Which of the following contribute(s) to most of the mass of an atom?
O A) Protons and electrons
B) Protons only
C) Protons and neutrons
OD) Neutrons only

Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.

In an endothermic reaction, the energy level increases as the reaction proceeds starting from the reactants and ending with the products.

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings in the form of heat. This heat is generally transferred from the surroundings to the reaction mixture, and as a result, the temperature of the mixture decreases. An endothermic reaction is often depicted with a positive change in enthalpy.

The reaction absorbs heat, and the energy of the system is increased. In the forward reaction, reactants absorb heat and increase in energy, which is manifested as an increase in the reaction vessel's temperature. The molecules then begin to vibrate more quickly and vigorously.

They then overcome the activation energy barrier and form the products.The enthalpy of the products is more than the enthalpy of the reactants, as energy was absorbed in the reaction. As a result, the energy level increases as the reaction proceeds starting from the reactants and ending with the products. Therefore, the correct option is 2) The energy level increases.

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Answer: If you add acid to a solution the concentration of hydrogen ions (acidity) increases and the pH decreases.

Explanation:

Answer:

The acidity of a solution increases with increasing concentration of hydrogen ions (H+). The concentration of H+ in a solution determines the pH of the solution, with lower pH values indicating a more acidic solution.

Explanation:

The sentence "Solvent use will not exceed 5,000 gallons per month" is the most preferable.

It is clear and direct, and avoids any ambiguity or confusion. With a word count of only 9 words, it is also concise and to the point. The other sentences could be interpreted in different ways, and may not convey the same level of certainty and clarity as the first option. Therefore, when communicating important information about solvent use, it is best to keep it simple and straightforward. The preferable sentence among the given options is: "Solvent use will not exceed 5,000 gallons per month." This sentence is clear, concise, and provides a specific limit for solvent usage. The other sentences are less direct or imply a different meaning, such as suggesting optimization or imposing restrictions only if the specified amount is needed. By stating that solvent use will not exceed a certain amount, it establishes a firm boundary and ensures that the intended message is effectively communicated.

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Answer:

\( \huge \color{indigo} \boxed{a. \: aldehyde}\)

Explanation:

Pentanal is considered to be a fatty aldehyde lipid molecule. These are compounds containing more than one aldehyde group. Pentanal is a very hydrophobic molecule, practically insoluble in water, and relatively neutral.

The lines in a line graph aid in the fairly early detection of trends, allowing the viewer to make predictions about the data that has not yet been recorded.These are appropriate for illustrating the data points since, given one variable, the other is simple to ascertain.

A line graph, often known as a line chart, is a visual representation of data that is continuously changing over time.

There are two axes. in a line graph, the occurrences and categories being compared throughout time are shown on the x-axis (abscissa), and the scale, which is a group of integers that reflects the data and is divided into equal intervals, is shown on the y-axis (ordinate).

Depending on the data, the graph's lines may either decline or ascend. It is practical to plot time graphs along the x/y axis since it shows the rise and fall of data points in great detail.

The reader may readily see changes in one group over time by choosing the appropriate scales for each axis (time on the x-axis and change is measured on the y-axis).

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The third quantum number of a 2s² electron in phosphorus, m = 0.

The correct option is D.

Quantum numbers are the set of numbers used to express the location and energy of an electron in an atom.

There are four types of quantum numbers;

The electronic configuration of phosphorus is 1s²2s²2p63s²3p³.

The third quantum number m has values of -l to +l.

For phosphorus, l is 0. Hence, m is also 0.

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Answer:

i got 12.1 as my answer hope it is right

The the volume that 0.540 mol of propane (C3H8) occupies at STP is 12.1 l.

Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected.

The molar volume (Vm) is the volume occupied by one mole of a chemical element or chemical compound at standard temperature and pressure (STP). You may figure it out by dividing the mass density () by the molar mass (M).

From the ideal gas law;  V = nRT/ P

where,

n = 0.540 mol

universal gas constant R = 8.314 J/mol·K

standard temperature T = 273.15 K

standard pressure P = 101 325 Pa

Substituting the values into the formula ;

= 0.540 × 8.314 × 273.15 / 101.325

= 0.0121 m³

= 12.1 l

Thus, The the volume that 0.540 mol of propane (C3H8) occupies at STP is 12.1 l.

