valence electrons are electrons located group of answer choices in the innermost energy level of an atom. in the outermost energy level of an atom. in the nucleus of an atom. in the first three shells of an atom. throughout the atom.

Answer:

Propyne can be converted to the acetone when it is made to undergo the reaction with mercuric sulphate followed by hydrolysis and thus, resultant product, thus formed is acetone.

Explanation:

Answer:

first question: 16.5 sleps

second question: 1.50 moles

Explanation:

The structural feature that is characteristic of naturally occurring fats and could be used to make soap is the presence of a carboxylic acid (-COOH) group.

Naturally occurring fats and oils are composed of molecules called triglycerides, which consist of three fatty acid chains esterified to a glycerol molecule. Fatty acids are long-chain carboxylic acids that typically contain 12-24 carbon atoms.

The carboxylic acid group (-COOH) at the end of each fatty acid chain is the functional group that reacts with a strong base, such as sodium hydroxide (NaOH), to form soap through a process called saponification.

During saponification, the base breaks the ester bonds between the fatty acids and the glycerol molecule, producing glycerol and the sodium salt of the fatty acid, which is the soap. The carboxylic acid group of the fatty acid reacts with the base to form the salt, which is the active cleansing agent in soap.

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Answer:

Mechanical energy

Explanation:

Given that,

Potential energy of an object is given by :

P = mgh

The kinetic energy of an object is given by :

\(K=\dfrac{1}{2}mv^2\)

Where

m is mass

h is height

v is velocity of the object

The sum of potential and kinetic energy is equal to total energy or the mechanical energy.

Hence, if air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body is equal to mechanical energy.

Answer:

i belive the answer is A if it's not i am very sorry

Answer:

With no sunlight, photosynthesis would stop, but that would only kill some of the plants—there are some larger trees that can survive for decades without it. Within a few days, however, the temperatures would begin to drop, and any humans left on the planet's surface would die soon after.

Explanation:

With no sunlight, photosynthesis would stop, but that would only kill some of the plants—there are some larger trees that can survive for decades without it. Within a few days, however, the temperatures would begin to drop, and any humans left on the planet's surface would die soon after.

Answer:

Answer:

all but the value of work

Explanation:

there is mercy in rules and laws that is way we have a legal system

there is mercy between humans and animals that's why we have shelters, preserves and get clinics

there is mercy in the civilized and primitive like teaching people to read of gorillas sign language.

but no mercy in work value as they say world of business is a cut throat place.

Answer:

They have the same valency because chlorine gains one electron to be stable and hydrogen gains one electron to be stable

To make a buffer solution, you must use solutions of a weak acid and its conjugate base.

For example, if you wanted to make a buffer solution with a pH of 4.5, you would mix a solution of acetic acid (CH3COOH) and sodium acetate (CH3COONa).

The acetic acid is the weak acid and the sodium acetate is its conjugate base. The concentrations of the two solutions should be in a ratio of 1:1 in order to maintain the desired pH.

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Titan has a nitrogen-rich atmosphere primarily due to outgassing from its interior, the presence of methane, and the absence of oxygen.

Titan, the largest moon of Saturn, has a unique atmosphere that is rich in nitrogen. The reason for this nitrogen-rich atmosphere can be attributed to several factors.

Firstly, Titan's atmosphere is primarily composed of nitrogen gas (N2), similar to Earth's atmosphere. This nitrogen is believed to have originated from outgassing, which is the release of gases from Titan's interior. Just like volcanoes on Earth release gases into the atmosphere, Titan's interior also releases nitrogen gas.

Secondly, the presence of methane (CH4) in Titan's atmosphere plays a crucial role in maintaining its nitrogen-rich composition. Methane is constantly evaporating from Titan's lakes and seas, undergoing a cycle of evaporation, condensation, and precipitation. This cycle helps to regulate the atmospheric composition and prevents the nitrogen from being converted into other compounds.

Lastly, the lack of oxygen and the low temperatures on Titan prevent the nitrogen from being converted into other compounds. On Earth, nitrogen can combine with oxygen to form various compounds, but the absence of oxygen on Titan allows the nitrogen to accumulate over time.

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Nitrogen is the dominant component of Titan's atmosphere (making up about 98% of its composition), there are also other trace gases present, including methane, ethane, and other hydrocarbons. Titan, Saturn's largest moon, has a nitrogen-rich atmosphere for several reasons:

Primordial Composition: It is thought that the elements that makeup Titan's atmosphere are still present in the solar nebula, the gas and dust cloud from which the solar system emerged.

