What are sources of electricity? List as many as you can

Plz Help me plz

Answer:

the relation of two different forms of the same substance (such as two allotropic forms of tin) that have a definite transition point and can therefore change reversibly each into the other — compare monotropy.

the second options

the number of protons and electrons found in that element

The ΔHrxn for the neutralization reaction between aqueous NaOH and HCl is -994.6 kJ/mol HCl.

Given that A 100.0 mL sample of 0.255 M NaOH is mixed with a 100.0 mL sample of 0.200 M HCl in a coffee cup calorimeter.  Both solutions were initially at 20.00°C and the temperature of the resulting solution was recorded as 37.00°C.  

We are to determine the ΔHrxn (in units of kJ/mol HCl) for the neutralization reaction between aqueous NaOH and HCl.  The balanced chemical equation for the neutralization reaction between aqueous NaOH and HCl is

 NaOH (aq) + HCl (aq) → NaCl (aq) + H2O  

(l)First, we need to determine the limiting reactant. It is necessary to identify the limiting reactant in order to calculate the moles of HCl reacted in the reaction and use it to determine ΔHrxn.  

Limiting reagent is the reactant that will be completely used up first, stopping the reaction. The reactant that is not completely consumed is the excess reactant.

We can use the concept of Stoichiometry to identify the limiting reactant.  To determine the limiting reactant, we can use the following formula:  

Molarity (M) = moles of solute (mol) / liters of solution (L) For NaOH, molarity (M) = 0.255 M For HCl, molarity (M) = 0.200 M.

Let's calculate the moles of NaOH and HCl:

Moles of NaOH = Molarity (M) × Volume (L)Moles of NaOH = 0.255 M × 0.100 L = 0.0255 mol

Moles of HCl = Molarity (M) × Volume (L)

Moles of HCl = 0.200 M × 0.100 L = 0.0200 mol

As we can see, the number of moles of NaOH is more than the number of moles of HCl.   NaOH is present in excess, while HCl is limiting.

The amount of HCl determines how much NaOH reacts, so we will use the number of moles of HCl to determine ΔHrxn.Next, we can calculate the amount of heat absorbed by the reaction:

qrxn = – qcal where qrxn = heat absorbed by the reactionqcal

= heat released by the calorimeterqcal

= (mass of water + mass of calorimeter) × specific heat of water × ΔTqcal = (200.0 g + 50.0 g) × 4.184 J/g·°C × (37.00°C – 20.00°C)

= 19,892 J or 19.892 kJqrxn

= – 19.892 kJ  (because no heat is lost to the calorimeter or the surroundings)

Next, we can use the equation below to calculate ΔHrxn:ΔHrxn = qrxn / n ΔHrxn = -19.892 kJ / (0.0200 mol × (-1)) = 994.6 kJ/mol HCl (Negative sign indicates that the reaction is exothermic).

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Answer: The account of the prophet Daniel demonstrates to Jews that God will rescue them from harm because made the lions shut their mouths so that Daniel was safe through the night.

The mass (in grams) of lead that will plate out of the solution, given that 3.91 A is passed through the solution for 1.7 h is 25.66 g

First, we shall determine the charge flowing through the solution. This is shown below:

Q = It

Q = 3.91 × 6120

Q = 23929.2 C

Finally, we shall determine the mass of lead that will plate out of the solution. Details below:

Balanced equation

Pb²⁺ + 2e —> Pb

From the balanced equation above,

193000 C plated 207 g of lead

Therefore,

23929.2 C will plate = (23929.2 × 207) / 193000 = 25.66 g of lead

Thus, the mass of lead that  will plate out is 25.66 g

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Answer: physical

Explanation: water doesn't undergo chemical change when it melts and freezes, because either way frozen or not the molecules are the same. hope i helped ;] BRAINLYEST?????

Explanation:

Hypothesis is answer.