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The correct statements that describe the procedure for drawing a Lewis structure are:

c. For a neutral molecule, the sum of the number of valence electrons for each atom gives the number of electrons used in the Lewis structure.

e. An electron is added to the total count for each negative charge on the species.

a. This assertion is untrue. If two atoms are joined by a bond, a single bond representing two electrons should be placed between them; however, not every pair of atoms in the Lewis structure must be linked by a connection.

b. This assertion is untrue. Since they increase the number of valence electrons and have an impact on the overall structure, nonbonding electrons, sometimes referred to as lone pairs, should be included in the Lewis structure.

d. This assertion is untrue. Halogen atoms are typically not positioned in the structure's center. The arrangement of formal charges of the atoms in a molecule and their overall electronegativity determine where they are placed in a Lewis structure.

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To draw a Lewis structure, you should place single bonds between atoms, include nonbonding electrons, and use the sum of the valence electrons for a neutral molecule.

The correct statements that describe the procedure for drawing a Lewis structure are:

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Answer:

Explanation:

Aliphatic compounds are those hydrocarbons that are the open chain compounds and also closed chains. Aromatic compounds are those who have only a closed chain structure. They can be saturated as well as unsaturated where the system can be open as well as closed chain.

In the given options, only option (b) has a nitrogen atom with three alkyl groups attached to it, and hence it is a tertiary amine

A tertiary amine can be defined as an organic molecule or functional group that has a nitrogen atom with three alkyl groups attached to it.

Based on this definition, the tertiary amine in the given options is option (b).

Explanation:

Given options:

(a) CH3​CH2​NHCH(CH3​)2​

(b) CH3​CH2​N(CH3​)2​

(c) (CH3​)3​CNH2​

(d) CH3​CH2​NHCH3

​Tertiary amine:

A tertiary amine can be defined as an organic molecule or functional group that has a nitrogen atom with three alkyl groups attached to it.

In the given options, only option (b) has a nitrogen atom with three alkyl groups attached to it, and hence it is a tertiary amine.

Hence, the correct option is b. CH3​CH2​ N(CH3​)2​.

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Answer:

14.8 g

Explanation:

step 1 You first have to convert the cm^3 to dm^3 by dividing the volume by 1000 then find the number of mols for Hydrogen gas

from there you can use the of moles for hydrogen to find the moles of the metal step 2

then step 3 you multiply the number of by The Mr or Fr giving you your mass

Answer:

b. the precision of the throws

Explanation:

When dealing with paper delivery homeowners are mainly concerned about the precision of the throws. They technically want the paper to land directly on their front door. Landing there, the paper will be protected from the rain and be visible for the homeowner to easily see it and pick it up in the morning when they wake up. Bad precision can lead the paper to fall into a puddle or on the grass where it will get wet and become useless or even end up breaking a window or other fragile items.

The estimated relative contribution of C3 plants is approximately 88%, while the estimated relative contribution of C4 plants is approximately 12% to the organic matter in Kenya's soil.

To determine the relative contribution of C3 and C4 plants to the organic matter in Kenya's soil, we can use the difference in stable carbon isotopic compositions (δ13C values) between these plant types.

C3 and C4 plants have distinct δ13C values due to differences in their carbon fixation pathways. C3 plants generally have δ13C values ranging from -22 to -33 permil, while C4 plants typically exhibit δ13C values from -9 to -16 permil.

Given that the stable carbon isotopic composition (δ13C) of the soil organic matter in Kenya is -18 permil, we can compare this value to the δ13C values of C3 and C4 plants to estimate their relative contributions.

Let's denote the relative contribution of C3 plants as "x" and the relative contribution of C4 plants as "y." Since the contributions of C3 and C4 plants sum up to 100%, we have the equation:

x + y = 100% (equation 1)

Now, let's assign the δ13C values to the contributions of C3 and C4 plants. Assuming the air δ13C value is -7 permil, we can write the following equations:

-18 = x * (-33) + y * (-16) + (-7) * (1 - x - y) (equation 2)

Solving equations 1 and 2 simultaneously will provide us with the relative contributions of C3 and C4 plants.