Lack of Geological Activity: Titan does not have any active volcanoes or tectonic plates, in contrast to Earth. There are no substantial mechanisms that can recycle or remove atmospheric nitrogen as a result of the absence of geological activity.

Low Temperatures: Titan has very low surface temperatures, with an average of about -290 degrees Fahrenheit (-179 degrees Celsius).

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Answer:

B.

Explanation:

Radioisotopes are radioactive isotopes of an element. They can also be defined as atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus.

A radioisotope describe as,

So, option B is correct one.

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The weight of silver sulfide that can be made from 1.23 mg of hydrogen sulfide (H2S) obtained from a rotten egg is 8.94mg.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions.

According to this question, silver reacts with hydrogen sulphide and oxygen to form silver sulphide and water as follows:

4Ag(s) + 2H₂S(g) + O₂(g) → 2Ag₂S(s) + 2H₂O(l)

Based on the above equation, 2 moles of hydrogen sulphide forms 2 moles of silver sulphide.

moles of hydrogen sulphide = 0.00123 gram ÷ 34.1 g/mol

moles = 3.607 × 10-⁵moles of H₂S, which is equivalent to 3.607 × 10-⁵moles of Ag₂S.

mass of Ag₂S = 247.8 g/mol × 3.607 × 10-⁵moles = 0.008938grams

Mass of silver sulphide = 8.94mg

Therefore, 8.94milligrams is the weight of silver sulphide.

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Answer: 3.156 * 10^7

Explanation: I do not really understand your question. You answered it yourself!

Scientific notation shortens large numbers. The number right after the decimal point can only be between 1 and 9, which you did correctly. When converting to scientific notation, the exponent of ten is based on how many places you moved the decimal and the direction you moved it (left, positive; right, negative). In this case, the exponent of ten is a positive seven.

You did everything correctly :) Good job!

Answer:

Inferring is when a scientist uses reasoning to explain or interpret the things they observe

The names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)

From the question,

We are to determine the how the name of CaS differ from the name of CdS

First, we will determine the identities of the elements in the given compounds

Ca represents calcium

and

S represents sulfur

∴ The compound is named Calcium sulfide

Cd represents the element Cadmium

and

S represent the element Sulfur

∴ The compound is named Cadmium sulfide

Hence, the names of the compounds differ by the type of metal present in them, which are Calcium (Ca) and Cadmium (Cd)

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The equipment used for filtering and collecting the apple juice includes a beaker containing some apple puree, a measuring cylinder, and filter paper.

To set up the apparatus, the filter paper is folded and placed into a filter funnel, which is then placed in a clean conical flask. The apple puree is then carefully poured into the funnel, and the juice that passes through the filter paper is collected in a measuring cylinder. A labelled diagram of the apparatus used to filter and collect the juice from the apple puree is shown below.

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Based on the periodic table, the element that is most reactive is Na.

The correct option is A.

Reactivity is a gauge of an element's propensity to create compounds with other elements. While certain elements require energy to react and are inert, others will do so simply and spontaneously. Reactivity is a gauge of an element's propensity to create compounds with other elements.

Reactive elements are the Group 1 and Group 2 metals. Also, the Group 17 and Group 16 non-metals are reactive non-metals.

Group 1 and Group 2 metals form positive ions easily by electron loss. Group 17 and Group 16 non-metals form negative ions by electron gain.

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Answer:

1) water usage (such as the withdrawal of water from streams and aquifers or the construction of dams and levees), land usage (such as urban development, agriculture, or the removal of wetlands), and pollution (such as of the air, water, or land)

2) global warming and climate change; water pollution and ocean acidification; and loss of biodiversity.

3) Raynaud’s phenomenon (also called Raynaud’s disease or Raynaud’s syndrome) is a disorder that affects the blood vessels in the fingers and toes. Blood vessels in the nose, lips or ear lobes may also be affected.

4) From the destruction of buildings to the spread of disease, natural disasters can devastate entire countries overnight. Tsunamis, earthquakes and typhoons do not just wreak havoc on land; they also disrupt people's lives in both densely populated cities and remote villages.

5) Climate change increases the risk of illness through increasing temperature, more frequent heavy rains and runoff, and the effects of storms. Health impacts may include gastrointestinal illness like diarrhea, effects on the body's nervous and respiratory systems, or liver and kidney damage.

6) Completely turn off equipment like televisions and stereos when you're not using them.

Choose energy-efficient appliances and light bulbs.

Save water: some simple steps can go a long way in saving water like, like turning off the tap when you are brushing your teeth or shaving. Try to collect the water used to wash vegetables and salad to water your houseplants. Changing our main energy sources to clean and renewable energy is the best way to stop using fossil fuels. These include technologies like solar, wind, wave, tidal and geothermal power. Switch to sustainable transport. Petrol and diesel vehicles, planes and ships use fossil fuels.

Explanation:

This was from my lecture notes. Stay safe!!

Answer:

B

Explanation:

B

Answer: The mass number tells the number of protons.

Explanation:

That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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If any combustion reaction generates 4.50 moles of carbon dioxide then the equivalant amount in grams will be 198 g (in 3 significant figures).

The molar mass of carbon dioxide (CO2) is qual to 44.01 g/mol.

In order to find the mass of 4.50 moles of CO2, we can use the following formula,

mass = number of moles × molar mass

Substituting the provided values, we will obtain,

mass = 4.50 mol × 44.01 g/mol

mass = 198.045 g

Therefore, after rounding to three significant figures, the mass of 4.50 moles of CO2 is obtaine to be 198 g.

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If any combustion reaction generates 4.50 moles of carbon dioxide then the equivalant amount in grams will be 198 g (in 3 significant figures).

The molar mass of carbon dioxide (CO2) is qual to 44.01 g/mol.

In order to find the mass of 4.50 moles of CO2, we can use the following formula,

mass = number of moles × molar mass

Substituting the provided values, we will obtain,

mass = 4.50 mol × 44.01 g/mol

mass = 198.045 g

Therefore, after rounding to three significant figures, the mass of 4.50 moles of CO2 is obtaine to be 198 g.

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Reason:- The Mechanism of Diffusion In the case of food coloring in water, the water is the solvent while the food coloring is the solute. Once they've mixed, they make a solution. Diffusion takes time, though how much time depends on the kinetic energy of the molecules randomly bouncing among each other.

The pH of the solution after the addition of 15.0 ml of KOH is 1.28.

In the given problem, we have been provided with the volume of HBr (hydrogen bromide) solution and its concentration.

We have been also provided with the concentration and volume of KOH (potassium hydroxide) solution.

We need to calculate the pH of the solution after the addition of 15.0 ml of KOH.

Let’s begin the calculation process-

1. Write down the balanced chemical equation of HBr and KOH-

HBr + KOH → KBr + H2O

2. To Calculate the number of moles of HBr-

We know that, Number of moles = Concentration x VolumeNumber of moles of HBr = 0.15 x 50/1000= 0.0075 moles of HBr

3. To Calculate the number of moles of KOH-

Number of moles of KOH = Concentration x VolumeNumber of moles of KOH = 0.25 x 15/1000= 0.00375 moles of KOH

4. To Calculate the number of moles of HBr left after the reaction-

Number of moles of HBr left = Number of moles of HBr – Number of moles of KOHNumber of moles of HBr left = 0.0075 - 0.00375= 0.00375 moles of HBr

5. To Calculate the concentration of HBr-

Concentration of HBr = Number of moles / VolumeConcentration of HBr = 0.00375 / 50/1000= 0.075 M

6. To Calculate the concentration of OH-

Number of moles of KOH = Concentration x Volume

Number of moles of KOH = 0.25 x 15/1000= 0.00375 moles of KOH

Concentration of KOH = Number of moles / Volume

Concentration of KOH = 0.00375 / 65/1000= 0.0577 M

Concentration of OH- = Concentration of KOH= 0.0577 M

7. To Calculate the concentration of H+

Using the formula of pH = -log[H+], we can get

[H+] = 10-pHLet pH = x[H+] = 10-x

From the balanced chemical equation, we know that 1 mole of HBr will give 1 mole of H+ and 1 mole of KOH will give 1 mole of OH-.

As the moles of KOH is less than the moles of HBr, KOH is the limiting reagent.