Have a great day

Answer:

bro please rotate it and send again please

The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer:

\(\huge\boxed{\sf n = 0.25\ moles}\)

Explanation:

Mass in g = m = 6.75 g

Molar mass of Al = M = 27 g/mol

No. of moles = n = ?

n = m / M

Put the given data in the above formula.

n = 6.75 / 27

\(\rule[225]{225}{2}\)

The answer responses to  the structures shown in the diagram are:

A. chromosomes

C. They would be the same.

B. They are in pairs because each one comes from a different parent.

The chromosomes are in pairs because humans have a diploid number of chromosomes, meaning they have two sets of chromosomes, one inherited from each parent.

The nucleus is important in eukaryotic cells and has many important parts that help the cell work properly. There are some parts inside cells called the nuclear membrane, nucleoplasm, nucleolus, and chromatin. Chromatin is made up of DNA and other proteins.

Every part of a person's body has the same genes, but the way they are organized can be different in different types of cells. The chromosomes in our skin cells might not be the same as the chromosomes in our muscle cells, even if they come from the same person.

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Identify the structures shown.

A. chromosomes

B. mitochondria

C. nuclei

D. vacuoles

C

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Explain why the structures are in pairs.

A. They aren't in pairs.

B. They are in pairs because each one comes from a different parent.

C. This cell is making a copy of itself.

D. The cell always has 2 copies in case 1 is damaged.

Answer:

heterogeneous mixture

Explanation:

because pizza has different phases I think

The type of mixture that pizza can be classified is Heterogeneous mixture

Therefore, heterogeneous mixture can be regarded as one having more than a substance.

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They are described as promissory notes that guarantee the unalienable rights of life, liberty, and the pursuit of happiness.

Claim 1 is that the Constitution and the Declaration of Independence give equal rights to all Americans. The evidence for this claim is found in the article of the Declaration of Independence.

Claim 2 is that America has failed to deliver these rights to black people. The evidence for this is found in the speech "I Have a Dream" by Martin Luther King Jr.

The Constitution and Declaration of Independence are described as promissory notes that guarantee the unalienable rights of life, liberty, and the pursuit of happiness.

Following are the Claims and Evidence:

Claim 1: All Americans, not only whites, are guaranteed equal rights under the Constitution and the Declaration of Independence.

The Declaration of Independence has supporting evidence for Claim 1.

Claim 2: The United States has failed to grant black people the rights outlined in the Constitution and Declaration of Independence.

Martin Luther King Jr.'s "I Have a Dream" speech serves as proof for Claim 2.

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last option is correct, (384.7 g/mol) * (1 mol/6.023*10^23). The smallest unit of a material, a molecule possesses both its physical and chemical characteristics. One or more atoms make up molecules.

Moles = Molecules/6.022*10^23

Mass = Moles * molar mass  

Mass = Molecules * molar mass / 6.023*10^23

Mass = (Molecules/6.023*10^23) * (384.7 g/mol)

Thus last option is correct.

(384.7 g/mol) * (1 mol/6.023*10^23)

Compound molecules include atoms from two or more distinct elements. As an illustration, the molecule of water (H2O) has three atoms: two hydrogen (H) atoms and one oxygen (O) atom. Common greenhouse gas methane (CH4) has five atoms: one carbon (C) and four hydrogen atoms (H, see Fig. 2.9). There are three different kinds of molecules: atom-sized molecules, element-sized molecules, and compound-sized molecules.

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The balanced equation for the reaction of guanidine with water is: (NH2)2CNH (aq) + H2O (l) ⇌ (NH2)2CNH2+ (aq) + OH- (aq).

The Kb expression for this reaction is: Kb = [OH-] [(NH2)2CNH2+] / [(NH2)2CNH]

In this reaction, guanidine acts as a Brønsted-Lowry base by accepting a proton from water to form the conjugate acid (NH2)2CNH2+ and the hydroxide ion (OH-).

The Kb expression reflects the equilibrium between the reactants and products, with the concentrations of the products in the numerator and the concentration of the base in the denominator.

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Answer:

C. Gases in the atmosphere prevent heat from escaping

Explanation:

Took one for the team and caught an L, C was the right answer

The greenhouse gases are known as the gases which absorb the infrared radiations and create greenhouse effect. Gases in the atmosphere prevent heat from escaping is the greenhouse effect. The correct option is C.

The process by which the radiations of the sun are absorbed by the green house gases and are not reflected back into the space is defined as the greenhouse effect. This insulates the earth and prevents it from freezing.

The green house effect increases the surface temperature of earth and also causes global warming.

Thus greenhouse effect is option C.

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Answer:

C it requires a specific glycoprotein for its absorption.

Out of the following statements concerning vitamin B12 the only statement which is correct- it requires a specific glycoprotein for its absorption.

Let's study some facts about vitamin B12:

⇒First, hydrochloric acid in the stomach separates vitamin B12 from the protein that it's attached to.

⇒Second, the freed vitamin B12 then combines with a protein made by the stomach, called intrinsic factor, and the body absorbs them together.

⇒intrinsic factor, transcobalamin (also known as transcobalamin II), and haptocorrin (also known as the R-protein or transcobalamin I).

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In a protein molecule, the number of amino acid molecules may be as few as d. 50.

Proteins are large macromolecules composed of chains of amino acids. These amino acids are linked together through peptide bonds to form the primary structure of a protein. The number of amino acids present in a protein molecule can vary greatly and depends on the specific protein.

Proteins can range in size from small peptides composed of just a few amino acids to large complex proteins containing thousands of amino acids. The minimum number of amino acids required for a protein to be considered functional is typically around 50. This is because proteins need a certain length and structural complexity to carry out their specific functions.

Proteins play vital roles in living organisms and are involved in various biological processes such as enzyme catalysis, cell signaling, structural support, and immune response. The specific number and sequence of amino acids in a protein molecule determine its unique structure and function.

Therefore, while some proteins may consist of as few as 50 amino acids, larger and more complex proteins can contain thousands of amino acids, enabling them to perform intricate and diverse functions within living systems. Therefore, Option D is correct.

The question was incomplete. find the full content below:

In a protein molecule, the number of amino acid molecules may be as few as

a. 5

b. 5,000

c. 500

d. 50

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Answer:

0.04 mole or 1.23 g

Explanation:

1 mole of P has 6.02 x 10^23 atoms

so quantity in moles of P of 2.40 x 10^22 atoms equal

1 mole x (2.40 x 10^22)/(6.02 x 10^23)

= 0.03986710963 or 0.04 mole

1 mole of P = 6.02 x 10^23 atoms = 30.97 g

2.40 x 10^22 atoms weights

(30.97)(2.40 x 10^22)/(6.02 x 10^23)

= 1.23468438538 or 1.23 g

Answer:

d. C6H14 > C6H12 > C6H6

Explanation:

Standard molar entropy has to do with the number of atoms that are present in each of the species. The greater the number of atoms possessed by the species, the higher the value of the standard molar entropy due to a greater number of vibration modes.

Hexane (C6H14) has the highest number of atoms followed by cyclohexane (C6H12) and lastly benzene (C6H6).

Thus the order of decreasing molar entropy is;  C6H14 > C6H12 > C6H6.

Answer:

A. 0.49 g/cm3

B. Yes

Explanation:

Volume of wood = 3 x 6 x 9 = 162 cm3

d = m/V = 80.0/162 = 0.49382716049 = 0.49 g/cm3

Since density of water is 1 g/cm3, density of wood is less so it will float in water.

Answer:

The pressure is = 897 torr

Explanation:

We use Gay Lussac's Law.

Answer:

Below in bold.

Explanation:

6 / 27 = 0.22222..

29.66 / 35.5 = 0.66648

Ratio of M to Cl is  1:6

Empirical formula = MCl3.

Atomic radii decreases  along a period and increases along a group in the periodic table.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

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 This should bring you to the periodic table Can i Please have Brainliest

Answer:

1. NaCl

2. NH4F

3. MgO

4.LiCl

5. KI

6. CaO

Explanation:

In that order