Using the given δ13C values and solving the equations, we find:

x ≈ 0.88 (or 88%)

y ≈ 0.12 (or 12%)

Therefore, the estimated relative contribution of C3 plants is approximately 88%, while the estimated relative contribution of C4 plants is approximately 12% to the organic matter in Kenya's soil.

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Answer:

the water in the mountains will take longer to boil, because of the higher atmospheric pressu

Filtration is the likely exception among these techniques for separating an organic mixture.

To identify the laboratory technique that is an exception and cannot be used to separate an organic mixture, we need to consider common separation methods used in organic chemistry. Here are some commonly used techniques for separating organic mixtures:

Distillation: This technique utilizes differences in boiling points to separate volatile components from a mixture.

Extraction: Involves the selective dissolution of one or more components in a suitable solvent.

Chromatography: Separates components based on their differential affinity to a stationary phase and a mobile phase.

Filtration: Uses a porous medium to separate solid particles from a liquid or gas.

Crystallization: Involves the formation of pure crystals from a saturated solution to separate a solid component.

The exception among these techniques is likely filtration. Filtration is primarily used to separate solid particles from a liquid or gas but may not be suitable for separating components in an organic mixture where all components are in a liquid or gas phase. Filtration is more commonly employed to separate solids from liquids or gases, rather than separating different liquid or gaseous components from each other.

Therefore, filtration is the likely exception among these techniques for separating an organic mixture.

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The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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In Rutherford's gold foil experiment, alpha particles were fired against a thin sheet of gold foil, and their scattering patterns were then recorded on a screen.

In Thomson's "plum custard" atom model, a positively charged "soup" was surrounded by negatively charged electrons. Rutherford's gold foil experiment proved that an atom is mostly empty space with a tiny, dense, positively-charged nucleus.

Because of Rutherford's discoveries, Thomson's plum pudding model was flawed. An atom's positive charge is not distributed uniformly. Instead, everything is gathered in the tiny nucleus. Except for the electrons that are dispersed across it, the remaining space in an atom is empty.

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Answer:wont

Explanation:

2.59  kilograms of water evaporate, if latent heat is lv.

Q = m lv = 3000 kCal / 2

m = 3000 / 2 lv

lv = 580 kCal /kg

m = 2.59 kg

Hence, 2.59  kilograms of water evaporate, if latent heat is lv.

The heat energy that has to be supplied to change the state of a substance without changing the temperature of the substance is called its latent heat.

Latent heat is the power launched or absorbed by means of a body whilst changing it nation with out upward thrust or fall in temperature . including greater warmness to the water has no impact on temperature. as a substitute, it causes the water to trade nation (or vaporize) from a liquid to a gasoline.

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Answer:

B

CuO

H2

Explanation:

hydrogen will oxidized to form water

Copper(II) oxide reacts with hydrogen.

\(CuO + H_2\) → \(Cu + H_2O\)

Oxidising agent - \(Cuo\)

Reducing agent - \(H_2\)

A chemical reaction that takes place between an oxidizing substance and a reducing substance.

The oxidizing substance loses electrons in the reaction, and the reducing substance gains electrons.

In the reaction  \(CuO + H_2\) → \(Cu + H_2O\)  

\(Cuo\) is the oxidising agent and  \(H_2\) is the reducing agent because \(Cuo\)  is oxidising  \(H_2\) and \(H_2\) is the reducing agent because it is removing oxygen from \(Cuo\).

Hence, option B is correct.

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Answer:

The average atomic mass of zinc is 65.38 u.

Explanation:

Hope this helps.

Give brainliest please!

Answer:

The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.

Explanation:

Answer:

Number of energy levels that the element has.

Explanation:

The period number (n) is the outer energy level that is occupied by electrons. The period number that an element is in, is the number of energy levels that the element has.

Answer:

Composition of matter

Answer: I think you're supposed to add the protons and neutrons and then that's your answer. Sorry if I'm wrong :/

Explanation: