What is the difference between the mass number of an isotope and its atomic number?the number of isotopesthe number of protonsthe number of neutronsthe number of electrons

Answer:

True

Explanation:

Both work because an element would be pure and compounds can be split into elements. This will work unless the substance isnt chemcially pure, but in this case it is so the answer would be true.

This problem is providing the mass, specific heat and melting point of aluminum and the amount of heat it receives in a heating process so it asks for the change in its temperature, which results in 64.36 °C.

In chemistry, one can perform calorimetry calculations with the widely-known heat equation relating mass, specific heat, temperature and heat:

\(Q=mC\Delta T\)

Thus, when having 1250.0 g of aluminum at -35.0 °C and supplying 72.41 kJ (72,410 J) of heat, we will be able to solve for the change in temperature by solving for it in the previous formula:

\(\Delta T=\frac{Q}{mC} \\\\\Delta T=\frac{72,410J}{1250.0g*0.90\frac{J}{g\°C} } \\\\\Delta T=64.36\°C\)

Which is not as high as for it to provoke a melting change, with the correct significant figures as 0.90 do not contribute to this for being a theoretical number.

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The correct statement is option B - A redox reaction involves either the transfer of an electron or a change in oxidation state of an element.Redox reactions involve the transfer of electrons from one substance to another.

The term "redox" refers to the simultaneous oxidation and reduction of molecules in the reaction, with one molecule losing electrons and the other gaining electrons.

Redox reactions is:Oxidation: Loss of electronsReduction: Gain of electrons. A molecule or atom that loses electrons is said to be oxidized, while one that gains electrons is said to be reduced.

The oxidized substance is an oxidizing agent, while the reduced substance is a reducing agent.

The statement "A redox reaction involves either the transfer of an electron or a change in oxidation state of an element" is true as the redox reaction involves both reduction and oxidation reactions.

Any substance that is oxidized should be reduced by another substance, and vice versa. Thus, a redox reaction involves the transfer of electrons from one substance to another.

Although oxygen is often present in redox reactions, it is not a necessary component of them. So, the statement C is false, and oxidation can not occur independently of reduction, so the statement A is false too.

The reducing agent reduces another substance and is itself oxidized; thus, statement D is also true.

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Answer:

When  wood is burnt , it turns into ashes which is a new substance and process is irreversible one,( chemical change)

When wood is cut into smaller pieces (firewood) this is a physical change

Explanation:

Answer:

Yes very much so, especially gases

Explanation:

Solubility of gases decrease with increasing pressure. Be familiar with Henry's Law.

- Hope that helps! Please let me know if you need further explanation.

Answer:

Yes, it does.

Answer:

There are 7 carbons in 2,3 dimethylpentane

Explanation:

Because 2,3-dimethlypentane is an organic compound of carbon and hydrogen with formula C7H16

Answer:

2H2S + 3O2 --> 2H2O + 2SO2

2 mol H2S/8 mol H2O = 0.25 mol

Explanation:

Reactants: H is 2; S is 1; O is 2

Products: H is 2; S is 1; O is 3

There are 3 oxygens so add a 2 to the H2O e and 3 to the reactants side.

H2S + 3O2 → 2H2O + SO2

Reactant side: H is 2; S is 1; O is 6

Product side: H is 4; S is 1; O is 4

Hydrogen is now out of balance, so a coefficient of 2 can be placed in front of H2S to give:

2H2S + 3O2 → 2H2O + SO2

Reactant side: H is 4; S is 2; O is 6

Product side: H is 4; S is 1; O is 4

Sulfur is unbalanced, so a coefficient of 2 can be placed in front of SO2 to give:

2H2S + 3O2 → 2H2O + 2SO2

The α‑ketoacid or the α‑ carboxylic acid are the organic compounds that are the characterize the presence of a keto group at the position of α- in carboxylic acid functional group.

