mg=3.09 g

mol Mg (Ar= 24,305 g/mol) :

\(\tt mol=\dfrac{mass}{Ar}\\\\mol=\dfrac{3.09}{ 24,305}\\\\mol=0.127\)

Magnesium metal reacts with excess Hydrochloric acid, so Mg as a limiting reactant and moles of product is based on moles of Mg

From the equation, moles ratio Mg : H₂ = 1 : 1, so moles H₂ :

\(\tt \dfrac{1}{1}\times 0.127=0.127\)

Answer:

When H2O acts as a base, it gains one H, which forms its conjugate acid, H30. ... Conjugate acid-base pairs: H2SO4/HSO4 andH3O+/H2O ... CO32-(aq) + H2O(1) 2 HCO3 (aq) + OH(aq).

The conjugate acid of HSO4- in the reaction is H2SO4.

The conjugate acid of a particular base is obtained by adding a proton to it.

Now we have the reaction; H2SO4 (aq) + H2O(l) ----->  H3O+(aq) + HSO4^-(aq). We have to look at the reaction carefully and find out which specie can be obtained from HSO4- by adding a proton.

Clearly, the specie that we are looking for is the same specie from which a proton was removed to yield HSO4-.

Through examination of the reaction shows that this specie must be H2SO4.

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It is crucial to maintain a constant temperature because the incubator will work with living things. Additionally, these samples are quite delicate.

Designing materials for use in engineering applications at high temperatures requires consideration of thermal stability. The ability of an alloy to maintain ductility and toughness during prolonged temperature exposure can be referred to as this property.

Several growth restrictions are present for organisms developing at low temperatures: nucleic acid structures become much more solid, membrane fluidity diminishes, enzyme reaction rates slow down, affinity of transport and uptake systems declines.

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Answer:

D

Explanation:

water is used to delude just about anything

Answer:

Explanation:

Cupric oxide has the +2 oxidation state of copper, and it has the chemical formula CuO. One copper atom associates one oxygen atom.

Reaction B releases more energy than reaction A releases.The correct option is B)

The energy released by these reactions can be evaluated using the concept of nuclear binding energy. Nuclear binding energy is defined as the amount of energy required to break up a nucleus into its individual nucleons (protons and neutrons). This energy is a measure of the strong nuclear force that holds a nucleus together.

Reaction A involves the formation of a sodium chloride molecule by the transfer of one electron from a sodium atom to a chlorine atom. The energy released in this reaction is due to the formation of ionic bonds between the positively charged sodium ion and negatively charged chloride ion.

The energy released in this reaction is relatively low compared to nuclear reactions.In contrast, reaction B involves the decay of an oxygen isotope to form a nitrogen isotope, releasing a large amount of energy. The decay of an isotope involves the spontaneous breakdown of its nucleus due to a variety of factors.

This process releases a large amount of energy in the form of radiation and kinetic energy of the decay products.The energy released by nuclear reactions is much larger than that released by chemical reactions, such as reaction A. Therefore, option B, Reaction B releases more energy than reaction A releases, is the best description of the energy released per gram by these reactions.

Option B
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The purpose of running a mixed melting point is to determine the identity or purity of an unknown substance.

The purpose of running a mixed melting point is to confirm the identity and purity of a solid compound. It works by comparing the melting point of a known pure substance with that of a mixture of the pure substance and the unknown compound.

Step-by-step explanation:

1. Prepare two samples: one of the pure known substance and the other of a mixture of the known substance and the unknown compound.
2. Place each sample in a capillary tube.
3. Insert the capillary tubes into a melting point apparatus, which gradually increases temperature.
4. Observe and record the melting points of both samples.
5. Compare the melting points: if they are identical, the unknown compound is likely the same as the known substance. If the mixed melting point is lower or broader than the known substance's melting point, it indicates the presence of impurities or that the unknown compound is different from the known substance.

In summary, the purpose of a mixed melting point is to verify the identity and purity of a compound, and it works by comparing melting points of a pure substance and a mixture of the pure substance and the unknown compound.

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15.12 is the number of moles of oxygen in 454.3 g of sodium hydrogen phosphate (\(NaH{2}PO_{4}\))

To determine the number of moles of oxygen in 454.3 g of sodium hydrogen phosphate (\(NaH{2}PO_{4}\)), we need to use the molar mass and the formula of the compound.

The molar mass of \(NaH{2}PO_{4}\) can be calculated by adding up the atomic masses of each element in the formula:

Na: 22.99 g/mol

H: 1.01 g/mol (2 hydrogen atoms)

P: 30.97 g/mol

O: 16.00 g/mol (4 oxygen atoms)

Molar mass of \(NaH{2}PO_{4}\) = (22.99 g/mol) + (1.01 g/mol × 2) + 30.97 g/mol + (16.00 g/mol × 4) = 120.00 g/mol

Now, we can use the molar mass to calculate the number of moles of \(NaH{2}PO_{4}\):

Number of moles = Mass of substance / Molar mass

Number of moles of \(NaH{2}PO_{4}\) = 454.3 g / 120.00 g/mol ≈ 3.78 moles

Since there are four oxygen atoms in one molecule of \(NaH{2}PO_{4}\), we can calculate the number of moles of oxygen by multiplying the number of moles of \(NaH{2}PO_{4}\) by the ratio of oxygen atoms to \(NaH{2}PO_{4}\) molecules:

Number of moles of oxygen = 3.78 moles × 4 = 15.12 moles

Therefore, there are approximately 15.12 moles of oxygen in 454.3 g of sodium hydrogen phosphate.

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Answer:

They will slow down.

Answer:

I believe its gas

Explanation:

because it has no symbolic bonds

I am not sure with the answer but I think the answer is solid.

Answer:

The key difference Between tracheids and vessels is that the tracheids lack end plates while vessels have perforated end plates.

Explanation:

Answer:

Mass number = 4

Atomic number = 2

Explanation:

Mass numbers and atomic numbers are ways of identifying elements and explaining their properties.

Mass Number

The mass number describes the number of particles in the nucleus. This means that the mass number is the total number of protons plus neutrons. In the diagram above, the green particles are neutrons and the red particles are protons. There are 2 neutrons and 2 protons, so the mass number is 4.

Mass number is measured in amu. Amu stands for atomic mass units. Neutrons and protons both weigh 1 amu, so this atom weighs 4 amu.

Atomic Number

Atomic numbers are the most identifying part of any atom. Every element on the periodic table has a different atomic number. The atomic number is equal to the number of protons in an atom. We know that the red particles in the diagram are protons because they have a positive charge. There are 2 protons, so the atomic number must be 2.

Since we know the atomic number, we can identify the exact element. This diagram depicts helium, which always has 2 protons. Specifically, this is Helium-4 (elements can be written with their mass numbers hyphenated).

Answer:

500 ml is in a water bottle

Explanation:

Answer:

393.73 g/mol

Explanation:

brainliest? have a wonderful day

A reaction that requires energy would be spontaneous.

A spontaneous process is one in which we can proceed without additional input of energy releasing free energy and then moves to a lower more stable thermodynamical state.

Therefore, A reaction that requires energy would be spontaneous process. (option b)

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