Now, using the formula of neutralization reaction, we can write-Volume of HBr x Concentration of HBr = Volume of KOH x Concentration of KOH50/1000 x 0.075 = 15/1000 x 0.0577Volume of HBr = 0.06 L

Now, H+ ion concentration can be calculated as-H+ ion concentration = KOH concentration – HBr concentration= 0.0577 – (0.075 x 0.015 / 0.06)= 0.0519 M

8. To Calculate pH of the solution-

We know that, pH = -log[H+]= -log(0.0519)= 1.28

Hence, the pH of the solution after the addition of 15.0 ml of KOH is 1.28.

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The pair that is a Brønsted–Lowry conjugate acid-base pair is NH3 and NH4+.

Acids are defined as proton donors in the Brønsted–Lowry theory, whereas bases are defined as proton acceptors. The Brønsted–Lowry theory is named after Johannes Nicolaus Brønsted and Thomas Martin Lowry, who established the idea of acids and bases as proton donors and acceptors respectively. When an acid donates a proton to a base, the acid is converted to its conjugate base, while the base becomes its conjugate acid. The pair that is a Brønsted–Lowry conjugate acid-base pair is NH3 and NH4+.

A conjugate acid-base pair is a pair of two molecules, one of which acts as an acid and the other as a base. They differ only in the presence or absence of a proton. Consider an example of acetic acid (CH3COOH) and its conjugate base acetate ion (CH3COO−). Acetic acid is an acid that donates a proton to a base, resulting in the formation of its conjugate base acetate ion, which can accept a proton to form acetic acid again. The Brønsted–Lowry conjugate acid-base pairs are defined as pairs of two species that differ only by the presence or absence of a proton.

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The density of the ball bearings at 20.0°C is 7.48 g/cm^3. This is calculated by determining the volume of ethanol that was added to the flask to top it off, subtracting that from the total volume of the flask, and then dividing the mass of the ball bearings by the resulting volume.

To calculate the density of the ball bearings, we first need to determine the volume of the ethanol that was added to the flask to top it off.

We can do this by subtracting the mass of the empty flask from the mass of the flask filled with ethanol and ball bearings, and then dividing that difference by the density of ethanol at 20.0°C:

Volume of ethanol added = (total mass - empty flask mass) / ethanol density

Volume of ethanol added = (81.604 g - 61.742 g) / 0.78945 g/cm^3

Volume of ethanol added = 25.112 cm^3

Next, we can calculate the total volume of the flask by adding the volume of the ethanol that was added to the volume of the empty flask:

Total volume of flask = volume of empty flask + volume of ethanol added

Total volume of flask = 50.000 cm^3 + 25.112 cm^3

Total volume of flask = 75.112 cm^3

Finally, we can calculate the density of the ball bearings by dividing their mass by the volume of the flask that is not occupied by the ethanol:

Density of ball bearings = ball bearing mass / (total flask volume - ethanol volume)

Density of ball bearings = 21.784 g / (75.112 cm^3 - 25.112 cm^3)

Density of ball bearings = 7.48 g/cm^3

Therefore, the density of the ball bearings at 20.0°C is 7.48 g/cm^3.

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To calculate the density of the ball bearings, subtract the mass of the empty flask from the total mass to find the mass of the ball bearings. Use the volume of the ethanol added to the flask, which is equal to the volume of the ball bearings, to calculate the density of the ball bearings.

To calculate the density of the ball bearings, we need to find their volume and mass. From the given information, we know that the total mass of the flask and ball bearings is 81.604 g. Since the mass of the empty flask is 61.742 g, the mass of the ball bearings can be calculated by subtracting the mass of the empty flask from the total mass:

Mass of ball bearings = Total mass - Mass of empty flask = 81.604 g - 61.742 g = 19.862 g

Now, let's find the volume of the ball bearings. The volume of the ethanol added to the flask is equal to the volume of the ball bearings. The volume of the ethanol can be calculated using its density and the mass of the ethanol added:

Volume of ethanol = Mass of ethanol / Density of ethanol = (81.604 g - 61.742 g) / 0.78945 g/cm³ = 25.212 cm³

Since the density of a substance is defined as its mass divided by its volume, we can now calculate the density of the ball bearings:

Density of ball bearings = Mass of ball bearings / Volume of ball bearings = 19.862 g / 25.212 cm³ = 0.788 g/cm³

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Answer:butterflies

Explanation:

Nah man you are on your own.

Answer:

Yes because

Explanation:

Answer:yes because the battery's electrical energy will make the wheels turn.

In an ecosystem, the coastal area  that is rotating toward the moon is the area where  tide rising to form a high tide.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .

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