The common name of the α‑ketoacid resulting from the transamination of each amino acid is given as follows :

1) alanine + α‑ketoglutarate --->  pyruvate

2) aspartate + α‑ketoglutarate ----> oxaloacetate

3) glutamate + α‑ketoglutarate  ----->  α‑ketoglutarate

4) phenylalanine  + α‑ketoglutarate ------>   phenylpyruvate

5) tyrosine  + α‑ketoglutarate  ----->  p - hydroxyphenyl pyruvate

The amino acids are the organic compounds which contain both the groups the amino acid and the carboxylic acid groups.

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Answer:

B- shield

Explanation:

C IS NOT CORRECT.

Edge 2022 ;)

Answer: B shield

Explanation:

The maximum mass of lead that can be obtained by the reaction of 57.33 g PbO and 33.80 g of PbS is 58.4 g.

To answer this question, we need to use the balanced chemical equation for the reaction between lead (II) oxide (PbO) and lead (II) sulfide (PbS):

PbO + PbS → 2Pb + SO\(^{2}\)

According to the equation, one mole of PbO reacts with one mole of PbS to produce two moles of lead (Pb) and one mole of sulfur dioxide (SO\(^{2}\)). We can use this information to calculate the theoretical yield of lead from the given amounts of PbO and PbS.

First, we need to convert the masses of PbO and PbS to moles. The molar mass of PbO is 223.20 g/mol, so 57.33 g PbO is equal to 0.257 mol. The molar mass of PbS is 239.27 g/mol, so 33.80 g PbS is equal to 0.141 mol.

Next, we need to determine which reactant is limiting, i.e. which one will be completely consumed in the reaction. We can do this by calculating the number of moles of each reactant needed to produce the same amount of product. Since the ratio of PbO to PbS in the balanced equation is 1:1, we can compare the number of moles of each:

- PbO: 0.257 mol × (1 mol Pb / 1 mol PbO) = 0.257 mol Pb
- PbS: 0.141 mol × (1 mol Pb / 1 mol PbS) = 0.141 mol Pb

Since PbS is the limiting reactant (i.e. there is less of it than PbO), we will use its moles to calculate the theoretical yield of lead.

According to the equation, 1 mole of PbS produces 2 moles of Pb, so:

0.141 mol PbS × (2 mol Pb / 1 mol PbS) = 0.282 mol Pb

Finally, we can convert the moles of Pb to grams using the molar mass of Pb, which is 207.2 g/mol:

0.282 mol Pb × (207.2 g Pb / 1 mol Pb) = 58.4 g Pb

Therefore, 58.4 g is the maximum mass of lead that can be obtained by the reaction of 57.33 g PbO and 33.80 g PbS.

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When the air inside the balloon is heated, the molecules in the air begin to move around and spread out, and the air becomes less dense.

When the air inside the balloon is heated, the molecules in the air begin to move around and spread out, and the air becomes less dense. The surrounding, colder air falls beneath the hot air. This forces the warm air upward, which pushes the balloon up with it. The moving warm air creates a convection current.

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The jejunum region of the small intestine is where one would expect to find the highest concentration of dipeptides after protein and polypeptide hydrolysis by proteases.

The most dipeptides would be expected to be found in the small intestine, specifically in the region known as the jejunum.

After proteins and polypeptides are hydrolyzed by proteases, such as pepsin in the stomach and pancreatic enzymes (trypsin, chymotrypsin, and carboxypeptidases) in the small intestine, the resulting products are primarily dipeptides, tripeptides, and amino acids.

As the partially digested food moves from the stomach to the small intestine, further enzymatic digestion occurs in the lumen of the small intestine. The majority of enzymatic activity and absorption of nutrients take place in the jejunum, which is the middle section of the small intestine.

In the jejunum, dipeptides, which are two amino acids linked together, are further broken down by enzymes known as peptidases or dipeptidases. These enzymes hydrolyze dipeptides into individual amino acids, which can then be absorbed through the intestinal lining into the bloodstream for further utilization by the body.

Therefore, the jejunum region of the small intestine is where one would expect to find the highest concentration of dipeptides after protein and polypeptide hydrolysis by proteases.

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Answer:

Covalent bonds

Explanation:

they go together with water molecules

Pauli Exclusion Principle is about quantum numbers of an atom. Hund rule is about how electrons are filled to the orbitals of an atom.

Answer:

charges on the drops were all integer multiples of a fundamental unit of charge.

Answer:

I tried my best lol, but here's what I put. I hope this helped a bit

The graph of the voltage on the x-axis and the average number of paper clips picked up by the electromagnet on the y-axis is shown in the picture attached.

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

It usually consist of wire wound into a coil. When current is passed through the wire a magnetic field is created which is concentrated in the hole, denoting the center of the coil.

The Battery voltage was plotted on the x axis and the average paper clips picked up by 25 turn electromagnet and 50 turn electromagnet was plotted on y axis and the following graph was obtained.

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Answer:

if bees have a choice between red and yellow flowers, then they will prefer the red flowers.

Explanation:

this is because red flowers have a very intense attractive brightening appears the makes it very visible to the bee and also, red flowers produce more nectar

Answer: Love is when you feel like you can touch the sky when your around that person, when your at your best self or that person and when you put their needs before yours because your needs just don't matter. When you feel like you can't stop thinking about that person or you can stop smiling when you think of them. Its when you feel this warm, safe feeling when your around them. And if you really love them then my answer should be true for you.

Explanation:

because iv'e felt and have been in love before....

Answer:

Love is an intense, deep affection for another person. Love also means to feel this intense affection for someone. Love can also refer to a strong like for something or to like something a lot. Love has many other senses both as a verb and a noun

Based on the description of the graph, the law that is based on it is A. Boyle's law.

Boyle's law states that, at a constant temperature, the pressure and volume of a gas are inversely proportional to each other. In other words, as the volume of a gas decreases, the pressure increases, and vice versa, when the temperature remains constant.

The graph described shows a curve that starts high on the horizontal axis (indicating a large volume) and curves toward the origin, indicating a decrease in volume. As the volume decreases, according to Boyle's law, the pressure of the gas would increase. The leveling out of the curve as it approaches the horizontal axis suggests that there is an equilibrium point where the pressure and volume have stabilized.

Therefore, the graph aligns with the behavior predicted by Boyle's law, which establishes the inverse relationship between pressure and volume for a given amount of gas at a constant temperature. Therefore, Option A is correct.

The question was incomplete. find the full content below:

Which law is based on the graph that is shown below?

A graph is shown with pressure on the horizontal axis and volume on the vertical axis. A curve starts high on the horizontal axis, curves toward the origin, and then starts to level out as it approaches the horizontal axis.

A. Boyle’s law

B. Charles’s law

C. Dalton’s law

D. Gay-Lussac’s law

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Energy consumption in the cloud refers to the amount of energy used by data centers and other infrastructure that provide cloud computing services.

This includes the energy used to power servers, cooling systems, and networking equipment, as well as the energy used to transport data over networks.

As cloud computing has become increasingly popular, energy consumption has become a significant concern for both cloud providers and users, as the energy required to run data centers can be substantial. To mitigate this, cloud providers are investing in more energy-efficient technologies and practices, such as using renewable energy sources and implementing more efficient cooling systems.

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The given net reaction, "H + OH → H2O," is best described as a neutralization reaction, specifically the combination of a hydrogen ion (H+) and a hydroxide ion (OH-) to form water (H2O).

The net reaction, "H + OH → H2O," represents a neutralization reaction. In this reaction, a hydrogen ion (H+) combines with a hydroxide ion (OH-) to form water (H2O). This reaction is commonly observed in acid-base chemistry, where an acid and a base react to neutralize each other and produce water as the resulting product. The hydrogen ion (H+) is derived from an acid, which is a substance that donates protons (H+) in a solution. The hydroxide ion (OH-) is derived from a base, which is a substance that accepts protons (H+) in a solution.

When these two ions combine, they form a water molecule (H2O), which is electrically neutral. Neutralization reactions are important in maintaining pH balance and regulating acidity in various chemical and biological systems. They play a crucial role in many areas, including chemistry, biology, and environmental science.

What is the best description for the net reaction H + OH → H2O?

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Answer:

Reaction is already balanced

Explanation:

The equation in reaction 1 is given as;

CH3COOH + NaHCO3 --> CO2 + H2O +  Na+   +  CH3COO-

The reaction is already balanced. This is because the umber of atoms of elements in the reactant is equal to that of the products

Carbon

Reactant = 2 + 1 = 3

Product = 2 + 2 = 3

Hydrogen

Reactant = 3 + 1 + 1 = 5

Product = 2 + 3 = 5

Oxygen

Reactant = 2 + 3 = 5

Product = 2 +1 + 2 = 5

Sodium

Reactant = 1

Product = 1

Answer:

The reaction is already balanced because the number of atoms in the reactant is equal to the products

Explanation:

a. The chemical reaction can be rewritten as a word equation as follows:

Hydrogen Peroxide -> Oxygen + Water

b. Evidence that a chemical reaction has occurred includes the production of a new substance (oxygen and water), a change in the physical properties of the reactants (change in color, odor, or temperature), and the release of energy (evolution of oxygen gas).

c. The reaction is likely exothermic, which means it releases energy. This is because the reaction produces new substances (oxygen and water) and releases energy in the form of oxygen gas. In an endothermic reaction, the reactants would absorb energy from the surroundings.

The products would you expect to isolate and which, if any, would predominate from dehydrate 3-methycylohexanol, are 2-methylcyclohexanol .

The dehydration of 2-methylcyclohexanol proceeds thru an E1 elimination. The acid catalyst protonates the hydroxy organization changing it into an excellent leaving organization, a impartial molecule of water. The water departs on its own, producing a carbocation, which fast gets rid of a beta-proton to shape a double bond 3-methylcyclopentene.

The dehydration of 3-methylcyclopentanol will provide 3-methylcyclopentene. The dehydration of 2-methylcyclohexanol offers alkene products, 1-methylcyclohexene and 3-methylcyclohexene. According to Zaitsev's rule the maximum substituted alkene (1-methylcyclohexene) is the predominant product.

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Answer:

Human exhale

Explanation:

When humans exhale-carbon is that which all humans produce=18% of all carbon output

Answer:

1)Oxygen atoms have 8 electrons and the shell structure is 2.6. The ground state electron configuration of ground state gaseous neutral oxygen is [He]. 2s2. 2p4 and the term symbol is 3P2.

Explanation:

2)If the element were to become excited, the electron could occupy an infinite number of orbitals. However, in most texts the example will be the next available one. So for oxygen, it might look like this: 1s22s22p33s1 - where the valence electron now occupies the 3s orbital in an excited (i.e. not ground) state

The solution with the highest pH is option C, 0.1 M NaOH.

Sodium hydroxide, also known as lye and caustic soda is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na⁺ and hydroxide anions OH⁻.

Sodium hydroxide is a highly corrosive base and alkali that decomposes proteins at ordinary ambient temperatures and may cause severe chemical burns. It is highly soluble in water, and readily absorbs moisture and carbon dioxide from the air. The commercially available "sodium hydroxide" is often this monohydrate, and published data may refer to it instead of the anhydrous compound.

NaOH is a strong base and will completely dissociate in water, releasing hydroxide ions which will increase the pH of the solution. The pH of 0.1 M NaOH is around 13, which is the highest pH value among the options given.

So, The solution with the highest pH is option C, 0.1 M NaOH.

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